1 /* 2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 // no precompiled headers 26 #include "classfile/classLoader.hpp" 27 #include "classfile/systemDictionary.hpp" 28 #include "classfile/vmSymbols.hpp" 29 #include "code/icBuffer.hpp" 30 #include "code/vtableStubs.hpp" 31 #include "compiler/compileBroker.hpp" 32 #include "compiler/disassembler.hpp" 33 #include "interpreter/interpreter.hpp" 34 #include "jvm_solaris.h" 35 #include "memory/allocation.inline.hpp" 36 #include "memory/filemap.hpp" 37 #include "mutex_solaris.inline.hpp" 38 #include "oops/oop.inline.hpp" 39 #include "os_share_solaris.hpp" 40 #include "prims/jniFastGetField.hpp" 41 #include "prims/jvm.h" 42 #include "prims/jvm_misc.hpp" 43 #include "runtime/arguments.hpp" 44 #include "runtime/extendedPC.hpp" 45 #include "runtime/globals.hpp" 46 #include "runtime/interfaceSupport.hpp" 47 #include "runtime/java.hpp" 48 #include "runtime/javaCalls.hpp" 49 #include "runtime/mutexLocker.hpp" 50 #include "runtime/objectMonitor.hpp" 51 #include "runtime/osThread.hpp" 52 #include "runtime/perfMemory.hpp" 53 #include "runtime/sharedRuntime.hpp" 54 #include "runtime/statSampler.hpp" 55 #include "runtime/stubRoutines.hpp" 56 #include "runtime/thread.inline.hpp" 57 #include "runtime/threadCritical.hpp" 58 #include "runtime/timer.hpp" 59 #include "services/attachListener.hpp" 60 #include "services/memTracker.hpp" 61 #include "services/runtimeService.hpp" 62 #include "utilities/decoder.hpp" 63 #include "utilities/defaultStream.hpp" 64 #include "utilities/events.hpp" 65 #include "utilities/growableArray.hpp" 66 #include "utilities/vmError.hpp" 67 68 // put OS-includes here 69 # include <dlfcn.h> 70 # include <errno.h> 71 # include <exception> 72 # include <link.h> 73 # include <poll.h> 74 # include <pthread.h> 75 # include <pwd.h> 76 # include <schedctl.h> 77 # include <setjmp.h> 78 # include <signal.h> 79 # include <stdio.h> 80 # include <alloca.h> 81 # include <sys/filio.h> 82 # include <sys/ipc.h> 83 # include <sys/lwp.h> 84 # include <sys/machelf.h> // for elf Sym structure used by dladdr1 85 # include <sys/mman.h> 86 # include <sys/processor.h> 87 # include <sys/procset.h> 88 # include <sys/pset.h> 89 # include <sys/resource.h> 90 # include <sys/shm.h> 91 # include <sys/socket.h> 92 # include <sys/stat.h> 93 # include <sys/systeminfo.h> 94 # include <sys/time.h> 95 # include <sys/times.h> 96 # include <sys/types.h> 97 # include <sys/wait.h> 98 # include <sys/utsname.h> 99 # include <thread.h> 100 # include <unistd.h> 101 # include <sys/priocntl.h> 102 # include <sys/rtpriocntl.h> 103 # include <sys/tspriocntl.h> 104 # include <sys/iapriocntl.h> 105 # include <sys/fxpriocntl.h> 106 # include <sys/loadavg.h> 107 # include <string.h> 108 # include <stdio.h> 109 110 # define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later 111 # include <sys/procfs.h> // see comment in <sys/procfs.h> 112 113 #define MAX_PATH (2 * K) 114 115 // for timer info max values which include all bits 116 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) 117 118 119 // Here are some liblgrp types from sys/lgrp_user.h to be able to 120 // compile on older systems without this header file. 121 122 #ifndef MADV_ACCESS_LWP 123 # define MADV_ACCESS_LWP 7 /* next LWP to access heavily */ 124 #endif 125 #ifndef MADV_ACCESS_MANY 126 # define MADV_ACCESS_MANY 8 /* many processes to access heavily */ 127 #endif 128 129 #ifndef LGRP_RSRC_CPU 130 # define LGRP_RSRC_CPU 0 /* CPU resources */ 131 #endif 132 #ifndef LGRP_RSRC_MEM 133 # define LGRP_RSRC_MEM 1 /* memory resources */ 134 #endif 135 136 // see thr_setprio(3T) for the basis of these numbers 137 #define MinimumPriority 0 138 #define NormalPriority 64 139 #define MaximumPriority 127 140 141 // Values for ThreadPriorityPolicy == 1 142 int prio_policy1[CriticalPriority+1] = { 143 -99999, 0, 16, 32, 48, 64, 144 80, 96, 112, 124, 127, 127 }; 145 146 // System parameters used internally 147 static clock_t clock_tics_per_sec = 100; 148 149 // Track if we have called enable_extended_FILE_stdio (on Solaris 10u4+) 150 static bool enabled_extended_FILE_stdio = false; 151 152 // For diagnostics to print a message once. see run_periodic_checks 153 static bool check_addr0_done = false; 154 static sigset_t check_signal_done; 155 static bool check_signals = true; 156 157 address os::Solaris::handler_start; // start pc of thr_sighndlrinfo 158 address os::Solaris::handler_end; // end pc of thr_sighndlrinfo 159 160 address os::Solaris::_main_stack_base = NULL; // 4352906 workaround 161 162 163 // "default" initializers for missing libc APIs 164 extern "C" { 165 static int lwp_mutex_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; } 166 static int lwp_mutex_destroy(mutex_t *mx) { return 0; } 167 168 static int lwp_cond_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; } 169 static int lwp_cond_destroy(cond_t *cv) { return 0; } 170 } 171 172 // "default" initializers for pthread-based synchronization 173 extern "C" { 174 static int pthread_mutex_default_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; } 175 static int pthread_cond_default_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; } 176 } 177 178 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time); 179 180 // Thread Local Storage 181 // This is common to all Solaris platforms so it is defined here, 182 // in this common file. 183 // The declarations are in the os_cpu threadLS*.hpp files. 184 // 185 // Static member initialization for TLS 186 Thread* ThreadLocalStorage::_get_thread_cache[ThreadLocalStorage::_pd_cache_size] = {NULL}; 187 188 #ifndef PRODUCT 189 #define _PCT(n,d) ((100.0*(double)(n))/(double)(d)) 190 191 int ThreadLocalStorage::_tcacheHit = 0; 192 int ThreadLocalStorage::_tcacheMiss = 0; 193 194 void ThreadLocalStorage::print_statistics() { 195 int total = _tcacheMiss+_tcacheHit; 196 tty->print_cr("Thread cache hits %d misses %d total %d percent %f\n", 197 _tcacheHit, _tcacheMiss, total, _PCT(_tcacheHit, total)); 198 } 199 #undef _PCT 200 #endif // PRODUCT 201 202 Thread* ThreadLocalStorage::get_thread_via_cache_slowly(uintptr_t raw_id, 203 int index) { 204 Thread *thread = get_thread_slow(); 205 if (thread != NULL) { 206 address sp = os::current_stack_pointer(); 207 guarantee(thread->_stack_base == NULL || 208 (sp <= thread->_stack_base && 209 sp >= thread->_stack_base - thread->_stack_size) || 210 is_error_reported(), 211 "sp must be inside of selected thread stack"); 212 213 thread->set_self_raw_id(raw_id); // mark for quick retrieval 214 _get_thread_cache[ index ] = thread; 215 } 216 return thread; 217 } 218 219 220 static const double all_zero[ sizeof(Thread) / sizeof(double) + 1 ] = {0}; 221 #define NO_CACHED_THREAD ((Thread*)all_zero) 222 223 void ThreadLocalStorage::pd_set_thread(Thread* thread) { 224 225 // Store the new value before updating the cache to prevent a race 226 // between get_thread_via_cache_slowly() and this store operation. 227 os::thread_local_storage_at_put(ThreadLocalStorage::thread_index(), thread); 228 229 // Update thread cache with new thread if setting on thread create, 230 // or NO_CACHED_THREAD (zeroed) thread if resetting thread on exit. 231 uintptr_t raw = pd_raw_thread_id(); 232 int ix = pd_cache_index(raw); 233 _get_thread_cache[ix] = thread == NULL ? NO_CACHED_THREAD : thread; 234 } 235 236 void ThreadLocalStorage::pd_init() { 237 for (int i = 0; i < _pd_cache_size; i++) { 238 _get_thread_cache[i] = NO_CACHED_THREAD; 239 } 240 } 241 242 // Invalidate all the caches (happens to be the same as pd_init). 243 void ThreadLocalStorage::pd_invalidate_all() { pd_init(); } 244 245 #undef NO_CACHED_THREAD 246 247 // END Thread Local Storage 248 249 static inline size_t adjust_stack_size(address base, size_t size) { 250 if ((ssize_t)size < 0) { 251 // 4759953: Compensate for ridiculous stack size. 252 size = max_intx; 253 } 254 if (size > (size_t)base) { 255 // 4812466: Make sure size doesn't allow the stack to wrap the address space. 256 size = (size_t)base; 257 } 258 return size; 259 } 260 261 static inline stack_t get_stack_info() { 262 stack_t st; 263 int retval = thr_stksegment(&st); 264 st.ss_size = adjust_stack_size((address)st.ss_sp, st.ss_size); 265 assert(retval == 0, "incorrect return value from thr_stksegment"); 266 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned"); 267 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned"); 268 return st; 269 } 270 271 address os::current_stack_base() { 272 int r = thr_main() ; 273 guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ; 274 bool is_primordial_thread = r; 275 276 // Workaround 4352906, avoid calls to thr_stksegment by 277 // thr_main after the first one (it looks like we trash 278 // some data, causing the value for ss_sp to be incorrect). 279 if (!is_primordial_thread || os::Solaris::_main_stack_base == NULL) { 280 stack_t st = get_stack_info(); 281 if (is_primordial_thread) { 282 // cache initial value of stack base 283 os::Solaris::_main_stack_base = (address)st.ss_sp; 284 } 285 return (address)st.ss_sp; 286 } else { 287 guarantee(os::Solaris::_main_stack_base != NULL, "Attempt to use null cached stack base"); 288 return os::Solaris::_main_stack_base; 289 } 290 } 291 292 size_t os::current_stack_size() { 293 size_t size; 294 295 int r = thr_main() ; 296 guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ; 297 if(!r) { 298 size = get_stack_info().ss_size; 299 } else { 300 struct rlimit limits; 301 getrlimit(RLIMIT_STACK, &limits); 302 size = adjust_stack_size(os::Solaris::_main_stack_base, (size_t)limits.rlim_cur); 303 } 304 // base may not be page aligned 305 address base = current_stack_base(); 306 address bottom = (address)align_size_up((intptr_t)(base - size), os::vm_page_size());; 307 return (size_t)(base - bottom); 308 } 309 310 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 311 return localtime_r(clock, res); 312 } 313 314 // interruptible infrastructure 315 316 // setup_interruptible saves the thread state before going into an 317 // interruptible system call. 318 // The saved state is used to restore the thread to 319 // its former state whether or not an interrupt is received. 320 // Used by classloader os::read 321 // os::restartable_read calls skip this layer and stay in _thread_in_native 322 323 void os::Solaris::setup_interruptible(JavaThread* thread) { 324 325 JavaThreadState thread_state = thread->thread_state(); 326 327 assert(thread_state != _thread_blocked, "Coming from the wrong thread"); 328 assert(thread_state != _thread_in_native, "Native threads skip setup_interruptible"); 329 OSThread* osthread = thread->osthread(); 330 osthread->set_saved_interrupt_thread_state(thread_state); 331 thread->frame_anchor()->make_walkable(thread); 332 ThreadStateTransition::transition(thread, thread_state, _thread_blocked); 333 } 334 335 // Version of setup_interruptible() for threads that are already in 336 // _thread_blocked. Used by os_sleep(). 337 void os::Solaris::setup_interruptible_already_blocked(JavaThread* thread) { 338 thread->frame_anchor()->make_walkable(thread); 339 } 340 341 JavaThread* os::Solaris::setup_interruptible() { 342 JavaThread* thread = (JavaThread*)ThreadLocalStorage::thread(); 343 setup_interruptible(thread); 344 return thread; 345 } 346 347 void os::Solaris::try_enable_extended_io() { 348 typedef int (*enable_extended_FILE_stdio_t)(int, int); 349 350 if (!UseExtendedFileIO) { 351 return; 352 } 353 354 enable_extended_FILE_stdio_t enabler = 355 (enable_extended_FILE_stdio_t) dlsym(RTLD_DEFAULT, 356 "enable_extended_FILE_stdio"); 357 if (enabler) { 358 enabler(-1, -1); 359 } 360 } 361 362 363 #ifdef ASSERT 364 365 JavaThread* os::Solaris::setup_interruptible_native() { 366 JavaThread* thread = (JavaThread*)ThreadLocalStorage::thread(); 367 JavaThreadState thread_state = thread->thread_state(); 368 assert(thread_state == _thread_in_native, "Assumed thread_in_native"); 369 return thread; 370 } 371 372 void os::Solaris::cleanup_interruptible_native(JavaThread* thread) { 373 JavaThreadState thread_state = thread->thread_state(); 374 assert(thread_state == _thread_in_native, "Assumed thread_in_native"); 375 } 376 #endif 377 378 // cleanup_interruptible reverses the effects of setup_interruptible 379 // setup_interruptible_already_blocked() does not need any cleanup. 380 381 void os::Solaris::cleanup_interruptible(JavaThread* thread) { 382 OSThread* osthread = thread->osthread(); 383 384 ThreadStateTransition::transition(thread, _thread_blocked, osthread->saved_interrupt_thread_state()); 385 } 386 387 // I/O interruption related counters called in _INTERRUPTIBLE 388 389 void os::Solaris::bump_interrupted_before_count() { 390 RuntimeService::record_interrupted_before_count(); 391 } 392 393 void os::Solaris::bump_interrupted_during_count() { 394 RuntimeService::record_interrupted_during_count(); 395 } 396 397 static int _processors_online = 0; 398 399 jint os::Solaris::_os_thread_limit = 0; 400 volatile jint os::Solaris::_os_thread_count = 0; 401 402 julong os::available_memory() { 403 return Solaris::available_memory(); 404 } 405 406 julong os::Solaris::available_memory() { 407 return (julong)sysconf(_SC_AVPHYS_PAGES) * os::vm_page_size(); 408 } 409 410 julong os::Solaris::_physical_memory = 0; 411 412 julong os::physical_memory() { 413 return Solaris::physical_memory(); 414 } 415 416 static hrtime_t first_hrtime = 0; 417 static const hrtime_t hrtime_hz = 1000*1000*1000; 418 const int LOCK_BUSY = 1; 419 const int LOCK_FREE = 0; 420 const int LOCK_INVALID = -1; 421 static volatile hrtime_t max_hrtime = 0; 422 static volatile int max_hrtime_lock = LOCK_FREE; // Update counter with LSB as lock-in-progress 423 424 425 void os::Solaris::initialize_system_info() { 426 set_processor_count(sysconf(_SC_NPROCESSORS_CONF)); 427 _processors_online = sysconf (_SC_NPROCESSORS_ONLN); 428 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) * (julong)sysconf(_SC_PAGESIZE); 429 } 430 431 int os::active_processor_count() { 432 int online_cpus = sysconf(_SC_NPROCESSORS_ONLN); 433 pid_t pid = getpid(); 434 psetid_t pset = PS_NONE; 435 // Are we running in a processor set or is there any processor set around? 436 if (pset_bind(PS_QUERY, P_PID, pid, &pset) == 0) { 437 uint_t pset_cpus; 438 // Query the number of cpus available to us. 439 if (pset_info(pset, NULL, &pset_cpus, NULL) == 0) { 440 assert(pset_cpus > 0 && pset_cpus <= online_cpus, "sanity check"); 441 _processors_online = pset_cpus; 442 return pset_cpus; 443 } 444 } 445 // Otherwise return number of online cpus 446 return online_cpus; 447 } 448 449 static bool find_processors_in_pset(psetid_t pset, 450 processorid_t** id_array, 451 uint_t* id_length) { 452 bool result = false; 453 // Find the number of processors in the processor set. 454 if (pset_info(pset, NULL, id_length, NULL) == 0) { 455 // Make up an array to hold their ids. 456 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal); 457 // Fill in the array with their processor ids. 458 if (pset_info(pset, NULL, id_length, *id_array) == 0) { 459 result = true; 460 } 461 } 462 return result; 463 } 464 465 // Callers of find_processors_online() must tolerate imprecise results -- 466 // the system configuration can change asynchronously because of DR 467 // or explicit psradm operations. 468 // 469 // We also need to take care that the loop (below) terminates as the 470 // number of processors online can change between the _SC_NPROCESSORS_ONLN 471 // request and the loop that builds the list of processor ids. Unfortunately 472 // there's no reliable way to determine the maximum valid processor id, 473 // so we use a manifest constant, MAX_PROCESSOR_ID, instead. See p_online 474 // man pages, which claim the processor id set is "sparse, but 475 // not too sparse". MAX_PROCESSOR_ID is used to ensure that we eventually 476 // exit the loop. 477 // 478 // In the future we'll be able to use sysconf(_SC_CPUID_MAX), but that's 479 // not available on S8.0. 480 481 static bool find_processors_online(processorid_t** id_array, 482 uint* id_length) { 483 const processorid_t MAX_PROCESSOR_ID = 100000 ; 484 // Find the number of processors online. 485 *id_length = sysconf(_SC_NPROCESSORS_ONLN); 486 // Make up an array to hold their ids. 487 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal); 488 // Processors need not be numbered consecutively. 489 long found = 0; 490 processorid_t next = 0; 491 while (found < *id_length && next < MAX_PROCESSOR_ID) { 492 processor_info_t info; 493 if (processor_info(next, &info) == 0) { 494 // NB, PI_NOINTR processors are effectively online ... 495 if (info.pi_state == P_ONLINE || info.pi_state == P_NOINTR) { 496 (*id_array)[found] = next; 497 found += 1; 498 } 499 } 500 next += 1; 501 } 502 if (found < *id_length) { 503 // The loop above didn't identify the expected number of processors. 504 // We could always retry the operation, calling sysconf(_SC_NPROCESSORS_ONLN) 505 // and re-running the loop, above, but there's no guarantee of progress 506 // if the system configuration is in flux. Instead, we just return what 507 // we've got. Note that in the worst case find_processors_online() could 508 // return an empty set. (As a fall-back in the case of the empty set we 509 // could just return the ID of the current processor). 510 *id_length = found ; 511 } 512 513 return true; 514 } 515 516 static bool assign_distribution(processorid_t* id_array, 517 uint id_length, 518 uint* distribution, 519 uint distribution_length) { 520 // We assume we can assign processorid_t's to uint's. 521 assert(sizeof(processorid_t) == sizeof(uint), 522 "can't convert processorid_t to uint"); 523 // Quick check to see if we won't succeed. 524 if (id_length < distribution_length) { 525 return false; 526 } 527 // Assign processor ids to the distribution. 528 // Try to shuffle processors to distribute work across boards, 529 // assuming 4 processors per board. 530 const uint processors_per_board = ProcessDistributionStride; 531 // Find the maximum processor id. 532 processorid_t max_id = 0; 533 for (uint m = 0; m < id_length; m += 1) { 534 max_id = MAX2(max_id, id_array[m]); 535 } 536 // The next id, to limit loops. 537 const processorid_t limit_id = max_id + 1; 538 // Make up markers for available processors. 539 bool* available_id = NEW_C_HEAP_ARRAY(bool, limit_id, mtInternal); 540 for (uint c = 0; c < limit_id; c += 1) { 541 available_id[c] = false; 542 } 543 for (uint a = 0; a < id_length; a += 1) { 544 available_id[id_array[a]] = true; 545 } 546 // Step by "boards", then by "slot", copying to "assigned". 547 // NEEDS_CLEANUP: The assignment of processors should be stateful, 548 // remembering which processors have been assigned by 549 // previous calls, etc., so as to distribute several 550 // independent calls of this method. What we'd like is 551 // It would be nice to have an API that let us ask 552 // how many processes are bound to a processor, 553 // but we don't have that, either. 554 // In the short term, "board" is static so that 555 // subsequent distributions don't all start at board 0. 556 static uint board = 0; 557 uint assigned = 0; 558 // Until we've found enough processors .... 559 while (assigned < distribution_length) { 560 // ... find the next available processor in the board. 561 for (uint slot = 0; slot < processors_per_board; slot += 1) { 562 uint try_id = board * processors_per_board + slot; 563 if ((try_id < limit_id) && (available_id[try_id] == true)) { 564 distribution[assigned] = try_id; 565 available_id[try_id] = false; 566 assigned += 1; 567 break; 568 } 569 } 570 board += 1; 571 if (board * processors_per_board + 0 >= limit_id) { 572 board = 0; 573 } 574 } 575 if (available_id != NULL) { 576 FREE_C_HEAP_ARRAY(bool, available_id, mtInternal); 577 } 578 return true; 579 } 580 581 void os::set_native_thread_name(const char *name) { 582 // Not yet implemented. 583 return; 584 } 585 586 bool os::distribute_processes(uint length, uint* distribution) { 587 bool result = false; 588 // Find the processor id's of all the available CPUs. 589 processorid_t* id_array = NULL; 590 uint id_length = 0; 591 // There are some races between querying information and using it, 592 // since processor sets can change dynamically. 593 psetid_t pset = PS_NONE; 594 // Are we running in a processor set? 595 if ((pset_bind(PS_QUERY, P_PID, P_MYID, &pset) == 0) && pset != PS_NONE) { 596 result = find_processors_in_pset(pset, &id_array, &id_length); 597 } else { 598 result = find_processors_online(&id_array, &id_length); 599 } 600 if (result == true) { 601 if (id_length >= length) { 602 result = assign_distribution(id_array, id_length, distribution, length); 603 } else { 604 result = false; 605 } 606 } 607 if (id_array != NULL) { 608 FREE_C_HEAP_ARRAY(processorid_t, id_array, mtInternal); 609 } 610 return result; 611 } 612 613 bool os::bind_to_processor(uint processor_id) { 614 // We assume that a processorid_t can be stored in a uint. 615 assert(sizeof(uint) == sizeof(processorid_t), 616 "can't convert uint to processorid_t"); 617 int bind_result = 618 processor_bind(P_LWPID, // bind LWP. 619 P_MYID, // bind current LWP. 620 (processorid_t) processor_id, // id. 621 NULL); // don't return old binding. 622 return (bind_result == 0); 623 } 624 625 bool os::getenv(const char* name, char* buffer, int len) { 626 char* val = ::getenv( name ); 627 if ( val == NULL 628 || strlen(val) + 1 > len ) { 629 if (len > 0) buffer[0] = 0; // return a null string 630 return false; 631 } 632 strcpy( buffer, val ); 633 return true; 634 } 635 636 637 // Return true if user is running as root. 638 639 bool os::have_special_privileges() { 640 static bool init = false; 641 static bool privileges = false; 642 if (!init) { 643 privileges = (getuid() != geteuid()) || (getgid() != getegid()); 644 init = true; 645 } 646 return privileges; 647 } 648 649 650 void os::init_system_properties_values() { 651 char arch[12]; 652 sysinfo(SI_ARCHITECTURE, arch, sizeof(arch)); 653 654 // The next steps are taken in the product version: 655 // 656 // Obtain the JAVA_HOME value from the location of libjvm.so. 657 // This library should be located at: 658 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so. 659 // 660 // If "/jre/lib/" appears at the right place in the path, then we 661 // assume libjvm.so is installed in a JDK and we use this path. 662 // 663 // Otherwise exit with message: "Could not create the Java virtual machine." 664 // 665 // The following extra steps are taken in the debugging version: 666 // 667 // If "/jre/lib/" does NOT appear at the right place in the path 668 // instead of exit check for $JAVA_HOME environment variable. 669 // 670 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, 671 // then we append a fake suffix "hotspot/libjvm.so" to this path so 672 // it looks like libjvm.so is installed there 673 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so. 674 // 675 // Otherwise exit. 676 // 677 // Important note: if the location of libjvm.so changes this 678 // code needs to be changed accordingly. 679 680 // The next few definitions allow the code to be verbatim: 681 #define malloc(n) (char*)NEW_C_HEAP_ARRAY(char, (n), mtInternal) 682 #define free(p) FREE_C_HEAP_ARRAY(char, p, mtInternal) 683 #define getenv(n) ::getenv(n) 684 685 #define EXTENSIONS_DIR "/lib/ext" 686 #define ENDORSED_DIR "/lib/endorsed" 687 #define COMMON_DIR "/usr/jdk/packages" 688 689 { 690 /* sysclasspath, java_home, dll_dir */ 691 { 692 char *home_path; 693 char *dll_path; 694 char *pslash; 695 char buf[MAXPATHLEN]; 696 os::jvm_path(buf, sizeof(buf)); 697 698 // Found the full path to libjvm.so. 699 // Now cut the path to <java_home>/jre if we can. 700 *(strrchr(buf, '/')) = '\0'; /* get rid of /libjvm.so */ 701 pslash = strrchr(buf, '/'); 702 if (pslash != NULL) 703 *pslash = '\0'; /* get rid of /{client|server|hotspot} */ 704 dll_path = malloc(strlen(buf) + 1); 705 if (dll_path == NULL) 706 return; 707 strcpy(dll_path, buf); 708 Arguments::set_dll_dir(dll_path); 709 710 if (pslash != NULL) { 711 pslash = strrchr(buf, '/'); 712 if (pslash != NULL) { 713 *pslash = '\0'; /* get rid of /<arch> */ 714 pslash = strrchr(buf, '/'); 715 if (pslash != NULL) 716 *pslash = '\0'; /* get rid of /lib */ 717 } 718 } 719 720 home_path = malloc(strlen(buf) + 1); 721 if (home_path == NULL) 722 return; 723 strcpy(home_path, buf); 724 Arguments::set_java_home(home_path); 725 726 if (!set_boot_path('/', ':')) 727 return; 728 } 729 730 /* 731 * Where to look for native libraries 732 */ 733 { 734 // Use dlinfo() to determine the correct java.library.path. 735 // 736 // If we're launched by the Java launcher, and the user 737 // does not set java.library.path explicitly on the commandline, 738 // the Java launcher sets LD_LIBRARY_PATH for us and unsets 739 // LD_LIBRARY_PATH_32 and LD_LIBRARY_PATH_64. In this case 740 // dlinfo returns LD_LIBRARY_PATH + crle settings (including 741 // /usr/lib), which is exactly what we want. 742 // 743 // If the user does set java.library.path, it completely 744 // overwrites this setting, and always has. 745 // 746 // If we're not launched by the Java launcher, we may 747 // get here with any/all of the LD_LIBRARY_PATH[_32|64] 748 // settings. Again, dlinfo does exactly what we want. 749 750 Dl_serinfo _info, *info = &_info; 751 Dl_serpath *path; 752 char* library_path; 753 char *common_path; 754 int i; 755 756 // determine search path count and required buffer size 757 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFOSIZE, (void *)info) == -1) { 758 vm_exit_during_initialization("dlinfo SERINFOSIZE request", dlerror()); 759 } 760 761 // allocate new buffer and initialize 762 info = (Dl_serinfo*)malloc(_info.dls_size); 763 if (info == NULL) { 764 vm_exit_out_of_memory(_info.dls_size, OOM_MALLOC_ERROR, 765 "init_system_properties_values info"); 766 } 767 info->dls_size = _info.dls_size; 768 info->dls_cnt = _info.dls_cnt; 769 770 // obtain search path information 771 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFO, (void *)info) == -1) { 772 free(info); 773 vm_exit_during_initialization("dlinfo SERINFO request", dlerror()); 774 } 775 776 path = &info->dls_serpath[0]; 777 778 // Note: Due to a legacy implementation, most of the library path 779 // is set in the launcher. This was to accomodate linking restrictions 780 // on legacy Solaris implementations (which are no longer supported). 781 // Eventually, all the library path setting will be done here. 782 // 783 // However, to prevent the proliferation of improperly built native 784 // libraries, the new path component /usr/jdk/packages is added here. 785 786 // Determine the actual CPU architecture. 787 char cpu_arch[12]; 788 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch)); 789 #ifdef _LP64 790 // If we are a 64-bit vm, perform the following translations: 791 // sparc -> sparcv9 792 // i386 -> amd64 793 if (strcmp(cpu_arch, "sparc") == 0) 794 strcat(cpu_arch, "v9"); 795 else if (strcmp(cpu_arch, "i386") == 0) 796 strcpy(cpu_arch, "amd64"); 797 #endif 798 799 // Construct the invariant part of ld_library_path. Note that the 800 // space for the colon and the trailing null are provided by the 801 // nulls included by the sizeof operator. 802 size_t bufsize = sizeof(COMMON_DIR) + sizeof("/lib/") + strlen(cpu_arch); 803 common_path = malloc(bufsize); 804 if (common_path == NULL) { 805 free(info); 806 vm_exit_out_of_memory(bufsize, OOM_MALLOC_ERROR, 807 "init_system_properties_values common_path"); 808 } 809 sprintf(common_path, COMMON_DIR "/lib/%s", cpu_arch); 810 811 // struct size is more than sufficient for the path components obtained 812 // through the dlinfo() call, so only add additional space for the path 813 // components explicitly added here. 814 bufsize = info->dls_size + strlen(common_path); 815 library_path = malloc(bufsize); 816 if (library_path == NULL) { 817 free(info); 818 free(common_path); 819 vm_exit_out_of_memory(bufsize, OOM_MALLOC_ERROR, 820 "init_system_properties_values library_path"); 821 } 822 library_path[0] = '\0'; 823 824 // Construct the desired Java library path from the linker's library 825 // search path. 826 // 827 // For compatibility, it is optimal that we insert the additional path 828 // components specific to the Java VM after those components specified 829 // in LD_LIBRARY_PATH (if any) but before those added by the ld.so 830 // infrastructure. 831 if (info->dls_cnt == 0) { // Not sure this can happen, but allow for it 832 strcpy(library_path, common_path); 833 } else { 834 int inserted = 0; 835 for (i = 0; i < info->dls_cnt; i++, path++) { 836 uint_t flags = path->dls_flags & LA_SER_MASK; 837 if (((flags & LA_SER_LIBPATH) == 0) && !inserted) { 838 strcat(library_path, common_path); 839 strcat(library_path, os::path_separator()); 840 inserted = 1; 841 } 842 strcat(library_path, path->dls_name); 843 strcat(library_path, os::path_separator()); 844 } 845 // eliminate trailing path separator 846 library_path[strlen(library_path)-1] = '\0'; 847 } 848 849 // happens before argument parsing - can't use a trace flag 850 // tty->print_raw("init_system_properties_values: native lib path: "); 851 // tty->print_raw_cr(library_path); 852 853 // callee copies into its own buffer 854 Arguments::set_library_path(library_path); 855 856 free(common_path); 857 free(library_path); 858 free(info); 859 } 860 861 /* 862 * Extensions directories. 863 * 864 * Note that the space for the colon and the trailing null are provided 865 * by the nulls included by the sizeof operator (so actually one byte more 866 * than necessary is allocated). 867 */ 868 { 869 char *buf = (char *) malloc(strlen(Arguments::get_java_home()) + 870 sizeof(EXTENSIONS_DIR) + sizeof(COMMON_DIR) + 871 sizeof(EXTENSIONS_DIR)); 872 sprintf(buf, "%s" EXTENSIONS_DIR ":" COMMON_DIR EXTENSIONS_DIR, 873 Arguments::get_java_home()); 874 Arguments::set_ext_dirs(buf); 875 } 876 877 /* Endorsed standards default directory. */ 878 { 879 char * buf = malloc(strlen(Arguments::get_java_home()) + sizeof(ENDORSED_DIR)); 880 sprintf(buf, "%s" ENDORSED_DIR, Arguments::get_java_home()); 881 Arguments::set_endorsed_dirs(buf); 882 } 883 } 884 885 #undef malloc 886 #undef free 887 #undef getenv 888 #undef EXTENSIONS_DIR 889 #undef ENDORSED_DIR 890 #undef COMMON_DIR 891 892 } 893 894 void os::breakpoint() { 895 BREAKPOINT; 896 } 897 898 bool os::obsolete_option(const JavaVMOption *option) 899 { 900 if (!strncmp(option->optionString, "-Xt", 3)) { 901 return true; 902 } else if (!strncmp(option->optionString, "-Xtm", 4)) { 903 return true; 904 } else if (!strncmp(option->optionString, "-Xverifyheap", 12)) { 905 return true; 906 } else if (!strncmp(option->optionString, "-Xmaxjitcodesize", 16)) { 907 return true; 908 } 909 return false; 910 } 911 912 bool os::Solaris::valid_stack_address(Thread* thread, address sp) { 913 address stackStart = (address)thread->stack_base(); 914 address stackEnd = (address)(stackStart - (address)thread->stack_size()); 915 if (sp < stackStart && sp >= stackEnd ) return true; 916 return false; 917 } 918 919 extern "C" void breakpoint() { 920 // use debugger to set breakpoint here 921 } 922 923 static thread_t main_thread; 924 925 // Thread start routine for all new Java threads 926 extern "C" void* java_start(void* thread_addr) { 927 // Try to randomize the cache line index of hot stack frames. 928 // This helps when threads of the same stack traces evict each other's 929 // cache lines. The threads can be either from the same JVM instance, or 930 // from different JVM instances. The benefit is especially true for 931 // processors with hyperthreading technology. 932 static int counter = 0; 933 int pid = os::current_process_id(); 934 alloca(((pid ^ counter++) & 7) * 128); 935 936 int prio; 937 Thread* thread = (Thread*)thread_addr; 938 OSThread* osthr = thread->osthread(); 939 940 osthr->set_lwp_id( _lwp_self() ); // Store lwp in case we are bound 941 thread->_schedctl = (void *) schedctl_init () ; 942 943 if (UseNUMA) { 944 int lgrp_id = os::numa_get_group_id(); 945 if (lgrp_id != -1) { 946 thread->set_lgrp_id(lgrp_id); 947 } 948 } 949 950 // If the creator called set priority before we started, 951 // we need to call set_native_priority now that we have an lwp. 952 // We used to get the priority from thr_getprio (we called 953 // thr_setprio way back in create_thread) and pass it to 954 // set_native_priority, but Solaris scales the priority 955 // in java_to_os_priority, so when we read it back here, 956 // we pass trash to set_native_priority instead of what's 957 // in java_to_os_priority. So we save the native priority 958 // in the osThread and recall it here. 959 960 if ( osthr->thread_id() != -1 ) { 961 if ( UseThreadPriorities ) { 962 int prio = osthr->native_priority(); 963 if (ThreadPriorityVerbose) { 964 tty->print_cr("Starting Thread " INTPTR_FORMAT ", LWP is " 965 INTPTR_FORMAT ", setting priority: %d\n", 966 osthr->thread_id(), osthr->lwp_id(), prio); 967 } 968 os::set_native_priority(thread, prio); 969 } 970 } else if (ThreadPriorityVerbose) { 971 warning("Can't set priority in _start routine, thread id hasn't been set\n"); 972 } 973 974 assert(osthr->get_state() == RUNNABLE, "invalid os thread state"); 975 976 // initialize signal mask for this thread 977 os::Solaris::hotspot_sigmask(thread); 978 979 thread->run(); 980 981 // One less thread is executing 982 // When the VMThread gets here, the main thread may have already exited 983 // which frees the CodeHeap containing the Atomic::dec code 984 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) { 985 Atomic::dec(&os::Solaris::_os_thread_count); 986 } 987 988 if (UseDetachedThreads) { 989 thr_exit(NULL); 990 ShouldNotReachHere(); 991 } 992 return NULL; 993 } 994 995 static OSThread* create_os_thread(Thread* thread, thread_t thread_id) { 996 // Allocate the OSThread object 997 OSThread* osthread = new OSThread(NULL, NULL); 998 if (osthread == NULL) return NULL; 999 1000 // Store info on the Solaris thread into the OSThread 1001 osthread->set_thread_id(thread_id); 1002 osthread->set_lwp_id(_lwp_self()); 1003 thread->_schedctl = (void *) schedctl_init () ; 1004 1005 if (UseNUMA) { 1006 int lgrp_id = os::numa_get_group_id(); 1007 if (lgrp_id != -1) { 1008 thread->set_lgrp_id(lgrp_id); 1009 } 1010 } 1011 1012 if ( ThreadPriorityVerbose ) { 1013 tty->print_cr("In create_os_thread, Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT "\n", 1014 osthread->thread_id(), osthread->lwp_id() ); 1015 } 1016 1017 // Initial thread state is INITIALIZED, not SUSPENDED 1018 osthread->set_state(INITIALIZED); 1019 1020 return osthread; 1021 } 1022 1023 void os::Solaris::hotspot_sigmask(Thread* thread) { 1024 1025 //Save caller's signal mask 1026 sigset_t sigmask; 1027 thr_sigsetmask(SIG_SETMASK, NULL, &sigmask); 1028 OSThread *osthread = thread->osthread(); 1029 osthread->set_caller_sigmask(sigmask); 1030 1031 thr_sigsetmask(SIG_UNBLOCK, os::Solaris::unblocked_signals(), NULL); 1032 if (!ReduceSignalUsage) { 1033 if (thread->is_VM_thread()) { 1034 // Only the VM thread handles BREAK_SIGNAL ... 1035 thr_sigsetmask(SIG_UNBLOCK, vm_signals(), NULL); 1036 } else { 1037 // ... all other threads block BREAK_SIGNAL 1038 assert(!sigismember(vm_signals(), SIGINT), "SIGINT should not be blocked"); 1039 thr_sigsetmask(SIG_BLOCK, vm_signals(), NULL); 1040 } 1041 } 1042 } 1043 1044 bool os::create_attached_thread(JavaThread* thread) { 1045 #ifdef ASSERT 1046 thread->verify_not_published(); 1047 #endif 1048 OSThread* osthread = create_os_thread(thread, thr_self()); 1049 if (osthread == NULL) { 1050 return false; 1051 } 1052 1053 // Initial thread state is RUNNABLE 1054 osthread->set_state(RUNNABLE); 1055 thread->set_osthread(osthread); 1056 1057 // initialize signal mask for this thread 1058 // and save the caller's signal mask 1059 os::Solaris::hotspot_sigmask(thread); 1060 1061 return true; 1062 } 1063 1064 bool os::create_main_thread(JavaThread* thread) { 1065 #ifdef ASSERT 1066 thread->verify_not_published(); 1067 #endif 1068 if (_starting_thread == NULL) { 1069 _starting_thread = create_os_thread(thread, main_thread); 1070 if (_starting_thread == NULL) { 1071 return false; 1072 } 1073 } 1074 1075 // The primodial thread is runnable from the start 1076 _starting_thread->set_state(RUNNABLE); 1077 1078 thread->set_osthread(_starting_thread); 1079 1080 // initialize signal mask for this thread 1081 // and save the caller's signal mask 1082 os::Solaris::hotspot_sigmask(thread); 1083 1084 return true; 1085 } 1086 1087 // _T2_libthread is true if we believe we are running with the newer 1088 // SunSoft lwp/libthread.so (2.8 patch, 2.9 default) 1089 bool os::Solaris::_T2_libthread = false; 1090 1091 bool os::create_thread(Thread* thread, ThreadType thr_type, size_t stack_size) { 1092 // Allocate the OSThread object 1093 OSThread* osthread = new OSThread(NULL, NULL); 1094 if (osthread == NULL) { 1095 return false; 1096 } 1097 1098 if ( ThreadPriorityVerbose ) { 1099 char *thrtyp; 1100 switch ( thr_type ) { 1101 case vm_thread: 1102 thrtyp = (char *)"vm"; 1103 break; 1104 case cgc_thread: 1105 thrtyp = (char *)"cgc"; 1106 break; 1107 case pgc_thread: 1108 thrtyp = (char *)"pgc"; 1109 break; 1110 case java_thread: 1111 thrtyp = (char *)"java"; 1112 break; 1113 case compiler_thread: 1114 thrtyp = (char *)"compiler"; 1115 break; 1116 case watcher_thread: 1117 thrtyp = (char *)"watcher"; 1118 break; 1119 default: 1120 thrtyp = (char *)"unknown"; 1121 break; 1122 } 1123 tty->print_cr("In create_thread, creating a %s thread\n", thrtyp); 1124 } 1125 1126 // Calculate stack size if it's not specified by caller. 1127 if (stack_size == 0) { 1128 // The default stack size 1M (2M for LP64). 1129 stack_size = (BytesPerWord >> 2) * K * K; 1130 1131 switch (thr_type) { 1132 case os::java_thread: 1133 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss 1134 if (JavaThread::stack_size_at_create() > 0) stack_size = JavaThread::stack_size_at_create(); 1135 break; 1136 case os::compiler_thread: 1137 if (CompilerThreadStackSize > 0) { 1138 stack_size = (size_t)(CompilerThreadStackSize * K); 1139 break; 1140 } // else fall through: 1141 // use VMThreadStackSize if CompilerThreadStackSize is not defined 1142 case os::vm_thread: 1143 case os::pgc_thread: 1144 case os::cgc_thread: 1145 case os::watcher_thread: 1146 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); 1147 break; 1148 } 1149 } 1150 stack_size = MAX2(stack_size, os::Solaris::min_stack_allowed); 1151 1152 // Initial state is ALLOCATED but not INITIALIZED 1153 osthread->set_state(ALLOCATED); 1154 1155 if (os::Solaris::_os_thread_count > os::Solaris::_os_thread_limit) { 1156 // We got lots of threads. Check if we still have some address space left. 1157 // Need to be at least 5Mb of unreserved address space. We do check by 1158 // trying to reserve some. 1159 const size_t VirtualMemoryBangSize = 20*K*K; 1160 char* mem = os::reserve_memory(VirtualMemoryBangSize); 1161 if (mem == NULL) { 1162 delete osthread; 1163 return false; 1164 } else { 1165 // Release the memory again 1166 os::release_memory(mem, VirtualMemoryBangSize); 1167 } 1168 } 1169 1170 // Setup osthread because the child thread may need it. 1171 thread->set_osthread(osthread); 1172 1173 // Create the Solaris thread 1174 // explicit THR_BOUND for T2_libthread case in case 1175 // that assumption is not accurate, but our alternate signal stack 1176 // handling is based on it which must have bound threads 1177 thread_t tid = 0; 1178 long flags = (UseDetachedThreads ? THR_DETACHED : 0) | THR_SUSPENDED 1179 | ((UseBoundThreads || os::Solaris::T2_libthread() || 1180 (thr_type == vm_thread) || 1181 (thr_type == cgc_thread) || 1182 (thr_type == pgc_thread) || 1183 (thr_type == compiler_thread && BackgroundCompilation)) ? 1184 THR_BOUND : 0); 1185 int status; 1186 1187 // 4376845 -- libthread/kernel don't provide enough LWPs to utilize all CPUs. 1188 // 1189 // On multiprocessors systems, libthread sometimes under-provisions our 1190 // process with LWPs. On a 30-way systems, for instance, we could have 1191 // 50 user-level threads in ready state and only 2 or 3 LWPs assigned 1192 // to our process. This can result in under utilization of PEs. 1193 // I suspect the problem is related to libthread's LWP 1194 // pool management and to the kernel's SIGBLOCKING "last LWP parked" 1195 // upcall policy. 1196 // 1197 // The following code is palliative -- it attempts to ensure that our 1198 // process has sufficient LWPs to take advantage of multiple PEs. 1199 // Proper long-term cures include using user-level threads bound to LWPs 1200 // (THR_BOUND) or using LWP-based synchronization. Note that there is a 1201 // slight timing window with respect to sampling _os_thread_count, but 1202 // the race is benign. Also, we should periodically recompute 1203 // _processors_online as the min of SC_NPROCESSORS_ONLN and the 1204 // the number of PEs in our partition. You might be tempted to use 1205 // THR_NEW_LWP here, but I'd recommend against it as that could 1206 // result in undesirable growth of the libthread's LWP pool. 1207 // The fix below isn't sufficient; for instance, it doesn't take into count 1208 // LWPs parked on IO. It does, however, help certain CPU-bound benchmarks. 1209 // 1210 // Some pathologies this scheme doesn't handle: 1211 // * Threads can block, releasing the LWPs. The LWPs can age out. 1212 // When a large number of threads become ready again there aren't 1213 // enough LWPs available to service them. This can occur when the 1214 // number of ready threads oscillates. 1215 // * LWPs/Threads park on IO, thus taking the LWP out of circulation. 1216 // 1217 // Finally, we should call thr_setconcurrency() periodically to refresh 1218 // the LWP pool and thwart the LWP age-out mechanism. 1219 // The "+3" term provides a little slop -- we want to slightly overprovision. 1220 1221 if (AdjustConcurrency && os::Solaris::_os_thread_count < (_processors_online+3)) { 1222 if (!(flags & THR_BOUND)) { 1223 thr_setconcurrency (os::Solaris::_os_thread_count); // avoid starvation 1224 } 1225 } 1226 // Although this doesn't hurt, we should warn of undefined behavior 1227 // when using unbound T1 threads with schedctl(). This should never 1228 // happen, as the compiler and VM threads are always created bound 1229 DEBUG_ONLY( 1230 if ((VMThreadHintNoPreempt || CompilerThreadHintNoPreempt) && 1231 (!os::Solaris::T2_libthread() && (!(flags & THR_BOUND))) && 1232 ((thr_type == vm_thread) || (thr_type == cgc_thread) || 1233 (thr_type == pgc_thread) || (thr_type == compiler_thread && BackgroundCompilation))) { 1234 warning("schedctl behavior undefined when Compiler/VM/GC Threads are Unbound"); 1235 } 1236 ); 1237 1238 1239 // Mark that we don't have an lwp or thread id yet. 1240 // In case we attempt to set the priority before the thread starts. 1241 osthread->set_lwp_id(-1); 1242 osthread->set_thread_id(-1); 1243 1244 status = thr_create(NULL, stack_size, java_start, thread, flags, &tid); 1245 if (status != 0) { 1246 if (PrintMiscellaneous && (Verbose || WizardMode)) { 1247 perror("os::create_thread"); 1248 } 1249 thread->set_osthread(NULL); 1250 // Need to clean up stuff we've allocated so far 1251 delete osthread; 1252 return false; 1253 } 1254 1255 Atomic::inc(&os::Solaris::_os_thread_count); 1256 1257 // Store info on the Solaris thread into the OSThread 1258 osthread->set_thread_id(tid); 1259 1260 // Remember that we created this thread so we can set priority on it 1261 osthread->set_vm_created(); 1262 1263 // Set the default thread priority. If using bound threads, setting 1264 // lwp priority will be delayed until thread start. 1265 set_native_priority(thread, 1266 DefaultThreadPriority == -1 ? 1267 java_to_os_priority[NormPriority] : 1268 DefaultThreadPriority); 1269 1270 // Initial thread state is INITIALIZED, not SUSPENDED 1271 osthread->set_state(INITIALIZED); 1272 1273 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain 1274 return true; 1275 } 1276 1277 /* defined for >= Solaris 10. This allows builds on earlier versions 1278 * of Solaris to take advantage of the newly reserved Solaris JVM signals 1279 * With SIGJVM1, SIGJVM2, INTERRUPT_SIGNAL is SIGJVM1, ASYNC_SIGNAL is SIGJVM2 1280 * and -XX:+UseAltSigs does nothing since these should have no conflict 1281 */ 1282 #if !defined(SIGJVM1) 1283 #define SIGJVM1 39 1284 #define SIGJVM2 40 1285 #endif 1286 1287 debug_only(static bool signal_sets_initialized = false); 1288 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs; 1289 int os::Solaris::_SIGinterrupt = INTERRUPT_SIGNAL; 1290 int os::Solaris::_SIGasync = ASYNC_SIGNAL; 1291 1292 bool os::Solaris::is_sig_ignored(int sig) { 1293 struct sigaction oact; 1294 sigaction(sig, (struct sigaction*)NULL, &oact); 1295 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) 1296 : CAST_FROM_FN_PTR(void*, oact.sa_handler); 1297 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) 1298 return true; 1299 else 1300 return false; 1301 } 1302 1303 // Note: SIGRTMIN is a macro that calls sysconf() so it will 1304 // dynamically detect SIGRTMIN value for the system at runtime, not buildtime 1305 static bool isJVM1available() { 1306 return SIGJVM1 < SIGRTMIN; 1307 } 1308 1309 void os::Solaris::signal_sets_init() { 1310 // Should also have an assertion stating we are still single-threaded. 1311 assert(!signal_sets_initialized, "Already initialized"); 1312 // Fill in signals that are necessarily unblocked for all threads in 1313 // the VM. Currently, we unblock the following signals: 1314 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden 1315 // by -Xrs (=ReduceSignalUsage)); 1316 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all 1317 // other threads. The "ReduceSignalUsage" boolean tells us not to alter 1318 // the dispositions or masks wrt these signals. 1319 // Programs embedding the VM that want to use the above signals for their 1320 // own purposes must, at this time, use the "-Xrs" option to prevent 1321 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. 1322 // (See bug 4345157, and other related bugs). 1323 // In reality, though, unblocking these signals is really a nop, since 1324 // these signals are not blocked by default. 1325 sigemptyset(&unblocked_sigs); 1326 sigemptyset(&allowdebug_blocked_sigs); 1327 sigaddset(&unblocked_sigs, SIGILL); 1328 sigaddset(&unblocked_sigs, SIGSEGV); 1329 sigaddset(&unblocked_sigs, SIGBUS); 1330 sigaddset(&unblocked_sigs, SIGFPE); 1331 1332 if (isJVM1available) { 1333 os::Solaris::set_SIGinterrupt(SIGJVM1); 1334 os::Solaris::set_SIGasync(SIGJVM2); 1335 } else if (UseAltSigs) { 1336 os::Solaris::set_SIGinterrupt(ALT_INTERRUPT_SIGNAL); 1337 os::Solaris::set_SIGasync(ALT_ASYNC_SIGNAL); 1338 } else { 1339 os::Solaris::set_SIGinterrupt(INTERRUPT_SIGNAL); 1340 os::Solaris::set_SIGasync(ASYNC_SIGNAL); 1341 } 1342 1343 sigaddset(&unblocked_sigs, os::Solaris::SIGinterrupt()); 1344 sigaddset(&unblocked_sigs, os::Solaris::SIGasync()); 1345 1346 if (!ReduceSignalUsage) { 1347 if (!os::Solaris::is_sig_ignored(SHUTDOWN1_SIGNAL)) { 1348 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); 1349 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL); 1350 } 1351 if (!os::Solaris::is_sig_ignored(SHUTDOWN2_SIGNAL)) { 1352 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); 1353 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL); 1354 } 1355 if (!os::Solaris::is_sig_ignored(SHUTDOWN3_SIGNAL)) { 1356 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); 1357 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL); 1358 } 1359 } 1360 // Fill in signals that are blocked by all but the VM thread. 1361 sigemptyset(&vm_sigs); 1362 if (!ReduceSignalUsage) 1363 sigaddset(&vm_sigs, BREAK_SIGNAL); 1364 debug_only(signal_sets_initialized = true); 1365 1366 // For diagnostics only used in run_periodic_checks 1367 sigemptyset(&check_signal_done); 1368 } 1369 1370 // These are signals that are unblocked while a thread is running Java. 1371 // (For some reason, they get blocked by default.) 1372 sigset_t* os::Solaris::unblocked_signals() { 1373 assert(signal_sets_initialized, "Not initialized"); 1374 return &unblocked_sigs; 1375 } 1376 1377 // These are the signals that are blocked while a (non-VM) thread is 1378 // running Java. Only the VM thread handles these signals. 1379 sigset_t* os::Solaris::vm_signals() { 1380 assert(signal_sets_initialized, "Not initialized"); 1381 return &vm_sigs; 1382 } 1383 1384 // These are signals that are blocked during cond_wait to allow debugger in 1385 sigset_t* os::Solaris::allowdebug_blocked_signals() { 1386 assert(signal_sets_initialized, "Not initialized"); 1387 return &allowdebug_blocked_sigs; 1388 } 1389 1390 1391 void _handle_uncaught_cxx_exception() { 1392 VMError err("An uncaught C++ exception"); 1393 err.report_and_die(); 1394 } 1395 1396 1397 // First crack at OS-specific initialization, from inside the new thread. 1398 void os::initialize_thread(Thread* thr) { 1399 int r = thr_main() ; 1400 guarantee (r == 0 || r == 1, "CR6501650 or CR6493689") ; 1401 if (r) { 1402 JavaThread* jt = (JavaThread *)thr; 1403 assert(jt != NULL,"Sanity check"); 1404 size_t stack_size; 1405 address base = jt->stack_base(); 1406 if (Arguments::created_by_java_launcher()) { 1407 // Use 2MB to allow for Solaris 7 64 bit mode. 1408 stack_size = JavaThread::stack_size_at_create() == 0 1409 ? 2048*K : JavaThread::stack_size_at_create(); 1410 1411 // There are rare cases when we may have already used more than 1412 // the basic stack size allotment before this method is invoked. 1413 // Attempt to allow for a normally sized java_stack. 1414 size_t current_stack_offset = (size_t)(base - (address)&stack_size); 1415 stack_size += ReservedSpace::page_align_size_down(current_stack_offset); 1416 } else { 1417 // 6269555: If we were not created by a Java launcher, i.e. if we are 1418 // running embedded in a native application, treat the primordial thread 1419 // as much like a native attached thread as possible. This means using 1420 // the current stack size from thr_stksegment(), unless it is too large 1421 // to reliably setup guard pages. A reasonable max size is 8MB. 1422 size_t current_size = current_stack_size(); 1423 // This should never happen, but just in case.... 1424 if (current_size == 0) current_size = 2 * K * K; 1425 stack_size = current_size > (8 * K * K) ? (8 * K * K) : current_size; 1426 } 1427 address bottom = (address)align_size_up((intptr_t)(base - stack_size), os::vm_page_size());; 1428 stack_size = (size_t)(base - bottom); 1429 1430 assert(stack_size > 0, "Stack size calculation problem"); 1431 1432 if (stack_size > jt->stack_size()) { 1433 NOT_PRODUCT( 1434 struct rlimit limits; 1435 getrlimit(RLIMIT_STACK, &limits); 1436 size_t size = adjust_stack_size(base, (size_t)limits.rlim_cur); 1437 assert(size >= jt->stack_size(), "Stack size problem in main thread"); 1438 ) 1439 tty->print_cr( 1440 "Stack size of %d Kb exceeds current limit of %d Kb.\n" 1441 "(Stack sizes are rounded up to a multiple of the system page size.)\n" 1442 "See limit(1) to increase the stack size limit.", 1443 stack_size / K, jt->stack_size() / K); 1444 vm_exit(1); 1445 } 1446 assert(jt->stack_size() >= stack_size, 1447 "Attempt to map more stack than was allocated"); 1448 jt->set_stack_size(stack_size); 1449 } 1450 1451 // 5/22/01: Right now alternate signal stacks do not handle 1452 // throwing stack overflow exceptions, see bug 4463178 1453 // Until a fix is found for this, T2 will NOT imply alternate signal 1454 // stacks. 1455 // If using T2 libthread threads, install an alternate signal stack. 1456 // Because alternate stacks associate with LWPs on Solaris, 1457 // see sigaltstack(2), if using UNBOUND threads, or if UseBoundThreads 1458 // we prefer to explicitly stack bang. 1459 // If not using T2 libthread, but using UseBoundThreads any threads 1460 // (primordial thread, jni_attachCurrentThread) we do not create, 1461 // probably are not bound, therefore they can not have an alternate 1462 // signal stack. Since our stack banging code is generated and 1463 // is shared across threads, all threads must be bound to allow 1464 // using alternate signal stacks. The alternative is to interpose 1465 // on _lwp_create to associate an alt sig stack with each LWP, 1466 // and this could be a problem when the JVM is embedded. 1467 // We would prefer to use alternate signal stacks with T2 1468 // Since there is currently no accurate way to detect T2 1469 // we do not. Assuming T2 when running T1 causes sig 11s or assertions 1470 // on installing alternate signal stacks 1471 1472 1473 // 05/09/03: removed alternate signal stack support for Solaris 1474 // The alternate signal stack mechanism is no longer needed to 1475 // handle stack overflow. This is now handled by allocating 1476 // guard pages (red zone) and stackbanging. 1477 // Initially the alternate signal stack mechanism was removed because 1478 // it did not work with T1 llibthread. Alternate 1479 // signal stacks MUST have all threads bound to lwps. Applications 1480 // can create their own threads and attach them without their being 1481 // bound under T1. This is frequently the case for the primordial thread. 1482 // If we were ever to reenable this mechanism we would need to 1483 // use the dynamic check for T2 libthread. 1484 1485 os::Solaris::init_thread_fpu_state(); 1486 std::set_terminate(_handle_uncaught_cxx_exception); 1487 } 1488 1489 1490 1491 // Free Solaris resources related to the OSThread 1492 void os::free_thread(OSThread* osthread) { 1493 assert(osthread != NULL, "os::free_thread but osthread not set"); 1494 1495 1496 // We are told to free resources of the argument thread, 1497 // but we can only really operate on the current thread. 1498 // The main thread must take the VMThread down synchronously 1499 // before the main thread exits and frees up CodeHeap 1500 guarantee((Thread::current()->osthread() == osthread 1501 || (osthread == VMThread::vm_thread()->osthread())), "os::free_thread but not current thread"); 1502 if (Thread::current()->osthread() == osthread) { 1503 // Restore caller's signal mask 1504 sigset_t sigmask = osthread->caller_sigmask(); 1505 thr_sigsetmask(SIG_SETMASK, &sigmask, NULL); 1506 } 1507 delete osthread; 1508 } 1509 1510 void os::pd_start_thread(Thread* thread) { 1511 int status = thr_continue(thread->osthread()->thread_id()); 1512 assert_status(status == 0, status, "thr_continue failed"); 1513 } 1514 1515 1516 intx os::current_thread_id() { 1517 return (intx)thr_self(); 1518 } 1519 1520 static pid_t _initial_pid = 0; 1521 1522 int os::current_process_id() { 1523 return (int)(_initial_pid ? _initial_pid : getpid()); 1524 } 1525 1526 int os::allocate_thread_local_storage() { 1527 // %%% in Win32 this allocates a memory segment pointed to by a 1528 // register. Dan Stein can implement a similar feature in 1529 // Solaris. Alternatively, the VM can do the same thing 1530 // explicitly: malloc some storage and keep the pointer in a 1531 // register (which is part of the thread's context) (or keep it 1532 // in TLS). 1533 // %%% In current versions of Solaris, thr_self and TSD can 1534 // be accessed via short sequences of displaced indirections. 1535 // The value of thr_self is available as %g7(36). 1536 // The value of thr_getspecific(k) is stored in %g7(12)(4)(k*4-4), 1537 // assuming that the current thread already has a value bound to k. 1538 // It may be worth experimenting with such access patterns, 1539 // and later having the parameters formally exported from a Solaris 1540 // interface. I think, however, that it will be faster to 1541 // maintain the invariant that %g2 always contains the 1542 // JavaThread in Java code, and have stubs simply 1543 // treat %g2 as a caller-save register, preserving it in a %lN. 1544 thread_key_t tk; 1545 if (thr_keycreate( &tk, NULL ) ) 1546 fatal(err_msg("os::allocate_thread_local_storage: thr_keycreate failed " 1547 "(%s)", strerror(errno))); 1548 return int(tk); 1549 } 1550 1551 void os::free_thread_local_storage(int index) { 1552 // %%% don't think we need anything here 1553 // if ( pthread_key_delete((pthread_key_t) tk) ) 1554 // fatal("os::free_thread_local_storage: pthread_key_delete failed"); 1555 } 1556 1557 #define SMALLINT 32 // libthread allocate for tsd_common is a version specific 1558 // small number - point is NO swap space available 1559 void os::thread_local_storage_at_put(int index, void* value) { 1560 // %%% this is used only in threadLocalStorage.cpp 1561 if (thr_setspecific((thread_key_t)index, value)) { 1562 if (errno == ENOMEM) { 1563 vm_exit_out_of_memory(SMALLINT, OOM_MALLOC_ERROR, 1564 "thr_setspecific: out of swap space"); 1565 } else { 1566 fatal(err_msg("os::thread_local_storage_at_put: thr_setspecific failed " 1567 "(%s)", strerror(errno))); 1568 } 1569 } else { 1570 ThreadLocalStorage::set_thread_in_slot ((Thread *) value) ; 1571 } 1572 } 1573 1574 // This function could be called before TLS is initialized, for example, when 1575 // VM receives an async signal or when VM causes a fatal error during 1576 // initialization. Return NULL if thr_getspecific() fails. 1577 void* os::thread_local_storage_at(int index) { 1578 // %%% this is used only in threadLocalStorage.cpp 1579 void* r = NULL; 1580 return thr_getspecific((thread_key_t)index, &r) != 0 ? NULL : r; 1581 } 1582 1583 1584 // gethrtime can move backwards if read from one cpu and then a different cpu 1585 // getTimeNanos is guaranteed to not move backward on Solaris 1586 // local spinloop created as faster for a CAS on an int than 1587 // a CAS on a 64bit jlong. Also Atomic::cmpxchg for jlong is not 1588 // supported on sparc v8 or pre supports_cx8 intel boxes. 1589 // oldgetTimeNanos for systems which do not support CAS on 64bit jlong 1590 // i.e. sparc v8 and pre supports_cx8 (i486) intel boxes 1591 inline hrtime_t oldgetTimeNanos() { 1592 int gotlock = LOCK_INVALID; 1593 hrtime_t newtime = gethrtime(); 1594 1595 for (;;) { 1596 // grab lock for max_hrtime 1597 int curlock = max_hrtime_lock; 1598 if (curlock & LOCK_BUSY) continue; 1599 if (gotlock = Atomic::cmpxchg(LOCK_BUSY, &max_hrtime_lock, LOCK_FREE) != LOCK_FREE) continue; 1600 if (newtime > max_hrtime) { 1601 max_hrtime = newtime; 1602 } else { 1603 newtime = max_hrtime; 1604 } 1605 // release lock 1606 max_hrtime_lock = LOCK_FREE; 1607 return newtime; 1608 } 1609 } 1610 // gethrtime can move backwards if read from one cpu and then a different cpu 1611 // getTimeNanos is guaranteed to not move backward on Solaris 1612 inline hrtime_t getTimeNanos() { 1613 if (VM_Version::supports_cx8()) { 1614 const hrtime_t now = gethrtime(); 1615 // Use atomic long load since 32-bit x86 uses 2 registers to keep long. 1616 const hrtime_t prev = Atomic::load((volatile jlong*)&max_hrtime); 1617 if (now <= prev) return prev; // same or retrograde time; 1618 const hrtime_t obsv = Atomic::cmpxchg(now, (volatile jlong*)&max_hrtime, prev); 1619 assert(obsv >= prev, "invariant"); // Monotonicity 1620 // If the CAS succeeded then we're done and return "now". 1621 // If the CAS failed and the observed value "obs" is >= now then 1622 // we should return "obs". If the CAS failed and now > obs > prv then 1623 // some other thread raced this thread and installed a new value, in which case 1624 // we could either (a) retry the entire operation, (b) retry trying to install now 1625 // or (c) just return obs. We use (c). No loop is required although in some cases 1626 // we might discard a higher "now" value in deference to a slightly lower but freshly 1627 // installed obs value. That's entirely benign -- it admits no new orderings compared 1628 // to (a) or (b) -- and greatly reduces coherence traffic. 1629 // We might also condition (c) on the magnitude of the delta between obs and now. 1630 // Avoiding excessive CAS operations to hot RW locations is critical. 1631 // See http://blogs.sun.com/dave/entry/cas_and_cache_trivia_invalidate 1632 return (prev == obsv) ? now : obsv ; 1633 } else { 1634 return oldgetTimeNanos(); 1635 } 1636 } 1637 1638 // Time since start-up in seconds to a fine granularity. 1639 // Used by VMSelfDestructTimer and the MemProfiler. 1640 double os::elapsedTime() { 1641 return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz; 1642 } 1643 1644 jlong os::elapsed_counter() { 1645 return (jlong)(getTimeNanos() - first_hrtime); 1646 } 1647 1648 jlong os::elapsed_frequency() { 1649 return hrtime_hz; 1650 } 1651 1652 // Return the real, user, and system times in seconds from an 1653 // arbitrary fixed point in the past. 1654 bool os::getTimesSecs(double* process_real_time, 1655 double* process_user_time, 1656 double* process_system_time) { 1657 struct tms ticks; 1658 clock_t real_ticks = times(&ticks); 1659 1660 if (real_ticks == (clock_t) (-1)) { 1661 return false; 1662 } else { 1663 double ticks_per_second = (double) clock_tics_per_sec; 1664 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; 1665 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; 1666 // For consistency return the real time from getTimeNanos() 1667 // converted to seconds. 1668 *process_real_time = ((double) getTimeNanos()) / ((double) NANOUNITS); 1669 1670 return true; 1671 } 1672 } 1673 1674 bool os::supports_vtime() { return true; } 1675 1676 bool os::enable_vtime() { 1677 int fd = ::open("/proc/self/ctl", O_WRONLY); 1678 if (fd == -1) 1679 return false; 1680 1681 long cmd[] = { PCSET, PR_MSACCT }; 1682 int res = ::write(fd, cmd, sizeof(long) * 2); 1683 ::close(fd); 1684 if (res != sizeof(long) * 2) 1685 return false; 1686 1687 return true; 1688 } 1689 1690 bool os::vtime_enabled() { 1691 int fd = ::open("/proc/self/status", O_RDONLY); 1692 if (fd == -1) 1693 return false; 1694 1695 pstatus_t status; 1696 int res = os::read(fd, (void*) &status, sizeof(pstatus_t)); 1697 ::close(fd); 1698 if (res != sizeof(pstatus_t)) 1699 return false; 1700 1701 return status.pr_flags & PR_MSACCT; 1702 } 1703 1704 double os::elapsedVTime() { 1705 return (double)gethrvtime() / (double)hrtime_hz; 1706 } 1707 1708 // Used internally for comparisons only 1709 // getTimeMillis guaranteed to not move backwards on Solaris 1710 jlong getTimeMillis() { 1711 jlong nanotime = getTimeNanos(); 1712 return (jlong)(nanotime / NANOSECS_PER_MILLISEC); 1713 } 1714 1715 // Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis 1716 jlong os::javaTimeMillis() { 1717 timeval t; 1718 if (gettimeofday( &t, NULL) == -1) 1719 fatal(err_msg("os::javaTimeMillis: gettimeofday (%s)", strerror(errno))); 1720 return jlong(t.tv_sec) * 1000 + jlong(t.tv_usec) / 1000; 1721 } 1722 1723 jlong os::javaTimeNanos() { 1724 return (jlong)getTimeNanos(); 1725 } 1726 1727 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 1728 info_ptr->max_value = ALL_64_BITS; // gethrtime() uses all 64 bits 1729 info_ptr->may_skip_backward = false; // not subject to resetting or drifting 1730 info_ptr->may_skip_forward = false; // not subject to resetting or drifting 1731 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 1732 } 1733 1734 char * os::local_time_string(char *buf, size_t buflen) { 1735 struct tm t; 1736 time_t long_time; 1737 time(&long_time); 1738 localtime_r(&long_time, &t); 1739 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 1740 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, 1741 t.tm_hour, t.tm_min, t.tm_sec); 1742 return buf; 1743 } 1744 1745 // Note: os::shutdown() might be called very early during initialization, or 1746 // called from signal handler. Before adding something to os::shutdown(), make 1747 // sure it is async-safe and can handle partially initialized VM. 1748 void os::shutdown() { 1749 1750 // allow PerfMemory to attempt cleanup of any persistent resources 1751 perfMemory_exit(); 1752 1753 // needs to remove object in file system 1754 AttachListener::abort(); 1755 1756 // flush buffered output, finish log files 1757 ostream_abort(); 1758 1759 // Check for abort hook 1760 abort_hook_t abort_hook = Arguments::abort_hook(); 1761 if (abort_hook != NULL) { 1762 abort_hook(); 1763 } 1764 } 1765 1766 // Note: os::abort() might be called very early during initialization, or 1767 // called from signal handler. Before adding something to os::abort(), make 1768 // sure it is async-safe and can handle partially initialized VM. 1769 void os::abort(bool dump_core) { 1770 os::shutdown(); 1771 if (dump_core) { 1772 #ifndef PRODUCT 1773 fdStream out(defaultStream::output_fd()); 1774 out.print_raw("Current thread is "); 1775 char buf[16]; 1776 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); 1777 out.print_raw_cr(buf); 1778 out.print_raw_cr("Dumping core ..."); 1779 #endif 1780 ::abort(); // dump core (for debugging) 1781 } 1782 1783 ::exit(1); 1784 } 1785 1786 // Die immediately, no exit hook, no abort hook, no cleanup. 1787 void os::die() { 1788 ::abort(); // dump core (for debugging) 1789 } 1790 1791 // unused 1792 void os::set_error_file(const char *logfile) {} 1793 1794 // DLL functions 1795 1796 const char* os::dll_file_extension() { return ".so"; } 1797 1798 // This must be hard coded because it's the system's temporary 1799 // directory not the java application's temp directory, ala java.io.tmpdir. 1800 const char* os::get_temp_directory() { return "/tmp"; } 1801 1802 static bool file_exists(const char* filename) { 1803 struct stat statbuf; 1804 if (filename == NULL || strlen(filename) == 0) { 1805 return false; 1806 } 1807 return os::stat(filename, &statbuf) == 0; 1808 } 1809 1810 bool os::dll_build_name(char* buffer, size_t buflen, 1811 const char* pname, const char* fname) { 1812 bool retval = false; 1813 const size_t pnamelen = pname ? strlen(pname) : 0; 1814 1815 // Return error on buffer overflow. 1816 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) { 1817 return retval; 1818 } 1819 1820 if (pnamelen == 0) { 1821 snprintf(buffer, buflen, "lib%s.so", fname); 1822 retval = true; 1823 } else if (strchr(pname, *os::path_separator()) != NULL) { 1824 int n; 1825 char** pelements = split_path(pname, &n); 1826 if (pelements == NULL) { 1827 return false; 1828 } 1829 for (int i = 0 ; i < n ; i++) { 1830 // really shouldn't be NULL but what the heck, check can't hurt 1831 if (pelements[i] == NULL || strlen(pelements[i]) == 0) { 1832 continue; // skip the empty path values 1833 } 1834 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname); 1835 if (file_exists(buffer)) { 1836 retval = true; 1837 break; 1838 } 1839 } 1840 // release the storage 1841 for (int i = 0 ; i < n ; i++) { 1842 if (pelements[i] != NULL) { 1843 FREE_C_HEAP_ARRAY(char, pelements[i], mtInternal); 1844 } 1845 } 1846 if (pelements != NULL) { 1847 FREE_C_HEAP_ARRAY(char*, pelements, mtInternal); 1848 } 1849 } else { 1850 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname); 1851 retval = true; 1852 } 1853 return retval; 1854 } 1855 1856 // check if addr is inside libjvm.so 1857 bool os::address_is_in_vm(address addr) { 1858 static address libjvm_base_addr; 1859 Dl_info dlinfo; 1860 1861 if (libjvm_base_addr == NULL) { 1862 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) { 1863 libjvm_base_addr = (address)dlinfo.dli_fbase; 1864 } 1865 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); 1866 } 1867 1868 if (dladdr((void *)addr, &dlinfo) != 0) { 1869 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; 1870 } 1871 1872 return false; 1873 } 1874 1875 typedef int (*dladdr1_func_type) (void *, Dl_info *, void **, int); 1876 static dladdr1_func_type dladdr1_func = NULL; 1877 1878 bool os::dll_address_to_function_name(address addr, char *buf, 1879 int buflen, int * offset) { 1880 // buf is not optional, but offset is optional 1881 assert(buf != NULL, "sanity check"); 1882 1883 Dl_info dlinfo; 1884 1885 // dladdr1_func was initialized in os::init() 1886 if (dladdr1_func != NULL) { 1887 // yes, we have dladdr1 1888 1889 // Support for dladdr1 is checked at runtime; it may be 1890 // available even if the vm is built on a machine that does 1891 // not have dladdr1 support. Make sure there is a value for 1892 // RTLD_DL_SYMENT. 1893 #ifndef RTLD_DL_SYMENT 1894 #define RTLD_DL_SYMENT 1 1895 #endif 1896 #ifdef _LP64 1897 Elf64_Sym * info; 1898 #else 1899 Elf32_Sym * info; 1900 #endif 1901 if (dladdr1_func((void *)addr, &dlinfo, (void **)&info, 1902 RTLD_DL_SYMENT) != 0) { 1903 // see if we have a matching symbol that covers our address 1904 if (dlinfo.dli_saddr != NULL && 1905 (char *)dlinfo.dli_saddr + info->st_size > (char *)addr) { 1906 if (dlinfo.dli_sname != NULL) { 1907 if (!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) { 1908 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); 1909 } 1910 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1911 return true; 1912 } 1913 } 1914 // no matching symbol so try for just file info 1915 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { 1916 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1917 buf, buflen, offset, dlinfo.dli_fname)) { 1918 return true; 1919 } 1920 } 1921 } 1922 buf[0] = '\0'; 1923 if (offset != NULL) *offset = -1; 1924 return false; 1925 } 1926 1927 // no, only dladdr is available 1928 if (dladdr((void *)addr, &dlinfo) != 0) { 1929 // see if we have a matching symbol 1930 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) { 1931 if (!Decoder::demangle(dlinfo.dli_sname, buf, buflen)) { 1932 jio_snprintf(buf, buflen, dlinfo.dli_sname); 1933 } 1934 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1935 return true; 1936 } 1937 // no matching symbol so try for just file info 1938 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { 1939 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1940 buf, buflen, offset, dlinfo.dli_fname)) { 1941 return true; 1942 } 1943 } 1944 } 1945 buf[0] = '\0'; 1946 if (offset != NULL) *offset = -1; 1947 return false; 1948 } 1949 1950 bool os::dll_address_to_library_name(address addr, char* buf, 1951 int buflen, int* offset) { 1952 // buf is not optional, but offset is optional 1953 assert(buf != NULL, "sanity check"); 1954 1955 Dl_info dlinfo; 1956 1957 if (dladdr((void*)addr, &dlinfo) != 0) { 1958 if (dlinfo.dli_fname != NULL) { 1959 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); 1960 } 1961 if (dlinfo.dli_fbase != NULL && offset != NULL) { 1962 *offset = addr - (address)dlinfo.dli_fbase; 1963 } 1964 return true; 1965 } 1966 1967 buf[0] = '\0'; 1968 if (offset) *offset = -1; 1969 return false; 1970 } 1971 1972 // Prints the names and full paths of all opened dynamic libraries 1973 // for current process 1974 void os::print_dll_info(outputStream * st) { 1975 Dl_info dli; 1976 void *handle; 1977 Link_map *map; 1978 Link_map *p; 1979 1980 st->print_cr("Dynamic libraries:"); st->flush(); 1981 1982 if (dladdr(CAST_FROM_FN_PTR(void *, os::print_dll_info), &dli) == 0 || 1983 dli.dli_fname == NULL) { 1984 st->print_cr("Error: Cannot print dynamic libraries."); 1985 return; 1986 } 1987 handle = dlopen(dli.dli_fname, RTLD_LAZY); 1988 if (handle == NULL) { 1989 st->print_cr("Error: Cannot print dynamic libraries."); 1990 return; 1991 } 1992 dlinfo(handle, RTLD_DI_LINKMAP, &map); 1993 if (map == NULL) { 1994 st->print_cr("Error: Cannot print dynamic libraries."); 1995 return; 1996 } 1997 1998 while (map->l_prev != NULL) 1999 map = map->l_prev; 2000 2001 while (map != NULL) { 2002 st->print_cr(PTR_FORMAT " \t%s", map->l_addr, map->l_name); 2003 map = map->l_next; 2004 } 2005 2006 dlclose(handle); 2007 } 2008 2009 // Loads .dll/.so and 2010 // in case of error it checks if .dll/.so was built for the 2011 // same architecture as Hotspot is running on 2012 2013 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) 2014 { 2015 void * result= ::dlopen(filename, RTLD_LAZY); 2016 if (result != NULL) { 2017 // Successful loading 2018 return result; 2019 } 2020 2021 Elf32_Ehdr elf_head; 2022 2023 // Read system error message into ebuf 2024 // It may or may not be overwritten below 2025 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 2026 ebuf[ebuflen-1]='\0'; 2027 int diag_msg_max_length=ebuflen-strlen(ebuf); 2028 char* diag_msg_buf=ebuf+strlen(ebuf); 2029 2030 if (diag_msg_max_length==0) { 2031 // No more space in ebuf for additional diagnostics message 2032 return NULL; 2033 } 2034 2035 2036 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); 2037 2038 if (file_descriptor < 0) { 2039 // Can't open library, report dlerror() message 2040 return NULL; 2041 } 2042 2043 bool failed_to_read_elf_head= 2044 (sizeof(elf_head)!= 2045 (::read(file_descriptor, &elf_head,sizeof(elf_head)))) ; 2046 2047 ::close(file_descriptor); 2048 if (failed_to_read_elf_head) { 2049 // file i/o error - report dlerror() msg 2050 return NULL; 2051 } 2052 2053 typedef struct { 2054 Elf32_Half code; // Actual value as defined in elf.h 2055 Elf32_Half compat_class; // Compatibility of archs at VM's sense 2056 char elf_class; // 32 or 64 bit 2057 char endianess; // MSB or LSB 2058 char* name; // String representation 2059 } arch_t; 2060 2061 static const arch_t arch_array[]={ 2062 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 2063 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 2064 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, 2065 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, 2066 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 2067 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 2068 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, 2069 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, 2070 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, 2071 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM 32"} 2072 }; 2073 2074 #if (defined IA32) 2075 static Elf32_Half running_arch_code=EM_386; 2076 #elif (defined AMD64) 2077 static Elf32_Half running_arch_code=EM_X86_64; 2078 #elif (defined IA64) 2079 static Elf32_Half running_arch_code=EM_IA_64; 2080 #elif (defined __sparc) && (defined _LP64) 2081 static Elf32_Half running_arch_code=EM_SPARCV9; 2082 #elif (defined __sparc) && (!defined _LP64) 2083 static Elf32_Half running_arch_code=EM_SPARC; 2084 #elif (defined __powerpc64__) 2085 static Elf32_Half running_arch_code=EM_PPC64; 2086 #elif (defined __powerpc__) 2087 static Elf32_Half running_arch_code=EM_PPC; 2088 #elif (defined ARM) 2089 static Elf32_Half running_arch_code=EM_ARM; 2090 #else 2091 #error Method os::dll_load requires that one of following is defined:\ 2092 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, ARM 2093 #endif 2094 2095 // Identify compatability class for VM's architecture and library's architecture 2096 // Obtain string descriptions for architectures 2097 2098 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; 2099 int running_arch_index=-1; 2100 2101 for (unsigned int i=0 ; i < ARRAY_SIZE(arch_array) ; i++ ) { 2102 if (running_arch_code == arch_array[i].code) { 2103 running_arch_index = i; 2104 } 2105 if (lib_arch.code == arch_array[i].code) { 2106 lib_arch.compat_class = arch_array[i].compat_class; 2107 lib_arch.name = arch_array[i].name; 2108 } 2109 } 2110 2111 assert(running_arch_index != -1, 2112 "Didn't find running architecture code (running_arch_code) in arch_array"); 2113 if (running_arch_index == -1) { 2114 // Even though running architecture detection failed 2115 // we may still continue with reporting dlerror() message 2116 return NULL; 2117 } 2118 2119 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { 2120 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); 2121 return NULL; 2122 } 2123 2124 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { 2125 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); 2126 return NULL; 2127 } 2128 2129 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { 2130 if ( lib_arch.name!=NULL ) { 2131 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 2132 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", 2133 lib_arch.name, arch_array[running_arch_index].name); 2134 } else { 2135 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 2136 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", 2137 lib_arch.code, 2138 arch_array[running_arch_index].name); 2139 } 2140 } 2141 2142 return NULL; 2143 } 2144 2145 void* os::dll_lookup(void* handle, const char* name) { 2146 return dlsym(handle, name); 2147 } 2148 2149 void* os::get_default_process_handle() { 2150 return (void*)::dlopen(NULL, RTLD_LAZY); 2151 } 2152 2153 int os::stat(const char *path, struct stat *sbuf) { 2154 char pathbuf[MAX_PATH]; 2155 if (strlen(path) > MAX_PATH - 1) { 2156 errno = ENAMETOOLONG; 2157 return -1; 2158 } 2159 os::native_path(strcpy(pathbuf, path)); 2160 return ::stat(pathbuf, sbuf); 2161 } 2162 2163 static bool _print_ascii_file(const char* filename, outputStream* st) { 2164 int fd = ::open(filename, O_RDONLY); 2165 if (fd == -1) { 2166 return false; 2167 } 2168 2169 char buf[32]; 2170 int bytes; 2171 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { 2172 st->print_raw(buf, bytes); 2173 } 2174 2175 ::close(fd); 2176 2177 return true; 2178 } 2179 2180 void os::print_os_info_brief(outputStream* st) { 2181 os::Solaris::print_distro_info(st); 2182 2183 os::Posix::print_uname_info(st); 2184 2185 os::Solaris::print_libversion_info(st); 2186 } 2187 2188 void os::print_os_info(outputStream* st) { 2189 st->print("OS:"); 2190 2191 os::Solaris::print_distro_info(st); 2192 2193 os::Posix::print_uname_info(st); 2194 2195 os::Solaris::print_libversion_info(st); 2196 2197 os::Posix::print_rlimit_info(st); 2198 2199 os::Posix::print_load_average(st); 2200 } 2201 2202 void os::Solaris::print_distro_info(outputStream* st) { 2203 if (!_print_ascii_file("/etc/release", st)) { 2204 st->print("Solaris"); 2205 } 2206 st->cr(); 2207 } 2208 2209 void os::Solaris::print_libversion_info(outputStream* st) { 2210 if (os::Solaris::T2_libthread()) { 2211 st->print(" (T2 libthread)"); 2212 } 2213 else { 2214 st->print(" (T1 libthread)"); 2215 } 2216 st->cr(); 2217 } 2218 2219 static bool check_addr0(outputStream* st) { 2220 jboolean status = false; 2221 int fd = ::open("/proc/self/map",O_RDONLY); 2222 if (fd >= 0) { 2223 prmap_t p; 2224 while(::read(fd, &p, sizeof(p)) > 0) { 2225 if (p.pr_vaddr == 0x0) { 2226 st->print("Warning: Address: 0x%x, Size: %dK, ",p.pr_vaddr, p.pr_size/1024, p.pr_mapname); 2227 st->print("Mapped file: %s, ", p.pr_mapname[0] == '\0' ? "None" : p.pr_mapname); 2228 st->print("Access:"); 2229 st->print("%s",(p.pr_mflags & MA_READ) ? "r" : "-"); 2230 st->print("%s",(p.pr_mflags & MA_WRITE) ? "w" : "-"); 2231 st->print("%s",(p.pr_mflags & MA_EXEC) ? "x" : "-"); 2232 st->cr(); 2233 status = true; 2234 } 2235 } 2236 ::close(fd); 2237 } 2238 return status; 2239 } 2240 2241 void os::pd_print_cpu_info(outputStream* st) { 2242 // Nothing to do for now. 2243 } 2244 2245 void os::print_memory_info(outputStream* st) { 2246 st->print("Memory:"); 2247 st->print(" %dk page", os::vm_page_size()>>10); 2248 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10); 2249 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10); 2250 st->cr(); 2251 (void) check_addr0(st); 2252 } 2253 2254 // Taken from /usr/include/sys/machsig.h Supposed to be architecture specific 2255 // but they're the same for all the solaris architectures that we support. 2256 const char *ill_names[] = { "ILL0", "ILL_ILLOPC", "ILL_ILLOPN", "ILL_ILLADR", 2257 "ILL_ILLTRP", "ILL_PRVOPC", "ILL_PRVREG", 2258 "ILL_COPROC", "ILL_BADSTK" }; 2259 2260 const size_t ill_names_length = (sizeof(ill_names)/sizeof(char *)); 2261 2262 const char *fpe_names[] = { "FPE0", "FPE_INTDIV", "FPE_INTOVF", "FPE_FLTDIV", 2263 "FPE_FLTOVF", "FPE_FLTUND", "FPE_FLTRES", 2264 "FPE_FLTINV", "FPE_FLTSUB" }; 2265 const size_t fpe_names_length = (sizeof(fpe_names)/sizeof(char *)); 2266 2267 const char *segv_names[] = { "SEGV0", "SEGV_MAPERR", "SEGV_ACCERR" }; 2268 const size_t segv_names_length = (sizeof(segv_names)/sizeof(char *)); 2269 2270 const char *bus_names[] = { "BUS0", "BUS_ADRALN", "BUS_ADRERR", "BUS_OBJERR" }; 2271 const size_t bus_names_length = (sizeof(bus_names)/sizeof(char *)); 2272 2273 void os::print_siginfo(outputStream* st, void* siginfo) { 2274 st->print("siginfo:"); 2275 2276 const int buflen = 100; 2277 char buf[buflen]; 2278 siginfo_t *si = (siginfo_t*)siginfo; 2279 st->print("si_signo=%s: ", os::exception_name(si->si_signo, buf, buflen)); 2280 char *err = strerror(si->si_errno); 2281 if (si->si_errno != 0 && err != NULL) { 2282 st->print("si_errno=%s", err); 2283 } else { 2284 st->print("si_errno=%d", si->si_errno); 2285 } 2286 const int c = si->si_code; 2287 assert(c > 0, "unexpected si_code"); 2288 switch (si->si_signo) { 2289 case SIGILL: 2290 st->print(", si_code=%d (%s)", c, 2291 c >= ill_names_length ? "" : ill_names[c]); 2292 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 2293 break; 2294 case SIGFPE: 2295 st->print(", si_code=%d (%s)", c, 2296 c >= fpe_names_length ? "" : fpe_names[c]); 2297 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 2298 break; 2299 case SIGSEGV: 2300 st->print(", si_code=%d (%s)", c, 2301 c >= segv_names_length ? "" : segv_names[c]); 2302 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 2303 break; 2304 case SIGBUS: 2305 st->print(", si_code=%d (%s)", c, 2306 c >= bus_names_length ? "" : bus_names[c]); 2307 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 2308 break; 2309 default: 2310 st->print(", si_code=%d", si->si_code); 2311 // no si_addr 2312 } 2313 2314 if ((si->si_signo == SIGBUS || si->si_signo == SIGSEGV) && 2315 UseSharedSpaces) { 2316 FileMapInfo* mapinfo = FileMapInfo::current_info(); 2317 if (mapinfo->is_in_shared_space(si->si_addr)) { 2318 st->print("\n\nError accessing class data sharing archive." \ 2319 " Mapped file inaccessible during execution, " \ 2320 " possible disk/network problem."); 2321 } 2322 } 2323 st->cr(); 2324 } 2325 2326 // Moved from whole group, because we need them here for diagnostic 2327 // prints. 2328 #define OLDMAXSIGNUM 32 2329 static int Maxsignum = 0; 2330 static int *ourSigFlags = NULL; 2331 2332 extern "C" void sigINTRHandler(int, siginfo_t*, void*); 2333 2334 int os::Solaris::get_our_sigflags(int sig) { 2335 assert(ourSigFlags!=NULL, "signal data structure not initialized"); 2336 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range"); 2337 return ourSigFlags[sig]; 2338 } 2339 2340 void os::Solaris::set_our_sigflags(int sig, int flags) { 2341 assert(ourSigFlags!=NULL, "signal data structure not initialized"); 2342 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range"); 2343 ourSigFlags[sig] = flags; 2344 } 2345 2346 2347 static const char* get_signal_handler_name(address handler, 2348 char* buf, int buflen) { 2349 int offset; 2350 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 2351 if (found) { 2352 // skip directory names 2353 const char *p1, *p2; 2354 p1 = buf; 2355 size_t len = strlen(os::file_separator()); 2356 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 2357 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); 2358 } else { 2359 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 2360 } 2361 return buf; 2362 } 2363 2364 static void print_signal_handler(outputStream* st, int sig, 2365 char* buf, size_t buflen) { 2366 struct sigaction sa; 2367 2368 sigaction(sig, NULL, &sa); 2369 2370 st->print("%s: ", os::exception_name(sig, buf, buflen)); 2371 2372 address handler = (sa.sa_flags & SA_SIGINFO) 2373 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 2374 : CAST_FROM_FN_PTR(address, sa.sa_handler); 2375 2376 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 2377 st->print("SIG_DFL"); 2378 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 2379 st->print("SIG_IGN"); 2380 } else { 2381 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 2382 } 2383 2384 st->print(", sa_mask[0]=" PTR32_FORMAT, *(uint32_t*)&sa.sa_mask); 2385 2386 address rh = VMError::get_resetted_sighandler(sig); 2387 // May be, handler was resetted by VMError? 2388 if(rh != NULL) { 2389 handler = rh; 2390 sa.sa_flags = VMError::get_resetted_sigflags(sig); 2391 } 2392 2393 st->print(", sa_flags=" PTR32_FORMAT, sa.sa_flags); 2394 2395 // Check: is it our handler? 2396 if(handler == CAST_FROM_FN_PTR(address, signalHandler) || 2397 handler == CAST_FROM_FN_PTR(address, sigINTRHandler)) { 2398 // It is our signal handler 2399 // check for flags 2400 if(sa.sa_flags != os::Solaris::get_our_sigflags(sig)) { 2401 st->print( 2402 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", 2403 os::Solaris::get_our_sigflags(sig)); 2404 } 2405 } 2406 st->cr(); 2407 } 2408 2409 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 2410 st->print_cr("Signal Handlers:"); 2411 print_signal_handler(st, SIGSEGV, buf, buflen); 2412 print_signal_handler(st, SIGBUS , buf, buflen); 2413 print_signal_handler(st, SIGFPE , buf, buflen); 2414 print_signal_handler(st, SIGPIPE, buf, buflen); 2415 print_signal_handler(st, SIGXFSZ, buf, buflen); 2416 print_signal_handler(st, SIGILL , buf, buflen); 2417 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen); 2418 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen); 2419 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); 2420 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen); 2421 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); 2422 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen); 2423 print_signal_handler(st, os::Solaris::SIGinterrupt(), buf, buflen); 2424 print_signal_handler(st, os::Solaris::SIGasync(), buf, buflen); 2425 } 2426 2427 static char saved_jvm_path[MAXPATHLEN] = { 0 }; 2428 2429 // Find the full path to the current module, libjvm.so 2430 void os::jvm_path(char *buf, jint buflen) { 2431 // Error checking. 2432 if (buflen < MAXPATHLEN) { 2433 assert(false, "must use a large-enough buffer"); 2434 buf[0] = '\0'; 2435 return; 2436 } 2437 // Lazy resolve the path to current module. 2438 if (saved_jvm_path[0] != 0) { 2439 strcpy(buf, saved_jvm_path); 2440 return; 2441 } 2442 2443 Dl_info dlinfo; 2444 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo); 2445 assert(ret != 0, "cannot locate libjvm"); 2446 if (ret != 0 && dlinfo.dli_fname != NULL) { 2447 realpath((char *)dlinfo.dli_fname, buf); 2448 } else { 2449 buf[0] = '\0'; 2450 return; 2451 } 2452 2453 if (Arguments::sun_java_launcher_is_altjvm()) { 2454 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical 2455 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so". 2456 // If "/jre/lib/" appears at the right place in the string, then 2457 // assume we are installed in a JDK and we're done. Otherwise, check 2458 // for a JAVA_HOME environment variable and fix up the path so it 2459 // looks like libjvm.so is installed there (append a fake suffix 2460 // hotspot/libjvm.so). 2461 const char *p = buf + strlen(buf) - 1; 2462 for (int count = 0; p > buf && count < 5; ++count) { 2463 for (--p; p > buf && *p != '/'; --p) 2464 /* empty */ ; 2465 } 2466 2467 if (strncmp(p, "/jre/lib/", 9) != 0) { 2468 // Look for JAVA_HOME in the environment. 2469 char* java_home_var = ::getenv("JAVA_HOME"); 2470 if (java_home_var != NULL && java_home_var[0] != 0) { 2471 char cpu_arch[12]; 2472 char* jrelib_p; 2473 int len; 2474 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch)); 2475 #ifdef _LP64 2476 // If we are on sparc running a 64-bit vm, look in jre/lib/sparcv9. 2477 if (strcmp(cpu_arch, "sparc") == 0) { 2478 strcat(cpu_arch, "v9"); 2479 } else if (strcmp(cpu_arch, "i386") == 0) { 2480 strcpy(cpu_arch, "amd64"); 2481 } 2482 #endif 2483 // Check the current module name "libjvm.so". 2484 p = strrchr(buf, '/'); 2485 assert(strstr(p, "/libjvm") == p, "invalid library name"); 2486 2487 realpath(java_home_var, buf); 2488 // determine if this is a legacy image or modules image 2489 // modules image doesn't have "jre" subdirectory 2490 len = strlen(buf); 2491 jrelib_p = buf + len; 2492 snprintf(jrelib_p, buflen-len, "/jre/lib/%s", cpu_arch); 2493 if (0 != access(buf, F_OK)) { 2494 snprintf(jrelib_p, buflen-len, "/lib/%s", cpu_arch); 2495 } 2496 2497 if (0 == access(buf, F_OK)) { 2498 // Use current module name "libjvm.so" 2499 len = strlen(buf); 2500 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so"); 2501 } else { 2502 // Go back to path of .so 2503 realpath((char *)dlinfo.dli_fname, buf); 2504 } 2505 } 2506 } 2507 } 2508 2509 strcpy(saved_jvm_path, buf); 2510 } 2511 2512 2513 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 2514 // no prefix required, not even "_" 2515 } 2516 2517 2518 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 2519 // no suffix required 2520 } 2521 2522 // This method is a copy of JDK's sysGetLastErrorString 2523 // from src/solaris/hpi/src/system_md.c 2524 2525 size_t os::lasterror(char *buf, size_t len) { 2526 2527 if (errno == 0) return 0; 2528 2529 const char *s = ::strerror(errno); 2530 size_t n = ::strlen(s); 2531 if (n >= len) { 2532 n = len - 1; 2533 } 2534 ::strncpy(buf, s, n); 2535 buf[n] = '\0'; 2536 return n; 2537 } 2538 2539 2540 // sun.misc.Signal 2541 2542 extern "C" { 2543 static void UserHandler(int sig, void *siginfo, void *context) { 2544 // Ctrl-C is pressed during error reporting, likely because the error 2545 // handler fails to abort. Let VM die immediately. 2546 if (sig == SIGINT && is_error_reported()) { 2547 os::die(); 2548 } 2549 2550 os::signal_notify(sig); 2551 // We do not need to reinstate the signal handler each time... 2552 } 2553 } 2554 2555 void* os::user_handler() { 2556 return CAST_FROM_FN_PTR(void*, UserHandler); 2557 } 2558 2559 class Semaphore : public StackObj { 2560 public: 2561 Semaphore(); 2562 ~Semaphore(); 2563 void signal(); 2564 void wait(); 2565 bool trywait(); 2566 bool timedwait(unsigned int sec, int nsec); 2567 private: 2568 sema_t _semaphore; 2569 }; 2570 2571 2572 Semaphore::Semaphore() { 2573 sema_init(&_semaphore, 0, NULL, NULL); 2574 } 2575 2576 Semaphore::~Semaphore() { 2577 sema_destroy(&_semaphore); 2578 } 2579 2580 void Semaphore::signal() { 2581 sema_post(&_semaphore); 2582 } 2583 2584 void Semaphore::wait() { 2585 sema_wait(&_semaphore); 2586 } 2587 2588 bool Semaphore::trywait() { 2589 return sema_trywait(&_semaphore) == 0; 2590 } 2591 2592 bool Semaphore::timedwait(unsigned int sec, int nsec) { 2593 struct timespec ts; 2594 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec); 2595 2596 while (1) { 2597 int result = sema_timedwait(&_semaphore, &ts); 2598 if (result == 0) { 2599 return true; 2600 } else if (errno == EINTR) { 2601 continue; 2602 } else if (errno == ETIME) { 2603 return false; 2604 } else { 2605 return false; 2606 } 2607 } 2608 } 2609 2610 extern "C" { 2611 typedef void (*sa_handler_t)(int); 2612 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); 2613 } 2614 2615 void* os::signal(int signal_number, void* handler) { 2616 struct sigaction sigAct, oldSigAct; 2617 sigfillset(&(sigAct.sa_mask)); 2618 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND; 2619 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); 2620 2621 if (sigaction(signal_number, &sigAct, &oldSigAct)) 2622 // -1 means registration failed 2623 return (void *)-1; 2624 2625 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); 2626 } 2627 2628 void os::signal_raise(int signal_number) { 2629 raise(signal_number); 2630 } 2631 2632 /* 2633 * The following code is moved from os.cpp for making this 2634 * code platform specific, which it is by its very nature. 2635 */ 2636 2637 // a counter for each possible signal value 2638 static int Sigexit = 0; 2639 static int Maxlibjsigsigs; 2640 static jint *pending_signals = NULL; 2641 static int *preinstalled_sigs = NULL; 2642 static struct sigaction *chainedsigactions = NULL; 2643 static sema_t sig_sem; 2644 typedef int (*version_getting_t)(); 2645 version_getting_t os::Solaris::get_libjsig_version = NULL; 2646 static int libjsigversion = NULL; 2647 2648 int os::sigexitnum_pd() { 2649 assert(Sigexit > 0, "signal memory not yet initialized"); 2650 return Sigexit; 2651 } 2652 2653 void os::Solaris::init_signal_mem() { 2654 // Initialize signal structures 2655 Maxsignum = SIGRTMAX; 2656 Sigexit = Maxsignum+1; 2657 assert(Maxsignum >0, "Unable to obtain max signal number"); 2658 2659 Maxlibjsigsigs = Maxsignum; 2660 2661 // pending_signals has one int per signal 2662 // The additional signal is for SIGEXIT - exit signal to signal_thread 2663 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal); 2664 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1))); 2665 2666 if (UseSignalChaining) { 2667 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction) 2668 * (Maxsignum + 1), mtInternal); 2669 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1))); 2670 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1), mtInternal); 2671 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1))); 2672 } 2673 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1 ), mtInternal); 2674 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1)); 2675 } 2676 2677 void os::signal_init_pd() { 2678 int ret; 2679 2680 ret = ::sema_init(&sig_sem, 0, NULL, NULL); 2681 assert(ret == 0, "sema_init() failed"); 2682 } 2683 2684 void os::signal_notify(int signal_number) { 2685 int ret; 2686 2687 Atomic::inc(&pending_signals[signal_number]); 2688 ret = ::sema_post(&sig_sem); 2689 assert(ret == 0, "sema_post() failed"); 2690 } 2691 2692 static int check_pending_signals(bool wait_for_signal) { 2693 int ret; 2694 while (true) { 2695 for (int i = 0; i < Sigexit + 1; i++) { 2696 jint n = pending_signals[i]; 2697 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 2698 return i; 2699 } 2700 } 2701 if (!wait_for_signal) { 2702 return -1; 2703 } 2704 JavaThread *thread = JavaThread::current(); 2705 ThreadBlockInVM tbivm(thread); 2706 2707 bool threadIsSuspended; 2708 do { 2709 thread->set_suspend_equivalent(); 2710 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 2711 while((ret = ::sema_wait(&sig_sem)) == EINTR) 2712 ; 2713 assert(ret == 0, "sema_wait() failed"); 2714 2715 // were we externally suspended while we were waiting? 2716 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2717 if (threadIsSuspended) { 2718 // 2719 // The semaphore has been incremented, but while we were waiting 2720 // another thread suspended us. We don't want to continue running 2721 // while suspended because that would surprise the thread that 2722 // suspended us. 2723 // 2724 ret = ::sema_post(&sig_sem); 2725 assert(ret == 0, "sema_post() failed"); 2726 2727 thread->java_suspend_self(); 2728 } 2729 } while (threadIsSuspended); 2730 } 2731 } 2732 2733 int os::signal_lookup() { 2734 return check_pending_signals(false); 2735 } 2736 2737 int os::signal_wait() { 2738 return check_pending_signals(true); 2739 } 2740 2741 //////////////////////////////////////////////////////////////////////////////// 2742 // Virtual Memory 2743 2744 static int page_size = -1; 2745 2746 // The mmap MAP_ALIGN flag is supported on Solaris 9 and later. init_2() will 2747 // clear this var if support is not available. 2748 static bool has_map_align = true; 2749 2750 int os::vm_page_size() { 2751 assert(page_size != -1, "must call os::init"); 2752 return page_size; 2753 } 2754 2755 // Solaris allocates memory by pages. 2756 int os::vm_allocation_granularity() { 2757 assert(page_size != -1, "must call os::init"); 2758 return page_size; 2759 } 2760 2761 static bool recoverable_mmap_error(int err) { 2762 // See if the error is one we can let the caller handle. This 2763 // list of errno values comes from the Solaris mmap(2) man page. 2764 switch (err) { 2765 case EBADF: 2766 case EINVAL: 2767 case ENOTSUP: 2768 // let the caller deal with these errors 2769 return true; 2770 2771 default: 2772 // Any remaining errors on this OS can cause our reserved mapping 2773 // to be lost. That can cause confusion where different data 2774 // structures think they have the same memory mapped. The worst 2775 // scenario is if both the VM and a library think they have the 2776 // same memory mapped. 2777 return false; 2778 } 2779 } 2780 2781 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec, 2782 int err) { 2783 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 2784 ", %d) failed; error='%s' (errno=%d)", addr, bytes, exec, 2785 strerror(err), err); 2786 } 2787 2788 static void warn_fail_commit_memory(char* addr, size_t bytes, 2789 size_t alignment_hint, bool exec, 2790 int err) { 2791 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 2792 ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, bytes, 2793 alignment_hint, exec, strerror(err), err); 2794 } 2795 2796 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, bool exec) { 2797 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; 2798 size_t size = bytes; 2799 char *res = Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot); 2800 if (res != NULL) { 2801 if (UseNUMAInterleaving) { 2802 numa_make_global(addr, bytes); 2803 } 2804 return 0; 2805 } 2806 2807 int err = errno; // save errno from mmap() call in mmap_chunk() 2808 2809 if (!recoverable_mmap_error(err)) { 2810 warn_fail_commit_memory(addr, bytes, exec, err); 2811 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "committing reserved memory."); 2812 } 2813 2814 return err; 2815 } 2816 2817 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) { 2818 return Solaris::commit_memory_impl(addr, bytes, exec) == 0; 2819 } 2820 2821 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, bool exec, 2822 const char* mesg) { 2823 assert(mesg != NULL, "mesg must be specified"); 2824 int err = os::Solaris::commit_memory_impl(addr, bytes, exec); 2825 if (err != 0) { 2826 // the caller wants all commit errors to exit with the specified mesg: 2827 warn_fail_commit_memory(addr, bytes, exec, err); 2828 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, mesg); 2829 } 2830 } 2831 2832 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, 2833 size_t alignment_hint, bool exec) { 2834 int err = Solaris::commit_memory_impl(addr, bytes, exec); 2835 if (err == 0) { 2836 if (UseLargePages && (alignment_hint > (size_t)vm_page_size())) { 2837 // If the large page size has been set and the VM 2838 // is using large pages, use the large page size 2839 // if it is smaller than the alignment hint. This is 2840 // a case where the VM wants to use a larger alignment size 2841 // for its own reasons but still want to use large pages 2842 // (which is what matters to setting the mpss range. 2843 size_t page_size = 0; 2844 if (large_page_size() < alignment_hint) { 2845 assert(UseLargePages, "Expected to be here for large page use only"); 2846 page_size = large_page_size(); 2847 } else { 2848 // If the alignment hint is less than the large page 2849 // size, the VM wants a particular alignment (thus the hint) 2850 // for internal reasons. Try to set the mpss range using 2851 // the alignment_hint. 2852 page_size = alignment_hint; 2853 } 2854 // Since this is a hint, ignore any failures. 2855 (void)Solaris::setup_large_pages(addr, bytes, page_size); 2856 } 2857 } 2858 return err; 2859 } 2860 2861 bool os::pd_commit_memory(char* addr, size_t bytes, size_t alignment_hint, 2862 bool exec) { 2863 return Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec) == 0; 2864 } 2865 2866 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, 2867 size_t alignment_hint, bool exec, 2868 const char* mesg) { 2869 assert(mesg != NULL, "mesg must be specified"); 2870 int err = os::Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec); 2871 if (err != 0) { 2872 // the caller wants all commit errors to exit with the specified mesg: 2873 warn_fail_commit_memory(addr, bytes, alignment_hint, exec, err); 2874 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, mesg); 2875 } 2876 } 2877 2878 // Uncommit the pages in a specified region. 2879 void os::pd_free_memory(char* addr, size_t bytes, size_t alignment_hint) { 2880 if (madvise(addr, bytes, MADV_FREE) < 0) { 2881 debug_only(warning("MADV_FREE failed.")); 2882 return; 2883 } 2884 } 2885 2886 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 2887 return os::commit_memory(addr, size, !ExecMem); 2888 } 2889 2890 bool os::remove_stack_guard_pages(char* addr, size_t size) { 2891 return os::uncommit_memory(addr, size); 2892 } 2893 2894 // Change the page size in a given range. 2895 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 2896 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned."); 2897 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned."); 2898 if (UseLargePages) { 2899 Solaris::setup_large_pages(addr, bytes, alignment_hint); 2900 } 2901 } 2902 2903 // Tell the OS to make the range local to the first-touching LWP 2904 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { 2905 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned."); 2906 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) { 2907 debug_only(warning("MADV_ACCESS_LWP failed.")); 2908 } 2909 } 2910 2911 // Tell the OS that this range would be accessed from different LWPs. 2912 void os::numa_make_global(char *addr, size_t bytes) { 2913 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned."); 2914 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) { 2915 debug_only(warning("MADV_ACCESS_MANY failed.")); 2916 } 2917 } 2918 2919 // Get the number of the locality groups. 2920 size_t os::numa_get_groups_num() { 2921 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie()); 2922 return n != -1 ? n : 1; 2923 } 2924 2925 // Get a list of leaf locality groups. A leaf lgroup is group that 2926 // doesn't have any children. Typical leaf group is a CPU or a CPU/memory 2927 // board. An LWP is assigned to one of these groups upon creation. 2928 size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2929 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) { 2930 ids[0] = 0; 2931 return 1; 2932 } 2933 int result_size = 0, top = 1, bottom = 0, cur = 0; 2934 for (int k = 0; k < size; k++) { 2935 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur], 2936 (Solaris::lgrp_id_t*)&ids[top], size - top); 2937 if (r == -1) { 2938 ids[0] = 0; 2939 return 1; 2940 } 2941 if (!r) { 2942 // That's a leaf node. 2943 assert (bottom <= cur, "Sanity check"); 2944 // Check if the node has memory 2945 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur], 2946 NULL, 0, LGRP_RSRC_MEM) > 0) { 2947 ids[bottom++] = ids[cur]; 2948 } 2949 } 2950 top += r; 2951 cur++; 2952 } 2953 if (bottom == 0) { 2954 // Handle a situation, when the OS reports no memory available. 2955 // Assume UMA architecture. 2956 ids[0] = 0; 2957 return 1; 2958 } 2959 return bottom; 2960 } 2961 2962 // Detect the topology change. Typically happens during CPU plugging-unplugging. 2963 bool os::numa_topology_changed() { 2964 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie()); 2965 if (is_stale != -1 && is_stale) { 2966 Solaris::lgrp_fini(Solaris::lgrp_cookie()); 2967 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER); 2968 assert(c != 0, "Failure to initialize LGRP API"); 2969 Solaris::set_lgrp_cookie(c); 2970 return true; 2971 } 2972 return false; 2973 } 2974 2975 // Get the group id of the current LWP. 2976 int os::numa_get_group_id() { 2977 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID); 2978 if (lgrp_id == -1) { 2979 return 0; 2980 } 2981 const int size = os::numa_get_groups_num(); 2982 int *ids = (int*)alloca(size * sizeof(int)); 2983 2984 // Get the ids of all lgroups with memory; r is the count. 2985 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id, 2986 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM); 2987 if (r <= 0) { 2988 return 0; 2989 } 2990 return ids[os::random() % r]; 2991 } 2992 2993 // Request information about the page. 2994 bool os::get_page_info(char *start, page_info* info) { 2995 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE }; 2996 uint64_t addr = (uintptr_t)start; 2997 uint64_t outdata[2]; 2998 uint_t validity = 0; 2999 3000 if (os::Solaris::meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) { 3001 return false; 3002 } 3003 3004 info->size = 0; 3005 info->lgrp_id = -1; 3006 3007 if ((validity & 1) != 0) { 3008 if ((validity & 2) != 0) { 3009 info->lgrp_id = outdata[0]; 3010 } 3011 if ((validity & 4) != 0) { 3012 info->size = outdata[1]; 3013 } 3014 return true; 3015 } 3016 return false; 3017 } 3018 3019 // Scan the pages from start to end until a page different than 3020 // the one described in the info parameter is encountered. 3021 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { 3022 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE }; 3023 const size_t types = sizeof(info_types) / sizeof(info_types[0]); 3024 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT + 1]; 3025 uint_t validity[MAX_MEMINFO_CNT]; 3026 3027 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size); 3028 uint64_t p = (uint64_t)start; 3029 while (p < (uint64_t)end) { 3030 addrs[0] = p; 3031 size_t addrs_count = 1; 3032 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] + page_size < (uint64_t)end) { 3033 addrs[addrs_count] = addrs[addrs_count - 1] + page_size; 3034 addrs_count++; 3035 } 3036 3037 if (os::Solaris::meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) { 3038 return NULL; 3039 } 3040 3041 size_t i = 0; 3042 for (; i < addrs_count; i++) { 3043 if ((validity[i] & 1) != 0) { 3044 if ((validity[i] & 4) != 0) { 3045 if (outdata[types * i + 1] != page_expected->size) { 3046 break; 3047 } 3048 } else 3049 if (page_expected->size != 0) { 3050 break; 3051 } 3052 3053 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) { 3054 if (outdata[types * i] != page_expected->lgrp_id) { 3055 break; 3056 } 3057 } 3058 } else { 3059 return NULL; 3060 } 3061 } 3062 3063 if (i < addrs_count) { 3064 if ((validity[i] & 2) != 0) { 3065 page_found->lgrp_id = outdata[types * i]; 3066 } else { 3067 page_found->lgrp_id = -1; 3068 } 3069 if ((validity[i] & 4) != 0) { 3070 page_found->size = outdata[types * i + 1]; 3071 } else { 3072 page_found->size = 0; 3073 } 3074 return (char*)addrs[i]; 3075 } 3076 3077 p = addrs[addrs_count - 1] + page_size; 3078 } 3079 return end; 3080 } 3081 3082 bool os::pd_uncommit_memory(char* addr, size_t bytes) { 3083 size_t size = bytes; 3084 // Map uncommitted pages PROT_NONE so we fail early if we touch an 3085 // uncommitted page. Otherwise, the read/write might succeed if we 3086 // have enough swap space to back the physical page. 3087 return 3088 NULL != Solaris::mmap_chunk(addr, size, 3089 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, 3090 PROT_NONE); 3091 } 3092 3093 char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) { 3094 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0); 3095 3096 if (b == MAP_FAILED) { 3097 return NULL; 3098 } 3099 return b; 3100 } 3101 3102 char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes, size_t alignment_hint, bool fixed) { 3103 char* addr = requested_addr; 3104 int flags = MAP_PRIVATE | MAP_NORESERVE; 3105 3106 assert(!(fixed && (alignment_hint > 0)), "alignment hint meaningless with fixed mmap"); 3107 3108 if (fixed) { 3109 flags |= MAP_FIXED; 3110 } else if (has_map_align && (alignment_hint > (size_t) vm_page_size())) { 3111 flags |= MAP_ALIGN; 3112 addr = (char*) alignment_hint; 3113 } 3114 3115 // Map uncommitted pages PROT_NONE so we fail early if we touch an 3116 // uncommitted page. Otherwise, the read/write might succeed if we 3117 // have enough swap space to back the physical page. 3118 return mmap_chunk(addr, bytes, flags, PROT_NONE); 3119 } 3120 3121 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) { 3122 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint, (requested_addr != NULL)); 3123 3124 guarantee(requested_addr == NULL || requested_addr == addr, 3125 "OS failed to return requested mmap address."); 3126 return addr; 3127 } 3128 3129 // Reserve memory at an arbitrary address, only if that area is 3130 // available (and not reserved for something else). 3131 3132 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 3133 const int max_tries = 10; 3134 char* base[max_tries]; 3135 size_t size[max_tries]; 3136 3137 // Solaris adds a gap between mmap'ed regions. The size of the gap 3138 // is dependent on the requested size and the MMU. Our initial gap 3139 // value here is just a guess and will be corrected later. 3140 bool had_top_overlap = false; 3141 bool have_adjusted_gap = false; 3142 size_t gap = 0x400000; 3143 3144 // Assert only that the size is a multiple of the page size, since 3145 // that's all that mmap requires, and since that's all we really know 3146 // about at this low abstraction level. If we need higher alignment, 3147 // we can either pass an alignment to this method or verify alignment 3148 // in one of the methods further up the call chain. See bug 5044738. 3149 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); 3150 3151 // Since snv_84, Solaris attempts to honor the address hint - see 5003415. 3152 // Give it a try, if the kernel honors the hint we can return immediately. 3153 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false); 3154 3155 volatile int err = errno; 3156 if (addr == requested_addr) { 3157 return addr; 3158 } else if (addr != NULL) { 3159 pd_unmap_memory(addr, bytes); 3160 } 3161 3162 if (PrintMiscellaneous && Verbose) { 3163 char buf[256]; 3164 buf[0] = '\0'; 3165 if (addr == NULL) { 3166 jio_snprintf(buf, sizeof(buf), ": %s", strerror(err)); 3167 } 3168 warning("attempt_reserve_memory_at: couldn't reserve " SIZE_FORMAT " bytes at " 3169 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT 3170 "%s", bytes, requested_addr, addr, buf); 3171 } 3172 3173 // Address hint method didn't work. Fall back to the old method. 3174 // In theory, once SNV becomes our oldest supported platform, this 3175 // code will no longer be needed. 3176 // 3177 // Repeatedly allocate blocks until the block is allocated at the 3178 // right spot. Give up after max_tries. 3179 int i; 3180 for (i = 0; i < max_tries; ++i) { 3181 base[i] = reserve_memory(bytes); 3182 3183 if (base[i] != NULL) { 3184 // Is this the block we wanted? 3185 if (base[i] == requested_addr) { 3186 size[i] = bytes; 3187 break; 3188 } 3189 3190 // check that the gap value is right 3191 if (had_top_overlap && !have_adjusted_gap) { 3192 size_t actual_gap = base[i-1] - base[i] - bytes; 3193 if (gap != actual_gap) { 3194 // adjust the gap value and retry the last 2 allocations 3195 assert(i > 0, "gap adjustment code problem"); 3196 have_adjusted_gap = true; // adjust the gap only once, just in case 3197 gap = actual_gap; 3198 if (PrintMiscellaneous && Verbose) { 3199 warning("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap); 3200 } 3201 unmap_memory(base[i], bytes); 3202 unmap_memory(base[i-1], size[i-1]); 3203 i-=2; 3204 continue; 3205 } 3206 } 3207 3208 // Does this overlap the block we wanted? Give back the overlapped 3209 // parts and try again. 3210 // 3211 // There is still a bug in this code: if top_overlap == bytes, 3212 // the overlap is offset from requested region by the value of gap. 3213 // In this case giving back the overlapped part will not work, 3214 // because we'll give back the entire block at base[i] and 3215 // therefore the subsequent allocation will not generate a new gap. 3216 // This could be fixed with a new algorithm that used larger 3217 // or variable size chunks to find the requested region - 3218 // but such a change would introduce additional complications. 3219 // It's rare enough that the planets align for this bug, 3220 // so we'll just wait for a fix for 6204603/5003415 which 3221 // will provide a mmap flag to allow us to avoid this business. 3222 3223 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; 3224 if (top_overlap >= 0 && top_overlap < bytes) { 3225 had_top_overlap = true; 3226 unmap_memory(base[i], top_overlap); 3227 base[i] += top_overlap; 3228 size[i] = bytes - top_overlap; 3229 } else { 3230 size_t bottom_overlap = base[i] + bytes - requested_addr; 3231 if (bottom_overlap >= 0 && bottom_overlap < bytes) { 3232 if (PrintMiscellaneous && Verbose && bottom_overlap == 0) { 3233 warning("attempt_reserve_memory_at: possible alignment bug"); 3234 } 3235 unmap_memory(requested_addr, bottom_overlap); 3236 size[i] = bytes - bottom_overlap; 3237 } else { 3238 size[i] = bytes; 3239 } 3240 } 3241 } 3242 } 3243 3244 // Give back the unused reserved pieces. 3245 3246 for (int j = 0; j < i; ++j) { 3247 if (base[j] != NULL) { 3248 unmap_memory(base[j], size[j]); 3249 } 3250 } 3251 3252 return (i < max_tries) ? requested_addr : NULL; 3253 } 3254 3255 bool os::pd_release_memory(char* addr, size_t bytes) { 3256 size_t size = bytes; 3257 return munmap(addr, size) == 0; 3258 } 3259 3260 static bool solaris_mprotect(char* addr, size_t bytes, int prot) { 3261 assert(addr == (char*)align_size_down((uintptr_t)addr, os::vm_page_size()), 3262 "addr must be page aligned"); 3263 int retVal = mprotect(addr, bytes, prot); 3264 return retVal == 0; 3265 } 3266 3267 // Protect memory (Used to pass readonly pages through 3268 // JNI GetArray<type>Elements with empty arrays.) 3269 // Also, used for serialization page and for compressed oops null pointer 3270 // checking. 3271 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 3272 bool is_committed) { 3273 unsigned int p = 0; 3274 switch (prot) { 3275 case MEM_PROT_NONE: p = PROT_NONE; break; 3276 case MEM_PROT_READ: p = PROT_READ; break; 3277 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; 3278 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; 3279 default: 3280 ShouldNotReachHere(); 3281 } 3282 // is_committed is unused. 3283 return solaris_mprotect(addr, bytes, p); 3284 } 3285 3286 // guard_memory and unguard_memory only happens within stack guard pages. 3287 // Since ISM pertains only to the heap, guard and unguard memory should not 3288 /// happen with an ISM region. 3289 bool os::guard_memory(char* addr, size_t bytes) { 3290 return solaris_mprotect(addr, bytes, PROT_NONE); 3291 } 3292 3293 bool os::unguard_memory(char* addr, size_t bytes) { 3294 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE); 3295 } 3296 3297 // Large page support 3298 static size_t _large_page_size = 0; 3299 3300 // Insertion sort for small arrays (descending order). 3301 static void insertion_sort_descending(size_t* array, int len) { 3302 for (int i = 0; i < len; i++) { 3303 size_t val = array[i]; 3304 for (size_t key = i; key > 0 && array[key - 1] < val; --key) { 3305 size_t tmp = array[key]; 3306 array[key] = array[key - 1]; 3307 array[key - 1] = tmp; 3308 } 3309 } 3310 } 3311 3312 bool os::Solaris::mpss_sanity_check(bool warn, size_t* page_size) { 3313 const unsigned int usable_count = VM_Version::page_size_count(); 3314 if (usable_count == 1) { 3315 return false; 3316 } 3317 3318 // Find the right getpagesizes interface. When solaris 11 is the minimum 3319 // build platform, getpagesizes() (without the '2') can be called directly. 3320 typedef int (*gps_t)(size_t[], int); 3321 gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2")); 3322 if (gps_func == NULL) { 3323 gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes")); 3324 if (gps_func == NULL) { 3325 if (warn) { 3326 warning("MPSS is not supported by the operating system."); 3327 } 3328 return false; 3329 } 3330 } 3331 3332 // Fill the array of page sizes. 3333 int n = (*gps_func)(_page_sizes, page_sizes_max); 3334 assert(n > 0, "Solaris bug?"); 3335 3336 if (n == page_sizes_max) { 3337 // Add a sentinel value (necessary only if the array was completely filled 3338 // since it is static (zeroed at initialization)). 3339 _page_sizes[--n] = 0; 3340 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");) 3341 } 3342 assert(_page_sizes[n] == 0, "missing sentinel"); 3343 trace_page_sizes("available page sizes", _page_sizes, n); 3344 3345 if (n == 1) return false; // Only one page size available. 3346 3347 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and 3348 // select up to usable_count elements. First sort the array, find the first 3349 // acceptable value, then copy the usable sizes to the top of the array and 3350 // trim the rest. Make sure to include the default page size :-). 3351 // 3352 // A better policy could get rid of the 4M limit by taking the sizes of the 3353 // important VM memory regions (java heap and possibly the code cache) into 3354 // account. 3355 insertion_sort_descending(_page_sizes, n); 3356 const size_t size_limit = 3357 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes; 3358 int beg; 3359 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */ ; 3360 const int end = MIN2((int)usable_count, n) - 1; 3361 for (int cur = 0; cur < end; ++cur, ++beg) { 3362 _page_sizes[cur] = _page_sizes[beg]; 3363 } 3364 _page_sizes[end] = vm_page_size(); 3365 _page_sizes[end + 1] = 0; 3366 3367 if (_page_sizes[end] > _page_sizes[end - 1]) { 3368 // Default page size is not the smallest; sort again. 3369 insertion_sort_descending(_page_sizes, end + 1); 3370 } 3371 *page_size = _page_sizes[0]; 3372 3373 trace_page_sizes("usable page sizes", _page_sizes, end + 1); 3374 return true; 3375 } 3376 3377 void os::large_page_init() { 3378 if (UseLargePages) { 3379 // print a warning if any large page related flag is specified on command line 3380 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || 3381 !FLAG_IS_DEFAULT(LargePageSizeInBytes); 3382 3383 UseLargePages = Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size); 3384 } 3385 } 3386 3387 bool os::Solaris::setup_large_pages(caddr_t start, size_t bytes, size_t align) { 3388 // Signal to OS that we want large pages for addresses 3389 // from addr, addr + bytes 3390 struct memcntl_mha mpss_struct; 3391 mpss_struct.mha_cmd = MHA_MAPSIZE_VA; 3392 mpss_struct.mha_pagesize = align; 3393 mpss_struct.mha_flags = 0; 3394 // Upon successful completion, memcntl() returns 0 3395 if (memcntl(start, bytes, MC_HAT_ADVISE, (caddr_t) &mpss_struct, 0, 0)) { 3396 debug_only(warning("Attempt to use MPSS failed.")); 3397 return false; 3398 } 3399 return true; 3400 } 3401 3402 char* os::reserve_memory_special(size_t size, size_t alignment, char* addr, bool exec) { 3403 fatal("os::reserve_memory_special should not be called on Solaris."); 3404 return NULL; 3405 } 3406 3407 bool os::release_memory_special(char* base, size_t bytes) { 3408 fatal("os::release_memory_special should not be called on Solaris."); 3409 return false; 3410 } 3411 3412 size_t os::large_page_size() { 3413 return _large_page_size; 3414 } 3415 3416 // MPSS allows application to commit large page memory on demand; with ISM 3417 // the entire memory region must be allocated as shared memory. 3418 bool os::can_commit_large_page_memory() { 3419 return true; 3420 } 3421 3422 bool os::can_execute_large_page_memory() { 3423 return true; 3424 } 3425 3426 static int os_sleep(jlong millis, bool interruptible) { 3427 const jlong limit = INT_MAX; 3428 jlong prevtime; 3429 int res; 3430 3431 while (millis > limit) { 3432 if ((res = os_sleep(limit, interruptible)) != OS_OK) 3433 return res; 3434 millis -= limit; 3435 } 3436 3437 // Restart interrupted polls with new parameters until the proper delay 3438 // has been completed. 3439 3440 prevtime = getTimeMillis(); 3441 3442 while (millis > 0) { 3443 jlong newtime; 3444 3445 if (!interruptible) { 3446 // Following assert fails for os::yield_all: 3447 // assert(!thread->is_Java_thread(), "must not be java thread"); 3448 res = poll(NULL, 0, millis); 3449 } else { 3450 JavaThread *jt = JavaThread::current(); 3451 3452 INTERRUPTIBLE_NORESTART_VM_ALWAYS(poll(NULL, 0, millis), res, jt, 3453 os::Solaris::clear_interrupted); 3454 } 3455 3456 // INTERRUPTIBLE_NORESTART_VM_ALWAYS returns res == OS_INTRPT for 3457 // thread.Interrupt. 3458 3459 // See c/r 6751923. Poll can return 0 before time 3460 // has elapsed if time is set via clock_settime (as NTP does). 3461 // res == 0 if poll timed out (see man poll RETURN VALUES) 3462 // using the logic below checks that we really did 3463 // sleep at least "millis" if not we'll sleep again. 3464 if( ( res == 0 ) || ((res == OS_ERR) && (errno == EINTR))) { 3465 newtime = getTimeMillis(); 3466 assert(newtime >= prevtime, "time moving backwards"); 3467 /* Doing prevtime and newtime in microseconds doesn't help precision, 3468 and trying to round up to avoid lost milliseconds can result in a 3469 too-short delay. */ 3470 millis -= newtime - prevtime; 3471 if(millis <= 0) 3472 return OS_OK; 3473 prevtime = newtime; 3474 } else 3475 return res; 3476 } 3477 3478 return OS_OK; 3479 } 3480 3481 // Read calls from inside the vm need to perform state transitions 3482 size_t os::read(int fd, void *buf, unsigned int nBytes) { 3483 INTERRUPTIBLE_RETURN_INT_VM(::read(fd, buf, nBytes), os::Solaris::clear_interrupted); 3484 } 3485 3486 size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) { 3487 INTERRUPTIBLE_RETURN_INT(::read(fd, buf, nBytes), os::Solaris::clear_interrupted); 3488 } 3489 3490 int os::sleep(Thread* thread, jlong millis, bool interruptible) { 3491 assert(thread == Thread::current(), "thread consistency check"); 3492 3493 // TODO-FIXME: this should be removed. 3494 // On Solaris machines (especially 2.5.1) we found that sometimes the VM gets into a live lock 3495 // situation with a JavaThread being starved out of a lwp. The kernel doesn't seem to generate 3496 // a SIGWAITING signal which would enable the threads library to create a new lwp for the starving 3497 // thread. We suspect that because the Watcher thread keeps waking up at periodic intervals the kernel 3498 // is fooled into believing that the system is making progress. In the code below we block the 3499 // the watcher thread while safepoint is in progress so that it would not appear as though the 3500 // system is making progress. 3501 if (!Solaris::T2_libthread() && 3502 thread->is_Watcher_thread() && SafepointSynchronize::is_synchronizing() && !Arguments::has_profile()) { 3503 // We now try to acquire the threads lock. Since this lock is held by the VM thread during 3504 // the entire safepoint, the watcher thread will line up here during the safepoint. 3505 Threads_lock->lock_without_safepoint_check(); 3506 Threads_lock->unlock(); 3507 } 3508 3509 if (thread->is_Java_thread()) { 3510 // This is a JavaThread so we honor the _thread_blocked protocol 3511 // even for sleeps of 0 milliseconds. This was originally done 3512 // as a workaround for bug 4338139. However, now we also do it 3513 // to honor the suspend-equivalent protocol. 3514 3515 JavaThread *jt = (JavaThread *) thread; 3516 ThreadBlockInVM tbivm(jt); 3517 3518 jt->set_suspend_equivalent(); 3519 // cleared by handle_special_suspend_equivalent_condition() or 3520 // java_suspend_self() via check_and_wait_while_suspended() 3521 3522 int ret_code; 3523 if (millis <= 0) { 3524 thr_yield(); 3525 ret_code = 0; 3526 } else { 3527 // The original sleep() implementation did not create an 3528 // OSThreadWaitState helper for sleeps of 0 milliseconds. 3529 // I'm preserving that decision for now. 3530 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */); 3531 3532 ret_code = os_sleep(millis, interruptible); 3533 } 3534 3535 // were we externally suspended while we were waiting? 3536 jt->check_and_wait_while_suspended(); 3537 3538 return ret_code; 3539 } 3540 3541 // non-JavaThread from this point on: 3542 3543 if (millis <= 0) { 3544 thr_yield(); 3545 return 0; 3546 } 3547 3548 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 3549 3550 return os_sleep(millis, interruptible); 3551 } 3552 3553 void os::naked_short_sleep(jlong ms) { 3554 assert(ms < 1000, "Un-interruptable sleep, short time use only"); 3555 3556 // usleep is deprecated and removed from POSIX, in favour of nanosleep, but 3557 // Solaris requires -lrt for this. 3558 usleep((ms * 1000)); 3559 3560 return; 3561 } 3562 3563 // Sleep forever; naked call to OS-specific sleep; use with CAUTION 3564 void os::infinite_sleep() { 3565 while (true) { // sleep forever ... 3566 ::sleep(100); // ... 100 seconds at a time 3567 } 3568 } 3569 3570 // Used to convert frequent JVM_Yield() to nops 3571 bool os::dont_yield() { 3572 if (DontYieldALot) { 3573 static hrtime_t last_time = 0; 3574 hrtime_t diff = getTimeNanos() - last_time; 3575 3576 if (diff < DontYieldALotInterval * 1000000) 3577 return true; 3578 3579 last_time += diff; 3580 3581 return false; 3582 } 3583 else { 3584 return false; 3585 } 3586 } 3587 3588 // Caveat: Solaris os::yield() causes a thread-state transition whereas 3589 // the linux and win32 implementations do not. This should be checked. 3590 3591 void os::yield() { 3592 // Yields to all threads with same or greater priority 3593 os::sleep(Thread::current(), 0, false); 3594 } 3595 3596 // Note that yield semantics are defined by the scheduling class to which 3597 // the thread currently belongs. Typically, yield will _not yield to 3598 // other equal or higher priority threads that reside on the dispatch queues 3599 // of other CPUs. 3600 3601 os::YieldResult os::NakedYield() { thr_yield(); return os::YIELD_UNKNOWN; } 3602 3603 3604 // On Solaris we found that yield_all doesn't always yield to all other threads. 3605 // There have been cases where there is a thread ready to execute but it doesn't 3606 // get an lwp as the VM thread continues to spin with sleeps of 1 millisecond. 3607 // The 1 millisecond wait doesn't seem long enough for the kernel to issue a 3608 // SIGWAITING signal which will cause a new lwp to be created. So we count the 3609 // number of times yield_all is called in the one loop and increase the sleep 3610 // time after 8 attempts. If this fails too we increase the concurrency level 3611 // so that the starving thread would get an lwp 3612 3613 void os::yield_all(int attempts) { 3614 // Yields to all threads, including threads with lower priorities 3615 if (attempts == 0) { 3616 os::sleep(Thread::current(), 1, false); 3617 } else { 3618 int iterations = attempts % 30; 3619 if (iterations == 0 && !os::Solaris::T2_libthread()) { 3620 // thr_setconcurrency and _getconcurrency make sense only under T1. 3621 int noofLWPS = thr_getconcurrency(); 3622 if (noofLWPS < (Threads::number_of_threads() + 2)) { 3623 thr_setconcurrency(thr_getconcurrency() + 1); 3624 } 3625 } else if (iterations < 25) { 3626 os::sleep(Thread::current(), 1, false); 3627 } else { 3628 os::sleep(Thread::current(), 10, false); 3629 } 3630 } 3631 } 3632 3633 // Called from the tight loops to possibly influence time-sharing heuristics 3634 void os::loop_breaker(int attempts) { 3635 os::yield_all(attempts); 3636 } 3637 3638 3639 // Interface for setting lwp priorities. If we are using T2 libthread, 3640 // which forces the use of BoundThreads or we manually set UseBoundThreads, 3641 // all of our threads will be assigned to real lwp's. Using the thr_setprio 3642 // function is meaningless in this mode so we must adjust the real lwp's priority 3643 // The routines below implement the getting and setting of lwp priorities. 3644 // 3645 // Note: There are three priority scales used on Solaris. Java priotities 3646 // which range from 1 to 10, libthread "thr_setprio" scale which range 3647 // from 0 to 127, and the current scheduling class of the process we 3648 // are running in. This is typically from -60 to +60. 3649 // The setting of the lwp priorities in done after a call to thr_setprio 3650 // so Java priorities are mapped to libthread priorities and we map from 3651 // the latter to lwp priorities. We don't keep priorities stored in 3652 // Java priorities since some of our worker threads want to set priorities 3653 // higher than all Java threads. 3654 // 3655 // For related information: 3656 // (1) man -s 2 priocntl 3657 // (2) man -s 4 priocntl 3658 // (3) man dispadmin 3659 // = librt.so 3660 // = libthread/common/rtsched.c - thrp_setlwpprio(). 3661 // = ps -cL <pid> ... to validate priority. 3662 // = sched_get_priority_min and _max 3663 // pthread_create 3664 // sched_setparam 3665 // pthread_setschedparam 3666 // 3667 // Assumptions: 3668 // + We assume that all threads in the process belong to the same 3669 // scheduling class. IE. an homogenous process. 3670 // + Must be root or in IA group to change change "interactive" attribute. 3671 // Priocntl() will fail silently. The only indication of failure is when 3672 // we read-back the value and notice that it hasn't changed. 3673 // + Interactive threads enter the runq at the head, non-interactive at the tail. 3674 // + For RT, change timeslice as well. Invariant: 3675 // constant "priority integral" 3676 // Konst == TimeSlice * (60-Priority) 3677 // Given a priority, compute appropriate timeslice. 3678 // + Higher numerical values have higher priority. 3679 3680 // sched class attributes 3681 typedef struct { 3682 int schedPolicy; // classID 3683 int maxPrio; 3684 int minPrio; 3685 } SchedInfo; 3686 3687 3688 static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits; 3689 3690 #ifdef ASSERT 3691 static int ReadBackValidate = 1; 3692 #endif 3693 static int myClass = 0; 3694 static int myMin = 0; 3695 static int myMax = 0; 3696 static int myCur = 0; 3697 static bool priocntl_enable = false; 3698 3699 static const int criticalPrio = 60; // FX/60 is critical thread class/priority on T4 3700 static int java_MaxPriority_to_os_priority = 0; // Saved mapping 3701 3702 3703 // lwp_priocntl_init 3704 // 3705 // Try to determine the priority scale for our process. 3706 // 3707 // Return errno or 0 if OK. 3708 // 3709 static int lwp_priocntl_init () { 3710 int rslt; 3711 pcinfo_t ClassInfo; 3712 pcparms_t ParmInfo; 3713 int i; 3714 3715 if (!UseThreadPriorities) return 0; 3716 3717 // We are using Bound threads, we need to determine our priority ranges 3718 if (os::Solaris::T2_libthread() || UseBoundThreads) { 3719 // If ThreadPriorityPolicy is 1, switch tables 3720 if (ThreadPriorityPolicy == 1) { 3721 for (i = 0 ; i < CriticalPriority+1; i++) 3722 os::java_to_os_priority[i] = prio_policy1[i]; 3723 } 3724 if (UseCriticalJavaThreadPriority) { 3725 // MaxPriority always maps to the FX scheduling class and criticalPrio. 3726 // See set_native_priority() and set_lwp_class_and_priority(). 3727 // Save original MaxPriority mapping in case attempt to 3728 // use critical priority fails. 3729 java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority]; 3730 // Set negative to distinguish from other priorities 3731 os::java_to_os_priority[MaxPriority] = -criticalPrio; 3732 } 3733 } 3734 // Not using Bound Threads, set to ThreadPolicy 1 3735 else { 3736 for ( i = 0 ; i < CriticalPriority+1; i++ ) { 3737 os::java_to_os_priority[i] = prio_policy1[i]; 3738 } 3739 return 0; 3740 } 3741 3742 // Get IDs for a set of well-known scheduling classes. 3743 // TODO-FIXME: GETCLINFO returns the current # of classes in the 3744 // the system. We should have a loop that iterates over the 3745 // classID values, which are known to be "small" integers. 3746 3747 strcpy(ClassInfo.pc_clname, "TS"); 3748 ClassInfo.pc_cid = -1; 3749 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3750 if (rslt < 0) return errno; 3751 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1"); 3752 tsLimits.schedPolicy = ClassInfo.pc_cid; 3753 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri; 3754 tsLimits.minPrio = -tsLimits.maxPrio; 3755 3756 strcpy(ClassInfo.pc_clname, "IA"); 3757 ClassInfo.pc_cid = -1; 3758 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3759 if (rslt < 0) return errno; 3760 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1"); 3761 iaLimits.schedPolicy = ClassInfo.pc_cid; 3762 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri; 3763 iaLimits.minPrio = -iaLimits.maxPrio; 3764 3765 strcpy(ClassInfo.pc_clname, "RT"); 3766 ClassInfo.pc_cid = -1; 3767 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3768 if (rslt < 0) return errno; 3769 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1"); 3770 rtLimits.schedPolicy = ClassInfo.pc_cid; 3771 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri; 3772 rtLimits.minPrio = 0; 3773 3774 strcpy(ClassInfo.pc_clname, "FX"); 3775 ClassInfo.pc_cid = -1; 3776 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3777 if (rslt < 0) return errno; 3778 assert(ClassInfo.pc_cid != -1, "cid for FX class is -1"); 3779 fxLimits.schedPolicy = ClassInfo.pc_cid; 3780 fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri; 3781 fxLimits.minPrio = 0; 3782 3783 // Query our "current" scheduling class. 3784 // This will normally be IA, TS or, rarely, FX or RT. 3785 memset(&ParmInfo, 0, sizeof(ParmInfo)); 3786 ParmInfo.pc_cid = PC_CLNULL; 3787 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo); 3788 if (rslt < 0) return errno; 3789 myClass = ParmInfo.pc_cid; 3790 3791 // We now know our scheduling classId, get specific information 3792 // about the class. 3793 ClassInfo.pc_cid = myClass; 3794 ClassInfo.pc_clname[0] = 0; 3795 rslt = priocntl((idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo); 3796 if (rslt < 0) return errno; 3797 3798 if (ThreadPriorityVerbose) { 3799 tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname); 3800 } 3801 3802 memset(&ParmInfo, 0, sizeof(pcparms_t)); 3803 ParmInfo.pc_cid = PC_CLNULL; 3804 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo); 3805 if (rslt < 0) return errno; 3806 3807 if (ParmInfo.pc_cid == rtLimits.schedPolicy) { 3808 myMin = rtLimits.minPrio; 3809 myMax = rtLimits.maxPrio; 3810 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { 3811 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms; 3812 myMin = iaLimits.minPrio; 3813 myMax = iaLimits.maxPrio; 3814 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict 3815 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { 3816 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms; 3817 myMin = tsLimits.minPrio; 3818 myMax = tsLimits.maxPrio; 3819 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict 3820 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) { 3821 fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms; 3822 myMin = fxLimits.minPrio; 3823 myMax = fxLimits.maxPrio; 3824 myMax = MIN2(myMax, (int)fxInfo->fx_uprilim); // clamp - restrict 3825 } else { 3826 // No clue - punt 3827 if (ThreadPriorityVerbose) 3828 tty->print_cr ("Unknown scheduling class: %s ... \n", ClassInfo.pc_clname); 3829 return EINVAL; // no clue, punt 3830 } 3831 3832 if (ThreadPriorityVerbose) { 3833 tty->print_cr ("Thread priority Range: [%d..%d]\n", myMin, myMax); 3834 } 3835 3836 priocntl_enable = true; // Enable changing priorities 3837 return 0; 3838 } 3839 3840 #define IAPRI(x) ((iaparms_t *)((x).pc_clparms)) 3841 #define RTPRI(x) ((rtparms_t *)((x).pc_clparms)) 3842 #define TSPRI(x) ((tsparms_t *)((x).pc_clparms)) 3843 #define FXPRI(x) ((fxparms_t *)((x).pc_clparms)) 3844 3845 3846 // scale_to_lwp_priority 3847 // 3848 // Convert from the libthread "thr_setprio" scale to our current 3849 // lwp scheduling class scale. 3850 // 3851 static 3852 int scale_to_lwp_priority (int rMin, int rMax, int x) 3853 { 3854 int v; 3855 3856 if (x == 127) return rMax; // avoid round-down 3857 v = (((x*(rMax-rMin)))/128)+rMin; 3858 return v; 3859 } 3860 3861 3862 // set_lwp_class_and_priority 3863 // 3864 // Set the class and priority of the lwp. This call should only 3865 // be made when using bound threads (T2 threads are bound by default). 3866 // 3867 int set_lwp_class_and_priority(int ThreadID, int lwpid, 3868 int newPrio, int new_class, bool scale) { 3869 int rslt; 3870 int Actual, Expected, prv; 3871 pcparms_t ParmInfo; // for GET-SET 3872 #ifdef ASSERT 3873 pcparms_t ReadBack; // for readback 3874 #endif 3875 3876 // Set priority via PC_GETPARMS, update, PC_SETPARMS 3877 // Query current values. 3878 // TODO: accelerate this by eliminating the PC_GETPARMS call. 3879 // Cache "pcparms_t" in global ParmCache. 3880 // TODO: elide set-to-same-value 3881 3882 // If something went wrong on init, don't change priorities. 3883 if ( !priocntl_enable ) { 3884 if (ThreadPriorityVerbose) 3885 tty->print_cr("Trying to set priority but init failed, ignoring"); 3886 return EINVAL; 3887 } 3888 3889 // If lwp hasn't started yet, just return 3890 // the _start routine will call us again. 3891 if ( lwpid <= 0 ) { 3892 if (ThreadPriorityVerbose) { 3893 tty->print_cr ("deferring the set_lwp_class_and_priority of thread " 3894 INTPTR_FORMAT " to %d, lwpid not set", 3895 ThreadID, newPrio); 3896 } 3897 return 0; 3898 } 3899 3900 if (ThreadPriorityVerbose) { 3901 tty->print_cr ("set_lwp_class_and_priority(" 3902 INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ", 3903 ThreadID, lwpid, newPrio); 3904 } 3905 3906 memset(&ParmInfo, 0, sizeof(pcparms_t)); 3907 ParmInfo.pc_cid = PC_CLNULL; 3908 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo); 3909 if (rslt < 0) return errno; 3910 3911 int cur_class = ParmInfo.pc_cid; 3912 ParmInfo.pc_cid = (id_t)new_class; 3913 3914 if (new_class == rtLimits.schedPolicy) { 3915 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms; 3916 rtInfo->rt_pri = scale ? scale_to_lwp_priority(rtLimits.minPrio, 3917 rtLimits.maxPrio, newPrio) 3918 : newPrio; 3919 rtInfo->rt_tqsecs = RT_NOCHANGE; 3920 rtInfo->rt_tqnsecs = RT_NOCHANGE; 3921 if (ThreadPriorityVerbose) { 3922 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri); 3923 } 3924 } else if (new_class == iaLimits.schedPolicy) { 3925 iaparms_t* iaInfo = (iaparms_t*)ParmInfo.pc_clparms; 3926 int maxClamped = MIN2(iaLimits.maxPrio, 3927 cur_class == new_class 3928 ? (int)iaInfo->ia_uprilim : iaLimits.maxPrio); 3929 iaInfo->ia_upri = scale ? scale_to_lwp_priority(iaLimits.minPrio, 3930 maxClamped, newPrio) 3931 : newPrio; 3932 iaInfo->ia_uprilim = cur_class == new_class 3933 ? IA_NOCHANGE : (pri_t)iaLimits.maxPrio; 3934 iaInfo->ia_mode = IA_NOCHANGE; 3935 if (ThreadPriorityVerbose) { 3936 tty->print_cr("IA: [%d...%d] %d->%d\n", 3937 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri); 3938 } 3939 } else if (new_class == tsLimits.schedPolicy) { 3940 tsparms_t* tsInfo = (tsparms_t*)ParmInfo.pc_clparms; 3941 int maxClamped = MIN2(tsLimits.maxPrio, 3942 cur_class == new_class 3943 ? (int)tsInfo->ts_uprilim : tsLimits.maxPrio); 3944 tsInfo->ts_upri = scale ? scale_to_lwp_priority(tsLimits.minPrio, 3945 maxClamped, newPrio) 3946 : newPrio; 3947 tsInfo->ts_uprilim = cur_class == new_class 3948 ? TS_NOCHANGE : (pri_t)tsLimits.maxPrio; 3949 if (ThreadPriorityVerbose) { 3950 tty->print_cr("TS: [%d...%d] %d->%d\n", 3951 tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri); 3952 } 3953 } else if (new_class == fxLimits.schedPolicy) { 3954 fxparms_t* fxInfo = (fxparms_t*)ParmInfo.pc_clparms; 3955 int maxClamped = MIN2(fxLimits.maxPrio, 3956 cur_class == new_class 3957 ? (int)fxInfo->fx_uprilim : fxLimits.maxPrio); 3958 fxInfo->fx_upri = scale ? scale_to_lwp_priority(fxLimits.minPrio, 3959 maxClamped, newPrio) 3960 : newPrio; 3961 fxInfo->fx_uprilim = cur_class == new_class 3962 ? FX_NOCHANGE : (pri_t)fxLimits.maxPrio; 3963 fxInfo->fx_tqsecs = FX_NOCHANGE; 3964 fxInfo->fx_tqnsecs = FX_NOCHANGE; 3965 if (ThreadPriorityVerbose) { 3966 tty->print_cr("FX: [%d...%d] %d->%d\n", 3967 fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri); 3968 } 3969 } else { 3970 if (ThreadPriorityVerbose) { 3971 tty->print_cr("Unknown new scheduling class %d\n", new_class); 3972 } 3973 return EINVAL; // no clue, punt 3974 } 3975 3976 rslt = priocntl(P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo); 3977 if (ThreadPriorityVerbose && rslt) { 3978 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno); 3979 } 3980 if (rslt < 0) return errno; 3981 3982 #ifdef ASSERT 3983 // Sanity check: read back what we just attempted to set. 3984 // In theory it could have changed in the interim ... 3985 // 3986 // The priocntl system call is tricky. 3987 // Sometimes it'll validate the priority value argument and 3988 // return EINVAL if unhappy. At other times it fails silently. 3989 // Readbacks are prudent. 3990 3991 if (!ReadBackValidate) return 0; 3992 3993 memset(&ReadBack, 0, sizeof(pcparms_t)); 3994 ReadBack.pc_cid = PC_CLNULL; 3995 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack); 3996 assert(rslt >= 0, "priocntl failed"); 3997 Actual = Expected = 0xBAD; 3998 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match"); 3999 if (ParmInfo.pc_cid == rtLimits.schedPolicy) { 4000 Actual = RTPRI(ReadBack)->rt_pri; 4001 Expected = RTPRI(ParmInfo)->rt_pri; 4002 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { 4003 Actual = IAPRI(ReadBack)->ia_upri; 4004 Expected = IAPRI(ParmInfo)->ia_upri; 4005 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { 4006 Actual = TSPRI(ReadBack)->ts_upri; 4007 Expected = TSPRI(ParmInfo)->ts_upri; 4008 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) { 4009 Actual = FXPRI(ReadBack)->fx_upri; 4010 Expected = FXPRI(ParmInfo)->fx_upri; 4011 } else { 4012 if (ThreadPriorityVerbose) { 4013 tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n", 4014 ParmInfo.pc_cid); 4015 } 4016 } 4017 4018 if (Actual != Expected) { 4019 if (ThreadPriorityVerbose) { 4020 tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n", 4021 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected); 4022 } 4023 } 4024 #endif 4025 4026 return 0; 4027 } 4028 4029 // Solaris only gives access to 128 real priorities at a time, 4030 // so we expand Java's ten to fill this range. This would be better 4031 // if we dynamically adjusted relative priorities. 4032 // 4033 // The ThreadPriorityPolicy option allows us to select 2 different 4034 // priority scales. 4035 // 4036 // ThreadPriorityPolicy=0 4037 // Since the Solaris' default priority is MaximumPriority, we do not 4038 // set a priority lower than Max unless a priority lower than 4039 // NormPriority is requested. 4040 // 4041 // ThreadPriorityPolicy=1 4042 // This mode causes the priority table to get filled with 4043 // linear values. NormPriority get's mapped to 50% of the 4044 // Maximum priority an so on. This will cause VM threads 4045 // to get unfair treatment against other Solaris processes 4046 // which do not explicitly alter their thread priorities. 4047 // 4048 4049 int os::java_to_os_priority[CriticalPriority + 1] = { 4050 -99999, // 0 Entry should never be used 4051 4052 0, // 1 MinPriority 4053 32, // 2 4054 64, // 3 4055 4056 96, // 4 4057 127, // 5 NormPriority 4058 127, // 6 4059 4060 127, // 7 4061 127, // 8 4062 127, // 9 NearMaxPriority 4063 4064 127, // 10 MaxPriority 4065 4066 -criticalPrio // 11 CriticalPriority 4067 }; 4068 4069 OSReturn os::set_native_priority(Thread* thread, int newpri) { 4070 OSThread* osthread = thread->osthread(); 4071 4072 // Save requested priority in case the thread hasn't been started 4073 osthread->set_native_priority(newpri); 4074 4075 // Check for critical priority request 4076 bool fxcritical = false; 4077 if (newpri == -criticalPrio) { 4078 fxcritical = true; 4079 newpri = criticalPrio; 4080 } 4081 4082 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping"); 4083 if (!UseThreadPriorities) return OS_OK; 4084 4085 int status = 0; 4086 4087 if (!fxcritical) { 4088 // Use thr_setprio only if we have a priority that thr_setprio understands 4089 status = thr_setprio(thread->osthread()->thread_id(), newpri); 4090 } 4091 4092 if (os::Solaris::T2_libthread() || 4093 (UseBoundThreads && osthread->is_vm_created())) { 4094 int lwp_status = 4095 set_lwp_class_and_priority(osthread->thread_id(), 4096 osthread->lwp_id(), 4097 newpri, 4098 fxcritical ? fxLimits.schedPolicy : myClass, 4099 !fxcritical); 4100 if (lwp_status != 0 && fxcritical) { 4101 // Try again, this time without changing the scheduling class 4102 newpri = java_MaxPriority_to_os_priority; 4103 lwp_status = set_lwp_class_and_priority(osthread->thread_id(), 4104 osthread->lwp_id(), 4105 newpri, myClass, false); 4106 } 4107 status |= lwp_status; 4108 } 4109 return (status == 0) ? OS_OK : OS_ERR; 4110 } 4111 4112 4113 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { 4114 int p; 4115 if ( !UseThreadPriorities ) { 4116 *priority_ptr = NormalPriority; 4117 return OS_OK; 4118 } 4119 int status = thr_getprio(thread->osthread()->thread_id(), &p); 4120 if (status != 0) { 4121 return OS_ERR; 4122 } 4123 *priority_ptr = p; 4124 return OS_OK; 4125 } 4126 4127 4128 // Hint to the underlying OS that a task switch would not be good. 4129 // Void return because it's a hint and can fail. 4130 void os::hint_no_preempt() { 4131 schedctl_start(schedctl_init()); 4132 } 4133 4134 static void resume_clear_context(OSThread *osthread) { 4135 osthread->set_ucontext(NULL); 4136 } 4137 4138 static void suspend_save_context(OSThread *osthread, ucontext_t* context) { 4139 osthread->set_ucontext(context); 4140 } 4141 4142 static Semaphore sr_semaphore; 4143 4144 void os::Solaris::SR_handler(Thread* thread, ucontext_t* uc) { 4145 // Save and restore errno to avoid confusing native code with EINTR 4146 // after sigsuspend. 4147 int old_errno = errno; 4148 4149 OSThread* osthread = thread->osthread(); 4150 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); 4151 4152 os::SuspendResume::State current = osthread->sr.state(); 4153 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { 4154 suspend_save_context(osthread, uc); 4155 4156 // attempt to switch the state, we assume we had a SUSPEND_REQUEST 4157 os::SuspendResume::State state = osthread->sr.suspended(); 4158 if (state == os::SuspendResume::SR_SUSPENDED) { 4159 sigset_t suspend_set; // signals for sigsuspend() 4160 4161 // get current set of blocked signals and unblock resume signal 4162 thr_sigsetmask(SIG_BLOCK, NULL, &suspend_set); 4163 sigdelset(&suspend_set, os::Solaris::SIGasync()); 4164 4165 sr_semaphore.signal(); 4166 // wait here until we are resumed 4167 while (1) { 4168 sigsuspend(&suspend_set); 4169 4170 os::SuspendResume::State result = osthread->sr.running(); 4171 if (result == os::SuspendResume::SR_RUNNING) { 4172 sr_semaphore.signal(); 4173 break; 4174 } 4175 } 4176 4177 } else if (state == os::SuspendResume::SR_RUNNING) { 4178 // request was cancelled, continue 4179 } else { 4180 ShouldNotReachHere(); 4181 } 4182 4183 resume_clear_context(osthread); 4184 } else if (current == os::SuspendResume::SR_RUNNING) { 4185 // request was cancelled, continue 4186 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { 4187 // ignore 4188 } else { 4189 // ignore 4190 } 4191 4192 errno = old_errno; 4193 } 4194 4195 4196 void os::interrupt(Thread* thread) { 4197 assert(Thread::current() == thread || Threads_lock->owned_by_self(), "possibility of dangling Thread pointer"); 4198 4199 OSThread* osthread = thread->osthread(); 4200 4201 int isInterrupted = osthread->interrupted(); 4202 if (!isInterrupted) { 4203 osthread->set_interrupted(true); 4204 OrderAccess::fence(); 4205 // os::sleep() is implemented with either poll (NULL,0,timeout) or 4206 // by parking on _SleepEvent. If the former, thr_kill will unwedge 4207 // the sleeper by SIGINTR, otherwise the unpark() will wake the sleeper. 4208 ParkEvent * const slp = thread->_SleepEvent ; 4209 if (slp != NULL) slp->unpark() ; 4210 } 4211 4212 // For JSR166: unpark after setting status but before thr_kill -dl 4213 if (thread->is_Java_thread()) { 4214 ((JavaThread*)thread)->parker()->unpark(); 4215 } 4216 4217 // Handle interruptible wait() ... 4218 ParkEvent * const ev = thread->_ParkEvent ; 4219 if (ev != NULL) ev->unpark() ; 4220 4221 // When events are used everywhere for os::sleep, then this thr_kill 4222 // will only be needed if UseVMInterruptibleIO is true. 4223 4224 if (!isInterrupted) { 4225 int status = thr_kill(osthread->thread_id(), os::Solaris::SIGinterrupt()); 4226 assert_status(status == 0, status, "thr_kill"); 4227 4228 // Bump thread interruption counter 4229 RuntimeService::record_thread_interrupt_signaled_count(); 4230 } 4231 } 4232 4233 4234 bool os::is_interrupted(Thread* thread, bool clear_interrupted) { 4235 assert(Thread::current() == thread || Threads_lock->owned_by_self(), "possibility of dangling Thread pointer"); 4236 4237 OSThread* osthread = thread->osthread(); 4238 4239 bool res = osthread->interrupted(); 4240 4241 // NOTE that since there is no "lock" around these two operations, 4242 // there is the possibility that the interrupted flag will be 4243 // "false" but that the interrupt event will be set. This is 4244 // intentional. The effect of this is that Object.wait() will appear 4245 // to have a spurious wakeup, which is not harmful, and the 4246 // possibility is so rare that it is not worth the added complexity 4247 // to add yet another lock. It has also been recommended not to put 4248 // the interrupted flag into the os::Solaris::Event structure, 4249 // because it hides the issue. 4250 if (res && clear_interrupted) { 4251 osthread->set_interrupted(false); 4252 } 4253 return res; 4254 } 4255 4256 4257 void os::print_statistics() { 4258 } 4259 4260 int os::message_box(const char* title, const char* message) { 4261 int i; 4262 fdStream err(defaultStream::error_fd()); 4263 for (i = 0; i < 78; i++) err.print_raw("="); 4264 err.cr(); 4265 err.print_raw_cr(title); 4266 for (i = 0; i < 78; i++) err.print_raw("-"); 4267 err.cr(); 4268 err.print_raw_cr(message); 4269 for (i = 0; i < 78; i++) err.print_raw("="); 4270 err.cr(); 4271 4272 char buf[16]; 4273 // Prevent process from exiting upon "read error" without consuming all CPU 4274 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 4275 4276 return buf[0] == 'y' || buf[0] == 'Y'; 4277 } 4278 4279 static int sr_notify(OSThread* osthread) { 4280 int status = thr_kill(osthread->thread_id(), os::Solaris::SIGasync()); 4281 assert_status(status == 0, status, "thr_kill"); 4282 return status; 4283 } 4284 4285 // "Randomly" selected value for how long we want to spin 4286 // before bailing out on suspending a thread, also how often 4287 // we send a signal to a thread we want to resume 4288 static const int RANDOMLY_LARGE_INTEGER = 1000000; 4289 static const int RANDOMLY_LARGE_INTEGER2 = 100; 4290 4291 static bool do_suspend(OSThread* osthread) { 4292 assert(osthread->sr.is_running(), "thread should be running"); 4293 assert(!sr_semaphore.trywait(), "semaphore has invalid state"); 4294 4295 // mark as suspended and send signal 4296 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { 4297 // failed to switch, state wasn't running? 4298 ShouldNotReachHere(); 4299 return false; 4300 } 4301 4302 if (sr_notify(osthread) != 0) { 4303 ShouldNotReachHere(); 4304 } 4305 4306 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED 4307 while (true) { 4308 if (sr_semaphore.timedwait(0, 2000 * NANOSECS_PER_MILLISEC)) { 4309 break; 4310 } else { 4311 // timeout 4312 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); 4313 if (cancelled == os::SuspendResume::SR_RUNNING) { 4314 return false; 4315 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { 4316 // make sure that we consume the signal on the semaphore as well 4317 sr_semaphore.wait(); 4318 break; 4319 } else { 4320 ShouldNotReachHere(); 4321 return false; 4322 } 4323 } 4324 } 4325 4326 guarantee(osthread->sr.is_suspended(), "Must be suspended"); 4327 return true; 4328 } 4329 4330 static void do_resume(OSThread* osthread) { 4331 assert(osthread->sr.is_suspended(), "thread should be suspended"); 4332 assert(!sr_semaphore.trywait(), "invalid semaphore state"); 4333 4334 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { 4335 // failed to switch to WAKEUP_REQUEST 4336 ShouldNotReachHere(); 4337 return; 4338 } 4339 4340 while (true) { 4341 if (sr_notify(osthread) == 0) { 4342 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { 4343 if (osthread->sr.is_running()) { 4344 return; 4345 } 4346 } 4347 } else { 4348 ShouldNotReachHere(); 4349 } 4350 } 4351 4352 guarantee(osthread->sr.is_running(), "Must be running!"); 4353 } 4354 4355 void os::SuspendedThreadTask::internal_do_task() { 4356 if (do_suspend(_thread->osthread())) { 4357 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); 4358 do_task(context); 4359 do_resume(_thread->osthread()); 4360 } 4361 } 4362 4363 class PcFetcher : public os::SuspendedThreadTask { 4364 public: 4365 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {} 4366 ExtendedPC result(); 4367 protected: 4368 void do_task(const os::SuspendedThreadTaskContext& context); 4369 private: 4370 ExtendedPC _epc; 4371 }; 4372 4373 ExtendedPC PcFetcher::result() { 4374 guarantee(is_done(), "task is not done yet."); 4375 return _epc; 4376 } 4377 4378 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) { 4379 Thread* thread = context.thread(); 4380 OSThread* osthread = thread->osthread(); 4381 if (osthread->ucontext() != NULL) { 4382 _epc = os::Solaris::ucontext_get_pc((ucontext_t *) context.ucontext()); 4383 } else { 4384 // NULL context is unexpected, double-check this is the VMThread 4385 guarantee(thread->is_VM_thread(), "can only be called for VMThread"); 4386 } 4387 } 4388 4389 // A lightweight implementation that does not suspend the target thread and 4390 // thus returns only a hint. Used for profiling only! 4391 ExtendedPC os::get_thread_pc(Thread* thread) { 4392 // Make sure that it is called by the watcher and the Threads lock is owned. 4393 assert(Thread::current()->is_Watcher_thread(), "Must be watcher and own Threads_lock"); 4394 // For now, is only used to profile the VM Thread 4395 assert(thread->is_VM_thread(), "Can only be called for VMThread"); 4396 PcFetcher fetcher(thread); 4397 fetcher.run(); 4398 return fetcher.result(); 4399 } 4400 4401 4402 // This does not do anything on Solaris. This is basically a hook for being 4403 // able to use structured exception handling (thread-local exception filters) on, e.g., Win32. 4404 void os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread) { 4405 f(value, method, args, thread); 4406 } 4407 4408 // This routine may be used by user applications as a "hook" to catch signals. 4409 // The user-defined signal handler must pass unrecognized signals to this 4410 // routine, and if it returns true (non-zero), then the signal handler must 4411 // return immediately. If the flag "abort_if_unrecognized" is true, then this 4412 // routine will never retun false (zero), but instead will execute a VM panic 4413 // routine kill the process. 4414 // 4415 // If this routine returns false, it is OK to call it again. This allows 4416 // the user-defined signal handler to perform checks either before or after 4417 // the VM performs its own checks. Naturally, the user code would be making 4418 // a serious error if it tried to handle an exception (such as a null check 4419 // or breakpoint) that the VM was generating for its own correct operation. 4420 // 4421 // This routine may recognize any of the following kinds of signals: 4422 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ, 4423 // os::Solaris::SIGasync 4424 // It should be consulted by handlers for any of those signals. 4425 // It explicitly does not recognize os::Solaris::SIGinterrupt 4426 // 4427 // The caller of this routine must pass in the three arguments supplied 4428 // to the function referred to in the "sa_sigaction" (not the "sa_handler") 4429 // field of the structure passed to sigaction(). This routine assumes that 4430 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 4431 // 4432 // Note that the VM will print warnings if it detects conflicting signal 4433 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 4434 // 4435 extern "C" JNIEXPORT int 4436 JVM_handle_solaris_signal(int signo, siginfo_t* siginfo, void* ucontext, 4437 int abort_if_unrecognized); 4438 4439 4440 void signalHandler(int sig, siginfo_t* info, void* ucVoid) { 4441 int orig_errno = errno; // Preserve errno value over signal handler. 4442 JVM_handle_solaris_signal(sig, info, ucVoid, true); 4443 errno = orig_errno; 4444 } 4445 4446 /* Do not delete - if guarantee is ever removed, a signal handler (even empty) 4447 is needed to provoke threads blocked on IO to return an EINTR 4448 Note: this explicitly does NOT call JVM_handle_solaris_signal and 4449 does NOT participate in signal chaining due to requirement for 4450 NOT setting SA_RESTART to make EINTR work. */ 4451 extern "C" void sigINTRHandler(int sig, siginfo_t* info, void* ucVoid) { 4452 if (UseSignalChaining) { 4453 struct sigaction *actp = os::Solaris::get_chained_signal_action(sig); 4454 if (actp && actp->sa_handler) { 4455 vm_exit_during_initialization("Signal chaining detected for VM interrupt signal, try -XX:+UseAltSigs"); 4456 } 4457 } 4458 } 4459 4460 // This boolean allows users to forward their own non-matching signals 4461 // to JVM_handle_solaris_signal, harmlessly. 4462 bool os::Solaris::signal_handlers_are_installed = false; 4463 4464 // For signal-chaining 4465 bool os::Solaris::libjsig_is_loaded = false; 4466 typedef struct sigaction *(*get_signal_t)(int); 4467 get_signal_t os::Solaris::get_signal_action = NULL; 4468 4469 struct sigaction* os::Solaris::get_chained_signal_action(int sig) { 4470 struct sigaction *actp = NULL; 4471 4472 if ((libjsig_is_loaded) && (sig <= Maxlibjsigsigs)) { 4473 // Retrieve the old signal handler from libjsig 4474 actp = (*get_signal_action)(sig); 4475 } 4476 if (actp == NULL) { 4477 // Retrieve the preinstalled signal handler from jvm 4478 actp = get_preinstalled_handler(sig); 4479 } 4480 4481 return actp; 4482 } 4483 4484 static bool call_chained_handler(struct sigaction *actp, int sig, 4485 siginfo_t *siginfo, void *context) { 4486 // Call the old signal handler 4487 if (actp->sa_handler == SIG_DFL) { 4488 // It's more reasonable to let jvm treat it as an unexpected exception 4489 // instead of taking the default action. 4490 return false; 4491 } else if (actp->sa_handler != SIG_IGN) { 4492 if ((actp->sa_flags & SA_NODEFER) == 0) { 4493 // automaticlly block the signal 4494 sigaddset(&(actp->sa_mask), sig); 4495 } 4496 4497 sa_handler_t hand; 4498 sa_sigaction_t sa; 4499 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 4500 // retrieve the chained handler 4501 if (siginfo_flag_set) { 4502 sa = actp->sa_sigaction; 4503 } else { 4504 hand = actp->sa_handler; 4505 } 4506 4507 if ((actp->sa_flags & SA_RESETHAND) != 0) { 4508 actp->sa_handler = SIG_DFL; 4509 } 4510 4511 // try to honor the signal mask 4512 sigset_t oset; 4513 thr_sigsetmask(SIG_SETMASK, &(actp->sa_mask), &oset); 4514 4515 // call into the chained handler 4516 if (siginfo_flag_set) { 4517 (*sa)(sig, siginfo, context); 4518 } else { 4519 (*hand)(sig); 4520 } 4521 4522 // restore the signal mask 4523 thr_sigsetmask(SIG_SETMASK, &oset, 0); 4524 } 4525 // Tell jvm's signal handler the signal is taken care of. 4526 return true; 4527 } 4528 4529 bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) { 4530 bool chained = false; 4531 // signal-chaining 4532 if (UseSignalChaining) { 4533 struct sigaction *actp = get_chained_signal_action(sig); 4534 if (actp != NULL) { 4535 chained = call_chained_handler(actp, sig, siginfo, context); 4536 } 4537 } 4538 return chained; 4539 } 4540 4541 struct sigaction* os::Solaris::get_preinstalled_handler(int sig) { 4542 assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized"); 4543 if (preinstalled_sigs[sig] != 0) { 4544 return &chainedsigactions[sig]; 4545 } 4546 return NULL; 4547 } 4548 4549 void os::Solaris::save_preinstalled_handler(int sig, struct sigaction& oldAct) { 4550 4551 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range"); 4552 assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized"); 4553 chainedsigactions[sig] = oldAct; 4554 preinstalled_sigs[sig] = 1; 4555 } 4556 4557 void os::Solaris::set_signal_handler(int sig, bool set_installed, bool oktochain) { 4558 // Check for overwrite. 4559 struct sigaction oldAct; 4560 sigaction(sig, (struct sigaction*)NULL, &oldAct); 4561 void* oldhand = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 4562 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 4563 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 4564 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 4565 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) { 4566 if (AllowUserSignalHandlers || !set_installed) { 4567 // Do not overwrite; user takes responsibility to forward to us. 4568 return; 4569 } else if (UseSignalChaining) { 4570 if (oktochain) { 4571 // save the old handler in jvm 4572 save_preinstalled_handler(sig, oldAct); 4573 } else { 4574 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal, try -XX:+UseAltSigs."); 4575 } 4576 // libjsig also interposes the sigaction() call below and saves the 4577 // old sigaction on it own. 4578 } else { 4579 fatal(err_msg("Encountered unexpected pre-existing sigaction handler " 4580 "%#lx for signal %d.", (long)oldhand, sig)); 4581 } 4582 } 4583 4584 struct sigaction sigAct; 4585 sigfillset(&(sigAct.sa_mask)); 4586 sigAct.sa_handler = SIG_DFL; 4587 4588 sigAct.sa_sigaction = signalHandler; 4589 // Handle SIGSEGV on alternate signal stack if 4590 // not using stack banging 4591 if (!UseStackBanging && sig == SIGSEGV) { 4592 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK; 4593 // Interruptible i/o requires SA_RESTART cleared so EINTR 4594 // is returned instead of restarting system calls 4595 } else if (sig == os::Solaris::SIGinterrupt()) { 4596 sigemptyset(&sigAct.sa_mask); 4597 sigAct.sa_handler = NULL; 4598 sigAct.sa_flags = SA_SIGINFO; 4599 sigAct.sa_sigaction = sigINTRHandler; 4600 } else { 4601 sigAct.sa_flags = SA_SIGINFO | SA_RESTART; 4602 } 4603 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags); 4604 4605 sigaction(sig, &sigAct, &oldAct); 4606 4607 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 4608 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 4609 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 4610 } 4611 4612 4613 #define DO_SIGNAL_CHECK(sig) \ 4614 if (!sigismember(&check_signal_done, sig)) \ 4615 os::Solaris::check_signal_handler(sig) 4616 4617 // This method is a periodic task to check for misbehaving JNI applications 4618 // under CheckJNI, we can add any periodic checks here 4619 4620 void os::run_periodic_checks() { 4621 // A big source of grief is hijacking virt. addr 0x0 on Solaris, 4622 // thereby preventing a NULL checks. 4623 if(!check_addr0_done) check_addr0_done = check_addr0(tty); 4624 4625 if (check_signals == false) return; 4626 4627 // SEGV and BUS if overridden could potentially prevent 4628 // generation of hs*.log in the event of a crash, debugging 4629 // such a case can be very challenging, so we absolutely 4630 // check for the following for a good measure: 4631 DO_SIGNAL_CHECK(SIGSEGV); 4632 DO_SIGNAL_CHECK(SIGILL); 4633 DO_SIGNAL_CHECK(SIGFPE); 4634 DO_SIGNAL_CHECK(SIGBUS); 4635 DO_SIGNAL_CHECK(SIGPIPE); 4636 DO_SIGNAL_CHECK(SIGXFSZ); 4637 4638 // ReduceSignalUsage allows the user to override these handlers 4639 // see comments at the very top and jvm_solaris.h 4640 if (!ReduceSignalUsage) { 4641 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 4642 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 4643 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 4644 DO_SIGNAL_CHECK(BREAK_SIGNAL); 4645 } 4646 4647 // See comments above for using JVM1/JVM2 and UseAltSigs 4648 DO_SIGNAL_CHECK(os::Solaris::SIGinterrupt()); 4649 DO_SIGNAL_CHECK(os::Solaris::SIGasync()); 4650 4651 } 4652 4653 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 4654 4655 static os_sigaction_t os_sigaction = NULL; 4656 4657 void os::Solaris::check_signal_handler(int sig) { 4658 char buf[O_BUFLEN]; 4659 address jvmHandler = NULL; 4660 4661 struct sigaction act; 4662 if (os_sigaction == NULL) { 4663 // only trust the default sigaction, in case it has been interposed 4664 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); 4665 if (os_sigaction == NULL) return; 4666 } 4667 4668 os_sigaction(sig, (struct sigaction*)NULL, &act); 4669 4670 address thisHandler = (act.sa_flags & SA_SIGINFO) 4671 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 4672 : CAST_FROM_FN_PTR(address, act.sa_handler) ; 4673 4674 4675 switch(sig) { 4676 case SIGSEGV: 4677 case SIGBUS: 4678 case SIGFPE: 4679 case SIGPIPE: 4680 case SIGXFSZ: 4681 case SIGILL: 4682 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler); 4683 break; 4684 4685 case SHUTDOWN1_SIGNAL: 4686 case SHUTDOWN2_SIGNAL: 4687 case SHUTDOWN3_SIGNAL: 4688 case BREAK_SIGNAL: 4689 jvmHandler = (address)user_handler(); 4690 break; 4691 4692 default: 4693 int intrsig = os::Solaris::SIGinterrupt(); 4694 int asynsig = os::Solaris::SIGasync(); 4695 4696 if (sig == intrsig) { 4697 jvmHandler = CAST_FROM_FN_PTR(address, sigINTRHandler); 4698 } else if (sig == asynsig) { 4699 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler); 4700 } else { 4701 return; 4702 } 4703 break; 4704 } 4705 4706 4707 if (thisHandler != jvmHandler) { 4708 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 4709 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 4710 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 4711 // No need to check this sig any longer 4712 sigaddset(&check_signal_done, sig); 4713 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) { 4714 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 4715 tty->print("expected:" PTR32_FORMAT, os::Solaris::get_our_sigflags(sig)); 4716 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags); 4717 // No need to check this sig any longer 4718 sigaddset(&check_signal_done, sig); 4719 } 4720 4721 // Print all the signal handler state 4722 if (sigismember(&check_signal_done, sig)) { 4723 print_signal_handlers(tty, buf, O_BUFLEN); 4724 } 4725 4726 } 4727 4728 void os::Solaris::install_signal_handlers() { 4729 bool libjsigdone = false; 4730 signal_handlers_are_installed = true; 4731 4732 // signal-chaining 4733 typedef void (*signal_setting_t)(); 4734 signal_setting_t begin_signal_setting = NULL; 4735 signal_setting_t end_signal_setting = NULL; 4736 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 4737 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 4738 if (begin_signal_setting != NULL) { 4739 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 4740 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 4741 get_signal_action = CAST_TO_FN_PTR(get_signal_t, 4742 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 4743 get_libjsig_version = CAST_TO_FN_PTR(version_getting_t, 4744 dlsym(RTLD_DEFAULT, "JVM_get_libjsig_version")); 4745 libjsig_is_loaded = true; 4746 if (os::Solaris::get_libjsig_version != NULL) { 4747 libjsigversion = (*os::Solaris::get_libjsig_version)(); 4748 } 4749 assert(UseSignalChaining, "should enable signal-chaining"); 4750 } 4751 if (libjsig_is_loaded) { 4752 // Tell libjsig jvm is setting signal handlers 4753 (*begin_signal_setting)(); 4754 } 4755 4756 set_signal_handler(SIGSEGV, true, true); 4757 set_signal_handler(SIGPIPE, true, true); 4758 set_signal_handler(SIGXFSZ, true, true); 4759 set_signal_handler(SIGBUS, true, true); 4760 set_signal_handler(SIGILL, true, true); 4761 set_signal_handler(SIGFPE, true, true); 4762 4763 4764 if (os::Solaris::SIGinterrupt() > OLDMAXSIGNUM || os::Solaris::SIGasync() > OLDMAXSIGNUM) { 4765 4766 // Pre-1.4.1 Libjsig limited to signal chaining signals <= 32 so 4767 // can not register overridable signals which might be > 32 4768 if (libjsig_is_loaded && libjsigversion <= JSIG_VERSION_1_4_1) { 4769 // Tell libjsig jvm has finished setting signal handlers 4770 (*end_signal_setting)(); 4771 libjsigdone = true; 4772 } 4773 } 4774 4775 // Never ok to chain our SIGinterrupt 4776 set_signal_handler(os::Solaris::SIGinterrupt(), true, false); 4777 set_signal_handler(os::Solaris::SIGasync(), true, true); 4778 4779 if (libjsig_is_loaded && !libjsigdone) { 4780 // Tell libjsig jvm finishes setting signal handlers 4781 (*end_signal_setting)(); 4782 } 4783 4784 // We don't activate signal checker if libjsig is in place, we trust ourselves 4785 // and if UserSignalHandler is installed all bets are off. 4786 // Log that signal checking is off only if -verbose:jni is specified. 4787 if (CheckJNICalls) { 4788 if (libjsig_is_loaded) { 4789 if (PrintJNIResolving) { 4790 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); 4791 } 4792 check_signals = false; 4793 } 4794 if (AllowUserSignalHandlers) { 4795 if (PrintJNIResolving) { 4796 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 4797 } 4798 check_signals = false; 4799 } 4800 } 4801 } 4802 4803 4804 void report_error(const char* file_name, int line_no, const char* title, const char* format, ...); 4805 4806 const char * signames[] = { 4807 "SIG0", 4808 "SIGHUP", "SIGINT", "SIGQUIT", "SIGILL", "SIGTRAP", 4809 "SIGABRT", "SIGEMT", "SIGFPE", "SIGKILL", "SIGBUS", 4810 "SIGSEGV", "SIGSYS", "SIGPIPE", "SIGALRM", "SIGTERM", 4811 "SIGUSR1", "SIGUSR2", "SIGCLD", "SIGPWR", "SIGWINCH", 4812 "SIGURG", "SIGPOLL", "SIGSTOP", "SIGTSTP", "SIGCONT", 4813 "SIGTTIN", "SIGTTOU", "SIGVTALRM", "SIGPROF", "SIGXCPU", 4814 "SIGXFSZ", "SIGWAITING", "SIGLWP", "SIGFREEZE", "SIGTHAW", 4815 "SIGCANCEL", "SIGLOST" 4816 }; 4817 4818 const char* os::exception_name(int exception_code, char* buf, size_t size) { 4819 if (0 < exception_code && exception_code <= SIGRTMAX) { 4820 // signal 4821 if (exception_code < sizeof(signames)/sizeof(const char*)) { 4822 jio_snprintf(buf, size, "%s", signames[exception_code]); 4823 } else { 4824 jio_snprintf(buf, size, "SIG%d", exception_code); 4825 } 4826 return buf; 4827 } else { 4828 return NULL; 4829 } 4830 } 4831 4832 // (Static) wrappers for the new libthread API 4833 int_fnP_thread_t_iP_uP_stack_tP_gregset_t os::Solaris::_thr_getstate; 4834 int_fnP_thread_t_i_gregset_t os::Solaris::_thr_setstate; 4835 int_fnP_thread_t_i os::Solaris::_thr_setmutator; 4836 int_fnP_thread_t os::Solaris::_thr_suspend_mutator; 4837 int_fnP_thread_t os::Solaris::_thr_continue_mutator; 4838 4839 // (Static) wrapper for getisax(2) call. 4840 os::Solaris::getisax_func_t os::Solaris::_getisax = 0; 4841 4842 // (Static) wrappers for the liblgrp API 4843 os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home; 4844 os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init; 4845 os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini; 4846 os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root; 4847 os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children; 4848 os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources; 4849 os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps; 4850 os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale; 4851 os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0; 4852 4853 // (Static) wrapper for meminfo() call. 4854 os::Solaris::meminfo_func_t os::Solaris::_meminfo = 0; 4855 4856 static address resolve_symbol_lazy(const char* name) { 4857 address addr = (address) dlsym(RTLD_DEFAULT, name); 4858 if(addr == NULL) { 4859 // RTLD_DEFAULT was not defined on some early versions of 2.5.1 4860 addr = (address) dlsym(RTLD_NEXT, name); 4861 } 4862 return addr; 4863 } 4864 4865 static address resolve_symbol(const char* name) { 4866 address addr = resolve_symbol_lazy(name); 4867 if(addr == NULL) { 4868 fatal(dlerror()); 4869 } 4870 return addr; 4871 } 4872 4873 4874 4875 // isT2_libthread() 4876 // 4877 // Routine to determine if we are currently using the new T2 libthread. 4878 // 4879 // We determine if we are using T2 by reading /proc/self/lstatus and 4880 // looking for a thread with the ASLWP bit set. If we find this status 4881 // bit set, we must assume that we are NOT using T2. The T2 team 4882 // has approved this algorithm. 4883 // 4884 // We need to determine if we are running with the new T2 libthread 4885 // since setting native thread priorities is handled differently 4886 // when using this library. All threads created using T2 are bound 4887 // threads. Calling thr_setprio is meaningless in this case. 4888 // 4889 bool isT2_libthread() { 4890 static prheader_t * lwpArray = NULL; 4891 static int lwpSize = 0; 4892 static int lwpFile = -1; 4893 lwpstatus_t * that; 4894 char lwpName [128]; 4895 bool isT2 = false; 4896 4897 #define ADR(x) ((uintptr_t)(x)) 4898 #define LWPINDEX(ary,ix) ((lwpstatus_t *)(((ary)->pr_entsize * (ix)) + (ADR((ary) + 1)))) 4899 4900 lwpFile = ::open("/proc/self/lstatus", O_RDONLY, 0); 4901 if (lwpFile < 0) { 4902 if (ThreadPriorityVerbose) warning ("Couldn't open /proc/self/lstatus\n"); 4903 return false; 4904 } 4905 lwpSize = 16*1024; 4906 for (;;) { 4907 ::lseek64 (lwpFile, 0, SEEK_SET); 4908 lwpArray = (prheader_t *)NEW_C_HEAP_ARRAY(char, lwpSize, mtInternal); 4909 if (::read(lwpFile, lwpArray, lwpSize) < 0) { 4910 if (ThreadPriorityVerbose) warning("Error reading /proc/self/lstatus\n"); 4911 break; 4912 } 4913 if ((lwpArray->pr_nent * lwpArray->pr_entsize) <= lwpSize) { 4914 // We got a good snapshot - now iterate over the list. 4915 int aslwpcount = 0; 4916 for (int i = 0; i < lwpArray->pr_nent; i++ ) { 4917 that = LWPINDEX(lwpArray,i); 4918 if (that->pr_flags & PR_ASLWP) { 4919 aslwpcount++; 4920 } 4921 } 4922 if (aslwpcount == 0) isT2 = true; 4923 break; 4924 } 4925 lwpSize = lwpArray->pr_nent * lwpArray->pr_entsize; 4926 FREE_C_HEAP_ARRAY(char, lwpArray, mtInternal); // retry. 4927 } 4928 4929 FREE_C_HEAP_ARRAY(char, lwpArray, mtInternal); 4930 ::close (lwpFile); 4931 if (ThreadPriorityVerbose) { 4932 if (isT2) tty->print_cr("We are running with a T2 libthread\n"); 4933 else tty->print_cr("We are not running with a T2 libthread\n"); 4934 } 4935 return isT2; 4936 } 4937 4938 4939 void os::Solaris::libthread_init() { 4940 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators"); 4941 4942 // Determine if we are running with the new T2 libthread 4943 os::Solaris::set_T2_libthread(isT2_libthread()); 4944 4945 lwp_priocntl_init(); 4946 4947 // RTLD_DEFAULT was not defined on some early versions of 5.5.1 4948 if(func == NULL) { 4949 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators"); 4950 // Guarantee that this VM is running on an new enough OS (5.6 or 4951 // later) that it will have a new enough libthread.so. 4952 guarantee(func != NULL, "libthread.so is too old."); 4953 } 4954 4955 // Initialize the new libthread getstate API wrappers 4956 func = resolve_symbol("thr_getstate"); 4957 os::Solaris::set_thr_getstate(CAST_TO_FN_PTR(int_fnP_thread_t_iP_uP_stack_tP_gregset_t, func)); 4958 4959 func = resolve_symbol("thr_setstate"); 4960 os::Solaris::set_thr_setstate(CAST_TO_FN_PTR(int_fnP_thread_t_i_gregset_t, func)); 4961 4962 func = resolve_symbol("thr_setmutator"); 4963 os::Solaris::set_thr_setmutator(CAST_TO_FN_PTR(int_fnP_thread_t_i, func)); 4964 4965 func = resolve_symbol("thr_suspend_mutator"); 4966 os::Solaris::set_thr_suspend_mutator(CAST_TO_FN_PTR(int_fnP_thread_t, func)); 4967 4968 func = resolve_symbol("thr_continue_mutator"); 4969 os::Solaris::set_thr_continue_mutator(CAST_TO_FN_PTR(int_fnP_thread_t, func)); 4970 4971 int size; 4972 void (*handler_info_func)(address *, int *); 4973 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo")); 4974 handler_info_func(&handler_start, &size); 4975 handler_end = handler_start + size; 4976 } 4977 4978 4979 int_fnP_mutex_tP os::Solaris::_mutex_lock; 4980 int_fnP_mutex_tP os::Solaris::_mutex_trylock; 4981 int_fnP_mutex_tP os::Solaris::_mutex_unlock; 4982 int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init; 4983 int_fnP_mutex_tP os::Solaris::_mutex_destroy; 4984 int os::Solaris::_mutex_scope = USYNC_THREAD; 4985 4986 int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait; 4987 int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait; 4988 int_fnP_cond_tP os::Solaris::_cond_signal; 4989 int_fnP_cond_tP os::Solaris::_cond_broadcast; 4990 int_fnP_cond_tP_i_vP os::Solaris::_cond_init; 4991 int_fnP_cond_tP os::Solaris::_cond_destroy; 4992 int os::Solaris::_cond_scope = USYNC_THREAD; 4993 4994 void os::Solaris::synchronization_init() { 4995 if(UseLWPSynchronization) { 4996 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock"))); 4997 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock"))); 4998 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock"))); 4999 os::Solaris::set_mutex_init(lwp_mutex_init); 5000 os::Solaris::set_mutex_destroy(lwp_mutex_destroy); 5001 os::Solaris::set_mutex_scope(USYNC_THREAD); 5002 5003 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait"))); 5004 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait"))); 5005 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal"))); 5006 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast"))); 5007 os::Solaris::set_cond_init(lwp_cond_init); 5008 os::Solaris::set_cond_destroy(lwp_cond_destroy); 5009 os::Solaris::set_cond_scope(USYNC_THREAD); 5010 } 5011 else { 5012 os::Solaris::set_mutex_scope(USYNC_THREAD); 5013 os::Solaris::set_cond_scope(USYNC_THREAD); 5014 5015 if(UsePthreads) { 5016 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock"))); 5017 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock"))); 5018 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock"))); 5019 os::Solaris::set_mutex_init(pthread_mutex_default_init); 5020 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy"))); 5021 5022 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait"))); 5023 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait"))); 5024 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal"))); 5025 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast"))); 5026 os::Solaris::set_cond_init(pthread_cond_default_init); 5027 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy"))); 5028 } 5029 else { 5030 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock"))); 5031 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock"))); 5032 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock"))); 5033 os::Solaris::set_mutex_init(::mutex_init); 5034 os::Solaris::set_mutex_destroy(::mutex_destroy); 5035 5036 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait"))); 5037 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait"))); 5038 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal"))); 5039 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast"))); 5040 os::Solaris::set_cond_init(::cond_init); 5041 os::Solaris::set_cond_destroy(::cond_destroy); 5042 } 5043 } 5044 } 5045 5046 bool os::Solaris::liblgrp_init() { 5047 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY); 5048 if (handle != NULL) { 5049 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home"))); 5050 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init"))); 5051 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini"))); 5052 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root"))); 5053 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children"))); 5054 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources"))); 5055 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps"))); 5056 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t, 5057 dlsym(handle, "lgrp_cookie_stale"))); 5058 5059 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER); 5060 set_lgrp_cookie(c); 5061 return true; 5062 } 5063 return false; 5064 } 5065 5066 void os::Solaris::misc_sym_init() { 5067 address func; 5068 5069 // getisax 5070 func = resolve_symbol_lazy("getisax"); 5071 if (func != NULL) { 5072 os::Solaris::_getisax = CAST_TO_FN_PTR(getisax_func_t, func); 5073 } 5074 5075 // meminfo 5076 func = resolve_symbol_lazy("meminfo"); 5077 if (func != NULL) { 5078 os::Solaris::set_meminfo(CAST_TO_FN_PTR(meminfo_func_t, func)); 5079 } 5080 } 5081 5082 uint_t os::Solaris::getisax(uint32_t* array, uint_t n) { 5083 assert(_getisax != NULL, "_getisax not set"); 5084 return _getisax(array, n); 5085 } 5086 5087 // int pset_getloadavg(psetid_t pset, double loadavg[], int nelem); 5088 typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem); 5089 static pset_getloadavg_type pset_getloadavg_ptr = NULL; 5090 5091 void init_pset_getloadavg_ptr(void) { 5092 pset_getloadavg_ptr = 5093 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg"); 5094 if (PrintMiscellaneous && Verbose && pset_getloadavg_ptr == NULL) { 5095 warning("pset_getloadavg function not found"); 5096 } 5097 } 5098 5099 int os::Solaris::_dev_zero_fd = -1; 5100 5101 // this is called _before_ the global arguments have been parsed 5102 void os::init(void) { 5103 _initial_pid = getpid(); 5104 5105 max_hrtime = first_hrtime = gethrtime(); 5106 5107 init_random(1234567); 5108 5109 page_size = sysconf(_SC_PAGESIZE); 5110 if (page_size == -1) 5111 fatal(err_msg("os_solaris.cpp: os::init: sysconf failed (%s)", 5112 strerror(errno))); 5113 init_page_sizes((size_t) page_size); 5114 5115 Solaris::initialize_system_info(); 5116 5117 // Initialize misc. symbols as soon as possible, so we can use them 5118 // if we need them. 5119 Solaris::misc_sym_init(); 5120 5121 int fd = ::open("/dev/zero", O_RDWR); 5122 if (fd < 0) { 5123 fatal(err_msg("os::init: cannot open /dev/zero (%s)", strerror(errno))); 5124 } else { 5125 Solaris::set_dev_zero_fd(fd); 5126 5127 // Close on exec, child won't inherit. 5128 fcntl(fd, F_SETFD, FD_CLOEXEC); 5129 } 5130 5131 clock_tics_per_sec = CLK_TCK; 5132 5133 // check if dladdr1() exists; dladdr1 can provide more information than 5134 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9 5135 // and is available on linker patches for 5.7 and 5.8. 5136 // libdl.so must have been loaded, this call is just an entry lookup 5137 void * hdl = dlopen("libdl.so", RTLD_NOW); 5138 if (hdl) 5139 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1")); 5140 5141 // (Solaris only) this switches to calls that actually do locking. 5142 ThreadCritical::initialize(); 5143 5144 main_thread = thr_self(); 5145 5146 // Constant minimum stack size allowed. It must be at least 5147 // the minimum of what the OS supports (thr_min_stack()), and 5148 // enough to allow the thread to get to user bytecode execution. 5149 Solaris::min_stack_allowed = MAX2(thr_min_stack(), Solaris::min_stack_allowed); 5150 // If the pagesize of the VM is greater than 8K determine the appropriate 5151 // number of initial guard pages. The user can change this with the 5152 // command line arguments, if needed. 5153 if (vm_page_size() > 8*K) { 5154 StackYellowPages = 1; 5155 StackRedPages = 1; 5156 StackShadowPages = round_to((StackShadowPages*8*K), vm_page_size()) / vm_page_size(); 5157 } 5158 } 5159 5160 // To install functions for atexit system call 5161 extern "C" { 5162 static void perfMemory_exit_helper() { 5163 perfMemory_exit(); 5164 } 5165 } 5166 5167 // this is called _after_ the global arguments have been parsed 5168 jint os::init_2(void) { 5169 // try to enable extended file IO ASAP, see 6431278 5170 os::Solaris::try_enable_extended_io(); 5171 5172 // Allocate a single page and mark it as readable for safepoint polling. Also 5173 // use this first mmap call to check support for MAP_ALIGN. 5174 address polling_page = (address)Solaris::mmap_chunk((char*)page_size, 5175 page_size, 5176 MAP_PRIVATE | MAP_ALIGN, 5177 PROT_READ); 5178 if (polling_page == NULL) { 5179 has_map_align = false; 5180 polling_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE, 5181 PROT_READ); 5182 } 5183 5184 os::set_polling_page(polling_page); 5185 5186 #ifndef PRODUCT 5187 if( Verbose && PrintMiscellaneous ) 5188 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); 5189 #endif 5190 5191 if (!UseMembar) { 5192 address mem_serialize_page = (address)Solaris::mmap_chunk( NULL, page_size, MAP_PRIVATE, PROT_READ | PROT_WRITE ); 5193 guarantee( mem_serialize_page != NULL, "mmap Failed for memory serialize page"); 5194 os::set_memory_serialize_page( mem_serialize_page ); 5195 5196 #ifndef PRODUCT 5197 if(Verbose && PrintMiscellaneous) 5198 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); 5199 #endif 5200 } 5201 5202 // Check minimum allowable stack size for thread creation and to initialize 5203 // the java system classes, including StackOverflowError - depends on page 5204 // size. Add a page for compiler2 recursion in main thread. 5205 // Add in 2*BytesPerWord times page size to account for VM stack during 5206 // class initialization depending on 32 or 64 bit VM. 5207 os::Solaris::min_stack_allowed = MAX2(os::Solaris::min_stack_allowed, 5208 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+ 5209 2*BytesPerWord COMPILER2_PRESENT(+1)) * page_size); 5210 5211 size_t threadStackSizeInBytes = ThreadStackSize * K; 5212 if (threadStackSizeInBytes != 0 && 5213 threadStackSizeInBytes < os::Solaris::min_stack_allowed) { 5214 tty->print_cr("\nThe stack size specified is too small, Specify at least %dk", 5215 os::Solaris::min_stack_allowed/K); 5216 return JNI_ERR; 5217 } 5218 5219 // For 64kbps there will be a 64kb page size, which makes 5220 // the usable default stack size quite a bit less. Increase the 5221 // stack for 64kb (or any > than 8kb) pages, this increases 5222 // virtual memory fragmentation (since we're not creating the 5223 // stack on a power of 2 boundary. The real fix for this 5224 // should be to fix the guard page mechanism. 5225 5226 if (vm_page_size() > 8*K) { 5227 threadStackSizeInBytes = (threadStackSizeInBytes != 0) 5228 ? threadStackSizeInBytes + 5229 ((StackYellowPages + StackRedPages) * vm_page_size()) 5230 : 0; 5231 ThreadStackSize = threadStackSizeInBytes/K; 5232 } 5233 5234 // Make the stack size a multiple of the page size so that 5235 // the yellow/red zones can be guarded. 5236 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, 5237 vm_page_size())); 5238 5239 Solaris::libthread_init(); 5240 5241 if (UseNUMA) { 5242 if (!Solaris::liblgrp_init()) { 5243 UseNUMA = false; 5244 } else { 5245 size_t lgrp_limit = os::numa_get_groups_num(); 5246 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtInternal); 5247 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit); 5248 FREE_C_HEAP_ARRAY(int, lgrp_ids, mtInternal); 5249 if (lgrp_num < 2) { 5250 // There's only one locality group, disable NUMA. 5251 UseNUMA = false; 5252 } 5253 } 5254 if (!UseNUMA && ForceNUMA) { 5255 UseNUMA = true; 5256 } 5257 } 5258 5259 Solaris::signal_sets_init(); 5260 Solaris::init_signal_mem(); 5261 Solaris::install_signal_handlers(); 5262 5263 if (libjsigversion < JSIG_VERSION_1_4_1) { 5264 Maxlibjsigsigs = OLDMAXSIGNUM; 5265 } 5266 5267 // initialize synchronization primitives to use either thread or 5268 // lwp synchronization (controlled by UseLWPSynchronization) 5269 Solaris::synchronization_init(); 5270 5271 if (MaxFDLimit) { 5272 // set the number of file descriptors to max. print out error 5273 // if getrlimit/setrlimit fails but continue regardless. 5274 struct rlimit nbr_files; 5275 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 5276 if (status != 0) { 5277 if (PrintMiscellaneous && (Verbose || WizardMode)) 5278 perror("os::init_2 getrlimit failed"); 5279 } else { 5280 nbr_files.rlim_cur = nbr_files.rlim_max; 5281 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 5282 if (status != 0) { 5283 if (PrintMiscellaneous && (Verbose || WizardMode)) 5284 perror("os::init_2 setrlimit failed"); 5285 } 5286 } 5287 } 5288 5289 // Calculate theoretical max. size of Threads to guard gainst 5290 // artifical out-of-memory situations, where all available address- 5291 // space has been reserved by thread stacks. Default stack size is 1Mb. 5292 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ? 5293 JavaThread::stack_size_at_create() : (1*K*K); 5294 assert(pre_thread_stack_size != 0, "Must have a stack"); 5295 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when 5296 // we should start doing Virtual Memory banging. Currently when the threads will 5297 // have used all but 200Mb of space. 5298 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K); 5299 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size; 5300 5301 // at-exit methods are called in the reverse order of their registration. 5302 // In Solaris 7 and earlier, atexit functions are called on return from 5303 // main or as a result of a call to exit(3C). There can be only 32 of 5304 // these functions registered and atexit() does not set errno. In Solaris 5305 // 8 and later, there is no limit to the number of functions registered 5306 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit 5307 // functions are called upon dlclose(3DL) in addition to return from main 5308 // and exit(3C). 5309 5310 if (PerfAllowAtExitRegistration) { 5311 // only register atexit functions if PerfAllowAtExitRegistration is set. 5312 // atexit functions can be delayed until process exit time, which 5313 // can be problematic for embedded VM situations. Embedded VMs should 5314 // call DestroyJavaVM() to assure that VM resources are released. 5315 5316 // note: perfMemory_exit_helper atexit function may be removed in 5317 // the future if the appropriate cleanup code can be added to the 5318 // VM_Exit VMOperation's doit method. 5319 if (atexit(perfMemory_exit_helper) != 0) { 5320 warning("os::init2 atexit(perfMemory_exit_helper) failed"); 5321 } 5322 } 5323 5324 // Init pset_loadavg function pointer 5325 init_pset_getloadavg_ptr(); 5326 5327 return JNI_OK; 5328 } 5329 5330 void os::init_3(void) { 5331 return; 5332 } 5333 5334 // Mark the polling page as unreadable 5335 void os::make_polling_page_unreadable(void) { 5336 if( mprotect((char *)_polling_page, page_size, PROT_NONE) != 0 ) 5337 fatal("Could not disable polling page"); 5338 }; 5339 5340 // Mark the polling page as readable 5341 void os::make_polling_page_readable(void) { 5342 if( mprotect((char *)_polling_page, page_size, PROT_READ) != 0 ) 5343 fatal("Could not enable polling page"); 5344 }; 5345 5346 // OS interface. 5347 5348 bool os::check_heap(bool force) { return true; } 5349 5350 typedef int (*vsnprintf_t)(char* buf, size_t count, const char* fmt, va_list argptr); 5351 static vsnprintf_t sol_vsnprintf = NULL; 5352 5353 int local_vsnprintf(char* buf, size_t count, const char* fmt, va_list argptr) { 5354 if (!sol_vsnprintf) { 5355 //search for the named symbol in the objects that were loaded after libjvm 5356 void* where = RTLD_NEXT; 5357 if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL) 5358 sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf")); 5359 if (!sol_vsnprintf){ 5360 //search for the named symbol in the objects that were loaded before libjvm 5361 where = RTLD_DEFAULT; 5362 if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL) 5363 sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf")); 5364 assert(sol_vsnprintf != NULL, "vsnprintf not found"); 5365 } 5366 } 5367 return (*sol_vsnprintf)(buf, count, fmt, argptr); 5368 } 5369 5370 5371 // Is a (classpath) directory empty? 5372 bool os::dir_is_empty(const char* path) { 5373 DIR *dir = NULL; 5374 struct dirent *ptr; 5375 5376 dir = opendir(path); 5377 if (dir == NULL) return true; 5378 5379 /* Scan the directory */ 5380 bool result = true; 5381 char buf[sizeof(struct dirent) + MAX_PATH]; 5382 struct dirent *dbuf = (struct dirent *) buf; 5383 while (result && (ptr = readdir(dir, dbuf)) != NULL) { 5384 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 5385 result = false; 5386 } 5387 } 5388 closedir(dir); 5389 return result; 5390 } 5391 5392 // This code originates from JDK's sysOpen and open64_w 5393 // from src/solaris/hpi/src/system_md.c 5394 5395 #ifndef O_DELETE 5396 #define O_DELETE 0x10000 5397 #endif 5398 5399 // Open a file. Unlink the file immediately after open returns 5400 // if the specified oflag has the O_DELETE flag set. 5401 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c 5402 5403 int os::open(const char *path, int oflag, int mode) { 5404 if (strlen(path) > MAX_PATH - 1) { 5405 errno = ENAMETOOLONG; 5406 return -1; 5407 } 5408 int fd; 5409 int o_delete = (oflag & O_DELETE); 5410 oflag = oflag & ~O_DELETE; 5411 5412 fd = ::open64(path, oflag, mode); 5413 if (fd == -1) return -1; 5414 5415 //If the open succeeded, the file might still be a directory 5416 { 5417 struct stat64 buf64; 5418 int ret = ::fstat64(fd, &buf64); 5419 int st_mode = buf64.st_mode; 5420 5421 if (ret != -1) { 5422 if ((st_mode & S_IFMT) == S_IFDIR) { 5423 errno = EISDIR; 5424 ::close(fd); 5425 return -1; 5426 } 5427 } else { 5428 ::close(fd); 5429 return -1; 5430 } 5431 } 5432 /* 5433 * 32-bit Solaris systems suffer from: 5434 * 5435 * - an historical default soft limit of 256 per-process file 5436 * descriptors that is too low for many Java programs. 5437 * 5438 * - a design flaw where file descriptors created using stdio 5439 * fopen must be less than 256, _even_ when the first limit above 5440 * has been raised. This can cause calls to fopen (but not calls to 5441 * open, for example) to fail mysteriously, perhaps in 3rd party 5442 * native code (although the JDK itself uses fopen). One can hardly 5443 * criticize them for using this most standard of all functions. 5444 * 5445 * We attempt to make everything work anyways by: 5446 * 5447 * - raising the soft limit on per-process file descriptors beyond 5448 * 256 5449 * 5450 * - As of Solaris 10u4, we can request that Solaris raise the 256 5451 * stdio fopen limit by calling function enable_extended_FILE_stdio. 5452 * This is done in init_2 and recorded in enabled_extended_FILE_stdio 5453 * 5454 * - If we are stuck on an old (pre 10u4) Solaris system, we can 5455 * workaround the bug by remapping non-stdio file descriptors below 5456 * 256 to ones beyond 256, which is done below. 5457 * 5458 * See: 5459 * 1085341: 32-bit stdio routines should support file descriptors >255 5460 * 6533291: Work around 32-bit Solaris stdio limit of 256 open files 5461 * 6431278: Netbeans crash on 32 bit Solaris: need to call 5462 * enable_extended_FILE_stdio() in VM initialisation 5463 * Giri Mandalika's blog 5464 * http://technopark02.blogspot.com/2005_05_01_archive.html 5465 */ 5466 #ifndef _LP64 5467 if ((!enabled_extended_FILE_stdio) && fd < 256) { 5468 int newfd = ::fcntl(fd, F_DUPFD, 256); 5469 if (newfd != -1) { 5470 ::close(fd); 5471 fd = newfd; 5472 } 5473 } 5474 #endif // 32-bit Solaris 5475 /* 5476 * All file descriptors that are opened in the JVM and not 5477 * specifically destined for a subprocess should have the 5478 * close-on-exec flag set. If we don't set it, then careless 3rd 5479 * party native code might fork and exec without closing all 5480 * appropriate file descriptors (e.g. as we do in closeDescriptors in 5481 * UNIXProcess.c), and this in turn might: 5482 * 5483 * - cause end-of-file to fail to be detected on some file 5484 * descriptors, resulting in mysterious hangs, or 5485 * 5486 * - might cause an fopen in the subprocess to fail on a system 5487 * suffering from bug 1085341. 5488 * 5489 * (Yes, the default setting of the close-on-exec flag is a Unix 5490 * design flaw) 5491 * 5492 * See: 5493 * 1085341: 32-bit stdio routines should support file descriptors >255 5494 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed 5495 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 5496 */ 5497 #ifdef FD_CLOEXEC 5498 { 5499 int flags = ::fcntl(fd, F_GETFD); 5500 if (flags != -1) 5501 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); 5502 } 5503 #endif 5504 5505 if (o_delete != 0) { 5506 ::unlink(path); 5507 } 5508 return fd; 5509 } 5510 5511 // create binary file, rewriting existing file if required 5512 int os::create_binary_file(const char* path, bool rewrite_existing) { 5513 int oflags = O_WRONLY | O_CREAT; 5514 if (!rewrite_existing) { 5515 oflags |= O_EXCL; 5516 } 5517 return ::open64(path, oflags, S_IREAD | S_IWRITE); 5518 } 5519 5520 // return current position of file pointer 5521 jlong os::current_file_offset(int fd) { 5522 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR); 5523 } 5524 5525 // move file pointer to the specified offset 5526 jlong os::seek_to_file_offset(int fd, jlong offset) { 5527 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET); 5528 } 5529 5530 jlong os::lseek(int fd, jlong offset, int whence) { 5531 return (jlong) ::lseek64(fd, offset, whence); 5532 } 5533 5534 char * os::native_path(char *path) { 5535 return path; 5536 } 5537 5538 int os::ftruncate(int fd, jlong length) { 5539 return ::ftruncate64(fd, length); 5540 } 5541 5542 int os::fsync(int fd) { 5543 RESTARTABLE_RETURN_INT(::fsync(fd)); 5544 } 5545 5546 int os::available(int fd, jlong *bytes) { 5547 jlong cur, end; 5548 int mode; 5549 struct stat64 buf64; 5550 5551 if (::fstat64(fd, &buf64) >= 0) { 5552 mode = buf64.st_mode; 5553 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 5554 /* 5555 * XXX: is the following call interruptible? If so, this might 5556 * need to go through the INTERRUPT_IO() wrapper as for other 5557 * blocking, interruptible calls in this file. 5558 */ 5559 int n,ioctl_return; 5560 5561 INTERRUPTIBLE(::ioctl(fd, FIONREAD, &n),ioctl_return,os::Solaris::clear_interrupted); 5562 if (ioctl_return>= 0) { 5563 *bytes = n; 5564 return 1; 5565 } 5566 } 5567 } 5568 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) { 5569 return 0; 5570 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) { 5571 return 0; 5572 } else if (::lseek64(fd, cur, SEEK_SET) == -1) { 5573 return 0; 5574 } 5575 *bytes = end - cur; 5576 return 1; 5577 } 5578 5579 // Map a block of memory. 5580 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 5581 char *addr, size_t bytes, bool read_only, 5582 bool allow_exec) { 5583 int prot; 5584 int flags; 5585 5586 if (read_only) { 5587 prot = PROT_READ; 5588 flags = MAP_SHARED; 5589 } else { 5590 prot = PROT_READ | PROT_WRITE; 5591 flags = MAP_PRIVATE; 5592 } 5593 5594 if (allow_exec) { 5595 prot |= PROT_EXEC; 5596 } 5597 5598 if (addr != NULL) { 5599 flags |= MAP_FIXED; 5600 } 5601 5602 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, 5603 fd, file_offset); 5604 if (mapped_address == MAP_FAILED) { 5605 return NULL; 5606 } 5607 return mapped_address; 5608 } 5609 5610 5611 // Remap a block of memory. 5612 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 5613 char *addr, size_t bytes, bool read_only, 5614 bool allow_exec) { 5615 // same as map_memory() on this OS 5616 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 5617 allow_exec); 5618 } 5619 5620 5621 // Unmap a block of memory. 5622 bool os::pd_unmap_memory(char* addr, size_t bytes) { 5623 return munmap(addr, bytes) == 0; 5624 } 5625 5626 void os::pause() { 5627 char filename[MAX_PATH]; 5628 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 5629 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 5630 } else { 5631 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 5632 } 5633 5634 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 5635 if (fd != -1) { 5636 struct stat buf; 5637 ::close(fd); 5638 while (::stat(filename, &buf) == 0) { 5639 (void)::poll(NULL, 0, 100); 5640 } 5641 } else { 5642 jio_fprintf(stderr, 5643 "Could not open pause file '%s', continuing immediately.\n", filename); 5644 } 5645 } 5646 5647 #ifndef PRODUCT 5648 #ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS 5649 // Turn this on if you need to trace synch operations. 5650 // Set RECORD_SYNCH_LIMIT to a large-enough value, 5651 // and call record_synch_enable and record_synch_disable 5652 // around the computation of interest. 5653 5654 void record_synch(char* name, bool returning); // defined below 5655 5656 class RecordSynch { 5657 char* _name; 5658 public: 5659 RecordSynch(char* name) :_name(name) 5660 { record_synch(_name, false); } 5661 ~RecordSynch() { record_synch(_name, true); } 5662 }; 5663 5664 #define CHECK_SYNCH_OP(ret, name, params, args, inner) \ 5665 extern "C" ret name params { \ 5666 typedef ret name##_t params; \ 5667 static name##_t* implem = NULL; \ 5668 static int callcount = 0; \ 5669 if (implem == NULL) { \ 5670 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \ 5671 if (implem == NULL) fatal(dlerror()); \ 5672 } \ 5673 ++callcount; \ 5674 RecordSynch _rs(#name); \ 5675 inner; \ 5676 return implem args; \ 5677 } 5678 // in dbx, examine callcounts this way: 5679 // for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done 5680 5681 #define CHECK_POINTER_OK(p) \ 5682 (!Universe::is_fully_initialized() || !Universe::is_reserved_heap((oop)(p))) 5683 #define CHECK_MU \ 5684 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only."); 5685 #define CHECK_CV \ 5686 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only."); 5687 #define CHECK_P(p) \ 5688 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only."); 5689 5690 #define CHECK_MUTEX(mutex_op) \ 5691 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU); 5692 5693 CHECK_MUTEX( mutex_lock) 5694 CHECK_MUTEX( _mutex_lock) 5695 CHECK_MUTEX( mutex_unlock) 5696 CHECK_MUTEX(_mutex_unlock) 5697 CHECK_MUTEX( mutex_trylock) 5698 CHECK_MUTEX(_mutex_trylock) 5699 5700 #define CHECK_COND(cond_op) \ 5701 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU;CHECK_CV); 5702 5703 CHECK_COND( cond_wait); 5704 CHECK_COND(_cond_wait); 5705 CHECK_COND(_cond_wait_cancel); 5706 5707 #define CHECK_COND2(cond_op) \ 5708 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU;CHECK_CV); 5709 5710 CHECK_COND2( cond_timedwait); 5711 CHECK_COND2(_cond_timedwait); 5712 CHECK_COND2(_cond_timedwait_cancel); 5713 5714 // do the _lwp_* versions too 5715 #define mutex_t lwp_mutex_t 5716 #define cond_t lwp_cond_t 5717 CHECK_MUTEX( _lwp_mutex_lock) 5718 CHECK_MUTEX( _lwp_mutex_unlock) 5719 CHECK_MUTEX( _lwp_mutex_trylock) 5720 CHECK_MUTEX( __lwp_mutex_lock) 5721 CHECK_MUTEX( __lwp_mutex_unlock) 5722 CHECK_MUTEX( __lwp_mutex_trylock) 5723 CHECK_MUTEX(___lwp_mutex_lock) 5724 CHECK_MUTEX(___lwp_mutex_unlock) 5725 5726 CHECK_COND( _lwp_cond_wait); 5727 CHECK_COND( __lwp_cond_wait); 5728 CHECK_COND(___lwp_cond_wait); 5729 5730 CHECK_COND2( _lwp_cond_timedwait); 5731 CHECK_COND2( __lwp_cond_timedwait); 5732 #undef mutex_t 5733 #undef cond_t 5734 5735 CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0); 5736 CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0); 5737 CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0); 5738 CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0); 5739 CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p)); 5740 CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p)); 5741 CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV); 5742 CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV); 5743 5744 5745 // recording machinery: 5746 5747 enum { RECORD_SYNCH_LIMIT = 200 }; 5748 char* record_synch_name[RECORD_SYNCH_LIMIT]; 5749 void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT]; 5750 bool record_synch_returning[RECORD_SYNCH_LIMIT]; 5751 thread_t record_synch_thread[RECORD_SYNCH_LIMIT]; 5752 int record_synch_count = 0; 5753 bool record_synch_enabled = false; 5754 5755 // in dbx, examine recorded data this way: 5756 // for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done 5757 5758 void record_synch(char* name, bool returning) { 5759 if (record_synch_enabled) { 5760 if (record_synch_count < RECORD_SYNCH_LIMIT) { 5761 record_synch_name[record_synch_count] = name; 5762 record_synch_returning[record_synch_count] = returning; 5763 record_synch_thread[record_synch_count] = thr_self(); 5764 record_synch_arg0ptr[record_synch_count] = &name; 5765 record_synch_count++; 5766 } 5767 // put more checking code here: 5768 // ... 5769 } 5770 } 5771 5772 void record_synch_enable() { 5773 // start collecting trace data, if not already doing so 5774 if (!record_synch_enabled) record_synch_count = 0; 5775 record_synch_enabled = true; 5776 } 5777 5778 void record_synch_disable() { 5779 // stop collecting trace data 5780 record_synch_enabled = false; 5781 } 5782 5783 #endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS 5784 #endif // PRODUCT 5785 5786 const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime); 5787 const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) - 5788 (intptr_t)(&((prusage_t *)(NULL))->pr_utime); 5789 5790 5791 // JVMTI & JVM monitoring and management support 5792 // The thread_cpu_time() and current_thread_cpu_time() are only 5793 // supported if is_thread_cpu_time_supported() returns true. 5794 // They are not supported on Solaris T1. 5795 5796 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 5797 // are used by JVM M&M and JVMTI to get user+sys or user CPU time 5798 // of a thread. 5799 // 5800 // current_thread_cpu_time() and thread_cpu_time(Thread *) 5801 // returns the fast estimate available on the platform. 5802 5803 // hrtime_t gethrvtime() return value includes 5804 // user time but does not include system time 5805 jlong os::current_thread_cpu_time() { 5806 return (jlong) gethrvtime(); 5807 } 5808 5809 jlong os::thread_cpu_time(Thread *thread) { 5810 // return user level CPU time only to be consistent with 5811 // what current_thread_cpu_time returns. 5812 // thread_cpu_time_info() must be changed if this changes 5813 return os::thread_cpu_time(thread, false /* user time only */); 5814 } 5815 5816 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 5817 if (user_sys_cpu_time) { 5818 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 5819 } else { 5820 return os::current_thread_cpu_time(); 5821 } 5822 } 5823 5824 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 5825 char proc_name[64]; 5826 int count; 5827 prusage_t prusage; 5828 jlong lwp_time; 5829 int fd; 5830 5831 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage", 5832 getpid(), 5833 thread->osthread()->lwp_id()); 5834 fd = ::open(proc_name, O_RDONLY); 5835 if ( fd == -1 ) return -1; 5836 5837 do { 5838 count = ::pread(fd, 5839 (void *)&prusage.pr_utime, 5840 thr_time_size, 5841 thr_time_off); 5842 } while (count < 0 && errno == EINTR); 5843 ::close(fd); 5844 if ( count < 0 ) return -1; 5845 5846 if (user_sys_cpu_time) { 5847 // user + system CPU time 5848 lwp_time = (((jlong)prusage.pr_stime.tv_sec + 5849 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) + 5850 (jlong)prusage.pr_stime.tv_nsec + 5851 (jlong)prusage.pr_utime.tv_nsec; 5852 } else { 5853 // user level CPU time only 5854 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) + 5855 (jlong)prusage.pr_utime.tv_nsec; 5856 } 5857 5858 return(lwp_time); 5859 } 5860 5861 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 5862 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 5863 info_ptr->may_skip_backward = false; // elapsed time not wall time 5864 info_ptr->may_skip_forward = false; // elapsed time not wall time 5865 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned 5866 } 5867 5868 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 5869 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 5870 info_ptr->may_skip_backward = false; // elapsed time not wall time 5871 info_ptr->may_skip_forward = false; // elapsed time not wall time 5872 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned 5873 } 5874 5875 bool os::is_thread_cpu_time_supported() { 5876 if ( os::Solaris::T2_libthread() || UseBoundThreads ) { 5877 return true; 5878 } else { 5879 return false; 5880 } 5881 } 5882 5883 // System loadavg support. Returns -1 if load average cannot be obtained. 5884 // Return the load average for our processor set if the primitive exists 5885 // (Solaris 9 and later). Otherwise just return system wide loadavg. 5886 int os::loadavg(double loadavg[], int nelem) { 5887 if (pset_getloadavg_ptr != NULL) { 5888 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem); 5889 } else { 5890 return ::getloadavg(loadavg, nelem); 5891 } 5892 } 5893 5894 //--------------------------------------------------------------------------------- 5895 5896 bool os::find(address addr, outputStream* st) { 5897 Dl_info dlinfo; 5898 memset(&dlinfo, 0, sizeof(dlinfo)); 5899 if (dladdr(addr, &dlinfo) != 0) { 5900 st->print(PTR_FORMAT ": ", addr); 5901 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) { 5902 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr); 5903 } else if (dlinfo.dli_fbase != NULL) 5904 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase); 5905 else 5906 st->print("<absolute address>"); 5907 if (dlinfo.dli_fname != NULL) { 5908 st->print(" in %s", dlinfo.dli_fname); 5909 } 5910 if (dlinfo.dli_fbase != NULL) { 5911 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); 5912 } 5913 st->cr(); 5914 5915 if (Verbose) { 5916 // decode some bytes around the PC 5917 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size()); 5918 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); 5919 address lowest = (address) dlinfo.dli_sname; 5920 if (!lowest) lowest = (address) dlinfo.dli_fbase; 5921 if (begin < lowest) begin = lowest; 5922 Dl_info dlinfo2; 5923 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr 5924 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) 5925 end = (address) dlinfo2.dli_saddr; 5926 Disassembler::decode(begin, end, st); 5927 } 5928 return true; 5929 } 5930 return false; 5931 } 5932 5933 // Following function has been added to support HotSparc's libjvm.so running 5934 // under Solaris production JDK 1.2.2 / 1.3.0. These came from 5935 // src/solaris/hpi/native_threads in the EVM codebase. 5936 // 5937 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release 5938 // libraries and should thus be removed. We will leave it behind for a while 5939 // until we no longer want to able to run on top of 1.3.0 Solaris production 5940 // JDK. See 4341971. 5941 5942 #define STACK_SLACK 0x800 5943 5944 extern "C" { 5945 intptr_t sysThreadAvailableStackWithSlack() { 5946 stack_t st; 5947 intptr_t retval, stack_top; 5948 retval = thr_stksegment(&st); 5949 assert(retval == 0, "incorrect return value from thr_stksegment"); 5950 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned"); 5951 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned"); 5952 stack_top=(intptr_t)st.ss_sp-st.ss_size; 5953 return ((intptr_t)&stack_top - stack_top - STACK_SLACK); 5954 } 5955 } 5956 5957 // ObjectMonitor park-unpark infrastructure ... 5958 // 5959 // We implement Solaris and Linux PlatformEvents with the 5960 // obvious condvar-mutex-flag triple. 5961 // Another alternative that works quite well is pipes: 5962 // Each PlatformEvent consists of a pipe-pair. 5963 // The thread associated with the PlatformEvent 5964 // calls park(), which reads from the input end of the pipe. 5965 // Unpark() writes into the other end of the pipe. 5966 // The write-side of the pipe must be set NDELAY. 5967 // Unfortunately pipes consume a large # of handles. 5968 // Native solaris lwp_park() and lwp_unpark() work nicely, too. 5969 // Using pipes for the 1st few threads might be workable, however. 5970 // 5971 // park() is permitted to return spuriously. 5972 // Callers of park() should wrap the call to park() in 5973 // an appropriate loop. A litmus test for the correct 5974 // usage of park is the following: if park() were modified 5975 // to immediately return 0 your code should still work, 5976 // albeit degenerating to a spin loop. 5977 // 5978 // An interesting optimization for park() is to use a trylock() 5979 // to attempt to acquire the mutex. If the trylock() fails 5980 // then we know that a concurrent unpark() operation is in-progress. 5981 // in that case the park() code could simply set _count to 0 5982 // and return immediately. The subsequent park() operation *might* 5983 // return immediately. That's harmless as the caller of park() is 5984 // expected to loop. By using trylock() we will have avoided a 5985 // avoided a context switch caused by contention on the per-thread mutex. 5986 // 5987 // TODO-FIXME: 5988 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the 5989 // objectmonitor implementation. 5990 // 2. Collapse the JSR166 parker event, and the 5991 // objectmonitor ParkEvent into a single "Event" construct. 5992 // 3. In park() and unpark() add: 5993 // assert (Thread::current() == AssociatedWith). 5994 // 4. add spurious wakeup injection on a -XX:EarlyParkReturn=N switch. 5995 // 1-out-of-N park() operations will return immediately. 5996 // 5997 // _Event transitions in park() 5998 // -1 => -1 : illegal 5999 // 1 => 0 : pass - return immediately 6000 // 0 => -1 : block 6001 // 6002 // _Event serves as a restricted-range semaphore. 6003 // 6004 // Another possible encoding of _Event would be with 6005 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits. 6006 // 6007 // TODO-FIXME: add DTRACE probes for: 6008 // 1. Tx parks 6009 // 2. Ty unparks Tx 6010 // 3. Tx resumes from park 6011 6012 6013 // value determined through experimentation 6014 #define ROUNDINGFIX 11 6015 6016 // utility to compute the abstime argument to timedwait. 6017 // TODO-FIXME: switch from compute_abstime() to unpackTime(). 6018 6019 static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) { 6020 // millis is the relative timeout time 6021 // abstime will be the absolute timeout time 6022 if (millis < 0) millis = 0; 6023 struct timeval now; 6024 int status = gettimeofday(&now, NULL); 6025 assert(status == 0, "gettimeofday"); 6026 jlong seconds = millis / 1000; 6027 jlong max_wait_period; 6028 6029 if (UseLWPSynchronization) { 6030 // forward port of fix for 4275818 (not sleeping long enough) 6031 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where 6032 // _lwp_cond_timedwait() used a round_down algorithm rather 6033 // than a round_up. For millis less than our roundfactor 6034 // it rounded down to 0 which doesn't meet the spec. 6035 // For millis > roundfactor we may return a bit sooner, but 6036 // since we can not accurately identify the patch level and 6037 // this has already been fixed in Solaris 9 and 8 we will 6038 // leave it alone rather than always rounding down. 6039 6040 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX; 6041 // It appears that when we go directly through Solaris _lwp_cond_timedwait() 6042 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6 6043 max_wait_period = 21000000; 6044 } else { 6045 max_wait_period = 50000000; 6046 } 6047 millis %= 1000; 6048 if (seconds > max_wait_period) { // see man cond_timedwait(3T) 6049 seconds = max_wait_period; 6050 } 6051 abstime->tv_sec = now.tv_sec + seconds; 6052 long usec = now.tv_usec + millis * 1000; 6053 if (usec >= 1000000) { 6054 abstime->tv_sec += 1; 6055 usec -= 1000000; 6056 } 6057 abstime->tv_nsec = usec * 1000; 6058 return abstime; 6059 } 6060 6061 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately. 6062 // Conceptually TryPark() should be equivalent to park(0). 6063 6064 int os::PlatformEvent::TryPark() { 6065 for (;;) { 6066 const int v = _Event ; 6067 guarantee ((v == 0) || (v == 1), "invariant") ; 6068 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ; 6069 } 6070 } 6071 6072 void os::PlatformEvent::park() { // AKA: down() 6073 // Invariant: Only the thread associated with the Event/PlatformEvent 6074 // may call park(). 6075 int v ; 6076 for (;;) { 6077 v = _Event ; 6078 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 6079 } 6080 guarantee (v >= 0, "invariant") ; 6081 if (v == 0) { 6082 // Do this the hard way by blocking ... 6083 // See http://monaco.sfbay/detail.jsf?cr=5094058. 6084 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking. 6085 // Only for SPARC >= V8PlusA 6086 #if defined(__sparc) && defined(COMPILER2) 6087 if (ClearFPUAtPark) { _mark_fpu_nosave() ; } 6088 #endif 6089 int status = os::Solaris::mutex_lock(_mutex); 6090 assert_status(status == 0, status, "mutex_lock"); 6091 guarantee (_nParked == 0, "invariant") ; 6092 ++ _nParked ; 6093 while (_Event < 0) { 6094 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... 6095 // Treat this the same as if the wait was interrupted 6096 // With usr/lib/lwp going to kernel, always handle ETIME 6097 status = os::Solaris::cond_wait(_cond, _mutex); 6098 if (status == ETIME) status = EINTR ; 6099 assert_status(status == 0 || status == EINTR, status, "cond_wait"); 6100 } 6101 -- _nParked ; 6102 _Event = 0 ; 6103 status = os::Solaris::mutex_unlock(_mutex); 6104 assert_status(status == 0, status, "mutex_unlock"); 6105 // Paranoia to ensure our locked and lock-free paths interact 6106 // correctly with each other. 6107 OrderAccess::fence(); 6108 } 6109 } 6110 6111 int os::PlatformEvent::park(jlong millis) { 6112 guarantee (_nParked == 0, "invariant") ; 6113 int v ; 6114 for (;;) { 6115 v = _Event ; 6116 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 6117 } 6118 guarantee (v >= 0, "invariant") ; 6119 if (v != 0) return OS_OK ; 6120 6121 int ret = OS_TIMEOUT; 6122 timestruc_t abst; 6123 compute_abstime (&abst, millis); 6124 6125 // See http://monaco.sfbay/detail.jsf?cr=5094058. 6126 // For Solaris SPARC set fprs.FEF=0 prior to parking. 6127 // Only for SPARC >= V8PlusA 6128 #if defined(__sparc) && defined(COMPILER2) 6129 if (ClearFPUAtPark) { _mark_fpu_nosave() ; } 6130 #endif 6131 int status = os::Solaris::mutex_lock(_mutex); 6132 assert_status(status == 0, status, "mutex_lock"); 6133 guarantee (_nParked == 0, "invariant") ; 6134 ++ _nParked ; 6135 while (_Event < 0) { 6136 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst); 6137 assert_status(status == 0 || status == EINTR || 6138 status == ETIME || status == ETIMEDOUT, 6139 status, "cond_timedwait"); 6140 if (!FilterSpuriousWakeups) break ; // previous semantics 6141 if (status == ETIME || status == ETIMEDOUT) break ; 6142 // We consume and ignore EINTR and spurious wakeups. 6143 } 6144 -- _nParked ; 6145 if (_Event >= 0) ret = OS_OK ; 6146 _Event = 0 ; 6147 status = os::Solaris::mutex_unlock(_mutex); 6148 assert_status(status == 0, status, "mutex_unlock"); 6149 // Paranoia to ensure our locked and lock-free paths interact 6150 // correctly with each other. 6151 OrderAccess::fence(); 6152 return ret; 6153 } 6154 6155 void os::PlatformEvent::unpark() { 6156 // Transitions for _Event: 6157 // 0 :=> 1 6158 // 1 :=> 1 6159 // -1 :=> either 0 or 1; must signal target thread 6160 // That is, we can safely transition _Event from -1 to either 6161 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back 6162 // unpark() calls. 6163 // See also: "Semaphores in Plan 9" by Mullender & Cox 6164 // 6165 // Note: Forcing a transition from "-1" to "1" on an unpark() means 6166 // that it will take two back-to-back park() calls for the owning 6167 // thread to block. This has the benefit of forcing a spurious return 6168 // from the first park() call after an unpark() call which will help 6169 // shake out uses of park() and unpark() without condition variables. 6170 6171 if (Atomic::xchg(1, &_Event) >= 0) return; 6172 6173 // If the thread associated with the event was parked, wake it. 6174 // Wait for the thread assoc with the PlatformEvent to vacate. 6175 int status = os::Solaris::mutex_lock(_mutex); 6176 assert_status(status == 0, status, "mutex_lock"); 6177 int AnyWaiters = _nParked; 6178 status = os::Solaris::mutex_unlock(_mutex); 6179 assert_status(status == 0, status, "mutex_unlock"); 6180 guarantee(AnyWaiters == 0 || AnyWaiters == 1, "invariant"); 6181 if (AnyWaiters != 0) { 6182 // We intentional signal *after* dropping the lock 6183 // to avoid a common class of futile wakeups. 6184 status = os::Solaris::cond_signal(_cond); 6185 assert_status(status == 0, status, "cond_signal"); 6186 } 6187 } 6188 6189 // JSR166 6190 // ------------------------------------------------------- 6191 6192 /* 6193 * The solaris and linux implementations of park/unpark are fairly 6194 * conservative for now, but can be improved. They currently use a 6195 * mutex/condvar pair, plus _counter. 6196 * Park decrements _counter if > 0, else does a condvar wait. Unpark 6197 * sets count to 1 and signals condvar. Only one thread ever waits 6198 * on the condvar. Contention seen when trying to park implies that someone 6199 * is unparking you, so don't wait. And spurious returns are fine, so there 6200 * is no need to track notifications. 6201 */ 6202 6203 #define MAX_SECS 100000000 6204 /* 6205 * This code is common to linux and solaris and will be moved to a 6206 * common place in dolphin. 6207 * 6208 * The passed in time value is either a relative time in nanoseconds 6209 * or an absolute time in milliseconds. Either way it has to be unpacked 6210 * into suitable seconds and nanoseconds components and stored in the 6211 * given timespec structure. 6212 * Given time is a 64-bit value and the time_t used in the timespec is only 6213 * a signed-32-bit value (except on 64-bit Linux) we have to watch for 6214 * overflow if times way in the future are given. Further on Solaris versions 6215 * prior to 10 there is a restriction (see cond_timedwait) that the specified 6216 * number of seconds, in abstime, is less than current_time + 100,000,000. 6217 * As it will be 28 years before "now + 100000000" will overflow we can 6218 * ignore overflow and just impose a hard-limit on seconds using the value 6219 * of "now + 100,000,000". This places a limit on the timeout of about 3.17 6220 * years from "now". 6221 */ 6222 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) { 6223 assert (time > 0, "convertTime"); 6224 6225 struct timeval now; 6226 int status = gettimeofday(&now, NULL); 6227 assert(status == 0, "gettimeofday"); 6228 6229 time_t max_secs = now.tv_sec + MAX_SECS; 6230 6231 if (isAbsolute) { 6232 jlong secs = time / 1000; 6233 if (secs > max_secs) { 6234 absTime->tv_sec = max_secs; 6235 } 6236 else { 6237 absTime->tv_sec = secs; 6238 } 6239 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; 6240 } 6241 else { 6242 jlong secs = time / NANOSECS_PER_SEC; 6243 if (secs >= MAX_SECS) { 6244 absTime->tv_sec = max_secs; 6245 absTime->tv_nsec = 0; 6246 } 6247 else { 6248 absTime->tv_sec = now.tv_sec + secs; 6249 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; 6250 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { 6251 absTime->tv_nsec -= NANOSECS_PER_SEC; 6252 ++absTime->tv_sec; // note: this must be <= max_secs 6253 } 6254 } 6255 } 6256 assert(absTime->tv_sec >= 0, "tv_sec < 0"); 6257 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); 6258 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); 6259 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); 6260 } 6261 6262 void Parker::park(bool isAbsolute, jlong time) { 6263 // Ideally we'd do something useful while spinning, such 6264 // as calling unpackTime(). 6265 6266 // Optional fast-path check: 6267 // Return immediately if a permit is available. 6268 // We depend on Atomic::xchg() having full barrier semantics 6269 // since we are doing a lock-free update to _counter. 6270 if (Atomic::xchg(0, &_counter) > 0) return; 6271 6272 // Optional fast-exit: Check interrupt before trying to wait 6273 Thread* thread = Thread::current(); 6274 assert(thread->is_Java_thread(), "Must be JavaThread"); 6275 JavaThread *jt = (JavaThread *)thread; 6276 if (Thread::is_interrupted(thread, false)) { 6277 return; 6278 } 6279 6280 // First, demultiplex/decode time arguments 6281 timespec absTime; 6282 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all 6283 return; 6284 } 6285 if (time > 0) { 6286 // Warning: this code might be exposed to the old Solaris time 6287 // round-down bugs. Grep "roundingFix" for details. 6288 unpackTime(&absTime, isAbsolute, time); 6289 } 6290 6291 // Enter safepoint region 6292 // Beware of deadlocks such as 6317397. 6293 // The per-thread Parker:: _mutex is a classic leaf-lock. 6294 // In particular a thread must never block on the Threads_lock while 6295 // holding the Parker:: mutex. If safepoints are pending both the 6296 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. 6297 ThreadBlockInVM tbivm(jt); 6298 6299 // Don't wait if cannot get lock since interference arises from 6300 // unblocking. Also. check interrupt before trying wait 6301 if (Thread::is_interrupted(thread, false) || 6302 os::Solaris::mutex_trylock(_mutex) != 0) { 6303 return; 6304 } 6305 6306 int status ; 6307 6308 if (_counter > 0) { // no wait needed 6309 _counter = 0; 6310 status = os::Solaris::mutex_unlock(_mutex); 6311 assert (status == 0, "invariant") ; 6312 // Paranoia to ensure our locked and lock-free paths interact 6313 // correctly with each other and Java-level accesses. 6314 OrderAccess::fence(); 6315 return; 6316 } 6317 6318 #ifdef ASSERT 6319 // Don't catch signals while blocked; let the running threads have the signals. 6320 // (This allows a debugger to break into the running thread.) 6321 sigset_t oldsigs; 6322 sigset_t* allowdebug_blocked = os::Solaris::allowdebug_blocked_signals(); 6323 thr_sigsetmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); 6324 #endif 6325 6326 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 6327 jt->set_suspend_equivalent(); 6328 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 6329 6330 // Do this the hard way by blocking ... 6331 // See http://monaco.sfbay/detail.jsf?cr=5094058. 6332 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking. 6333 // Only for SPARC >= V8PlusA 6334 #if defined(__sparc) && defined(COMPILER2) 6335 if (ClearFPUAtPark) { _mark_fpu_nosave() ; } 6336 #endif 6337 6338 if (time == 0) { 6339 status = os::Solaris::cond_wait (_cond, _mutex) ; 6340 } else { 6341 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime); 6342 } 6343 // Note that an untimed cond_wait() can sometimes return ETIME on older 6344 // versions of the Solaris. 6345 assert_status(status == 0 || status == EINTR || 6346 status == ETIME || status == ETIMEDOUT, 6347 status, "cond_timedwait"); 6348 6349 #ifdef ASSERT 6350 thr_sigsetmask(SIG_SETMASK, &oldsigs, NULL); 6351 #endif 6352 _counter = 0 ; 6353 status = os::Solaris::mutex_unlock(_mutex); 6354 assert_status(status == 0, status, "mutex_unlock") ; 6355 // Paranoia to ensure our locked and lock-free paths interact 6356 // correctly with each other and Java-level accesses. 6357 OrderAccess::fence(); 6358 6359 // If externally suspended while waiting, re-suspend 6360 if (jt->handle_special_suspend_equivalent_condition()) { 6361 jt->java_suspend_self(); 6362 } 6363 } 6364 6365 void Parker::unpark() { 6366 int s, status ; 6367 status = os::Solaris::mutex_lock (_mutex) ; 6368 assert (status == 0, "invariant") ; 6369 s = _counter; 6370 _counter = 1; 6371 status = os::Solaris::mutex_unlock (_mutex) ; 6372 assert (status == 0, "invariant") ; 6373 6374 if (s < 1) { 6375 status = os::Solaris::cond_signal (_cond) ; 6376 assert (status == 0, "invariant") ; 6377 } 6378 } 6379 6380 extern char** environ; 6381 6382 // Run the specified command in a separate process. Return its exit value, 6383 // or -1 on failure (e.g. can't fork a new process). 6384 // Unlike system(), this function can be called from signal handler. It 6385 // doesn't block SIGINT et al. 6386 int os::fork_and_exec(char* cmd) { 6387 char * argv[4]; 6388 argv[0] = (char *)"sh"; 6389 argv[1] = (char *)"-c"; 6390 argv[2] = cmd; 6391 argv[3] = NULL; 6392 6393 // fork is async-safe, fork1 is not so can't use in signal handler 6394 pid_t pid; 6395 Thread* t = ThreadLocalStorage::get_thread_slow(); 6396 if (t != NULL && t->is_inside_signal_handler()) { 6397 pid = fork(); 6398 } else { 6399 pid = fork1(); 6400 } 6401 6402 if (pid < 0) { 6403 // fork failed 6404 warning("fork failed: %s", strerror(errno)); 6405 return -1; 6406 6407 } else if (pid == 0) { 6408 // child process 6409 6410 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris 6411 execve("/usr/bin/sh", argv, environ); 6412 6413 // execve failed 6414 _exit(-1); 6415 6416 } else { 6417 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 6418 // care about the actual exit code, for now. 6419 6420 int status; 6421 6422 // Wait for the child process to exit. This returns immediately if 6423 // the child has already exited. */ 6424 while (waitpid(pid, &status, 0) < 0) { 6425 switch (errno) { 6426 case ECHILD: return 0; 6427 case EINTR: break; 6428 default: return -1; 6429 } 6430 } 6431 6432 if (WIFEXITED(status)) { 6433 // The child exited normally; get its exit code. 6434 return WEXITSTATUS(status); 6435 } else if (WIFSIGNALED(status)) { 6436 // The child exited because of a signal 6437 // The best value to return is 0x80 + signal number, 6438 // because that is what all Unix shells do, and because 6439 // it allows callers to distinguish between process exit and 6440 // process death by signal. 6441 return 0x80 + WTERMSIG(status); 6442 } else { 6443 // Unknown exit code; pass it through 6444 return status; 6445 } 6446 } 6447 } 6448 6449 // is_headless_jre() 6450 // 6451 // Test for the existence of xawt/libmawt.so or libawt_xawt.so 6452 // in order to report if we are running in a headless jre 6453 // 6454 // Since JDK8 xawt/libmawt.so was moved into the same directory 6455 // as libawt.so, and renamed libawt_xawt.so 6456 // 6457 bool os::is_headless_jre() { 6458 struct stat statbuf; 6459 char buf[MAXPATHLEN]; 6460 char libmawtpath[MAXPATHLEN]; 6461 const char *xawtstr = "/xawt/libmawt.so"; 6462 const char *new_xawtstr = "/libawt_xawt.so"; 6463 char *p; 6464 6465 // Get path to libjvm.so 6466 os::jvm_path(buf, sizeof(buf)); 6467 6468 // Get rid of libjvm.so 6469 p = strrchr(buf, '/'); 6470 if (p == NULL) return false; 6471 else *p = '\0'; 6472 6473 // Get rid of client or server 6474 p = strrchr(buf, '/'); 6475 if (p == NULL) return false; 6476 else *p = '\0'; 6477 6478 // check xawt/libmawt.so 6479 strcpy(libmawtpath, buf); 6480 strcat(libmawtpath, xawtstr); 6481 if (::stat(libmawtpath, &statbuf) == 0) return false; 6482 6483 // check libawt_xawt.so 6484 strcpy(libmawtpath, buf); 6485 strcat(libmawtpath, new_xawtstr); 6486 if (::stat(libmawtpath, &statbuf) == 0) return false; 6487 6488 return true; 6489 } 6490 6491 size_t os::write(int fd, const void *buf, unsigned int nBytes) { 6492 INTERRUPTIBLE_RETURN_INT(::write(fd, buf, nBytes), os::Solaris::clear_interrupted); 6493 } 6494 6495 int os::close(int fd) { 6496 return ::close(fd); 6497 } 6498 6499 int os::socket_close(int fd) { 6500 return ::close(fd); 6501 } 6502 6503 int os::recv(int fd, char* buf, size_t nBytes, uint flags) { 6504 INTERRUPTIBLE_RETURN_INT((int)::recv(fd, buf, nBytes, flags), os::Solaris::clear_interrupted); 6505 } 6506 6507 int os::send(int fd, char* buf, size_t nBytes, uint flags) { 6508 INTERRUPTIBLE_RETURN_INT((int)::send(fd, buf, nBytes, flags), os::Solaris::clear_interrupted); 6509 } 6510 6511 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) { 6512 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags)); 6513 } 6514 6515 // As both poll and select can be interrupted by signals, we have to be 6516 // prepared to restart the system call after updating the timeout, unless 6517 // a poll() is done with timeout == -1, in which case we repeat with this 6518 // "wait forever" value. 6519 6520 int os::timeout(int fd, long timeout) { 6521 int res; 6522 struct timeval t; 6523 julong prevtime, newtime; 6524 static const char* aNull = 0; 6525 struct pollfd pfd; 6526 pfd.fd = fd; 6527 pfd.events = POLLIN; 6528 6529 gettimeofday(&t, &aNull); 6530 prevtime = ((julong)t.tv_sec * 1000) + t.tv_usec / 1000; 6531 6532 for(;;) { 6533 INTERRUPTIBLE_NORESTART(::poll(&pfd, 1, timeout), res, os::Solaris::clear_interrupted); 6534 if(res == OS_ERR && errno == EINTR) { 6535 if(timeout != -1) { 6536 gettimeofday(&t, &aNull); 6537 newtime = ((julong)t.tv_sec * 1000) + t.tv_usec /1000; 6538 timeout -= newtime - prevtime; 6539 if(timeout <= 0) 6540 return OS_OK; 6541 prevtime = newtime; 6542 } 6543 } else return res; 6544 } 6545 } 6546 6547 int os::connect(int fd, struct sockaddr *him, socklen_t len) { 6548 int _result; 6549 INTERRUPTIBLE_NORESTART(::connect(fd, him, len), _result,\ 6550 os::Solaris::clear_interrupted); 6551 6552 // Depending on when thread interruption is reset, _result could be 6553 // one of two values when errno == EINTR 6554 6555 if (((_result == OS_INTRPT) || (_result == OS_ERR)) 6556 && (errno == EINTR)) { 6557 /* restarting a connect() changes its errno semantics */ 6558 INTERRUPTIBLE(::connect(fd, him, len), _result,\ 6559 os::Solaris::clear_interrupted); 6560 /* undo these changes */ 6561 if (_result == OS_ERR) { 6562 if (errno == EALREADY) { 6563 errno = EINPROGRESS; /* fall through */ 6564 } else if (errno == EISCONN) { 6565 errno = 0; 6566 return OS_OK; 6567 } 6568 } 6569 } 6570 return _result; 6571 } 6572 6573 int os::accept(int fd, struct sockaddr* him, socklen_t* len) { 6574 if (fd < 0) { 6575 return OS_ERR; 6576 } 6577 INTERRUPTIBLE_RETURN_INT((int)::accept(fd, him, len),\ 6578 os::Solaris::clear_interrupted); 6579 } 6580 6581 int os::recvfrom(int fd, char* buf, size_t nBytes, uint flags, 6582 sockaddr* from, socklen_t* fromlen) { 6583 INTERRUPTIBLE_RETURN_INT((int)::recvfrom(fd, buf, nBytes, flags, from, fromlen),\ 6584 os::Solaris::clear_interrupted); 6585 } 6586 6587 int os::sendto(int fd, char* buf, size_t len, uint flags, 6588 struct sockaddr* to, socklen_t tolen) { 6589 INTERRUPTIBLE_RETURN_INT((int)::sendto(fd, buf, len, flags, to, tolen),\ 6590 os::Solaris::clear_interrupted); 6591 } 6592 6593 int os::socket_available(int fd, jint *pbytes) { 6594 if (fd < 0) { 6595 return OS_OK; 6596 } 6597 int ret; 6598 RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret); 6599 // note: ioctl can return 0 when successful, JVM_SocketAvailable 6600 // is expected to return 0 on failure and 1 on success to the jdk. 6601 return (ret == OS_ERR) ? 0 : 1; 6602 } 6603 6604 int os::bind(int fd, struct sockaddr* him, socklen_t len) { 6605 INTERRUPTIBLE_RETURN_INT_NORESTART(::bind(fd, him, len),\ 6606 os::Solaris::clear_interrupted); 6607 } 6608 6609 // Get the default path to the core file 6610 // Returns the length of the string 6611 int os::get_core_path(char* buffer, size_t bufferSize) { 6612 const char* p = get_current_directory(buffer, bufferSize); 6613 6614 if (p == NULL) { 6615 assert(p != NULL, "failed to get current directory"); 6616 return 0; 6617 } 6618 6619 return strlen(buffer); 6620 } 6621 6622 #ifndef PRODUCT 6623 void TestReserveMemorySpecial_test() { 6624 // No tests available for this platform 6625 } 6626 #endif