1 /* 2 * Copyright (c) 1997, 2013, 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 int os::stat(const char *path, struct stat *sbuf) { 2150 char pathbuf[MAX_PATH]; 2151 if (strlen(path) > MAX_PATH - 1) { 2152 errno = ENAMETOOLONG; 2153 return -1; 2154 } 2155 os::native_path(strcpy(pathbuf, path)); 2156 return ::stat(pathbuf, sbuf); 2157 } 2158 2159 static bool _print_ascii_file(const char* filename, outputStream* st) { 2160 int fd = ::open(filename, O_RDONLY); 2161 if (fd == -1) { 2162 return false; 2163 } 2164 2165 char buf[32]; 2166 int bytes; 2167 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { 2168 st->print_raw(buf, bytes); 2169 } 2170 2171 ::close(fd); 2172 2173 return true; 2174 } 2175 2176 void os::print_os_info_brief(outputStream* st) { 2177 os::Solaris::print_distro_info(st); 2178 2179 os::Posix::print_uname_info(st); 2180 2181 os::Solaris::print_libversion_info(st); 2182 } 2183 2184 void os::print_os_info(outputStream* st) { 2185 st->print("OS:"); 2186 2187 os::Solaris::print_distro_info(st); 2188 2189 os::Posix::print_uname_info(st); 2190 2191 os::Solaris::print_libversion_info(st); 2192 2193 os::Posix::print_rlimit_info(st); 2194 2195 os::Posix::print_load_average(st); 2196 } 2197 2198 void os::Solaris::print_distro_info(outputStream* st) { 2199 if (!_print_ascii_file("/etc/release", st)) { 2200 st->print("Solaris"); 2201 } 2202 st->cr(); 2203 } 2204 2205 void os::Solaris::print_libversion_info(outputStream* st) { 2206 if (os::Solaris::T2_libthread()) { 2207 st->print(" (T2 libthread)"); 2208 } 2209 else { 2210 st->print(" (T1 libthread)"); 2211 } 2212 st->cr(); 2213 } 2214 2215 static bool check_addr0(outputStream* st) { 2216 jboolean status = false; 2217 int fd = ::open("/proc/self/map",O_RDONLY); 2218 if (fd >= 0) { 2219 prmap_t p; 2220 while(::read(fd, &p, sizeof(p)) > 0) { 2221 if (p.pr_vaddr == 0x0) { 2222 st->print("Warning: Address: 0x%x, Size: %dK, ",p.pr_vaddr, p.pr_size/1024, p.pr_mapname); 2223 st->print("Mapped file: %s, ", p.pr_mapname[0] == '\0' ? "None" : p.pr_mapname); 2224 st->print("Access:"); 2225 st->print("%s",(p.pr_mflags & MA_READ) ? "r" : "-"); 2226 st->print("%s",(p.pr_mflags & MA_WRITE) ? "w" : "-"); 2227 st->print("%s",(p.pr_mflags & MA_EXEC) ? "x" : "-"); 2228 st->cr(); 2229 status = true; 2230 } 2231 ::close(fd); 2232 } 2233 } 2234 return status; 2235 } 2236 2237 void os::pd_print_cpu_info(outputStream* st) { 2238 // Nothing to do for now. 2239 } 2240 2241 void os::print_memory_info(outputStream* st) { 2242 st->print("Memory:"); 2243 st->print(" %dk page", os::vm_page_size()>>10); 2244 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10); 2245 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10); 2246 st->cr(); 2247 (void) check_addr0(st); 2248 } 2249 2250 // Taken from /usr/include/sys/machsig.h Supposed to be architecture specific 2251 // but they're the same for all the solaris architectures that we support. 2252 const char *ill_names[] = { "ILL0", "ILL_ILLOPC", "ILL_ILLOPN", "ILL_ILLADR", 2253 "ILL_ILLTRP", "ILL_PRVOPC", "ILL_PRVREG", 2254 "ILL_COPROC", "ILL_BADSTK" }; 2255 2256 const char *fpe_names[] = { "FPE0", "FPE_INTDIV", "FPE_INTOVF", "FPE_FLTDIV", 2257 "FPE_FLTOVF", "FPE_FLTUND", "FPE_FLTRES", 2258 "FPE_FLTINV", "FPE_FLTSUB" }; 2259 2260 const char *segv_names[] = { "SEGV0", "SEGV_MAPERR", "SEGV_ACCERR" }; 2261 2262 const char *bus_names[] = { "BUS0", "BUS_ADRALN", "BUS_ADRERR", "BUS_OBJERR" }; 2263 2264 void os::print_siginfo(outputStream* st, void* siginfo) { 2265 st->print("siginfo:"); 2266 2267 const int buflen = 100; 2268 char buf[buflen]; 2269 siginfo_t *si = (siginfo_t*)siginfo; 2270 st->print("si_signo=%s: ", os::exception_name(si->si_signo, buf, buflen)); 2271 char *err = strerror(si->si_errno); 2272 if (si->si_errno != 0 && err != NULL) { 2273 st->print("si_errno=%s", err); 2274 } else { 2275 st->print("si_errno=%d", si->si_errno); 2276 } 2277 const int c = si->si_code; 2278 assert(c > 0, "unexpected si_code"); 2279 switch (si->si_signo) { 2280 case SIGILL: 2281 st->print(", si_code=%d (%s)", c, c > 8 ? "" : ill_names[c]); 2282 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 2283 break; 2284 case SIGFPE: 2285 st->print(", si_code=%d (%s)", c, c > 9 ? "" : fpe_names[c]); 2286 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 2287 break; 2288 case SIGSEGV: 2289 st->print(", si_code=%d (%s)", c, c > 2 ? "" : segv_names[c]); 2290 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 2291 break; 2292 case SIGBUS: 2293 st->print(", si_code=%d (%s)", c, c > 3 ? "" : bus_names[c]); 2294 st->print(", si_addr=" PTR_FORMAT, si->si_addr); 2295 break; 2296 default: 2297 st->print(", si_code=%d", si->si_code); 2298 // no si_addr 2299 } 2300 2301 if ((si->si_signo == SIGBUS || si->si_signo == SIGSEGV) && 2302 UseSharedSpaces) { 2303 FileMapInfo* mapinfo = FileMapInfo::current_info(); 2304 if (mapinfo->is_in_shared_space(si->si_addr)) { 2305 st->print("\n\nError accessing class data sharing archive." \ 2306 " Mapped file inaccessible during execution, " \ 2307 " possible disk/network problem."); 2308 } 2309 } 2310 st->cr(); 2311 } 2312 2313 // Moved from whole group, because we need them here for diagnostic 2314 // prints. 2315 #define OLDMAXSIGNUM 32 2316 static int Maxsignum = 0; 2317 static int *ourSigFlags = NULL; 2318 2319 extern "C" void sigINTRHandler(int, siginfo_t*, void*); 2320 2321 int os::Solaris::get_our_sigflags(int sig) { 2322 assert(ourSigFlags!=NULL, "signal data structure not initialized"); 2323 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range"); 2324 return ourSigFlags[sig]; 2325 } 2326 2327 void os::Solaris::set_our_sigflags(int sig, int flags) { 2328 assert(ourSigFlags!=NULL, "signal data structure not initialized"); 2329 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range"); 2330 ourSigFlags[sig] = flags; 2331 } 2332 2333 2334 static const char* get_signal_handler_name(address handler, 2335 char* buf, int buflen) { 2336 int offset; 2337 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 2338 if (found) { 2339 // skip directory names 2340 const char *p1, *p2; 2341 p1 = buf; 2342 size_t len = strlen(os::file_separator()); 2343 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 2344 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); 2345 } else { 2346 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 2347 } 2348 return buf; 2349 } 2350 2351 static void print_signal_handler(outputStream* st, int sig, 2352 char* buf, size_t buflen) { 2353 struct sigaction sa; 2354 2355 sigaction(sig, NULL, &sa); 2356 2357 st->print("%s: ", os::exception_name(sig, buf, buflen)); 2358 2359 address handler = (sa.sa_flags & SA_SIGINFO) 2360 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 2361 : CAST_FROM_FN_PTR(address, sa.sa_handler); 2362 2363 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 2364 st->print("SIG_DFL"); 2365 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 2366 st->print("SIG_IGN"); 2367 } else { 2368 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 2369 } 2370 2371 st->print(", sa_mask[0]=" PTR32_FORMAT, *(uint32_t*)&sa.sa_mask); 2372 2373 address rh = VMError::get_resetted_sighandler(sig); 2374 // May be, handler was resetted by VMError? 2375 if(rh != NULL) { 2376 handler = rh; 2377 sa.sa_flags = VMError::get_resetted_sigflags(sig); 2378 } 2379 2380 st->print(", sa_flags=" PTR32_FORMAT, sa.sa_flags); 2381 2382 // Check: is it our handler? 2383 if(handler == CAST_FROM_FN_PTR(address, signalHandler) || 2384 handler == CAST_FROM_FN_PTR(address, sigINTRHandler)) { 2385 // It is our signal handler 2386 // check for flags 2387 if(sa.sa_flags != os::Solaris::get_our_sigflags(sig)) { 2388 st->print( 2389 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", 2390 os::Solaris::get_our_sigflags(sig)); 2391 } 2392 } 2393 st->cr(); 2394 } 2395 2396 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 2397 st->print_cr("Signal Handlers:"); 2398 print_signal_handler(st, SIGSEGV, buf, buflen); 2399 print_signal_handler(st, SIGBUS , buf, buflen); 2400 print_signal_handler(st, SIGFPE , buf, buflen); 2401 print_signal_handler(st, SIGPIPE, buf, buflen); 2402 print_signal_handler(st, SIGXFSZ, buf, buflen); 2403 print_signal_handler(st, SIGILL , buf, buflen); 2404 print_signal_handler(st, INTERRUPT_SIGNAL, buf, buflen); 2405 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen); 2406 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); 2407 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen); 2408 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); 2409 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen); 2410 print_signal_handler(st, os::Solaris::SIGinterrupt(), buf, buflen); 2411 print_signal_handler(st, os::Solaris::SIGasync(), buf, buflen); 2412 } 2413 2414 static char saved_jvm_path[MAXPATHLEN] = { 0 }; 2415 2416 // Find the full path to the current module, libjvm.so 2417 void os::jvm_path(char *buf, jint buflen) { 2418 // Error checking. 2419 if (buflen < MAXPATHLEN) { 2420 assert(false, "must use a large-enough buffer"); 2421 buf[0] = '\0'; 2422 return; 2423 } 2424 // Lazy resolve the path to current module. 2425 if (saved_jvm_path[0] != 0) { 2426 strcpy(buf, saved_jvm_path); 2427 return; 2428 } 2429 2430 Dl_info dlinfo; 2431 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo); 2432 assert(ret != 0, "cannot locate libjvm"); 2433 if (ret != 0 && dlinfo.dli_fname != NULL) { 2434 realpath((char *)dlinfo.dli_fname, buf); 2435 } else { 2436 buf[0] = '\0'; 2437 return; 2438 } 2439 2440 if (Arguments::created_by_gamma_launcher()) { 2441 // Support for the gamma launcher. Typical value for buf is 2442 // "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so". If "/jre/lib/" appears at 2443 // the right place in the string, then assume we are installed in a JDK and 2444 // we're done. Otherwise, check for a JAVA_HOME environment variable and fix 2445 // up the path so it looks like libjvm.so is installed there (append a 2446 // fake suffix hotspot/libjvm.so). 2447 const char *p = buf + strlen(buf) - 1; 2448 for (int count = 0; p > buf && count < 5; ++count) { 2449 for (--p; p > buf && *p != '/'; --p) 2450 /* empty */ ; 2451 } 2452 2453 if (strncmp(p, "/jre/lib/", 9) != 0) { 2454 // Look for JAVA_HOME in the environment. 2455 char* java_home_var = ::getenv("JAVA_HOME"); 2456 if (java_home_var != NULL && java_home_var[0] != 0) { 2457 char cpu_arch[12]; 2458 char* jrelib_p; 2459 int len; 2460 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch)); 2461 #ifdef _LP64 2462 // If we are on sparc running a 64-bit vm, look in jre/lib/sparcv9. 2463 if (strcmp(cpu_arch, "sparc") == 0) { 2464 strcat(cpu_arch, "v9"); 2465 } else if (strcmp(cpu_arch, "i386") == 0) { 2466 strcpy(cpu_arch, "amd64"); 2467 } 2468 #endif 2469 // Check the current module name "libjvm.so". 2470 p = strrchr(buf, '/'); 2471 assert(strstr(p, "/libjvm") == p, "invalid library name"); 2472 2473 realpath(java_home_var, buf); 2474 // determine if this is a legacy image or modules image 2475 // modules image doesn't have "jre" subdirectory 2476 len = strlen(buf); 2477 jrelib_p = buf + len; 2478 snprintf(jrelib_p, buflen-len, "/jre/lib/%s", cpu_arch); 2479 if (0 != access(buf, F_OK)) { 2480 snprintf(jrelib_p, buflen-len, "/lib/%s", cpu_arch); 2481 } 2482 2483 if (0 == access(buf, F_OK)) { 2484 // Use current module name "libjvm.so" 2485 len = strlen(buf); 2486 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so"); 2487 } else { 2488 // Go back to path of .so 2489 realpath((char *)dlinfo.dli_fname, buf); 2490 } 2491 } 2492 } 2493 } 2494 2495 strcpy(saved_jvm_path, buf); 2496 } 2497 2498 2499 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 2500 // no prefix required, not even "_" 2501 } 2502 2503 2504 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 2505 // no suffix required 2506 } 2507 2508 // This method is a copy of JDK's sysGetLastErrorString 2509 // from src/solaris/hpi/src/system_md.c 2510 2511 size_t os::lasterror(char *buf, size_t len) { 2512 2513 if (errno == 0) return 0; 2514 2515 const char *s = ::strerror(errno); 2516 size_t n = ::strlen(s); 2517 if (n >= len) { 2518 n = len - 1; 2519 } 2520 ::strncpy(buf, s, n); 2521 buf[n] = '\0'; 2522 return n; 2523 } 2524 2525 2526 // sun.misc.Signal 2527 2528 extern "C" { 2529 static void UserHandler(int sig, void *siginfo, void *context) { 2530 // Ctrl-C is pressed during error reporting, likely because the error 2531 // handler fails to abort. Let VM die immediately. 2532 if (sig == SIGINT && is_error_reported()) { 2533 os::die(); 2534 } 2535 2536 os::signal_notify(sig); 2537 // We do not need to reinstate the signal handler each time... 2538 } 2539 } 2540 2541 void* os::user_handler() { 2542 return CAST_FROM_FN_PTR(void*, UserHandler); 2543 } 2544 2545 class Semaphore : public StackObj { 2546 public: 2547 Semaphore(); 2548 ~Semaphore(); 2549 void signal(); 2550 void wait(); 2551 bool trywait(); 2552 bool timedwait(unsigned int sec, int nsec); 2553 private: 2554 sema_t _semaphore; 2555 }; 2556 2557 2558 Semaphore::Semaphore() { 2559 sema_init(&_semaphore, 0, NULL, NULL); 2560 } 2561 2562 Semaphore::~Semaphore() { 2563 sema_destroy(&_semaphore); 2564 } 2565 2566 void Semaphore::signal() { 2567 sema_post(&_semaphore); 2568 } 2569 2570 void Semaphore::wait() { 2571 sema_wait(&_semaphore); 2572 } 2573 2574 bool Semaphore::trywait() { 2575 return sema_trywait(&_semaphore) == 0; 2576 } 2577 2578 bool Semaphore::timedwait(unsigned int sec, int nsec) { 2579 struct timespec ts; 2580 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec); 2581 2582 while (1) { 2583 int result = sema_timedwait(&_semaphore, &ts); 2584 if (result == 0) { 2585 return true; 2586 } else if (errno == EINTR) { 2587 continue; 2588 } else if (errno == ETIME) { 2589 return false; 2590 } else { 2591 return false; 2592 } 2593 } 2594 } 2595 2596 extern "C" { 2597 typedef void (*sa_handler_t)(int); 2598 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); 2599 } 2600 2601 void* os::signal(int signal_number, void* handler) { 2602 struct sigaction sigAct, oldSigAct; 2603 sigfillset(&(sigAct.sa_mask)); 2604 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND; 2605 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); 2606 2607 if (sigaction(signal_number, &sigAct, &oldSigAct)) 2608 // -1 means registration failed 2609 return (void *)-1; 2610 2611 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); 2612 } 2613 2614 void os::signal_raise(int signal_number) { 2615 raise(signal_number); 2616 } 2617 2618 /* 2619 * The following code is moved from os.cpp for making this 2620 * code platform specific, which it is by its very nature. 2621 */ 2622 2623 // a counter for each possible signal value 2624 static int Sigexit = 0; 2625 static int Maxlibjsigsigs; 2626 static jint *pending_signals = NULL; 2627 static int *preinstalled_sigs = NULL; 2628 static struct sigaction *chainedsigactions = NULL; 2629 static sema_t sig_sem; 2630 typedef int (*version_getting_t)(); 2631 version_getting_t os::Solaris::get_libjsig_version = NULL; 2632 static int libjsigversion = NULL; 2633 2634 int os::sigexitnum_pd() { 2635 assert(Sigexit > 0, "signal memory not yet initialized"); 2636 return Sigexit; 2637 } 2638 2639 void os::Solaris::init_signal_mem() { 2640 // Initialize signal structures 2641 Maxsignum = SIGRTMAX; 2642 Sigexit = Maxsignum+1; 2643 assert(Maxsignum >0, "Unable to obtain max signal number"); 2644 2645 Maxlibjsigsigs = Maxsignum; 2646 2647 // pending_signals has one int per signal 2648 // The additional signal is for SIGEXIT - exit signal to signal_thread 2649 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal); 2650 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1))); 2651 2652 if (UseSignalChaining) { 2653 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction) 2654 * (Maxsignum + 1), mtInternal); 2655 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1))); 2656 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1), mtInternal); 2657 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1))); 2658 } 2659 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1 ), mtInternal); 2660 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1)); 2661 } 2662 2663 void os::signal_init_pd() { 2664 int ret; 2665 2666 ret = ::sema_init(&sig_sem, 0, NULL, NULL); 2667 assert(ret == 0, "sema_init() failed"); 2668 } 2669 2670 void os::signal_notify(int signal_number) { 2671 int ret; 2672 2673 Atomic::inc(&pending_signals[signal_number]); 2674 ret = ::sema_post(&sig_sem); 2675 assert(ret == 0, "sema_post() failed"); 2676 } 2677 2678 static int check_pending_signals(bool wait_for_signal) { 2679 int ret; 2680 while (true) { 2681 for (int i = 0; i < Sigexit + 1; i++) { 2682 jint n = pending_signals[i]; 2683 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 2684 return i; 2685 } 2686 } 2687 if (!wait_for_signal) { 2688 return -1; 2689 } 2690 JavaThread *thread = JavaThread::current(); 2691 ThreadBlockInVM tbivm(thread); 2692 2693 bool threadIsSuspended; 2694 do { 2695 thread->set_suspend_equivalent(); 2696 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 2697 while((ret = ::sema_wait(&sig_sem)) == EINTR) 2698 ; 2699 assert(ret == 0, "sema_wait() failed"); 2700 2701 // were we externally suspended while we were waiting? 2702 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2703 if (threadIsSuspended) { 2704 // 2705 // The semaphore has been incremented, but while we were waiting 2706 // another thread suspended us. We don't want to continue running 2707 // while suspended because that would surprise the thread that 2708 // suspended us. 2709 // 2710 ret = ::sema_post(&sig_sem); 2711 assert(ret == 0, "sema_post() failed"); 2712 2713 thread->java_suspend_self(); 2714 } 2715 } while (threadIsSuspended); 2716 } 2717 } 2718 2719 int os::signal_lookup() { 2720 return check_pending_signals(false); 2721 } 2722 2723 int os::signal_wait() { 2724 return check_pending_signals(true); 2725 } 2726 2727 //////////////////////////////////////////////////////////////////////////////// 2728 // Virtual Memory 2729 2730 static int page_size = -1; 2731 2732 // The mmap MAP_ALIGN flag is supported on Solaris 9 and later. init_2() will 2733 // clear this var if support is not available. 2734 static bool has_map_align = true; 2735 2736 int os::vm_page_size() { 2737 assert(page_size != -1, "must call os::init"); 2738 return page_size; 2739 } 2740 2741 // Solaris allocates memory by pages. 2742 int os::vm_allocation_granularity() { 2743 assert(page_size != -1, "must call os::init"); 2744 return page_size; 2745 } 2746 2747 static bool recoverable_mmap_error(int err) { 2748 // See if the error is one we can let the caller handle. This 2749 // list of errno values comes from the Solaris mmap(2) man page. 2750 switch (err) { 2751 case EBADF: 2752 case EINVAL: 2753 case ENOTSUP: 2754 // let the caller deal with these errors 2755 return true; 2756 2757 default: 2758 // Any remaining errors on this OS can cause our reserved mapping 2759 // to be lost. That can cause confusion where different data 2760 // structures think they have the same memory mapped. The worst 2761 // scenario is if both the VM and a library think they have the 2762 // same memory mapped. 2763 return false; 2764 } 2765 } 2766 2767 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec, 2768 int err) { 2769 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 2770 ", %d) failed; error='%s' (errno=%d)", addr, bytes, exec, 2771 strerror(err), err); 2772 } 2773 2774 static void warn_fail_commit_memory(char* addr, size_t bytes, 2775 size_t alignment_hint, bool exec, 2776 int err) { 2777 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 2778 ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, bytes, 2779 alignment_hint, exec, strerror(err), err); 2780 } 2781 2782 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, bool exec) { 2783 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; 2784 size_t size = bytes; 2785 char *res = Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot); 2786 if (res != NULL) { 2787 if (UseNUMAInterleaving) { 2788 numa_make_global(addr, bytes); 2789 } 2790 return 0; 2791 } 2792 2793 int err = errno; // save errno from mmap() call in mmap_chunk() 2794 2795 if (!recoverable_mmap_error(err)) { 2796 warn_fail_commit_memory(addr, bytes, exec, err); 2797 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "committing reserved memory."); 2798 } 2799 2800 return err; 2801 } 2802 2803 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) { 2804 return Solaris::commit_memory_impl(addr, bytes, exec) == 0; 2805 } 2806 2807 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, bool exec, 2808 const char* mesg) { 2809 assert(mesg != NULL, "mesg must be specified"); 2810 int err = os::Solaris::commit_memory_impl(addr, bytes, exec); 2811 if (err != 0) { 2812 // the caller wants all commit errors to exit with the specified mesg: 2813 warn_fail_commit_memory(addr, bytes, exec, err); 2814 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, mesg); 2815 } 2816 } 2817 2818 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, 2819 size_t alignment_hint, bool exec) { 2820 int err = Solaris::commit_memory_impl(addr, bytes, exec); 2821 if (err == 0) { 2822 if (UseLargePages && (alignment_hint > (size_t)vm_page_size())) { 2823 // If the large page size has been set and the VM 2824 // is using large pages, use the large page size 2825 // if it is smaller than the alignment hint. This is 2826 // a case where the VM wants to use a larger alignment size 2827 // for its own reasons but still want to use large pages 2828 // (which is what matters to setting the mpss range. 2829 size_t page_size = 0; 2830 if (large_page_size() < alignment_hint) { 2831 assert(UseLargePages, "Expected to be here for large page use only"); 2832 page_size = large_page_size(); 2833 } else { 2834 // If the alignment hint is less than the large page 2835 // size, the VM wants a particular alignment (thus the hint) 2836 // for internal reasons. Try to set the mpss range using 2837 // the alignment_hint. 2838 page_size = alignment_hint; 2839 } 2840 // Since this is a hint, ignore any failures. 2841 (void)Solaris::setup_large_pages(addr, bytes, page_size); 2842 } 2843 } 2844 return err; 2845 } 2846 2847 bool os::pd_commit_memory(char* addr, size_t bytes, size_t alignment_hint, 2848 bool exec) { 2849 return Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec) == 0; 2850 } 2851 2852 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, 2853 size_t alignment_hint, bool exec, 2854 const char* mesg) { 2855 assert(mesg != NULL, "mesg must be specified"); 2856 int err = os::Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec); 2857 if (err != 0) { 2858 // the caller wants all commit errors to exit with the specified mesg: 2859 warn_fail_commit_memory(addr, bytes, alignment_hint, exec, err); 2860 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, mesg); 2861 } 2862 } 2863 2864 // Uncommit the pages in a specified region. 2865 void os::pd_free_memory(char* addr, size_t bytes, size_t alignment_hint) { 2866 if (madvise(addr, bytes, MADV_FREE) < 0) { 2867 debug_only(warning("MADV_FREE failed.")); 2868 return; 2869 } 2870 } 2871 2872 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 2873 return os::commit_memory(addr, size, !ExecMem); 2874 } 2875 2876 bool os::remove_stack_guard_pages(char* addr, size_t size) { 2877 return os::uncommit_memory(addr, size); 2878 } 2879 2880 // Change the page size in a given range. 2881 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 2882 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned."); 2883 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned."); 2884 if (UseLargePages) { 2885 Solaris::setup_large_pages(addr, bytes, alignment_hint); 2886 } 2887 } 2888 2889 // Tell the OS to make the range local to the first-touching LWP 2890 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { 2891 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned."); 2892 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) { 2893 debug_only(warning("MADV_ACCESS_LWP failed.")); 2894 } 2895 } 2896 2897 // Tell the OS that this range would be accessed from different LWPs. 2898 void os::numa_make_global(char *addr, size_t bytes) { 2899 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned."); 2900 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) { 2901 debug_only(warning("MADV_ACCESS_MANY failed.")); 2902 } 2903 } 2904 2905 // Get the number of the locality groups. 2906 size_t os::numa_get_groups_num() { 2907 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie()); 2908 return n != -1 ? n : 1; 2909 } 2910 2911 // Get a list of leaf locality groups. A leaf lgroup is group that 2912 // doesn't have any children. Typical leaf group is a CPU or a CPU/memory 2913 // board. An LWP is assigned to one of these groups upon creation. 2914 size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2915 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) { 2916 ids[0] = 0; 2917 return 1; 2918 } 2919 int result_size = 0, top = 1, bottom = 0, cur = 0; 2920 for (int k = 0; k < size; k++) { 2921 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur], 2922 (Solaris::lgrp_id_t*)&ids[top], size - top); 2923 if (r == -1) { 2924 ids[0] = 0; 2925 return 1; 2926 } 2927 if (!r) { 2928 // That's a leaf node. 2929 assert (bottom <= cur, "Sanity check"); 2930 // Check if the node has memory 2931 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur], 2932 NULL, 0, LGRP_RSRC_MEM) > 0) { 2933 ids[bottom++] = ids[cur]; 2934 } 2935 } 2936 top += r; 2937 cur++; 2938 } 2939 if (bottom == 0) { 2940 // Handle a situation, when the OS reports no memory available. 2941 // Assume UMA architecture. 2942 ids[0] = 0; 2943 return 1; 2944 } 2945 return bottom; 2946 } 2947 2948 // Detect the topology change. Typically happens during CPU plugging-unplugging. 2949 bool os::numa_topology_changed() { 2950 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie()); 2951 if (is_stale != -1 && is_stale) { 2952 Solaris::lgrp_fini(Solaris::lgrp_cookie()); 2953 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER); 2954 assert(c != 0, "Failure to initialize LGRP API"); 2955 Solaris::set_lgrp_cookie(c); 2956 return true; 2957 } 2958 return false; 2959 } 2960 2961 // Get the group id of the current LWP. 2962 int os::numa_get_group_id() { 2963 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID); 2964 if (lgrp_id == -1) { 2965 return 0; 2966 } 2967 const int size = os::numa_get_groups_num(); 2968 int *ids = (int*)alloca(size * sizeof(int)); 2969 2970 // Get the ids of all lgroups with memory; r is the count. 2971 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id, 2972 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM); 2973 if (r <= 0) { 2974 return 0; 2975 } 2976 return ids[os::random() % r]; 2977 } 2978 2979 // Request information about the page. 2980 bool os::get_page_info(char *start, page_info* info) { 2981 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE }; 2982 uint64_t addr = (uintptr_t)start; 2983 uint64_t outdata[2]; 2984 uint_t validity = 0; 2985 2986 if (os::Solaris::meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) { 2987 return false; 2988 } 2989 2990 info->size = 0; 2991 info->lgrp_id = -1; 2992 2993 if ((validity & 1) != 0) { 2994 if ((validity & 2) != 0) { 2995 info->lgrp_id = outdata[0]; 2996 } 2997 if ((validity & 4) != 0) { 2998 info->size = outdata[1]; 2999 } 3000 return true; 3001 } 3002 return false; 3003 } 3004 3005 // Scan the pages from start to end until a page different than 3006 // the one described in the info parameter is encountered. 3007 char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found) { 3008 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE }; 3009 const size_t types = sizeof(info_types) / sizeof(info_types[0]); 3010 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT]; 3011 uint_t validity[MAX_MEMINFO_CNT]; 3012 3013 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size); 3014 uint64_t p = (uint64_t)start; 3015 while (p < (uint64_t)end) { 3016 addrs[0] = p; 3017 size_t addrs_count = 1; 3018 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] + page_size < (uint64_t)end) { 3019 addrs[addrs_count] = addrs[addrs_count - 1] + page_size; 3020 addrs_count++; 3021 } 3022 3023 if (os::Solaris::meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) { 3024 return NULL; 3025 } 3026 3027 size_t i = 0; 3028 for (; i < addrs_count; i++) { 3029 if ((validity[i] & 1) != 0) { 3030 if ((validity[i] & 4) != 0) { 3031 if (outdata[types * i + 1] != page_expected->size) { 3032 break; 3033 } 3034 } else 3035 if (page_expected->size != 0) { 3036 break; 3037 } 3038 3039 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) { 3040 if (outdata[types * i] != page_expected->lgrp_id) { 3041 break; 3042 } 3043 } 3044 } else { 3045 return NULL; 3046 } 3047 } 3048 3049 if (i != addrs_count) { 3050 if ((validity[i] & 2) != 0) { 3051 page_found->lgrp_id = outdata[types * i]; 3052 } else { 3053 page_found->lgrp_id = -1; 3054 } 3055 if ((validity[i] & 4) != 0) { 3056 page_found->size = outdata[types * i + 1]; 3057 } else { 3058 page_found->size = 0; 3059 } 3060 return (char*)addrs[i]; 3061 } 3062 3063 p = addrs[addrs_count - 1] + page_size; 3064 } 3065 return end; 3066 } 3067 3068 bool os::pd_uncommit_memory(char* addr, size_t bytes) { 3069 size_t size = bytes; 3070 // Map uncommitted pages PROT_NONE so we fail early if we touch an 3071 // uncommitted page. Otherwise, the read/write might succeed if we 3072 // have enough swap space to back the physical page. 3073 return 3074 NULL != Solaris::mmap_chunk(addr, size, 3075 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, 3076 PROT_NONE); 3077 } 3078 3079 char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) { 3080 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0); 3081 3082 if (b == MAP_FAILED) { 3083 return NULL; 3084 } 3085 return b; 3086 } 3087 3088 char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes, size_t alignment_hint, bool fixed) { 3089 char* addr = requested_addr; 3090 int flags = MAP_PRIVATE | MAP_NORESERVE; 3091 3092 assert(!(fixed && (alignment_hint > 0)), "alignment hint meaningless with fixed mmap"); 3093 3094 if (fixed) { 3095 flags |= MAP_FIXED; 3096 } else if (has_map_align && (alignment_hint > (size_t) vm_page_size())) { 3097 flags |= MAP_ALIGN; 3098 addr = (char*) alignment_hint; 3099 } 3100 3101 // Map uncommitted pages PROT_NONE so we fail early if we touch an 3102 // uncommitted page. Otherwise, the read/write might succeed if we 3103 // have enough swap space to back the physical page. 3104 return mmap_chunk(addr, bytes, flags, PROT_NONE); 3105 } 3106 3107 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, size_t alignment_hint) { 3108 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint, (requested_addr != NULL)); 3109 3110 guarantee(requested_addr == NULL || requested_addr == addr, 3111 "OS failed to return requested mmap address."); 3112 return addr; 3113 } 3114 3115 // Reserve memory at an arbitrary address, only if that area is 3116 // available (and not reserved for something else). 3117 3118 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 3119 const int max_tries = 10; 3120 char* base[max_tries]; 3121 size_t size[max_tries]; 3122 3123 // Solaris adds a gap between mmap'ed regions. The size of the gap 3124 // is dependent on the requested size and the MMU. Our initial gap 3125 // value here is just a guess and will be corrected later. 3126 bool had_top_overlap = false; 3127 bool have_adjusted_gap = false; 3128 size_t gap = 0x400000; 3129 3130 // Assert only that the size is a multiple of the page size, since 3131 // that's all that mmap requires, and since that's all we really know 3132 // about at this low abstraction level. If we need higher alignment, 3133 // we can either pass an alignment to this method or verify alignment 3134 // in one of the methods further up the call chain. See bug 5044738. 3135 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); 3136 3137 // Since snv_84, Solaris attempts to honor the address hint - see 5003415. 3138 // Give it a try, if the kernel honors the hint we can return immediately. 3139 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false); 3140 3141 volatile int err = errno; 3142 if (addr == requested_addr) { 3143 return addr; 3144 } else if (addr != NULL) { 3145 pd_unmap_memory(addr, bytes); 3146 } 3147 3148 if (PrintMiscellaneous && Verbose) { 3149 char buf[256]; 3150 buf[0] = '\0'; 3151 if (addr == NULL) { 3152 jio_snprintf(buf, sizeof(buf), ": %s", strerror(err)); 3153 } 3154 warning("attempt_reserve_memory_at: couldn't reserve " SIZE_FORMAT " bytes at " 3155 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT 3156 "%s", bytes, requested_addr, addr, buf); 3157 } 3158 3159 // Address hint method didn't work. Fall back to the old method. 3160 // In theory, once SNV becomes our oldest supported platform, this 3161 // code will no longer be needed. 3162 // 3163 // Repeatedly allocate blocks until the block is allocated at the 3164 // right spot. Give up after max_tries. 3165 int i; 3166 for (i = 0; i < max_tries; ++i) { 3167 base[i] = reserve_memory(bytes); 3168 3169 if (base[i] != NULL) { 3170 // Is this the block we wanted? 3171 if (base[i] == requested_addr) { 3172 size[i] = bytes; 3173 break; 3174 } 3175 3176 // check that the gap value is right 3177 if (had_top_overlap && !have_adjusted_gap) { 3178 size_t actual_gap = base[i-1] - base[i] - bytes; 3179 if (gap != actual_gap) { 3180 // adjust the gap value and retry the last 2 allocations 3181 assert(i > 0, "gap adjustment code problem"); 3182 have_adjusted_gap = true; // adjust the gap only once, just in case 3183 gap = actual_gap; 3184 if (PrintMiscellaneous && Verbose) { 3185 warning("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap); 3186 } 3187 unmap_memory(base[i], bytes); 3188 unmap_memory(base[i-1], size[i-1]); 3189 i-=2; 3190 continue; 3191 } 3192 } 3193 3194 // Does this overlap the block we wanted? Give back the overlapped 3195 // parts and try again. 3196 // 3197 // There is still a bug in this code: if top_overlap == bytes, 3198 // the overlap is offset from requested region by the value of gap. 3199 // In this case giving back the overlapped part will not work, 3200 // because we'll give back the entire block at base[i] and 3201 // therefore the subsequent allocation will not generate a new gap. 3202 // This could be fixed with a new algorithm that used larger 3203 // or variable size chunks to find the requested region - 3204 // but such a change would introduce additional complications. 3205 // It's rare enough that the planets align for this bug, 3206 // so we'll just wait for a fix for 6204603/5003415 which 3207 // will provide a mmap flag to allow us to avoid this business. 3208 3209 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; 3210 if (top_overlap >= 0 && top_overlap < bytes) { 3211 had_top_overlap = true; 3212 unmap_memory(base[i], top_overlap); 3213 base[i] += top_overlap; 3214 size[i] = bytes - top_overlap; 3215 } else { 3216 size_t bottom_overlap = base[i] + bytes - requested_addr; 3217 if (bottom_overlap >= 0 && bottom_overlap < bytes) { 3218 if (PrintMiscellaneous && Verbose && bottom_overlap == 0) { 3219 warning("attempt_reserve_memory_at: possible alignment bug"); 3220 } 3221 unmap_memory(requested_addr, bottom_overlap); 3222 size[i] = bytes - bottom_overlap; 3223 } else { 3224 size[i] = bytes; 3225 } 3226 } 3227 } 3228 } 3229 3230 // Give back the unused reserved pieces. 3231 3232 for (int j = 0; j < i; ++j) { 3233 if (base[j] != NULL) { 3234 unmap_memory(base[j], size[j]); 3235 } 3236 } 3237 3238 return (i < max_tries) ? requested_addr : NULL; 3239 } 3240 3241 bool os::pd_release_memory(char* addr, size_t bytes) { 3242 size_t size = bytes; 3243 return munmap(addr, size) == 0; 3244 } 3245 3246 static bool solaris_mprotect(char* addr, size_t bytes, int prot) { 3247 assert(addr == (char*)align_size_down((uintptr_t)addr, os::vm_page_size()), 3248 "addr must be page aligned"); 3249 int retVal = mprotect(addr, bytes, prot); 3250 return retVal == 0; 3251 } 3252 3253 // Protect memory (Used to pass readonly pages through 3254 // JNI GetArray<type>Elements with empty arrays.) 3255 // Also, used for serialization page and for compressed oops null pointer 3256 // checking. 3257 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 3258 bool is_committed) { 3259 unsigned int p = 0; 3260 switch (prot) { 3261 case MEM_PROT_NONE: p = PROT_NONE; break; 3262 case MEM_PROT_READ: p = PROT_READ; break; 3263 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; 3264 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; 3265 default: 3266 ShouldNotReachHere(); 3267 } 3268 // is_committed is unused. 3269 return solaris_mprotect(addr, bytes, p); 3270 } 3271 3272 // guard_memory and unguard_memory only happens within stack guard pages. 3273 // Since ISM pertains only to the heap, guard and unguard memory should not 3274 /// happen with an ISM region. 3275 bool os::guard_memory(char* addr, size_t bytes) { 3276 return solaris_mprotect(addr, bytes, PROT_NONE); 3277 } 3278 3279 bool os::unguard_memory(char* addr, size_t bytes) { 3280 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE); 3281 } 3282 3283 // Large page support 3284 static size_t _large_page_size = 0; 3285 3286 // Insertion sort for small arrays (descending order). 3287 static void insertion_sort_descending(size_t* array, int len) { 3288 for (int i = 0; i < len; i++) { 3289 size_t val = array[i]; 3290 for (size_t key = i; key > 0 && array[key - 1] < val; --key) { 3291 size_t tmp = array[key]; 3292 array[key] = array[key - 1]; 3293 array[key - 1] = tmp; 3294 } 3295 } 3296 } 3297 3298 bool os::Solaris::mpss_sanity_check(bool warn, size_t* page_size) { 3299 const unsigned int usable_count = VM_Version::page_size_count(); 3300 if (usable_count == 1) { 3301 return false; 3302 } 3303 3304 // Find the right getpagesizes interface. When solaris 11 is the minimum 3305 // build platform, getpagesizes() (without the '2') can be called directly. 3306 typedef int (*gps_t)(size_t[], int); 3307 gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2")); 3308 if (gps_func == NULL) { 3309 gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes")); 3310 if (gps_func == NULL) { 3311 if (warn) { 3312 warning("MPSS is not supported by the operating system."); 3313 } 3314 return false; 3315 } 3316 } 3317 3318 // Fill the array of page sizes. 3319 int n = (*gps_func)(_page_sizes, page_sizes_max); 3320 assert(n > 0, "Solaris bug?"); 3321 3322 if (n == page_sizes_max) { 3323 // Add a sentinel value (necessary only if the array was completely filled 3324 // since it is static (zeroed at initialization)). 3325 _page_sizes[--n] = 0; 3326 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");) 3327 } 3328 assert(_page_sizes[n] == 0, "missing sentinel"); 3329 trace_page_sizes("available page sizes", _page_sizes, n); 3330 3331 if (n == 1) return false; // Only one page size available. 3332 3333 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and 3334 // select up to usable_count elements. First sort the array, find the first 3335 // acceptable value, then copy the usable sizes to the top of the array and 3336 // trim the rest. Make sure to include the default page size :-). 3337 // 3338 // A better policy could get rid of the 4M limit by taking the sizes of the 3339 // important VM memory regions (java heap and possibly the code cache) into 3340 // account. 3341 insertion_sort_descending(_page_sizes, n); 3342 const size_t size_limit = 3343 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes; 3344 int beg; 3345 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */ ; 3346 const int end = MIN2((int)usable_count, n) - 1; 3347 for (int cur = 0; cur < end; ++cur, ++beg) { 3348 _page_sizes[cur] = _page_sizes[beg]; 3349 } 3350 _page_sizes[end] = vm_page_size(); 3351 _page_sizes[end + 1] = 0; 3352 3353 if (_page_sizes[end] > _page_sizes[end - 1]) { 3354 // Default page size is not the smallest; sort again. 3355 insertion_sort_descending(_page_sizes, end + 1); 3356 } 3357 *page_size = _page_sizes[0]; 3358 3359 trace_page_sizes("usable page sizes", _page_sizes, end + 1); 3360 return true; 3361 } 3362 3363 void os::large_page_init() { 3364 if (UseLargePages) { 3365 // print a warning if any large page related flag is specified on command line 3366 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || 3367 !FLAG_IS_DEFAULT(LargePageSizeInBytes); 3368 3369 UseLargePages = Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size); 3370 } 3371 } 3372 3373 bool os::Solaris::setup_large_pages(caddr_t start, size_t bytes, size_t align) { 3374 // Signal to OS that we want large pages for addresses 3375 // from addr, addr + bytes 3376 struct memcntl_mha mpss_struct; 3377 mpss_struct.mha_cmd = MHA_MAPSIZE_VA; 3378 mpss_struct.mha_pagesize = align; 3379 mpss_struct.mha_flags = 0; 3380 // Upon successful completion, memcntl() returns 0 3381 if (memcntl(start, bytes, MC_HAT_ADVISE, (caddr_t) &mpss_struct, 0, 0)) { 3382 debug_only(warning("Attempt to use MPSS failed.")); 3383 return false; 3384 } 3385 return true; 3386 } 3387 3388 char* os::reserve_memory_special(size_t size, size_t alignment, char* addr, bool exec) { 3389 fatal("os::reserve_memory_special should not be called on Solaris."); 3390 return NULL; 3391 } 3392 3393 bool os::release_memory_special(char* base, size_t bytes) { 3394 fatal("os::release_memory_special should not be called on Solaris."); 3395 return false; 3396 } 3397 3398 size_t os::large_page_size() { 3399 return _large_page_size; 3400 } 3401 3402 // MPSS allows application to commit large page memory on demand; with ISM 3403 // the entire memory region must be allocated as shared memory. 3404 bool os::can_commit_large_page_memory() { 3405 return true; 3406 } 3407 3408 bool os::can_execute_large_page_memory() { 3409 return true; 3410 } 3411 3412 static int os_sleep(jlong millis, bool interruptible) { 3413 const jlong limit = INT_MAX; 3414 jlong prevtime; 3415 int res; 3416 3417 while (millis > limit) { 3418 if ((res = os_sleep(limit, interruptible)) != OS_OK) 3419 return res; 3420 millis -= limit; 3421 } 3422 3423 // Restart interrupted polls with new parameters until the proper delay 3424 // has been completed. 3425 3426 prevtime = getTimeMillis(); 3427 3428 while (millis > 0) { 3429 jlong newtime; 3430 3431 if (!interruptible) { 3432 // Following assert fails for os::yield_all: 3433 // assert(!thread->is_Java_thread(), "must not be java thread"); 3434 res = poll(NULL, 0, millis); 3435 } else { 3436 JavaThread *jt = JavaThread::current(); 3437 3438 INTERRUPTIBLE_NORESTART_VM_ALWAYS(poll(NULL, 0, millis), res, jt, 3439 os::Solaris::clear_interrupted); 3440 } 3441 3442 // INTERRUPTIBLE_NORESTART_VM_ALWAYS returns res == OS_INTRPT for 3443 // thread.Interrupt. 3444 3445 // See c/r 6751923. Poll can return 0 before time 3446 // has elapsed if time is set via clock_settime (as NTP does). 3447 // res == 0 if poll timed out (see man poll RETURN VALUES) 3448 // using the logic below checks that we really did 3449 // sleep at least "millis" if not we'll sleep again. 3450 if( ( res == 0 ) || ((res == OS_ERR) && (errno == EINTR))) { 3451 newtime = getTimeMillis(); 3452 assert(newtime >= prevtime, "time moving backwards"); 3453 /* Doing prevtime and newtime in microseconds doesn't help precision, 3454 and trying to round up to avoid lost milliseconds can result in a 3455 too-short delay. */ 3456 millis -= newtime - prevtime; 3457 if(millis <= 0) 3458 return OS_OK; 3459 prevtime = newtime; 3460 } else 3461 return res; 3462 } 3463 3464 return OS_OK; 3465 } 3466 3467 // Read calls from inside the vm need to perform state transitions 3468 size_t os::read(int fd, void *buf, unsigned int nBytes) { 3469 INTERRUPTIBLE_RETURN_INT_VM(::read(fd, buf, nBytes), os::Solaris::clear_interrupted); 3470 } 3471 3472 size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) { 3473 INTERRUPTIBLE_RETURN_INT(::read(fd, buf, nBytes), os::Solaris::clear_interrupted); 3474 } 3475 3476 int os::sleep(Thread* thread, jlong millis, bool interruptible) { 3477 assert(thread == Thread::current(), "thread consistency check"); 3478 3479 // TODO-FIXME: this should be removed. 3480 // On Solaris machines (especially 2.5.1) we found that sometimes the VM gets into a live lock 3481 // situation with a JavaThread being starved out of a lwp. The kernel doesn't seem to generate 3482 // a SIGWAITING signal which would enable the threads library to create a new lwp for the starving 3483 // thread. We suspect that because the Watcher thread keeps waking up at periodic intervals the kernel 3484 // is fooled into believing that the system is making progress. In the code below we block the 3485 // the watcher thread while safepoint is in progress so that it would not appear as though the 3486 // system is making progress. 3487 if (!Solaris::T2_libthread() && 3488 thread->is_Watcher_thread() && SafepointSynchronize::is_synchronizing() && !Arguments::has_profile()) { 3489 // We now try to acquire the threads lock. Since this lock is held by the VM thread during 3490 // the entire safepoint, the watcher thread will line up here during the safepoint. 3491 Threads_lock->lock_without_safepoint_check(); 3492 Threads_lock->unlock(); 3493 } 3494 3495 if (thread->is_Java_thread()) { 3496 // This is a JavaThread so we honor the _thread_blocked protocol 3497 // even for sleeps of 0 milliseconds. This was originally done 3498 // as a workaround for bug 4338139. However, now we also do it 3499 // to honor the suspend-equivalent protocol. 3500 3501 JavaThread *jt = (JavaThread *) thread; 3502 ThreadBlockInVM tbivm(jt); 3503 3504 jt->set_suspend_equivalent(); 3505 // cleared by handle_special_suspend_equivalent_condition() or 3506 // java_suspend_self() via check_and_wait_while_suspended() 3507 3508 int ret_code; 3509 if (millis <= 0) { 3510 thr_yield(); 3511 ret_code = 0; 3512 } else { 3513 // The original sleep() implementation did not create an 3514 // OSThreadWaitState helper for sleeps of 0 milliseconds. 3515 // I'm preserving that decision for now. 3516 OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */); 3517 3518 ret_code = os_sleep(millis, interruptible); 3519 } 3520 3521 // were we externally suspended while we were waiting? 3522 jt->check_and_wait_while_suspended(); 3523 3524 return ret_code; 3525 } 3526 3527 // non-JavaThread from this point on: 3528 3529 if (millis <= 0) { 3530 thr_yield(); 3531 return 0; 3532 } 3533 3534 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 3535 3536 return os_sleep(millis, interruptible); 3537 } 3538 3539 int os::naked_sleep() { 3540 // %% make the sleep time an integer flag. for now use 1 millisec. 3541 return os_sleep(1, false); 3542 } 3543 3544 // Sleep forever; naked call to OS-specific sleep; use with CAUTION 3545 void os::infinite_sleep() { 3546 while (true) { // sleep forever ... 3547 ::sleep(100); // ... 100 seconds at a time 3548 } 3549 } 3550 3551 // Used to convert frequent JVM_Yield() to nops 3552 bool os::dont_yield() { 3553 if (DontYieldALot) { 3554 static hrtime_t last_time = 0; 3555 hrtime_t diff = getTimeNanos() - last_time; 3556 3557 if (diff < DontYieldALotInterval * 1000000) 3558 return true; 3559 3560 last_time += diff; 3561 3562 return false; 3563 } 3564 else { 3565 return false; 3566 } 3567 } 3568 3569 // Caveat: Solaris os::yield() causes a thread-state transition whereas 3570 // the linux and win32 implementations do not. This should be checked. 3571 3572 void os::yield() { 3573 // Yields to all threads with same or greater priority 3574 os::sleep(Thread::current(), 0, false); 3575 } 3576 3577 // Note that yield semantics are defined by the scheduling class to which 3578 // the thread currently belongs. Typically, yield will _not yield to 3579 // other equal or higher priority threads that reside on the dispatch queues 3580 // of other CPUs. 3581 3582 os::YieldResult os::NakedYield() { thr_yield(); return os::YIELD_UNKNOWN; } 3583 3584 3585 // On Solaris we found that yield_all doesn't always yield to all other threads. 3586 // There have been cases where there is a thread ready to execute but it doesn't 3587 // get an lwp as the VM thread continues to spin with sleeps of 1 millisecond. 3588 // The 1 millisecond wait doesn't seem long enough for the kernel to issue a 3589 // SIGWAITING signal which will cause a new lwp to be created. So we count the 3590 // number of times yield_all is called in the one loop and increase the sleep 3591 // time after 8 attempts. If this fails too we increase the concurrency level 3592 // so that the starving thread would get an lwp 3593 3594 void os::yield_all(int attempts) { 3595 // Yields to all threads, including threads with lower priorities 3596 if (attempts == 0) { 3597 os::sleep(Thread::current(), 1, false); 3598 } else { 3599 int iterations = attempts % 30; 3600 if (iterations == 0 && !os::Solaris::T2_libthread()) { 3601 // thr_setconcurrency and _getconcurrency make sense only under T1. 3602 int noofLWPS = thr_getconcurrency(); 3603 if (noofLWPS < (Threads::number_of_threads() + 2)) { 3604 thr_setconcurrency(thr_getconcurrency() + 1); 3605 } 3606 } else if (iterations < 25) { 3607 os::sleep(Thread::current(), 1, false); 3608 } else { 3609 os::sleep(Thread::current(), 10, false); 3610 } 3611 } 3612 } 3613 3614 // Called from the tight loops to possibly influence time-sharing heuristics 3615 void os::loop_breaker(int attempts) { 3616 os::yield_all(attempts); 3617 } 3618 3619 3620 // Interface for setting lwp priorities. If we are using T2 libthread, 3621 // which forces the use of BoundThreads or we manually set UseBoundThreads, 3622 // all of our threads will be assigned to real lwp's. Using the thr_setprio 3623 // function is meaningless in this mode so we must adjust the real lwp's priority 3624 // The routines below implement the getting and setting of lwp priorities. 3625 // 3626 // Note: There are three priority scales used on Solaris. Java priotities 3627 // which range from 1 to 10, libthread "thr_setprio" scale which range 3628 // from 0 to 127, and the current scheduling class of the process we 3629 // are running in. This is typically from -60 to +60. 3630 // The setting of the lwp priorities in done after a call to thr_setprio 3631 // so Java priorities are mapped to libthread priorities and we map from 3632 // the latter to lwp priorities. We don't keep priorities stored in 3633 // Java priorities since some of our worker threads want to set priorities 3634 // higher than all Java threads. 3635 // 3636 // For related information: 3637 // (1) man -s 2 priocntl 3638 // (2) man -s 4 priocntl 3639 // (3) man dispadmin 3640 // = librt.so 3641 // = libthread/common/rtsched.c - thrp_setlwpprio(). 3642 // = ps -cL <pid> ... to validate priority. 3643 // = sched_get_priority_min and _max 3644 // pthread_create 3645 // sched_setparam 3646 // pthread_setschedparam 3647 // 3648 // Assumptions: 3649 // + We assume that all threads in the process belong to the same 3650 // scheduling class. IE. an homogenous process. 3651 // + Must be root or in IA group to change change "interactive" attribute. 3652 // Priocntl() will fail silently. The only indication of failure is when 3653 // we read-back the value and notice that it hasn't changed. 3654 // + Interactive threads enter the runq at the head, non-interactive at the tail. 3655 // + For RT, change timeslice as well. Invariant: 3656 // constant "priority integral" 3657 // Konst == TimeSlice * (60-Priority) 3658 // Given a priority, compute appropriate timeslice. 3659 // + Higher numerical values have higher priority. 3660 3661 // sched class attributes 3662 typedef struct { 3663 int schedPolicy; // classID 3664 int maxPrio; 3665 int minPrio; 3666 } SchedInfo; 3667 3668 3669 static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits; 3670 3671 #ifdef ASSERT 3672 static int ReadBackValidate = 1; 3673 #endif 3674 static int myClass = 0; 3675 static int myMin = 0; 3676 static int myMax = 0; 3677 static int myCur = 0; 3678 static bool priocntl_enable = false; 3679 3680 static const int criticalPrio = 60; // FX/60 is critical thread class/priority on T4 3681 static int java_MaxPriority_to_os_priority = 0; // Saved mapping 3682 3683 3684 // lwp_priocntl_init 3685 // 3686 // Try to determine the priority scale for our process. 3687 // 3688 // Return errno or 0 if OK. 3689 // 3690 static int lwp_priocntl_init () { 3691 int rslt; 3692 pcinfo_t ClassInfo; 3693 pcparms_t ParmInfo; 3694 int i; 3695 3696 if (!UseThreadPriorities) return 0; 3697 3698 // We are using Bound threads, we need to determine our priority ranges 3699 if (os::Solaris::T2_libthread() || UseBoundThreads) { 3700 // If ThreadPriorityPolicy is 1, switch tables 3701 if (ThreadPriorityPolicy == 1) { 3702 for (i = 0 ; i < CriticalPriority+1; i++) 3703 os::java_to_os_priority[i] = prio_policy1[i]; 3704 } 3705 if (UseCriticalJavaThreadPriority) { 3706 // MaxPriority always maps to the FX scheduling class and criticalPrio. 3707 // See set_native_priority() and set_lwp_class_and_priority(). 3708 // Save original MaxPriority mapping in case attempt to 3709 // use critical priority fails. 3710 java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority]; 3711 // Set negative to distinguish from other priorities 3712 os::java_to_os_priority[MaxPriority] = -criticalPrio; 3713 } 3714 } 3715 // Not using Bound Threads, set to ThreadPolicy 1 3716 else { 3717 for ( i = 0 ; i < CriticalPriority+1; i++ ) { 3718 os::java_to_os_priority[i] = prio_policy1[i]; 3719 } 3720 return 0; 3721 } 3722 3723 // Get IDs for a set of well-known scheduling classes. 3724 // TODO-FIXME: GETCLINFO returns the current # of classes in the 3725 // the system. We should have a loop that iterates over the 3726 // classID values, which are known to be "small" integers. 3727 3728 strcpy(ClassInfo.pc_clname, "TS"); 3729 ClassInfo.pc_cid = -1; 3730 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3731 if (rslt < 0) return errno; 3732 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1"); 3733 tsLimits.schedPolicy = ClassInfo.pc_cid; 3734 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri; 3735 tsLimits.minPrio = -tsLimits.maxPrio; 3736 3737 strcpy(ClassInfo.pc_clname, "IA"); 3738 ClassInfo.pc_cid = -1; 3739 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3740 if (rslt < 0) return errno; 3741 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1"); 3742 iaLimits.schedPolicy = ClassInfo.pc_cid; 3743 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri; 3744 iaLimits.minPrio = -iaLimits.maxPrio; 3745 3746 strcpy(ClassInfo.pc_clname, "RT"); 3747 ClassInfo.pc_cid = -1; 3748 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3749 if (rslt < 0) return errno; 3750 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1"); 3751 rtLimits.schedPolicy = ClassInfo.pc_cid; 3752 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri; 3753 rtLimits.minPrio = 0; 3754 3755 strcpy(ClassInfo.pc_clname, "FX"); 3756 ClassInfo.pc_cid = -1; 3757 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3758 if (rslt < 0) return errno; 3759 assert(ClassInfo.pc_cid != -1, "cid for FX class is -1"); 3760 fxLimits.schedPolicy = ClassInfo.pc_cid; 3761 fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri; 3762 fxLimits.minPrio = 0; 3763 3764 // Query our "current" scheduling class. 3765 // This will normally be IA, TS or, rarely, FX or RT. 3766 memset(&ParmInfo, 0, sizeof(ParmInfo)); 3767 ParmInfo.pc_cid = PC_CLNULL; 3768 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo); 3769 if (rslt < 0) return errno; 3770 myClass = ParmInfo.pc_cid; 3771 3772 // We now know our scheduling classId, get specific information 3773 // about the class. 3774 ClassInfo.pc_cid = myClass; 3775 ClassInfo.pc_clname[0] = 0; 3776 rslt = priocntl((idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo); 3777 if (rslt < 0) return errno; 3778 3779 if (ThreadPriorityVerbose) { 3780 tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname); 3781 } 3782 3783 memset(&ParmInfo, 0, sizeof(pcparms_t)); 3784 ParmInfo.pc_cid = PC_CLNULL; 3785 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo); 3786 if (rslt < 0) return errno; 3787 3788 if (ParmInfo.pc_cid == rtLimits.schedPolicy) { 3789 myMin = rtLimits.minPrio; 3790 myMax = rtLimits.maxPrio; 3791 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { 3792 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms; 3793 myMin = iaLimits.minPrio; 3794 myMax = iaLimits.maxPrio; 3795 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict 3796 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { 3797 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms; 3798 myMin = tsLimits.minPrio; 3799 myMax = tsLimits.maxPrio; 3800 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict 3801 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) { 3802 fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms; 3803 myMin = fxLimits.minPrio; 3804 myMax = fxLimits.maxPrio; 3805 myMax = MIN2(myMax, (int)fxInfo->fx_uprilim); // clamp - restrict 3806 } else { 3807 // No clue - punt 3808 if (ThreadPriorityVerbose) 3809 tty->print_cr ("Unknown scheduling class: %s ... \n", ClassInfo.pc_clname); 3810 return EINVAL; // no clue, punt 3811 } 3812 3813 if (ThreadPriorityVerbose) { 3814 tty->print_cr ("Thread priority Range: [%d..%d]\n", myMin, myMax); 3815 } 3816 3817 priocntl_enable = true; // Enable changing priorities 3818 return 0; 3819 } 3820 3821 #define IAPRI(x) ((iaparms_t *)((x).pc_clparms)) 3822 #define RTPRI(x) ((rtparms_t *)((x).pc_clparms)) 3823 #define TSPRI(x) ((tsparms_t *)((x).pc_clparms)) 3824 #define FXPRI(x) ((fxparms_t *)((x).pc_clparms)) 3825 3826 3827 // scale_to_lwp_priority 3828 // 3829 // Convert from the libthread "thr_setprio" scale to our current 3830 // lwp scheduling class scale. 3831 // 3832 static 3833 int scale_to_lwp_priority (int rMin, int rMax, int x) 3834 { 3835 int v; 3836 3837 if (x == 127) return rMax; // avoid round-down 3838 v = (((x*(rMax-rMin)))/128)+rMin; 3839 return v; 3840 } 3841 3842 3843 // set_lwp_class_and_priority 3844 // 3845 // Set the class and priority of the lwp. This call should only 3846 // be made when using bound threads (T2 threads are bound by default). 3847 // 3848 int set_lwp_class_and_priority(int ThreadID, int lwpid, 3849 int newPrio, int new_class, bool scale) { 3850 int rslt; 3851 int Actual, Expected, prv; 3852 pcparms_t ParmInfo; // for GET-SET 3853 #ifdef ASSERT 3854 pcparms_t ReadBack; // for readback 3855 #endif 3856 3857 // Set priority via PC_GETPARMS, update, PC_SETPARMS 3858 // Query current values. 3859 // TODO: accelerate this by eliminating the PC_GETPARMS call. 3860 // Cache "pcparms_t" in global ParmCache. 3861 // TODO: elide set-to-same-value 3862 3863 // If something went wrong on init, don't change priorities. 3864 if ( !priocntl_enable ) { 3865 if (ThreadPriorityVerbose) 3866 tty->print_cr("Trying to set priority but init failed, ignoring"); 3867 return EINVAL; 3868 } 3869 3870 // If lwp hasn't started yet, just return 3871 // the _start routine will call us again. 3872 if ( lwpid <= 0 ) { 3873 if (ThreadPriorityVerbose) { 3874 tty->print_cr ("deferring the set_lwp_class_and_priority of thread " 3875 INTPTR_FORMAT " to %d, lwpid not set", 3876 ThreadID, newPrio); 3877 } 3878 return 0; 3879 } 3880 3881 if (ThreadPriorityVerbose) { 3882 tty->print_cr ("set_lwp_class_and_priority(" 3883 INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ", 3884 ThreadID, lwpid, newPrio); 3885 } 3886 3887 memset(&ParmInfo, 0, sizeof(pcparms_t)); 3888 ParmInfo.pc_cid = PC_CLNULL; 3889 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo); 3890 if (rslt < 0) return errno; 3891 3892 int cur_class = ParmInfo.pc_cid; 3893 ParmInfo.pc_cid = (id_t)new_class; 3894 3895 if (new_class == rtLimits.schedPolicy) { 3896 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms; 3897 rtInfo->rt_pri = scale ? scale_to_lwp_priority(rtLimits.minPrio, 3898 rtLimits.maxPrio, newPrio) 3899 : newPrio; 3900 rtInfo->rt_tqsecs = RT_NOCHANGE; 3901 rtInfo->rt_tqnsecs = RT_NOCHANGE; 3902 if (ThreadPriorityVerbose) { 3903 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri); 3904 } 3905 } else if (new_class == iaLimits.schedPolicy) { 3906 iaparms_t* iaInfo = (iaparms_t*)ParmInfo.pc_clparms; 3907 int maxClamped = MIN2(iaLimits.maxPrio, 3908 cur_class == new_class 3909 ? (int)iaInfo->ia_uprilim : iaLimits.maxPrio); 3910 iaInfo->ia_upri = scale ? scale_to_lwp_priority(iaLimits.minPrio, 3911 maxClamped, newPrio) 3912 : newPrio; 3913 iaInfo->ia_uprilim = cur_class == new_class 3914 ? IA_NOCHANGE : (pri_t)iaLimits.maxPrio; 3915 iaInfo->ia_mode = IA_NOCHANGE; 3916 if (ThreadPriorityVerbose) { 3917 tty->print_cr("IA: [%d...%d] %d->%d\n", 3918 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri); 3919 } 3920 } else if (new_class == tsLimits.schedPolicy) { 3921 tsparms_t* tsInfo = (tsparms_t*)ParmInfo.pc_clparms; 3922 int maxClamped = MIN2(tsLimits.maxPrio, 3923 cur_class == new_class 3924 ? (int)tsInfo->ts_uprilim : tsLimits.maxPrio); 3925 tsInfo->ts_upri = scale ? scale_to_lwp_priority(tsLimits.minPrio, 3926 maxClamped, newPrio) 3927 : newPrio; 3928 tsInfo->ts_uprilim = cur_class == new_class 3929 ? TS_NOCHANGE : (pri_t)tsLimits.maxPrio; 3930 if (ThreadPriorityVerbose) { 3931 tty->print_cr("TS: [%d...%d] %d->%d\n", 3932 tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri); 3933 } 3934 } else if (new_class == fxLimits.schedPolicy) { 3935 fxparms_t* fxInfo = (fxparms_t*)ParmInfo.pc_clparms; 3936 int maxClamped = MIN2(fxLimits.maxPrio, 3937 cur_class == new_class 3938 ? (int)fxInfo->fx_uprilim : fxLimits.maxPrio); 3939 fxInfo->fx_upri = scale ? scale_to_lwp_priority(fxLimits.minPrio, 3940 maxClamped, newPrio) 3941 : newPrio; 3942 fxInfo->fx_uprilim = cur_class == new_class 3943 ? FX_NOCHANGE : (pri_t)fxLimits.maxPrio; 3944 fxInfo->fx_tqsecs = FX_NOCHANGE; 3945 fxInfo->fx_tqnsecs = FX_NOCHANGE; 3946 if (ThreadPriorityVerbose) { 3947 tty->print_cr("FX: [%d...%d] %d->%d\n", 3948 fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri); 3949 } 3950 } else { 3951 if (ThreadPriorityVerbose) { 3952 tty->print_cr("Unknown new scheduling class %d\n", new_class); 3953 } 3954 return EINVAL; // no clue, punt 3955 } 3956 3957 rslt = priocntl(P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo); 3958 if (ThreadPriorityVerbose && rslt) { 3959 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno); 3960 } 3961 if (rslt < 0) return errno; 3962 3963 #ifdef ASSERT 3964 // Sanity check: read back what we just attempted to set. 3965 // In theory it could have changed in the interim ... 3966 // 3967 // The priocntl system call is tricky. 3968 // Sometimes it'll validate the priority value argument and 3969 // return EINVAL if unhappy. At other times it fails silently. 3970 // Readbacks are prudent. 3971 3972 if (!ReadBackValidate) return 0; 3973 3974 memset(&ReadBack, 0, sizeof(pcparms_t)); 3975 ReadBack.pc_cid = PC_CLNULL; 3976 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack); 3977 assert(rslt >= 0, "priocntl failed"); 3978 Actual = Expected = 0xBAD; 3979 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match"); 3980 if (ParmInfo.pc_cid == rtLimits.schedPolicy) { 3981 Actual = RTPRI(ReadBack)->rt_pri; 3982 Expected = RTPRI(ParmInfo)->rt_pri; 3983 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { 3984 Actual = IAPRI(ReadBack)->ia_upri; 3985 Expected = IAPRI(ParmInfo)->ia_upri; 3986 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { 3987 Actual = TSPRI(ReadBack)->ts_upri; 3988 Expected = TSPRI(ParmInfo)->ts_upri; 3989 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) { 3990 Actual = FXPRI(ReadBack)->fx_upri; 3991 Expected = FXPRI(ParmInfo)->fx_upri; 3992 } else { 3993 if (ThreadPriorityVerbose) { 3994 tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n", 3995 ParmInfo.pc_cid); 3996 } 3997 } 3998 3999 if (Actual != Expected) { 4000 if (ThreadPriorityVerbose) { 4001 tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n", 4002 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected); 4003 } 4004 } 4005 #endif 4006 4007 return 0; 4008 } 4009 4010 // Solaris only gives access to 128 real priorities at a time, 4011 // so we expand Java's ten to fill this range. This would be better 4012 // if we dynamically adjusted relative priorities. 4013 // 4014 // The ThreadPriorityPolicy option allows us to select 2 different 4015 // priority scales. 4016 // 4017 // ThreadPriorityPolicy=0 4018 // Since the Solaris' default priority is MaximumPriority, we do not 4019 // set a priority lower than Max unless a priority lower than 4020 // NormPriority is requested. 4021 // 4022 // ThreadPriorityPolicy=1 4023 // This mode causes the priority table to get filled with 4024 // linear values. NormPriority get's mapped to 50% of the 4025 // Maximum priority an so on. This will cause VM threads 4026 // to get unfair treatment against other Solaris processes 4027 // which do not explicitly alter their thread priorities. 4028 // 4029 4030 int os::java_to_os_priority[CriticalPriority + 1] = { 4031 -99999, // 0 Entry should never be used 4032 4033 0, // 1 MinPriority 4034 32, // 2 4035 64, // 3 4036 4037 96, // 4 4038 127, // 5 NormPriority 4039 127, // 6 4040 4041 127, // 7 4042 127, // 8 4043 127, // 9 NearMaxPriority 4044 4045 127, // 10 MaxPriority 4046 4047 -criticalPrio // 11 CriticalPriority 4048 }; 4049 4050 OSReturn os::set_native_priority(Thread* thread, int newpri) { 4051 OSThread* osthread = thread->osthread(); 4052 4053 // Save requested priority in case the thread hasn't been started 4054 osthread->set_native_priority(newpri); 4055 4056 // Check for critical priority request 4057 bool fxcritical = false; 4058 if (newpri == -criticalPrio) { 4059 fxcritical = true; 4060 newpri = criticalPrio; 4061 } 4062 4063 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping"); 4064 if (!UseThreadPriorities) return OS_OK; 4065 4066 int status = 0; 4067 4068 if (!fxcritical) { 4069 // Use thr_setprio only if we have a priority that thr_setprio understands 4070 status = thr_setprio(thread->osthread()->thread_id(), newpri); 4071 } 4072 4073 if (os::Solaris::T2_libthread() || 4074 (UseBoundThreads && osthread->is_vm_created())) { 4075 int lwp_status = 4076 set_lwp_class_and_priority(osthread->thread_id(), 4077 osthread->lwp_id(), 4078 newpri, 4079 fxcritical ? fxLimits.schedPolicy : myClass, 4080 !fxcritical); 4081 if (lwp_status != 0 && fxcritical) { 4082 // Try again, this time without changing the scheduling class 4083 newpri = java_MaxPriority_to_os_priority; 4084 lwp_status = set_lwp_class_and_priority(osthread->thread_id(), 4085 osthread->lwp_id(), 4086 newpri, myClass, false); 4087 } 4088 status |= lwp_status; 4089 } 4090 return (status == 0) ? OS_OK : OS_ERR; 4091 } 4092 4093 4094 OSReturn os::get_native_priority(const Thread* const thread, int *priority_ptr) { 4095 int p; 4096 if ( !UseThreadPriorities ) { 4097 *priority_ptr = NormalPriority; 4098 return OS_OK; 4099 } 4100 int status = thr_getprio(thread->osthread()->thread_id(), &p); 4101 if (status != 0) { 4102 return OS_ERR; 4103 } 4104 *priority_ptr = p; 4105 return OS_OK; 4106 } 4107 4108 4109 // Hint to the underlying OS that a task switch would not be good. 4110 // Void return because it's a hint and can fail. 4111 void os::hint_no_preempt() { 4112 schedctl_start(schedctl_init()); 4113 } 4114 4115 static void resume_clear_context(OSThread *osthread) { 4116 osthread->set_ucontext(NULL); 4117 } 4118 4119 static void suspend_save_context(OSThread *osthread, ucontext_t* context) { 4120 osthread->set_ucontext(context); 4121 } 4122 4123 static Semaphore sr_semaphore; 4124 4125 void os::Solaris::SR_handler(Thread* thread, ucontext_t* uc) { 4126 // Save and restore errno to avoid confusing native code with EINTR 4127 // after sigsuspend. 4128 int old_errno = errno; 4129 4130 OSThread* osthread = thread->osthread(); 4131 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); 4132 4133 os::SuspendResume::State current = osthread->sr.state(); 4134 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { 4135 suspend_save_context(osthread, uc); 4136 4137 // attempt to switch the state, we assume we had a SUSPEND_REQUEST 4138 os::SuspendResume::State state = osthread->sr.suspended(); 4139 if (state == os::SuspendResume::SR_SUSPENDED) { 4140 sigset_t suspend_set; // signals for sigsuspend() 4141 4142 // get current set of blocked signals and unblock resume signal 4143 thr_sigsetmask(SIG_BLOCK, NULL, &suspend_set); 4144 sigdelset(&suspend_set, os::Solaris::SIGasync()); 4145 4146 sr_semaphore.signal(); 4147 // wait here until we are resumed 4148 while (1) { 4149 sigsuspend(&suspend_set); 4150 4151 os::SuspendResume::State result = osthread->sr.running(); 4152 if (result == os::SuspendResume::SR_RUNNING) { 4153 sr_semaphore.signal(); 4154 break; 4155 } 4156 } 4157 4158 } else if (state == os::SuspendResume::SR_RUNNING) { 4159 // request was cancelled, continue 4160 } else { 4161 ShouldNotReachHere(); 4162 } 4163 4164 resume_clear_context(osthread); 4165 } else if (current == os::SuspendResume::SR_RUNNING) { 4166 // request was cancelled, continue 4167 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { 4168 // ignore 4169 } else { 4170 // ignore 4171 } 4172 4173 errno = old_errno; 4174 } 4175 4176 4177 void os::interrupt(Thread* thread) { 4178 assert(Thread::current() == thread || Threads_lock->owned_by_self(), "possibility of dangling Thread pointer"); 4179 4180 OSThread* osthread = thread->osthread(); 4181 4182 int isInterrupted = osthread->interrupted(); 4183 if (!isInterrupted) { 4184 osthread->set_interrupted(true); 4185 OrderAccess::fence(); 4186 // os::sleep() is implemented with either poll (NULL,0,timeout) or 4187 // by parking on _SleepEvent. If the former, thr_kill will unwedge 4188 // the sleeper by SIGINTR, otherwise the unpark() will wake the sleeper. 4189 ParkEvent * const slp = thread->_SleepEvent ; 4190 if (slp != NULL) slp->unpark() ; 4191 } 4192 4193 // For JSR166: unpark after setting status but before thr_kill -dl 4194 if (thread->is_Java_thread()) { 4195 ((JavaThread*)thread)->parker()->unpark(); 4196 } 4197 4198 // Handle interruptible wait() ... 4199 ParkEvent * const ev = thread->_ParkEvent ; 4200 if (ev != NULL) ev->unpark() ; 4201 4202 // When events are used everywhere for os::sleep, then this thr_kill 4203 // will only be needed if UseVMInterruptibleIO is true. 4204 4205 if (!isInterrupted) { 4206 int status = thr_kill(osthread->thread_id(), os::Solaris::SIGinterrupt()); 4207 assert_status(status == 0, status, "thr_kill"); 4208 4209 // Bump thread interruption counter 4210 RuntimeService::record_thread_interrupt_signaled_count(); 4211 } 4212 } 4213 4214 4215 bool os::is_interrupted(Thread* thread, bool clear_interrupted) { 4216 assert(Thread::current() == thread || Threads_lock->owned_by_self(), "possibility of dangling Thread pointer"); 4217 4218 OSThread* osthread = thread->osthread(); 4219 4220 bool res = osthread->interrupted(); 4221 4222 // NOTE that since there is no "lock" around these two operations, 4223 // there is the possibility that the interrupted flag will be 4224 // "false" but that the interrupt event will be set. This is 4225 // intentional. The effect of this is that Object.wait() will appear 4226 // to have a spurious wakeup, which is not harmful, and the 4227 // possibility is so rare that it is not worth the added complexity 4228 // to add yet another lock. It has also been recommended not to put 4229 // the interrupted flag into the os::Solaris::Event structure, 4230 // because it hides the issue. 4231 if (res && clear_interrupted) { 4232 osthread->set_interrupted(false); 4233 } 4234 return res; 4235 } 4236 4237 4238 void os::print_statistics() { 4239 } 4240 4241 int os::message_box(const char* title, const char* message) { 4242 int i; 4243 fdStream err(defaultStream::error_fd()); 4244 for (i = 0; i < 78; i++) err.print_raw("="); 4245 err.cr(); 4246 err.print_raw_cr(title); 4247 for (i = 0; i < 78; i++) err.print_raw("-"); 4248 err.cr(); 4249 err.print_raw_cr(message); 4250 for (i = 0; i < 78; i++) err.print_raw("="); 4251 err.cr(); 4252 4253 char buf[16]; 4254 // Prevent process from exiting upon "read error" without consuming all CPU 4255 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 4256 4257 return buf[0] == 'y' || buf[0] == 'Y'; 4258 } 4259 4260 static int sr_notify(OSThread* osthread) { 4261 int status = thr_kill(osthread->thread_id(), os::Solaris::SIGasync()); 4262 assert_status(status == 0, status, "thr_kill"); 4263 return status; 4264 } 4265 4266 // "Randomly" selected value for how long we want to spin 4267 // before bailing out on suspending a thread, also how often 4268 // we send a signal to a thread we want to resume 4269 static const int RANDOMLY_LARGE_INTEGER = 1000000; 4270 static const int RANDOMLY_LARGE_INTEGER2 = 100; 4271 4272 static bool do_suspend(OSThread* osthread) { 4273 assert(osthread->sr.is_running(), "thread should be running"); 4274 assert(!sr_semaphore.trywait(), "semaphore has invalid state"); 4275 4276 // mark as suspended and send signal 4277 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { 4278 // failed to switch, state wasn't running? 4279 ShouldNotReachHere(); 4280 return false; 4281 } 4282 4283 if (sr_notify(osthread) != 0) { 4284 ShouldNotReachHere(); 4285 } 4286 4287 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED 4288 while (true) { 4289 if (sr_semaphore.timedwait(0, 2000 * NANOSECS_PER_MILLISEC)) { 4290 break; 4291 } else { 4292 // timeout 4293 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); 4294 if (cancelled == os::SuspendResume::SR_RUNNING) { 4295 return false; 4296 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { 4297 // make sure that we consume the signal on the semaphore as well 4298 sr_semaphore.wait(); 4299 break; 4300 } else { 4301 ShouldNotReachHere(); 4302 return false; 4303 } 4304 } 4305 } 4306 4307 guarantee(osthread->sr.is_suspended(), "Must be suspended"); 4308 return true; 4309 } 4310 4311 static void do_resume(OSThread* osthread) { 4312 assert(osthread->sr.is_suspended(), "thread should be suspended"); 4313 assert(!sr_semaphore.trywait(), "invalid semaphore state"); 4314 4315 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { 4316 // failed to switch to WAKEUP_REQUEST 4317 ShouldNotReachHere(); 4318 return; 4319 } 4320 4321 while (true) { 4322 if (sr_notify(osthread) == 0) { 4323 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { 4324 if (osthread->sr.is_running()) { 4325 return; 4326 } 4327 } 4328 } else { 4329 ShouldNotReachHere(); 4330 } 4331 } 4332 4333 guarantee(osthread->sr.is_running(), "Must be running!"); 4334 } 4335 4336 void os::SuspendedThreadTask::internal_do_task() { 4337 if (do_suspend(_thread->osthread())) { 4338 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); 4339 do_task(context); 4340 do_resume(_thread->osthread()); 4341 } 4342 } 4343 4344 class PcFetcher : public os::SuspendedThreadTask { 4345 public: 4346 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {} 4347 ExtendedPC result(); 4348 protected: 4349 void do_task(const os::SuspendedThreadTaskContext& context); 4350 private: 4351 ExtendedPC _epc; 4352 }; 4353 4354 ExtendedPC PcFetcher::result() { 4355 guarantee(is_done(), "task is not done yet."); 4356 return _epc; 4357 } 4358 4359 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) { 4360 Thread* thread = context.thread(); 4361 OSThread* osthread = thread->osthread(); 4362 if (osthread->ucontext() != NULL) { 4363 _epc = os::Solaris::ucontext_get_pc((ucontext_t *) context.ucontext()); 4364 } else { 4365 // NULL context is unexpected, double-check this is the VMThread 4366 guarantee(thread->is_VM_thread(), "can only be called for VMThread"); 4367 } 4368 } 4369 4370 // A lightweight implementation that does not suspend the target thread and 4371 // thus returns only a hint. Used for profiling only! 4372 ExtendedPC os::get_thread_pc(Thread* thread) { 4373 // Make sure that it is called by the watcher and the Threads lock is owned. 4374 assert(Thread::current()->is_Watcher_thread(), "Must be watcher and own Threads_lock"); 4375 // For now, is only used to profile the VM Thread 4376 assert(thread->is_VM_thread(), "Can only be called for VMThread"); 4377 PcFetcher fetcher(thread); 4378 fetcher.run(); 4379 return fetcher.result(); 4380 } 4381 4382 4383 // This does not do anything on Solaris. This is basically a hook for being 4384 // able to use structured exception handling (thread-local exception filters) on, e.g., Win32. 4385 void os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread) { 4386 f(value, method, args, thread); 4387 } 4388 4389 // This routine may be used by user applications as a "hook" to catch signals. 4390 // The user-defined signal handler must pass unrecognized signals to this 4391 // routine, and if it returns true (non-zero), then the signal handler must 4392 // return immediately. If the flag "abort_if_unrecognized" is true, then this 4393 // routine will never retun false (zero), but instead will execute a VM panic 4394 // routine kill the process. 4395 // 4396 // If this routine returns false, it is OK to call it again. This allows 4397 // the user-defined signal handler to perform checks either before or after 4398 // the VM performs its own checks. Naturally, the user code would be making 4399 // a serious error if it tried to handle an exception (such as a null check 4400 // or breakpoint) that the VM was generating for its own correct operation. 4401 // 4402 // This routine may recognize any of the following kinds of signals: 4403 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ, 4404 // os::Solaris::SIGasync 4405 // It should be consulted by handlers for any of those signals. 4406 // It explicitly does not recognize os::Solaris::SIGinterrupt 4407 // 4408 // The caller of this routine must pass in the three arguments supplied 4409 // to the function referred to in the "sa_sigaction" (not the "sa_handler") 4410 // field of the structure passed to sigaction(). This routine assumes that 4411 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 4412 // 4413 // Note that the VM will print warnings if it detects conflicting signal 4414 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 4415 // 4416 extern "C" JNIEXPORT int 4417 JVM_handle_solaris_signal(int signo, siginfo_t* siginfo, void* ucontext, 4418 int abort_if_unrecognized); 4419 4420 4421 void signalHandler(int sig, siginfo_t* info, void* ucVoid) { 4422 int orig_errno = errno; // Preserve errno value over signal handler. 4423 JVM_handle_solaris_signal(sig, info, ucVoid, true); 4424 errno = orig_errno; 4425 } 4426 4427 /* Do not delete - if guarantee is ever removed, a signal handler (even empty) 4428 is needed to provoke threads blocked on IO to return an EINTR 4429 Note: this explicitly does NOT call JVM_handle_solaris_signal and 4430 does NOT participate in signal chaining due to requirement for 4431 NOT setting SA_RESTART to make EINTR work. */ 4432 extern "C" void sigINTRHandler(int sig, siginfo_t* info, void* ucVoid) { 4433 if (UseSignalChaining) { 4434 struct sigaction *actp = os::Solaris::get_chained_signal_action(sig); 4435 if (actp && actp->sa_handler) { 4436 vm_exit_during_initialization("Signal chaining detected for VM interrupt signal, try -XX:+UseAltSigs"); 4437 } 4438 } 4439 } 4440 4441 // This boolean allows users to forward their own non-matching signals 4442 // to JVM_handle_solaris_signal, harmlessly. 4443 bool os::Solaris::signal_handlers_are_installed = false; 4444 4445 // For signal-chaining 4446 bool os::Solaris::libjsig_is_loaded = false; 4447 typedef struct sigaction *(*get_signal_t)(int); 4448 get_signal_t os::Solaris::get_signal_action = NULL; 4449 4450 struct sigaction* os::Solaris::get_chained_signal_action(int sig) { 4451 struct sigaction *actp = NULL; 4452 4453 if ((libjsig_is_loaded) && (sig <= Maxlibjsigsigs)) { 4454 // Retrieve the old signal handler from libjsig 4455 actp = (*get_signal_action)(sig); 4456 } 4457 if (actp == NULL) { 4458 // Retrieve the preinstalled signal handler from jvm 4459 actp = get_preinstalled_handler(sig); 4460 } 4461 4462 return actp; 4463 } 4464 4465 static bool call_chained_handler(struct sigaction *actp, int sig, 4466 siginfo_t *siginfo, void *context) { 4467 // Call the old signal handler 4468 if (actp->sa_handler == SIG_DFL) { 4469 // It's more reasonable to let jvm treat it as an unexpected exception 4470 // instead of taking the default action. 4471 return false; 4472 } else if (actp->sa_handler != SIG_IGN) { 4473 if ((actp->sa_flags & SA_NODEFER) == 0) { 4474 // automaticlly block the signal 4475 sigaddset(&(actp->sa_mask), sig); 4476 } 4477 4478 sa_handler_t hand; 4479 sa_sigaction_t sa; 4480 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 4481 // retrieve the chained handler 4482 if (siginfo_flag_set) { 4483 sa = actp->sa_sigaction; 4484 } else { 4485 hand = actp->sa_handler; 4486 } 4487 4488 if ((actp->sa_flags & SA_RESETHAND) != 0) { 4489 actp->sa_handler = SIG_DFL; 4490 } 4491 4492 // try to honor the signal mask 4493 sigset_t oset; 4494 thr_sigsetmask(SIG_SETMASK, &(actp->sa_mask), &oset); 4495 4496 // call into the chained handler 4497 if (siginfo_flag_set) { 4498 (*sa)(sig, siginfo, context); 4499 } else { 4500 (*hand)(sig); 4501 } 4502 4503 // restore the signal mask 4504 thr_sigsetmask(SIG_SETMASK, &oset, 0); 4505 } 4506 // Tell jvm's signal handler the signal is taken care of. 4507 return true; 4508 } 4509 4510 bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) { 4511 bool chained = false; 4512 // signal-chaining 4513 if (UseSignalChaining) { 4514 struct sigaction *actp = get_chained_signal_action(sig); 4515 if (actp != NULL) { 4516 chained = call_chained_handler(actp, sig, siginfo, context); 4517 } 4518 } 4519 return chained; 4520 } 4521 4522 struct sigaction* os::Solaris::get_preinstalled_handler(int sig) { 4523 assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized"); 4524 if (preinstalled_sigs[sig] != 0) { 4525 return &chainedsigactions[sig]; 4526 } 4527 return NULL; 4528 } 4529 4530 void os::Solaris::save_preinstalled_handler(int sig, struct sigaction& oldAct) { 4531 4532 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range"); 4533 assert((chainedsigactions != (struct sigaction *)NULL) && (preinstalled_sigs != (int *)NULL) , "signals not yet initialized"); 4534 chainedsigactions[sig] = oldAct; 4535 preinstalled_sigs[sig] = 1; 4536 } 4537 4538 void os::Solaris::set_signal_handler(int sig, bool set_installed, bool oktochain) { 4539 // Check for overwrite. 4540 struct sigaction oldAct; 4541 sigaction(sig, (struct sigaction*)NULL, &oldAct); 4542 void* oldhand = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 4543 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 4544 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 4545 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 4546 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) { 4547 if (AllowUserSignalHandlers || !set_installed) { 4548 // Do not overwrite; user takes responsibility to forward to us. 4549 return; 4550 } else if (UseSignalChaining) { 4551 if (oktochain) { 4552 // save the old handler in jvm 4553 save_preinstalled_handler(sig, oldAct); 4554 } else { 4555 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal, try -XX:+UseAltSigs."); 4556 } 4557 // libjsig also interposes the sigaction() call below and saves the 4558 // old sigaction on it own. 4559 } else { 4560 fatal(err_msg("Encountered unexpected pre-existing sigaction handler " 4561 "%#lx for signal %d.", (long)oldhand, sig)); 4562 } 4563 } 4564 4565 struct sigaction sigAct; 4566 sigfillset(&(sigAct.sa_mask)); 4567 sigAct.sa_handler = SIG_DFL; 4568 4569 sigAct.sa_sigaction = signalHandler; 4570 // Handle SIGSEGV on alternate signal stack if 4571 // not using stack banging 4572 if (!UseStackBanging && sig == SIGSEGV) { 4573 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK; 4574 // Interruptible i/o requires SA_RESTART cleared so EINTR 4575 // is returned instead of restarting system calls 4576 } else if (sig == os::Solaris::SIGinterrupt()) { 4577 sigemptyset(&sigAct.sa_mask); 4578 sigAct.sa_handler = NULL; 4579 sigAct.sa_flags = SA_SIGINFO; 4580 sigAct.sa_sigaction = sigINTRHandler; 4581 } else { 4582 sigAct.sa_flags = SA_SIGINFO | SA_RESTART; 4583 } 4584 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags); 4585 4586 sigaction(sig, &sigAct, &oldAct); 4587 4588 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 4589 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 4590 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 4591 } 4592 4593 4594 #define DO_SIGNAL_CHECK(sig) \ 4595 if (!sigismember(&check_signal_done, sig)) \ 4596 os::Solaris::check_signal_handler(sig) 4597 4598 // This method is a periodic task to check for misbehaving JNI applications 4599 // under CheckJNI, we can add any periodic checks here 4600 4601 void os::run_periodic_checks() { 4602 // A big source of grief is hijacking virt. addr 0x0 on Solaris, 4603 // thereby preventing a NULL checks. 4604 if(!check_addr0_done) check_addr0_done = check_addr0(tty); 4605 4606 if (check_signals == false) return; 4607 4608 // SEGV and BUS if overridden could potentially prevent 4609 // generation of hs*.log in the event of a crash, debugging 4610 // such a case can be very challenging, so we absolutely 4611 // check for the following for a good measure: 4612 DO_SIGNAL_CHECK(SIGSEGV); 4613 DO_SIGNAL_CHECK(SIGILL); 4614 DO_SIGNAL_CHECK(SIGFPE); 4615 DO_SIGNAL_CHECK(SIGBUS); 4616 DO_SIGNAL_CHECK(SIGPIPE); 4617 DO_SIGNAL_CHECK(SIGXFSZ); 4618 4619 // ReduceSignalUsage allows the user to override these handlers 4620 // see comments at the very top and jvm_solaris.h 4621 if (!ReduceSignalUsage) { 4622 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 4623 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 4624 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 4625 DO_SIGNAL_CHECK(BREAK_SIGNAL); 4626 } 4627 4628 // See comments above for using JVM1/JVM2 and UseAltSigs 4629 DO_SIGNAL_CHECK(os::Solaris::SIGinterrupt()); 4630 DO_SIGNAL_CHECK(os::Solaris::SIGasync()); 4631 4632 } 4633 4634 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 4635 4636 static os_sigaction_t os_sigaction = NULL; 4637 4638 void os::Solaris::check_signal_handler(int sig) { 4639 char buf[O_BUFLEN]; 4640 address jvmHandler = NULL; 4641 4642 struct sigaction act; 4643 if (os_sigaction == NULL) { 4644 // only trust the default sigaction, in case it has been interposed 4645 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); 4646 if (os_sigaction == NULL) return; 4647 } 4648 4649 os_sigaction(sig, (struct sigaction*)NULL, &act); 4650 4651 address thisHandler = (act.sa_flags & SA_SIGINFO) 4652 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 4653 : CAST_FROM_FN_PTR(address, act.sa_handler) ; 4654 4655 4656 switch(sig) { 4657 case SIGSEGV: 4658 case SIGBUS: 4659 case SIGFPE: 4660 case SIGPIPE: 4661 case SIGXFSZ: 4662 case SIGILL: 4663 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler); 4664 break; 4665 4666 case SHUTDOWN1_SIGNAL: 4667 case SHUTDOWN2_SIGNAL: 4668 case SHUTDOWN3_SIGNAL: 4669 case BREAK_SIGNAL: 4670 jvmHandler = (address)user_handler(); 4671 break; 4672 4673 default: 4674 int intrsig = os::Solaris::SIGinterrupt(); 4675 int asynsig = os::Solaris::SIGasync(); 4676 4677 if (sig == intrsig) { 4678 jvmHandler = CAST_FROM_FN_PTR(address, sigINTRHandler); 4679 } else if (sig == asynsig) { 4680 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler); 4681 } else { 4682 return; 4683 } 4684 break; 4685 } 4686 4687 4688 if (thisHandler != jvmHandler) { 4689 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 4690 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 4691 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 4692 // No need to check this sig any longer 4693 sigaddset(&check_signal_done, sig); 4694 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) { 4695 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 4696 tty->print("expected:" PTR32_FORMAT, os::Solaris::get_our_sigflags(sig)); 4697 tty->print_cr(" found:" PTR32_FORMAT, act.sa_flags); 4698 // No need to check this sig any longer 4699 sigaddset(&check_signal_done, sig); 4700 } 4701 4702 // Print all the signal handler state 4703 if (sigismember(&check_signal_done, sig)) { 4704 print_signal_handlers(tty, buf, O_BUFLEN); 4705 } 4706 4707 } 4708 4709 void os::Solaris::install_signal_handlers() { 4710 bool libjsigdone = false; 4711 signal_handlers_are_installed = true; 4712 4713 // signal-chaining 4714 typedef void (*signal_setting_t)(); 4715 signal_setting_t begin_signal_setting = NULL; 4716 signal_setting_t end_signal_setting = NULL; 4717 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 4718 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 4719 if (begin_signal_setting != NULL) { 4720 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 4721 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 4722 get_signal_action = CAST_TO_FN_PTR(get_signal_t, 4723 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 4724 get_libjsig_version = CAST_TO_FN_PTR(version_getting_t, 4725 dlsym(RTLD_DEFAULT, "JVM_get_libjsig_version")); 4726 libjsig_is_loaded = true; 4727 if (os::Solaris::get_libjsig_version != NULL) { 4728 libjsigversion = (*os::Solaris::get_libjsig_version)(); 4729 } 4730 assert(UseSignalChaining, "should enable signal-chaining"); 4731 } 4732 if (libjsig_is_loaded) { 4733 // Tell libjsig jvm is setting signal handlers 4734 (*begin_signal_setting)(); 4735 } 4736 4737 set_signal_handler(SIGSEGV, true, true); 4738 set_signal_handler(SIGPIPE, true, true); 4739 set_signal_handler(SIGXFSZ, true, true); 4740 set_signal_handler(SIGBUS, true, true); 4741 set_signal_handler(SIGILL, true, true); 4742 set_signal_handler(SIGFPE, true, true); 4743 4744 4745 if (os::Solaris::SIGinterrupt() > OLDMAXSIGNUM || os::Solaris::SIGasync() > OLDMAXSIGNUM) { 4746 4747 // Pre-1.4.1 Libjsig limited to signal chaining signals <= 32 so 4748 // can not register overridable signals which might be > 32 4749 if (libjsig_is_loaded && libjsigversion <= JSIG_VERSION_1_4_1) { 4750 // Tell libjsig jvm has finished setting signal handlers 4751 (*end_signal_setting)(); 4752 libjsigdone = true; 4753 } 4754 } 4755 4756 // Never ok to chain our SIGinterrupt 4757 set_signal_handler(os::Solaris::SIGinterrupt(), true, false); 4758 set_signal_handler(os::Solaris::SIGasync(), true, true); 4759 4760 if (libjsig_is_loaded && !libjsigdone) { 4761 // Tell libjsig jvm finishes setting signal handlers 4762 (*end_signal_setting)(); 4763 } 4764 4765 // We don't activate signal checker if libjsig is in place, we trust ourselves 4766 // and if UserSignalHandler is installed all bets are off. 4767 // Log that signal checking is off only if -verbose:jni is specified. 4768 if (CheckJNICalls) { 4769 if (libjsig_is_loaded) { 4770 if (PrintJNIResolving) { 4771 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); 4772 } 4773 check_signals = false; 4774 } 4775 if (AllowUserSignalHandlers) { 4776 if (PrintJNIResolving) { 4777 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 4778 } 4779 check_signals = false; 4780 } 4781 } 4782 } 4783 4784 4785 void report_error(const char* file_name, int line_no, const char* title, const char* format, ...); 4786 4787 const char * signames[] = { 4788 "SIG0", 4789 "SIGHUP", "SIGINT", "SIGQUIT", "SIGILL", "SIGTRAP", 4790 "SIGABRT", "SIGEMT", "SIGFPE", "SIGKILL", "SIGBUS", 4791 "SIGSEGV", "SIGSYS", "SIGPIPE", "SIGALRM", "SIGTERM", 4792 "SIGUSR1", "SIGUSR2", "SIGCLD", "SIGPWR", "SIGWINCH", 4793 "SIGURG", "SIGPOLL", "SIGSTOP", "SIGTSTP", "SIGCONT", 4794 "SIGTTIN", "SIGTTOU", "SIGVTALRM", "SIGPROF", "SIGXCPU", 4795 "SIGXFSZ", "SIGWAITING", "SIGLWP", "SIGFREEZE", "SIGTHAW", 4796 "SIGCANCEL", "SIGLOST" 4797 }; 4798 4799 const char* os::exception_name(int exception_code, char* buf, size_t size) { 4800 if (0 < exception_code && exception_code <= SIGRTMAX) { 4801 // signal 4802 if (exception_code < sizeof(signames)/sizeof(const char*)) { 4803 jio_snprintf(buf, size, "%s", signames[exception_code]); 4804 } else { 4805 jio_snprintf(buf, size, "SIG%d", exception_code); 4806 } 4807 return buf; 4808 } else { 4809 return NULL; 4810 } 4811 } 4812 4813 // (Static) wrappers for the new libthread API 4814 int_fnP_thread_t_iP_uP_stack_tP_gregset_t os::Solaris::_thr_getstate; 4815 int_fnP_thread_t_i_gregset_t os::Solaris::_thr_setstate; 4816 int_fnP_thread_t_i os::Solaris::_thr_setmutator; 4817 int_fnP_thread_t os::Solaris::_thr_suspend_mutator; 4818 int_fnP_thread_t os::Solaris::_thr_continue_mutator; 4819 4820 // (Static) wrapper for getisax(2) call. 4821 os::Solaris::getisax_func_t os::Solaris::_getisax = 0; 4822 4823 // (Static) wrappers for the liblgrp API 4824 os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home; 4825 os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init; 4826 os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini; 4827 os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root; 4828 os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children; 4829 os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources; 4830 os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps; 4831 os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale; 4832 os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0; 4833 4834 // (Static) wrapper for meminfo() call. 4835 os::Solaris::meminfo_func_t os::Solaris::_meminfo = 0; 4836 4837 static address resolve_symbol_lazy(const char* name) { 4838 address addr = (address) dlsym(RTLD_DEFAULT, name); 4839 if(addr == NULL) { 4840 // RTLD_DEFAULT was not defined on some early versions of 2.5.1 4841 addr = (address) dlsym(RTLD_NEXT, name); 4842 } 4843 return addr; 4844 } 4845 4846 static address resolve_symbol(const char* name) { 4847 address addr = resolve_symbol_lazy(name); 4848 if(addr == NULL) { 4849 fatal(dlerror()); 4850 } 4851 return addr; 4852 } 4853 4854 4855 4856 // isT2_libthread() 4857 // 4858 // Routine to determine if we are currently using the new T2 libthread. 4859 // 4860 // We determine if we are using T2 by reading /proc/self/lstatus and 4861 // looking for a thread with the ASLWP bit set. If we find this status 4862 // bit set, we must assume that we are NOT using T2. The T2 team 4863 // has approved this algorithm. 4864 // 4865 // We need to determine if we are running with the new T2 libthread 4866 // since setting native thread priorities is handled differently 4867 // when using this library. All threads created using T2 are bound 4868 // threads. Calling thr_setprio is meaningless in this case. 4869 // 4870 bool isT2_libthread() { 4871 static prheader_t * lwpArray = NULL; 4872 static int lwpSize = 0; 4873 static int lwpFile = -1; 4874 lwpstatus_t * that; 4875 char lwpName [128]; 4876 bool isT2 = false; 4877 4878 #define ADR(x) ((uintptr_t)(x)) 4879 #define LWPINDEX(ary,ix) ((lwpstatus_t *)(((ary)->pr_entsize * (ix)) + (ADR((ary) + 1)))) 4880 4881 lwpFile = ::open("/proc/self/lstatus", O_RDONLY, 0); 4882 if (lwpFile < 0) { 4883 if (ThreadPriorityVerbose) warning ("Couldn't open /proc/self/lstatus\n"); 4884 return false; 4885 } 4886 lwpSize = 16*1024; 4887 for (;;) { 4888 ::lseek64 (lwpFile, 0, SEEK_SET); 4889 lwpArray = (prheader_t *)NEW_C_HEAP_ARRAY(char, lwpSize, mtInternal); 4890 if (::read(lwpFile, lwpArray, lwpSize) < 0) { 4891 if (ThreadPriorityVerbose) warning("Error reading /proc/self/lstatus\n"); 4892 break; 4893 } 4894 if ((lwpArray->pr_nent * lwpArray->pr_entsize) <= lwpSize) { 4895 // We got a good snapshot - now iterate over the list. 4896 int aslwpcount = 0; 4897 for (int i = 0; i < lwpArray->pr_nent; i++ ) { 4898 that = LWPINDEX(lwpArray,i); 4899 if (that->pr_flags & PR_ASLWP) { 4900 aslwpcount++; 4901 } 4902 } 4903 if (aslwpcount == 0) isT2 = true; 4904 break; 4905 } 4906 lwpSize = lwpArray->pr_nent * lwpArray->pr_entsize; 4907 FREE_C_HEAP_ARRAY(char, lwpArray, mtInternal); // retry. 4908 } 4909 4910 FREE_C_HEAP_ARRAY(char, lwpArray, mtInternal); 4911 ::close (lwpFile); 4912 if (ThreadPriorityVerbose) { 4913 if (isT2) tty->print_cr("We are running with a T2 libthread\n"); 4914 else tty->print_cr("We are not running with a T2 libthread\n"); 4915 } 4916 return isT2; 4917 } 4918 4919 4920 void os::Solaris::libthread_init() { 4921 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators"); 4922 4923 // Determine if we are running with the new T2 libthread 4924 os::Solaris::set_T2_libthread(isT2_libthread()); 4925 4926 lwp_priocntl_init(); 4927 4928 // RTLD_DEFAULT was not defined on some early versions of 5.5.1 4929 if(func == NULL) { 4930 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators"); 4931 // Guarantee that this VM is running on an new enough OS (5.6 or 4932 // later) that it will have a new enough libthread.so. 4933 guarantee(func != NULL, "libthread.so is too old."); 4934 } 4935 4936 // Initialize the new libthread getstate API wrappers 4937 func = resolve_symbol("thr_getstate"); 4938 os::Solaris::set_thr_getstate(CAST_TO_FN_PTR(int_fnP_thread_t_iP_uP_stack_tP_gregset_t, func)); 4939 4940 func = resolve_symbol("thr_setstate"); 4941 os::Solaris::set_thr_setstate(CAST_TO_FN_PTR(int_fnP_thread_t_i_gregset_t, func)); 4942 4943 func = resolve_symbol("thr_setmutator"); 4944 os::Solaris::set_thr_setmutator(CAST_TO_FN_PTR(int_fnP_thread_t_i, func)); 4945 4946 func = resolve_symbol("thr_suspend_mutator"); 4947 os::Solaris::set_thr_suspend_mutator(CAST_TO_FN_PTR(int_fnP_thread_t, func)); 4948 4949 func = resolve_symbol("thr_continue_mutator"); 4950 os::Solaris::set_thr_continue_mutator(CAST_TO_FN_PTR(int_fnP_thread_t, func)); 4951 4952 int size; 4953 void (*handler_info_func)(address *, int *); 4954 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo")); 4955 handler_info_func(&handler_start, &size); 4956 handler_end = handler_start + size; 4957 } 4958 4959 4960 int_fnP_mutex_tP os::Solaris::_mutex_lock; 4961 int_fnP_mutex_tP os::Solaris::_mutex_trylock; 4962 int_fnP_mutex_tP os::Solaris::_mutex_unlock; 4963 int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init; 4964 int_fnP_mutex_tP os::Solaris::_mutex_destroy; 4965 int os::Solaris::_mutex_scope = USYNC_THREAD; 4966 4967 int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait; 4968 int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait; 4969 int_fnP_cond_tP os::Solaris::_cond_signal; 4970 int_fnP_cond_tP os::Solaris::_cond_broadcast; 4971 int_fnP_cond_tP_i_vP os::Solaris::_cond_init; 4972 int_fnP_cond_tP os::Solaris::_cond_destroy; 4973 int os::Solaris::_cond_scope = USYNC_THREAD; 4974 4975 void os::Solaris::synchronization_init() { 4976 if(UseLWPSynchronization) { 4977 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock"))); 4978 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock"))); 4979 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock"))); 4980 os::Solaris::set_mutex_init(lwp_mutex_init); 4981 os::Solaris::set_mutex_destroy(lwp_mutex_destroy); 4982 os::Solaris::set_mutex_scope(USYNC_THREAD); 4983 4984 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait"))); 4985 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait"))); 4986 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal"))); 4987 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast"))); 4988 os::Solaris::set_cond_init(lwp_cond_init); 4989 os::Solaris::set_cond_destroy(lwp_cond_destroy); 4990 os::Solaris::set_cond_scope(USYNC_THREAD); 4991 } 4992 else { 4993 os::Solaris::set_mutex_scope(USYNC_THREAD); 4994 os::Solaris::set_cond_scope(USYNC_THREAD); 4995 4996 if(UsePthreads) { 4997 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock"))); 4998 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock"))); 4999 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock"))); 5000 os::Solaris::set_mutex_init(pthread_mutex_default_init); 5001 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy"))); 5002 5003 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait"))); 5004 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait"))); 5005 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal"))); 5006 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast"))); 5007 os::Solaris::set_cond_init(pthread_cond_default_init); 5008 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy"))); 5009 } 5010 else { 5011 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock"))); 5012 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock"))); 5013 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock"))); 5014 os::Solaris::set_mutex_init(::mutex_init); 5015 os::Solaris::set_mutex_destroy(::mutex_destroy); 5016 5017 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait"))); 5018 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait"))); 5019 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal"))); 5020 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast"))); 5021 os::Solaris::set_cond_init(::cond_init); 5022 os::Solaris::set_cond_destroy(::cond_destroy); 5023 } 5024 } 5025 } 5026 5027 bool os::Solaris::liblgrp_init() { 5028 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY); 5029 if (handle != NULL) { 5030 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home"))); 5031 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init"))); 5032 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini"))); 5033 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root"))); 5034 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children"))); 5035 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources"))); 5036 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps"))); 5037 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t, 5038 dlsym(handle, "lgrp_cookie_stale"))); 5039 5040 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER); 5041 set_lgrp_cookie(c); 5042 return true; 5043 } 5044 return false; 5045 } 5046 5047 void os::Solaris::misc_sym_init() { 5048 address func; 5049 5050 // getisax 5051 func = resolve_symbol_lazy("getisax"); 5052 if (func != NULL) { 5053 os::Solaris::_getisax = CAST_TO_FN_PTR(getisax_func_t, func); 5054 } 5055 5056 // meminfo 5057 func = resolve_symbol_lazy("meminfo"); 5058 if (func != NULL) { 5059 os::Solaris::set_meminfo(CAST_TO_FN_PTR(meminfo_func_t, func)); 5060 } 5061 } 5062 5063 uint_t os::Solaris::getisax(uint32_t* array, uint_t n) { 5064 assert(_getisax != NULL, "_getisax not set"); 5065 return _getisax(array, n); 5066 } 5067 5068 // int pset_getloadavg(psetid_t pset, double loadavg[], int nelem); 5069 typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem); 5070 static pset_getloadavg_type pset_getloadavg_ptr = NULL; 5071 5072 void init_pset_getloadavg_ptr(void) { 5073 pset_getloadavg_ptr = 5074 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg"); 5075 if (PrintMiscellaneous && Verbose && pset_getloadavg_ptr == NULL) { 5076 warning("pset_getloadavg function not found"); 5077 } 5078 } 5079 5080 int os::Solaris::_dev_zero_fd = -1; 5081 5082 // this is called _before_ the global arguments have been parsed 5083 void os::init(void) { 5084 _initial_pid = getpid(); 5085 5086 max_hrtime = first_hrtime = gethrtime(); 5087 5088 init_random(1234567); 5089 5090 page_size = sysconf(_SC_PAGESIZE); 5091 if (page_size == -1) 5092 fatal(err_msg("os_solaris.cpp: os::init: sysconf failed (%s)", 5093 strerror(errno))); 5094 init_page_sizes((size_t) page_size); 5095 5096 Solaris::initialize_system_info(); 5097 5098 // Initialize misc. symbols as soon as possible, so we can use them 5099 // if we need them. 5100 Solaris::misc_sym_init(); 5101 5102 int fd = ::open("/dev/zero", O_RDWR); 5103 if (fd < 0) { 5104 fatal(err_msg("os::init: cannot open /dev/zero (%s)", strerror(errno))); 5105 } else { 5106 Solaris::set_dev_zero_fd(fd); 5107 5108 // Close on exec, child won't inherit. 5109 fcntl(fd, F_SETFD, FD_CLOEXEC); 5110 } 5111 5112 clock_tics_per_sec = CLK_TCK; 5113 5114 // check if dladdr1() exists; dladdr1 can provide more information than 5115 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9 5116 // and is available on linker patches for 5.7 and 5.8. 5117 // libdl.so must have been loaded, this call is just an entry lookup 5118 void * hdl = dlopen("libdl.so", RTLD_NOW); 5119 if (hdl) 5120 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1")); 5121 5122 // (Solaris only) this switches to calls that actually do locking. 5123 ThreadCritical::initialize(); 5124 5125 main_thread = thr_self(); 5126 5127 // Constant minimum stack size allowed. It must be at least 5128 // the minimum of what the OS supports (thr_min_stack()), and 5129 // enough to allow the thread to get to user bytecode execution. 5130 Solaris::min_stack_allowed = MAX2(thr_min_stack(), Solaris::min_stack_allowed); 5131 // If the pagesize of the VM is greater than 8K determine the appropriate 5132 // number of initial guard pages. The user can change this with the 5133 // command line arguments, if needed. 5134 if (vm_page_size() > 8*K) { 5135 StackYellowPages = 1; 5136 StackRedPages = 1; 5137 StackShadowPages = round_to((StackShadowPages*8*K), vm_page_size()) / vm_page_size(); 5138 } 5139 } 5140 5141 // To install functions for atexit system call 5142 extern "C" { 5143 static void perfMemory_exit_helper() { 5144 perfMemory_exit(); 5145 } 5146 } 5147 5148 // this is called _after_ the global arguments have been parsed 5149 jint os::init_2(void) { 5150 // try to enable extended file IO ASAP, see 6431278 5151 os::Solaris::try_enable_extended_io(); 5152 5153 // Allocate a single page and mark it as readable for safepoint polling. Also 5154 // use this first mmap call to check support for MAP_ALIGN. 5155 address polling_page = (address)Solaris::mmap_chunk((char*)page_size, 5156 page_size, 5157 MAP_PRIVATE | MAP_ALIGN, 5158 PROT_READ); 5159 if (polling_page == NULL) { 5160 has_map_align = false; 5161 polling_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE, 5162 PROT_READ); 5163 } 5164 5165 os::set_polling_page(polling_page); 5166 5167 #ifndef PRODUCT 5168 if( Verbose && PrintMiscellaneous ) 5169 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", (intptr_t)polling_page); 5170 #endif 5171 5172 if (!UseMembar) { 5173 address mem_serialize_page = (address)Solaris::mmap_chunk( NULL, page_size, MAP_PRIVATE, PROT_READ | PROT_WRITE ); 5174 guarantee( mem_serialize_page != NULL, "mmap Failed for memory serialize page"); 5175 os::set_memory_serialize_page( mem_serialize_page ); 5176 5177 #ifndef PRODUCT 5178 if(Verbose && PrintMiscellaneous) 5179 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", (intptr_t)mem_serialize_page); 5180 #endif 5181 } 5182 5183 os::large_page_init(); 5184 5185 // Check minimum allowable stack size for thread creation and to initialize 5186 // the java system classes, including StackOverflowError - depends on page 5187 // size. Add a page for compiler2 recursion in main thread. 5188 // Add in 2*BytesPerWord times page size to account for VM stack during 5189 // class initialization depending on 32 or 64 bit VM. 5190 os::Solaris::min_stack_allowed = MAX2(os::Solaris::min_stack_allowed, 5191 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+ 5192 2*BytesPerWord COMPILER2_PRESENT(+1)) * page_size); 5193 5194 size_t threadStackSizeInBytes = ThreadStackSize * K; 5195 if (threadStackSizeInBytes != 0 && 5196 threadStackSizeInBytes < os::Solaris::min_stack_allowed) { 5197 tty->print_cr("\nThe stack size specified is too small, Specify at least %dk", 5198 os::Solaris::min_stack_allowed/K); 5199 return JNI_ERR; 5200 } 5201 5202 // For 64kbps there will be a 64kb page size, which makes 5203 // the usable default stack size quite a bit less. Increase the 5204 // stack for 64kb (or any > than 8kb) pages, this increases 5205 // virtual memory fragmentation (since we're not creating the 5206 // stack on a power of 2 boundary. The real fix for this 5207 // should be to fix the guard page mechanism. 5208 5209 if (vm_page_size() > 8*K) { 5210 threadStackSizeInBytes = (threadStackSizeInBytes != 0) 5211 ? threadStackSizeInBytes + 5212 ((StackYellowPages + StackRedPages) * vm_page_size()) 5213 : 0; 5214 ThreadStackSize = threadStackSizeInBytes/K; 5215 } 5216 5217 // Make the stack size a multiple of the page size so that 5218 // the yellow/red zones can be guarded. 5219 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, 5220 vm_page_size())); 5221 5222 Solaris::libthread_init(); 5223 5224 if (UseNUMA) { 5225 if (!Solaris::liblgrp_init()) { 5226 UseNUMA = false; 5227 } else { 5228 size_t lgrp_limit = os::numa_get_groups_num(); 5229 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtInternal); 5230 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit); 5231 FREE_C_HEAP_ARRAY(int, lgrp_ids, mtInternal); 5232 if (lgrp_num < 2) { 5233 // There's only one locality group, disable NUMA. 5234 UseNUMA = false; 5235 } 5236 } 5237 if (!UseNUMA && ForceNUMA) { 5238 UseNUMA = true; 5239 } 5240 } 5241 5242 Solaris::signal_sets_init(); 5243 Solaris::init_signal_mem(); 5244 Solaris::install_signal_handlers(); 5245 5246 if (libjsigversion < JSIG_VERSION_1_4_1) { 5247 Maxlibjsigsigs = OLDMAXSIGNUM; 5248 } 5249 5250 // initialize synchronization primitives to use either thread or 5251 // lwp synchronization (controlled by UseLWPSynchronization) 5252 Solaris::synchronization_init(); 5253 5254 if (MaxFDLimit) { 5255 // set the number of file descriptors to max. print out error 5256 // if getrlimit/setrlimit fails but continue regardless. 5257 struct rlimit nbr_files; 5258 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 5259 if (status != 0) { 5260 if (PrintMiscellaneous && (Verbose || WizardMode)) 5261 perror("os::init_2 getrlimit failed"); 5262 } else { 5263 nbr_files.rlim_cur = nbr_files.rlim_max; 5264 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 5265 if (status != 0) { 5266 if (PrintMiscellaneous && (Verbose || WizardMode)) 5267 perror("os::init_2 setrlimit failed"); 5268 } 5269 } 5270 } 5271 5272 // Calculate theoretical max. size of Threads to guard gainst 5273 // artifical out-of-memory situations, where all available address- 5274 // space has been reserved by thread stacks. Default stack size is 1Mb. 5275 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ? 5276 JavaThread::stack_size_at_create() : (1*K*K); 5277 assert(pre_thread_stack_size != 0, "Must have a stack"); 5278 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when 5279 // we should start doing Virtual Memory banging. Currently when the threads will 5280 // have used all but 200Mb of space. 5281 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K); 5282 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size; 5283 5284 // at-exit methods are called in the reverse order of their registration. 5285 // In Solaris 7 and earlier, atexit functions are called on return from 5286 // main or as a result of a call to exit(3C). There can be only 32 of 5287 // these functions registered and atexit() does not set errno. In Solaris 5288 // 8 and later, there is no limit to the number of functions registered 5289 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit 5290 // functions are called upon dlclose(3DL) in addition to return from main 5291 // and exit(3C). 5292 5293 if (PerfAllowAtExitRegistration) { 5294 // only register atexit functions if PerfAllowAtExitRegistration is set. 5295 // atexit functions can be delayed until process exit time, which 5296 // can be problematic for embedded VM situations. Embedded VMs should 5297 // call DestroyJavaVM() to assure that VM resources are released. 5298 5299 // note: perfMemory_exit_helper atexit function may be removed in 5300 // the future if the appropriate cleanup code can be added to the 5301 // VM_Exit VMOperation's doit method. 5302 if (atexit(perfMemory_exit_helper) != 0) { 5303 warning("os::init2 atexit(perfMemory_exit_helper) failed"); 5304 } 5305 } 5306 5307 // Init pset_loadavg function pointer 5308 init_pset_getloadavg_ptr(); 5309 5310 return JNI_OK; 5311 } 5312 5313 void os::init_3(void) { 5314 return; 5315 } 5316 5317 // Mark the polling page as unreadable 5318 void os::make_polling_page_unreadable(void) { 5319 if( mprotect((char *)_polling_page, page_size, PROT_NONE) != 0 ) 5320 fatal("Could not disable polling page"); 5321 }; 5322 5323 // Mark the polling page as readable 5324 void os::make_polling_page_readable(void) { 5325 if( mprotect((char *)_polling_page, page_size, PROT_READ) != 0 ) 5326 fatal("Could not enable polling page"); 5327 }; 5328 5329 // OS interface. 5330 5331 bool os::check_heap(bool force) { return true; } 5332 5333 typedef int (*vsnprintf_t)(char* buf, size_t count, const char* fmt, va_list argptr); 5334 static vsnprintf_t sol_vsnprintf = NULL; 5335 5336 int local_vsnprintf(char* buf, size_t count, const char* fmt, va_list argptr) { 5337 if (!sol_vsnprintf) { 5338 //search for the named symbol in the objects that were loaded after libjvm 5339 void* where = RTLD_NEXT; 5340 if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL) 5341 sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf")); 5342 if (!sol_vsnprintf){ 5343 //search for the named symbol in the objects that were loaded before libjvm 5344 where = RTLD_DEFAULT; 5345 if ((sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "__vsnprintf"))) == NULL) 5346 sol_vsnprintf = CAST_TO_FN_PTR(vsnprintf_t, dlsym(where, "vsnprintf")); 5347 assert(sol_vsnprintf != NULL, "vsnprintf not found"); 5348 } 5349 } 5350 return (*sol_vsnprintf)(buf, count, fmt, argptr); 5351 } 5352 5353 5354 // Is a (classpath) directory empty? 5355 bool os::dir_is_empty(const char* path) { 5356 DIR *dir = NULL; 5357 struct dirent *ptr; 5358 5359 dir = opendir(path); 5360 if (dir == NULL) return true; 5361 5362 /* Scan the directory */ 5363 bool result = true; 5364 char buf[sizeof(struct dirent) + MAX_PATH]; 5365 struct dirent *dbuf = (struct dirent *) buf; 5366 while (result && (ptr = readdir(dir, dbuf)) != NULL) { 5367 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 5368 result = false; 5369 } 5370 } 5371 closedir(dir); 5372 return result; 5373 } 5374 5375 // This code originates from JDK's sysOpen and open64_w 5376 // from src/solaris/hpi/src/system_md.c 5377 5378 #ifndef O_DELETE 5379 #define O_DELETE 0x10000 5380 #endif 5381 5382 // Open a file. Unlink the file immediately after open returns 5383 // if the specified oflag has the O_DELETE flag set. 5384 // O_DELETE is used only in j2se/src/share/native/java/util/zip/ZipFile.c 5385 5386 int os::open(const char *path, int oflag, int mode) { 5387 if (strlen(path) > MAX_PATH - 1) { 5388 errno = ENAMETOOLONG; 5389 return -1; 5390 } 5391 int fd; 5392 int o_delete = (oflag & O_DELETE); 5393 oflag = oflag & ~O_DELETE; 5394 5395 fd = ::open64(path, oflag, mode); 5396 if (fd == -1) return -1; 5397 5398 //If the open succeeded, the file might still be a directory 5399 { 5400 struct stat64 buf64; 5401 int ret = ::fstat64(fd, &buf64); 5402 int st_mode = buf64.st_mode; 5403 5404 if (ret != -1) { 5405 if ((st_mode & S_IFMT) == S_IFDIR) { 5406 errno = EISDIR; 5407 ::close(fd); 5408 return -1; 5409 } 5410 } else { 5411 ::close(fd); 5412 return -1; 5413 } 5414 } 5415 /* 5416 * 32-bit Solaris systems suffer from: 5417 * 5418 * - an historical default soft limit of 256 per-process file 5419 * descriptors that is too low for many Java programs. 5420 * 5421 * - a design flaw where file descriptors created using stdio 5422 * fopen must be less than 256, _even_ when the first limit above 5423 * has been raised. This can cause calls to fopen (but not calls to 5424 * open, for example) to fail mysteriously, perhaps in 3rd party 5425 * native code (although the JDK itself uses fopen). One can hardly 5426 * criticize them for using this most standard of all functions. 5427 * 5428 * We attempt to make everything work anyways by: 5429 * 5430 * - raising the soft limit on per-process file descriptors beyond 5431 * 256 5432 * 5433 * - As of Solaris 10u4, we can request that Solaris raise the 256 5434 * stdio fopen limit by calling function enable_extended_FILE_stdio. 5435 * This is done in init_2 and recorded in enabled_extended_FILE_stdio 5436 * 5437 * - If we are stuck on an old (pre 10u4) Solaris system, we can 5438 * workaround the bug by remapping non-stdio file descriptors below 5439 * 256 to ones beyond 256, which is done below. 5440 * 5441 * See: 5442 * 1085341: 32-bit stdio routines should support file descriptors >255 5443 * 6533291: Work around 32-bit Solaris stdio limit of 256 open files 5444 * 6431278: Netbeans crash on 32 bit Solaris: need to call 5445 * enable_extended_FILE_stdio() in VM initialisation 5446 * Giri Mandalika's blog 5447 * http://technopark02.blogspot.com/2005_05_01_archive.html 5448 */ 5449 #ifndef _LP64 5450 if ((!enabled_extended_FILE_stdio) && fd < 256) { 5451 int newfd = ::fcntl(fd, F_DUPFD, 256); 5452 if (newfd != -1) { 5453 ::close(fd); 5454 fd = newfd; 5455 } 5456 } 5457 #endif // 32-bit Solaris 5458 /* 5459 * All file descriptors that are opened in the JVM and not 5460 * specifically destined for a subprocess should have the 5461 * close-on-exec flag set. If we don't set it, then careless 3rd 5462 * party native code might fork and exec without closing all 5463 * appropriate file descriptors (e.g. as we do in closeDescriptors in 5464 * UNIXProcess.c), and this in turn might: 5465 * 5466 * - cause end-of-file to fail to be detected on some file 5467 * descriptors, resulting in mysterious hangs, or 5468 * 5469 * - might cause an fopen in the subprocess to fail on a system 5470 * suffering from bug 1085341. 5471 * 5472 * (Yes, the default setting of the close-on-exec flag is a Unix 5473 * design flaw) 5474 * 5475 * See: 5476 * 1085341: 32-bit stdio routines should support file descriptors >255 5477 * 4843136: (process) pipe file descriptor from Runtime.exec not being closed 5478 * 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 5479 */ 5480 #ifdef FD_CLOEXEC 5481 { 5482 int flags = ::fcntl(fd, F_GETFD); 5483 if (flags != -1) 5484 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); 5485 } 5486 #endif 5487 5488 if (o_delete != 0) { 5489 ::unlink(path); 5490 } 5491 return fd; 5492 } 5493 5494 // create binary file, rewriting existing file if required 5495 int os::create_binary_file(const char* path, bool rewrite_existing) { 5496 int oflags = O_WRONLY | O_CREAT; 5497 if (!rewrite_existing) { 5498 oflags |= O_EXCL; 5499 } 5500 return ::open64(path, oflags, S_IREAD | S_IWRITE); 5501 } 5502 5503 // return current position of file pointer 5504 jlong os::current_file_offset(int fd) { 5505 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR); 5506 } 5507 5508 // move file pointer to the specified offset 5509 jlong os::seek_to_file_offset(int fd, jlong offset) { 5510 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET); 5511 } 5512 5513 jlong os::lseek(int fd, jlong offset, int whence) { 5514 return (jlong) ::lseek64(fd, offset, whence); 5515 } 5516 5517 char * os::native_path(char *path) { 5518 return path; 5519 } 5520 5521 int os::ftruncate(int fd, jlong length) { 5522 return ::ftruncate64(fd, length); 5523 } 5524 5525 int os::fsync(int fd) { 5526 RESTARTABLE_RETURN_INT(::fsync(fd)); 5527 } 5528 5529 int os::available(int fd, jlong *bytes) { 5530 jlong cur, end; 5531 int mode; 5532 struct stat64 buf64; 5533 5534 if (::fstat64(fd, &buf64) >= 0) { 5535 mode = buf64.st_mode; 5536 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 5537 /* 5538 * XXX: is the following call interruptible? If so, this might 5539 * need to go through the INTERRUPT_IO() wrapper as for other 5540 * blocking, interruptible calls in this file. 5541 */ 5542 int n,ioctl_return; 5543 5544 INTERRUPTIBLE(::ioctl(fd, FIONREAD, &n),ioctl_return,os::Solaris::clear_interrupted); 5545 if (ioctl_return>= 0) { 5546 *bytes = n; 5547 return 1; 5548 } 5549 } 5550 } 5551 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) { 5552 return 0; 5553 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) { 5554 return 0; 5555 } else if (::lseek64(fd, cur, SEEK_SET) == -1) { 5556 return 0; 5557 } 5558 *bytes = end - cur; 5559 return 1; 5560 } 5561 5562 // Map a block of memory. 5563 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 5564 char *addr, size_t bytes, bool read_only, 5565 bool allow_exec) { 5566 int prot; 5567 int flags; 5568 5569 if (read_only) { 5570 prot = PROT_READ; 5571 flags = MAP_SHARED; 5572 } else { 5573 prot = PROT_READ | PROT_WRITE; 5574 flags = MAP_PRIVATE; 5575 } 5576 5577 if (allow_exec) { 5578 prot |= PROT_EXEC; 5579 } 5580 5581 if (addr != NULL) { 5582 flags |= MAP_FIXED; 5583 } 5584 5585 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, 5586 fd, file_offset); 5587 if (mapped_address == MAP_FAILED) { 5588 return NULL; 5589 } 5590 return mapped_address; 5591 } 5592 5593 5594 // Remap a block of memory. 5595 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 5596 char *addr, size_t bytes, bool read_only, 5597 bool allow_exec) { 5598 // same as map_memory() on this OS 5599 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 5600 allow_exec); 5601 } 5602 5603 5604 // Unmap a block of memory. 5605 bool os::pd_unmap_memory(char* addr, size_t bytes) { 5606 return munmap(addr, bytes) == 0; 5607 } 5608 5609 void os::pause() { 5610 char filename[MAX_PATH]; 5611 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 5612 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 5613 } else { 5614 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 5615 } 5616 5617 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 5618 if (fd != -1) { 5619 struct stat buf; 5620 ::close(fd); 5621 while (::stat(filename, &buf) == 0) { 5622 (void)::poll(NULL, 0, 100); 5623 } 5624 } else { 5625 jio_fprintf(stderr, 5626 "Could not open pause file '%s', continuing immediately.\n", filename); 5627 } 5628 } 5629 5630 #ifndef PRODUCT 5631 #ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS 5632 // Turn this on if you need to trace synch operations. 5633 // Set RECORD_SYNCH_LIMIT to a large-enough value, 5634 // and call record_synch_enable and record_synch_disable 5635 // around the computation of interest. 5636 5637 void record_synch(char* name, bool returning); // defined below 5638 5639 class RecordSynch { 5640 char* _name; 5641 public: 5642 RecordSynch(char* name) :_name(name) 5643 { record_synch(_name, false); } 5644 ~RecordSynch() { record_synch(_name, true); } 5645 }; 5646 5647 #define CHECK_SYNCH_OP(ret, name, params, args, inner) \ 5648 extern "C" ret name params { \ 5649 typedef ret name##_t params; \ 5650 static name##_t* implem = NULL; \ 5651 static int callcount = 0; \ 5652 if (implem == NULL) { \ 5653 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \ 5654 if (implem == NULL) fatal(dlerror()); \ 5655 } \ 5656 ++callcount; \ 5657 RecordSynch _rs(#name); \ 5658 inner; \ 5659 return implem args; \ 5660 } 5661 // in dbx, examine callcounts this way: 5662 // for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done 5663 5664 #define CHECK_POINTER_OK(p) \ 5665 (!Universe::is_fully_initialized() || !Universe::is_reserved_heap((oop)(p))) 5666 #define CHECK_MU \ 5667 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only."); 5668 #define CHECK_CV \ 5669 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only."); 5670 #define CHECK_P(p) \ 5671 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only."); 5672 5673 #define CHECK_MUTEX(mutex_op) \ 5674 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU); 5675 5676 CHECK_MUTEX( mutex_lock) 5677 CHECK_MUTEX( _mutex_lock) 5678 CHECK_MUTEX( mutex_unlock) 5679 CHECK_MUTEX(_mutex_unlock) 5680 CHECK_MUTEX( mutex_trylock) 5681 CHECK_MUTEX(_mutex_trylock) 5682 5683 #define CHECK_COND(cond_op) \ 5684 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU;CHECK_CV); 5685 5686 CHECK_COND( cond_wait); 5687 CHECK_COND(_cond_wait); 5688 CHECK_COND(_cond_wait_cancel); 5689 5690 #define CHECK_COND2(cond_op) \ 5691 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU;CHECK_CV); 5692 5693 CHECK_COND2( cond_timedwait); 5694 CHECK_COND2(_cond_timedwait); 5695 CHECK_COND2(_cond_timedwait_cancel); 5696 5697 // do the _lwp_* versions too 5698 #define mutex_t lwp_mutex_t 5699 #define cond_t lwp_cond_t 5700 CHECK_MUTEX( _lwp_mutex_lock) 5701 CHECK_MUTEX( _lwp_mutex_unlock) 5702 CHECK_MUTEX( _lwp_mutex_trylock) 5703 CHECK_MUTEX( __lwp_mutex_lock) 5704 CHECK_MUTEX( __lwp_mutex_unlock) 5705 CHECK_MUTEX( __lwp_mutex_trylock) 5706 CHECK_MUTEX(___lwp_mutex_lock) 5707 CHECK_MUTEX(___lwp_mutex_unlock) 5708 5709 CHECK_COND( _lwp_cond_wait); 5710 CHECK_COND( __lwp_cond_wait); 5711 CHECK_COND(___lwp_cond_wait); 5712 5713 CHECK_COND2( _lwp_cond_timedwait); 5714 CHECK_COND2( __lwp_cond_timedwait); 5715 #undef mutex_t 5716 #undef cond_t 5717 5718 CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0); 5719 CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0); 5720 CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0); 5721 CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0); 5722 CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p)); 5723 CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p)); 5724 CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV); 5725 CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV); 5726 5727 5728 // recording machinery: 5729 5730 enum { RECORD_SYNCH_LIMIT = 200 }; 5731 char* record_synch_name[RECORD_SYNCH_LIMIT]; 5732 void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT]; 5733 bool record_synch_returning[RECORD_SYNCH_LIMIT]; 5734 thread_t record_synch_thread[RECORD_SYNCH_LIMIT]; 5735 int record_synch_count = 0; 5736 bool record_synch_enabled = false; 5737 5738 // in dbx, examine recorded data this way: 5739 // for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done 5740 5741 void record_synch(char* name, bool returning) { 5742 if (record_synch_enabled) { 5743 if (record_synch_count < RECORD_SYNCH_LIMIT) { 5744 record_synch_name[record_synch_count] = name; 5745 record_synch_returning[record_synch_count] = returning; 5746 record_synch_thread[record_synch_count] = thr_self(); 5747 record_synch_arg0ptr[record_synch_count] = &name; 5748 record_synch_count++; 5749 } 5750 // put more checking code here: 5751 // ... 5752 } 5753 } 5754 5755 void record_synch_enable() { 5756 // start collecting trace data, if not already doing so 5757 if (!record_synch_enabled) record_synch_count = 0; 5758 record_synch_enabled = true; 5759 } 5760 5761 void record_synch_disable() { 5762 // stop collecting trace data 5763 record_synch_enabled = false; 5764 } 5765 5766 #endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS 5767 #endif // PRODUCT 5768 5769 const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime); 5770 const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) - 5771 (intptr_t)(&((prusage_t *)(NULL))->pr_utime); 5772 5773 5774 // JVMTI & JVM monitoring and management support 5775 // The thread_cpu_time() and current_thread_cpu_time() are only 5776 // supported if is_thread_cpu_time_supported() returns true. 5777 // They are not supported on Solaris T1. 5778 5779 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 5780 // are used by JVM M&M and JVMTI to get user+sys or user CPU time 5781 // of a thread. 5782 // 5783 // current_thread_cpu_time() and thread_cpu_time(Thread *) 5784 // returns the fast estimate available on the platform. 5785 5786 // hrtime_t gethrvtime() return value includes 5787 // user time but does not include system time 5788 jlong os::current_thread_cpu_time() { 5789 return (jlong) gethrvtime(); 5790 } 5791 5792 jlong os::thread_cpu_time(Thread *thread) { 5793 // return user level CPU time only to be consistent with 5794 // what current_thread_cpu_time returns. 5795 // thread_cpu_time_info() must be changed if this changes 5796 return os::thread_cpu_time(thread, false /* user time only */); 5797 } 5798 5799 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 5800 if (user_sys_cpu_time) { 5801 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 5802 } else { 5803 return os::current_thread_cpu_time(); 5804 } 5805 } 5806 5807 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 5808 char proc_name[64]; 5809 int count; 5810 prusage_t prusage; 5811 jlong lwp_time; 5812 int fd; 5813 5814 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage", 5815 getpid(), 5816 thread->osthread()->lwp_id()); 5817 fd = ::open(proc_name, O_RDONLY); 5818 if ( fd == -1 ) return -1; 5819 5820 do { 5821 count = ::pread(fd, 5822 (void *)&prusage.pr_utime, 5823 thr_time_size, 5824 thr_time_off); 5825 } while (count < 0 && errno == EINTR); 5826 ::close(fd); 5827 if ( count < 0 ) return -1; 5828 5829 if (user_sys_cpu_time) { 5830 // user + system CPU time 5831 lwp_time = (((jlong)prusage.pr_stime.tv_sec + 5832 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) + 5833 (jlong)prusage.pr_stime.tv_nsec + 5834 (jlong)prusage.pr_utime.tv_nsec; 5835 } else { 5836 // user level CPU time only 5837 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) + 5838 (jlong)prusage.pr_utime.tv_nsec; 5839 } 5840 5841 return(lwp_time); 5842 } 5843 5844 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 5845 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 5846 info_ptr->may_skip_backward = false; // elapsed time not wall time 5847 info_ptr->may_skip_forward = false; // elapsed time not wall time 5848 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned 5849 } 5850 5851 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 5852 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 5853 info_ptr->may_skip_backward = false; // elapsed time not wall time 5854 info_ptr->may_skip_forward = false; // elapsed time not wall time 5855 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned 5856 } 5857 5858 bool os::is_thread_cpu_time_supported() { 5859 if ( os::Solaris::T2_libthread() || UseBoundThreads ) { 5860 return true; 5861 } else { 5862 return false; 5863 } 5864 } 5865 5866 // System loadavg support. Returns -1 if load average cannot be obtained. 5867 // Return the load average for our processor set if the primitive exists 5868 // (Solaris 9 and later). Otherwise just return system wide loadavg. 5869 int os::loadavg(double loadavg[], int nelem) { 5870 if (pset_getloadavg_ptr != NULL) { 5871 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem); 5872 } else { 5873 return ::getloadavg(loadavg, nelem); 5874 } 5875 } 5876 5877 //--------------------------------------------------------------------------------- 5878 5879 bool os::find(address addr, outputStream* st) { 5880 Dl_info dlinfo; 5881 memset(&dlinfo, 0, sizeof(dlinfo)); 5882 if (dladdr(addr, &dlinfo) != 0) { 5883 st->print(PTR_FORMAT ": ", addr); 5884 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) { 5885 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr); 5886 } else if (dlinfo.dli_fbase != NULL) 5887 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase); 5888 else 5889 st->print("<absolute address>"); 5890 if (dlinfo.dli_fname != NULL) { 5891 st->print(" in %s", dlinfo.dli_fname); 5892 } 5893 if (dlinfo.dli_fbase != NULL) { 5894 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); 5895 } 5896 st->cr(); 5897 5898 if (Verbose) { 5899 // decode some bytes around the PC 5900 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size()); 5901 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); 5902 address lowest = (address) dlinfo.dli_sname; 5903 if (!lowest) lowest = (address) dlinfo.dli_fbase; 5904 if (begin < lowest) begin = lowest; 5905 Dl_info dlinfo2; 5906 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr 5907 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) 5908 end = (address) dlinfo2.dli_saddr; 5909 Disassembler::decode(begin, end, st); 5910 } 5911 return true; 5912 } 5913 return false; 5914 } 5915 5916 // Following function has been added to support HotSparc's libjvm.so running 5917 // under Solaris production JDK 1.2.2 / 1.3.0. These came from 5918 // src/solaris/hpi/native_threads in the EVM codebase. 5919 // 5920 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release 5921 // libraries and should thus be removed. We will leave it behind for a while 5922 // until we no longer want to able to run on top of 1.3.0 Solaris production 5923 // JDK. See 4341971. 5924 5925 #define STACK_SLACK 0x800 5926 5927 extern "C" { 5928 intptr_t sysThreadAvailableStackWithSlack() { 5929 stack_t st; 5930 intptr_t retval, stack_top; 5931 retval = thr_stksegment(&st); 5932 assert(retval == 0, "incorrect return value from thr_stksegment"); 5933 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned"); 5934 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned"); 5935 stack_top=(intptr_t)st.ss_sp-st.ss_size; 5936 return ((intptr_t)&stack_top - stack_top - STACK_SLACK); 5937 } 5938 } 5939 5940 // ObjectMonitor park-unpark infrastructure ... 5941 // 5942 // We implement Solaris and Linux PlatformEvents with the 5943 // obvious condvar-mutex-flag triple. 5944 // Another alternative that works quite well is pipes: 5945 // Each PlatformEvent consists of a pipe-pair. 5946 // The thread associated with the PlatformEvent 5947 // calls park(), which reads from the input end of the pipe. 5948 // Unpark() writes into the other end of the pipe. 5949 // The write-side of the pipe must be set NDELAY. 5950 // Unfortunately pipes consume a large # of handles. 5951 // Native solaris lwp_park() and lwp_unpark() work nicely, too. 5952 // Using pipes for the 1st few threads might be workable, however. 5953 // 5954 // park() is permitted to return spuriously. 5955 // Callers of park() should wrap the call to park() in 5956 // an appropriate loop. A litmus test for the correct 5957 // usage of park is the following: if park() were modified 5958 // to immediately return 0 your code should still work, 5959 // albeit degenerating to a spin loop. 5960 // 5961 // An interesting optimization for park() is to use a trylock() 5962 // to attempt to acquire the mutex. If the trylock() fails 5963 // then we know that a concurrent unpark() operation is in-progress. 5964 // in that case the park() code could simply set _count to 0 5965 // and return immediately. The subsequent park() operation *might* 5966 // return immediately. That's harmless as the caller of park() is 5967 // expected to loop. By using trylock() we will have avoided a 5968 // avoided a context switch caused by contention on the per-thread mutex. 5969 // 5970 // TODO-FIXME: 5971 // 1. Reconcile Doug's JSR166 j.u.c park-unpark with the 5972 // objectmonitor implementation. 5973 // 2. Collapse the JSR166 parker event, and the 5974 // objectmonitor ParkEvent into a single "Event" construct. 5975 // 3. In park() and unpark() add: 5976 // assert (Thread::current() == AssociatedWith). 5977 // 4. add spurious wakeup injection on a -XX:EarlyParkReturn=N switch. 5978 // 1-out-of-N park() operations will return immediately. 5979 // 5980 // _Event transitions in park() 5981 // -1 => -1 : illegal 5982 // 1 => 0 : pass - return immediately 5983 // 0 => -1 : block 5984 // 5985 // _Event serves as a restricted-range semaphore. 5986 // 5987 // Another possible encoding of _Event would be with 5988 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits. 5989 // 5990 // TODO-FIXME: add DTRACE probes for: 5991 // 1. Tx parks 5992 // 2. Ty unparks Tx 5993 // 3. Tx resumes from park 5994 5995 5996 // value determined through experimentation 5997 #define ROUNDINGFIX 11 5998 5999 // utility to compute the abstime argument to timedwait. 6000 // TODO-FIXME: switch from compute_abstime() to unpackTime(). 6001 6002 static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) { 6003 // millis is the relative timeout time 6004 // abstime will be the absolute timeout time 6005 if (millis < 0) millis = 0; 6006 struct timeval now; 6007 int status = gettimeofday(&now, NULL); 6008 assert(status == 0, "gettimeofday"); 6009 jlong seconds = millis / 1000; 6010 jlong max_wait_period; 6011 6012 if (UseLWPSynchronization) { 6013 // forward port of fix for 4275818 (not sleeping long enough) 6014 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where 6015 // _lwp_cond_timedwait() used a round_down algorithm rather 6016 // than a round_up. For millis less than our roundfactor 6017 // it rounded down to 0 which doesn't meet the spec. 6018 // For millis > roundfactor we may return a bit sooner, but 6019 // since we can not accurately identify the patch level and 6020 // this has already been fixed in Solaris 9 and 8 we will 6021 // leave it alone rather than always rounding down. 6022 6023 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX; 6024 // It appears that when we go directly through Solaris _lwp_cond_timedwait() 6025 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6 6026 max_wait_period = 21000000; 6027 } else { 6028 max_wait_period = 50000000; 6029 } 6030 millis %= 1000; 6031 if (seconds > max_wait_period) { // see man cond_timedwait(3T) 6032 seconds = max_wait_period; 6033 } 6034 abstime->tv_sec = now.tv_sec + seconds; 6035 long usec = now.tv_usec + millis * 1000; 6036 if (usec >= 1000000) { 6037 abstime->tv_sec += 1; 6038 usec -= 1000000; 6039 } 6040 abstime->tv_nsec = usec * 1000; 6041 return abstime; 6042 } 6043 6044 // Test-and-clear _Event, always leaves _Event set to 0, returns immediately. 6045 // Conceptually TryPark() should be equivalent to park(0). 6046 6047 int os::PlatformEvent::TryPark() { 6048 for (;;) { 6049 const int v = _Event ; 6050 guarantee ((v == 0) || (v == 1), "invariant") ; 6051 if (Atomic::cmpxchg (0, &_Event, v) == v) return v ; 6052 } 6053 } 6054 6055 void os::PlatformEvent::park() { // AKA: down() 6056 // Invariant: Only the thread associated with the Event/PlatformEvent 6057 // may call park(). 6058 int v ; 6059 for (;;) { 6060 v = _Event ; 6061 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 6062 } 6063 guarantee (v >= 0, "invariant") ; 6064 if (v == 0) { 6065 // Do this the hard way by blocking ... 6066 // See http://monaco.sfbay/detail.jsf?cr=5094058. 6067 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking. 6068 // Only for SPARC >= V8PlusA 6069 #if defined(__sparc) && defined(COMPILER2) 6070 if (ClearFPUAtPark) { _mark_fpu_nosave() ; } 6071 #endif 6072 int status = os::Solaris::mutex_lock(_mutex); 6073 assert_status(status == 0, status, "mutex_lock"); 6074 guarantee (_nParked == 0, "invariant") ; 6075 ++ _nParked ; 6076 while (_Event < 0) { 6077 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... 6078 // Treat this the same as if the wait was interrupted 6079 // With usr/lib/lwp going to kernel, always handle ETIME 6080 status = os::Solaris::cond_wait(_cond, _mutex); 6081 if (status == ETIME) status = EINTR ; 6082 assert_status(status == 0 || status == EINTR, status, "cond_wait"); 6083 } 6084 -- _nParked ; 6085 _Event = 0 ; 6086 status = os::Solaris::mutex_unlock(_mutex); 6087 assert_status(status == 0, status, "mutex_unlock"); 6088 // Paranoia to ensure our locked and lock-free paths interact 6089 // correctly with each other. 6090 OrderAccess::fence(); 6091 } 6092 } 6093 6094 int os::PlatformEvent::park(jlong millis) { 6095 guarantee (_nParked == 0, "invariant") ; 6096 int v ; 6097 for (;;) { 6098 v = _Event ; 6099 if (Atomic::cmpxchg (v-1, &_Event, v) == v) break ; 6100 } 6101 guarantee (v >= 0, "invariant") ; 6102 if (v != 0) return OS_OK ; 6103 6104 int ret = OS_TIMEOUT; 6105 timestruc_t abst; 6106 compute_abstime (&abst, millis); 6107 6108 // See http://monaco.sfbay/detail.jsf?cr=5094058. 6109 // For Solaris SPARC set fprs.FEF=0 prior to parking. 6110 // Only for SPARC >= V8PlusA 6111 #if defined(__sparc) && defined(COMPILER2) 6112 if (ClearFPUAtPark) { _mark_fpu_nosave() ; } 6113 #endif 6114 int status = os::Solaris::mutex_lock(_mutex); 6115 assert_status(status == 0, status, "mutex_lock"); 6116 guarantee (_nParked == 0, "invariant") ; 6117 ++ _nParked ; 6118 while (_Event < 0) { 6119 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst); 6120 assert_status(status == 0 || status == EINTR || 6121 status == ETIME || status == ETIMEDOUT, 6122 status, "cond_timedwait"); 6123 if (!FilterSpuriousWakeups) break ; // previous semantics 6124 if (status == ETIME || status == ETIMEDOUT) break ; 6125 // We consume and ignore EINTR and spurious wakeups. 6126 } 6127 -- _nParked ; 6128 if (_Event >= 0) ret = OS_OK ; 6129 _Event = 0 ; 6130 status = os::Solaris::mutex_unlock(_mutex); 6131 assert_status(status == 0, status, "mutex_unlock"); 6132 // Paranoia to ensure our locked and lock-free paths interact 6133 // correctly with each other. 6134 OrderAccess::fence(); 6135 return ret; 6136 } 6137 6138 void os::PlatformEvent::unpark() { 6139 // Transitions for _Event: 6140 // 0 :=> 1 6141 // 1 :=> 1 6142 // -1 :=> either 0 or 1; must signal target thread 6143 // That is, we can safely transition _Event from -1 to either 6144 // 0 or 1. Forcing 1 is slightly more efficient for back-to-back 6145 // unpark() calls. 6146 // See also: "Semaphores in Plan 9" by Mullender & Cox 6147 // 6148 // Note: Forcing a transition from "-1" to "1" on an unpark() means 6149 // that it will take two back-to-back park() calls for the owning 6150 // thread to block. This has the benefit of forcing a spurious return 6151 // from the first park() call after an unpark() call which will help 6152 // shake out uses of park() and unpark() without condition variables. 6153 6154 if (Atomic::xchg(1, &_Event) >= 0) return; 6155 6156 // If the thread associated with the event was parked, wake it. 6157 // Wait for the thread assoc with the PlatformEvent to vacate. 6158 int status = os::Solaris::mutex_lock(_mutex); 6159 assert_status(status == 0, status, "mutex_lock"); 6160 int AnyWaiters = _nParked; 6161 status = os::Solaris::mutex_unlock(_mutex); 6162 assert_status(status == 0, status, "mutex_unlock"); 6163 guarantee(AnyWaiters == 0 || AnyWaiters == 1, "invariant"); 6164 if (AnyWaiters != 0) { 6165 // We intentional signal *after* dropping the lock 6166 // to avoid a common class of futile wakeups. 6167 status = os::Solaris::cond_signal(_cond); 6168 assert_status(status == 0, status, "cond_signal"); 6169 } 6170 } 6171 6172 // JSR166 6173 // ------------------------------------------------------- 6174 6175 /* 6176 * The solaris and linux implementations of park/unpark are fairly 6177 * conservative for now, but can be improved. They currently use a 6178 * mutex/condvar pair, plus _counter. 6179 * Park decrements _counter if > 0, else does a condvar wait. Unpark 6180 * sets count to 1 and signals condvar. Only one thread ever waits 6181 * on the condvar. Contention seen when trying to park implies that someone 6182 * is unparking you, so don't wait. And spurious returns are fine, so there 6183 * is no need to track notifications. 6184 */ 6185 6186 #define MAX_SECS 100000000 6187 /* 6188 * This code is common to linux and solaris and will be moved to a 6189 * common place in dolphin. 6190 * 6191 * The passed in time value is either a relative time in nanoseconds 6192 * or an absolute time in milliseconds. Either way it has to be unpacked 6193 * into suitable seconds and nanoseconds components and stored in the 6194 * given timespec structure. 6195 * Given time is a 64-bit value and the time_t used in the timespec is only 6196 * a signed-32-bit value (except on 64-bit Linux) we have to watch for 6197 * overflow if times way in the future are given. Further on Solaris versions 6198 * prior to 10 there is a restriction (see cond_timedwait) that the specified 6199 * number of seconds, in abstime, is less than current_time + 100,000,000. 6200 * As it will be 28 years before "now + 100000000" will overflow we can 6201 * ignore overflow and just impose a hard-limit on seconds using the value 6202 * of "now + 100,000,000". This places a limit on the timeout of about 3.17 6203 * years from "now". 6204 */ 6205 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) { 6206 assert (time > 0, "convertTime"); 6207 6208 struct timeval now; 6209 int status = gettimeofday(&now, NULL); 6210 assert(status == 0, "gettimeofday"); 6211 6212 time_t max_secs = now.tv_sec + MAX_SECS; 6213 6214 if (isAbsolute) { 6215 jlong secs = time / 1000; 6216 if (secs > max_secs) { 6217 absTime->tv_sec = max_secs; 6218 } 6219 else { 6220 absTime->tv_sec = secs; 6221 } 6222 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; 6223 } 6224 else { 6225 jlong secs = time / NANOSECS_PER_SEC; 6226 if (secs >= MAX_SECS) { 6227 absTime->tv_sec = max_secs; 6228 absTime->tv_nsec = 0; 6229 } 6230 else { 6231 absTime->tv_sec = now.tv_sec + secs; 6232 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; 6233 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { 6234 absTime->tv_nsec -= NANOSECS_PER_SEC; 6235 ++absTime->tv_sec; // note: this must be <= max_secs 6236 } 6237 } 6238 } 6239 assert(absTime->tv_sec >= 0, "tv_sec < 0"); 6240 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); 6241 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); 6242 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); 6243 } 6244 6245 void Parker::park(bool isAbsolute, jlong time) { 6246 // Ideally we'd do something useful while spinning, such 6247 // as calling unpackTime(). 6248 6249 // Optional fast-path check: 6250 // Return immediately if a permit is available. 6251 // We depend on Atomic::xchg() having full barrier semantics 6252 // since we are doing a lock-free update to _counter. 6253 if (Atomic::xchg(0, &_counter) > 0) return; 6254 6255 // Optional fast-exit: Check interrupt before trying to wait 6256 Thread* thread = Thread::current(); 6257 assert(thread->is_Java_thread(), "Must be JavaThread"); 6258 JavaThread *jt = (JavaThread *)thread; 6259 if (Thread::is_interrupted(thread, false)) { 6260 return; 6261 } 6262 6263 // First, demultiplex/decode time arguments 6264 timespec absTime; 6265 if (time < 0 || (isAbsolute && time == 0) ) { // don't wait at all 6266 return; 6267 } 6268 if (time > 0) { 6269 // Warning: this code might be exposed to the old Solaris time 6270 // round-down bugs. Grep "roundingFix" for details. 6271 unpackTime(&absTime, isAbsolute, time); 6272 } 6273 6274 // Enter safepoint region 6275 // Beware of deadlocks such as 6317397. 6276 // The per-thread Parker:: _mutex is a classic leaf-lock. 6277 // In particular a thread must never block on the Threads_lock while 6278 // holding the Parker:: mutex. If safepoints are pending both the 6279 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. 6280 ThreadBlockInVM tbivm(jt); 6281 6282 // Don't wait if cannot get lock since interference arises from 6283 // unblocking. Also. check interrupt before trying wait 6284 if (Thread::is_interrupted(thread, false) || 6285 os::Solaris::mutex_trylock(_mutex) != 0) { 6286 return; 6287 } 6288 6289 int status ; 6290 6291 if (_counter > 0) { // no wait needed 6292 _counter = 0; 6293 status = os::Solaris::mutex_unlock(_mutex); 6294 assert (status == 0, "invariant") ; 6295 // Paranoia to ensure our locked and lock-free paths interact 6296 // correctly with each other and Java-level accesses. 6297 OrderAccess::fence(); 6298 return; 6299 } 6300 6301 #ifdef ASSERT 6302 // Don't catch signals while blocked; let the running threads have the signals. 6303 // (This allows a debugger to break into the running thread.) 6304 sigset_t oldsigs; 6305 sigset_t* allowdebug_blocked = os::Solaris::allowdebug_blocked_signals(); 6306 thr_sigsetmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); 6307 #endif 6308 6309 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 6310 jt->set_suspend_equivalent(); 6311 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 6312 6313 // Do this the hard way by blocking ... 6314 // See http://monaco.sfbay/detail.jsf?cr=5094058. 6315 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking. 6316 // Only for SPARC >= V8PlusA 6317 #if defined(__sparc) && defined(COMPILER2) 6318 if (ClearFPUAtPark) { _mark_fpu_nosave() ; } 6319 #endif 6320 6321 if (time == 0) { 6322 status = os::Solaris::cond_wait (_cond, _mutex) ; 6323 } else { 6324 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime); 6325 } 6326 // Note that an untimed cond_wait() can sometimes return ETIME on older 6327 // versions of the Solaris. 6328 assert_status(status == 0 || status == EINTR || 6329 status == ETIME || status == ETIMEDOUT, 6330 status, "cond_timedwait"); 6331 6332 #ifdef ASSERT 6333 thr_sigsetmask(SIG_SETMASK, &oldsigs, NULL); 6334 #endif 6335 _counter = 0 ; 6336 status = os::Solaris::mutex_unlock(_mutex); 6337 assert_status(status == 0, status, "mutex_unlock") ; 6338 // Paranoia to ensure our locked and lock-free paths interact 6339 // correctly with each other and Java-level accesses. 6340 OrderAccess::fence(); 6341 6342 // If externally suspended while waiting, re-suspend 6343 if (jt->handle_special_suspend_equivalent_condition()) { 6344 jt->java_suspend_self(); 6345 } 6346 } 6347 6348 void Parker::unpark() { 6349 int s, status ; 6350 status = os::Solaris::mutex_lock (_mutex) ; 6351 assert (status == 0, "invariant") ; 6352 s = _counter; 6353 _counter = 1; 6354 status = os::Solaris::mutex_unlock (_mutex) ; 6355 assert (status == 0, "invariant") ; 6356 6357 if (s < 1) { 6358 status = os::Solaris::cond_signal (_cond) ; 6359 assert (status == 0, "invariant") ; 6360 } 6361 } 6362 6363 extern char** environ; 6364 6365 // Run the specified command in a separate process. Return its exit value, 6366 // or -1 on failure (e.g. can't fork a new process). 6367 // Unlike system(), this function can be called from signal handler. It 6368 // doesn't block SIGINT et al. 6369 int os::fork_and_exec(char* cmd) { 6370 char * argv[4]; 6371 argv[0] = (char *)"sh"; 6372 argv[1] = (char *)"-c"; 6373 argv[2] = cmd; 6374 argv[3] = NULL; 6375 6376 // fork is async-safe, fork1 is not so can't use in signal handler 6377 pid_t pid; 6378 Thread* t = ThreadLocalStorage::get_thread_slow(); 6379 if (t != NULL && t->is_inside_signal_handler()) { 6380 pid = fork(); 6381 } else { 6382 pid = fork1(); 6383 } 6384 6385 if (pid < 0) { 6386 // fork failed 6387 warning("fork failed: %s", strerror(errno)); 6388 return -1; 6389 6390 } else if (pid == 0) { 6391 // child process 6392 6393 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris 6394 execve("/usr/bin/sh", argv, environ); 6395 6396 // execve failed 6397 _exit(-1); 6398 6399 } else { 6400 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 6401 // care about the actual exit code, for now. 6402 6403 int status; 6404 6405 // Wait for the child process to exit. This returns immediately if 6406 // the child has already exited. */ 6407 while (waitpid(pid, &status, 0) < 0) { 6408 switch (errno) { 6409 case ECHILD: return 0; 6410 case EINTR: break; 6411 default: return -1; 6412 } 6413 } 6414 6415 if (WIFEXITED(status)) { 6416 // The child exited normally; get its exit code. 6417 return WEXITSTATUS(status); 6418 } else if (WIFSIGNALED(status)) { 6419 // The child exited because of a signal 6420 // The best value to return is 0x80 + signal number, 6421 // because that is what all Unix shells do, and because 6422 // it allows callers to distinguish between process exit and 6423 // process death by signal. 6424 return 0x80 + WTERMSIG(status); 6425 } else { 6426 // Unknown exit code; pass it through 6427 return status; 6428 } 6429 } 6430 } 6431 6432 // is_headless_jre() 6433 // 6434 // Test for the existence of xawt/libmawt.so or libawt_xawt.so 6435 // in order to report if we are running in a headless jre 6436 // 6437 // Since JDK8 xawt/libmawt.so was moved into the same directory 6438 // as libawt.so, and renamed libawt_xawt.so 6439 // 6440 bool os::is_headless_jre() { 6441 struct stat statbuf; 6442 char buf[MAXPATHLEN]; 6443 char libmawtpath[MAXPATHLEN]; 6444 const char *xawtstr = "/xawt/libmawt.so"; 6445 const char *new_xawtstr = "/libawt_xawt.so"; 6446 char *p; 6447 6448 // Get path to libjvm.so 6449 os::jvm_path(buf, sizeof(buf)); 6450 6451 // Get rid of libjvm.so 6452 p = strrchr(buf, '/'); 6453 if (p == NULL) return false; 6454 else *p = '\0'; 6455 6456 // Get rid of client or server 6457 p = strrchr(buf, '/'); 6458 if (p == NULL) return false; 6459 else *p = '\0'; 6460 6461 // check xawt/libmawt.so 6462 strcpy(libmawtpath, buf); 6463 strcat(libmawtpath, xawtstr); 6464 if (::stat(libmawtpath, &statbuf) == 0) return false; 6465 6466 // check libawt_xawt.so 6467 strcpy(libmawtpath, buf); 6468 strcat(libmawtpath, new_xawtstr); 6469 if (::stat(libmawtpath, &statbuf) == 0) return false; 6470 6471 return true; 6472 } 6473 6474 size_t os::write(int fd, const void *buf, unsigned int nBytes) { 6475 INTERRUPTIBLE_RETURN_INT(::write(fd, buf, nBytes), os::Solaris::clear_interrupted); 6476 } 6477 6478 int os::close(int fd) { 6479 return ::close(fd); 6480 } 6481 6482 int os::socket_close(int fd) { 6483 return ::close(fd); 6484 } 6485 6486 int os::recv(int fd, char* buf, size_t nBytes, uint flags) { 6487 INTERRUPTIBLE_RETURN_INT((int)::recv(fd, buf, nBytes, flags), os::Solaris::clear_interrupted); 6488 } 6489 6490 int os::send(int fd, char* buf, size_t nBytes, uint flags) { 6491 INTERRUPTIBLE_RETURN_INT((int)::send(fd, buf, nBytes, flags), os::Solaris::clear_interrupted); 6492 } 6493 6494 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) { 6495 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags)); 6496 } 6497 6498 // As both poll and select can be interrupted by signals, we have to be 6499 // prepared to restart the system call after updating the timeout, unless 6500 // a poll() is done with timeout == -1, in which case we repeat with this 6501 // "wait forever" value. 6502 6503 int os::timeout(int fd, long timeout) { 6504 int res; 6505 struct timeval t; 6506 julong prevtime, newtime; 6507 static const char* aNull = 0; 6508 struct pollfd pfd; 6509 pfd.fd = fd; 6510 pfd.events = POLLIN; 6511 6512 gettimeofday(&t, &aNull); 6513 prevtime = ((julong)t.tv_sec * 1000) + t.tv_usec / 1000; 6514 6515 for(;;) { 6516 INTERRUPTIBLE_NORESTART(::poll(&pfd, 1, timeout), res, os::Solaris::clear_interrupted); 6517 if(res == OS_ERR && errno == EINTR) { 6518 if(timeout != -1) { 6519 gettimeofday(&t, &aNull); 6520 newtime = ((julong)t.tv_sec * 1000) + t.tv_usec /1000; 6521 timeout -= newtime - prevtime; 6522 if(timeout <= 0) 6523 return OS_OK; 6524 prevtime = newtime; 6525 } 6526 } else return res; 6527 } 6528 } 6529 6530 int os::connect(int fd, struct sockaddr *him, socklen_t len) { 6531 int _result; 6532 INTERRUPTIBLE_NORESTART(::connect(fd, him, len), _result,\ 6533 os::Solaris::clear_interrupted); 6534 6535 // Depending on when thread interruption is reset, _result could be 6536 // one of two values when errno == EINTR 6537 6538 if (((_result == OS_INTRPT) || (_result == OS_ERR)) 6539 && (errno == EINTR)) { 6540 /* restarting a connect() changes its errno semantics */ 6541 INTERRUPTIBLE(::connect(fd, him, len), _result,\ 6542 os::Solaris::clear_interrupted); 6543 /* undo these changes */ 6544 if (_result == OS_ERR) { 6545 if (errno == EALREADY) { 6546 errno = EINPROGRESS; /* fall through */ 6547 } else if (errno == EISCONN) { 6548 errno = 0; 6549 return OS_OK; 6550 } 6551 } 6552 } 6553 return _result; 6554 } 6555 6556 int os::accept(int fd, struct sockaddr* him, socklen_t* len) { 6557 if (fd < 0) { 6558 return OS_ERR; 6559 } 6560 INTERRUPTIBLE_RETURN_INT((int)::accept(fd, him, len),\ 6561 os::Solaris::clear_interrupted); 6562 } 6563 6564 int os::recvfrom(int fd, char* buf, size_t nBytes, uint flags, 6565 sockaddr* from, socklen_t* fromlen) { 6566 INTERRUPTIBLE_RETURN_INT((int)::recvfrom(fd, buf, nBytes, flags, from, fromlen),\ 6567 os::Solaris::clear_interrupted); 6568 } 6569 6570 int os::sendto(int fd, char* buf, size_t len, uint flags, 6571 struct sockaddr* to, socklen_t tolen) { 6572 INTERRUPTIBLE_RETURN_INT((int)::sendto(fd, buf, len, flags, to, tolen),\ 6573 os::Solaris::clear_interrupted); 6574 } 6575 6576 int os::socket_available(int fd, jint *pbytes) { 6577 if (fd < 0) { 6578 return OS_OK; 6579 } 6580 int ret; 6581 RESTARTABLE(::ioctl(fd, FIONREAD, pbytes), ret); 6582 // note: ioctl can return 0 when successful, JVM_SocketAvailable 6583 // is expected to return 0 on failure and 1 on success to the jdk. 6584 return (ret == OS_ERR) ? 0 : 1; 6585 } 6586 6587 int os::bind(int fd, struct sockaddr* him, socklen_t len) { 6588 INTERRUPTIBLE_RETURN_INT_NORESTART(::bind(fd, him, len),\ 6589 os::Solaris::clear_interrupted); 6590 } 6591 6592 // Get the default path to the core file 6593 // Returns the length of the string 6594 int os::get_core_path(char* buffer, size_t bufferSize) { 6595 const char* p = get_current_directory(buffer, bufferSize); 6596 6597 if (p == NULL) { 6598 assert(p != NULL, "failed to get current directory"); 6599 return 0; 6600 } 6601 6602 return strlen(buffer); 6603 } 6604 6605 #ifndef PRODUCT 6606 void TestReserveMemorySpecial_test() { 6607 // No tests available for this platform 6608 } 6609 #endif