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