1 /* 2 * Copyright (c) 1997, 2020, 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 "jvm.h" 27 #include "classfile/classLoader.hpp" 28 #include "classfile/systemDictionary.hpp" 29 #include "classfile/vmSymbols.hpp" 30 #include "code/icBuffer.hpp" 31 #include "code/vtableStubs.hpp" 32 #include "compiler/compileBroker.hpp" 33 #include "compiler/disassembler.hpp" 34 #include "interpreter/interpreter.hpp" 35 #include "logging/log.hpp" 36 #include "logging/logStream.hpp" 37 #include "memory/allocation.inline.hpp" 38 #include "memory/filemap.hpp" 39 #include "memory/universe.hpp" 40 #include "oops/oop.inline.hpp" 41 #include "os_share_solaris.hpp" 42 #include "os_solaris.inline.hpp" 43 #include "prims/jniFastGetField.hpp" 44 #include "prims/jvm_misc.hpp" 45 #include "runtime/arguments.hpp" 46 #include "runtime/atomic.hpp" 47 #include "runtime/extendedPC.hpp" 48 #include "runtime/globals.hpp" 49 #include "runtime/interfaceSupport.inline.hpp" 50 #include "runtime/java.hpp" 51 #include "runtime/javaCalls.hpp" 52 #include "runtime/mutexLocker.hpp" 53 #include "runtime/objectMonitor.hpp" 54 #include "runtime/orderAccess.hpp" 55 #include "runtime/osThread.hpp" 56 #include "runtime/perfMemory.hpp" 57 #include "runtime/sharedRuntime.hpp" 58 #include "runtime/statSampler.hpp" 59 #include "runtime/stubRoutines.hpp" 60 #include "runtime/thread.inline.hpp" 61 #include "runtime/threadCritical.hpp" 62 #include "runtime/timer.hpp" 63 #include "runtime/vm_version.hpp" 64 #include "semaphore_posix.hpp" 65 #include "services/attachListener.hpp" 66 #include "services/memTracker.hpp" 67 #include "services/runtimeService.hpp" 68 #include "utilities/align.hpp" 69 #include "utilities/decoder.hpp" 70 #include "utilities/defaultStream.hpp" 71 #include "utilities/events.hpp" 72 #include "utilities/growableArray.hpp" 73 #include "utilities/macros.hpp" 74 #include "utilities/vmError.hpp" 75 76 // put OS-includes here 77 # include <dlfcn.h> 78 # include <errno.h> 79 # include <exception> 80 # include <link.h> 81 # include <poll.h> 82 # include <pthread.h> 83 # include <setjmp.h> 84 # include <signal.h> 85 # include <stdio.h> 86 # include <alloca.h> 87 # include <sys/filio.h> 88 # include <sys/ipc.h> 89 # include <sys/lwp.h> 90 # include <sys/machelf.h> // for elf Sym structure used by dladdr1 91 # include <sys/mman.h> 92 # include <sys/processor.h> 93 # include <sys/procset.h> 94 # include <sys/pset.h> 95 # include <sys/resource.h> 96 # include <sys/shm.h> 97 # include <sys/socket.h> 98 # include <sys/stat.h> 99 # include <sys/systeminfo.h> 100 # include <sys/time.h> 101 # include <sys/times.h> 102 # include <sys/types.h> 103 # include <sys/wait.h> 104 # include <sys/utsname.h> 105 # include <thread.h> 106 # include <unistd.h> 107 # include <sys/priocntl.h> 108 # include <sys/rtpriocntl.h> 109 # include <sys/tspriocntl.h> 110 # include <sys/iapriocntl.h> 111 # include <sys/fxpriocntl.h> 112 # include <sys/loadavg.h> 113 # include <string.h> 114 # include <stdio.h> 115 116 # define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later 117 # include <sys/procfs.h> // see comment in <sys/procfs.h> 118 119 #define MAX_PATH (2 * K) 120 121 // for timer info max values which include all bits 122 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) 123 124 125 // Here are some liblgrp types from sys/lgrp_user.h to be able to 126 // compile on older systems without this header file. 127 128 #ifndef MADV_ACCESS_LWP 129 #define MADV_ACCESS_LWP 7 /* next LWP to access heavily */ 130 #endif 131 #ifndef MADV_ACCESS_MANY 132 #define MADV_ACCESS_MANY 8 /* many processes to access heavily */ 133 #endif 134 135 #ifndef LGRP_RSRC_CPU 136 #define LGRP_RSRC_CPU 0 /* CPU resources */ 137 #endif 138 #ifndef LGRP_RSRC_MEM 139 #define LGRP_RSRC_MEM 1 /* memory resources */ 140 #endif 141 142 // Values for ThreadPriorityPolicy == 1 143 int prio_policy1[CriticalPriority+1] = { 144 -99999, 0, 16, 32, 48, 64, 145 80, 96, 112, 124, 127, 127 }; 146 147 // System parameters used internally 148 static clock_t clock_tics_per_sec = 100; 149 150 // Track if we have called enable_extended_FILE_stdio (on Solaris 10u4+) 151 static bool enabled_extended_FILE_stdio = false; 152 153 // For diagnostics to print a message once. see run_periodic_checks 154 static bool check_addr0_done = false; 155 static sigset_t check_signal_done; 156 static bool check_signals = true; 157 158 address os::Solaris::handler_start; // start pc of thr_sighndlrinfo 159 address os::Solaris::handler_end; // end pc of thr_sighndlrinfo 160 161 address os::Solaris::_main_stack_base = NULL; // 4352906 workaround 162 163 os::Solaris::pthread_setname_np_func_t os::Solaris::_pthread_setname_np = NULL; 164 165 // "default" initializers for missing libc APIs 166 extern "C" { 167 static int lwp_mutex_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; } 168 static int lwp_mutex_destroy(mutex_t *mx) { return 0; } 169 170 static int lwp_cond_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; } 171 static int lwp_cond_destroy(cond_t *cv) { return 0; } 172 } 173 174 // "default" initializers for pthread-based synchronization 175 extern "C" { 176 static int pthread_mutex_default_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; } 177 static int pthread_cond_default_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; } 178 } 179 180 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time); 181 182 static inline size_t adjust_stack_size(address base, size_t size) { 183 if ((ssize_t)size < 0) { 184 // 4759953: Compensate for ridiculous stack size. 185 size = max_intx; 186 } 187 if (size > (size_t)base) { 188 // 4812466: Make sure size doesn't allow the stack to wrap the address space. 189 size = (size_t)base; 190 } 191 return size; 192 } 193 194 static inline stack_t get_stack_info() { 195 stack_t st; 196 int retval = thr_stksegment(&st); 197 st.ss_size = adjust_stack_size((address)st.ss_sp, st.ss_size); 198 assert(retval == 0, "incorrect return value from thr_stksegment"); 199 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned"); 200 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned"); 201 return st; 202 } 203 204 static void _handle_uncaught_cxx_exception() { 205 VMError::report_and_die("An uncaught C++ exception"); 206 } 207 208 bool os::is_primordial_thread(void) { 209 int r = thr_main(); 210 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689"); 211 return r == 1; 212 } 213 214 address os::current_stack_base() { 215 bool _is_primordial_thread = is_primordial_thread(); 216 217 // Workaround 4352906, avoid calls to thr_stksegment by 218 // thr_main after the first one (it looks like we trash 219 // some data, causing the value for ss_sp to be incorrect). 220 if (!_is_primordial_thread || os::Solaris::_main_stack_base == NULL) { 221 stack_t st = get_stack_info(); 222 if (_is_primordial_thread) { 223 // cache initial value of stack base 224 os::Solaris::_main_stack_base = (address)st.ss_sp; 225 } 226 return (address)st.ss_sp; 227 } else { 228 guarantee(os::Solaris::_main_stack_base != NULL, "Attempt to use null cached stack base"); 229 return os::Solaris::_main_stack_base; 230 } 231 } 232 233 size_t os::current_stack_size() { 234 size_t size; 235 236 if (!is_primordial_thread()) { 237 size = get_stack_info().ss_size; 238 } else { 239 struct rlimit limits; 240 getrlimit(RLIMIT_STACK, &limits); 241 size = adjust_stack_size(os::Solaris::_main_stack_base, (size_t)limits.rlim_cur); 242 } 243 // base may not be page aligned 244 address base = current_stack_base(); 245 address bottom = align_up(base - size, os::vm_page_size());; 246 return (size_t)(base - bottom); 247 } 248 249 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 250 return localtime_r(clock, res); 251 } 252 253 void os::Solaris::try_enable_extended_io() { 254 typedef int (*enable_extended_FILE_stdio_t)(int, int); 255 256 if (!UseExtendedFileIO) { 257 return; 258 } 259 260 enable_extended_FILE_stdio_t enabler = 261 (enable_extended_FILE_stdio_t) dlsym(RTLD_DEFAULT, 262 "enable_extended_FILE_stdio"); 263 if (enabler) { 264 enabler(-1, -1); 265 } 266 } 267 268 jint os::Solaris::_os_thread_limit = 0; 269 volatile jint os::Solaris::_os_thread_count = 0; 270 271 julong os::available_memory() { 272 return Solaris::available_memory(); 273 } 274 275 julong os::Solaris::available_memory() { 276 return (julong)sysconf(_SC_AVPHYS_PAGES) * os::vm_page_size(); 277 } 278 279 julong os::Solaris::_physical_memory = 0; 280 281 julong os::physical_memory() { 282 return Solaris::physical_memory(); 283 } 284 285 static hrtime_t first_hrtime = 0; 286 static const hrtime_t hrtime_hz = 1000*1000*1000; 287 static volatile hrtime_t max_hrtime = 0; 288 289 290 void os::Solaris::initialize_system_info() { 291 set_processor_count(sysconf(_SC_NPROCESSORS_CONF)); 292 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) * 293 (julong)sysconf(_SC_PAGESIZE); 294 } 295 296 uint os::processor_id() { 297 const processorid_t id = ::getcpuid(); 298 assert(id >= 0 && id < _processor_count, "Invalid processor id"); 299 return (uint)id; 300 } 301 302 int os::active_processor_count() { 303 // User has overridden the number of active processors 304 if (ActiveProcessorCount > 0) { 305 log_trace(os)("active_processor_count: " 306 "active processor count set by user : %d", 307 ActiveProcessorCount); 308 return ActiveProcessorCount; 309 } 310 311 int online_cpus = sysconf(_SC_NPROCESSORS_ONLN); 312 pid_t pid = getpid(); 313 psetid_t pset = PS_NONE; 314 // Are we running in a processor set or is there any processor set around? 315 if (pset_bind(PS_QUERY, P_PID, pid, &pset) == 0) { 316 uint_t pset_cpus; 317 // Query the number of cpus available to us. 318 if (pset_info(pset, NULL, &pset_cpus, NULL) == 0) { 319 assert(pset_cpus > 0 && pset_cpus <= online_cpus, "sanity check"); 320 return pset_cpus; 321 } 322 } 323 // Otherwise return number of online cpus 324 return online_cpus; 325 } 326 327 void os::set_native_thread_name(const char *name) { 328 if (Solaris::_pthread_setname_np != NULL) { 329 // Only the first 31 bytes of 'name' are processed by pthread_setname_np 330 // but we explicitly copy into a size-limited buffer to avoid any 331 // possible overflow. 332 char buf[32]; 333 snprintf(buf, sizeof(buf), "%s", name); 334 buf[sizeof(buf) - 1] = '\0'; 335 Solaris::_pthread_setname_np(pthread_self(), buf); 336 } 337 } 338 339 bool os::bind_to_processor(uint processor_id) { 340 // We assume that a processorid_t can be stored in a uint. 341 assert(sizeof(uint) == sizeof(processorid_t), 342 "can't convert uint to processorid_t"); 343 int bind_result = 344 processor_bind(P_LWPID, // bind LWP. 345 P_MYID, // bind current LWP. 346 (processorid_t) processor_id, // id. 347 NULL); // don't return old binding. 348 return (bind_result == 0); 349 } 350 351 // Return true if user is running as root. 352 353 bool os::have_special_privileges() { 354 static bool init = false; 355 static bool privileges = false; 356 if (!init) { 357 privileges = (getuid() != geteuid()) || (getgid() != getegid()); 358 init = true; 359 } 360 return privileges; 361 } 362 363 364 void os::init_system_properties_values() { 365 // The next steps are taken in the product version: 366 // 367 // Obtain the JAVA_HOME value from the location of libjvm.so. 368 // This library should be located at: 369 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so. 370 // 371 // If "/jre/lib/" appears at the right place in the path, then we 372 // assume libjvm.so is installed in a JDK and we use this path. 373 // 374 // Otherwise exit with message: "Could not create the Java virtual machine." 375 // 376 // The following extra steps are taken in the debugging version: 377 // 378 // If "/jre/lib/" does NOT appear at the right place in the path 379 // instead of exit check for $JAVA_HOME environment variable. 380 // 381 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, 382 // then we append a fake suffix "hotspot/libjvm.so" to this path so 383 // it looks like libjvm.so is installed there 384 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so. 385 // 386 // Otherwise exit. 387 // 388 // Important note: if the location of libjvm.so changes this 389 // code needs to be changed accordingly. 390 391 // Base path of extensions installed on the system. 392 #define SYS_EXT_DIR "/usr/jdk/packages" 393 #define EXTENSIONS_DIR "/lib/ext" 394 395 // Buffer that fits several sprintfs. 396 // Note that the space for the colon and the trailing null are provided 397 // by the nulls included by the sizeof operator. 398 const size_t bufsize = 399 MAX3((size_t)MAXPATHLEN, // For dll_dir & friends. 400 sizeof(SYS_EXT_DIR) + sizeof("/lib/"), // invariant ld_library_path 401 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR)); // extensions dir 402 char *buf = NEW_C_HEAP_ARRAY(char, bufsize, mtInternal); 403 404 // sysclasspath, java_home, dll_dir 405 { 406 char *pslash; 407 os::jvm_path(buf, bufsize); 408 409 // Found the full path to libjvm.so. 410 // Now cut the path to <java_home>/jre if we can. 411 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so. 412 pslash = strrchr(buf, '/'); 413 if (pslash != NULL) { 414 *pslash = '\0'; // Get rid of /{client|server|hotspot}. 415 } 416 Arguments::set_dll_dir(buf); 417 418 if (pslash != NULL) { 419 pslash = strrchr(buf, '/'); 420 if (pslash != NULL) { 421 *pslash = '\0'; // Get rid of /lib. 422 } 423 } 424 Arguments::set_java_home(buf); 425 if (!set_boot_path('/', ':')) { 426 vm_exit_during_initialization("Failed setting boot class path.", NULL); 427 } 428 } 429 430 // Where to look for native libraries. 431 { 432 // Use dlinfo() to determine the correct java.library.path. 433 // 434 // If we're launched by the Java launcher, and the user 435 // does not set java.library.path explicitly on the commandline, 436 // the Java launcher sets LD_LIBRARY_PATH for us and unsets 437 // LD_LIBRARY_PATH_32 and LD_LIBRARY_PATH_64. In this case 438 // dlinfo returns LD_LIBRARY_PATH + crle settings (including 439 // /usr/lib), which is exactly what we want. 440 // 441 // If the user does set java.library.path, it completely 442 // overwrites this setting, and always has. 443 // 444 // If we're not launched by the Java launcher, we may 445 // get here with any/all of the LD_LIBRARY_PATH[_32|64] 446 // settings. Again, dlinfo does exactly what we want. 447 448 Dl_serinfo info_sz, *info = &info_sz; 449 Dl_serpath *path; 450 char *library_path; 451 char *common_path = buf; 452 453 // Determine search path count and required buffer size. 454 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFOSIZE, (void *)info) == -1) { 455 FREE_C_HEAP_ARRAY(char, buf); 456 vm_exit_during_initialization("dlinfo SERINFOSIZE request", dlerror()); 457 } 458 459 // Allocate new buffer and initialize. 460 info = (Dl_serinfo*)NEW_C_HEAP_ARRAY(char, info_sz.dls_size, mtInternal); 461 info->dls_size = info_sz.dls_size; 462 info->dls_cnt = info_sz.dls_cnt; 463 464 // Obtain search path information. 465 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFO, (void *)info) == -1) { 466 FREE_C_HEAP_ARRAY(char, buf); 467 FREE_C_HEAP_ARRAY(char, info); 468 vm_exit_during_initialization("dlinfo SERINFO request", dlerror()); 469 } 470 471 path = &info->dls_serpath[0]; 472 473 // Note: Due to a legacy implementation, most of the library path 474 // is set in the launcher. This was to accomodate linking restrictions 475 // on legacy Solaris implementations (which are no longer supported). 476 // Eventually, all the library path setting will be done here. 477 // 478 // However, to prevent the proliferation of improperly built native 479 // libraries, the new path component /usr/jdk/packages is added here. 480 481 // Construct the invariant part of ld_library_path. 482 sprintf(common_path, SYS_EXT_DIR "/lib"); 483 484 // Struct size is more than sufficient for the path components obtained 485 // through the dlinfo() call, so only add additional space for the path 486 // components explicitly added here. 487 size_t library_path_size = info->dls_size + strlen(common_path); 488 library_path = NEW_C_HEAP_ARRAY(char, library_path_size, mtInternal); 489 library_path[0] = '\0'; 490 491 // Construct the desired Java library path from the linker's library 492 // search path. 493 // 494 // For compatibility, it is optimal that we insert the additional path 495 // components specific to the Java VM after those components specified 496 // in LD_LIBRARY_PATH (if any) but before those added by the ld.so 497 // infrastructure. 498 if (info->dls_cnt == 0) { // Not sure this can happen, but allow for it. 499 strcpy(library_path, common_path); 500 } else { 501 int inserted = 0; 502 int i; 503 for (i = 0; i < info->dls_cnt; i++, path++) { 504 uint_t flags = path->dls_flags & LA_SER_MASK; 505 if (((flags & LA_SER_LIBPATH) == 0) && !inserted) { 506 strcat(library_path, common_path); 507 strcat(library_path, os::path_separator()); 508 inserted = 1; 509 } 510 strcat(library_path, path->dls_name); 511 strcat(library_path, os::path_separator()); 512 } 513 // Eliminate trailing path separator. 514 library_path[strlen(library_path)-1] = '\0'; 515 } 516 517 // happens before argument parsing - can't use a trace flag 518 // tty->print_raw("init_system_properties_values: native lib path: "); 519 // tty->print_raw_cr(library_path); 520 521 // Callee copies into its own buffer. 522 Arguments::set_library_path(library_path); 523 524 FREE_C_HEAP_ARRAY(char, library_path); 525 FREE_C_HEAP_ARRAY(char, info); 526 } 527 528 // Extensions directories. 529 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home()); 530 Arguments::set_ext_dirs(buf); 531 532 FREE_C_HEAP_ARRAY(char, buf); 533 534 #undef SYS_EXT_DIR 535 #undef EXTENSIONS_DIR 536 } 537 538 void os::breakpoint() { 539 BREAKPOINT; 540 } 541 542 extern "C" void breakpoint() { 543 // use debugger to set breakpoint here 544 } 545 546 static thread_t main_thread; 547 548 // Thread start routine for all newly created threads 549 extern "C" void* thread_native_entry(void* thread_addr) { 550 551 Thread* thread = (Thread*)thread_addr; 552 553 thread->record_stack_base_and_size(); 554 555 // Try to randomize the cache line index of hot stack frames. 556 // This helps when threads of the same stack traces evict each other's 557 // cache lines. The threads can be either from the same JVM instance, or 558 // from different JVM instances. The benefit is especially true for 559 // processors with hyperthreading technology. 560 static int counter = 0; 561 int pid = os::current_process_id(); 562 alloca(((pid ^ counter++) & 7) * 128); 563 564 int prio; 565 566 thread->initialize_thread_current(); 567 568 OSThread* osthr = thread->osthread(); 569 570 osthr->set_lwp_id(_lwp_self()); // Store lwp in case we are bound 571 572 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ").", 573 os::current_thread_id()); 574 575 if (UseNUMA) { 576 int lgrp_id = os::numa_get_group_id(); 577 if (lgrp_id != -1) { 578 thread->set_lgrp_id(lgrp_id); 579 } 580 } 581 582 // Our priority was set when we were created, and stored in the 583 // osthread, but couldn't be passed through to our LWP until now. 584 // So read back the priority and set it again. 585 586 if (osthr->thread_id() != -1) { 587 if (UseThreadPriorities) { 588 int prio = osthr->native_priority(); 589 if (ThreadPriorityVerbose) { 590 tty->print_cr("Starting Thread " INTPTR_FORMAT ", LWP is " 591 INTPTR_FORMAT ", setting priority: %d\n", 592 osthr->thread_id(), osthr->lwp_id(), prio); 593 } 594 os::set_native_priority(thread, prio); 595 } 596 } else if (ThreadPriorityVerbose) { 597 warning("Can't set priority in _start routine, thread id hasn't been set\n"); 598 } 599 600 assert(osthr->get_state() == RUNNABLE, "invalid os thread state"); 601 602 // initialize signal mask for this thread 603 os::Solaris::hotspot_sigmask(thread); 604 605 os::Solaris::init_thread_fpu_state(); 606 std::set_terminate(_handle_uncaught_cxx_exception); 607 608 thread->call_run(); 609 610 // Note: at this point the thread object may already have deleted itself. 611 // Do not dereference it from here on out. 612 613 // One less thread is executing 614 // When the VMThread gets here, the main thread may have already exited 615 // which frees the CodeHeap containing the Atomic::dec code 616 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) { 617 Atomic::dec(&os::Solaris::_os_thread_count); 618 } 619 620 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ").", os::current_thread_id()); 621 622 if (UseDetachedThreads) { 623 thr_exit(NULL); 624 ShouldNotReachHere(); 625 } 626 return NULL; 627 } 628 629 static OSThread* create_os_thread(Thread* thread, thread_t thread_id) { 630 // Allocate the OSThread object 631 OSThread* osthread = new OSThread(NULL, NULL); 632 if (osthread == NULL) return NULL; 633 634 // Store info on the Solaris thread into the OSThread 635 osthread->set_thread_id(thread_id); 636 osthread->set_lwp_id(_lwp_self()); 637 638 if (UseNUMA) { 639 int lgrp_id = os::numa_get_group_id(); 640 if (lgrp_id != -1) { 641 thread->set_lgrp_id(lgrp_id); 642 } 643 } 644 645 if (ThreadPriorityVerbose) { 646 tty->print_cr("In create_os_thread, Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT "\n", 647 osthread->thread_id(), osthread->lwp_id()); 648 } 649 650 // Initial thread state is INITIALIZED, not SUSPENDED 651 osthread->set_state(INITIALIZED); 652 653 return osthread; 654 } 655 656 void os::Solaris::hotspot_sigmask(Thread* thread) { 657 //Save caller's signal mask 658 sigset_t sigmask; 659 pthread_sigmask(SIG_SETMASK, NULL, &sigmask); 660 OSThread *osthread = thread->osthread(); 661 osthread->set_caller_sigmask(sigmask); 662 663 pthread_sigmask(SIG_UNBLOCK, os::Solaris::unblocked_signals(), NULL); 664 if (!ReduceSignalUsage) { 665 if (thread->is_VM_thread()) { 666 // Only the VM thread handles BREAK_SIGNAL ... 667 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); 668 } else { 669 // ... all other threads block BREAK_SIGNAL 670 assert(!sigismember(vm_signals(), SIGINT), "SIGINT should not be blocked"); 671 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); 672 } 673 } 674 } 675 676 bool os::create_attached_thread(JavaThread* thread) { 677 #ifdef ASSERT 678 thread->verify_not_published(); 679 #endif 680 OSThread* osthread = create_os_thread(thread, thr_self()); 681 if (osthread == NULL) { 682 return false; 683 } 684 685 // Initial thread state is RUNNABLE 686 osthread->set_state(RUNNABLE); 687 thread->set_osthread(osthread); 688 689 // initialize signal mask for this thread 690 // and save the caller's signal mask 691 os::Solaris::hotspot_sigmask(thread); 692 693 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ").", 694 os::current_thread_id()); 695 696 return true; 697 } 698 699 bool os::create_main_thread(JavaThread* thread) { 700 #ifdef ASSERT 701 thread->verify_not_published(); 702 #endif 703 if (_starting_thread == NULL) { 704 _starting_thread = create_os_thread(thread, main_thread); 705 if (_starting_thread == NULL) { 706 return false; 707 } 708 } 709 710 // The primodial thread is runnable from the start 711 _starting_thread->set_state(RUNNABLE); 712 713 thread->set_osthread(_starting_thread); 714 715 // initialize signal mask for this thread 716 // and save the caller's signal mask 717 os::Solaris::hotspot_sigmask(thread); 718 719 return true; 720 } 721 722 // Helper function to trace thread attributes, similar to os::Posix::describe_pthread_attr() 723 static char* describe_thr_create_attributes(char* buf, size_t buflen, 724 size_t stacksize, long flags) { 725 stringStream ss(buf, buflen); 726 ss.print("stacksize: " SIZE_FORMAT "k, ", stacksize / 1024); 727 ss.print("flags: "); 728 #define PRINT_FLAG(f) if (flags & f) ss.print( #f " "); 729 #define ALL(X) \ 730 X(THR_SUSPENDED) \ 731 X(THR_DETACHED) \ 732 X(THR_BOUND) \ 733 X(THR_NEW_LWP) \ 734 X(THR_DAEMON) 735 ALL(PRINT_FLAG) 736 #undef ALL 737 #undef PRINT_FLAG 738 return buf; 739 } 740 741 // return default stack size for thr_type 742 size_t os::Posix::default_stack_size(os::ThreadType thr_type) { 743 // default stack size when not specified by caller is 1M (2M for LP64) 744 size_t s = (BytesPerWord >> 2) * K * K; 745 return s; 746 } 747 748 bool os::create_thread(Thread* thread, ThreadType thr_type, 749 size_t req_stack_size) { 750 // Allocate the OSThread object 751 OSThread* osthread = new OSThread(NULL, NULL); 752 if (osthread == NULL) { 753 return false; 754 } 755 756 if (ThreadPriorityVerbose) { 757 char *thrtyp; 758 switch (thr_type) { 759 case vm_thread: 760 thrtyp = (char *)"vm"; 761 break; 762 case cgc_thread: 763 thrtyp = (char *)"cgc"; 764 break; 765 case pgc_thread: 766 thrtyp = (char *)"pgc"; 767 break; 768 case java_thread: 769 thrtyp = (char *)"java"; 770 break; 771 case compiler_thread: 772 thrtyp = (char *)"compiler"; 773 break; 774 case watcher_thread: 775 thrtyp = (char *)"watcher"; 776 break; 777 default: 778 thrtyp = (char *)"unknown"; 779 break; 780 } 781 tty->print_cr("In create_thread, creating a %s thread\n", thrtyp); 782 } 783 784 // calculate stack size if it's not specified by caller 785 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size); 786 787 // Initial state is ALLOCATED but not INITIALIZED 788 osthread->set_state(ALLOCATED); 789 790 if (os::Solaris::_os_thread_count > os::Solaris::_os_thread_limit) { 791 // We got lots of threads. Check if we still have some address space left. 792 // Need to be at least 5Mb of unreserved address space. We do check by 793 // trying to reserve some. 794 const size_t VirtualMemoryBangSize = 20*K*K; 795 char* mem = os::reserve_memory(VirtualMemoryBangSize); 796 if (mem == NULL) { 797 delete osthread; 798 return false; 799 } else { 800 // Release the memory again 801 os::release_memory(mem, VirtualMemoryBangSize); 802 } 803 } 804 805 // Setup osthread because the child thread may need it. 806 thread->set_osthread(osthread); 807 808 // Create the Solaris thread 809 thread_t tid = 0; 810 long flags = (UseDetachedThreads ? THR_DETACHED : 0) | THR_SUSPENDED; 811 int status; 812 813 // Mark that we don't have an lwp or thread id yet. 814 // In case we attempt to set the priority before the thread starts. 815 osthread->set_lwp_id(-1); 816 osthread->set_thread_id(-1); 817 818 status = thr_create(NULL, stack_size, thread_native_entry, thread, flags, &tid); 819 820 char buf[64]; 821 if (status == 0) { 822 log_info(os, thread)("Thread started (tid: " UINTX_FORMAT ", attributes: %s). ", 823 (uintx) tid, describe_thr_create_attributes(buf, sizeof(buf), stack_size, flags)); 824 } else { 825 log_warning(os, thread)("Failed to start thread - thr_create failed (%s) for attributes: %s.", 826 os::errno_name(status), describe_thr_create_attributes(buf, sizeof(buf), stack_size, flags)); 827 // Log some OS information which might explain why creating the thread failed. 828 log_info(os, thread)("Number of threads approx. running in the VM: %d", Threads::number_of_threads()); 829 LogStream st(Log(os, thread)::info()); 830 os::Posix::print_rlimit_info(&st); 831 os::print_memory_info(&st); 832 } 833 834 if (status != 0) { 835 thread->set_osthread(NULL); 836 // Need to clean up stuff we've allocated so far 837 delete osthread; 838 return false; 839 } 840 841 Atomic::inc(&os::Solaris::_os_thread_count); 842 843 // Store info on the Solaris thread into the OSThread 844 osthread->set_thread_id(tid); 845 846 // Remember that we created this thread so we can set priority on it 847 osthread->set_vm_created(); 848 849 // Most thread types will set an explicit priority before starting the thread, 850 // but for those that don't we need a valid value to read back in thread_native_entry. 851 osthread->set_native_priority(NormPriority); 852 853 // Initial thread state is INITIALIZED, not SUSPENDED 854 osthread->set_state(INITIALIZED); 855 856 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain 857 return true; 858 } 859 860 debug_only(static bool signal_sets_initialized = false); 861 static sigset_t unblocked_sigs, vm_sigs; 862 863 void os::Solaris::signal_sets_init() { 864 // Should also have an assertion stating we are still single-threaded. 865 assert(!signal_sets_initialized, "Already initialized"); 866 // Fill in signals that are necessarily unblocked for all threads in 867 // the VM. Currently, we unblock the following signals: 868 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden 869 // by -Xrs (=ReduceSignalUsage)); 870 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all 871 // other threads. The "ReduceSignalUsage" boolean tells us not to alter 872 // the dispositions or masks wrt these signals. 873 // Programs embedding the VM that want to use the above signals for their 874 // own purposes must, at this time, use the "-Xrs" option to prevent 875 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. 876 // (See bug 4345157, and other related bugs). 877 // In reality, though, unblocking these signals is really a nop, since 878 // these signals are not blocked by default. 879 sigemptyset(&unblocked_sigs); 880 sigaddset(&unblocked_sigs, SIGILL); 881 sigaddset(&unblocked_sigs, SIGSEGV); 882 sigaddset(&unblocked_sigs, SIGBUS); 883 sigaddset(&unblocked_sigs, SIGFPE); 884 sigaddset(&unblocked_sigs, ASYNC_SIGNAL); 885 886 if (!ReduceSignalUsage) { 887 if (!os::Posix::is_sig_ignored(SHUTDOWN1_SIGNAL)) { 888 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); 889 } 890 if (!os::Posix::is_sig_ignored(SHUTDOWN2_SIGNAL)) { 891 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); 892 } 893 if (!os::Posix::is_sig_ignored(SHUTDOWN3_SIGNAL)) { 894 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); 895 } 896 } 897 // Fill in signals that are blocked by all but the VM thread. 898 sigemptyset(&vm_sigs); 899 if (!ReduceSignalUsage) { 900 sigaddset(&vm_sigs, BREAK_SIGNAL); 901 } 902 debug_only(signal_sets_initialized = true); 903 904 // For diagnostics only used in run_periodic_checks 905 sigemptyset(&check_signal_done); 906 } 907 908 // These are signals that are unblocked while a thread is running Java. 909 // (For some reason, they get blocked by default.) 910 sigset_t* os::Solaris::unblocked_signals() { 911 assert(signal_sets_initialized, "Not initialized"); 912 return &unblocked_sigs; 913 } 914 915 // These are the signals that are blocked while a (non-VM) thread is 916 // running Java. Only the VM thread handles these signals. 917 sigset_t* os::Solaris::vm_signals() { 918 assert(signal_sets_initialized, "Not initialized"); 919 return &vm_sigs; 920 } 921 922 // CR 7190089: on Solaris, primordial thread's stack needs adjusting. 923 // Without the adjustment, stack size is incorrect if stack is set to unlimited (ulimit -s unlimited). 924 void os::Solaris::correct_stack_boundaries_for_primordial_thread(Thread* thr) { 925 assert(is_primordial_thread(), "Call only for primordial thread"); 926 927 JavaThread* jt = (JavaThread *)thr; 928 assert(jt != NULL, "Sanity check"); 929 size_t stack_size; 930 address base = jt->stack_base(); 931 if (Arguments::created_by_java_launcher()) { 932 // Use 2MB to allow for Solaris 7 64 bit mode. 933 stack_size = JavaThread::stack_size_at_create() == 0 934 ? 2048*K : JavaThread::stack_size_at_create(); 935 936 // There are rare cases when we may have already used more than 937 // the basic stack size allotment before this method is invoked. 938 // Attempt to allow for a normally sized java_stack. 939 size_t current_stack_offset = (size_t)(base - (address)&stack_size); 940 stack_size += ReservedSpace::page_align_size_down(current_stack_offset); 941 } else { 942 // 6269555: If we were not created by a Java launcher, i.e. if we are 943 // running embedded in a native application, treat the primordial thread 944 // as much like a native attached thread as possible. This means using 945 // the current stack size from thr_stksegment(), unless it is too large 946 // to reliably setup guard pages. A reasonable max size is 8MB. 947 size_t current_size = os::current_stack_size(); 948 // This should never happen, but just in case.... 949 if (current_size == 0) current_size = 2 * K * K; 950 stack_size = current_size > (8 * K * K) ? (8 * K * K) : current_size; 951 } 952 address bottom = align_up(base - stack_size, os::vm_page_size());; 953 stack_size = (size_t)(base - bottom); 954 955 assert(stack_size > 0, "Stack size calculation problem"); 956 957 if (stack_size > jt->stack_size()) { 958 #ifndef PRODUCT 959 struct rlimit limits; 960 getrlimit(RLIMIT_STACK, &limits); 961 size_t size = adjust_stack_size(base, (size_t)limits.rlim_cur); 962 assert(size >= jt->stack_size(), "Stack size problem in main thread"); 963 #endif 964 tty->print_cr("Stack size of %d Kb exceeds current limit of %d Kb.\n" 965 "(Stack sizes are rounded up to a multiple of the system page size.)\n" 966 "See limit(1) to increase the stack size limit.", 967 stack_size / K, jt->stack_size() / K); 968 vm_exit(1); 969 } 970 assert(jt->stack_size() >= stack_size, 971 "Attempt to map more stack than was allocated"); 972 jt->set_stack_size(stack_size); 973 974 } 975 976 977 978 // Free Solaris resources related to the OSThread 979 void os::free_thread(OSThread* osthread) { 980 assert(osthread != NULL, "os::free_thread but osthread not set"); 981 982 // We are told to free resources of the argument thread, 983 // but we can only really operate on the current thread. 984 assert(Thread::current()->osthread() == osthread, 985 "os::free_thread but not current thread"); 986 987 // Restore caller's signal mask 988 sigset_t sigmask = osthread->caller_sigmask(); 989 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); 990 991 delete osthread; 992 } 993 994 void os::pd_start_thread(Thread* thread) { 995 int status = thr_continue(thread->osthread()->thread_id()); 996 assert_status(status == 0, status, "thr_continue failed"); 997 } 998 999 1000 intx os::current_thread_id() { 1001 return (intx)thr_self(); 1002 } 1003 1004 static pid_t _initial_pid = 0; 1005 1006 int os::current_process_id() { 1007 return (int)(_initial_pid ? _initial_pid : getpid()); 1008 } 1009 1010 // gethrtime() should be monotonic according to the documentation, 1011 // but some virtualized platforms are known to break this guarantee. 1012 // getTimeNanos() must be guaranteed not to move backwards, so we 1013 // are forced to add a check here. 1014 inline hrtime_t getTimeNanos() { 1015 const hrtime_t now = gethrtime(); 1016 const hrtime_t prev = max_hrtime; 1017 if (now <= prev) { 1018 return prev; // same or retrograde time; 1019 } 1020 const hrtime_t obsv = Atomic::cmpxchg(&max_hrtime, prev, now); 1021 assert(obsv >= prev, "invariant"); // Monotonicity 1022 // If the CAS succeeded then we're done and return "now". 1023 // If the CAS failed and the observed value "obsv" is >= now then 1024 // we should return "obsv". If the CAS failed and now > obsv > prv then 1025 // some other thread raced this thread and installed a new value, in which case 1026 // we could either (a) retry the entire operation, (b) retry trying to install now 1027 // or (c) just return obsv. We use (c). No loop is required although in some cases 1028 // we might discard a higher "now" value in deference to a slightly lower but freshly 1029 // installed obsv value. That's entirely benign -- it admits no new orderings compared 1030 // to (a) or (b) -- and greatly reduces coherence traffic. 1031 // We might also condition (c) on the magnitude of the delta between obsv and now. 1032 // Avoiding excessive CAS operations to hot RW locations is critical. 1033 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate 1034 return (prev == obsv) ? now : obsv; 1035 } 1036 1037 // Time since start-up in seconds to a fine granularity. 1038 // Used by VMSelfDestructTimer and the MemProfiler. 1039 double os::elapsedTime() { 1040 return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz; 1041 } 1042 1043 jlong os::elapsed_counter() { 1044 return (jlong)(getTimeNanos() - first_hrtime); 1045 } 1046 1047 jlong os::elapsed_frequency() { 1048 return hrtime_hz; 1049 } 1050 1051 // Return the real, user, and system times in seconds from an 1052 // arbitrary fixed point in the past. 1053 bool os::getTimesSecs(double* process_real_time, 1054 double* process_user_time, 1055 double* process_system_time) { 1056 struct tms ticks; 1057 clock_t real_ticks = times(&ticks); 1058 1059 if (real_ticks == (clock_t) (-1)) { 1060 return false; 1061 } else { 1062 double ticks_per_second = (double) clock_tics_per_sec; 1063 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; 1064 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; 1065 // For consistency return the real time from getTimeNanos() 1066 // converted to seconds. 1067 *process_real_time = ((double) getTimeNanos()) / ((double) NANOUNITS); 1068 1069 return true; 1070 } 1071 } 1072 1073 bool os::supports_vtime() { return true; } 1074 1075 double os::elapsedVTime() { 1076 return (double)gethrvtime() / (double)hrtime_hz; 1077 } 1078 1079 // Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis 1080 jlong os::javaTimeMillis() { 1081 timeval t; 1082 if (gettimeofday(&t, NULL) == -1) { 1083 fatal("os::javaTimeMillis: gettimeofday (%s)", os::strerror(errno)); 1084 } 1085 return jlong(t.tv_sec) * 1000 + jlong(t.tv_usec) / 1000; 1086 } 1087 1088 // Must return seconds+nanos since Jan 1 1970. This must use the same 1089 // time source as javaTimeMillis and can't use get_nsec_fromepoch as 1090 // we need better than 1ms accuracy 1091 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) { 1092 timeval t; 1093 if (gettimeofday(&t, NULL) == -1) { 1094 fatal("os::javaTimeSystemUTC: gettimeofday (%s)", os::strerror(errno)); 1095 } 1096 seconds = jlong(t.tv_sec); 1097 nanos = jlong(t.tv_usec) * 1000; 1098 } 1099 1100 1101 jlong os::javaTimeNanos() { 1102 return (jlong)getTimeNanos(); 1103 } 1104 1105 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 1106 info_ptr->max_value = ALL_64_BITS; // gethrtime() uses all 64 bits 1107 info_ptr->may_skip_backward = false; // not subject to resetting or drifting 1108 info_ptr->may_skip_forward = false; // not subject to resetting or drifting 1109 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 1110 } 1111 1112 char * os::local_time_string(char *buf, size_t buflen) { 1113 struct tm t; 1114 time_t long_time; 1115 time(&long_time); 1116 localtime_r(&long_time, &t); 1117 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 1118 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, 1119 t.tm_hour, t.tm_min, t.tm_sec); 1120 return buf; 1121 } 1122 1123 // Note: os::shutdown() might be called very early during initialization, or 1124 // called from signal handler. Before adding something to os::shutdown(), make 1125 // sure it is async-safe and can handle partially initialized VM. 1126 void os::shutdown() { 1127 1128 // allow PerfMemory to attempt cleanup of any persistent resources 1129 perfMemory_exit(); 1130 1131 // needs to remove object in file system 1132 AttachListener::abort(); 1133 1134 // flush buffered output, finish log files 1135 ostream_abort(); 1136 1137 // Check for abort hook 1138 abort_hook_t abort_hook = Arguments::abort_hook(); 1139 if (abort_hook != NULL) { 1140 abort_hook(); 1141 } 1142 } 1143 1144 // Note: os::abort() might be called very early during initialization, or 1145 // called from signal handler. Before adding something to os::abort(), make 1146 // sure it is async-safe and can handle partially initialized VM. 1147 void os::abort(bool dump_core, void* siginfo, const void* context) { 1148 os::shutdown(); 1149 if (dump_core) { 1150 ::abort(); // dump core (for debugging) 1151 } 1152 1153 ::exit(1); 1154 } 1155 1156 // Die immediately, no exit hook, no abort hook, no cleanup. 1157 // Dump a core file, if possible, for debugging. 1158 void os::die() { 1159 if (TestUnresponsiveErrorHandler && !CreateCoredumpOnCrash) { 1160 // For TimeoutInErrorHandlingTest.java, we just kill the VM 1161 // and don't take the time to generate a core file. 1162 os::signal_raise(SIGKILL); 1163 } else { 1164 ::abort(); 1165 } 1166 } 1167 1168 // DLL functions 1169 1170 const char* os::dll_file_extension() { return ".so"; } 1171 1172 // This must be hard coded because it's the system's temporary 1173 // directory not the java application's temp directory, ala java.io.tmpdir. 1174 const char* os::get_temp_directory() { return "/tmp"; } 1175 1176 // check if addr is inside libjvm.so 1177 bool os::address_is_in_vm(address addr) { 1178 static address libjvm_base_addr; 1179 Dl_info dlinfo; 1180 1181 if (libjvm_base_addr == NULL) { 1182 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) { 1183 libjvm_base_addr = (address)dlinfo.dli_fbase; 1184 } 1185 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); 1186 } 1187 1188 if (dladdr((void *)addr, &dlinfo) != 0) { 1189 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; 1190 } 1191 1192 return false; 1193 } 1194 1195 typedef int (*dladdr1_func_type)(void *, Dl_info *, void **, int); 1196 static dladdr1_func_type dladdr1_func = NULL; 1197 1198 bool os::dll_address_to_function_name(address addr, char *buf, 1199 int buflen, int * offset, 1200 bool demangle) { 1201 // buf is not optional, but offset is optional 1202 assert(buf != NULL, "sanity check"); 1203 1204 Dl_info dlinfo; 1205 1206 // dladdr1_func was initialized in os::init() 1207 if (dladdr1_func != NULL) { 1208 // yes, we have dladdr1 1209 1210 // Support for dladdr1 is checked at runtime; it may be 1211 // available even if the vm is built on a machine that does 1212 // not have dladdr1 support. Make sure there is a value for 1213 // RTLD_DL_SYMENT. 1214 #ifndef RTLD_DL_SYMENT 1215 #define RTLD_DL_SYMENT 1 1216 #endif 1217 #ifdef _LP64 1218 Elf64_Sym * info; 1219 #else 1220 Elf32_Sym * info; 1221 #endif 1222 if (dladdr1_func((void *)addr, &dlinfo, (void **)&info, 1223 RTLD_DL_SYMENT) != 0) { 1224 // see if we have a matching symbol that covers our address 1225 if (dlinfo.dli_saddr != NULL && 1226 (char *)dlinfo.dli_saddr + info->st_size > (char *)addr) { 1227 if (dlinfo.dli_sname != NULL) { 1228 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) { 1229 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); 1230 } 1231 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1232 return true; 1233 } 1234 } 1235 // no matching symbol so try for just file info 1236 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { 1237 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1238 buf, buflen, offset, dlinfo.dli_fname, demangle)) { 1239 return true; 1240 } 1241 } 1242 } 1243 buf[0] = '\0'; 1244 if (offset != NULL) *offset = -1; 1245 return false; 1246 } 1247 1248 // no, only dladdr is available 1249 if (dladdr((void *)addr, &dlinfo) != 0) { 1250 // see if we have a matching symbol 1251 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) { 1252 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) { 1253 jio_snprintf(buf, buflen, dlinfo.dli_sname); 1254 } 1255 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1256 return true; 1257 } 1258 // no matching symbol so try for just file info 1259 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { 1260 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1261 buf, buflen, offset, dlinfo.dli_fname, demangle)) { 1262 return true; 1263 } 1264 } 1265 } 1266 buf[0] = '\0'; 1267 if (offset != NULL) *offset = -1; 1268 return false; 1269 } 1270 1271 bool os::dll_address_to_library_name(address addr, char* buf, 1272 int buflen, int* offset) { 1273 // buf is not optional, but offset is optional 1274 assert(buf != NULL, "sanity check"); 1275 1276 Dl_info dlinfo; 1277 1278 if (dladdr((void*)addr, &dlinfo) != 0) { 1279 if (dlinfo.dli_fname != NULL) { 1280 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); 1281 } 1282 if (dlinfo.dli_fbase != NULL && offset != NULL) { 1283 *offset = addr - (address)dlinfo.dli_fbase; 1284 } 1285 return true; 1286 } 1287 1288 buf[0] = '\0'; 1289 if (offset) *offset = -1; 1290 return false; 1291 } 1292 1293 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) { 1294 Dl_info dli; 1295 // Sanity check? 1296 if (dladdr(CAST_FROM_FN_PTR(void *, os::get_loaded_modules_info), &dli) == 0 || 1297 dli.dli_fname == NULL) { 1298 return 1; 1299 } 1300 1301 void * handle = dlopen(dli.dli_fname, RTLD_LAZY); 1302 if (handle == NULL) { 1303 return 1; 1304 } 1305 1306 Link_map *map; 1307 dlinfo(handle, RTLD_DI_LINKMAP, &map); 1308 if (map == NULL) { 1309 dlclose(handle); 1310 return 1; 1311 } 1312 1313 while (map->l_prev != NULL) { 1314 map = map->l_prev; 1315 } 1316 1317 while (map != NULL) { 1318 // Iterate through all map entries and call callback with fields of interest 1319 if(callback(map->l_name, (address)map->l_addr, (address)0, param)) { 1320 dlclose(handle); 1321 return 1; 1322 } 1323 map = map->l_next; 1324 } 1325 1326 dlclose(handle); 1327 return 0; 1328 } 1329 1330 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) { 1331 outputStream * out = (outputStream *) param; 1332 out->print_cr(PTR_FORMAT " \t%s", base_address, name); 1333 return 0; 1334 } 1335 1336 void os::print_dll_info(outputStream * st) { 1337 st->print_cr("Dynamic libraries:"); st->flush(); 1338 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) { 1339 st->print_cr("Error: Cannot print dynamic libraries."); 1340 } 1341 } 1342 1343 static void change_endianness(Elf32_Half& val) { 1344 unsigned char *ptr = (unsigned char *)&val; 1345 unsigned char swp = ptr[0]; 1346 ptr[0] = ptr[1]; 1347 ptr[1] = swp; 1348 } 1349 1350 // Loads .dll/.so and 1351 // in case of error it checks if .dll/.so was built for the 1352 // same architecture as Hotspot is running on 1353 1354 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { 1355 log_info(os)("attempting shared library load of %s", filename); 1356 1357 void * result= ::dlopen(filename, RTLD_LAZY); 1358 if (result != NULL) { 1359 // Successful loading 1360 Events::log(NULL, "Loaded shared library %s", filename); 1361 log_info(os)("shared library load of %s was successful", filename); 1362 return result; 1363 } 1364 1365 Elf32_Ehdr elf_head; 1366 const char* error_report = ::dlerror(); 1367 if (error_report == NULL) { 1368 error_report = "dlerror returned no error description"; 1369 } 1370 if (ebuf != NULL && ebuflen > 0) { 1371 ::strncpy(ebuf, error_report, ebuflen-1); 1372 ebuf[ebuflen-1]='\0'; 1373 } 1374 1375 Events::log(NULL, "Loading shared library %s failed, %s", filename, error_report); 1376 log_info(os)("shared library load of %s failed, %s", filename, error_report); 1377 1378 int diag_msg_max_length=ebuflen-strlen(ebuf); 1379 char* diag_msg_buf=ebuf+strlen(ebuf); 1380 1381 if (diag_msg_max_length==0) { 1382 // No more space in ebuf for additional diagnostics message 1383 return NULL; 1384 } 1385 1386 1387 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); 1388 1389 if (file_descriptor < 0) { 1390 // Can't open library, report dlerror() message 1391 return NULL; 1392 } 1393 1394 bool failed_to_read_elf_head= 1395 (sizeof(elf_head)!= 1396 (::read(file_descriptor, &elf_head,sizeof(elf_head)))); 1397 1398 ::close(file_descriptor); 1399 if (failed_to_read_elf_head) { 1400 // file i/o error - report dlerror() msg 1401 return NULL; 1402 } 1403 1404 if (elf_head.e_ident[EI_DATA] != LITTLE_ENDIAN_ONLY(ELFDATA2LSB) BIG_ENDIAN_ONLY(ELFDATA2MSB)) { 1405 // handle invalid/out of range endianness values 1406 if (elf_head.e_ident[EI_DATA] == 0 || elf_head.e_ident[EI_DATA] > 2) { 1407 return NULL; 1408 } 1409 change_endianness(elf_head.e_machine); 1410 } 1411 1412 typedef struct { 1413 Elf32_Half code; // Actual value as defined in elf.h 1414 Elf32_Half compat_class; // Compatibility of archs at VM's sense 1415 unsigned char elf_class; // 32 or 64 bit 1416 unsigned char endianess; // MSB or LSB 1417 char* name; // String representation 1418 } arch_t; 1419 1420 static const arch_t arch_array[]={ 1421 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1422 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1423 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, 1424 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, 1425 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1426 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1427 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, 1428 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, 1429 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, 1430 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"}, 1431 // we only support 64 bit z architecture 1432 {EM_S390, EM_S390, ELFCLASS64, ELFDATA2MSB, (char*)"IBM System/390"}, 1433 {EM_AARCH64, EM_AARCH64, ELFCLASS64, ELFDATA2LSB, (char*)"AARCH64"} 1434 }; 1435 1436 #if (defined IA32) 1437 static Elf32_Half running_arch_code=EM_386; 1438 #elif (defined AMD64) 1439 static Elf32_Half running_arch_code=EM_X86_64; 1440 #elif (defined IA64) 1441 static Elf32_Half running_arch_code=EM_IA_64; 1442 #elif (defined __sparc) && (defined _LP64) 1443 static Elf32_Half running_arch_code=EM_SPARCV9; 1444 #elif (defined __sparc) && (!defined _LP64) 1445 static Elf32_Half running_arch_code=EM_SPARC; 1446 #elif (defined __powerpc64__) 1447 static Elf32_Half running_arch_code=EM_PPC64; 1448 #elif (defined __powerpc__) 1449 static Elf32_Half running_arch_code=EM_PPC; 1450 #elif (defined ARM) 1451 static Elf32_Half running_arch_code=EM_ARM; 1452 #else 1453 #error Method os::dll_load requires that one of following is defined:\ 1454 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, ARM 1455 #endif 1456 1457 // Identify compatibility class for VM's architecture and library's architecture 1458 // Obtain string descriptions for architectures 1459 1460 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; 1461 int running_arch_index=-1; 1462 1463 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) { 1464 if (running_arch_code == arch_array[i].code) { 1465 running_arch_index = i; 1466 } 1467 if (lib_arch.code == arch_array[i].code) { 1468 lib_arch.compat_class = arch_array[i].compat_class; 1469 lib_arch.name = arch_array[i].name; 1470 } 1471 } 1472 1473 assert(running_arch_index != -1, 1474 "Didn't find running architecture code (running_arch_code) in arch_array"); 1475 if (running_arch_index == -1) { 1476 // Even though running architecture detection failed 1477 // we may still continue with reporting dlerror() message 1478 return NULL; 1479 } 1480 1481 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { 1482 if (lib_arch.name != NULL) { 1483 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1484 " (Possible cause: can't load %s .so on a %s platform)", 1485 lib_arch.name, arch_array[running_arch_index].name); 1486 } else { 1487 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1488 " (Possible cause: can't load this .so (machine code=0x%x) on a %s platform)", 1489 lib_arch.code, arch_array[running_arch_index].name); 1490 } 1491 return NULL; 1492 } 1493 1494 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { 1495 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); 1496 return NULL; 1497 } 1498 1499 // ELF file class/capacity : 0 - invalid, 1 - 32bit, 2 - 64bit 1500 if (lib_arch.elf_class > 2 || lib_arch.elf_class < 1) { 1501 ::snprintf(diag_msg_buf, diag_msg_max_length-1, " (Possible cause: invalid ELF file class)"); 1502 return NULL; 1503 } 1504 1505 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { 1506 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1507 " (Possible cause: architecture word width mismatch, can't load %d-bit .so on a %d-bit platform)", 1508 (int) lib_arch.elf_class * 32, arch_array[running_arch_index].elf_class * 32); 1509 return NULL; 1510 } 1511 1512 return NULL; 1513 } 1514 1515 void* os::dll_lookup(void* handle, const char* name) { 1516 return dlsym(handle, name); 1517 } 1518 1519 void* os::get_default_process_handle() { 1520 return (void*)::dlopen(NULL, RTLD_LAZY); 1521 } 1522 1523 static inline time_t get_mtime(const char* filename) { 1524 struct stat st; 1525 int ret = os::stat(filename, &st); 1526 assert(ret == 0, "failed to stat() file '%s': %s", filename, os::strerror(errno)); 1527 return st.st_mtime; 1528 } 1529 1530 int os::compare_file_modified_times(const char* file1, const char* file2) { 1531 time_t t1 = get_mtime(file1); 1532 time_t t2 = get_mtime(file2); 1533 return t1 - t2; 1534 } 1535 1536 static bool _print_ascii_file(const char* filename, outputStream* st) { 1537 int fd = ::open(filename, O_RDONLY); 1538 if (fd == -1) { 1539 return false; 1540 } 1541 1542 char buf[32]; 1543 int bytes; 1544 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { 1545 st->print_raw(buf, bytes); 1546 } 1547 1548 ::close(fd); 1549 1550 return true; 1551 } 1552 1553 void os::print_os_info_brief(outputStream* st) { 1554 os::Solaris::print_distro_info(st); 1555 1556 os::Posix::print_uname_info(st); 1557 1558 os::Solaris::print_libversion_info(st); 1559 } 1560 1561 void os::print_os_info(outputStream* st) { 1562 st->print("OS:"); 1563 1564 os::Solaris::print_distro_info(st); 1565 1566 os::Posix::print_uname_info(st); 1567 1568 os::Posix::print_uptime_info(st); 1569 1570 os::Solaris::print_libversion_info(st); 1571 1572 os::Posix::print_rlimit_info(st); 1573 1574 os::Posix::print_load_average(st); 1575 } 1576 1577 void os::Solaris::print_distro_info(outputStream* st) { 1578 if (!_print_ascii_file("/etc/release", st)) { 1579 st->print("Solaris"); 1580 } 1581 st->cr(); 1582 } 1583 1584 void os::get_summary_os_info(char* buf, size_t buflen) { 1585 strncpy(buf, "Solaris", buflen); // default to plain solaris 1586 FILE* fp = fopen("/etc/release", "r"); 1587 if (fp != NULL) { 1588 char tmp[256]; 1589 // Only get the first line and chop out everything but the os name. 1590 if (fgets(tmp, sizeof(tmp), fp)) { 1591 char* ptr = tmp; 1592 // skip past whitespace characters 1593 while (*ptr != '\0' && (*ptr == ' ' || *ptr == '\t' || *ptr == '\n')) ptr++; 1594 if (*ptr != '\0') { 1595 char* nl = strchr(ptr, '\n'); 1596 if (nl != NULL) *nl = '\0'; 1597 strncpy(buf, ptr, buflen); 1598 } 1599 } 1600 fclose(fp); 1601 } 1602 } 1603 1604 void os::Solaris::print_libversion_info(outputStream* st) { 1605 st->print(" (T2 libthread)"); 1606 st->cr(); 1607 } 1608 1609 static bool check_addr0(outputStream* st) { 1610 jboolean status = false; 1611 const int read_chunk = 200; 1612 int ret = 0; 1613 int nmap = 0; 1614 int fd = ::open("/proc/self/map",O_RDONLY); 1615 if (fd >= 0) { 1616 prmap_t *p = NULL; 1617 char *mbuff = (char *) calloc(read_chunk, sizeof(prmap_t)); 1618 if (NULL == mbuff) { 1619 ::close(fd); 1620 return status; 1621 } 1622 while ((ret = ::read(fd, mbuff, read_chunk*sizeof(prmap_t))) > 0) { 1623 //check if read() has not read partial data 1624 if( 0 != ret % sizeof(prmap_t)){ 1625 break; 1626 } 1627 nmap = ret / sizeof(prmap_t); 1628 p = (prmap_t *)mbuff; 1629 for(int i = 0; i < nmap; i++){ 1630 if (p->pr_vaddr == 0x0) { 1631 st->print("Warning: Address: " PTR_FORMAT ", Size: " SIZE_FORMAT "K, ",p->pr_vaddr, p->pr_size/1024); 1632 st->print("Mapped file: %s, ", p->pr_mapname[0] == '\0' ? "None" : p->pr_mapname); 1633 st->print("Access: "); 1634 st->print("%s",(p->pr_mflags & MA_READ) ? "r" : "-"); 1635 st->print("%s",(p->pr_mflags & MA_WRITE) ? "w" : "-"); 1636 st->print("%s",(p->pr_mflags & MA_EXEC) ? "x" : "-"); 1637 st->cr(); 1638 status = true; 1639 } 1640 p++; 1641 } 1642 } 1643 free(mbuff); 1644 ::close(fd); 1645 } 1646 return status; 1647 } 1648 1649 void os::get_summary_cpu_info(char* buf, size_t buflen) { 1650 // Get MHz with system call. We don't seem to already have this. 1651 processor_info_t stats; 1652 processorid_t id = getcpuid(); 1653 int clock = 0; 1654 if (processor_info(id, &stats) != -1) { 1655 clock = stats.pi_clock; // pi_processor_type isn't more informative than below 1656 } 1657 #ifdef AMD64 1658 snprintf(buf, buflen, "x86 64 bit %d MHz", clock); 1659 #else 1660 // must be sparc 1661 snprintf(buf, buflen, "Sparcv9 64 bit %d MHz", clock); 1662 #endif 1663 } 1664 1665 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) { 1666 // Nothing to do for now. 1667 } 1668 1669 void os::print_memory_info(outputStream* st) { 1670 st->print("Memory:"); 1671 st->print(" %dk page", os::vm_page_size()>>10); 1672 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10); 1673 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10); 1674 st->cr(); 1675 (void) check_addr0(st); 1676 } 1677 1678 // Moved from whole group, because we need them here for diagnostic 1679 // prints. 1680 static int Maxsignum = 0; 1681 static int *ourSigFlags = NULL; 1682 1683 int os::Solaris::get_our_sigflags(int sig) { 1684 assert(ourSigFlags!=NULL, "signal data structure not initialized"); 1685 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range"); 1686 return ourSigFlags[sig]; 1687 } 1688 1689 void os::Solaris::set_our_sigflags(int sig, int flags) { 1690 assert(ourSigFlags!=NULL, "signal data structure not initialized"); 1691 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range"); 1692 ourSigFlags[sig] = flags; 1693 } 1694 1695 1696 static const char* get_signal_handler_name(address handler, 1697 char* buf, int buflen) { 1698 int offset; 1699 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 1700 if (found) { 1701 // skip directory names 1702 const char *p1, *p2; 1703 p1 = buf; 1704 size_t len = strlen(os::file_separator()); 1705 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 1706 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); 1707 } else { 1708 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 1709 } 1710 return buf; 1711 } 1712 1713 static void print_signal_handler(outputStream* st, int sig, 1714 char* buf, size_t buflen) { 1715 struct sigaction sa; 1716 1717 sigaction(sig, NULL, &sa); 1718 1719 st->print("%s: ", os::exception_name(sig, buf, buflen)); 1720 1721 address handler = (sa.sa_flags & SA_SIGINFO) 1722 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 1723 : CAST_FROM_FN_PTR(address, sa.sa_handler); 1724 1725 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 1726 st->print("SIG_DFL"); 1727 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 1728 st->print("SIG_IGN"); 1729 } else { 1730 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 1731 } 1732 1733 st->print(", sa_mask[0]="); 1734 os::Posix::print_signal_set_short(st, &sa.sa_mask); 1735 1736 address rh = VMError::get_resetted_sighandler(sig); 1737 // May be, handler was resetted by VMError? 1738 if (rh != NULL) { 1739 handler = rh; 1740 sa.sa_flags = VMError::get_resetted_sigflags(sig); 1741 } 1742 1743 st->print(", sa_flags="); 1744 os::Posix::print_sa_flags(st, sa.sa_flags); 1745 1746 // Check: is it our handler? 1747 if (handler == CAST_FROM_FN_PTR(address, signalHandler)) { 1748 // It is our signal handler 1749 // check for flags 1750 if (sa.sa_flags != os::Solaris::get_our_sigflags(sig)) { 1751 st->print( 1752 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", 1753 os::Solaris::get_our_sigflags(sig)); 1754 } 1755 } 1756 st->cr(); 1757 } 1758 1759 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1760 st->print_cr("Signal Handlers:"); 1761 print_signal_handler(st, SIGSEGV, buf, buflen); 1762 print_signal_handler(st, SIGBUS , buf, buflen); 1763 print_signal_handler(st, SIGFPE , buf, buflen); 1764 print_signal_handler(st, SIGPIPE, buf, buflen); 1765 print_signal_handler(st, SIGXFSZ, buf, buflen); 1766 print_signal_handler(st, SIGILL , buf, buflen); 1767 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen); 1768 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); 1769 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen); 1770 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); 1771 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen); 1772 } 1773 1774 static char saved_jvm_path[MAXPATHLEN] = { 0 }; 1775 1776 // Find the full path to the current module, libjvm.so 1777 void os::jvm_path(char *buf, jint buflen) { 1778 // Error checking. 1779 if (buflen < MAXPATHLEN) { 1780 assert(false, "must use a large-enough buffer"); 1781 buf[0] = '\0'; 1782 return; 1783 } 1784 // Lazy resolve the path to current module. 1785 if (saved_jvm_path[0] != 0) { 1786 strcpy(buf, saved_jvm_path); 1787 return; 1788 } 1789 1790 Dl_info dlinfo; 1791 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo); 1792 assert(ret != 0, "cannot locate libjvm"); 1793 if (ret != 0 && dlinfo.dli_fname != NULL) { 1794 if (os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen) == NULL) { 1795 return; 1796 } 1797 } else { 1798 buf[0] = '\0'; 1799 return; 1800 } 1801 1802 if (Arguments::sun_java_launcher_is_altjvm()) { 1803 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical 1804 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so". 1805 // If "/jre/lib/" appears at the right place in the string, then 1806 // assume we are installed in a JDK and we're done. Otherwise, check 1807 // for a JAVA_HOME environment variable and fix up the path so it 1808 // looks like libjvm.so is installed there (append a fake suffix 1809 // hotspot/libjvm.so). 1810 const char *p = buf + strlen(buf) - 1; 1811 for (int count = 0; p > buf && count < 5; ++count) { 1812 for (--p; p > buf && *p != '/'; --p) 1813 /* empty */ ; 1814 } 1815 1816 if (strncmp(p, "/jre/lib/", 9) != 0) { 1817 // Look for JAVA_HOME in the environment. 1818 char* java_home_var = ::getenv("JAVA_HOME"); 1819 if (java_home_var != NULL && java_home_var[0] != 0) { 1820 char* jrelib_p; 1821 int len; 1822 1823 // Check the current module name "libjvm.so". 1824 p = strrchr(buf, '/'); 1825 assert(strstr(p, "/libjvm") == p, "invalid library name"); 1826 1827 if (os::Posix::realpath(java_home_var, buf, buflen) == NULL) { 1828 return; 1829 } 1830 // determine if this is a legacy image or modules image 1831 // modules image doesn't have "jre" subdirectory 1832 len = strlen(buf); 1833 assert(len < buflen, "Ran out of buffer space"); 1834 jrelib_p = buf + len; 1835 snprintf(jrelib_p, buflen-len, "/jre/lib"); 1836 if (0 != access(buf, F_OK)) { 1837 snprintf(jrelib_p, buflen-len, "/lib"); 1838 } 1839 1840 if (0 == access(buf, F_OK)) { 1841 // Use current module name "libjvm.so" 1842 len = strlen(buf); 1843 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so"); 1844 } else { 1845 // Go back to path of .so 1846 if (os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen) == NULL) { 1847 return; 1848 } 1849 } 1850 } 1851 } 1852 } 1853 1854 strncpy(saved_jvm_path, buf, MAXPATHLEN); 1855 saved_jvm_path[MAXPATHLEN - 1] = '\0'; 1856 } 1857 1858 1859 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1860 // no prefix required, not even "_" 1861 } 1862 1863 1864 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1865 // no suffix required 1866 } 1867 1868 // sun.misc.Signal 1869 1870 extern "C" { 1871 static void UserHandler(int sig, void *siginfo, void *context) { 1872 // Ctrl-C is pressed during error reporting, likely because the error 1873 // handler fails to abort. Let VM die immediately. 1874 if (sig == SIGINT && VMError::is_error_reported()) { 1875 os::die(); 1876 } 1877 1878 os::signal_notify(sig); 1879 // We do not need to reinstate the signal handler each time... 1880 } 1881 } 1882 1883 void* os::user_handler() { 1884 return CAST_FROM_FN_PTR(void*, UserHandler); 1885 } 1886 1887 extern "C" { 1888 typedef void (*sa_handler_t)(int); 1889 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); 1890 } 1891 1892 void* os::signal(int signal_number, void* handler) { 1893 struct sigaction sigAct, oldSigAct; 1894 sigfillset(&(sigAct.sa_mask)); 1895 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND; 1896 sigAct.sa_flags |= SA_SIGINFO; 1897 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); 1898 1899 if (sigaction(signal_number, &sigAct, &oldSigAct)) { 1900 // -1 means registration failed 1901 return (void *)-1; 1902 } 1903 1904 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); 1905 } 1906 1907 void os::signal_raise(int signal_number) { 1908 raise(signal_number); 1909 } 1910 1911 // The following code is moved from os.cpp for making this 1912 // code platform specific, which it is by its very nature. 1913 1914 // a counter for each possible signal value 1915 static int Sigexit = 0; 1916 static jint *pending_signals = NULL; 1917 static int *preinstalled_sigs = NULL; 1918 static struct sigaction *chainedsigactions = NULL; 1919 static Semaphore* sig_sem = NULL; 1920 1921 int os::sigexitnum_pd() { 1922 assert(Sigexit > 0, "signal memory not yet initialized"); 1923 return Sigexit; 1924 } 1925 1926 void os::Solaris::init_signal_mem() { 1927 // Initialize signal structures 1928 Maxsignum = SIGRTMAX; 1929 Sigexit = Maxsignum+1; 1930 assert(Maxsignum >0, "Unable to obtain max signal number"); 1931 1932 // Initialize signal structures 1933 // pending_signals has one int per signal 1934 // The additional signal is for SIGEXIT - exit signal to signal_thread 1935 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal); 1936 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1))); 1937 1938 if (UseSignalChaining) { 1939 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction) 1940 * (Maxsignum + 1), mtInternal); 1941 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1))); 1942 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1), mtInternal); 1943 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1))); 1944 } 1945 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1), mtInternal); 1946 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1)); 1947 } 1948 1949 static void jdk_misc_signal_init() { 1950 // Initialize signal semaphore 1951 sig_sem = new Semaphore(); 1952 } 1953 1954 void os::signal_notify(int sig) { 1955 if (sig_sem != NULL) { 1956 Atomic::inc(&pending_signals[sig]); 1957 sig_sem->signal(); 1958 } else { 1959 // Signal thread is not created with ReduceSignalUsage and jdk_misc_signal_init 1960 // initialization isn't called. 1961 assert(ReduceSignalUsage, "signal semaphore should be created"); 1962 } 1963 } 1964 1965 static int check_pending_signals() { 1966 int ret; 1967 while (true) { 1968 for (int i = 0; i < Sigexit + 1; i++) { 1969 jint n = pending_signals[i]; 1970 if (n > 0 && n == Atomic::cmpxchg(&pending_signals[i], n, n - 1)) { 1971 return i; 1972 } 1973 } 1974 JavaThread *thread = JavaThread::current(); 1975 ThreadBlockInVM tbivm(thread); 1976 1977 bool threadIsSuspended; 1978 do { 1979 thread->set_suspend_equivalent(); 1980 sig_sem->wait(); 1981 1982 // were we externally suspended while we were waiting? 1983 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 1984 if (threadIsSuspended) { 1985 // The semaphore has been incremented, but while we were waiting 1986 // another thread suspended us. We don't want to continue running 1987 // while suspended because that would surprise the thread that 1988 // suspended us. 1989 sig_sem->signal(); 1990 1991 thread->java_suspend_self(); 1992 } 1993 } while (threadIsSuspended); 1994 } 1995 } 1996 1997 int os::signal_wait() { 1998 return check_pending_signals(); 1999 } 2000 2001 //////////////////////////////////////////////////////////////////////////////// 2002 // Virtual Memory 2003 2004 static int page_size = -1; 2005 2006 int os::vm_page_size() { 2007 assert(page_size != -1, "must call os::init"); 2008 return page_size; 2009 } 2010 2011 // Solaris allocates memory by pages. 2012 int os::vm_allocation_granularity() { 2013 assert(page_size != -1, "must call os::init"); 2014 return page_size; 2015 } 2016 2017 static bool recoverable_mmap_error(int err) { 2018 // See if the error is one we can let the caller handle. This 2019 // list of errno values comes from the Solaris mmap(2) man page. 2020 switch (err) { 2021 case EBADF: 2022 case EINVAL: 2023 case ENOTSUP: 2024 // let the caller deal with these errors 2025 return true; 2026 2027 default: 2028 // Any remaining errors on this OS can cause our reserved mapping 2029 // to be lost. That can cause confusion where different data 2030 // structures think they have the same memory mapped. The worst 2031 // scenario is if both the VM and a library think they have the 2032 // same memory mapped. 2033 return false; 2034 } 2035 } 2036 2037 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec, 2038 int err) { 2039 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 2040 ", %d) failed; error='%s' (errno=%d)", addr, bytes, exec, 2041 os::strerror(err), err); 2042 } 2043 2044 static void warn_fail_commit_memory(char* addr, size_t bytes, 2045 size_t alignment_hint, bool exec, 2046 int err) { 2047 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 2048 ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, bytes, 2049 alignment_hint, exec, os::strerror(err), err); 2050 } 2051 2052 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, bool exec) { 2053 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; 2054 size_t size = bytes; 2055 char *res = Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot); 2056 if (res != NULL) { 2057 if (UseNUMAInterleaving) { 2058 numa_make_global(addr, bytes); 2059 } 2060 return 0; 2061 } 2062 2063 int err = errno; // save errno from mmap() call in mmap_chunk() 2064 2065 if (!recoverable_mmap_error(err)) { 2066 warn_fail_commit_memory(addr, bytes, exec, err); 2067 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "committing reserved memory."); 2068 } 2069 2070 return err; 2071 } 2072 2073 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) { 2074 return Solaris::commit_memory_impl(addr, bytes, exec) == 0; 2075 } 2076 2077 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, bool exec, 2078 const char* mesg) { 2079 assert(mesg != NULL, "mesg must be specified"); 2080 int err = os::Solaris::commit_memory_impl(addr, bytes, exec); 2081 if (err != 0) { 2082 // the caller wants all commit errors to exit with the specified mesg: 2083 warn_fail_commit_memory(addr, bytes, exec, err); 2084 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg); 2085 } 2086 } 2087 2088 size_t os::Solaris::page_size_for_alignment(size_t alignment) { 2089 assert(is_aligned(alignment, (size_t) vm_page_size()), 2090 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, 2091 alignment, (size_t) vm_page_size()); 2092 2093 for (int i = 0; _page_sizes[i] != 0; i++) { 2094 if (is_aligned(alignment, _page_sizes[i])) { 2095 return _page_sizes[i]; 2096 } 2097 } 2098 2099 return (size_t) vm_page_size(); 2100 } 2101 2102 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, 2103 size_t alignment_hint, bool exec) { 2104 int err = Solaris::commit_memory_impl(addr, bytes, exec); 2105 if (err == 0 && UseLargePages && alignment_hint > 0) { 2106 assert(is_aligned(bytes, alignment_hint), 2107 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, alignment_hint); 2108 2109 // The syscall memcntl requires an exact page size (see man memcntl for details). 2110 size_t page_size = page_size_for_alignment(alignment_hint); 2111 if (page_size > (size_t) vm_page_size()) { 2112 (void)Solaris::setup_large_pages(addr, bytes, page_size); 2113 } 2114 } 2115 return err; 2116 } 2117 2118 bool os::pd_commit_memory(char* addr, size_t bytes, size_t alignment_hint, 2119 bool exec) { 2120 return Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec) == 0; 2121 } 2122 2123 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, 2124 size_t alignment_hint, bool exec, 2125 const char* mesg) { 2126 assert(mesg != NULL, "mesg must be specified"); 2127 int err = os::Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec); 2128 if (err != 0) { 2129 // the caller wants all commit errors to exit with the specified mesg: 2130 warn_fail_commit_memory(addr, bytes, alignment_hint, exec, err); 2131 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg); 2132 } 2133 } 2134 2135 // Uncommit the pages in a specified region. 2136 void os::pd_free_memory(char* addr, size_t bytes, size_t alignment_hint) { 2137 if (madvise(addr, bytes, MADV_FREE) < 0) { 2138 debug_only(warning("MADV_FREE failed.")); 2139 return; 2140 } 2141 } 2142 2143 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 2144 return os::commit_memory(addr, size, !ExecMem); 2145 } 2146 2147 bool os::remove_stack_guard_pages(char* addr, size_t size) { 2148 return os::uncommit_memory(addr, size); 2149 } 2150 2151 // Change the page size in a given range. 2152 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 2153 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned."); 2154 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned."); 2155 if (UseLargePages) { 2156 size_t page_size = Solaris::page_size_for_alignment(alignment_hint); 2157 if (page_size > (size_t) vm_page_size()) { 2158 Solaris::setup_large_pages(addr, bytes, page_size); 2159 } 2160 } 2161 } 2162 2163 // Tell the OS to make the range local to the first-touching LWP 2164 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { 2165 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned."); 2166 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) { 2167 debug_only(warning("MADV_ACCESS_LWP failed.")); 2168 } 2169 } 2170 2171 // Tell the OS that this range would be accessed from different LWPs. 2172 void os::numa_make_global(char *addr, size_t bytes) { 2173 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned."); 2174 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) { 2175 debug_only(warning("MADV_ACCESS_MANY failed.")); 2176 } 2177 } 2178 2179 // Get the number of the locality groups. 2180 size_t os::numa_get_groups_num() { 2181 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie()); 2182 return n != -1 ? n : 1; 2183 } 2184 2185 // Get a list of leaf locality groups. A leaf lgroup is group that 2186 // doesn't have any children. Typical leaf group is a CPU or a CPU/memory 2187 // board. An LWP is assigned to one of these groups upon creation. 2188 size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2189 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) { 2190 ids[0] = 0; 2191 return 1; 2192 } 2193 int result_size = 0, top = 1, bottom = 0, cur = 0; 2194 for (int k = 0; k < size; k++) { 2195 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur], 2196 (Solaris::lgrp_id_t*)&ids[top], size - top); 2197 if (r == -1) { 2198 ids[0] = 0; 2199 return 1; 2200 } 2201 if (!r) { 2202 // That's a leaf node. 2203 assert(bottom <= cur, "Sanity check"); 2204 // Check if the node has memory 2205 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur], 2206 NULL, 0, LGRP_RSRC_MEM) > 0) { 2207 ids[bottom++] = ids[cur]; 2208 } 2209 } 2210 top += r; 2211 cur++; 2212 } 2213 if (bottom == 0) { 2214 // Handle a situation, when the OS reports no memory available. 2215 // Assume UMA architecture. 2216 ids[0] = 0; 2217 return 1; 2218 } 2219 return bottom; 2220 } 2221 2222 // Detect the topology change. Typically happens during CPU plugging-unplugging. 2223 bool os::numa_topology_changed() { 2224 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie()); 2225 if (is_stale != -1 && is_stale) { 2226 Solaris::lgrp_fini(Solaris::lgrp_cookie()); 2227 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER); 2228 assert(c != 0, "Failure to initialize LGRP API"); 2229 Solaris::set_lgrp_cookie(c); 2230 return true; 2231 } 2232 return false; 2233 } 2234 2235 // Get the group id of the current LWP. 2236 int os::numa_get_group_id() { 2237 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID); 2238 if (lgrp_id == -1) { 2239 return 0; 2240 } 2241 const int size = os::numa_get_groups_num(); 2242 int *ids = (int*)alloca(size * sizeof(int)); 2243 2244 // Get the ids of all lgroups with memory; r is the count. 2245 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id, 2246 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM); 2247 if (r <= 0) { 2248 return 0; 2249 } 2250 return ids[os::random() % r]; 2251 } 2252 2253 int os::numa_get_group_id_for_address(const void* address) { 2254 return 0; 2255 } 2256 2257 // Request information about the page. 2258 bool os::get_page_info(char *start, page_info* info) { 2259 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE }; 2260 uint64_t addr = (uintptr_t)start; 2261 uint64_t outdata[2]; 2262 uint_t validity = 0; 2263 2264 if (meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) { 2265 return false; 2266 } 2267 2268 info->size = 0; 2269 info->lgrp_id = -1; 2270 2271 if ((validity & 1) != 0) { 2272 if ((validity & 2) != 0) { 2273 info->lgrp_id = outdata[0]; 2274 } 2275 if ((validity & 4) != 0) { 2276 info->size = outdata[1]; 2277 } 2278 return true; 2279 } 2280 return false; 2281 } 2282 2283 // Scan the pages from start to end until a page different than 2284 // the one described in the info parameter is encountered. 2285 char *os::scan_pages(char *start, char* end, page_info* page_expected, 2286 page_info* page_found) { 2287 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE }; 2288 const size_t types = sizeof(info_types) / sizeof(info_types[0]); 2289 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT + 1]; 2290 uint_t validity[MAX_MEMINFO_CNT]; 2291 2292 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size); 2293 uint64_t p = (uint64_t)start; 2294 while (p < (uint64_t)end) { 2295 addrs[0] = p; 2296 size_t addrs_count = 1; 2297 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] + page_size < (uint64_t)end) { 2298 addrs[addrs_count] = addrs[addrs_count - 1] + page_size; 2299 addrs_count++; 2300 } 2301 2302 if (meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) { 2303 return NULL; 2304 } 2305 2306 size_t i = 0; 2307 for (; i < addrs_count; i++) { 2308 if ((validity[i] & 1) != 0) { 2309 if ((validity[i] & 4) != 0) { 2310 if (outdata[types * i + 1] != page_expected->size) { 2311 break; 2312 } 2313 } else if (page_expected->size != 0) { 2314 break; 2315 } 2316 2317 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) { 2318 if (outdata[types * i] != page_expected->lgrp_id) { 2319 break; 2320 } 2321 } 2322 } else { 2323 return NULL; 2324 } 2325 } 2326 2327 if (i < addrs_count) { 2328 if ((validity[i] & 2) != 0) { 2329 page_found->lgrp_id = outdata[types * i]; 2330 } else { 2331 page_found->lgrp_id = -1; 2332 } 2333 if ((validity[i] & 4) != 0) { 2334 page_found->size = outdata[types * i + 1]; 2335 } else { 2336 page_found->size = 0; 2337 } 2338 return (char*)addrs[i]; 2339 } 2340 2341 p = addrs[addrs_count - 1] + page_size; 2342 } 2343 return end; 2344 } 2345 2346 bool os::pd_uncommit_memory(char* addr, size_t bytes) { 2347 size_t size = bytes; 2348 // Map uncommitted pages PROT_NONE so we fail early if we touch an 2349 // uncommitted page. Otherwise, the read/write might succeed if we 2350 // have enough swap space to back the physical page. 2351 return 2352 NULL != Solaris::mmap_chunk(addr, size, 2353 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, 2354 PROT_NONE); 2355 } 2356 2357 char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) { 2358 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0); 2359 2360 if (b == MAP_FAILED) { 2361 return NULL; 2362 } 2363 return b; 2364 } 2365 2366 char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes, 2367 size_t alignment_hint, bool fixed) { 2368 char* addr = requested_addr; 2369 int flags = MAP_PRIVATE | MAP_NORESERVE; 2370 2371 assert(!(fixed && (alignment_hint > 0)), 2372 "alignment hint meaningless with fixed mmap"); 2373 2374 if (fixed) { 2375 flags |= MAP_FIXED; 2376 } else if (alignment_hint > (size_t) vm_page_size()) { 2377 flags |= MAP_ALIGN; 2378 addr = (char*) alignment_hint; 2379 } 2380 2381 // Map uncommitted pages PROT_NONE so we fail early if we touch an 2382 // uncommitted page. Otherwise, the read/write might succeed if we 2383 // have enough swap space to back the physical page. 2384 return mmap_chunk(addr, bytes, flags, PROT_NONE); 2385 } 2386 2387 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, 2388 size_t alignment_hint) { 2389 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint, 2390 (requested_addr != NULL)); 2391 2392 guarantee(requested_addr == NULL || requested_addr == addr, 2393 "OS failed to return requested mmap address."); 2394 return addr; 2395 } 2396 2397 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) { 2398 assert(file_desc >= 0, "file_desc is not valid"); 2399 char* result = pd_attempt_reserve_memory_at(bytes, requested_addr); 2400 if (result != NULL) { 2401 if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) { 2402 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory")); 2403 } 2404 } 2405 return result; 2406 } 2407 2408 // Reserve memory at an arbitrary address, only if that area is 2409 // available (and not reserved for something else). 2410 2411 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2412 // Assert only that the size is a multiple of the page size, since 2413 // that's all that mmap requires, and since that's all we really know 2414 // about at this low abstraction level. If we need higher alignment, 2415 // we can either pass an alignment to this method or verify alignment 2416 // in one of the methods further up the call chain. See bug 5044738. 2417 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); 2418 2419 // Since snv_84, Solaris attempts to honor the address hint - see 5003415. 2420 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false); 2421 2422 volatile int err = errno; 2423 if (addr == requested_addr) { 2424 return addr; 2425 } 2426 2427 if (addr != NULL) { 2428 pd_unmap_memory(addr, bytes); 2429 } 2430 2431 return NULL; 2432 } 2433 2434 bool os::pd_release_memory(char* addr, size_t bytes) { 2435 size_t size = bytes; 2436 return munmap(addr, size) == 0; 2437 } 2438 2439 static bool solaris_mprotect(char* addr, size_t bytes, int prot) { 2440 assert(addr == (char*)align_down((uintptr_t)addr, os::vm_page_size()), 2441 "addr must be page aligned"); 2442 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with protection modes %x", p2i(addr), p2i(addr+bytes), prot); 2443 int retVal = mprotect(addr, bytes, prot); 2444 return retVal == 0; 2445 } 2446 2447 // Protect memory (Used to pass readonly pages through 2448 // JNI GetArray<type>Elements with empty arrays.) 2449 // Also, used for serialization page and for compressed oops null pointer 2450 // checking. 2451 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 2452 bool is_committed) { 2453 unsigned int p = 0; 2454 switch (prot) { 2455 case MEM_PROT_NONE: p = PROT_NONE; break; 2456 case MEM_PROT_READ: p = PROT_READ; break; 2457 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; 2458 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; 2459 default: 2460 ShouldNotReachHere(); 2461 } 2462 // is_committed is unused. 2463 return solaris_mprotect(addr, bytes, p); 2464 } 2465 2466 // guard_memory and unguard_memory only happens within stack guard pages. 2467 // Since ISM pertains only to the heap, guard and unguard memory should not 2468 /// happen with an ISM region. 2469 bool os::guard_memory(char* addr, size_t bytes) { 2470 return solaris_mprotect(addr, bytes, PROT_NONE); 2471 } 2472 2473 bool os::unguard_memory(char* addr, size_t bytes) { 2474 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE); 2475 } 2476 2477 // Large page support 2478 static size_t _large_page_size = 0; 2479 2480 // Insertion sort for small arrays (descending order). 2481 static void insertion_sort_descending(size_t* array, int len) { 2482 for (int i = 0; i < len; i++) { 2483 size_t val = array[i]; 2484 for (size_t key = i; key > 0 && array[key - 1] < val; --key) { 2485 size_t tmp = array[key]; 2486 array[key] = array[key - 1]; 2487 array[key - 1] = tmp; 2488 } 2489 } 2490 } 2491 2492 bool os::Solaris::mpss_sanity_check(bool warn, size_t* page_size) { 2493 const unsigned int usable_count = VM_Version::page_size_count(); 2494 if (usable_count == 1) { 2495 return false; 2496 } 2497 2498 // Find the right getpagesizes interface. When solaris 11 is the minimum 2499 // build platform, getpagesizes() (without the '2') can be called directly. 2500 typedef int (*gps_t)(size_t[], int); 2501 gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2")); 2502 if (gps_func == NULL) { 2503 gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes")); 2504 if (gps_func == NULL) { 2505 if (warn) { 2506 warning("MPSS is not supported by the operating system."); 2507 } 2508 return false; 2509 } 2510 } 2511 2512 // Fill the array of page sizes. 2513 int n = (*gps_func)(_page_sizes, page_sizes_max); 2514 assert(n > 0, "Solaris bug?"); 2515 2516 if (n == page_sizes_max) { 2517 // Add a sentinel value (necessary only if the array was completely filled 2518 // since it is static (zeroed at initialization)). 2519 _page_sizes[--n] = 0; 2520 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");) 2521 } 2522 assert(_page_sizes[n] == 0, "missing sentinel"); 2523 trace_page_sizes("available page sizes", _page_sizes, n); 2524 2525 if (n == 1) return false; // Only one page size available. 2526 2527 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and 2528 // select up to usable_count elements. First sort the array, find the first 2529 // acceptable value, then copy the usable sizes to the top of the array and 2530 // trim the rest. Make sure to include the default page size :-). 2531 // 2532 // A better policy could get rid of the 4M limit by taking the sizes of the 2533 // important VM memory regions (java heap and possibly the code cache) into 2534 // account. 2535 insertion_sort_descending(_page_sizes, n); 2536 const size_t size_limit = 2537 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes; 2538 int beg; 2539 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */; 2540 const int end = MIN2((int)usable_count, n) - 1; 2541 for (int cur = 0; cur < end; ++cur, ++beg) { 2542 _page_sizes[cur] = _page_sizes[beg]; 2543 } 2544 _page_sizes[end] = vm_page_size(); 2545 _page_sizes[end + 1] = 0; 2546 2547 if (_page_sizes[end] > _page_sizes[end - 1]) { 2548 // Default page size is not the smallest; sort again. 2549 insertion_sort_descending(_page_sizes, end + 1); 2550 } 2551 *page_size = _page_sizes[0]; 2552 2553 trace_page_sizes("usable page sizes", _page_sizes, end + 1); 2554 return true; 2555 } 2556 2557 void os::large_page_init() { 2558 if (UseLargePages) { 2559 // print a warning if any large page related flag is specified on command line 2560 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || 2561 !FLAG_IS_DEFAULT(LargePageSizeInBytes); 2562 2563 UseLargePages = Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size); 2564 } 2565 } 2566 2567 bool os::Solaris::is_valid_page_size(size_t bytes) { 2568 for (int i = 0; _page_sizes[i] != 0; i++) { 2569 if (_page_sizes[i] == bytes) { 2570 return true; 2571 } 2572 } 2573 return false; 2574 } 2575 2576 bool os::Solaris::setup_large_pages(caddr_t start, size_t bytes, size_t align) { 2577 assert(is_valid_page_size(align), SIZE_FORMAT " is not a valid page size", align); 2578 assert(is_aligned((void*) start, align), 2579 PTR_FORMAT " is not aligned to " SIZE_FORMAT, p2i((void*) start), align); 2580 assert(is_aligned(bytes, align), 2581 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, align); 2582 2583 // Signal to OS that we want large pages for addresses 2584 // from addr, addr + bytes 2585 struct memcntl_mha mpss_struct; 2586 mpss_struct.mha_cmd = MHA_MAPSIZE_VA; 2587 mpss_struct.mha_pagesize = align; 2588 mpss_struct.mha_flags = 0; 2589 // Upon successful completion, memcntl() returns 0 2590 if (memcntl(start, bytes, MC_HAT_ADVISE, (caddr_t) &mpss_struct, 0, 0)) { 2591 debug_only(warning("Attempt to use MPSS failed.")); 2592 return false; 2593 } 2594 return true; 2595 } 2596 2597 char* os::pd_reserve_memory_special(size_t size, size_t alignment, char* addr, bool exec) { 2598 fatal("os::reserve_memory_special should not be called on Solaris."); 2599 return NULL; 2600 } 2601 2602 bool os::pd_release_memory_special(char* base, size_t bytes) { 2603 fatal("os::release_memory_special should not be called on Solaris."); 2604 return false; 2605 } 2606 2607 size_t os::large_page_size() { 2608 return _large_page_size; 2609 } 2610 2611 // MPSS allows application to commit large page memory on demand; with ISM 2612 // the entire memory region must be allocated as shared memory. 2613 bool os::can_commit_large_page_memory() { 2614 return true; 2615 } 2616 2617 bool os::can_execute_large_page_memory() { 2618 return true; 2619 } 2620 2621 // Sleep forever; naked call to OS-specific sleep; use with CAUTION 2622 void os::infinite_sleep() { 2623 while (true) { // sleep forever ... 2624 ::sleep(100); // ... 100 seconds at a time 2625 } 2626 } 2627 2628 // Used to convert frequent JVM_Yield() to nops 2629 bool os::dont_yield() { 2630 if (DontYieldALot) { 2631 static hrtime_t last_time = 0; 2632 hrtime_t diff = getTimeNanos() - last_time; 2633 2634 if (diff < DontYieldALotInterval * 1000000) { 2635 return true; 2636 } 2637 2638 last_time += diff; 2639 2640 return false; 2641 } else { 2642 return false; 2643 } 2644 } 2645 2646 // Note that yield semantics are defined by the scheduling class to which 2647 // the thread currently belongs. Typically, yield will _not yield to 2648 // other equal or higher priority threads that reside on the dispatch queues 2649 // of other CPUs. 2650 2651 void os::naked_yield() { 2652 thr_yield(); 2653 } 2654 2655 // Interface for setting lwp priorities. We are using T2 libthread, 2656 // which forces the use of bound threads, so all of our threads will 2657 // be assigned to real lwp's. Using the thr_setprio function is 2658 // meaningless in this mode so we must adjust the real lwp's priority. 2659 // The routines below implement the getting and setting of lwp priorities. 2660 // 2661 // Note: There are three priority scales used on Solaris. Java priotities 2662 // which range from 1 to 10, libthread "thr_setprio" scale which range 2663 // from 0 to 127, and the current scheduling class of the process we 2664 // are running in. This is typically from -60 to +60. 2665 // The setting of the lwp priorities in done after a call to thr_setprio 2666 // so Java priorities are mapped to libthread priorities and we map from 2667 // the latter to lwp priorities. We don't keep priorities stored in 2668 // Java priorities since some of our worker threads want to set priorities 2669 // higher than all Java threads. 2670 // 2671 // For related information: 2672 // (1) man -s 2 priocntl 2673 // (2) man -s 4 priocntl 2674 // (3) man dispadmin 2675 // = librt.so 2676 // = libthread/common/rtsched.c - thrp_setlwpprio(). 2677 // = ps -cL <pid> ... to validate priority. 2678 // = sched_get_priority_min and _max 2679 // pthread_create 2680 // sched_setparam 2681 // pthread_setschedparam 2682 // 2683 // Assumptions: 2684 // + We assume that all threads in the process belong to the same 2685 // scheduling class. IE. an homogenous process. 2686 // + Must be root or in IA group to change change "interactive" attribute. 2687 // Priocntl() will fail silently. The only indication of failure is when 2688 // we read-back the value and notice that it hasn't changed. 2689 // + Interactive threads enter the runq at the head, non-interactive at the tail. 2690 // + For RT, change timeslice as well. Invariant: 2691 // constant "priority integral" 2692 // Konst == TimeSlice * (60-Priority) 2693 // Given a priority, compute appropriate timeslice. 2694 // + Higher numerical values have higher priority. 2695 2696 // sched class attributes 2697 typedef struct { 2698 int schedPolicy; // classID 2699 int maxPrio; 2700 int minPrio; 2701 } SchedInfo; 2702 2703 2704 static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits; 2705 2706 #ifdef ASSERT 2707 static int ReadBackValidate = 1; 2708 #endif 2709 static int myClass = 0; 2710 static int myMin = 0; 2711 static int myMax = 0; 2712 static int myCur = 0; 2713 static bool priocntl_enable = false; 2714 2715 static const int criticalPrio = FXCriticalPriority; 2716 static int java_MaxPriority_to_os_priority = 0; // Saved mapping 2717 2718 2719 // lwp_priocntl_init 2720 // 2721 // Try to determine the priority scale for our process. 2722 // 2723 // Return errno or 0 if OK. 2724 // 2725 static int lwp_priocntl_init() { 2726 int rslt; 2727 pcinfo_t ClassInfo; 2728 pcparms_t ParmInfo; 2729 int i; 2730 2731 if (!UseThreadPriorities) return 0; 2732 2733 // If ThreadPriorityPolicy is 1, switch tables 2734 if (ThreadPriorityPolicy == 1) { 2735 for (i = 0; i < CriticalPriority+1; i++) 2736 os::java_to_os_priority[i] = prio_policy1[i]; 2737 } 2738 if (UseCriticalJavaThreadPriority) { 2739 // MaxPriority always maps to the FX scheduling class and criticalPrio. 2740 // See set_native_priority() and set_lwp_class_and_priority(). 2741 // Save original MaxPriority mapping in case attempt to 2742 // use critical priority fails. 2743 java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority]; 2744 // Set negative to distinguish from other priorities 2745 os::java_to_os_priority[MaxPriority] = -criticalPrio; 2746 } 2747 2748 // Get IDs for a set of well-known scheduling classes. 2749 // TODO-FIXME: GETCLINFO returns the current # of classes in the 2750 // the system. We should have a loop that iterates over the 2751 // classID values, which are known to be "small" integers. 2752 2753 strcpy(ClassInfo.pc_clname, "TS"); 2754 ClassInfo.pc_cid = -1; 2755 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 2756 if (rslt < 0) return errno; 2757 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1"); 2758 tsLimits.schedPolicy = ClassInfo.pc_cid; 2759 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri; 2760 tsLimits.minPrio = -tsLimits.maxPrio; 2761 2762 strcpy(ClassInfo.pc_clname, "IA"); 2763 ClassInfo.pc_cid = -1; 2764 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 2765 if (rslt < 0) return errno; 2766 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1"); 2767 iaLimits.schedPolicy = ClassInfo.pc_cid; 2768 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri; 2769 iaLimits.minPrio = -iaLimits.maxPrio; 2770 2771 strcpy(ClassInfo.pc_clname, "RT"); 2772 ClassInfo.pc_cid = -1; 2773 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 2774 if (rslt < 0) return errno; 2775 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1"); 2776 rtLimits.schedPolicy = ClassInfo.pc_cid; 2777 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri; 2778 rtLimits.minPrio = 0; 2779 2780 strcpy(ClassInfo.pc_clname, "FX"); 2781 ClassInfo.pc_cid = -1; 2782 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 2783 if (rslt < 0) return errno; 2784 assert(ClassInfo.pc_cid != -1, "cid for FX class is -1"); 2785 fxLimits.schedPolicy = ClassInfo.pc_cid; 2786 fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri; 2787 fxLimits.minPrio = 0; 2788 2789 // Query our "current" scheduling class. 2790 // This will normally be IA, TS or, rarely, FX or RT. 2791 memset(&ParmInfo, 0, sizeof(ParmInfo)); 2792 ParmInfo.pc_cid = PC_CLNULL; 2793 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo); 2794 if (rslt < 0) return errno; 2795 myClass = ParmInfo.pc_cid; 2796 2797 // We now know our scheduling classId, get specific information 2798 // about the class. 2799 ClassInfo.pc_cid = myClass; 2800 ClassInfo.pc_clname[0] = 0; 2801 rslt = priocntl((idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo); 2802 if (rslt < 0) return errno; 2803 2804 if (ThreadPriorityVerbose) { 2805 tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname); 2806 } 2807 2808 memset(&ParmInfo, 0, sizeof(pcparms_t)); 2809 ParmInfo.pc_cid = PC_CLNULL; 2810 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo); 2811 if (rslt < 0) return errno; 2812 2813 if (ParmInfo.pc_cid == rtLimits.schedPolicy) { 2814 myMin = rtLimits.minPrio; 2815 myMax = rtLimits.maxPrio; 2816 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { 2817 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms; 2818 myMin = iaLimits.minPrio; 2819 myMax = iaLimits.maxPrio; 2820 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict 2821 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { 2822 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms; 2823 myMin = tsLimits.minPrio; 2824 myMax = tsLimits.maxPrio; 2825 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict 2826 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) { 2827 fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms; 2828 myMin = fxLimits.minPrio; 2829 myMax = fxLimits.maxPrio; 2830 myMax = MIN2(myMax, (int)fxInfo->fx_uprilim); // clamp - restrict 2831 } else { 2832 // No clue - punt 2833 if (ThreadPriorityVerbose) { 2834 tty->print_cr("Unknown scheduling class: %s ... \n", 2835 ClassInfo.pc_clname); 2836 } 2837 return EINVAL; // no clue, punt 2838 } 2839 2840 if (ThreadPriorityVerbose) { 2841 tty->print_cr("Thread priority Range: [%d..%d]\n", myMin, myMax); 2842 } 2843 2844 priocntl_enable = true; // Enable changing priorities 2845 return 0; 2846 } 2847 2848 #define IAPRI(x) ((iaparms_t *)((x).pc_clparms)) 2849 #define RTPRI(x) ((rtparms_t *)((x).pc_clparms)) 2850 #define TSPRI(x) ((tsparms_t *)((x).pc_clparms)) 2851 #define FXPRI(x) ((fxparms_t *)((x).pc_clparms)) 2852 2853 2854 // scale_to_lwp_priority 2855 // 2856 // Convert from the libthread "thr_setprio" scale to our current 2857 // lwp scheduling class scale. 2858 // 2859 static int scale_to_lwp_priority(int rMin, int rMax, int x) { 2860 int v; 2861 2862 if (x == 127) return rMax; // avoid round-down 2863 v = (((x*(rMax-rMin)))/128)+rMin; 2864 return v; 2865 } 2866 2867 2868 // set_lwp_class_and_priority 2869 int set_lwp_class_and_priority(int ThreadID, int lwpid, 2870 int newPrio, int new_class, bool scale) { 2871 int rslt; 2872 int Actual, Expected, prv; 2873 pcparms_t ParmInfo; // for GET-SET 2874 #ifdef ASSERT 2875 pcparms_t ReadBack; // for readback 2876 #endif 2877 2878 // Set priority via PC_GETPARMS, update, PC_SETPARMS 2879 // Query current values. 2880 // TODO: accelerate this by eliminating the PC_GETPARMS call. 2881 // Cache "pcparms_t" in global ParmCache. 2882 // TODO: elide set-to-same-value 2883 2884 // If something went wrong on init, don't change priorities. 2885 if (!priocntl_enable) { 2886 if (ThreadPriorityVerbose) { 2887 tty->print_cr("Trying to set priority but init failed, ignoring"); 2888 } 2889 return EINVAL; 2890 } 2891 2892 // If lwp hasn't started yet, just return 2893 // the _start routine will call us again. 2894 if (lwpid <= 0) { 2895 if (ThreadPriorityVerbose) { 2896 tty->print_cr("deferring the set_lwp_class_and_priority of thread " 2897 INTPTR_FORMAT " to %d, lwpid not set", 2898 ThreadID, newPrio); 2899 } 2900 return 0; 2901 } 2902 2903 if (ThreadPriorityVerbose) { 2904 tty->print_cr ("set_lwp_class_and_priority(" 2905 INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ", 2906 ThreadID, lwpid, newPrio); 2907 } 2908 2909 memset(&ParmInfo, 0, sizeof(pcparms_t)); 2910 ParmInfo.pc_cid = PC_CLNULL; 2911 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo); 2912 if (rslt < 0) return errno; 2913 2914 int cur_class = ParmInfo.pc_cid; 2915 ParmInfo.pc_cid = (id_t)new_class; 2916 2917 if (new_class == rtLimits.schedPolicy) { 2918 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms; 2919 rtInfo->rt_pri = scale ? scale_to_lwp_priority(rtLimits.minPrio, 2920 rtLimits.maxPrio, newPrio) 2921 : newPrio; 2922 rtInfo->rt_tqsecs = RT_NOCHANGE; 2923 rtInfo->rt_tqnsecs = RT_NOCHANGE; 2924 if (ThreadPriorityVerbose) { 2925 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri); 2926 } 2927 } else if (new_class == iaLimits.schedPolicy) { 2928 iaparms_t* iaInfo = (iaparms_t*)ParmInfo.pc_clparms; 2929 int maxClamped = MIN2(iaLimits.maxPrio, 2930 cur_class == new_class 2931 ? (int)iaInfo->ia_uprilim : iaLimits.maxPrio); 2932 iaInfo->ia_upri = scale ? scale_to_lwp_priority(iaLimits.minPrio, 2933 maxClamped, newPrio) 2934 : newPrio; 2935 iaInfo->ia_uprilim = cur_class == new_class 2936 ? IA_NOCHANGE : (pri_t)iaLimits.maxPrio; 2937 iaInfo->ia_mode = IA_NOCHANGE; 2938 if (ThreadPriorityVerbose) { 2939 tty->print_cr("IA: [%d...%d] %d->%d\n", 2940 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri); 2941 } 2942 } else if (new_class == tsLimits.schedPolicy) { 2943 tsparms_t* tsInfo = (tsparms_t*)ParmInfo.pc_clparms; 2944 int maxClamped = MIN2(tsLimits.maxPrio, 2945 cur_class == new_class 2946 ? (int)tsInfo->ts_uprilim : tsLimits.maxPrio); 2947 tsInfo->ts_upri = scale ? scale_to_lwp_priority(tsLimits.minPrio, 2948 maxClamped, newPrio) 2949 : newPrio; 2950 tsInfo->ts_uprilim = cur_class == new_class 2951 ? TS_NOCHANGE : (pri_t)tsLimits.maxPrio; 2952 if (ThreadPriorityVerbose) { 2953 tty->print_cr("TS: [%d...%d] %d->%d\n", 2954 tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri); 2955 } 2956 } else if (new_class == fxLimits.schedPolicy) { 2957 fxparms_t* fxInfo = (fxparms_t*)ParmInfo.pc_clparms; 2958 int maxClamped = MIN2(fxLimits.maxPrio, 2959 cur_class == new_class 2960 ? (int)fxInfo->fx_uprilim : fxLimits.maxPrio); 2961 fxInfo->fx_upri = scale ? scale_to_lwp_priority(fxLimits.minPrio, 2962 maxClamped, newPrio) 2963 : newPrio; 2964 fxInfo->fx_uprilim = cur_class == new_class 2965 ? FX_NOCHANGE : (pri_t)fxLimits.maxPrio; 2966 fxInfo->fx_tqsecs = FX_NOCHANGE; 2967 fxInfo->fx_tqnsecs = FX_NOCHANGE; 2968 if (ThreadPriorityVerbose) { 2969 tty->print_cr("FX: [%d...%d] %d->%d\n", 2970 fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri); 2971 } 2972 } else { 2973 if (ThreadPriorityVerbose) { 2974 tty->print_cr("Unknown new scheduling class %d\n", new_class); 2975 } 2976 return EINVAL; // no clue, punt 2977 } 2978 2979 rslt = priocntl(P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo); 2980 if (ThreadPriorityVerbose && rslt) { 2981 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno); 2982 } 2983 if (rslt < 0) return errno; 2984 2985 #ifdef ASSERT 2986 // Sanity check: read back what we just attempted to set. 2987 // In theory it could have changed in the interim ... 2988 // 2989 // The priocntl system call is tricky. 2990 // Sometimes it'll validate the priority value argument and 2991 // return EINVAL if unhappy. At other times it fails silently. 2992 // Readbacks are prudent. 2993 2994 if (!ReadBackValidate) return 0; 2995 2996 memset(&ReadBack, 0, sizeof(pcparms_t)); 2997 ReadBack.pc_cid = PC_CLNULL; 2998 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack); 2999 assert(rslt >= 0, "priocntl failed"); 3000 Actual = Expected = 0xBAD; 3001 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match"); 3002 if (ParmInfo.pc_cid == rtLimits.schedPolicy) { 3003 Actual = RTPRI(ReadBack)->rt_pri; 3004 Expected = RTPRI(ParmInfo)->rt_pri; 3005 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { 3006 Actual = IAPRI(ReadBack)->ia_upri; 3007 Expected = IAPRI(ParmInfo)->ia_upri; 3008 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { 3009 Actual = TSPRI(ReadBack)->ts_upri; 3010 Expected = TSPRI(ParmInfo)->ts_upri; 3011 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) { 3012 Actual = FXPRI(ReadBack)->fx_upri; 3013 Expected = FXPRI(ParmInfo)->fx_upri; 3014 } else { 3015 if (ThreadPriorityVerbose) { 3016 tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n", 3017 ParmInfo.pc_cid); 3018 } 3019 } 3020 3021 if (Actual != Expected) { 3022 if (ThreadPriorityVerbose) { 3023 tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n", 3024 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected); 3025 } 3026 } 3027 #endif 3028 3029 return 0; 3030 } 3031 3032 // Solaris only gives access to 128 real priorities at a time, 3033 // so we expand Java's ten to fill this range. This would be better 3034 // if we dynamically adjusted relative priorities. 3035 // 3036 // The ThreadPriorityPolicy option allows us to select 2 different 3037 // priority scales. 3038 // 3039 // ThreadPriorityPolicy=0 3040 // Since the Solaris' default priority is MaximumPriority, we do not 3041 // set a priority lower than Max unless a priority lower than 3042 // NormPriority is requested. 3043 // 3044 // ThreadPriorityPolicy=1 3045 // This mode causes the priority table to get filled with 3046 // linear values. NormPriority get's mapped to 50% of the 3047 // Maximum priority an so on. This will cause VM threads 3048 // to get unfair treatment against other Solaris processes 3049 // which do not explicitly alter their thread priorities. 3050 3051 int os::java_to_os_priority[CriticalPriority + 1] = { 3052 -99999, // 0 Entry should never be used 3053 3054 0, // 1 MinPriority 3055 32, // 2 3056 64, // 3 3057 3058 96, // 4 3059 127, // 5 NormPriority 3060 127, // 6 3061 3062 127, // 7 3063 127, // 8 3064 127, // 9 NearMaxPriority 3065 3066 127, // 10 MaxPriority 3067 3068 -criticalPrio // 11 CriticalPriority 3069 }; 3070 3071 OSReturn os::set_native_priority(Thread* thread, int newpri) { 3072 OSThread* osthread = thread->osthread(); 3073 3074 // Save requested priority in case the thread hasn't been started 3075 osthread->set_native_priority(newpri); 3076 3077 // Check for critical priority request 3078 bool fxcritical = false; 3079 if (newpri == -criticalPrio) { 3080 fxcritical = true; 3081 newpri = criticalPrio; 3082 } 3083 3084 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping"); 3085 if (!UseThreadPriorities) return OS_OK; 3086 3087 int status = 0; 3088 3089 if (!fxcritical) { 3090 // Use thr_setprio only if we have a priority that thr_setprio understands 3091 status = thr_setprio(thread->osthread()->thread_id(), newpri); 3092 } 3093 3094 int lwp_status = 3095 set_lwp_class_and_priority(osthread->thread_id(), 3096 osthread->lwp_id(), 3097 newpri, 3098 fxcritical ? fxLimits.schedPolicy : myClass, 3099 !fxcritical); 3100 if (lwp_status != 0 && fxcritical) { 3101 // Try again, this time without changing the scheduling class 3102 newpri = java_MaxPriority_to_os_priority; 3103 lwp_status = set_lwp_class_and_priority(osthread->thread_id(), 3104 osthread->lwp_id(), 3105 newpri, myClass, false); 3106 } 3107 status |= lwp_status; 3108 return (status == 0) ? OS_OK : OS_ERR; 3109 } 3110 3111 3112 OSReturn os::get_native_priority(const Thread* const thread, 3113 int *priority_ptr) { 3114 int p; 3115 if (!UseThreadPriorities) { 3116 *priority_ptr = NormalPriority; 3117 return OS_OK; 3118 } 3119 int status = thr_getprio(thread->osthread()->thread_id(), &p); 3120 if (status != 0) { 3121 return OS_ERR; 3122 } 3123 *priority_ptr = p; 3124 return OS_OK; 3125 } 3126 3127 //////////////////////////////////////////////////////////////////////////////// 3128 // suspend/resume support 3129 3130 // The low-level signal-based suspend/resume support is a remnant from the 3131 // old VM-suspension that used to be for java-suspension, safepoints etc, 3132 // within hotspot. Currently used by JFR's OSThreadSampler 3133 // 3134 // The remaining code is greatly simplified from the more general suspension 3135 // code that used to be used. 3136 // 3137 // The protocol is quite simple: 3138 // - suspend: 3139 // - sends a signal to the target thread 3140 // - polls the suspend state of the osthread using a yield loop 3141 // - target thread signal handler (SR_handler) sets suspend state 3142 // and blocks in sigsuspend until continued 3143 // - resume: 3144 // - sets target osthread state to continue 3145 // - sends signal to end the sigsuspend loop in the SR_handler 3146 // 3147 // Note that the SR_lock plays no role in this suspend/resume protocol, 3148 // but is checked for NULL in SR_handler as a thread termination indicator. 3149 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs. 3150 // 3151 // Note that resume_clear_context() and suspend_save_context() are needed 3152 // by SR_handler(), so that fetch_frame_from_ucontext() works, 3153 // which in part is used by: 3154 // - Forte Analyzer: AsyncGetCallTrace() 3155 // - StackBanging: get_frame_at_stack_banging_point() 3156 // - JFR: get_topframe()-->....-->get_valid_uc_in_signal_handler() 3157 3158 static void resume_clear_context(OSThread *osthread) { 3159 osthread->set_ucontext(NULL); 3160 } 3161 3162 static void suspend_save_context(OSThread *osthread, ucontext_t* context) { 3163 osthread->set_ucontext(context); 3164 } 3165 3166 static PosixSemaphore sr_semaphore; 3167 3168 void os::Solaris::SR_handler(Thread* thread, ucontext_t* context) { 3169 // Save and restore errno to avoid confusing native code with EINTR 3170 // after sigsuspend. 3171 int old_errno = errno; 3172 3173 OSThread* osthread = thread->osthread(); 3174 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); 3175 3176 os::SuspendResume::State current = osthread->sr.state(); 3177 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { 3178 suspend_save_context(osthread, context); 3179 3180 // attempt to switch the state, we assume we had a SUSPEND_REQUEST 3181 os::SuspendResume::State state = osthread->sr.suspended(); 3182 if (state == os::SuspendResume::SR_SUSPENDED) { 3183 sigset_t suspend_set; // signals for sigsuspend() 3184 3185 // get current set of blocked signals and unblock resume signal 3186 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); 3187 sigdelset(&suspend_set, ASYNC_SIGNAL); 3188 3189 sr_semaphore.signal(); 3190 // wait here until we are resumed 3191 while (1) { 3192 sigsuspend(&suspend_set); 3193 3194 os::SuspendResume::State result = osthread->sr.running(); 3195 if (result == os::SuspendResume::SR_RUNNING) { 3196 sr_semaphore.signal(); 3197 break; 3198 } 3199 } 3200 3201 } else if (state == os::SuspendResume::SR_RUNNING) { 3202 // request was cancelled, continue 3203 } else { 3204 ShouldNotReachHere(); 3205 } 3206 3207 resume_clear_context(osthread); 3208 } else if (current == os::SuspendResume::SR_RUNNING) { 3209 // request was cancelled, continue 3210 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { 3211 // ignore 3212 } else { 3213 // ignore 3214 } 3215 3216 errno = old_errno; 3217 } 3218 3219 void os::print_statistics() { 3220 } 3221 3222 bool os::message_box(const char* title, const char* message) { 3223 int i; 3224 fdStream err(defaultStream::error_fd()); 3225 for (i = 0; i < 78; i++) err.print_raw("="); 3226 err.cr(); 3227 err.print_raw_cr(title); 3228 for (i = 0; i < 78; i++) err.print_raw("-"); 3229 err.cr(); 3230 err.print_raw_cr(message); 3231 for (i = 0; i < 78; i++) err.print_raw("="); 3232 err.cr(); 3233 3234 char buf[16]; 3235 // Prevent process from exiting upon "read error" without consuming all CPU 3236 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 3237 3238 return buf[0] == 'y' || buf[0] == 'Y'; 3239 } 3240 3241 static int sr_notify(OSThread* osthread) { 3242 int status = thr_kill(osthread->thread_id(), ASYNC_SIGNAL); 3243 assert_status(status == 0, status, "thr_kill"); 3244 return status; 3245 } 3246 3247 // "Randomly" selected value for how long we want to spin 3248 // before bailing out on suspending a thread, also how often 3249 // we send a signal to a thread we want to resume 3250 static const int RANDOMLY_LARGE_INTEGER = 1000000; 3251 static const int RANDOMLY_LARGE_INTEGER2 = 100; 3252 3253 static bool do_suspend(OSThread* osthread) { 3254 assert(osthread->sr.is_running(), "thread should be running"); 3255 assert(!sr_semaphore.trywait(), "semaphore has invalid state"); 3256 3257 // mark as suspended and send signal 3258 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { 3259 // failed to switch, state wasn't running? 3260 ShouldNotReachHere(); 3261 return false; 3262 } 3263 3264 if (sr_notify(osthread) != 0) { 3265 ShouldNotReachHere(); 3266 } 3267 3268 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED 3269 while (true) { 3270 if (sr_semaphore.timedwait(2000)) { 3271 break; 3272 } else { 3273 // timeout 3274 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); 3275 if (cancelled == os::SuspendResume::SR_RUNNING) { 3276 return false; 3277 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { 3278 // make sure that we consume the signal on the semaphore as well 3279 sr_semaphore.wait(); 3280 break; 3281 } else { 3282 ShouldNotReachHere(); 3283 return false; 3284 } 3285 } 3286 } 3287 3288 guarantee(osthread->sr.is_suspended(), "Must be suspended"); 3289 return true; 3290 } 3291 3292 static void do_resume(OSThread* osthread) { 3293 assert(osthread->sr.is_suspended(), "thread should be suspended"); 3294 assert(!sr_semaphore.trywait(), "invalid semaphore state"); 3295 3296 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { 3297 // failed to switch to WAKEUP_REQUEST 3298 ShouldNotReachHere(); 3299 return; 3300 } 3301 3302 while (true) { 3303 if (sr_notify(osthread) == 0) { 3304 if (sr_semaphore.timedwait(2)) { 3305 if (osthread->sr.is_running()) { 3306 return; 3307 } 3308 } 3309 } else { 3310 ShouldNotReachHere(); 3311 } 3312 } 3313 3314 guarantee(osthread->sr.is_running(), "Must be running!"); 3315 } 3316 3317 void os::SuspendedThreadTask::internal_do_task() { 3318 if (do_suspend(_thread->osthread())) { 3319 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); 3320 do_task(context); 3321 do_resume(_thread->osthread()); 3322 } 3323 } 3324 3325 // This does not do anything on Solaris. This is basically a hook for being 3326 // able to use structured exception handling (thread-local exception filters) on, e.g., Win32. 3327 void os::os_exception_wrapper(java_call_t f, JavaValue* value, 3328 const methodHandle& method, JavaCallArguments* args, 3329 Thread* thread) { 3330 f(value, method, args, thread); 3331 } 3332 3333 // This routine may be used by user applications as a "hook" to catch signals. 3334 // The user-defined signal handler must pass unrecognized signals to this 3335 // routine, and if it returns true (non-zero), then the signal handler must 3336 // return immediately. If the flag "abort_if_unrecognized" is true, then this 3337 // routine will never retun false (zero), but instead will execute a VM panic 3338 // routine kill the process. 3339 // 3340 // If this routine returns false, it is OK to call it again. This allows 3341 // the user-defined signal handler to perform checks either before or after 3342 // the VM performs its own checks. Naturally, the user code would be making 3343 // a serious error if it tried to handle an exception (such as a null check 3344 // or breakpoint) that the VM was generating for its own correct operation. 3345 // 3346 // This routine may recognize any of the following kinds of signals: 3347 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ, 3348 // ASYNC_SIGNAL. 3349 // It should be consulted by handlers for any of those signals. 3350 // 3351 // The caller of this routine must pass in the three arguments supplied 3352 // to the function referred to in the "sa_sigaction" (not the "sa_handler") 3353 // field of the structure passed to sigaction(). This routine assumes that 3354 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 3355 // 3356 // Note that the VM will print warnings if it detects conflicting signal 3357 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 3358 // 3359 extern "C" JNIEXPORT int JVM_handle_solaris_signal(int signo, 3360 siginfo_t* siginfo, 3361 void* ucontext, 3362 int abort_if_unrecognized); 3363 3364 3365 void signalHandler(int sig, siginfo_t* info, void* ucVoid) { 3366 int orig_errno = errno; // Preserve errno value over signal handler. 3367 JVM_handle_solaris_signal(sig, info, ucVoid, true); 3368 errno = orig_errno; 3369 } 3370 3371 // This boolean allows users to forward their own non-matching signals 3372 // to JVM_handle_solaris_signal, harmlessly. 3373 bool os::Solaris::signal_handlers_are_installed = false; 3374 3375 // For signal-chaining 3376 bool os::Solaris::libjsig_is_loaded = false; 3377 typedef struct sigaction *(*get_signal_t)(int); 3378 get_signal_t os::Solaris::get_signal_action = NULL; 3379 3380 struct sigaction* os::Solaris::get_chained_signal_action(int sig) { 3381 struct sigaction *actp = NULL; 3382 3383 if ((libjsig_is_loaded) && (sig <= Maxsignum)) { 3384 // Retrieve the old signal handler from libjsig 3385 actp = (*get_signal_action)(sig); 3386 } 3387 if (actp == NULL) { 3388 // Retrieve the preinstalled signal handler from jvm 3389 actp = get_preinstalled_handler(sig); 3390 } 3391 3392 return actp; 3393 } 3394 3395 static bool call_chained_handler(struct sigaction *actp, int sig, 3396 siginfo_t *siginfo, void *context) { 3397 // Call the old signal handler 3398 if (actp->sa_handler == SIG_DFL) { 3399 // It's more reasonable to let jvm treat it as an unexpected exception 3400 // instead of taking the default action. 3401 return false; 3402 } else if (actp->sa_handler != SIG_IGN) { 3403 if ((actp->sa_flags & SA_NODEFER) == 0) { 3404 // automaticlly block the signal 3405 sigaddset(&(actp->sa_mask), sig); 3406 } 3407 3408 sa_handler_t hand; 3409 sa_sigaction_t sa; 3410 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 3411 // retrieve the chained handler 3412 if (siginfo_flag_set) { 3413 sa = actp->sa_sigaction; 3414 } else { 3415 hand = actp->sa_handler; 3416 } 3417 3418 if ((actp->sa_flags & SA_RESETHAND) != 0) { 3419 actp->sa_handler = SIG_DFL; 3420 } 3421 3422 // try to honor the signal mask 3423 sigset_t oset; 3424 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); 3425 3426 // call into the chained handler 3427 if (siginfo_flag_set) { 3428 (*sa)(sig, siginfo, context); 3429 } else { 3430 (*hand)(sig); 3431 } 3432 3433 // restore the signal mask 3434 pthread_sigmask(SIG_SETMASK, &oset, 0); 3435 } 3436 // Tell jvm's signal handler the signal is taken care of. 3437 return true; 3438 } 3439 3440 bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) { 3441 bool chained = false; 3442 // signal-chaining 3443 if (UseSignalChaining) { 3444 struct sigaction *actp = get_chained_signal_action(sig); 3445 if (actp != NULL) { 3446 chained = call_chained_handler(actp, sig, siginfo, context); 3447 } 3448 } 3449 return chained; 3450 } 3451 3452 struct sigaction* os::Solaris::get_preinstalled_handler(int sig) { 3453 assert((chainedsigactions != (struct sigaction *)NULL) && 3454 (preinstalled_sigs != (int *)NULL), "signals not yet initialized"); 3455 if (preinstalled_sigs[sig] != 0) { 3456 return &chainedsigactions[sig]; 3457 } 3458 return NULL; 3459 } 3460 3461 void os::Solaris::save_preinstalled_handler(int sig, 3462 struct sigaction& oldAct) { 3463 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range"); 3464 assert((chainedsigactions != (struct sigaction *)NULL) && 3465 (preinstalled_sigs != (int *)NULL), "signals not yet initialized"); 3466 chainedsigactions[sig] = oldAct; 3467 preinstalled_sigs[sig] = 1; 3468 } 3469 3470 void os::Solaris::set_signal_handler(int sig, bool set_installed, 3471 bool oktochain) { 3472 // Check for overwrite. 3473 struct sigaction oldAct; 3474 sigaction(sig, (struct sigaction*)NULL, &oldAct); 3475 void* oldhand = 3476 oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3477 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3478 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 3479 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 3480 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) { 3481 if (AllowUserSignalHandlers || !set_installed) { 3482 // Do not overwrite; user takes responsibility to forward to us. 3483 return; 3484 } else if (UseSignalChaining) { 3485 if (oktochain) { 3486 // save the old handler in jvm 3487 save_preinstalled_handler(sig, oldAct); 3488 } else { 3489 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal."); 3490 } 3491 // libjsig also interposes the sigaction() call below and saves the 3492 // old sigaction on it own. 3493 } else { 3494 fatal("Encountered unexpected pre-existing sigaction handler " 3495 "%#lx for signal %d.", (long)oldhand, sig); 3496 } 3497 } 3498 3499 struct sigaction sigAct; 3500 sigfillset(&(sigAct.sa_mask)); 3501 sigAct.sa_handler = SIG_DFL; 3502 3503 sigAct.sa_sigaction = signalHandler; 3504 // Handle SIGSEGV on alternate signal stack if 3505 // not using stack banging 3506 if (!UseStackBanging && sig == SIGSEGV) { 3507 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK; 3508 } else { 3509 sigAct.sa_flags = SA_SIGINFO | SA_RESTART; 3510 } 3511 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags); 3512 3513 sigaction(sig, &sigAct, &oldAct); 3514 3515 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3516 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3517 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 3518 } 3519 3520 3521 #define DO_SIGNAL_CHECK(sig) \ 3522 do { \ 3523 if (!sigismember(&check_signal_done, sig)) { \ 3524 os::Solaris::check_signal_handler(sig); \ 3525 } \ 3526 } while (0) 3527 3528 // This method is a periodic task to check for misbehaving JNI applications 3529 // under CheckJNI, we can add any periodic checks here 3530 3531 void os::run_periodic_checks() { 3532 // A big source of grief is hijacking virt. addr 0x0 on Solaris, 3533 // thereby preventing a NULL checks. 3534 if (!check_addr0_done) check_addr0_done = check_addr0(tty); 3535 3536 if (check_signals == false) return; 3537 3538 // SEGV and BUS if overridden could potentially prevent 3539 // generation of hs*.log in the event of a crash, debugging 3540 // such a case can be very challenging, so we absolutely 3541 // check for the following for a good measure: 3542 DO_SIGNAL_CHECK(SIGSEGV); 3543 DO_SIGNAL_CHECK(SIGILL); 3544 DO_SIGNAL_CHECK(SIGFPE); 3545 DO_SIGNAL_CHECK(SIGBUS); 3546 DO_SIGNAL_CHECK(SIGPIPE); 3547 DO_SIGNAL_CHECK(SIGXFSZ); 3548 DO_SIGNAL_CHECK(ASYNC_SIGNAL); 3549 3550 // ReduceSignalUsage allows the user to override these handlers 3551 // see comments at the very top and jvm_solaris.h 3552 if (!ReduceSignalUsage) { 3553 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 3554 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 3555 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 3556 DO_SIGNAL_CHECK(BREAK_SIGNAL); 3557 } 3558 } 3559 3560 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 3561 3562 static os_sigaction_t os_sigaction = NULL; 3563 3564 void os::Solaris::check_signal_handler(int sig) { 3565 char buf[O_BUFLEN]; 3566 address jvmHandler = NULL; 3567 3568 struct sigaction act; 3569 if (os_sigaction == NULL) { 3570 // only trust the default sigaction, in case it has been interposed 3571 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); 3572 if (os_sigaction == NULL) return; 3573 } 3574 3575 os_sigaction(sig, (struct sigaction*)NULL, &act); 3576 3577 address thisHandler = (act.sa_flags & SA_SIGINFO) 3578 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 3579 : CAST_FROM_FN_PTR(address, act.sa_handler); 3580 3581 3582 switch (sig) { 3583 case SIGSEGV: 3584 case SIGBUS: 3585 case SIGFPE: 3586 case SIGPIPE: 3587 case SIGXFSZ: 3588 case SIGILL: 3589 case ASYNC_SIGNAL: 3590 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler); 3591 break; 3592 3593 case SHUTDOWN1_SIGNAL: 3594 case SHUTDOWN2_SIGNAL: 3595 case SHUTDOWN3_SIGNAL: 3596 case BREAK_SIGNAL: 3597 jvmHandler = (address)user_handler(); 3598 break; 3599 3600 default: 3601 return; 3602 } 3603 3604 if (thisHandler != jvmHandler) { 3605 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 3606 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 3607 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 3608 // No need to check this sig any longer 3609 sigaddset(&check_signal_done, sig); 3610 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN 3611 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) { 3612 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell", 3613 exception_name(sig, buf, O_BUFLEN)); 3614 } 3615 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) { 3616 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 3617 tty->print("expected:"); 3618 os::Posix::print_sa_flags(tty, os::Solaris::get_our_sigflags(sig)); 3619 tty->cr(); 3620 tty->print(" found:"); 3621 os::Posix::print_sa_flags(tty, act.sa_flags); 3622 tty->cr(); 3623 // No need to check this sig any longer 3624 sigaddset(&check_signal_done, sig); 3625 } 3626 3627 // Print all the signal handler state 3628 if (sigismember(&check_signal_done, sig)) { 3629 print_signal_handlers(tty, buf, O_BUFLEN); 3630 } 3631 3632 } 3633 3634 void os::Solaris::install_signal_handlers() { 3635 signal_handlers_are_installed = true; 3636 3637 // signal-chaining 3638 typedef void (*signal_setting_t)(); 3639 signal_setting_t begin_signal_setting = NULL; 3640 signal_setting_t end_signal_setting = NULL; 3641 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3642 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 3643 if (begin_signal_setting != NULL) { 3644 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3645 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 3646 get_signal_action = CAST_TO_FN_PTR(get_signal_t, 3647 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 3648 libjsig_is_loaded = true; 3649 assert(UseSignalChaining, "should enable signal-chaining"); 3650 } 3651 if (libjsig_is_loaded) { 3652 // Tell libjsig jvm is setting signal handlers 3653 (*begin_signal_setting)(); 3654 } 3655 3656 set_signal_handler(SIGSEGV, true, true); 3657 set_signal_handler(SIGPIPE, true, true); 3658 set_signal_handler(SIGXFSZ, true, true); 3659 set_signal_handler(SIGBUS, true, true); 3660 set_signal_handler(SIGILL, true, true); 3661 set_signal_handler(SIGFPE, true, true); 3662 set_signal_handler(ASYNC_SIGNAL, true, true); 3663 3664 if (libjsig_is_loaded) { 3665 // Tell libjsig jvm finishes setting signal handlers 3666 (*end_signal_setting)(); 3667 } 3668 3669 // We don't activate signal checker if libjsig is in place, we trust ourselves 3670 // and if UserSignalHandler is installed all bets are off. 3671 // Log that signal checking is off only if -verbose:jni is specified. 3672 if (CheckJNICalls) { 3673 if (libjsig_is_loaded) { 3674 log_debug(jni, resolve)("Info: libjsig is activated, all active signal checking is disabled"); 3675 check_signals = false; 3676 } 3677 if (AllowUserSignalHandlers) { 3678 log_debug(jni, resolve)("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 3679 check_signals = false; 3680 } 3681 } 3682 } 3683 3684 3685 void report_error(const char* file_name, int line_no, const char* title, 3686 const char* format, ...); 3687 3688 // (Static) wrappers for the liblgrp API 3689 os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home; 3690 os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init; 3691 os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini; 3692 os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root; 3693 os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children; 3694 os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources; 3695 os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps; 3696 os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale; 3697 os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0; 3698 3699 static address resolve_symbol_lazy(const char* name) { 3700 address addr = (address) dlsym(RTLD_DEFAULT, name); 3701 if (addr == NULL) { 3702 // RTLD_DEFAULT was not defined on some early versions of 2.5.1 3703 addr = (address) dlsym(RTLD_NEXT, name); 3704 } 3705 return addr; 3706 } 3707 3708 static address resolve_symbol(const char* name) { 3709 address addr = resolve_symbol_lazy(name); 3710 if (addr == NULL) { 3711 fatal(dlerror()); 3712 } 3713 return addr; 3714 } 3715 3716 void os::Solaris::libthread_init() { 3717 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators"); 3718 3719 lwp_priocntl_init(); 3720 3721 // RTLD_DEFAULT was not defined on some early versions of 5.5.1 3722 if (func == NULL) { 3723 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators"); 3724 // Guarantee that this VM is running on an new enough OS (5.6 or 3725 // later) that it will have a new enough libthread.so. 3726 guarantee(func != NULL, "libthread.so is too old."); 3727 } 3728 3729 int size; 3730 void (*handler_info_func)(address *, int *); 3731 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo")); 3732 handler_info_func(&handler_start, &size); 3733 handler_end = handler_start + size; 3734 } 3735 3736 3737 int_fnP_mutex_tP os::Solaris::_mutex_lock; 3738 int_fnP_mutex_tP os::Solaris::_mutex_trylock; 3739 int_fnP_mutex_tP os::Solaris::_mutex_unlock; 3740 int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init; 3741 int_fnP_mutex_tP os::Solaris::_mutex_destroy; 3742 int os::Solaris::_mutex_scope = USYNC_THREAD; 3743 3744 int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait; 3745 int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait; 3746 int_fnP_cond_tP os::Solaris::_cond_signal; 3747 int_fnP_cond_tP os::Solaris::_cond_broadcast; 3748 int_fnP_cond_tP_i_vP os::Solaris::_cond_init; 3749 int_fnP_cond_tP os::Solaris::_cond_destroy; 3750 int os::Solaris::_cond_scope = USYNC_THREAD; 3751 bool os::Solaris::_synchronization_initialized; 3752 3753 void os::Solaris::synchronization_init() { 3754 if (UseLWPSynchronization) { 3755 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock"))); 3756 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock"))); 3757 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock"))); 3758 os::Solaris::set_mutex_init(lwp_mutex_init); 3759 os::Solaris::set_mutex_destroy(lwp_mutex_destroy); 3760 os::Solaris::set_mutex_scope(USYNC_THREAD); 3761 3762 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait"))); 3763 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait"))); 3764 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal"))); 3765 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast"))); 3766 os::Solaris::set_cond_init(lwp_cond_init); 3767 os::Solaris::set_cond_destroy(lwp_cond_destroy); 3768 os::Solaris::set_cond_scope(USYNC_THREAD); 3769 } else { 3770 os::Solaris::set_mutex_scope(USYNC_THREAD); 3771 os::Solaris::set_cond_scope(USYNC_THREAD); 3772 3773 if (UsePthreads) { 3774 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock"))); 3775 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock"))); 3776 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock"))); 3777 os::Solaris::set_mutex_init(pthread_mutex_default_init); 3778 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy"))); 3779 3780 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait"))); 3781 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait"))); 3782 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal"))); 3783 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast"))); 3784 os::Solaris::set_cond_init(pthread_cond_default_init); 3785 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy"))); 3786 } else { 3787 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock"))); 3788 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock"))); 3789 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock"))); 3790 os::Solaris::set_mutex_init(::mutex_init); 3791 os::Solaris::set_mutex_destroy(::mutex_destroy); 3792 3793 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait"))); 3794 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait"))); 3795 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal"))); 3796 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast"))); 3797 os::Solaris::set_cond_init(::cond_init); 3798 os::Solaris::set_cond_destroy(::cond_destroy); 3799 } 3800 } 3801 _synchronization_initialized = true; 3802 } 3803 3804 bool os::Solaris::liblgrp_init() { 3805 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY); 3806 if (handle != NULL) { 3807 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home"))); 3808 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init"))); 3809 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini"))); 3810 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root"))); 3811 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children"))); 3812 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources"))); 3813 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps"))); 3814 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t, 3815 dlsym(handle, "lgrp_cookie_stale"))); 3816 3817 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER); 3818 set_lgrp_cookie(c); 3819 return true; 3820 } 3821 return false; 3822 } 3823 3824 // int pset_getloadavg(psetid_t pset, double loadavg[], int nelem); 3825 typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem); 3826 static pset_getloadavg_type pset_getloadavg_ptr = NULL; 3827 3828 void init_pset_getloadavg_ptr(void) { 3829 pset_getloadavg_ptr = 3830 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg"); 3831 if (pset_getloadavg_ptr == NULL) { 3832 log_warning(os)("pset_getloadavg function not found"); 3833 } 3834 } 3835 3836 int os::Solaris::_dev_zero_fd = -1; 3837 3838 // this is called _before_ the global arguments have been parsed 3839 void os::init(void) { 3840 _initial_pid = getpid(); 3841 3842 max_hrtime = first_hrtime = gethrtime(); 3843 3844 init_random(1234567); 3845 3846 page_size = sysconf(_SC_PAGESIZE); 3847 if (page_size == -1) { 3848 fatal("os_solaris.cpp: os::init: sysconf failed (%s)", os::strerror(errno)); 3849 } 3850 init_page_sizes((size_t) page_size); 3851 3852 Solaris::initialize_system_info(); 3853 3854 int fd = ::open("/dev/zero", O_RDWR); 3855 if (fd < 0) { 3856 fatal("os::init: cannot open /dev/zero (%s)", os::strerror(errno)); 3857 } else { 3858 Solaris::set_dev_zero_fd(fd); 3859 3860 // Close on exec, child won't inherit. 3861 fcntl(fd, F_SETFD, FD_CLOEXEC); 3862 } 3863 3864 clock_tics_per_sec = CLK_TCK; 3865 3866 // check if dladdr1() exists; dladdr1 can provide more information than 3867 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9 3868 // and is available on linker patches for 5.7 and 5.8. 3869 // libdl.so must have been loaded, this call is just an entry lookup 3870 void * hdl = dlopen("libdl.so", RTLD_NOW); 3871 if (hdl) { 3872 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1")); 3873 } 3874 3875 // main_thread points to the thread that created/loaded the JVM. 3876 main_thread = thr_self(); 3877 3878 // dynamic lookup of functions that may not be available in our lowest 3879 // supported Solaris release 3880 void * handle = dlopen("libc.so.1", RTLD_LAZY); 3881 if (handle != NULL) { 3882 Solaris::_pthread_setname_np = // from 11.3 3883 (Solaris::pthread_setname_np_func_t)dlsym(handle, "pthread_setname_np"); 3884 } 3885 3886 // Shared Posix initialization 3887 os::Posix::init(); 3888 } 3889 3890 // To install functions for atexit system call 3891 extern "C" { 3892 static void perfMemory_exit_helper() { 3893 perfMemory_exit(); 3894 } 3895 } 3896 3897 // this is called _after_ the global arguments have been parsed 3898 jint os::init_2(void) { 3899 // try to enable extended file IO ASAP, see 6431278 3900 os::Solaris::try_enable_extended_io(); 3901 3902 // Check and sets minimum stack sizes against command line options 3903 if (Posix::set_minimum_stack_sizes() == JNI_ERR) { 3904 return JNI_ERR; 3905 } 3906 3907 Solaris::libthread_init(); 3908 3909 if (UseNUMA) { 3910 if (!Solaris::liblgrp_init()) { 3911 FLAG_SET_ERGO(UseNUMA, false); 3912 } else { 3913 size_t lgrp_limit = os::numa_get_groups_num(); 3914 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtInternal); 3915 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit); 3916 FREE_C_HEAP_ARRAY(int, lgrp_ids); 3917 if (lgrp_num < 2) { 3918 // There's only one locality group, disable NUMA unless 3919 // user explicilty forces NUMA optimizations on single-node/UMA systems 3920 UseNUMA = ForceNUMA; 3921 } 3922 } 3923 } 3924 3925 // When NUMA requested, not-NUMA-aware allocations default to interleaving. 3926 if (UseNUMA && !UseNUMAInterleaving) { 3927 FLAG_SET_ERGO_IF_DEFAULT(UseNUMAInterleaving, true); 3928 } 3929 3930 Solaris::signal_sets_init(); 3931 Solaris::init_signal_mem(); 3932 Solaris::install_signal_handlers(); 3933 // Initialize data for jdk.internal.misc.Signal 3934 if (!ReduceSignalUsage) { 3935 jdk_misc_signal_init(); 3936 } 3937 3938 // initialize synchronization primitives to use either thread or 3939 // lwp synchronization (controlled by UseLWPSynchronization) 3940 Solaris::synchronization_init(); 3941 DEBUG_ONLY(os::set_mutex_init_done();) 3942 3943 if (MaxFDLimit) { 3944 // set the number of file descriptors to max. print out error 3945 // if getrlimit/setrlimit fails but continue regardless. 3946 struct rlimit nbr_files; 3947 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 3948 if (status != 0) { 3949 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno)); 3950 } else { 3951 nbr_files.rlim_cur = nbr_files.rlim_max; 3952 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 3953 if (status != 0) { 3954 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno)); 3955 } 3956 } 3957 } 3958 3959 // Calculate theoretical max. size of Threads to guard gainst 3960 // artifical out-of-memory situations, where all available address- 3961 // space has been reserved by thread stacks. Default stack size is 1Mb. 3962 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ? 3963 JavaThread::stack_size_at_create() : (1*K*K); 3964 assert(pre_thread_stack_size != 0, "Must have a stack"); 3965 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when 3966 // we should start doing Virtual Memory banging. Currently when the threads will 3967 // have used all but 200Mb of space. 3968 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K); 3969 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size; 3970 3971 // at-exit methods are called in the reverse order of their registration. 3972 // In Solaris 7 and earlier, atexit functions are called on return from 3973 // main or as a result of a call to exit(3C). There can be only 32 of 3974 // these functions registered and atexit() does not set errno. In Solaris 3975 // 8 and later, there is no limit to the number of functions registered 3976 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit 3977 // functions are called upon dlclose(3DL) in addition to return from main 3978 // and exit(3C). 3979 3980 if (PerfAllowAtExitRegistration) { 3981 // only register atexit functions if PerfAllowAtExitRegistration is set. 3982 // atexit functions can be delayed until process exit time, which 3983 // can be problematic for embedded VM situations. Embedded VMs should 3984 // call DestroyJavaVM() to assure that VM resources are released. 3985 3986 // note: perfMemory_exit_helper atexit function may be removed in 3987 // the future if the appropriate cleanup code can be added to the 3988 // VM_Exit VMOperation's doit method. 3989 if (atexit(perfMemory_exit_helper) != 0) { 3990 warning("os::init2 atexit(perfMemory_exit_helper) failed"); 3991 } 3992 } 3993 3994 // Init pset_loadavg function pointer 3995 init_pset_getloadavg_ptr(); 3996 3997 // Shared Posix initialization 3998 os::Posix::init_2(); 3999 4000 return JNI_OK; 4001 } 4002 4003 // Is a (classpath) directory empty? 4004 bool os::dir_is_empty(const char* path) { 4005 DIR *dir = NULL; 4006 struct dirent *ptr; 4007 4008 dir = opendir(path); 4009 if (dir == NULL) return true; 4010 4011 // Scan the directory 4012 bool result = true; 4013 while (result && (ptr = readdir(dir)) != NULL) { 4014 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 4015 result = false; 4016 } 4017 } 4018 closedir(dir); 4019 return result; 4020 } 4021 4022 // This code originates from JDK's sysOpen and open64_w 4023 // from src/solaris/hpi/src/system_md.c 4024 4025 int os::open(const char *path, int oflag, int mode) { 4026 if (strlen(path) > MAX_PATH - 1) { 4027 errno = ENAMETOOLONG; 4028 return -1; 4029 } 4030 int fd; 4031 4032 fd = ::open64(path, oflag, mode); 4033 if (fd == -1) return -1; 4034 4035 // If the open succeeded, the file might still be a directory 4036 { 4037 struct stat64 buf64; 4038 int ret = ::fstat64(fd, &buf64); 4039 int st_mode = buf64.st_mode; 4040 4041 if (ret != -1) { 4042 if ((st_mode & S_IFMT) == S_IFDIR) { 4043 errno = EISDIR; 4044 ::close(fd); 4045 return -1; 4046 } 4047 } else { 4048 ::close(fd); 4049 return -1; 4050 } 4051 } 4052 4053 // 32-bit Solaris systems suffer from: 4054 // 4055 // - an historical default soft limit of 256 per-process file 4056 // descriptors that is too low for many Java programs. 4057 // 4058 // - a design flaw where file descriptors created using stdio 4059 // fopen must be less than 256, _even_ when the first limit above 4060 // has been raised. This can cause calls to fopen (but not calls to 4061 // open, for example) to fail mysteriously, perhaps in 3rd party 4062 // native code (although the JDK itself uses fopen). One can hardly 4063 // criticize them for using this most standard of all functions. 4064 // 4065 // We attempt to make everything work anyways by: 4066 // 4067 // - raising the soft limit on per-process file descriptors beyond 4068 // 256 4069 // 4070 // - As of Solaris 10u4, we can request that Solaris raise the 256 4071 // stdio fopen limit by calling function enable_extended_FILE_stdio. 4072 // This is done in init_2 and recorded in enabled_extended_FILE_stdio 4073 // 4074 // - If we are stuck on an old (pre 10u4) Solaris system, we can 4075 // workaround the bug by remapping non-stdio file descriptors below 4076 // 256 to ones beyond 256, which is done below. 4077 // 4078 // See: 4079 // 1085341: 32-bit stdio routines should support file descriptors >255 4080 // 6533291: Work around 32-bit Solaris stdio limit of 256 open files 4081 // 6431278: Netbeans crash on 32 bit Solaris: need to call 4082 // enable_extended_FILE_stdio() in VM initialisation 4083 // Giri Mandalika's blog 4084 // http://technopark02.blogspot.com/2005_05_01_archive.html 4085 // 4086 #ifndef _LP64 4087 if ((!enabled_extended_FILE_stdio) && fd < 256) { 4088 int newfd = ::fcntl(fd, F_DUPFD, 256); 4089 if (newfd != -1) { 4090 ::close(fd); 4091 fd = newfd; 4092 } 4093 } 4094 #endif // 32-bit Solaris 4095 4096 // All file descriptors that are opened in the JVM and not 4097 // specifically destined for a subprocess should have the 4098 // close-on-exec flag set. If we don't set it, then careless 3rd 4099 // party native code might fork and exec without closing all 4100 // appropriate file descriptors (e.g. as we do in closeDescriptors in 4101 // UNIXProcess.c), and this in turn might: 4102 // 4103 // - cause end-of-file to fail to be detected on some file 4104 // descriptors, resulting in mysterious hangs, or 4105 // 4106 // - might cause an fopen in the subprocess to fail on a system 4107 // suffering from bug 1085341. 4108 // 4109 // (Yes, the default setting of the close-on-exec flag is a Unix 4110 // design flaw) 4111 // 4112 // See: 4113 // 1085341: 32-bit stdio routines should support file descriptors >255 4114 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed 4115 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 4116 // 4117 #ifdef FD_CLOEXEC 4118 { 4119 int flags = ::fcntl(fd, F_GETFD); 4120 if (flags != -1) { 4121 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); 4122 } 4123 } 4124 #endif 4125 4126 return fd; 4127 } 4128 4129 // create binary file, rewriting existing file if required 4130 int os::create_binary_file(const char* path, bool rewrite_existing) { 4131 int oflags = O_WRONLY | O_CREAT; 4132 if (!rewrite_existing) { 4133 oflags |= O_EXCL; 4134 } 4135 return ::open64(path, oflags, S_IREAD | S_IWRITE); 4136 } 4137 4138 // return current position of file pointer 4139 jlong os::current_file_offset(int fd) { 4140 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR); 4141 } 4142 4143 // move file pointer to the specified offset 4144 jlong os::seek_to_file_offset(int fd, jlong offset) { 4145 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET); 4146 } 4147 4148 jlong os::lseek(int fd, jlong offset, int whence) { 4149 return (jlong) ::lseek64(fd, offset, whence); 4150 } 4151 4152 int os::ftruncate(int fd, jlong length) { 4153 return ::ftruncate64(fd, length); 4154 } 4155 4156 int os::fsync(int fd) { 4157 RESTARTABLE_RETURN_INT(::fsync(fd)); 4158 } 4159 4160 int os::available(int fd, jlong *bytes) { 4161 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 4162 "Assumed _thread_in_native"); 4163 jlong cur, end; 4164 int mode; 4165 struct stat64 buf64; 4166 4167 if (::fstat64(fd, &buf64) >= 0) { 4168 mode = buf64.st_mode; 4169 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 4170 int n,ioctl_return; 4171 4172 RESTARTABLE(::ioctl(fd, FIONREAD, &n), ioctl_return); 4173 if (ioctl_return>= 0) { 4174 *bytes = n; 4175 return 1; 4176 } 4177 } 4178 } 4179 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) { 4180 return 0; 4181 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) { 4182 return 0; 4183 } else if (::lseek64(fd, cur, SEEK_SET) == -1) { 4184 return 0; 4185 } 4186 *bytes = end - cur; 4187 return 1; 4188 } 4189 4190 // Map a block of memory. 4191 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 4192 char *addr, size_t bytes, bool read_only, 4193 bool allow_exec) { 4194 int prot; 4195 int flags; 4196 4197 if (read_only) { 4198 prot = PROT_READ; 4199 flags = MAP_SHARED; 4200 } else { 4201 prot = PROT_READ | PROT_WRITE; 4202 flags = MAP_PRIVATE; 4203 } 4204 4205 if (allow_exec) { 4206 prot |= PROT_EXEC; 4207 } 4208 4209 if (addr != NULL) { 4210 flags |= MAP_FIXED; 4211 } 4212 4213 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, 4214 fd, file_offset); 4215 if (mapped_address == MAP_FAILED) { 4216 return NULL; 4217 } 4218 return mapped_address; 4219 } 4220 4221 4222 // Remap a block of memory. 4223 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 4224 char *addr, size_t bytes, bool read_only, 4225 bool allow_exec) { 4226 // same as map_memory() on this OS 4227 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 4228 allow_exec); 4229 } 4230 4231 4232 // Unmap a block of memory. 4233 bool os::pd_unmap_memory(char* addr, size_t bytes) { 4234 return munmap(addr, bytes) == 0; 4235 } 4236 4237 void os::pause() { 4238 char filename[MAX_PATH]; 4239 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 4240 jio_snprintf(filename, MAX_PATH, "%s", PauseAtStartupFile); 4241 } else { 4242 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 4243 } 4244 4245 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 4246 if (fd != -1) { 4247 struct stat buf; 4248 ::close(fd); 4249 while (::stat(filename, &buf) == 0) { 4250 (void)::poll(NULL, 0, 100); 4251 } 4252 } else { 4253 jio_fprintf(stderr, 4254 "Could not open pause file '%s', continuing immediately.\n", filename); 4255 } 4256 } 4257 4258 #ifndef PRODUCT 4259 #ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS 4260 // Turn this on if you need to trace synch operations. 4261 // Set RECORD_SYNCH_LIMIT to a large-enough value, 4262 // and call record_synch_enable and record_synch_disable 4263 // around the computation of interest. 4264 4265 void record_synch(char* name, bool returning); // defined below 4266 4267 class RecordSynch { 4268 char* _name; 4269 public: 4270 RecordSynch(char* name) :_name(name) { record_synch(_name, false); } 4271 ~RecordSynch() { record_synch(_name, true); } 4272 }; 4273 4274 #define CHECK_SYNCH_OP(ret, name, params, args, inner) \ 4275 extern "C" ret name params { \ 4276 typedef ret name##_t params; \ 4277 static name##_t* implem = NULL; \ 4278 static int callcount = 0; \ 4279 if (implem == NULL) { \ 4280 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \ 4281 if (implem == NULL) fatal(dlerror()); \ 4282 } \ 4283 ++callcount; \ 4284 RecordSynch _rs(#name); \ 4285 inner; \ 4286 return implem args; \ 4287 } 4288 // in dbx, examine callcounts this way: 4289 // for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done 4290 4291 #define CHECK_POINTER_OK(p) \ 4292 (!Universe::is_fully_initialized() || !Universe::is_reserved_heap((oop)(p))) 4293 #define CHECK_MU \ 4294 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only."); 4295 #define CHECK_CV \ 4296 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only."); 4297 #define CHECK_P(p) \ 4298 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only."); 4299 4300 #define CHECK_MUTEX(mutex_op) \ 4301 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU); 4302 4303 CHECK_MUTEX( mutex_lock) 4304 CHECK_MUTEX( _mutex_lock) 4305 CHECK_MUTEX( mutex_unlock) 4306 CHECK_MUTEX(_mutex_unlock) 4307 CHECK_MUTEX( mutex_trylock) 4308 CHECK_MUTEX(_mutex_trylock) 4309 4310 #define CHECK_COND(cond_op) \ 4311 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU; CHECK_CV); 4312 4313 CHECK_COND( cond_wait); 4314 CHECK_COND(_cond_wait); 4315 CHECK_COND(_cond_wait_cancel); 4316 4317 #define CHECK_COND2(cond_op) \ 4318 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU; CHECK_CV); 4319 4320 CHECK_COND2( cond_timedwait); 4321 CHECK_COND2(_cond_timedwait); 4322 CHECK_COND2(_cond_timedwait_cancel); 4323 4324 // do the _lwp_* versions too 4325 #define mutex_t lwp_mutex_t 4326 #define cond_t lwp_cond_t 4327 CHECK_MUTEX( _lwp_mutex_lock) 4328 CHECK_MUTEX( _lwp_mutex_unlock) 4329 CHECK_MUTEX( _lwp_mutex_trylock) 4330 CHECK_MUTEX( __lwp_mutex_lock) 4331 CHECK_MUTEX( __lwp_mutex_unlock) 4332 CHECK_MUTEX( __lwp_mutex_trylock) 4333 CHECK_MUTEX(___lwp_mutex_lock) 4334 CHECK_MUTEX(___lwp_mutex_unlock) 4335 4336 CHECK_COND( _lwp_cond_wait); 4337 CHECK_COND( __lwp_cond_wait); 4338 CHECK_COND(___lwp_cond_wait); 4339 4340 CHECK_COND2( _lwp_cond_timedwait); 4341 CHECK_COND2( __lwp_cond_timedwait); 4342 #undef mutex_t 4343 #undef cond_t 4344 4345 CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0); 4346 CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0); 4347 CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0); 4348 CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0); 4349 CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p)); 4350 CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p)); 4351 CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV); 4352 CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV); 4353 4354 4355 // recording machinery: 4356 4357 enum { RECORD_SYNCH_LIMIT = 200 }; 4358 char* record_synch_name[RECORD_SYNCH_LIMIT]; 4359 void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT]; 4360 bool record_synch_returning[RECORD_SYNCH_LIMIT]; 4361 thread_t record_synch_thread[RECORD_SYNCH_LIMIT]; 4362 int record_synch_count = 0; 4363 bool record_synch_enabled = false; 4364 4365 // in dbx, examine recorded data this way: 4366 // for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done 4367 4368 void record_synch(char* name, bool returning) { 4369 if (record_synch_enabled) { 4370 if (record_synch_count < RECORD_SYNCH_LIMIT) { 4371 record_synch_name[record_synch_count] = name; 4372 record_synch_returning[record_synch_count] = returning; 4373 record_synch_thread[record_synch_count] = thr_self(); 4374 record_synch_arg0ptr[record_synch_count] = &name; 4375 record_synch_count++; 4376 } 4377 // put more checking code here: 4378 // ... 4379 } 4380 } 4381 4382 void record_synch_enable() { 4383 // start collecting trace data, if not already doing so 4384 if (!record_synch_enabled) record_synch_count = 0; 4385 record_synch_enabled = true; 4386 } 4387 4388 void record_synch_disable() { 4389 // stop collecting trace data 4390 record_synch_enabled = false; 4391 } 4392 4393 #endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS 4394 #endif // PRODUCT 4395 4396 const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime); 4397 const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) - 4398 (intptr_t)(&((prusage_t *)(NULL))->pr_utime); 4399 4400 4401 // JVMTI & JVM monitoring and management support 4402 // The thread_cpu_time() and current_thread_cpu_time() are only 4403 // supported if is_thread_cpu_time_supported() returns true. 4404 // They are not supported on Solaris T1. 4405 4406 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 4407 // are used by JVM M&M and JVMTI to get user+sys or user CPU time 4408 // of a thread. 4409 // 4410 // current_thread_cpu_time() and thread_cpu_time(Thread *) 4411 // returns the fast estimate available on the platform. 4412 4413 // hrtime_t gethrvtime() return value includes 4414 // user time but does not include system time 4415 jlong os::current_thread_cpu_time() { 4416 return (jlong) gethrvtime(); 4417 } 4418 4419 jlong os::thread_cpu_time(Thread *thread) { 4420 // return user level CPU time only to be consistent with 4421 // what current_thread_cpu_time returns. 4422 // thread_cpu_time_info() must be changed if this changes 4423 return os::thread_cpu_time(thread, false /* user time only */); 4424 } 4425 4426 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 4427 if (user_sys_cpu_time) { 4428 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 4429 } else { 4430 return os::current_thread_cpu_time(); 4431 } 4432 } 4433 4434 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 4435 char proc_name[64]; 4436 int count; 4437 prusage_t prusage; 4438 jlong lwp_time; 4439 int fd; 4440 4441 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage", 4442 getpid(), 4443 thread->osthread()->lwp_id()); 4444 fd = ::open(proc_name, O_RDONLY); 4445 if (fd == -1) return -1; 4446 4447 do { 4448 count = ::pread(fd, 4449 (void *)&prusage.pr_utime, 4450 thr_time_size, 4451 thr_time_off); 4452 } while (count < 0 && errno == EINTR); 4453 ::close(fd); 4454 if (count < 0) return -1; 4455 4456 if (user_sys_cpu_time) { 4457 // user + system CPU time 4458 lwp_time = (((jlong)prusage.pr_stime.tv_sec + 4459 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) + 4460 (jlong)prusage.pr_stime.tv_nsec + 4461 (jlong)prusage.pr_utime.tv_nsec; 4462 } else { 4463 // user level CPU time only 4464 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) + 4465 (jlong)prusage.pr_utime.tv_nsec; 4466 } 4467 4468 return (lwp_time); 4469 } 4470 4471 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4472 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 4473 info_ptr->may_skip_backward = false; // elapsed time not wall time 4474 info_ptr->may_skip_forward = false; // elapsed time not wall time 4475 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned 4476 } 4477 4478 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4479 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 4480 info_ptr->may_skip_backward = false; // elapsed time not wall time 4481 info_ptr->may_skip_forward = false; // elapsed time not wall time 4482 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned 4483 } 4484 4485 bool os::is_thread_cpu_time_supported() { 4486 return true; 4487 } 4488 4489 // System loadavg support. Returns -1 if load average cannot be obtained. 4490 // Return the load average for our processor set if the primitive exists 4491 // (Solaris 9 and later). Otherwise just return system wide loadavg. 4492 int os::loadavg(double loadavg[], int nelem) { 4493 if (pset_getloadavg_ptr != NULL) { 4494 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem); 4495 } else { 4496 return ::getloadavg(loadavg, nelem); 4497 } 4498 } 4499 4500 //--------------------------------------------------------------------------------- 4501 4502 bool os::find(address addr, outputStream* st) { 4503 Dl_info dlinfo; 4504 memset(&dlinfo, 0, sizeof(dlinfo)); 4505 if (dladdr(addr, &dlinfo) != 0) { 4506 st->print(PTR_FORMAT ": ", addr); 4507 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) { 4508 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr); 4509 } else if (dlinfo.dli_fbase != NULL) { 4510 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase); 4511 } else { 4512 st->print("<absolute address>"); 4513 } 4514 if (dlinfo.dli_fname != NULL) { 4515 st->print(" in %s", dlinfo.dli_fname); 4516 } 4517 if (dlinfo.dli_fbase != NULL) { 4518 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); 4519 } 4520 st->cr(); 4521 4522 if (Verbose) { 4523 // decode some bytes around the PC 4524 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size()); 4525 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); 4526 address lowest = (address) dlinfo.dli_sname; 4527 if (!lowest) lowest = (address) dlinfo.dli_fbase; 4528 if (begin < lowest) begin = lowest; 4529 Dl_info dlinfo2; 4530 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr 4531 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) { 4532 end = (address) dlinfo2.dli_saddr; 4533 } 4534 Disassembler::decode(begin, end, st); 4535 } 4536 return true; 4537 } 4538 return false; 4539 } 4540 4541 // Following function has been added to support HotSparc's libjvm.so running 4542 // under Solaris production JDK 1.2.2 / 1.3.0. These came from 4543 // src/solaris/hpi/native_threads in the EVM codebase. 4544 // 4545 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release 4546 // libraries and should thus be removed. We will leave it behind for a while 4547 // until we no longer want to able to run on top of 1.3.0 Solaris production 4548 // JDK. See 4341971. 4549 4550 #define STACK_SLACK 0x800 4551 4552 extern "C" { 4553 intptr_t sysThreadAvailableStackWithSlack() { 4554 stack_t st; 4555 intptr_t retval, stack_top; 4556 retval = thr_stksegment(&st); 4557 assert(retval == 0, "incorrect return value from thr_stksegment"); 4558 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned"); 4559 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned"); 4560 stack_top=(intptr_t)st.ss_sp-st.ss_size; 4561 return ((intptr_t)&stack_top - stack_top - STACK_SLACK); 4562 } 4563 } 4564 4565 // ObjectMonitor park-unpark infrastructure ... 4566 // 4567 // We implement Solaris and Linux PlatformEvents with the 4568 // obvious condvar-mutex-flag triple. 4569 // Another alternative that works quite well is pipes: 4570 // Each PlatformEvent consists of a pipe-pair. 4571 // The thread associated with the PlatformEvent 4572 // calls park(), which reads from the input end of the pipe. 4573 // Unpark() writes into the other end of the pipe. 4574 // The write-side of the pipe must be set NDELAY. 4575 // Unfortunately pipes consume a large # of handles. 4576 // Native solaris lwp_park() and lwp_unpark() work nicely, too. 4577 // Using pipes for the 1st few threads might be workable, however. 4578 // 4579 // park() is permitted to return spuriously. 4580 // Callers of park() should wrap the call to park() in 4581 // an appropriate loop. A litmus test for the correct 4582 // usage of park is the following: if park() were modified 4583 // to immediately return 0 your code should still work, 4584 // albeit degenerating to a spin loop. 4585 // 4586 // In a sense, park()-unpark() just provides more polite spinning 4587 // and polling with the key difference over naive spinning being 4588 // that a parked thread needs to be explicitly unparked() in order 4589 // to wake up and to poll the underlying condition. 4590 // 4591 // Assumption: 4592 // Only one parker can exist on an event, which is why we allocate 4593 // them per-thread. Multiple unparkers can coexist. 4594 // 4595 // _Event transitions in park() 4596 // -1 => -1 : illegal 4597 // 1 => 0 : pass - return immediately 4598 // 0 => -1 : block; then set _Event to 0 before returning 4599 // 4600 // _Event transitions in unpark() 4601 // 0 => 1 : just return 4602 // 1 => 1 : just return 4603 // -1 => either 0 or 1; must signal target thread 4604 // That is, we can safely transition _Event from -1 to either 4605 // 0 or 1. 4606 // 4607 // _Event serves as a restricted-range semaphore. 4608 // -1 : thread is blocked, i.e. there is a waiter 4609 // 0 : neutral: thread is running or ready, 4610 // could have been signaled after a wait started 4611 // 1 : signaled - thread is running or ready 4612 // 4613 // Another possible encoding of _Event would be with 4614 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits. 4615 // 4616 // TODO-FIXME: add DTRACE probes for: 4617 // 1. Tx parks 4618 // 2. Ty unparks Tx 4619 // 3. Tx resumes from park 4620 4621 4622 // value determined through experimentation 4623 #define ROUNDINGFIX 11 4624 4625 // utility to compute the abstime argument to timedwait. 4626 // TODO-FIXME: switch from compute_abstime() to unpackTime(). 4627 4628 static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) { 4629 // millis is the relative timeout time 4630 // abstime will be the absolute timeout time 4631 if (millis < 0) millis = 0; 4632 struct timeval now; 4633 int status = gettimeofday(&now, NULL); 4634 assert(status == 0, "gettimeofday"); 4635 jlong seconds = millis / 1000; 4636 jlong max_wait_period; 4637 4638 if (UseLWPSynchronization) { 4639 // forward port of fix for 4275818 (not sleeping long enough) 4640 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where 4641 // _lwp_cond_timedwait() used a round_down algorithm rather 4642 // than a round_up. For millis less than our roundfactor 4643 // it rounded down to 0 which doesn't meet the spec. 4644 // For millis > roundfactor we may return a bit sooner, but 4645 // since we can not accurately identify the patch level and 4646 // this has already been fixed in Solaris 9 and 8 we will 4647 // leave it alone rather than always rounding down. 4648 4649 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX; 4650 // It appears that when we go directly through Solaris _lwp_cond_timedwait() 4651 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6 4652 max_wait_period = 21000000; 4653 } else { 4654 max_wait_period = 50000000; 4655 } 4656 millis %= 1000; 4657 if (seconds > max_wait_period) { // see man cond_timedwait(3T) 4658 seconds = max_wait_period; 4659 } 4660 abstime->tv_sec = now.tv_sec + seconds; 4661 long usec = now.tv_usec + millis * 1000; 4662 if (usec >= 1000000) { 4663 abstime->tv_sec += 1; 4664 usec -= 1000000; 4665 } 4666 abstime->tv_nsec = usec * 1000; 4667 return abstime; 4668 } 4669 4670 void os::PlatformEvent::park() { // AKA: down() 4671 // Transitions for _Event: 4672 // -1 => -1 : illegal 4673 // 1 => 0 : pass - return immediately 4674 // 0 => -1 : block; then set _Event to 0 before returning 4675 4676 // Invariant: Only the thread associated with the Event/PlatformEvent 4677 // may call park(). 4678 assert(_nParked == 0, "invariant"); 4679 4680 int v; 4681 for (;;) { 4682 v = _Event; 4683 if (Atomic::cmpxchg(&_Event, v, v-1) == v) break; 4684 } 4685 guarantee(v >= 0, "invariant"); 4686 if (v == 0) { 4687 // Do this the hard way by blocking ... 4688 // See http://monaco.sfbay/detail.jsf?cr=5094058. 4689 int status = os::Solaris::mutex_lock(_mutex); 4690 assert_status(status == 0, status, "mutex_lock"); 4691 guarantee(_nParked == 0, "invariant"); 4692 ++_nParked; 4693 while (_Event < 0) { 4694 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... 4695 // Treat this the same as if the wait was interrupted 4696 // With usr/lib/lwp going to kernel, always handle ETIME 4697 status = os::Solaris::cond_wait(_cond, _mutex); 4698 if (status == ETIME) status = EINTR; 4699 assert_status(status == 0 || status == EINTR, status, "cond_wait"); 4700 } 4701 --_nParked; 4702 _Event = 0; 4703 status = os::Solaris::mutex_unlock(_mutex); 4704 assert_status(status == 0, status, "mutex_unlock"); 4705 // Paranoia to ensure our locked and lock-free paths interact 4706 // correctly with each other. 4707 OrderAccess::fence(); 4708 } 4709 } 4710 4711 int os::PlatformEvent::park(jlong millis) { 4712 // Transitions for _Event: 4713 // -1 => -1 : illegal 4714 // 1 => 0 : pass - return immediately 4715 // 0 => -1 : block; then set _Event to 0 before returning 4716 4717 guarantee(_nParked == 0, "invariant"); 4718 int v; 4719 for (;;) { 4720 v = _Event; 4721 if (Atomic::cmpxchg(&_Event, v, v-1) == v) break; 4722 } 4723 guarantee(v >= 0, "invariant"); 4724 if (v != 0) return OS_OK; 4725 4726 int ret = OS_TIMEOUT; 4727 timestruc_t abst; 4728 compute_abstime(&abst, millis); 4729 4730 // See http://monaco.sfbay/detail.jsf?cr=5094058. 4731 int status = os::Solaris::mutex_lock(_mutex); 4732 assert_status(status == 0, status, "mutex_lock"); 4733 guarantee(_nParked == 0, "invariant"); 4734 ++_nParked; 4735 while (_Event < 0) { 4736 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst); 4737 assert_status(status == 0 || status == EINTR || 4738 status == ETIME || status == ETIMEDOUT, 4739 status, "cond_timedwait"); 4740 if (!FilterSpuriousWakeups) break; // previous semantics 4741 if (status == ETIME || status == ETIMEDOUT) break; 4742 // We consume and ignore EINTR and spurious wakeups. 4743 } 4744 --_nParked; 4745 if (_Event >= 0) ret = OS_OK; 4746 _Event = 0; 4747 status = os::Solaris::mutex_unlock(_mutex); 4748 assert_status(status == 0, status, "mutex_unlock"); 4749 // Paranoia to ensure our locked and lock-free paths interact 4750 // correctly with each other. 4751 OrderAccess::fence(); 4752 return ret; 4753 } 4754 4755 void os::PlatformEvent::unpark() { 4756 // Transitions for _Event: 4757 // 0 => 1 : just return 4758 // 1 => 1 : just return 4759 // -1 => either 0 or 1; must signal target thread 4760 // That is, we can safely transition _Event from -1 to either 4761 // 0 or 1. 4762 // See also: "Semaphores in Plan 9" by Mullender & Cox 4763 // 4764 // Note: Forcing a transition from "-1" to "1" on an unpark() means 4765 // that it will take two back-to-back park() calls for the owning 4766 // thread to block. This has the benefit of forcing a spurious return 4767 // from the first park() call after an unpark() call which will help 4768 // shake out uses of park() and unpark() without condition variables. 4769 4770 if (Atomic::xchg(&_Event, 1) >= 0) return; 4771 4772 // If the thread associated with the event was parked, wake it. 4773 // Wait for the thread assoc with the PlatformEvent to vacate. 4774 int status = os::Solaris::mutex_lock(_mutex); 4775 assert_status(status == 0, status, "mutex_lock"); 4776 int AnyWaiters = _nParked; 4777 status = os::Solaris::mutex_unlock(_mutex); 4778 assert_status(status == 0, status, "mutex_unlock"); 4779 guarantee(AnyWaiters == 0 || AnyWaiters == 1, "invariant"); 4780 if (AnyWaiters != 0) { 4781 // Note that we signal() *after* dropping the lock for "immortal" Events. 4782 // This is safe and avoids a common class of futile wakeups. In rare 4783 // circumstances this can cause a thread to return prematurely from 4784 // cond_{timed}wait() but the spurious wakeup is benign and the victim 4785 // will simply re-test the condition and re-park itself. 4786 // This provides particular benefit if the underlying platform does not 4787 // provide wait morphing. 4788 status = os::Solaris::cond_signal(_cond); 4789 assert_status(status == 0, status, "cond_signal"); 4790 } 4791 } 4792 4793 // JSR166 4794 // ------------------------------------------------------- 4795 4796 // The solaris and linux implementations of park/unpark are fairly 4797 // conservative for now, but can be improved. They currently use a 4798 // mutex/condvar pair, plus _counter. 4799 // Park decrements _counter if > 0, else does a condvar wait. Unpark 4800 // sets count to 1 and signals condvar. Only one thread ever waits 4801 // on the condvar. Contention seen when trying to park implies that someone 4802 // is unparking you, so don't wait. And spurious returns are fine, so there 4803 // is no need to track notifications. 4804 4805 #define MAX_SECS 100000000 4806 4807 // This code is common to linux and solaris and will be moved to a 4808 // common place in dolphin. 4809 // 4810 // The passed in time value is either a relative time in nanoseconds 4811 // or an absolute time in milliseconds. Either way it has to be unpacked 4812 // into suitable seconds and nanoseconds components and stored in the 4813 // given timespec structure. 4814 // Given time is a 64-bit value and the time_t used in the timespec is only 4815 // a signed-32-bit value (except on 64-bit Linux) we have to watch for 4816 // overflow if times way in the future are given. Further on Solaris versions 4817 // prior to 10 there is a restriction (see cond_timedwait) that the specified 4818 // number of seconds, in abstime, is less than current_time + 100,000,000. 4819 // As it will be 28 years before "now + 100000000" will overflow we can 4820 // ignore overflow and just impose a hard-limit on seconds using the value 4821 // of "now + 100,000,000". This places a limit on the timeout of about 3.17 4822 // years from "now". 4823 // 4824 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) { 4825 assert(time > 0, "convertTime"); 4826 4827 struct timeval now; 4828 int status = gettimeofday(&now, NULL); 4829 assert(status == 0, "gettimeofday"); 4830 4831 time_t max_secs = now.tv_sec + MAX_SECS; 4832 4833 if (isAbsolute) { 4834 jlong secs = time / 1000; 4835 if (secs > max_secs) { 4836 absTime->tv_sec = max_secs; 4837 } else { 4838 absTime->tv_sec = secs; 4839 } 4840 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; 4841 } else { 4842 jlong secs = time / NANOSECS_PER_SEC; 4843 if (secs >= MAX_SECS) { 4844 absTime->tv_sec = max_secs; 4845 absTime->tv_nsec = 0; 4846 } else { 4847 absTime->tv_sec = now.tv_sec + secs; 4848 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; 4849 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { 4850 absTime->tv_nsec -= NANOSECS_PER_SEC; 4851 ++absTime->tv_sec; // note: this must be <= max_secs 4852 } 4853 } 4854 } 4855 assert(absTime->tv_sec >= 0, "tv_sec < 0"); 4856 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); 4857 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); 4858 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); 4859 } 4860 4861 void Parker::park(bool isAbsolute, jlong time) { 4862 // Ideally we'd do something useful while spinning, such 4863 // as calling unpackTime(). 4864 4865 // Optional fast-path check: 4866 // Return immediately if a permit is available. 4867 // We depend on Atomic::xchg() having full barrier semantics 4868 // since we are doing a lock-free update to _counter. 4869 if (Atomic::xchg(&_counter, 0) > 0) return; 4870 4871 // Optional fast-exit: Check interrupt before trying to wait 4872 Thread* thread = Thread::current(); 4873 assert(thread->is_Java_thread(), "Must be JavaThread"); 4874 JavaThread *jt = (JavaThread *)thread; 4875 if (jt->is_interrupted(false)) { 4876 return; 4877 } 4878 4879 // First, demultiplex/decode time arguments 4880 timespec absTime; 4881 if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all 4882 return; 4883 } 4884 if (time > 0) { 4885 // Warning: this code might be exposed to the old Solaris time 4886 // round-down bugs. Grep "roundingFix" for details. 4887 unpackTime(&absTime, isAbsolute, time); 4888 } 4889 4890 // Enter safepoint region 4891 // Beware of deadlocks such as 6317397. 4892 // The per-thread Parker:: _mutex is a classic leaf-lock. 4893 // In particular a thread must never block on the Threads_lock while 4894 // holding the Parker:: mutex. If safepoints are pending both the 4895 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. 4896 ThreadBlockInVM tbivm(jt); 4897 4898 // Can't access interrupt state now that we are _thread_blocked. If we've 4899 // been interrupted since we checked above then _counter will be > 0. 4900 4901 // Don't wait if cannot get lock since interference arises from 4902 // unblocking. 4903 if (os::Solaris::mutex_trylock(_mutex) != 0) { 4904 return; 4905 } 4906 4907 int status; 4908 4909 if (_counter > 0) { // no wait needed 4910 _counter = 0; 4911 status = os::Solaris::mutex_unlock(_mutex); 4912 assert(status == 0, "invariant"); 4913 // Paranoia to ensure our locked and lock-free paths interact 4914 // correctly with each other and Java-level accesses. 4915 OrderAccess::fence(); 4916 return; 4917 } 4918 4919 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 4920 jt->set_suspend_equivalent(); 4921 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 4922 4923 // Do this the hard way by blocking ... 4924 // See http://monaco.sfbay/detail.jsf?cr=5094058. 4925 if (time == 0) { 4926 status = os::Solaris::cond_wait(_cond, _mutex); 4927 } else { 4928 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime); 4929 } 4930 // Note that an untimed cond_wait() can sometimes return ETIME on older 4931 // versions of the Solaris. 4932 assert_status(status == 0 || status == EINTR || 4933 status == ETIME || status == ETIMEDOUT, 4934 status, "cond_timedwait"); 4935 4936 _counter = 0; 4937 status = os::Solaris::mutex_unlock(_mutex); 4938 assert_status(status == 0, status, "mutex_unlock"); 4939 // Paranoia to ensure our locked and lock-free paths interact 4940 // correctly with each other and Java-level accesses. 4941 OrderAccess::fence(); 4942 4943 // If externally suspended while waiting, re-suspend 4944 if (jt->handle_special_suspend_equivalent_condition()) { 4945 jt->java_suspend_self(); 4946 } 4947 } 4948 4949 void Parker::unpark() { 4950 int status = os::Solaris::mutex_lock(_mutex); 4951 assert(status == 0, "invariant"); 4952 const int s = _counter; 4953 _counter = 1; 4954 status = os::Solaris::mutex_unlock(_mutex); 4955 assert(status == 0, "invariant"); 4956 4957 if (s < 1) { 4958 status = os::Solaris::cond_signal(_cond); 4959 assert(status == 0, "invariant"); 4960 } 4961 } 4962 4963 // Platform Mutex/Monitor implementations 4964 4965 os::PlatformMutex::PlatformMutex() { 4966 int status = os::Solaris::mutex_init(&_mutex); 4967 assert_status(status == 0, status, "mutex_init"); 4968 } 4969 4970 os::PlatformMutex::~PlatformMutex() { 4971 int status = os::Solaris::mutex_destroy(&_mutex); 4972 assert_status(status == 0, status, "mutex_destroy"); 4973 } 4974 4975 void os::PlatformMutex::lock() { 4976 int status = os::Solaris::mutex_lock(&_mutex); 4977 assert_status(status == 0, status, "mutex_lock"); 4978 } 4979 4980 void os::PlatformMutex::unlock() { 4981 int status = os::Solaris::mutex_unlock(&_mutex); 4982 assert_status(status == 0, status, "mutex_unlock"); 4983 } 4984 4985 bool os::PlatformMutex::try_lock() { 4986 int status = os::Solaris::mutex_trylock(&_mutex); 4987 assert_status(status == 0 || status == EBUSY, status, "mutex_trylock"); 4988 return status == 0; 4989 } 4990 4991 os::PlatformMonitor::PlatformMonitor() { 4992 int status = os::Solaris::cond_init(&_cond); 4993 assert_status(status == 0, status, "cond_init"); 4994 } 4995 4996 os::PlatformMonitor::~PlatformMonitor() { 4997 int status = os::Solaris::cond_destroy(&_cond); 4998 assert_status(status == 0, status, "cond_destroy"); 4999 } 5000 5001 // Must already be locked 5002 int os::PlatformMonitor::wait(jlong millis) { 5003 assert(millis >= 0, "negative timeout"); 5004 if (millis > 0) { 5005 timestruc_t abst; 5006 int ret = OS_TIMEOUT; 5007 compute_abstime(&abst, millis); 5008 int status = os::Solaris::cond_timedwait(&_cond, &_mutex, &abst); 5009 assert_status(status == 0 || status == EINTR || 5010 status == ETIME || status == ETIMEDOUT, 5011 status, "cond_timedwait"); 5012 // EINTR acts as spurious wakeup - which is permitted anyway 5013 if (status == 0 || status == EINTR) { 5014 ret = OS_OK; 5015 } 5016 return ret; 5017 } else { 5018 int status = os::Solaris::cond_wait(&_cond, &_mutex); 5019 assert_status(status == 0 || status == EINTR, 5020 status, "cond_wait"); 5021 return OS_OK; 5022 } 5023 } 5024 5025 void os::PlatformMonitor::notify() { 5026 int status = os::Solaris::cond_signal(&_cond); 5027 assert_status(status == 0, status, "cond_signal"); 5028 } 5029 5030 void os::PlatformMonitor::notify_all() { 5031 int status = os::Solaris::cond_broadcast(&_cond); 5032 assert_status(status == 0, status, "cond_broadcast"); 5033 } 5034 5035 extern char** environ; 5036 5037 // Run the specified command in a separate process. Return its exit value, 5038 // or -1 on failure (e.g. can't fork a new process). 5039 // Unlike system(), this function can be called from signal handler. It 5040 // doesn't block SIGINT et al. 5041 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) { 5042 char * argv[4]; 5043 argv[0] = (char *)"sh"; 5044 argv[1] = (char *)"-c"; 5045 argv[2] = cmd; 5046 argv[3] = NULL; 5047 5048 // fork is async-safe, fork1 is not so can't use in signal handler 5049 pid_t pid; 5050 Thread* t = Thread::current_or_null_safe(); 5051 if (t != NULL && t->is_inside_signal_handler()) { 5052 pid = fork(); 5053 } else { 5054 pid = fork1(); 5055 } 5056 5057 if (pid < 0) { 5058 // fork failed 5059 warning("fork failed: %s", os::strerror(errno)); 5060 return -1; 5061 5062 } else if (pid == 0) { 5063 // child process 5064 5065 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris 5066 execve("/usr/bin/sh", argv, environ); 5067 5068 // execve failed 5069 _exit(-1); 5070 5071 } else { 5072 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 5073 // care about the actual exit code, for now. 5074 5075 int status; 5076 5077 // Wait for the child process to exit. This returns immediately if 5078 // the child has already exited. */ 5079 while (waitpid(pid, &status, 0) < 0) { 5080 switch (errno) { 5081 case ECHILD: return 0; 5082 case EINTR: break; 5083 default: return -1; 5084 } 5085 } 5086 5087 if (WIFEXITED(status)) { 5088 // The child exited normally; get its exit code. 5089 return WEXITSTATUS(status); 5090 } else if (WIFSIGNALED(status)) { 5091 // The child exited because of a signal 5092 // The best value to return is 0x80 + signal number, 5093 // because that is what all Unix shells do, and because 5094 // it allows callers to distinguish between process exit and 5095 // process death by signal. 5096 return 0x80 + WTERMSIG(status); 5097 } else { 5098 // Unknown exit code; pass it through 5099 return status; 5100 } 5101 } 5102 } 5103 5104 size_t os::write(int fd, const void *buf, unsigned int nBytes) { 5105 size_t res; 5106 RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res); 5107 return res; 5108 } 5109 5110 int os::close(int fd) { 5111 return ::close(fd); 5112 } 5113 5114 int os::socket_close(int fd) { 5115 return ::close(fd); 5116 } 5117 5118 int os::recv(int fd, char* buf, size_t nBytes, uint flags) { 5119 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 5120 "Assumed _thread_in_native"); 5121 RESTARTABLE_RETURN_INT((int)::recv(fd, buf, nBytes, flags)); 5122 } 5123 5124 int os::send(int fd, char* buf, size_t nBytes, uint flags) { 5125 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 5126 "Assumed _thread_in_native"); 5127 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags)); 5128 } 5129 5130 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) { 5131 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags)); 5132 } 5133 5134 // As both poll and select can be interrupted by signals, we have to be 5135 // prepared to restart the system call after updating the timeout, unless 5136 // a poll() is done with timeout == -1, in which case we repeat with this 5137 // "wait forever" value. 5138 5139 int os::connect(int fd, struct sockaddr *him, socklen_t len) { 5140 int _result; 5141 _result = ::connect(fd, him, len); 5142 5143 // On Solaris, when a connect() call is interrupted, the connection 5144 // can be established asynchronously (see 6343810). Subsequent calls 5145 // to connect() must check the errno value which has the semantic 5146 // described below (copied from the connect() man page). Handling 5147 // of asynchronously established connections is required for both 5148 // blocking and non-blocking sockets. 5149 // EINTR The connection attempt was interrupted 5150 // before any data arrived by the delivery of 5151 // a signal. The connection, however, will be 5152 // established asynchronously. 5153 // 5154 // EINPROGRESS The socket is non-blocking, and the connec- 5155 // tion cannot be completed immediately. 5156 // 5157 // EALREADY The socket is non-blocking, and a previous 5158 // connection attempt has not yet been com- 5159 // pleted. 5160 // 5161 // EISCONN The socket is already connected. 5162 if (_result == OS_ERR && errno == EINTR) { 5163 // restarting a connect() changes its errno semantics 5164 RESTARTABLE(::connect(fd, him, len), _result); 5165 // undo these changes 5166 if (_result == OS_ERR) { 5167 if (errno == EALREADY) { 5168 errno = EINPROGRESS; // fall through 5169 } else if (errno == EISCONN) { 5170 errno = 0; 5171 return OS_OK; 5172 } 5173 } 5174 } 5175 return _result; 5176 } 5177 5178 // Get the default path to the core file 5179 // Returns the length of the string 5180 int os::get_core_path(char* buffer, size_t bufferSize) { 5181 const char* p = get_current_directory(buffer, bufferSize); 5182 5183 if (p == NULL) { 5184 assert(p != NULL, "failed to get current directory"); 5185 return 0; 5186 } 5187 5188 jio_snprintf(buffer, bufferSize, "%s/core or core.%d", 5189 p, current_process_id()); 5190 5191 return strlen(buffer); 5192 } 5193 5194 bool os::supports_map_sync() { 5195 return false; 5196 } 5197 5198 #ifndef PRODUCT 5199 void TestReserveMemorySpecial_test() { 5200 // No tests available for this platform 5201 } 5202 #endif 5203 5204 bool os::start_debugging(char *buf, int buflen) { 5205 int len = (int)strlen(buf); 5206 char *p = &buf[len]; 5207 5208 jio_snprintf(p, buflen-len, 5209 "\n\n" 5210 "Do you want to debug the problem?\n\n" 5211 "To debug, run 'dbx - %d'; then switch to thread " INTX_FORMAT "\n" 5212 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n" 5213 "Otherwise, press RETURN to abort...", 5214 os::current_process_id(), os::current_thread_id()); 5215 5216 bool yes = os::message_box("Unexpected Error", buf); 5217 5218 if (yes) { 5219 // yes, user asked VM to launch debugger 5220 jio_snprintf(buf, sizeof(buf), "dbx - %d", os::current_process_id()); 5221 5222 os::fork_and_exec(buf); 5223 yes = false; 5224 } 5225 return yes; 5226 }