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 #ifndef PRODUCT 1151 fdStream out(defaultStream::output_fd()); 1152 out.print_raw("Current thread is "); 1153 char buf[16]; 1154 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); 1155 out.print_raw_cr(buf); 1156 out.print_raw_cr("Dumping core ..."); 1157 #endif 1158 ::abort(); // dump core (for debugging) 1159 } 1160 1161 ::exit(1); 1162 } 1163 1164 // Die immediately, no exit hook, no abort hook, no cleanup. 1165 // Dump a core file, if possible, for debugging. 1166 void os::die() { 1167 if (TestUnresponsiveErrorHandler && !CreateCoredumpOnCrash) { 1168 // For TimeoutInErrorHandlingTest.java, we just kill the VM 1169 // and don't take the time to generate a core file. 1170 os::signal_raise(SIGKILL); 1171 } else { 1172 ::abort(); 1173 } 1174 } 1175 1176 // DLL functions 1177 1178 const char* os::dll_file_extension() { return ".so"; } 1179 1180 // This must be hard coded because it's the system's temporary 1181 // directory not the java application's temp directory, ala java.io.tmpdir. 1182 const char* os::get_temp_directory() { return "/tmp"; } 1183 1184 // check if addr is inside libjvm.so 1185 bool os::address_is_in_vm(address addr) { 1186 static address libjvm_base_addr; 1187 Dl_info dlinfo; 1188 1189 if (libjvm_base_addr == NULL) { 1190 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) { 1191 libjvm_base_addr = (address)dlinfo.dli_fbase; 1192 } 1193 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); 1194 } 1195 1196 if (dladdr((void *)addr, &dlinfo) != 0) { 1197 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; 1198 } 1199 1200 return false; 1201 } 1202 1203 typedef int (*dladdr1_func_type)(void *, Dl_info *, void **, int); 1204 static dladdr1_func_type dladdr1_func = NULL; 1205 1206 bool os::dll_address_to_function_name(address addr, char *buf, 1207 int buflen, int * offset, 1208 bool demangle) { 1209 // buf is not optional, but offset is optional 1210 assert(buf != NULL, "sanity check"); 1211 1212 Dl_info dlinfo; 1213 1214 // dladdr1_func was initialized in os::init() 1215 if (dladdr1_func != NULL) { 1216 // yes, we have dladdr1 1217 1218 // Support for dladdr1 is checked at runtime; it may be 1219 // available even if the vm is built on a machine that does 1220 // not have dladdr1 support. Make sure there is a value for 1221 // RTLD_DL_SYMENT. 1222 #ifndef RTLD_DL_SYMENT 1223 #define RTLD_DL_SYMENT 1 1224 #endif 1225 #ifdef _LP64 1226 Elf64_Sym * info; 1227 #else 1228 Elf32_Sym * info; 1229 #endif 1230 if (dladdr1_func((void *)addr, &dlinfo, (void **)&info, 1231 RTLD_DL_SYMENT) != 0) { 1232 // see if we have a matching symbol that covers our address 1233 if (dlinfo.dli_saddr != NULL && 1234 (char *)dlinfo.dli_saddr + info->st_size > (char *)addr) { 1235 if (dlinfo.dli_sname != NULL) { 1236 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) { 1237 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); 1238 } 1239 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1240 return true; 1241 } 1242 } 1243 // no matching symbol so try for just file info 1244 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { 1245 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1246 buf, buflen, offset, dlinfo.dli_fname, demangle)) { 1247 return true; 1248 } 1249 } 1250 } 1251 buf[0] = '\0'; 1252 if (offset != NULL) *offset = -1; 1253 return false; 1254 } 1255 1256 // no, only dladdr is available 1257 if (dladdr((void *)addr, &dlinfo) != 0) { 1258 // see if we have a matching symbol 1259 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) { 1260 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) { 1261 jio_snprintf(buf, buflen, dlinfo.dli_sname); 1262 } 1263 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1264 return true; 1265 } 1266 // no matching symbol so try for just file info 1267 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { 1268 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1269 buf, buflen, offset, dlinfo.dli_fname, demangle)) { 1270 return true; 1271 } 1272 } 1273 } 1274 buf[0] = '\0'; 1275 if (offset != NULL) *offset = -1; 1276 return false; 1277 } 1278 1279 bool os::dll_address_to_library_name(address addr, char* buf, 1280 int buflen, int* offset) { 1281 // buf is not optional, but offset is optional 1282 assert(buf != NULL, "sanity check"); 1283 1284 Dl_info dlinfo; 1285 1286 if (dladdr((void*)addr, &dlinfo) != 0) { 1287 if (dlinfo.dli_fname != NULL) { 1288 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); 1289 } 1290 if (dlinfo.dli_fbase != NULL && offset != NULL) { 1291 *offset = addr - (address)dlinfo.dli_fbase; 1292 } 1293 return true; 1294 } 1295 1296 buf[0] = '\0'; 1297 if (offset) *offset = -1; 1298 return false; 1299 } 1300 1301 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) { 1302 Dl_info dli; 1303 // Sanity check? 1304 if (dladdr(CAST_FROM_FN_PTR(void *, os::get_loaded_modules_info), &dli) == 0 || 1305 dli.dli_fname == NULL) { 1306 return 1; 1307 } 1308 1309 void * handle = dlopen(dli.dli_fname, RTLD_LAZY); 1310 if (handle == NULL) { 1311 return 1; 1312 } 1313 1314 Link_map *map; 1315 dlinfo(handle, RTLD_DI_LINKMAP, &map); 1316 if (map == NULL) { 1317 dlclose(handle); 1318 return 1; 1319 } 1320 1321 while (map->l_prev != NULL) { 1322 map = map->l_prev; 1323 } 1324 1325 while (map != NULL) { 1326 // Iterate through all map entries and call callback with fields of interest 1327 if(callback(map->l_name, (address)map->l_addr, (address)0, param)) { 1328 dlclose(handle); 1329 return 1; 1330 } 1331 map = map->l_next; 1332 } 1333 1334 dlclose(handle); 1335 return 0; 1336 } 1337 1338 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) { 1339 outputStream * out = (outputStream *) param; 1340 out->print_cr(PTR_FORMAT " \t%s", base_address, name); 1341 return 0; 1342 } 1343 1344 void os::print_dll_info(outputStream * st) { 1345 st->print_cr("Dynamic libraries:"); st->flush(); 1346 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) { 1347 st->print_cr("Error: Cannot print dynamic libraries."); 1348 } 1349 } 1350 1351 static void change_endianness(Elf32_Half& val) { 1352 unsigned char *ptr = (unsigned char *)&val; 1353 unsigned char swp = ptr[0]; 1354 ptr[0] = ptr[1]; 1355 ptr[1] = swp; 1356 } 1357 1358 // Loads .dll/.so and 1359 // in case of error it checks if .dll/.so was built for the 1360 // same architecture as Hotspot is running on 1361 1362 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { 1363 log_info(os)("attempting shared library load of %s", filename); 1364 1365 void * result= ::dlopen(filename, RTLD_LAZY); 1366 if (result != NULL) { 1367 // Successful loading 1368 Events::log(NULL, "Loaded shared library %s", filename); 1369 log_info(os)("shared library load of %s was successful", filename); 1370 return result; 1371 } 1372 1373 Elf32_Ehdr elf_head; 1374 const char* error_report = ::dlerror(); 1375 if (error_report == NULL) { 1376 error_report = "dlerror returned no error description"; 1377 } 1378 if (ebuf != NULL && ebuflen > 0) { 1379 ::strncpy(ebuf, error_report, ebuflen-1); 1380 ebuf[ebuflen-1]='\0'; 1381 } 1382 1383 Events::log(NULL, "Loading shared library %s failed, %s", filename, error_report); 1384 log_info(os)("shared library load of %s failed, %s", filename, error_report); 1385 1386 int diag_msg_max_length=ebuflen-strlen(ebuf); 1387 char* diag_msg_buf=ebuf+strlen(ebuf); 1388 1389 if (diag_msg_max_length==0) { 1390 // No more space in ebuf for additional diagnostics message 1391 return NULL; 1392 } 1393 1394 1395 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); 1396 1397 if (file_descriptor < 0) { 1398 // Can't open library, report dlerror() message 1399 return NULL; 1400 } 1401 1402 bool failed_to_read_elf_head= 1403 (sizeof(elf_head)!= 1404 (::read(file_descriptor, &elf_head,sizeof(elf_head)))); 1405 1406 ::close(file_descriptor); 1407 if (failed_to_read_elf_head) { 1408 // file i/o error - report dlerror() msg 1409 return NULL; 1410 } 1411 1412 if (elf_head.e_ident[EI_DATA] != LITTLE_ENDIAN_ONLY(ELFDATA2LSB) BIG_ENDIAN_ONLY(ELFDATA2MSB)) { 1413 // handle invalid/out of range endianness values 1414 if (elf_head.e_ident[EI_DATA] == 0 || elf_head.e_ident[EI_DATA] > 2) { 1415 return NULL; 1416 } 1417 change_endianness(elf_head.e_machine); 1418 } 1419 1420 typedef struct { 1421 Elf32_Half code; // Actual value as defined in elf.h 1422 Elf32_Half compat_class; // Compatibility of archs at VM's sense 1423 unsigned char elf_class; // 32 or 64 bit 1424 unsigned char endianess; // MSB or LSB 1425 char* name; // String representation 1426 } arch_t; 1427 1428 static const arch_t arch_array[]={ 1429 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1430 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1431 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, 1432 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, 1433 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1434 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1435 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, 1436 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, 1437 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, 1438 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"}, 1439 // we only support 64 bit z architecture 1440 {EM_S390, EM_S390, ELFCLASS64, ELFDATA2MSB, (char*)"IBM System/390"}, 1441 {EM_AARCH64, EM_AARCH64, ELFCLASS64, ELFDATA2LSB, (char*)"AARCH64"} 1442 }; 1443 1444 #if (defined IA32) 1445 static Elf32_Half running_arch_code=EM_386; 1446 #elif (defined AMD64) 1447 static Elf32_Half running_arch_code=EM_X86_64; 1448 #elif (defined IA64) 1449 static Elf32_Half running_arch_code=EM_IA_64; 1450 #elif (defined __sparc) && (defined _LP64) 1451 static Elf32_Half running_arch_code=EM_SPARCV9; 1452 #elif (defined __sparc) && (!defined _LP64) 1453 static Elf32_Half running_arch_code=EM_SPARC; 1454 #elif (defined __powerpc64__) 1455 static Elf32_Half running_arch_code=EM_PPC64; 1456 #elif (defined __powerpc__) 1457 static Elf32_Half running_arch_code=EM_PPC; 1458 #elif (defined ARM) 1459 static Elf32_Half running_arch_code=EM_ARM; 1460 #else 1461 #error Method os::dll_load requires that one of following is defined:\ 1462 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, ARM 1463 #endif 1464 1465 // Identify compatibility class for VM's architecture and library's architecture 1466 // Obtain string descriptions for architectures 1467 1468 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; 1469 int running_arch_index=-1; 1470 1471 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) { 1472 if (running_arch_code == arch_array[i].code) { 1473 running_arch_index = i; 1474 } 1475 if (lib_arch.code == arch_array[i].code) { 1476 lib_arch.compat_class = arch_array[i].compat_class; 1477 lib_arch.name = arch_array[i].name; 1478 } 1479 } 1480 1481 assert(running_arch_index != -1, 1482 "Didn't find running architecture code (running_arch_code) in arch_array"); 1483 if (running_arch_index == -1) { 1484 // Even though running architecture detection failed 1485 // we may still continue with reporting dlerror() message 1486 return NULL; 1487 } 1488 1489 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { 1490 if (lib_arch.name != NULL) { 1491 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1492 " (Possible cause: can't load %s .so on a %s platform)", 1493 lib_arch.name, arch_array[running_arch_index].name); 1494 } else { 1495 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1496 " (Possible cause: can't load this .so (machine code=0x%x) on a %s platform)", 1497 lib_arch.code, arch_array[running_arch_index].name); 1498 } 1499 return NULL; 1500 } 1501 1502 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { 1503 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); 1504 return NULL; 1505 } 1506 1507 // ELF file class/capacity : 0 - invalid, 1 - 32bit, 2 - 64bit 1508 if (lib_arch.elf_class > 2 || lib_arch.elf_class < 1) { 1509 ::snprintf(diag_msg_buf, diag_msg_max_length-1, " (Possible cause: invalid ELF file class)"); 1510 return NULL; 1511 } 1512 1513 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { 1514 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1515 " (Possible cause: architecture word width mismatch, can't load %d-bit .so on a %d-bit platform)", 1516 (int) lib_arch.elf_class * 32, arch_array[running_arch_index].elf_class * 32); 1517 return NULL; 1518 } 1519 1520 return NULL; 1521 } 1522 1523 void* os::dll_lookup(void* handle, const char* name) { 1524 return dlsym(handle, name); 1525 } 1526 1527 void* os::get_default_process_handle() { 1528 return (void*)::dlopen(NULL, RTLD_LAZY); 1529 } 1530 1531 static inline time_t get_mtime(const char* filename) { 1532 struct stat st; 1533 int ret = os::stat(filename, &st); 1534 assert(ret == 0, "failed to stat() file '%s': %s", filename, os::strerror(errno)); 1535 return st.st_mtime; 1536 } 1537 1538 int os::compare_file_modified_times(const char* file1, const char* file2) { 1539 time_t t1 = get_mtime(file1); 1540 time_t t2 = get_mtime(file2); 1541 return t1 - t2; 1542 } 1543 1544 static bool _print_ascii_file(const char* filename, outputStream* st) { 1545 int fd = ::open(filename, O_RDONLY); 1546 if (fd == -1) { 1547 return false; 1548 } 1549 1550 char buf[32]; 1551 int bytes; 1552 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { 1553 st->print_raw(buf, bytes); 1554 } 1555 1556 ::close(fd); 1557 1558 return true; 1559 } 1560 1561 void os::print_os_info_brief(outputStream* st) { 1562 os::Solaris::print_distro_info(st); 1563 1564 os::Posix::print_uname_info(st); 1565 1566 os::Solaris::print_libversion_info(st); 1567 } 1568 1569 void os::print_os_info(outputStream* st) { 1570 st->print("OS:"); 1571 1572 os::Solaris::print_distro_info(st); 1573 1574 os::Posix::print_uname_info(st); 1575 1576 os::Posix::print_uptime_info(st); 1577 1578 os::Solaris::print_libversion_info(st); 1579 1580 os::Posix::print_rlimit_info(st); 1581 1582 os::Posix::print_load_average(st); 1583 } 1584 1585 void os::Solaris::print_distro_info(outputStream* st) { 1586 if (!_print_ascii_file("/etc/release", st)) { 1587 st->print("Solaris"); 1588 } 1589 st->cr(); 1590 } 1591 1592 void os::get_summary_os_info(char* buf, size_t buflen) { 1593 strncpy(buf, "Solaris", buflen); // default to plain solaris 1594 FILE* fp = fopen("/etc/release", "r"); 1595 if (fp != NULL) { 1596 char tmp[256]; 1597 // Only get the first line and chop out everything but the os name. 1598 if (fgets(tmp, sizeof(tmp), fp)) { 1599 char* ptr = tmp; 1600 // skip past whitespace characters 1601 while (*ptr != '\0' && (*ptr == ' ' || *ptr == '\t' || *ptr == '\n')) ptr++; 1602 if (*ptr != '\0') { 1603 char* nl = strchr(ptr, '\n'); 1604 if (nl != NULL) *nl = '\0'; 1605 strncpy(buf, ptr, buflen); 1606 } 1607 } 1608 fclose(fp); 1609 } 1610 } 1611 1612 void os::Solaris::print_libversion_info(outputStream* st) { 1613 st->print(" (T2 libthread)"); 1614 st->cr(); 1615 } 1616 1617 static bool check_addr0(outputStream* st) { 1618 jboolean status = false; 1619 const int read_chunk = 200; 1620 int ret = 0; 1621 int nmap = 0; 1622 int fd = ::open("/proc/self/map",O_RDONLY); 1623 if (fd >= 0) { 1624 prmap_t *p = NULL; 1625 char *mbuff = (char *) calloc(read_chunk, sizeof(prmap_t)); 1626 if (NULL == mbuff) { 1627 ::close(fd); 1628 return status; 1629 } 1630 while ((ret = ::read(fd, mbuff, read_chunk*sizeof(prmap_t))) > 0) { 1631 //check if read() has not read partial data 1632 if( 0 != ret % sizeof(prmap_t)){ 1633 break; 1634 } 1635 nmap = ret / sizeof(prmap_t); 1636 p = (prmap_t *)mbuff; 1637 for(int i = 0; i < nmap; i++){ 1638 if (p->pr_vaddr == 0x0) { 1639 st->print("Warning: Address: " PTR_FORMAT ", Size: " SIZE_FORMAT "K, ",p->pr_vaddr, p->pr_size/1024); 1640 st->print("Mapped file: %s, ", p->pr_mapname[0] == '\0' ? "None" : p->pr_mapname); 1641 st->print("Access: "); 1642 st->print("%s",(p->pr_mflags & MA_READ) ? "r" : "-"); 1643 st->print("%s",(p->pr_mflags & MA_WRITE) ? "w" : "-"); 1644 st->print("%s",(p->pr_mflags & MA_EXEC) ? "x" : "-"); 1645 st->cr(); 1646 status = true; 1647 } 1648 p++; 1649 } 1650 } 1651 free(mbuff); 1652 ::close(fd); 1653 } 1654 return status; 1655 } 1656 1657 void os::get_summary_cpu_info(char* buf, size_t buflen) { 1658 // Get MHz with system call. We don't seem to already have this. 1659 processor_info_t stats; 1660 processorid_t id = getcpuid(); 1661 int clock = 0; 1662 if (processor_info(id, &stats) != -1) { 1663 clock = stats.pi_clock; // pi_processor_type isn't more informative than below 1664 } 1665 #ifdef AMD64 1666 snprintf(buf, buflen, "x86 64 bit %d MHz", clock); 1667 #else 1668 // must be sparc 1669 snprintf(buf, buflen, "Sparcv9 64 bit %d MHz", clock); 1670 #endif 1671 } 1672 1673 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) { 1674 // Nothing to do for now. 1675 } 1676 1677 void os::print_memory_info(outputStream* st) { 1678 st->print("Memory:"); 1679 st->print(" %dk page", os::vm_page_size()>>10); 1680 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10); 1681 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10); 1682 st->cr(); 1683 (void) check_addr0(st); 1684 } 1685 1686 // Moved from whole group, because we need them here for diagnostic 1687 // prints. 1688 static int Maxsignum = 0; 1689 static int *ourSigFlags = NULL; 1690 1691 int os::Solaris::get_our_sigflags(int sig) { 1692 assert(ourSigFlags!=NULL, "signal data structure not initialized"); 1693 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range"); 1694 return ourSigFlags[sig]; 1695 } 1696 1697 void os::Solaris::set_our_sigflags(int sig, int flags) { 1698 assert(ourSigFlags!=NULL, "signal data structure not initialized"); 1699 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range"); 1700 ourSigFlags[sig] = flags; 1701 } 1702 1703 1704 static const char* get_signal_handler_name(address handler, 1705 char* buf, int buflen) { 1706 int offset; 1707 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 1708 if (found) { 1709 // skip directory names 1710 const char *p1, *p2; 1711 p1 = buf; 1712 size_t len = strlen(os::file_separator()); 1713 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 1714 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); 1715 } else { 1716 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 1717 } 1718 return buf; 1719 } 1720 1721 static void print_signal_handler(outputStream* st, int sig, 1722 char* buf, size_t buflen) { 1723 struct sigaction sa; 1724 1725 sigaction(sig, NULL, &sa); 1726 1727 st->print("%s: ", os::exception_name(sig, buf, buflen)); 1728 1729 address handler = (sa.sa_flags & SA_SIGINFO) 1730 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 1731 : CAST_FROM_FN_PTR(address, sa.sa_handler); 1732 1733 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 1734 st->print("SIG_DFL"); 1735 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 1736 st->print("SIG_IGN"); 1737 } else { 1738 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 1739 } 1740 1741 st->print(", sa_mask[0]="); 1742 os::Posix::print_signal_set_short(st, &sa.sa_mask); 1743 1744 address rh = VMError::get_resetted_sighandler(sig); 1745 // May be, handler was resetted by VMError? 1746 if (rh != NULL) { 1747 handler = rh; 1748 sa.sa_flags = VMError::get_resetted_sigflags(sig); 1749 } 1750 1751 st->print(", sa_flags="); 1752 os::Posix::print_sa_flags(st, sa.sa_flags); 1753 1754 // Check: is it our handler? 1755 if (handler == CAST_FROM_FN_PTR(address, signalHandler)) { 1756 // It is our signal handler 1757 // check for flags 1758 if (sa.sa_flags != os::Solaris::get_our_sigflags(sig)) { 1759 st->print( 1760 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", 1761 os::Solaris::get_our_sigflags(sig)); 1762 } 1763 } 1764 st->cr(); 1765 } 1766 1767 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1768 st->print_cr("Signal Handlers:"); 1769 print_signal_handler(st, SIGSEGV, buf, buflen); 1770 print_signal_handler(st, SIGBUS , buf, buflen); 1771 print_signal_handler(st, SIGFPE , buf, buflen); 1772 print_signal_handler(st, SIGPIPE, buf, buflen); 1773 print_signal_handler(st, SIGXFSZ, buf, buflen); 1774 print_signal_handler(st, SIGILL , buf, buflen); 1775 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen); 1776 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); 1777 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen); 1778 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); 1779 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen); 1780 } 1781 1782 static char saved_jvm_path[MAXPATHLEN] = { 0 }; 1783 1784 // Find the full path to the current module, libjvm.so 1785 void os::jvm_path(char *buf, jint buflen) { 1786 // Error checking. 1787 if (buflen < MAXPATHLEN) { 1788 assert(false, "must use a large-enough buffer"); 1789 buf[0] = '\0'; 1790 return; 1791 } 1792 // Lazy resolve the path to current module. 1793 if (saved_jvm_path[0] != 0) { 1794 strcpy(buf, saved_jvm_path); 1795 return; 1796 } 1797 1798 Dl_info dlinfo; 1799 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo); 1800 assert(ret != 0, "cannot locate libjvm"); 1801 if (ret != 0 && dlinfo.dli_fname != NULL) { 1802 if (os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen) == NULL) { 1803 return; 1804 } 1805 } else { 1806 buf[0] = '\0'; 1807 return; 1808 } 1809 1810 if (Arguments::sun_java_launcher_is_altjvm()) { 1811 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical 1812 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so". 1813 // If "/jre/lib/" appears at the right place in the string, then 1814 // assume we are installed in a JDK and we're done. Otherwise, check 1815 // for a JAVA_HOME environment variable and fix up the path so it 1816 // looks like libjvm.so is installed there (append a fake suffix 1817 // hotspot/libjvm.so). 1818 const char *p = buf + strlen(buf) - 1; 1819 for (int count = 0; p > buf && count < 5; ++count) { 1820 for (--p; p > buf && *p != '/'; --p) 1821 /* empty */ ; 1822 } 1823 1824 if (strncmp(p, "/jre/lib/", 9) != 0) { 1825 // Look for JAVA_HOME in the environment. 1826 char* java_home_var = ::getenv("JAVA_HOME"); 1827 if (java_home_var != NULL && java_home_var[0] != 0) { 1828 char* jrelib_p; 1829 int len; 1830 1831 // Check the current module name "libjvm.so". 1832 p = strrchr(buf, '/'); 1833 assert(strstr(p, "/libjvm") == p, "invalid library name"); 1834 1835 if (os::Posix::realpath(java_home_var, buf, buflen) == NULL) { 1836 return; 1837 } 1838 // determine if this is a legacy image or modules image 1839 // modules image doesn't have "jre" subdirectory 1840 len = strlen(buf); 1841 assert(len < buflen, "Ran out of buffer space"); 1842 jrelib_p = buf + len; 1843 snprintf(jrelib_p, buflen-len, "/jre/lib"); 1844 if (0 != access(buf, F_OK)) { 1845 snprintf(jrelib_p, buflen-len, "/lib"); 1846 } 1847 1848 if (0 == access(buf, F_OK)) { 1849 // Use current module name "libjvm.so" 1850 len = strlen(buf); 1851 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so"); 1852 } else { 1853 // Go back to path of .so 1854 if (os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen) == NULL) { 1855 return; 1856 } 1857 } 1858 } 1859 } 1860 } 1861 1862 strncpy(saved_jvm_path, buf, MAXPATHLEN); 1863 saved_jvm_path[MAXPATHLEN - 1] = '\0'; 1864 } 1865 1866 1867 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1868 // no prefix required, not even "_" 1869 } 1870 1871 1872 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1873 // no suffix required 1874 } 1875 1876 // sun.misc.Signal 1877 1878 extern "C" { 1879 static void UserHandler(int sig, void *siginfo, void *context) { 1880 // Ctrl-C is pressed during error reporting, likely because the error 1881 // handler fails to abort. Let VM die immediately. 1882 if (sig == SIGINT && VMError::is_error_reported()) { 1883 os::die(); 1884 } 1885 1886 os::signal_notify(sig); 1887 // We do not need to reinstate the signal handler each time... 1888 } 1889 } 1890 1891 void* os::user_handler() { 1892 return CAST_FROM_FN_PTR(void*, UserHandler); 1893 } 1894 1895 extern "C" { 1896 typedef void (*sa_handler_t)(int); 1897 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); 1898 } 1899 1900 void* os::signal(int signal_number, void* handler) { 1901 struct sigaction sigAct, oldSigAct; 1902 sigfillset(&(sigAct.sa_mask)); 1903 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND; 1904 sigAct.sa_flags |= SA_SIGINFO; 1905 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); 1906 1907 if (sigaction(signal_number, &sigAct, &oldSigAct)) { 1908 // -1 means registration failed 1909 return (void *)-1; 1910 } 1911 1912 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); 1913 } 1914 1915 void os::signal_raise(int signal_number) { 1916 raise(signal_number); 1917 } 1918 1919 // The following code is moved from os.cpp for making this 1920 // code platform specific, which it is by its very nature. 1921 1922 // a counter for each possible signal value 1923 static int Sigexit = 0; 1924 static jint *pending_signals = NULL; 1925 static int *preinstalled_sigs = NULL; 1926 static struct sigaction *chainedsigactions = NULL; 1927 static Semaphore* sig_sem = NULL; 1928 1929 int os::sigexitnum_pd() { 1930 assert(Sigexit > 0, "signal memory not yet initialized"); 1931 return Sigexit; 1932 } 1933 1934 void os::Solaris::init_signal_mem() { 1935 // Initialize signal structures 1936 Maxsignum = SIGRTMAX; 1937 Sigexit = Maxsignum+1; 1938 assert(Maxsignum >0, "Unable to obtain max signal number"); 1939 1940 // Initialize signal structures 1941 // pending_signals has one int per signal 1942 // The additional signal is for SIGEXIT - exit signal to signal_thread 1943 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal); 1944 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1))); 1945 1946 if (UseSignalChaining) { 1947 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction) 1948 * (Maxsignum + 1), mtInternal); 1949 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1))); 1950 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1), mtInternal); 1951 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1))); 1952 } 1953 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1), mtInternal); 1954 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1)); 1955 } 1956 1957 static void jdk_misc_signal_init() { 1958 // Initialize signal semaphore 1959 sig_sem = new Semaphore(); 1960 } 1961 1962 void os::signal_notify(int sig) { 1963 if (sig_sem != NULL) { 1964 Atomic::inc(&pending_signals[sig]); 1965 sig_sem->signal(); 1966 } else { 1967 // Signal thread is not created with ReduceSignalUsage and jdk_misc_signal_init 1968 // initialization isn't called. 1969 assert(ReduceSignalUsage, "signal semaphore should be created"); 1970 } 1971 } 1972 1973 static int check_pending_signals() { 1974 int ret; 1975 while (true) { 1976 for (int i = 0; i < Sigexit + 1; i++) { 1977 jint n = pending_signals[i]; 1978 if (n > 0 && n == Atomic::cmpxchg(&pending_signals[i], n, n - 1)) { 1979 return i; 1980 } 1981 } 1982 JavaThread *thread = JavaThread::current(); 1983 ThreadBlockInVM tbivm(thread); 1984 1985 bool threadIsSuspended; 1986 do { 1987 thread->set_suspend_equivalent(); 1988 sig_sem->wait(); 1989 1990 // were we externally suspended while we were waiting? 1991 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 1992 if (threadIsSuspended) { 1993 // The semaphore has been incremented, but while we were waiting 1994 // another thread suspended us. We don't want to continue running 1995 // while suspended because that would surprise the thread that 1996 // suspended us. 1997 sig_sem->signal(); 1998 1999 thread->java_suspend_self(); 2000 } 2001 } while (threadIsSuspended); 2002 } 2003 } 2004 2005 int os::signal_wait() { 2006 return check_pending_signals(); 2007 } 2008 2009 //////////////////////////////////////////////////////////////////////////////// 2010 // Virtual Memory 2011 2012 static int page_size = -1; 2013 2014 int os::vm_page_size() { 2015 assert(page_size != -1, "must call os::init"); 2016 return page_size; 2017 } 2018 2019 // Solaris allocates memory by pages. 2020 int os::vm_allocation_granularity() { 2021 assert(page_size != -1, "must call os::init"); 2022 return page_size; 2023 } 2024 2025 static bool recoverable_mmap_error(int err) { 2026 // See if the error is one we can let the caller handle. This 2027 // list of errno values comes from the Solaris mmap(2) man page. 2028 switch (err) { 2029 case EBADF: 2030 case EINVAL: 2031 case ENOTSUP: 2032 // let the caller deal with these errors 2033 return true; 2034 2035 default: 2036 // Any remaining errors on this OS can cause our reserved mapping 2037 // to be lost. That can cause confusion where different data 2038 // structures think they have the same memory mapped. The worst 2039 // scenario is if both the VM and a library think they have the 2040 // same memory mapped. 2041 return false; 2042 } 2043 } 2044 2045 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec, 2046 int err) { 2047 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 2048 ", %d) failed; error='%s' (errno=%d)", addr, bytes, exec, 2049 os::strerror(err), err); 2050 } 2051 2052 static void warn_fail_commit_memory(char* addr, size_t bytes, 2053 size_t alignment_hint, bool exec, 2054 int err) { 2055 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 2056 ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, bytes, 2057 alignment_hint, exec, os::strerror(err), err); 2058 } 2059 2060 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, bool exec) { 2061 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; 2062 size_t size = bytes; 2063 char *res = Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot); 2064 if (res != NULL) { 2065 if (UseNUMAInterleaving) { 2066 numa_make_global(addr, bytes); 2067 } 2068 return 0; 2069 } 2070 2071 int err = errno; // save errno from mmap() call in mmap_chunk() 2072 2073 if (!recoverable_mmap_error(err)) { 2074 warn_fail_commit_memory(addr, bytes, exec, err); 2075 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "committing reserved memory."); 2076 } 2077 2078 return err; 2079 } 2080 2081 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) { 2082 return Solaris::commit_memory_impl(addr, bytes, exec) == 0; 2083 } 2084 2085 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, bool exec, 2086 const char* mesg) { 2087 assert(mesg != NULL, "mesg must be specified"); 2088 int err = os::Solaris::commit_memory_impl(addr, bytes, exec); 2089 if (err != 0) { 2090 // the caller wants all commit errors to exit with the specified mesg: 2091 warn_fail_commit_memory(addr, bytes, exec, err); 2092 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg); 2093 } 2094 } 2095 2096 size_t os::Solaris::page_size_for_alignment(size_t alignment) { 2097 assert(is_aligned(alignment, (size_t) vm_page_size()), 2098 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, 2099 alignment, (size_t) vm_page_size()); 2100 2101 for (int i = 0; _page_sizes[i] != 0; i++) { 2102 if (is_aligned(alignment, _page_sizes[i])) { 2103 return _page_sizes[i]; 2104 } 2105 } 2106 2107 return (size_t) vm_page_size(); 2108 } 2109 2110 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, 2111 size_t alignment_hint, bool exec) { 2112 int err = Solaris::commit_memory_impl(addr, bytes, exec); 2113 if (err == 0 && UseLargePages && alignment_hint > 0) { 2114 assert(is_aligned(bytes, alignment_hint), 2115 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, alignment_hint); 2116 2117 // The syscall memcntl requires an exact page size (see man memcntl for details). 2118 size_t page_size = page_size_for_alignment(alignment_hint); 2119 if (page_size > (size_t) vm_page_size()) { 2120 (void)Solaris::setup_large_pages(addr, bytes, page_size); 2121 } 2122 } 2123 return err; 2124 } 2125 2126 bool os::pd_commit_memory(char* addr, size_t bytes, size_t alignment_hint, 2127 bool exec) { 2128 return Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec) == 0; 2129 } 2130 2131 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, 2132 size_t alignment_hint, bool exec, 2133 const char* mesg) { 2134 assert(mesg != NULL, "mesg must be specified"); 2135 int err = os::Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec); 2136 if (err != 0) { 2137 // the caller wants all commit errors to exit with the specified mesg: 2138 warn_fail_commit_memory(addr, bytes, alignment_hint, exec, err); 2139 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg); 2140 } 2141 } 2142 2143 // Uncommit the pages in a specified region. 2144 void os::pd_free_memory(char* addr, size_t bytes, size_t alignment_hint) { 2145 if (madvise(addr, bytes, MADV_FREE) < 0) { 2146 debug_only(warning("MADV_FREE failed.")); 2147 return; 2148 } 2149 } 2150 2151 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 2152 return os::commit_memory(addr, size, !ExecMem); 2153 } 2154 2155 bool os::remove_stack_guard_pages(char* addr, size_t size) { 2156 return os::uncommit_memory(addr, size); 2157 } 2158 2159 // Change the page size in a given range. 2160 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 2161 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned."); 2162 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned."); 2163 if (UseLargePages) { 2164 size_t page_size = Solaris::page_size_for_alignment(alignment_hint); 2165 if (page_size > (size_t) vm_page_size()) { 2166 Solaris::setup_large_pages(addr, bytes, page_size); 2167 } 2168 } 2169 } 2170 2171 // Tell the OS to make the range local to the first-touching LWP 2172 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { 2173 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned."); 2174 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) { 2175 debug_only(warning("MADV_ACCESS_LWP failed.")); 2176 } 2177 } 2178 2179 // Tell the OS that this range would be accessed from different LWPs. 2180 void os::numa_make_global(char *addr, size_t bytes) { 2181 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned."); 2182 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) { 2183 debug_only(warning("MADV_ACCESS_MANY failed.")); 2184 } 2185 } 2186 2187 // Get the number of the locality groups. 2188 size_t os::numa_get_groups_num() { 2189 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie()); 2190 return n != -1 ? n : 1; 2191 } 2192 2193 // Get a list of leaf locality groups. A leaf lgroup is group that 2194 // doesn't have any children. Typical leaf group is a CPU or a CPU/memory 2195 // board. An LWP is assigned to one of these groups upon creation. 2196 size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2197 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) { 2198 ids[0] = 0; 2199 return 1; 2200 } 2201 int result_size = 0, top = 1, bottom = 0, cur = 0; 2202 for (int k = 0; k < size; k++) { 2203 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur], 2204 (Solaris::lgrp_id_t*)&ids[top], size - top); 2205 if (r == -1) { 2206 ids[0] = 0; 2207 return 1; 2208 } 2209 if (!r) { 2210 // That's a leaf node. 2211 assert(bottom <= cur, "Sanity check"); 2212 // Check if the node has memory 2213 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur], 2214 NULL, 0, LGRP_RSRC_MEM) > 0) { 2215 ids[bottom++] = ids[cur]; 2216 } 2217 } 2218 top += r; 2219 cur++; 2220 } 2221 if (bottom == 0) { 2222 // Handle a situation, when the OS reports no memory available. 2223 // Assume UMA architecture. 2224 ids[0] = 0; 2225 return 1; 2226 } 2227 return bottom; 2228 } 2229 2230 // Detect the topology change. Typically happens during CPU plugging-unplugging. 2231 bool os::numa_topology_changed() { 2232 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie()); 2233 if (is_stale != -1 && is_stale) { 2234 Solaris::lgrp_fini(Solaris::lgrp_cookie()); 2235 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER); 2236 assert(c != 0, "Failure to initialize LGRP API"); 2237 Solaris::set_lgrp_cookie(c); 2238 return true; 2239 } 2240 return false; 2241 } 2242 2243 // Get the group id of the current LWP. 2244 int os::numa_get_group_id() { 2245 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID); 2246 if (lgrp_id == -1) { 2247 return 0; 2248 } 2249 const int size = os::numa_get_groups_num(); 2250 int *ids = (int*)alloca(size * sizeof(int)); 2251 2252 // Get the ids of all lgroups with memory; r is the count. 2253 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id, 2254 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM); 2255 if (r <= 0) { 2256 return 0; 2257 } 2258 return ids[os::random() % r]; 2259 } 2260 2261 int os::numa_get_group_id_for_address(const void* address) { 2262 return 0; 2263 } 2264 2265 // Request information about the page. 2266 bool os::get_page_info(char *start, page_info* info) { 2267 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE }; 2268 uint64_t addr = (uintptr_t)start; 2269 uint64_t outdata[2]; 2270 uint_t validity = 0; 2271 2272 if (meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) { 2273 return false; 2274 } 2275 2276 info->size = 0; 2277 info->lgrp_id = -1; 2278 2279 if ((validity & 1) != 0) { 2280 if ((validity & 2) != 0) { 2281 info->lgrp_id = outdata[0]; 2282 } 2283 if ((validity & 4) != 0) { 2284 info->size = outdata[1]; 2285 } 2286 return true; 2287 } 2288 return false; 2289 } 2290 2291 // Scan the pages from start to end until a page different than 2292 // the one described in the info parameter is encountered. 2293 char *os::scan_pages(char *start, char* end, page_info* page_expected, 2294 page_info* page_found) { 2295 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE }; 2296 const size_t types = sizeof(info_types) / sizeof(info_types[0]); 2297 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT + 1]; 2298 uint_t validity[MAX_MEMINFO_CNT]; 2299 2300 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size); 2301 uint64_t p = (uint64_t)start; 2302 while (p < (uint64_t)end) { 2303 addrs[0] = p; 2304 size_t addrs_count = 1; 2305 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] + page_size < (uint64_t)end) { 2306 addrs[addrs_count] = addrs[addrs_count - 1] + page_size; 2307 addrs_count++; 2308 } 2309 2310 if (meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) { 2311 return NULL; 2312 } 2313 2314 size_t i = 0; 2315 for (; i < addrs_count; i++) { 2316 if ((validity[i] & 1) != 0) { 2317 if ((validity[i] & 4) != 0) { 2318 if (outdata[types * i + 1] != page_expected->size) { 2319 break; 2320 } 2321 } else if (page_expected->size != 0) { 2322 break; 2323 } 2324 2325 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) { 2326 if (outdata[types * i] != page_expected->lgrp_id) { 2327 break; 2328 } 2329 } 2330 } else { 2331 return NULL; 2332 } 2333 } 2334 2335 if (i < addrs_count) { 2336 if ((validity[i] & 2) != 0) { 2337 page_found->lgrp_id = outdata[types * i]; 2338 } else { 2339 page_found->lgrp_id = -1; 2340 } 2341 if ((validity[i] & 4) != 0) { 2342 page_found->size = outdata[types * i + 1]; 2343 } else { 2344 page_found->size = 0; 2345 } 2346 return (char*)addrs[i]; 2347 } 2348 2349 p = addrs[addrs_count - 1] + page_size; 2350 } 2351 return end; 2352 } 2353 2354 bool os::pd_uncommit_memory(char* addr, size_t bytes) { 2355 size_t size = bytes; 2356 // Map uncommitted pages PROT_NONE so we fail early if we touch an 2357 // uncommitted page. Otherwise, the read/write might succeed if we 2358 // have enough swap space to back the physical page. 2359 return 2360 NULL != Solaris::mmap_chunk(addr, size, 2361 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, 2362 PROT_NONE); 2363 } 2364 2365 char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) { 2366 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0); 2367 2368 if (b == MAP_FAILED) { 2369 return NULL; 2370 } 2371 return b; 2372 } 2373 2374 char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes, 2375 size_t alignment_hint, bool fixed) { 2376 char* addr = requested_addr; 2377 int flags = MAP_PRIVATE | MAP_NORESERVE; 2378 2379 assert(!(fixed && (alignment_hint > 0)), 2380 "alignment hint meaningless with fixed mmap"); 2381 2382 if (fixed) { 2383 flags |= MAP_FIXED; 2384 } else if (alignment_hint > (size_t) vm_page_size()) { 2385 flags |= MAP_ALIGN; 2386 addr = (char*) alignment_hint; 2387 } 2388 2389 // Map uncommitted pages PROT_NONE so we fail early if we touch an 2390 // uncommitted page. Otherwise, the read/write might succeed if we 2391 // have enough swap space to back the physical page. 2392 return mmap_chunk(addr, bytes, flags, PROT_NONE); 2393 } 2394 2395 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, 2396 size_t alignment_hint) { 2397 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint, 2398 (requested_addr != NULL)); 2399 2400 guarantee(requested_addr == NULL || requested_addr == addr, 2401 "OS failed to return requested mmap address."); 2402 return addr; 2403 } 2404 2405 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) { 2406 assert(file_desc >= 0, "file_desc is not valid"); 2407 char* result = pd_attempt_reserve_memory_at(bytes, requested_addr); 2408 if (result != NULL) { 2409 if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) { 2410 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory")); 2411 } 2412 } 2413 return result; 2414 } 2415 2416 // Reserve memory at an arbitrary address, only if that area is 2417 // available (and not reserved for something else). 2418 2419 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2420 // Assert only that the size is a multiple of the page size, since 2421 // that's all that mmap requires, and since that's all we really know 2422 // about at this low abstraction level. If we need higher alignment, 2423 // we can either pass an alignment to this method or verify alignment 2424 // in one of the methods further up the call chain. See bug 5044738. 2425 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); 2426 2427 // Since snv_84, Solaris attempts to honor the address hint - see 5003415. 2428 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false); 2429 2430 volatile int err = errno; 2431 if (addr == requested_addr) { 2432 return addr; 2433 } 2434 2435 if (addr != NULL) { 2436 pd_unmap_memory(addr, bytes); 2437 } 2438 2439 return NULL; 2440 } 2441 2442 bool os::pd_release_memory(char* addr, size_t bytes) { 2443 size_t size = bytes; 2444 return munmap(addr, size) == 0; 2445 } 2446 2447 static bool solaris_mprotect(char* addr, size_t bytes, int prot) { 2448 assert(addr == (char*)align_down((uintptr_t)addr, os::vm_page_size()), 2449 "addr must be page aligned"); 2450 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with protection modes %x", p2i(addr), p2i(addr+bytes), prot); 2451 int retVal = mprotect(addr, bytes, prot); 2452 return retVal == 0; 2453 } 2454 2455 // Protect memory (Used to pass readonly pages through 2456 // JNI GetArray<type>Elements with empty arrays.) 2457 // Also, used for serialization page and for compressed oops null pointer 2458 // checking. 2459 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 2460 bool is_committed) { 2461 unsigned int p = 0; 2462 switch (prot) { 2463 case MEM_PROT_NONE: p = PROT_NONE; break; 2464 case MEM_PROT_READ: p = PROT_READ; break; 2465 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; 2466 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; 2467 default: 2468 ShouldNotReachHere(); 2469 } 2470 // is_committed is unused. 2471 return solaris_mprotect(addr, bytes, p); 2472 } 2473 2474 // guard_memory and unguard_memory only happens within stack guard pages. 2475 // Since ISM pertains only to the heap, guard and unguard memory should not 2476 /// happen with an ISM region. 2477 bool os::guard_memory(char* addr, size_t bytes) { 2478 return solaris_mprotect(addr, bytes, PROT_NONE); 2479 } 2480 2481 bool os::unguard_memory(char* addr, size_t bytes) { 2482 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE); 2483 } 2484 2485 // Large page support 2486 static size_t _large_page_size = 0; 2487 2488 // Insertion sort for small arrays (descending order). 2489 static void insertion_sort_descending(size_t* array, int len) { 2490 for (int i = 0; i < len; i++) { 2491 size_t val = array[i]; 2492 for (size_t key = i; key > 0 && array[key - 1] < val; --key) { 2493 size_t tmp = array[key]; 2494 array[key] = array[key - 1]; 2495 array[key - 1] = tmp; 2496 } 2497 } 2498 } 2499 2500 bool os::Solaris::mpss_sanity_check(bool warn, size_t* page_size) { 2501 const unsigned int usable_count = VM_Version::page_size_count(); 2502 if (usable_count == 1) { 2503 return false; 2504 } 2505 2506 // Find the right getpagesizes interface. When solaris 11 is the minimum 2507 // build platform, getpagesizes() (without the '2') can be called directly. 2508 typedef int (*gps_t)(size_t[], int); 2509 gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2")); 2510 if (gps_func == NULL) { 2511 gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes")); 2512 if (gps_func == NULL) { 2513 if (warn) { 2514 warning("MPSS is not supported by the operating system."); 2515 } 2516 return false; 2517 } 2518 } 2519 2520 // Fill the array of page sizes. 2521 int n = (*gps_func)(_page_sizes, page_sizes_max); 2522 assert(n > 0, "Solaris bug?"); 2523 2524 if (n == page_sizes_max) { 2525 // Add a sentinel value (necessary only if the array was completely filled 2526 // since it is static (zeroed at initialization)). 2527 _page_sizes[--n] = 0; 2528 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");) 2529 } 2530 assert(_page_sizes[n] == 0, "missing sentinel"); 2531 trace_page_sizes("available page sizes", _page_sizes, n); 2532 2533 if (n == 1) return false; // Only one page size available. 2534 2535 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and 2536 // select up to usable_count elements. First sort the array, find the first 2537 // acceptable value, then copy the usable sizes to the top of the array and 2538 // trim the rest. Make sure to include the default page size :-). 2539 // 2540 // A better policy could get rid of the 4M limit by taking the sizes of the 2541 // important VM memory regions (java heap and possibly the code cache) into 2542 // account. 2543 insertion_sort_descending(_page_sizes, n); 2544 const size_t size_limit = 2545 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes; 2546 int beg; 2547 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */; 2548 const int end = MIN2((int)usable_count, n) - 1; 2549 for (int cur = 0; cur < end; ++cur, ++beg) { 2550 _page_sizes[cur] = _page_sizes[beg]; 2551 } 2552 _page_sizes[end] = vm_page_size(); 2553 _page_sizes[end + 1] = 0; 2554 2555 if (_page_sizes[end] > _page_sizes[end - 1]) { 2556 // Default page size is not the smallest; sort again. 2557 insertion_sort_descending(_page_sizes, end + 1); 2558 } 2559 *page_size = _page_sizes[0]; 2560 2561 trace_page_sizes("usable page sizes", _page_sizes, end + 1); 2562 return true; 2563 } 2564 2565 void os::large_page_init() { 2566 if (UseLargePages) { 2567 // print a warning if any large page related flag is specified on command line 2568 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || 2569 !FLAG_IS_DEFAULT(LargePageSizeInBytes); 2570 2571 UseLargePages = Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size); 2572 } 2573 } 2574 2575 bool os::Solaris::is_valid_page_size(size_t bytes) { 2576 for (int i = 0; _page_sizes[i] != 0; i++) { 2577 if (_page_sizes[i] == bytes) { 2578 return true; 2579 } 2580 } 2581 return false; 2582 } 2583 2584 bool os::Solaris::setup_large_pages(caddr_t start, size_t bytes, size_t align) { 2585 assert(is_valid_page_size(align), SIZE_FORMAT " is not a valid page size", align); 2586 assert(is_aligned((void*) start, align), 2587 PTR_FORMAT " is not aligned to " SIZE_FORMAT, p2i((void*) start), align); 2588 assert(is_aligned(bytes, align), 2589 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, align); 2590 2591 // Signal to OS that we want large pages for addresses 2592 // from addr, addr + bytes 2593 struct memcntl_mha mpss_struct; 2594 mpss_struct.mha_cmd = MHA_MAPSIZE_VA; 2595 mpss_struct.mha_pagesize = align; 2596 mpss_struct.mha_flags = 0; 2597 // Upon successful completion, memcntl() returns 0 2598 if (memcntl(start, bytes, MC_HAT_ADVISE, (caddr_t) &mpss_struct, 0, 0)) { 2599 debug_only(warning("Attempt to use MPSS failed.")); 2600 return false; 2601 } 2602 return true; 2603 } 2604 2605 char* os::pd_reserve_memory_special(size_t size, size_t alignment, char* addr, bool exec) { 2606 fatal("os::reserve_memory_special should not be called on Solaris."); 2607 return NULL; 2608 } 2609 2610 bool os::pd_release_memory_special(char* base, size_t bytes) { 2611 fatal("os::release_memory_special should not be called on Solaris."); 2612 return false; 2613 } 2614 2615 size_t os::large_page_size() { 2616 return _large_page_size; 2617 } 2618 2619 // MPSS allows application to commit large page memory on demand; with ISM 2620 // the entire memory region must be allocated as shared memory. 2621 bool os::can_commit_large_page_memory() { 2622 return true; 2623 } 2624 2625 bool os::can_execute_large_page_memory() { 2626 return true; 2627 } 2628 2629 // Sleep forever; naked call to OS-specific sleep; use with CAUTION 2630 void os::infinite_sleep() { 2631 while (true) { // sleep forever ... 2632 ::sleep(100); // ... 100 seconds at a time 2633 } 2634 } 2635 2636 // Used to convert frequent JVM_Yield() to nops 2637 bool os::dont_yield() { 2638 if (DontYieldALot) { 2639 static hrtime_t last_time = 0; 2640 hrtime_t diff = getTimeNanos() - last_time; 2641 2642 if (diff < DontYieldALotInterval * 1000000) { 2643 return true; 2644 } 2645 2646 last_time += diff; 2647 2648 return false; 2649 } else { 2650 return false; 2651 } 2652 } 2653 2654 // Note that yield semantics are defined by the scheduling class to which 2655 // the thread currently belongs. Typically, yield will _not yield to 2656 // other equal or higher priority threads that reside on the dispatch queues 2657 // of other CPUs. 2658 2659 void os::naked_yield() { 2660 thr_yield(); 2661 } 2662 2663 // Interface for setting lwp priorities. We are using T2 libthread, 2664 // which forces the use of bound threads, so all of our threads will 2665 // be assigned to real lwp's. Using the thr_setprio function is 2666 // meaningless in this mode so we must adjust the real lwp's priority. 2667 // The routines below implement the getting and setting of lwp priorities. 2668 // 2669 // Note: There are three priority scales used on Solaris. Java priotities 2670 // which range from 1 to 10, libthread "thr_setprio" scale which range 2671 // from 0 to 127, and the current scheduling class of the process we 2672 // are running in. This is typically from -60 to +60. 2673 // The setting of the lwp priorities in done after a call to thr_setprio 2674 // so Java priorities are mapped to libthread priorities and we map from 2675 // the latter to lwp priorities. We don't keep priorities stored in 2676 // Java priorities since some of our worker threads want to set priorities 2677 // higher than all Java threads. 2678 // 2679 // For related information: 2680 // (1) man -s 2 priocntl 2681 // (2) man -s 4 priocntl 2682 // (3) man dispadmin 2683 // = librt.so 2684 // = libthread/common/rtsched.c - thrp_setlwpprio(). 2685 // = ps -cL <pid> ... to validate priority. 2686 // = sched_get_priority_min and _max 2687 // pthread_create 2688 // sched_setparam 2689 // pthread_setschedparam 2690 // 2691 // Assumptions: 2692 // + We assume that all threads in the process belong to the same 2693 // scheduling class. IE. an homogenous process. 2694 // + Must be root or in IA group to change change "interactive" attribute. 2695 // Priocntl() will fail silently. The only indication of failure is when 2696 // we read-back the value and notice that it hasn't changed. 2697 // + Interactive threads enter the runq at the head, non-interactive at the tail. 2698 // + For RT, change timeslice as well. Invariant: 2699 // constant "priority integral" 2700 // Konst == TimeSlice * (60-Priority) 2701 // Given a priority, compute appropriate timeslice. 2702 // + Higher numerical values have higher priority. 2703 2704 // sched class attributes 2705 typedef struct { 2706 int schedPolicy; // classID 2707 int maxPrio; 2708 int minPrio; 2709 } SchedInfo; 2710 2711 2712 static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits; 2713 2714 #ifdef ASSERT 2715 static int ReadBackValidate = 1; 2716 #endif 2717 static int myClass = 0; 2718 static int myMin = 0; 2719 static int myMax = 0; 2720 static int myCur = 0; 2721 static bool priocntl_enable = false; 2722 2723 static const int criticalPrio = FXCriticalPriority; 2724 static int java_MaxPriority_to_os_priority = 0; // Saved mapping 2725 2726 2727 // lwp_priocntl_init 2728 // 2729 // Try to determine the priority scale for our process. 2730 // 2731 // Return errno or 0 if OK. 2732 // 2733 static int lwp_priocntl_init() { 2734 int rslt; 2735 pcinfo_t ClassInfo; 2736 pcparms_t ParmInfo; 2737 int i; 2738 2739 if (!UseThreadPriorities) return 0; 2740 2741 // If ThreadPriorityPolicy is 1, switch tables 2742 if (ThreadPriorityPolicy == 1) { 2743 for (i = 0; i < CriticalPriority+1; i++) 2744 os::java_to_os_priority[i] = prio_policy1[i]; 2745 } 2746 if (UseCriticalJavaThreadPriority) { 2747 // MaxPriority always maps to the FX scheduling class and criticalPrio. 2748 // See set_native_priority() and set_lwp_class_and_priority(). 2749 // Save original MaxPriority mapping in case attempt to 2750 // use critical priority fails. 2751 java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority]; 2752 // Set negative to distinguish from other priorities 2753 os::java_to_os_priority[MaxPriority] = -criticalPrio; 2754 } 2755 2756 // Get IDs for a set of well-known scheduling classes. 2757 // TODO-FIXME: GETCLINFO returns the current # of classes in the 2758 // the system. We should have a loop that iterates over the 2759 // classID values, which are known to be "small" integers. 2760 2761 strcpy(ClassInfo.pc_clname, "TS"); 2762 ClassInfo.pc_cid = -1; 2763 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 2764 if (rslt < 0) return errno; 2765 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1"); 2766 tsLimits.schedPolicy = ClassInfo.pc_cid; 2767 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri; 2768 tsLimits.minPrio = -tsLimits.maxPrio; 2769 2770 strcpy(ClassInfo.pc_clname, "IA"); 2771 ClassInfo.pc_cid = -1; 2772 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 2773 if (rslt < 0) return errno; 2774 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1"); 2775 iaLimits.schedPolicy = ClassInfo.pc_cid; 2776 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri; 2777 iaLimits.minPrio = -iaLimits.maxPrio; 2778 2779 strcpy(ClassInfo.pc_clname, "RT"); 2780 ClassInfo.pc_cid = -1; 2781 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 2782 if (rslt < 0) return errno; 2783 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1"); 2784 rtLimits.schedPolicy = ClassInfo.pc_cid; 2785 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri; 2786 rtLimits.minPrio = 0; 2787 2788 strcpy(ClassInfo.pc_clname, "FX"); 2789 ClassInfo.pc_cid = -1; 2790 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 2791 if (rslt < 0) return errno; 2792 assert(ClassInfo.pc_cid != -1, "cid for FX class is -1"); 2793 fxLimits.schedPolicy = ClassInfo.pc_cid; 2794 fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri; 2795 fxLimits.minPrio = 0; 2796 2797 // Query our "current" scheduling class. 2798 // This will normally be IA, TS or, rarely, FX or RT. 2799 memset(&ParmInfo, 0, sizeof(ParmInfo)); 2800 ParmInfo.pc_cid = PC_CLNULL; 2801 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo); 2802 if (rslt < 0) return errno; 2803 myClass = ParmInfo.pc_cid; 2804 2805 // We now know our scheduling classId, get specific information 2806 // about the class. 2807 ClassInfo.pc_cid = myClass; 2808 ClassInfo.pc_clname[0] = 0; 2809 rslt = priocntl((idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo); 2810 if (rslt < 0) return errno; 2811 2812 if (ThreadPriorityVerbose) { 2813 tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname); 2814 } 2815 2816 memset(&ParmInfo, 0, sizeof(pcparms_t)); 2817 ParmInfo.pc_cid = PC_CLNULL; 2818 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo); 2819 if (rslt < 0) return errno; 2820 2821 if (ParmInfo.pc_cid == rtLimits.schedPolicy) { 2822 myMin = rtLimits.minPrio; 2823 myMax = rtLimits.maxPrio; 2824 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { 2825 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms; 2826 myMin = iaLimits.minPrio; 2827 myMax = iaLimits.maxPrio; 2828 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict 2829 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { 2830 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms; 2831 myMin = tsLimits.minPrio; 2832 myMax = tsLimits.maxPrio; 2833 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict 2834 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) { 2835 fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms; 2836 myMin = fxLimits.minPrio; 2837 myMax = fxLimits.maxPrio; 2838 myMax = MIN2(myMax, (int)fxInfo->fx_uprilim); // clamp - restrict 2839 } else { 2840 // No clue - punt 2841 if (ThreadPriorityVerbose) { 2842 tty->print_cr("Unknown scheduling class: %s ... \n", 2843 ClassInfo.pc_clname); 2844 } 2845 return EINVAL; // no clue, punt 2846 } 2847 2848 if (ThreadPriorityVerbose) { 2849 tty->print_cr("Thread priority Range: [%d..%d]\n", myMin, myMax); 2850 } 2851 2852 priocntl_enable = true; // Enable changing priorities 2853 return 0; 2854 } 2855 2856 #define IAPRI(x) ((iaparms_t *)((x).pc_clparms)) 2857 #define RTPRI(x) ((rtparms_t *)((x).pc_clparms)) 2858 #define TSPRI(x) ((tsparms_t *)((x).pc_clparms)) 2859 #define FXPRI(x) ((fxparms_t *)((x).pc_clparms)) 2860 2861 2862 // scale_to_lwp_priority 2863 // 2864 // Convert from the libthread "thr_setprio" scale to our current 2865 // lwp scheduling class scale. 2866 // 2867 static int scale_to_lwp_priority(int rMin, int rMax, int x) { 2868 int v; 2869 2870 if (x == 127) return rMax; // avoid round-down 2871 v = (((x*(rMax-rMin)))/128)+rMin; 2872 return v; 2873 } 2874 2875 2876 // set_lwp_class_and_priority 2877 int set_lwp_class_and_priority(int ThreadID, int lwpid, 2878 int newPrio, int new_class, bool scale) { 2879 int rslt; 2880 int Actual, Expected, prv; 2881 pcparms_t ParmInfo; // for GET-SET 2882 #ifdef ASSERT 2883 pcparms_t ReadBack; // for readback 2884 #endif 2885 2886 // Set priority via PC_GETPARMS, update, PC_SETPARMS 2887 // Query current values. 2888 // TODO: accelerate this by eliminating the PC_GETPARMS call. 2889 // Cache "pcparms_t" in global ParmCache. 2890 // TODO: elide set-to-same-value 2891 2892 // If something went wrong on init, don't change priorities. 2893 if (!priocntl_enable) { 2894 if (ThreadPriorityVerbose) { 2895 tty->print_cr("Trying to set priority but init failed, ignoring"); 2896 } 2897 return EINVAL; 2898 } 2899 2900 // If lwp hasn't started yet, just return 2901 // the _start routine will call us again. 2902 if (lwpid <= 0) { 2903 if (ThreadPriorityVerbose) { 2904 tty->print_cr("deferring the set_lwp_class_and_priority of thread " 2905 INTPTR_FORMAT " to %d, lwpid not set", 2906 ThreadID, newPrio); 2907 } 2908 return 0; 2909 } 2910 2911 if (ThreadPriorityVerbose) { 2912 tty->print_cr ("set_lwp_class_and_priority(" 2913 INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ", 2914 ThreadID, lwpid, newPrio); 2915 } 2916 2917 memset(&ParmInfo, 0, sizeof(pcparms_t)); 2918 ParmInfo.pc_cid = PC_CLNULL; 2919 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo); 2920 if (rslt < 0) return errno; 2921 2922 int cur_class = ParmInfo.pc_cid; 2923 ParmInfo.pc_cid = (id_t)new_class; 2924 2925 if (new_class == rtLimits.schedPolicy) { 2926 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms; 2927 rtInfo->rt_pri = scale ? scale_to_lwp_priority(rtLimits.minPrio, 2928 rtLimits.maxPrio, newPrio) 2929 : newPrio; 2930 rtInfo->rt_tqsecs = RT_NOCHANGE; 2931 rtInfo->rt_tqnsecs = RT_NOCHANGE; 2932 if (ThreadPriorityVerbose) { 2933 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri); 2934 } 2935 } else if (new_class == iaLimits.schedPolicy) { 2936 iaparms_t* iaInfo = (iaparms_t*)ParmInfo.pc_clparms; 2937 int maxClamped = MIN2(iaLimits.maxPrio, 2938 cur_class == new_class 2939 ? (int)iaInfo->ia_uprilim : iaLimits.maxPrio); 2940 iaInfo->ia_upri = scale ? scale_to_lwp_priority(iaLimits.minPrio, 2941 maxClamped, newPrio) 2942 : newPrio; 2943 iaInfo->ia_uprilim = cur_class == new_class 2944 ? IA_NOCHANGE : (pri_t)iaLimits.maxPrio; 2945 iaInfo->ia_mode = IA_NOCHANGE; 2946 if (ThreadPriorityVerbose) { 2947 tty->print_cr("IA: [%d...%d] %d->%d\n", 2948 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri); 2949 } 2950 } else if (new_class == tsLimits.schedPolicy) { 2951 tsparms_t* tsInfo = (tsparms_t*)ParmInfo.pc_clparms; 2952 int maxClamped = MIN2(tsLimits.maxPrio, 2953 cur_class == new_class 2954 ? (int)tsInfo->ts_uprilim : tsLimits.maxPrio); 2955 tsInfo->ts_upri = scale ? scale_to_lwp_priority(tsLimits.minPrio, 2956 maxClamped, newPrio) 2957 : newPrio; 2958 tsInfo->ts_uprilim = cur_class == new_class 2959 ? TS_NOCHANGE : (pri_t)tsLimits.maxPrio; 2960 if (ThreadPriorityVerbose) { 2961 tty->print_cr("TS: [%d...%d] %d->%d\n", 2962 tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri); 2963 } 2964 } else if (new_class == fxLimits.schedPolicy) { 2965 fxparms_t* fxInfo = (fxparms_t*)ParmInfo.pc_clparms; 2966 int maxClamped = MIN2(fxLimits.maxPrio, 2967 cur_class == new_class 2968 ? (int)fxInfo->fx_uprilim : fxLimits.maxPrio); 2969 fxInfo->fx_upri = scale ? scale_to_lwp_priority(fxLimits.minPrio, 2970 maxClamped, newPrio) 2971 : newPrio; 2972 fxInfo->fx_uprilim = cur_class == new_class 2973 ? FX_NOCHANGE : (pri_t)fxLimits.maxPrio; 2974 fxInfo->fx_tqsecs = FX_NOCHANGE; 2975 fxInfo->fx_tqnsecs = FX_NOCHANGE; 2976 if (ThreadPriorityVerbose) { 2977 tty->print_cr("FX: [%d...%d] %d->%d\n", 2978 fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri); 2979 } 2980 } else { 2981 if (ThreadPriorityVerbose) { 2982 tty->print_cr("Unknown new scheduling class %d\n", new_class); 2983 } 2984 return EINVAL; // no clue, punt 2985 } 2986 2987 rslt = priocntl(P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo); 2988 if (ThreadPriorityVerbose && rslt) { 2989 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno); 2990 } 2991 if (rslt < 0) return errno; 2992 2993 #ifdef ASSERT 2994 // Sanity check: read back what we just attempted to set. 2995 // In theory it could have changed in the interim ... 2996 // 2997 // The priocntl system call is tricky. 2998 // Sometimes it'll validate the priority value argument and 2999 // return EINVAL if unhappy. At other times it fails silently. 3000 // Readbacks are prudent. 3001 3002 if (!ReadBackValidate) return 0; 3003 3004 memset(&ReadBack, 0, sizeof(pcparms_t)); 3005 ReadBack.pc_cid = PC_CLNULL; 3006 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack); 3007 assert(rslt >= 0, "priocntl failed"); 3008 Actual = Expected = 0xBAD; 3009 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match"); 3010 if (ParmInfo.pc_cid == rtLimits.schedPolicy) { 3011 Actual = RTPRI(ReadBack)->rt_pri; 3012 Expected = RTPRI(ParmInfo)->rt_pri; 3013 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { 3014 Actual = IAPRI(ReadBack)->ia_upri; 3015 Expected = IAPRI(ParmInfo)->ia_upri; 3016 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { 3017 Actual = TSPRI(ReadBack)->ts_upri; 3018 Expected = TSPRI(ParmInfo)->ts_upri; 3019 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) { 3020 Actual = FXPRI(ReadBack)->fx_upri; 3021 Expected = FXPRI(ParmInfo)->fx_upri; 3022 } else { 3023 if (ThreadPriorityVerbose) { 3024 tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n", 3025 ParmInfo.pc_cid); 3026 } 3027 } 3028 3029 if (Actual != Expected) { 3030 if (ThreadPriorityVerbose) { 3031 tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n", 3032 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected); 3033 } 3034 } 3035 #endif 3036 3037 return 0; 3038 } 3039 3040 // Solaris only gives access to 128 real priorities at a time, 3041 // so we expand Java's ten to fill this range. This would be better 3042 // if we dynamically adjusted relative priorities. 3043 // 3044 // The ThreadPriorityPolicy option allows us to select 2 different 3045 // priority scales. 3046 // 3047 // ThreadPriorityPolicy=0 3048 // Since the Solaris' default priority is MaximumPriority, we do not 3049 // set a priority lower than Max unless a priority lower than 3050 // NormPriority is requested. 3051 // 3052 // ThreadPriorityPolicy=1 3053 // This mode causes the priority table to get filled with 3054 // linear values. NormPriority get's mapped to 50% of the 3055 // Maximum priority an so on. This will cause VM threads 3056 // to get unfair treatment against other Solaris processes 3057 // which do not explicitly alter their thread priorities. 3058 3059 int os::java_to_os_priority[CriticalPriority + 1] = { 3060 -99999, // 0 Entry should never be used 3061 3062 0, // 1 MinPriority 3063 32, // 2 3064 64, // 3 3065 3066 96, // 4 3067 127, // 5 NormPriority 3068 127, // 6 3069 3070 127, // 7 3071 127, // 8 3072 127, // 9 NearMaxPriority 3073 3074 127, // 10 MaxPriority 3075 3076 -criticalPrio // 11 CriticalPriority 3077 }; 3078 3079 OSReturn os::set_native_priority(Thread* thread, int newpri) { 3080 OSThread* osthread = thread->osthread(); 3081 3082 // Save requested priority in case the thread hasn't been started 3083 osthread->set_native_priority(newpri); 3084 3085 // Check for critical priority request 3086 bool fxcritical = false; 3087 if (newpri == -criticalPrio) { 3088 fxcritical = true; 3089 newpri = criticalPrio; 3090 } 3091 3092 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping"); 3093 if (!UseThreadPriorities) return OS_OK; 3094 3095 int status = 0; 3096 3097 if (!fxcritical) { 3098 // Use thr_setprio only if we have a priority that thr_setprio understands 3099 status = thr_setprio(thread->osthread()->thread_id(), newpri); 3100 } 3101 3102 int lwp_status = 3103 set_lwp_class_and_priority(osthread->thread_id(), 3104 osthread->lwp_id(), 3105 newpri, 3106 fxcritical ? fxLimits.schedPolicy : myClass, 3107 !fxcritical); 3108 if (lwp_status != 0 && fxcritical) { 3109 // Try again, this time without changing the scheduling class 3110 newpri = java_MaxPriority_to_os_priority; 3111 lwp_status = set_lwp_class_and_priority(osthread->thread_id(), 3112 osthread->lwp_id(), 3113 newpri, myClass, false); 3114 } 3115 status |= lwp_status; 3116 return (status == 0) ? OS_OK : OS_ERR; 3117 } 3118 3119 3120 OSReturn os::get_native_priority(const Thread* const thread, 3121 int *priority_ptr) { 3122 int p; 3123 if (!UseThreadPriorities) { 3124 *priority_ptr = NormalPriority; 3125 return OS_OK; 3126 } 3127 int status = thr_getprio(thread->osthread()->thread_id(), &p); 3128 if (status != 0) { 3129 return OS_ERR; 3130 } 3131 *priority_ptr = p; 3132 return OS_OK; 3133 } 3134 3135 //////////////////////////////////////////////////////////////////////////////// 3136 // suspend/resume support 3137 3138 // The low-level signal-based suspend/resume support is a remnant from the 3139 // old VM-suspension that used to be for java-suspension, safepoints etc, 3140 // within hotspot. Currently used by JFR's OSThreadSampler 3141 // 3142 // The remaining code is greatly simplified from the more general suspension 3143 // code that used to be used. 3144 // 3145 // The protocol is quite simple: 3146 // - suspend: 3147 // - sends a signal to the target thread 3148 // - polls the suspend state of the osthread using a yield loop 3149 // - target thread signal handler (SR_handler) sets suspend state 3150 // and blocks in sigsuspend until continued 3151 // - resume: 3152 // - sets target osthread state to continue 3153 // - sends signal to end the sigsuspend loop in the SR_handler 3154 // 3155 // Note that the SR_lock plays no role in this suspend/resume protocol, 3156 // but is checked for NULL in SR_handler as a thread termination indicator. 3157 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs. 3158 // 3159 // Note that resume_clear_context() and suspend_save_context() are needed 3160 // by SR_handler(), so that fetch_frame_from_ucontext() works, 3161 // which in part is used by: 3162 // - Forte Analyzer: AsyncGetCallTrace() 3163 // - StackBanging: get_frame_at_stack_banging_point() 3164 // - JFR: get_topframe()-->....-->get_valid_uc_in_signal_handler() 3165 3166 static void resume_clear_context(OSThread *osthread) { 3167 osthread->set_ucontext(NULL); 3168 } 3169 3170 static void suspend_save_context(OSThread *osthread, ucontext_t* context) { 3171 osthread->set_ucontext(context); 3172 } 3173 3174 static PosixSemaphore sr_semaphore; 3175 3176 void os::Solaris::SR_handler(Thread* thread, ucontext_t* context) { 3177 // Save and restore errno to avoid confusing native code with EINTR 3178 // after sigsuspend. 3179 int old_errno = errno; 3180 3181 OSThread* osthread = thread->osthread(); 3182 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); 3183 3184 os::SuspendResume::State current = osthread->sr.state(); 3185 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { 3186 suspend_save_context(osthread, context); 3187 3188 // attempt to switch the state, we assume we had a SUSPEND_REQUEST 3189 os::SuspendResume::State state = osthread->sr.suspended(); 3190 if (state == os::SuspendResume::SR_SUSPENDED) { 3191 sigset_t suspend_set; // signals for sigsuspend() 3192 3193 // get current set of blocked signals and unblock resume signal 3194 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); 3195 sigdelset(&suspend_set, ASYNC_SIGNAL); 3196 3197 sr_semaphore.signal(); 3198 // wait here until we are resumed 3199 while (1) { 3200 sigsuspend(&suspend_set); 3201 3202 os::SuspendResume::State result = osthread->sr.running(); 3203 if (result == os::SuspendResume::SR_RUNNING) { 3204 sr_semaphore.signal(); 3205 break; 3206 } 3207 } 3208 3209 } else if (state == os::SuspendResume::SR_RUNNING) { 3210 // request was cancelled, continue 3211 } else { 3212 ShouldNotReachHere(); 3213 } 3214 3215 resume_clear_context(osthread); 3216 } else if (current == os::SuspendResume::SR_RUNNING) { 3217 // request was cancelled, continue 3218 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { 3219 // ignore 3220 } else { 3221 // ignore 3222 } 3223 3224 errno = old_errno; 3225 } 3226 3227 void os::print_statistics() { 3228 } 3229 3230 bool os::message_box(const char* title, const char* message) { 3231 int i; 3232 fdStream err(defaultStream::error_fd()); 3233 for (i = 0; i < 78; i++) err.print_raw("="); 3234 err.cr(); 3235 err.print_raw_cr(title); 3236 for (i = 0; i < 78; i++) err.print_raw("-"); 3237 err.cr(); 3238 err.print_raw_cr(message); 3239 for (i = 0; i < 78; i++) err.print_raw("="); 3240 err.cr(); 3241 3242 char buf[16]; 3243 // Prevent process from exiting upon "read error" without consuming all CPU 3244 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 3245 3246 return buf[0] == 'y' || buf[0] == 'Y'; 3247 } 3248 3249 static int sr_notify(OSThread* osthread) { 3250 int status = thr_kill(osthread->thread_id(), ASYNC_SIGNAL); 3251 assert_status(status == 0, status, "thr_kill"); 3252 return status; 3253 } 3254 3255 // "Randomly" selected value for how long we want to spin 3256 // before bailing out on suspending a thread, also how often 3257 // we send a signal to a thread we want to resume 3258 static const int RANDOMLY_LARGE_INTEGER = 1000000; 3259 static const int RANDOMLY_LARGE_INTEGER2 = 100; 3260 3261 static bool do_suspend(OSThread* osthread) { 3262 assert(osthread->sr.is_running(), "thread should be running"); 3263 assert(!sr_semaphore.trywait(), "semaphore has invalid state"); 3264 3265 // mark as suspended and send signal 3266 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { 3267 // failed to switch, state wasn't running? 3268 ShouldNotReachHere(); 3269 return false; 3270 } 3271 3272 if (sr_notify(osthread) != 0) { 3273 ShouldNotReachHere(); 3274 } 3275 3276 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED 3277 while (true) { 3278 if (sr_semaphore.timedwait(2000)) { 3279 break; 3280 } else { 3281 // timeout 3282 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); 3283 if (cancelled == os::SuspendResume::SR_RUNNING) { 3284 return false; 3285 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { 3286 // make sure that we consume the signal on the semaphore as well 3287 sr_semaphore.wait(); 3288 break; 3289 } else { 3290 ShouldNotReachHere(); 3291 return false; 3292 } 3293 } 3294 } 3295 3296 guarantee(osthread->sr.is_suspended(), "Must be suspended"); 3297 return true; 3298 } 3299 3300 static void do_resume(OSThread* osthread) { 3301 assert(osthread->sr.is_suspended(), "thread should be suspended"); 3302 assert(!sr_semaphore.trywait(), "invalid semaphore state"); 3303 3304 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { 3305 // failed to switch to WAKEUP_REQUEST 3306 ShouldNotReachHere(); 3307 return; 3308 } 3309 3310 while (true) { 3311 if (sr_notify(osthread) == 0) { 3312 if (sr_semaphore.timedwait(2)) { 3313 if (osthread->sr.is_running()) { 3314 return; 3315 } 3316 } 3317 } else { 3318 ShouldNotReachHere(); 3319 } 3320 } 3321 3322 guarantee(osthread->sr.is_running(), "Must be running!"); 3323 } 3324 3325 void os::SuspendedThreadTask::internal_do_task() { 3326 if (do_suspend(_thread->osthread())) { 3327 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); 3328 do_task(context); 3329 do_resume(_thread->osthread()); 3330 } 3331 } 3332 3333 // This does not do anything on Solaris. This is basically a hook for being 3334 // able to use structured exception handling (thread-local exception filters) on, e.g., Win32. 3335 void os::os_exception_wrapper(java_call_t f, JavaValue* value, 3336 const methodHandle& method, JavaCallArguments* args, 3337 Thread* thread) { 3338 f(value, method, args, thread); 3339 } 3340 3341 // This routine may be used by user applications as a "hook" to catch signals. 3342 // The user-defined signal handler must pass unrecognized signals to this 3343 // routine, and if it returns true (non-zero), then the signal handler must 3344 // return immediately. If the flag "abort_if_unrecognized" is true, then this 3345 // routine will never retun false (zero), but instead will execute a VM panic 3346 // routine kill the process. 3347 // 3348 // If this routine returns false, it is OK to call it again. This allows 3349 // the user-defined signal handler to perform checks either before or after 3350 // the VM performs its own checks. Naturally, the user code would be making 3351 // a serious error if it tried to handle an exception (such as a null check 3352 // or breakpoint) that the VM was generating for its own correct operation. 3353 // 3354 // This routine may recognize any of the following kinds of signals: 3355 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ, 3356 // ASYNC_SIGNAL. 3357 // It should be consulted by handlers for any of those signals. 3358 // 3359 // The caller of this routine must pass in the three arguments supplied 3360 // to the function referred to in the "sa_sigaction" (not the "sa_handler") 3361 // field of the structure passed to sigaction(). This routine assumes that 3362 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 3363 // 3364 // Note that the VM will print warnings if it detects conflicting signal 3365 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 3366 // 3367 extern "C" JNIEXPORT int JVM_handle_solaris_signal(int signo, 3368 siginfo_t* siginfo, 3369 void* ucontext, 3370 int abort_if_unrecognized); 3371 3372 3373 void signalHandler(int sig, siginfo_t* info, void* ucVoid) { 3374 int orig_errno = errno; // Preserve errno value over signal handler. 3375 JVM_handle_solaris_signal(sig, info, ucVoid, true); 3376 errno = orig_errno; 3377 } 3378 3379 // This boolean allows users to forward their own non-matching signals 3380 // to JVM_handle_solaris_signal, harmlessly. 3381 bool os::Solaris::signal_handlers_are_installed = false; 3382 3383 // For signal-chaining 3384 bool os::Solaris::libjsig_is_loaded = false; 3385 typedef struct sigaction *(*get_signal_t)(int); 3386 get_signal_t os::Solaris::get_signal_action = NULL; 3387 3388 struct sigaction* os::Solaris::get_chained_signal_action(int sig) { 3389 struct sigaction *actp = NULL; 3390 3391 if ((libjsig_is_loaded) && (sig <= Maxsignum)) { 3392 // Retrieve the old signal handler from libjsig 3393 actp = (*get_signal_action)(sig); 3394 } 3395 if (actp == NULL) { 3396 // Retrieve the preinstalled signal handler from jvm 3397 actp = get_preinstalled_handler(sig); 3398 } 3399 3400 return actp; 3401 } 3402 3403 static bool call_chained_handler(struct sigaction *actp, int sig, 3404 siginfo_t *siginfo, void *context) { 3405 // Call the old signal handler 3406 if (actp->sa_handler == SIG_DFL) { 3407 // It's more reasonable to let jvm treat it as an unexpected exception 3408 // instead of taking the default action. 3409 return false; 3410 } else if (actp->sa_handler != SIG_IGN) { 3411 if ((actp->sa_flags & SA_NODEFER) == 0) { 3412 // automaticlly block the signal 3413 sigaddset(&(actp->sa_mask), sig); 3414 } 3415 3416 sa_handler_t hand; 3417 sa_sigaction_t sa; 3418 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 3419 // retrieve the chained handler 3420 if (siginfo_flag_set) { 3421 sa = actp->sa_sigaction; 3422 } else { 3423 hand = actp->sa_handler; 3424 } 3425 3426 if ((actp->sa_flags & SA_RESETHAND) != 0) { 3427 actp->sa_handler = SIG_DFL; 3428 } 3429 3430 // try to honor the signal mask 3431 sigset_t oset; 3432 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); 3433 3434 // call into the chained handler 3435 if (siginfo_flag_set) { 3436 (*sa)(sig, siginfo, context); 3437 } else { 3438 (*hand)(sig); 3439 } 3440 3441 // restore the signal mask 3442 pthread_sigmask(SIG_SETMASK, &oset, 0); 3443 } 3444 // Tell jvm's signal handler the signal is taken care of. 3445 return true; 3446 } 3447 3448 bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) { 3449 bool chained = false; 3450 // signal-chaining 3451 if (UseSignalChaining) { 3452 struct sigaction *actp = get_chained_signal_action(sig); 3453 if (actp != NULL) { 3454 chained = call_chained_handler(actp, sig, siginfo, context); 3455 } 3456 } 3457 return chained; 3458 } 3459 3460 struct sigaction* os::Solaris::get_preinstalled_handler(int sig) { 3461 assert((chainedsigactions != (struct sigaction *)NULL) && 3462 (preinstalled_sigs != (int *)NULL), "signals not yet initialized"); 3463 if (preinstalled_sigs[sig] != 0) { 3464 return &chainedsigactions[sig]; 3465 } 3466 return NULL; 3467 } 3468 3469 void os::Solaris::save_preinstalled_handler(int sig, 3470 struct sigaction& oldAct) { 3471 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range"); 3472 assert((chainedsigactions != (struct sigaction *)NULL) && 3473 (preinstalled_sigs != (int *)NULL), "signals not yet initialized"); 3474 chainedsigactions[sig] = oldAct; 3475 preinstalled_sigs[sig] = 1; 3476 } 3477 3478 void os::Solaris::set_signal_handler(int sig, bool set_installed, 3479 bool oktochain) { 3480 // Check for overwrite. 3481 struct sigaction oldAct; 3482 sigaction(sig, (struct sigaction*)NULL, &oldAct); 3483 void* oldhand = 3484 oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3485 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3486 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 3487 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 3488 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) { 3489 if (AllowUserSignalHandlers || !set_installed) { 3490 // Do not overwrite; user takes responsibility to forward to us. 3491 return; 3492 } else if (UseSignalChaining) { 3493 if (oktochain) { 3494 // save the old handler in jvm 3495 save_preinstalled_handler(sig, oldAct); 3496 } else { 3497 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal."); 3498 } 3499 // libjsig also interposes the sigaction() call below and saves the 3500 // old sigaction on it own. 3501 } else { 3502 fatal("Encountered unexpected pre-existing sigaction handler " 3503 "%#lx for signal %d.", (long)oldhand, sig); 3504 } 3505 } 3506 3507 struct sigaction sigAct; 3508 sigfillset(&(sigAct.sa_mask)); 3509 sigAct.sa_handler = SIG_DFL; 3510 3511 sigAct.sa_sigaction = signalHandler; 3512 // Handle SIGSEGV on alternate signal stack if 3513 // not using stack banging 3514 if (!UseStackBanging && sig == SIGSEGV) { 3515 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK; 3516 } else { 3517 sigAct.sa_flags = SA_SIGINFO | SA_RESTART; 3518 } 3519 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags); 3520 3521 sigaction(sig, &sigAct, &oldAct); 3522 3523 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3524 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3525 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 3526 } 3527 3528 3529 #define DO_SIGNAL_CHECK(sig) \ 3530 do { \ 3531 if (!sigismember(&check_signal_done, sig)) { \ 3532 os::Solaris::check_signal_handler(sig); \ 3533 } \ 3534 } while (0) 3535 3536 // This method is a periodic task to check for misbehaving JNI applications 3537 // under CheckJNI, we can add any periodic checks here 3538 3539 void os::run_periodic_checks() { 3540 // A big source of grief is hijacking virt. addr 0x0 on Solaris, 3541 // thereby preventing a NULL checks. 3542 if (!check_addr0_done) check_addr0_done = check_addr0(tty); 3543 3544 if (check_signals == false) return; 3545 3546 // SEGV and BUS if overridden could potentially prevent 3547 // generation of hs*.log in the event of a crash, debugging 3548 // such a case can be very challenging, so we absolutely 3549 // check for the following for a good measure: 3550 DO_SIGNAL_CHECK(SIGSEGV); 3551 DO_SIGNAL_CHECK(SIGILL); 3552 DO_SIGNAL_CHECK(SIGFPE); 3553 DO_SIGNAL_CHECK(SIGBUS); 3554 DO_SIGNAL_CHECK(SIGPIPE); 3555 DO_SIGNAL_CHECK(SIGXFSZ); 3556 DO_SIGNAL_CHECK(ASYNC_SIGNAL); 3557 3558 // ReduceSignalUsage allows the user to override these handlers 3559 // see comments at the very top and jvm_solaris.h 3560 if (!ReduceSignalUsage) { 3561 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 3562 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 3563 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 3564 DO_SIGNAL_CHECK(BREAK_SIGNAL); 3565 } 3566 } 3567 3568 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 3569 3570 static os_sigaction_t os_sigaction = NULL; 3571 3572 void os::Solaris::check_signal_handler(int sig) { 3573 char buf[O_BUFLEN]; 3574 address jvmHandler = NULL; 3575 3576 struct sigaction act; 3577 if (os_sigaction == NULL) { 3578 // only trust the default sigaction, in case it has been interposed 3579 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); 3580 if (os_sigaction == NULL) return; 3581 } 3582 3583 os_sigaction(sig, (struct sigaction*)NULL, &act); 3584 3585 address thisHandler = (act.sa_flags & SA_SIGINFO) 3586 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 3587 : CAST_FROM_FN_PTR(address, act.sa_handler); 3588 3589 3590 switch (sig) { 3591 case SIGSEGV: 3592 case SIGBUS: 3593 case SIGFPE: 3594 case SIGPIPE: 3595 case SIGXFSZ: 3596 case SIGILL: 3597 case ASYNC_SIGNAL: 3598 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler); 3599 break; 3600 3601 case SHUTDOWN1_SIGNAL: 3602 case SHUTDOWN2_SIGNAL: 3603 case SHUTDOWN3_SIGNAL: 3604 case BREAK_SIGNAL: 3605 jvmHandler = (address)user_handler(); 3606 break; 3607 3608 default: 3609 return; 3610 } 3611 3612 if (thisHandler != jvmHandler) { 3613 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 3614 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 3615 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 3616 // No need to check this sig any longer 3617 sigaddset(&check_signal_done, sig); 3618 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN 3619 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) { 3620 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell", 3621 exception_name(sig, buf, O_BUFLEN)); 3622 } 3623 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) { 3624 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 3625 tty->print("expected:"); 3626 os::Posix::print_sa_flags(tty, os::Solaris::get_our_sigflags(sig)); 3627 tty->cr(); 3628 tty->print(" found:"); 3629 os::Posix::print_sa_flags(tty, act.sa_flags); 3630 tty->cr(); 3631 // No need to check this sig any longer 3632 sigaddset(&check_signal_done, sig); 3633 } 3634 3635 // Print all the signal handler state 3636 if (sigismember(&check_signal_done, sig)) { 3637 print_signal_handlers(tty, buf, O_BUFLEN); 3638 } 3639 3640 } 3641 3642 void os::Solaris::install_signal_handlers() { 3643 signal_handlers_are_installed = true; 3644 3645 // signal-chaining 3646 typedef void (*signal_setting_t)(); 3647 signal_setting_t begin_signal_setting = NULL; 3648 signal_setting_t end_signal_setting = NULL; 3649 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3650 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 3651 if (begin_signal_setting != NULL) { 3652 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3653 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 3654 get_signal_action = CAST_TO_FN_PTR(get_signal_t, 3655 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 3656 libjsig_is_loaded = true; 3657 assert(UseSignalChaining, "should enable signal-chaining"); 3658 } 3659 if (libjsig_is_loaded) { 3660 // Tell libjsig jvm is setting signal handlers 3661 (*begin_signal_setting)(); 3662 } 3663 3664 set_signal_handler(SIGSEGV, true, true); 3665 set_signal_handler(SIGPIPE, true, true); 3666 set_signal_handler(SIGXFSZ, true, true); 3667 set_signal_handler(SIGBUS, true, true); 3668 set_signal_handler(SIGILL, true, true); 3669 set_signal_handler(SIGFPE, true, true); 3670 set_signal_handler(ASYNC_SIGNAL, true, true); 3671 3672 if (libjsig_is_loaded) { 3673 // Tell libjsig jvm finishes setting signal handlers 3674 (*end_signal_setting)(); 3675 } 3676 3677 // We don't activate signal checker if libjsig is in place, we trust ourselves 3678 // and if UserSignalHandler is installed all bets are off. 3679 // Log that signal checking is off only if -verbose:jni is specified. 3680 if (CheckJNICalls) { 3681 if (libjsig_is_loaded) { 3682 log_debug(jni, resolve)("Info: libjsig is activated, all active signal checking is disabled"); 3683 check_signals = false; 3684 } 3685 if (AllowUserSignalHandlers) { 3686 log_debug(jni, resolve)("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 3687 check_signals = false; 3688 } 3689 } 3690 } 3691 3692 3693 void report_error(const char* file_name, int line_no, const char* title, 3694 const char* format, ...); 3695 3696 // (Static) wrappers for the liblgrp API 3697 os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home; 3698 os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init; 3699 os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini; 3700 os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root; 3701 os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children; 3702 os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources; 3703 os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps; 3704 os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale; 3705 os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0; 3706 3707 static address resolve_symbol_lazy(const char* name) { 3708 address addr = (address) dlsym(RTLD_DEFAULT, name); 3709 if (addr == NULL) { 3710 // RTLD_DEFAULT was not defined on some early versions of 2.5.1 3711 addr = (address) dlsym(RTLD_NEXT, name); 3712 } 3713 return addr; 3714 } 3715 3716 static address resolve_symbol(const char* name) { 3717 address addr = resolve_symbol_lazy(name); 3718 if (addr == NULL) { 3719 fatal(dlerror()); 3720 } 3721 return addr; 3722 } 3723 3724 void os::Solaris::libthread_init() { 3725 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators"); 3726 3727 lwp_priocntl_init(); 3728 3729 // RTLD_DEFAULT was not defined on some early versions of 5.5.1 3730 if (func == NULL) { 3731 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators"); 3732 // Guarantee that this VM is running on an new enough OS (5.6 or 3733 // later) that it will have a new enough libthread.so. 3734 guarantee(func != NULL, "libthread.so is too old."); 3735 } 3736 3737 int size; 3738 void (*handler_info_func)(address *, int *); 3739 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo")); 3740 handler_info_func(&handler_start, &size); 3741 handler_end = handler_start + size; 3742 } 3743 3744 3745 int_fnP_mutex_tP os::Solaris::_mutex_lock; 3746 int_fnP_mutex_tP os::Solaris::_mutex_trylock; 3747 int_fnP_mutex_tP os::Solaris::_mutex_unlock; 3748 int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init; 3749 int_fnP_mutex_tP os::Solaris::_mutex_destroy; 3750 int os::Solaris::_mutex_scope = USYNC_THREAD; 3751 3752 int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait; 3753 int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait; 3754 int_fnP_cond_tP os::Solaris::_cond_signal; 3755 int_fnP_cond_tP os::Solaris::_cond_broadcast; 3756 int_fnP_cond_tP_i_vP os::Solaris::_cond_init; 3757 int_fnP_cond_tP os::Solaris::_cond_destroy; 3758 int os::Solaris::_cond_scope = USYNC_THREAD; 3759 bool os::Solaris::_synchronization_initialized; 3760 3761 void os::Solaris::synchronization_init() { 3762 if (UseLWPSynchronization) { 3763 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock"))); 3764 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock"))); 3765 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock"))); 3766 os::Solaris::set_mutex_init(lwp_mutex_init); 3767 os::Solaris::set_mutex_destroy(lwp_mutex_destroy); 3768 os::Solaris::set_mutex_scope(USYNC_THREAD); 3769 3770 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait"))); 3771 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait"))); 3772 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal"))); 3773 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast"))); 3774 os::Solaris::set_cond_init(lwp_cond_init); 3775 os::Solaris::set_cond_destroy(lwp_cond_destroy); 3776 os::Solaris::set_cond_scope(USYNC_THREAD); 3777 } else { 3778 os::Solaris::set_mutex_scope(USYNC_THREAD); 3779 os::Solaris::set_cond_scope(USYNC_THREAD); 3780 3781 if (UsePthreads) { 3782 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock"))); 3783 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock"))); 3784 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock"))); 3785 os::Solaris::set_mutex_init(pthread_mutex_default_init); 3786 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy"))); 3787 3788 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait"))); 3789 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait"))); 3790 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal"))); 3791 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast"))); 3792 os::Solaris::set_cond_init(pthread_cond_default_init); 3793 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy"))); 3794 } else { 3795 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock"))); 3796 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock"))); 3797 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock"))); 3798 os::Solaris::set_mutex_init(::mutex_init); 3799 os::Solaris::set_mutex_destroy(::mutex_destroy); 3800 3801 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait"))); 3802 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait"))); 3803 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal"))); 3804 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast"))); 3805 os::Solaris::set_cond_init(::cond_init); 3806 os::Solaris::set_cond_destroy(::cond_destroy); 3807 } 3808 } 3809 _synchronization_initialized = true; 3810 } 3811 3812 bool os::Solaris::liblgrp_init() { 3813 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY); 3814 if (handle != NULL) { 3815 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home"))); 3816 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init"))); 3817 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini"))); 3818 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root"))); 3819 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children"))); 3820 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources"))); 3821 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps"))); 3822 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t, 3823 dlsym(handle, "lgrp_cookie_stale"))); 3824 3825 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER); 3826 set_lgrp_cookie(c); 3827 return true; 3828 } 3829 return false; 3830 } 3831 3832 // int pset_getloadavg(psetid_t pset, double loadavg[], int nelem); 3833 typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem); 3834 static pset_getloadavg_type pset_getloadavg_ptr = NULL; 3835 3836 void init_pset_getloadavg_ptr(void) { 3837 pset_getloadavg_ptr = 3838 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg"); 3839 if (pset_getloadavg_ptr == NULL) { 3840 log_warning(os)("pset_getloadavg function not found"); 3841 } 3842 } 3843 3844 int os::Solaris::_dev_zero_fd = -1; 3845 3846 // this is called _before_ the global arguments have been parsed 3847 void os::init(void) { 3848 _initial_pid = getpid(); 3849 3850 max_hrtime = first_hrtime = gethrtime(); 3851 3852 init_random(1234567); 3853 3854 page_size = sysconf(_SC_PAGESIZE); 3855 if (page_size == -1) { 3856 fatal("os_solaris.cpp: os::init: sysconf failed (%s)", os::strerror(errno)); 3857 } 3858 init_page_sizes((size_t) page_size); 3859 3860 Solaris::initialize_system_info(); 3861 3862 int fd = ::open("/dev/zero", O_RDWR); 3863 if (fd < 0) { 3864 fatal("os::init: cannot open /dev/zero (%s)", os::strerror(errno)); 3865 } else { 3866 Solaris::set_dev_zero_fd(fd); 3867 3868 // Close on exec, child won't inherit. 3869 fcntl(fd, F_SETFD, FD_CLOEXEC); 3870 } 3871 3872 clock_tics_per_sec = CLK_TCK; 3873 3874 // check if dladdr1() exists; dladdr1 can provide more information than 3875 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9 3876 // and is available on linker patches for 5.7 and 5.8. 3877 // libdl.so must have been loaded, this call is just an entry lookup 3878 void * hdl = dlopen("libdl.so", RTLD_NOW); 3879 if (hdl) { 3880 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1")); 3881 } 3882 3883 // main_thread points to the thread that created/loaded the JVM. 3884 main_thread = thr_self(); 3885 3886 // dynamic lookup of functions that may not be available in our lowest 3887 // supported Solaris release 3888 void * handle = dlopen("libc.so.1", RTLD_LAZY); 3889 if (handle != NULL) { 3890 Solaris::_pthread_setname_np = // from 11.3 3891 (Solaris::pthread_setname_np_func_t)dlsym(handle, "pthread_setname_np"); 3892 } 3893 3894 // Shared Posix initialization 3895 os::Posix::init(); 3896 } 3897 3898 // To install functions for atexit system call 3899 extern "C" { 3900 static void perfMemory_exit_helper() { 3901 perfMemory_exit(); 3902 } 3903 } 3904 3905 // this is called _after_ the global arguments have been parsed 3906 jint os::init_2(void) { 3907 // try to enable extended file IO ASAP, see 6431278 3908 os::Solaris::try_enable_extended_io(); 3909 3910 // Check and sets minimum stack sizes against command line options 3911 if (Posix::set_minimum_stack_sizes() == JNI_ERR) { 3912 return JNI_ERR; 3913 } 3914 3915 Solaris::libthread_init(); 3916 3917 if (UseNUMA) { 3918 if (!Solaris::liblgrp_init()) { 3919 UseNUMA = false; 3920 } else { 3921 size_t lgrp_limit = os::numa_get_groups_num(); 3922 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtInternal); 3923 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit); 3924 FREE_C_HEAP_ARRAY(int, lgrp_ids); 3925 if (lgrp_num < 2) { 3926 // There's only one locality group, disable NUMA unless 3927 // user explicilty forces NUMA optimizations on single-node/UMA systems 3928 UseNUMA = ForceNUMA; 3929 } 3930 } 3931 } 3932 3933 Solaris::signal_sets_init(); 3934 Solaris::init_signal_mem(); 3935 Solaris::install_signal_handlers(); 3936 // Initialize data for jdk.internal.misc.Signal 3937 if (!ReduceSignalUsage) { 3938 jdk_misc_signal_init(); 3939 } 3940 3941 // initialize synchronization primitives to use either thread or 3942 // lwp synchronization (controlled by UseLWPSynchronization) 3943 Solaris::synchronization_init(); 3944 DEBUG_ONLY(os::set_mutex_init_done();) 3945 3946 if (MaxFDLimit) { 3947 // set the number of file descriptors to max. print out error 3948 // if getrlimit/setrlimit fails but continue regardless. 3949 struct rlimit nbr_files; 3950 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 3951 if (status != 0) { 3952 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno)); 3953 } else { 3954 nbr_files.rlim_cur = nbr_files.rlim_max; 3955 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 3956 if (status != 0) { 3957 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno)); 3958 } 3959 } 3960 } 3961 3962 // Calculate theoretical max. size of Threads to guard gainst 3963 // artifical out-of-memory situations, where all available address- 3964 // space has been reserved by thread stacks. Default stack size is 1Mb. 3965 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ? 3966 JavaThread::stack_size_at_create() : (1*K*K); 3967 assert(pre_thread_stack_size != 0, "Must have a stack"); 3968 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when 3969 // we should start doing Virtual Memory banging. Currently when the threads will 3970 // have used all but 200Mb of space. 3971 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K); 3972 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size; 3973 3974 // at-exit methods are called in the reverse order of their registration. 3975 // In Solaris 7 and earlier, atexit functions are called on return from 3976 // main or as a result of a call to exit(3C). There can be only 32 of 3977 // these functions registered and atexit() does not set errno. In Solaris 3978 // 8 and later, there is no limit to the number of functions registered 3979 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit 3980 // functions are called upon dlclose(3DL) in addition to return from main 3981 // and exit(3C). 3982 3983 if (PerfAllowAtExitRegistration) { 3984 // only register atexit functions if PerfAllowAtExitRegistration is set. 3985 // atexit functions can be delayed until process exit time, which 3986 // can be problematic for embedded VM situations. Embedded VMs should 3987 // call DestroyJavaVM() to assure that VM resources are released. 3988 3989 // note: perfMemory_exit_helper atexit function may be removed in 3990 // the future if the appropriate cleanup code can be added to the 3991 // VM_Exit VMOperation's doit method. 3992 if (atexit(perfMemory_exit_helper) != 0) { 3993 warning("os::init2 atexit(perfMemory_exit_helper) failed"); 3994 } 3995 } 3996 3997 // Init pset_loadavg function pointer 3998 init_pset_getloadavg_ptr(); 3999 4000 // Shared Posix initialization 4001 os::Posix::init_2(); 4002 4003 return JNI_OK; 4004 } 4005 4006 // Is a (classpath) directory empty? 4007 bool os::dir_is_empty(const char* path) { 4008 DIR *dir = NULL; 4009 struct dirent *ptr; 4010 4011 dir = opendir(path); 4012 if (dir == NULL) return true; 4013 4014 // Scan the directory 4015 bool result = true; 4016 while (result && (ptr = readdir(dir)) != NULL) { 4017 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 4018 result = false; 4019 } 4020 } 4021 closedir(dir); 4022 return result; 4023 } 4024 4025 // This code originates from JDK's sysOpen and open64_w 4026 // from src/solaris/hpi/src/system_md.c 4027 4028 int os::open(const char *path, int oflag, int mode) { 4029 if (strlen(path) > MAX_PATH - 1) { 4030 errno = ENAMETOOLONG; 4031 return -1; 4032 } 4033 int fd; 4034 4035 fd = ::open64(path, oflag, mode); 4036 if (fd == -1) return -1; 4037 4038 // If the open succeeded, the file might still be a directory 4039 { 4040 struct stat64 buf64; 4041 int ret = ::fstat64(fd, &buf64); 4042 int st_mode = buf64.st_mode; 4043 4044 if (ret != -1) { 4045 if ((st_mode & S_IFMT) == S_IFDIR) { 4046 errno = EISDIR; 4047 ::close(fd); 4048 return -1; 4049 } 4050 } else { 4051 ::close(fd); 4052 return -1; 4053 } 4054 } 4055 4056 // 32-bit Solaris systems suffer from: 4057 // 4058 // - an historical default soft limit of 256 per-process file 4059 // descriptors that is too low for many Java programs. 4060 // 4061 // - a design flaw where file descriptors created using stdio 4062 // fopen must be less than 256, _even_ when the first limit above 4063 // has been raised. This can cause calls to fopen (but not calls to 4064 // open, for example) to fail mysteriously, perhaps in 3rd party 4065 // native code (although the JDK itself uses fopen). One can hardly 4066 // criticize them for using this most standard of all functions. 4067 // 4068 // We attempt to make everything work anyways by: 4069 // 4070 // - raising the soft limit on per-process file descriptors beyond 4071 // 256 4072 // 4073 // - As of Solaris 10u4, we can request that Solaris raise the 256 4074 // stdio fopen limit by calling function enable_extended_FILE_stdio. 4075 // This is done in init_2 and recorded in enabled_extended_FILE_stdio 4076 // 4077 // - If we are stuck on an old (pre 10u4) Solaris system, we can 4078 // workaround the bug by remapping non-stdio file descriptors below 4079 // 256 to ones beyond 256, which is done below. 4080 // 4081 // See: 4082 // 1085341: 32-bit stdio routines should support file descriptors >255 4083 // 6533291: Work around 32-bit Solaris stdio limit of 256 open files 4084 // 6431278: Netbeans crash on 32 bit Solaris: need to call 4085 // enable_extended_FILE_stdio() in VM initialisation 4086 // Giri Mandalika's blog 4087 // http://technopark02.blogspot.com/2005_05_01_archive.html 4088 // 4089 #ifndef _LP64 4090 if ((!enabled_extended_FILE_stdio) && fd < 256) { 4091 int newfd = ::fcntl(fd, F_DUPFD, 256); 4092 if (newfd != -1) { 4093 ::close(fd); 4094 fd = newfd; 4095 } 4096 } 4097 #endif // 32-bit Solaris 4098 4099 // All file descriptors that are opened in the JVM and not 4100 // specifically destined for a subprocess should have the 4101 // close-on-exec flag set. If we don't set it, then careless 3rd 4102 // party native code might fork and exec without closing all 4103 // appropriate file descriptors (e.g. as we do in closeDescriptors in 4104 // UNIXProcess.c), and this in turn might: 4105 // 4106 // - cause end-of-file to fail to be detected on some file 4107 // descriptors, resulting in mysterious hangs, or 4108 // 4109 // - might cause an fopen in the subprocess to fail on a system 4110 // suffering from bug 1085341. 4111 // 4112 // (Yes, the default setting of the close-on-exec flag is a Unix 4113 // design flaw) 4114 // 4115 // See: 4116 // 1085341: 32-bit stdio routines should support file descriptors >255 4117 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed 4118 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 4119 // 4120 #ifdef FD_CLOEXEC 4121 { 4122 int flags = ::fcntl(fd, F_GETFD); 4123 if (flags != -1) { 4124 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); 4125 } 4126 } 4127 #endif 4128 4129 return fd; 4130 } 4131 4132 // create binary file, rewriting existing file if required 4133 int os::create_binary_file(const char* path, bool rewrite_existing) { 4134 int oflags = O_WRONLY | O_CREAT; 4135 if (!rewrite_existing) { 4136 oflags |= O_EXCL; 4137 } 4138 return ::open64(path, oflags, S_IREAD | S_IWRITE); 4139 } 4140 4141 // return current position of file pointer 4142 jlong os::current_file_offset(int fd) { 4143 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR); 4144 } 4145 4146 // move file pointer to the specified offset 4147 jlong os::seek_to_file_offset(int fd, jlong offset) { 4148 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET); 4149 } 4150 4151 jlong os::lseek(int fd, jlong offset, int whence) { 4152 return (jlong) ::lseek64(fd, offset, whence); 4153 } 4154 4155 int os::ftruncate(int fd, jlong length) { 4156 return ::ftruncate64(fd, length); 4157 } 4158 4159 int os::fsync(int fd) { 4160 RESTARTABLE_RETURN_INT(::fsync(fd)); 4161 } 4162 4163 int os::available(int fd, jlong *bytes) { 4164 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 4165 "Assumed _thread_in_native"); 4166 jlong cur, end; 4167 int mode; 4168 struct stat64 buf64; 4169 4170 if (::fstat64(fd, &buf64) >= 0) { 4171 mode = buf64.st_mode; 4172 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 4173 int n,ioctl_return; 4174 4175 RESTARTABLE(::ioctl(fd, FIONREAD, &n), ioctl_return); 4176 if (ioctl_return>= 0) { 4177 *bytes = n; 4178 return 1; 4179 } 4180 } 4181 } 4182 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) { 4183 return 0; 4184 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) { 4185 return 0; 4186 } else if (::lseek64(fd, cur, SEEK_SET) == -1) { 4187 return 0; 4188 } 4189 *bytes = end - cur; 4190 return 1; 4191 } 4192 4193 // Map a block of memory. 4194 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 4195 char *addr, size_t bytes, bool read_only, 4196 bool allow_exec) { 4197 int prot; 4198 int flags; 4199 4200 if (read_only) { 4201 prot = PROT_READ; 4202 flags = MAP_SHARED; 4203 } else { 4204 prot = PROT_READ | PROT_WRITE; 4205 flags = MAP_PRIVATE; 4206 } 4207 4208 if (allow_exec) { 4209 prot |= PROT_EXEC; 4210 } 4211 4212 if (addr != NULL) { 4213 flags |= MAP_FIXED; 4214 } 4215 4216 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, 4217 fd, file_offset); 4218 if (mapped_address == MAP_FAILED) { 4219 return NULL; 4220 } 4221 return mapped_address; 4222 } 4223 4224 4225 // Remap a block of memory. 4226 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 4227 char *addr, size_t bytes, bool read_only, 4228 bool allow_exec) { 4229 // same as map_memory() on this OS 4230 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 4231 allow_exec); 4232 } 4233 4234 4235 // Unmap a block of memory. 4236 bool os::pd_unmap_memory(char* addr, size_t bytes) { 4237 return munmap(addr, bytes) == 0; 4238 } 4239 4240 void os::pause() { 4241 char filename[MAX_PATH]; 4242 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 4243 jio_snprintf(filename, MAX_PATH, "%s", PauseAtStartupFile); 4244 } else { 4245 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 4246 } 4247 4248 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 4249 if (fd != -1) { 4250 struct stat buf; 4251 ::close(fd); 4252 while (::stat(filename, &buf) == 0) { 4253 (void)::poll(NULL, 0, 100); 4254 } 4255 } else { 4256 jio_fprintf(stderr, 4257 "Could not open pause file '%s', continuing immediately.\n", filename); 4258 } 4259 } 4260 4261 #ifndef PRODUCT 4262 #ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS 4263 // Turn this on if you need to trace synch operations. 4264 // Set RECORD_SYNCH_LIMIT to a large-enough value, 4265 // and call record_synch_enable and record_synch_disable 4266 // around the computation of interest. 4267 4268 void record_synch(char* name, bool returning); // defined below 4269 4270 class RecordSynch { 4271 char* _name; 4272 public: 4273 RecordSynch(char* name) :_name(name) { record_synch(_name, false); } 4274 ~RecordSynch() { record_synch(_name, true); } 4275 }; 4276 4277 #define CHECK_SYNCH_OP(ret, name, params, args, inner) \ 4278 extern "C" ret name params { \ 4279 typedef ret name##_t params; \ 4280 static name##_t* implem = NULL; \ 4281 static int callcount = 0; \ 4282 if (implem == NULL) { \ 4283 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \ 4284 if (implem == NULL) fatal(dlerror()); \ 4285 } \ 4286 ++callcount; \ 4287 RecordSynch _rs(#name); \ 4288 inner; \ 4289 return implem args; \ 4290 } 4291 // in dbx, examine callcounts this way: 4292 // for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done 4293 4294 #define CHECK_POINTER_OK(p) \ 4295 (!Universe::is_fully_initialized() || !Universe::is_reserved_heap((oop)(p))) 4296 #define CHECK_MU \ 4297 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only."); 4298 #define CHECK_CV \ 4299 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only."); 4300 #define CHECK_P(p) \ 4301 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only."); 4302 4303 #define CHECK_MUTEX(mutex_op) \ 4304 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU); 4305 4306 CHECK_MUTEX( mutex_lock) 4307 CHECK_MUTEX( _mutex_lock) 4308 CHECK_MUTEX( mutex_unlock) 4309 CHECK_MUTEX(_mutex_unlock) 4310 CHECK_MUTEX( mutex_trylock) 4311 CHECK_MUTEX(_mutex_trylock) 4312 4313 #define CHECK_COND(cond_op) \ 4314 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU; CHECK_CV); 4315 4316 CHECK_COND( cond_wait); 4317 CHECK_COND(_cond_wait); 4318 CHECK_COND(_cond_wait_cancel); 4319 4320 #define CHECK_COND2(cond_op) \ 4321 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU; CHECK_CV); 4322 4323 CHECK_COND2( cond_timedwait); 4324 CHECK_COND2(_cond_timedwait); 4325 CHECK_COND2(_cond_timedwait_cancel); 4326 4327 // do the _lwp_* versions too 4328 #define mutex_t lwp_mutex_t 4329 #define cond_t lwp_cond_t 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 CHECK_MUTEX( __lwp_mutex_trylock) 4336 CHECK_MUTEX(___lwp_mutex_lock) 4337 CHECK_MUTEX(___lwp_mutex_unlock) 4338 4339 CHECK_COND( _lwp_cond_wait); 4340 CHECK_COND( __lwp_cond_wait); 4341 CHECK_COND(___lwp_cond_wait); 4342 4343 CHECK_COND2( _lwp_cond_timedwait); 4344 CHECK_COND2( __lwp_cond_timedwait); 4345 #undef mutex_t 4346 #undef cond_t 4347 4348 CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0); 4349 CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0); 4350 CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0); 4351 CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0); 4352 CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p)); 4353 CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p)); 4354 CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV); 4355 CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV); 4356 4357 4358 // recording machinery: 4359 4360 enum { RECORD_SYNCH_LIMIT = 200 }; 4361 char* record_synch_name[RECORD_SYNCH_LIMIT]; 4362 void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT]; 4363 bool record_synch_returning[RECORD_SYNCH_LIMIT]; 4364 thread_t record_synch_thread[RECORD_SYNCH_LIMIT]; 4365 int record_synch_count = 0; 4366 bool record_synch_enabled = false; 4367 4368 // in dbx, examine recorded data this way: 4369 // for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done 4370 4371 void record_synch(char* name, bool returning) { 4372 if (record_synch_enabled) { 4373 if (record_synch_count < RECORD_SYNCH_LIMIT) { 4374 record_synch_name[record_synch_count] = name; 4375 record_synch_returning[record_synch_count] = returning; 4376 record_synch_thread[record_synch_count] = thr_self(); 4377 record_synch_arg0ptr[record_synch_count] = &name; 4378 record_synch_count++; 4379 } 4380 // put more checking code here: 4381 // ... 4382 } 4383 } 4384 4385 void record_synch_enable() { 4386 // start collecting trace data, if not already doing so 4387 if (!record_synch_enabled) record_synch_count = 0; 4388 record_synch_enabled = true; 4389 } 4390 4391 void record_synch_disable() { 4392 // stop collecting trace data 4393 record_synch_enabled = false; 4394 } 4395 4396 #endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS 4397 #endif // PRODUCT 4398 4399 const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime); 4400 const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) - 4401 (intptr_t)(&((prusage_t *)(NULL))->pr_utime); 4402 4403 4404 // JVMTI & JVM monitoring and management support 4405 // The thread_cpu_time() and current_thread_cpu_time() are only 4406 // supported if is_thread_cpu_time_supported() returns true. 4407 // They are not supported on Solaris T1. 4408 4409 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 4410 // are used by JVM M&M and JVMTI to get user+sys or user CPU time 4411 // of a thread. 4412 // 4413 // current_thread_cpu_time() and thread_cpu_time(Thread *) 4414 // returns the fast estimate available on the platform. 4415 4416 // hrtime_t gethrvtime() return value includes 4417 // user time but does not include system time 4418 jlong os::current_thread_cpu_time() { 4419 return (jlong) gethrvtime(); 4420 } 4421 4422 jlong os::thread_cpu_time(Thread *thread) { 4423 // return user level CPU time only to be consistent with 4424 // what current_thread_cpu_time returns. 4425 // thread_cpu_time_info() must be changed if this changes 4426 return os::thread_cpu_time(thread, false /* user time only */); 4427 } 4428 4429 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 4430 if (user_sys_cpu_time) { 4431 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 4432 } else { 4433 return os::current_thread_cpu_time(); 4434 } 4435 } 4436 4437 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 4438 char proc_name[64]; 4439 int count; 4440 prusage_t prusage; 4441 jlong lwp_time; 4442 int fd; 4443 4444 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage", 4445 getpid(), 4446 thread->osthread()->lwp_id()); 4447 fd = ::open(proc_name, O_RDONLY); 4448 if (fd == -1) return -1; 4449 4450 do { 4451 count = ::pread(fd, 4452 (void *)&prusage.pr_utime, 4453 thr_time_size, 4454 thr_time_off); 4455 } while (count < 0 && errno == EINTR); 4456 ::close(fd); 4457 if (count < 0) return -1; 4458 4459 if (user_sys_cpu_time) { 4460 // user + system CPU time 4461 lwp_time = (((jlong)prusage.pr_stime.tv_sec + 4462 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) + 4463 (jlong)prusage.pr_stime.tv_nsec + 4464 (jlong)prusage.pr_utime.tv_nsec; 4465 } else { 4466 // user level CPU time only 4467 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) + 4468 (jlong)prusage.pr_utime.tv_nsec; 4469 } 4470 4471 return (lwp_time); 4472 } 4473 4474 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4475 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 4476 info_ptr->may_skip_backward = false; // elapsed time not wall time 4477 info_ptr->may_skip_forward = false; // elapsed time not wall time 4478 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned 4479 } 4480 4481 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4482 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 4483 info_ptr->may_skip_backward = false; // elapsed time not wall time 4484 info_ptr->may_skip_forward = false; // elapsed time not wall time 4485 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned 4486 } 4487 4488 bool os::is_thread_cpu_time_supported() { 4489 return true; 4490 } 4491 4492 // System loadavg support. Returns -1 if load average cannot be obtained. 4493 // Return the load average for our processor set if the primitive exists 4494 // (Solaris 9 and later). Otherwise just return system wide loadavg. 4495 int os::loadavg(double loadavg[], int nelem) { 4496 if (pset_getloadavg_ptr != NULL) { 4497 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem); 4498 } else { 4499 return ::getloadavg(loadavg, nelem); 4500 } 4501 } 4502 4503 //--------------------------------------------------------------------------------- 4504 4505 bool os::find(address addr, outputStream* st) { 4506 Dl_info dlinfo; 4507 memset(&dlinfo, 0, sizeof(dlinfo)); 4508 if (dladdr(addr, &dlinfo) != 0) { 4509 st->print(PTR_FORMAT ": ", addr); 4510 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) { 4511 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr); 4512 } else if (dlinfo.dli_fbase != NULL) { 4513 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase); 4514 } else { 4515 st->print("<absolute address>"); 4516 } 4517 if (dlinfo.dli_fname != NULL) { 4518 st->print(" in %s", dlinfo.dli_fname); 4519 } 4520 if (dlinfo.dli_fbase != NULL) { 4521 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); 4522 } 4523 st->cr(); 4524 4525 if (Verbose) { 4526 // decode some bytes around the PC 4527 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size()); 4528 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); 4529 address lowest = (address) dlinfo.dli_sname; 4530 if (!lowest) lowest = (address) dlinfo.dli_fbase; 4531 if (begin < lowest) begin = lowest; 4532 Dl_info dlinfo2; 4533 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr 4534 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) { 4535 end = (address) dlinfo2.dli_saddr; 4536 } 4537 Disassembler::decode(begin, end, st); 4538 } 4539 return true; 4540 } 4541 return false; 4542 } 4543 4544 // Following function has been added to support HotSparc's libjvm.so running 4545 // under Solaris production JDK 1.2.2 / 1.3.0. These came from 4546 // src/solaris/hpi/native_threads in the EVM codebase. 4547 // 4548 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release 4549 // libraries and should thus be removed. We will leave it behind for a while 4550 // until we no longer want to able to run on top of 1.3.0 Solaris production 4551 // JDK. See 4341971. 4552 4553 #define STACK_SLACK 0x800 4554 4555 extern "C" { 4556 intptr_t sysThreadAvailableStackWithSlack() { 4557 stack_t st; 4558 intptr_t retval, stack_top; 4559 retval = thr_stksegment(&st); 4560 assert(retval == 0, "incorrect return value from thr_stksegment"); 4561 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned"); 4562 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned"); 4563 stack_top=(intptr_t)st.ss_sp-st.ss_size; 4564 return ((intptr_t)&stack_top - stack_top - STACK_SLACK); 4565 } 4566 } 4567 4568 // ObjectMonitor park-unpark infrastructure ... 4569 // 4570 // We implement Solaris and Linux PlatformEvents with the 4571 // obvious condvar-mutex-flag triple. 4572 // Another alternative that works quite well is pipes: 4573 // Each PlatformEvent consists of a pipe-pair. 4574 // The thread associated with the PlatformEvent 4575 // calls park(), which reads from the input end of the pipe. 4576 // Unpark() writes into the other end of the pipe. 4577 // The write-side of the pipe must be set NDELAY. 4578 // Unfortunately pipes consume a large # of handles. 4579 // Native solaris lwp_park() and lwp_unpark() work nicely, too. 4580 // Using pipes for the 1st few threads might be workable, however. 4581 // 4582 // park() is permitted to return spuriously. 4583 // Callers of park() should wrap the call to park() in 4584 // an appropriate loop. A litmus test for the correct 4585 // usage of park is the following: if park() were modified 4586 // to immediately return 0 your code should still work, 4587 // albeit degenerating to a spin loop. 4588 // 4589 // In a sense, park()-unpark() just provides more polite spinning 4590 // and polling with the key difference over naive spinning being 4591 // that a parked thread needs to be explicitly unparked() in order 4592 // to wake up and to poll the underlying condition. 4593 // 4594 // Assumption: 4595 // Only one parker can exist on an event, which is why we allocate 4596 // them per-thread. Multiple unparkers can coexist. 4597 // 4598 // _Event transitions in park() 4599 // -1 => -1 : illegal 4600 // 1 => 0 : pass - return immediately 4601 // 0 => -1 : block; then set _Event to 0 before returning 4602 // 4603 // _Event transitions in unpark() 4604 // 0 => 1 : just return 4605 // 1 => 1 : just return 4606 // -1 => either 0 or 1; must signal target thread 4607 // That is, we can safely transition _Event from -1 to either 4608 // 0 or 1. 4609 // 4610 // _Event serves as a restricted-range semaphore. 4611 // -1 : thread is blocked, i.e. there is a waiter 4612 // 0 : neutral: thread is running or ready, 4613 // could have been signaled after a wait started 4614 // 1 : signaled - thread is running or ready 4615 // 4616 // Another possible encoding of _Event would be with 4617 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits. 4618 // 4619 // TODO-FIXME: add DTRACE probes for: 4620 // 1. Tx parks 4621 // 2. Ty unparks Tx 4622 // 3. Tx resumes from park 4623 4624 4625 // value determined through experimentation 4626 #define ROUNDINGFIX 11 4627 4628 // utility to compute the abstime argument to timedwait. 4629 // TODO-FIXME: switch from compute_abstime() to unpackTime(). 4630 4631 static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) { 4632 // millis is the relative timeout time 4633 // abstime will be the absolute timeout time 4634 if (millis < 0) millis = 0; 4635 struct timeval now; 4636 int status = gettimeofday(&now, NULL); 4637 assert(status == 0, "gettimeofday"); 4638 jlong seconds = millis / 1000; 4639 jlong max_wait_period; 4640 4641 if (UseLWPSynchronization) { 4642 // forward port of fix for 4275818 (not sleeping long enough) 4643 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where 4644 // _lwp_cond_timedwait() used a round_down algorithm rather 4645 // than a round_up. For millis less than our roundfactor 4646 // it rounded down to 0 which doesn't meet the spec. 4647 // For millis > roundfactor we may return a bit sooner, but 4648 // since we can not accurately identify the patch level and 4649 // this has already been fixed in Solaris 9 and 8 we will 4650 // leave it alone rather than always rounding down. 4651 4652 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX; 4653 // It appears that when we go directly through Solaris _lwp_cond_timedwait() 4654 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6 4655 max_wait_period = 21000000; 4656 } else { 4657 max_wait_period = 50000000; 4658 } 4659 millis %= 1000; 4660 if (seconds > max_wait_period) { // see man cond_timedwait(3T) 4661 seconds = max_wait_period; 4662 } 4663 abstime->tv_sec = now.tv_sec + seconds; 4664 long usec = now.tv_usec + millis * 1000; 4665 if (usec >= 1000000) { 4666 abstime->tv_sec += 1; 4667 usec -= 1000000; 4668 } 4669 abstime->tv_nsec = usec * 1000; 4670 return abstime; 4671 } 4672 4673 void os::PlatformEvent::park() { // AKA: down() 4674 // Transitions for _Event: 4675 // -1 => -1 : illegal 4676 // 1 => 0 : pass - return immediately 4677 // 0 => -1 : block; then set _Event to 0 before returning 4678 4679 // Invariant: Only the thread associated with the Event/PlatformEvent 4680 // may call park(). 4681 assert(_nParked == 0, "invariant"); 4682 4683 int v; 4684 for (;;) { 4685 v = _Event; 4686 if (Atomic::cmpxchg(&_Event, v, v-1) == v) break; 4687 } 4688 guarantee(v >= 0, "invariant"); 4689 if (v == 0) { 4690 // Do this the hard way by blocking ... 4691 // See http://monaco.sfbay/detail.jsf?cr=5094058. 4692 int status = os::Solaris::mutex_lock(_mutex); 4693 assert_status(status == 0, status, "mutex_lock"); 4694 guarantee(_nParked == 0, "invariant"); 4695 ++_nParked; 4696 while (_Event < 0) { 4697 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... 4698 // Treat this the same as if the wait was interrupted 4699 // With usr/lib/lwp going to kernel, always handle ETIME 4700 status = os::Solaris::cond_wait(_cond, _mutex); 4701 if (status == ETIME) status = EINTR; 4702 assert_status(status == 0 || status == EINTR, status, "cond_wait"); 4703 } 4704 --_nParked; 4705 _Event = 0; 4706 status = os::Solaris::mutex_unlock(_mutex); 4707 assert_status(status == 0, status, "mutex_unlock"); 4708 // Paranoia to ensure our locked and lock-free paths interact 4709 // correctly with each other. 4710 OrderAccess::fence(); 4711 } 4712 } 4713 4714 int os::PlatformEvent::park(jlong millis) { 4715 // Transitions for _Event: 4716 // -1 => -1 : illegal 4717 // 1 => 0 : pass - return immediately 4718 // 0 => -1 : block; then set _Event to 0 before returning 4719 4720 guarantee(_nParked == 0, "invariant"); 4721 int v; 4722 for (;;) { 4723 v = _Event; 4724 if (Atomic::cmpxchg(&_Event, v, v-1) == v) break; 4725 } 4726 guarantee(v >= 0, "invariant"); 4727 if (v != 0) return OS_OK; 4728 4729 int ret = OS_TIMEOUT; 4730 timestruc_t abst; 4731 compute_abstime(&abst, millis); 4732 4733 // See http://monaco.sfbay/detail.jsf?cr=5094058. 4734 int status = os::Solaris::mutex_lock(_mutex); 4735 assert_status(status == 0, status, "mutex_lock"); 4736 guarantee(_nParked == 0, "invariant"); 4737 ++_nParked; 4738 while (_Event < 0) { 4739 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst); 4740 assert_status(status == 0 || status == EINTR || 4741 status == ETIME || status == ETIMEDOUT, 4742 status, "cond_timedwait"); 4743 if (!FilterSpuriousWakeups) break; // previous semantics 4744 if (status == ETIME || status == ETIMEDOUT) break; 4745 // We consume and ignore EINTR and spurious wakeups. 4746 } 4747 --_nParked; 4748 if (_Event >= 0) ret = OS_OK; 4749 _Event = 0; 4750 status = os::Solaris::mutex_unlock(_mutex); 4751 assert_status(status == 0, status, "mutex_unlock"); 4752 // Paranoia to ensure our locked and lock-free paths interact 4753 // correctly with each other. 4754 OrderAccess::fence(); 4755 return ret; 4756 } 4757 4758 void os::PlatformEvent::unpark() { 4759 // Transitions for _Event: 4760 // 0 => 1 : just return 4761 // 1 => 1 : just return 4762 // -1 => either 0 or 1; must signal target thread 4763 // That is, we can safely transition _Event from -1 to either 4764 // 0 or 1. 4765 // See also: "Semaphores in Plan 9" by Mullender & Cox 4766 // 4767 // Note: Forcing a transition from "-1" to "1" on an unpark() means 4768 // that it will take two back-to-back park() calls for the owning 4769 // thread to block. This has the benefit of forcing a spurious return 4770 // from the first park() call after an unpark() call which will help 4771 // shake out uses of park() and unpark() without condition variables. 4772 4773 if (Atomic::xchg(&_Event, 1) >= 0) return; 4774 4775 // If the thread associated with the event was parked, wake it. 4776 // Wait for the thread assoc with the PlatformEvent to vacate. 4777 int status = os::Solaris::mutex_lock(_mutex); 4778 assert_status(status == 0, status, "mutex_lock"); 4779 int AnyWaiters = _nParked; 4780 status = os::Solaris::mutex_unlock(_mutex); 4781 assert_status(status == 0, status, "mutex_unlock"); 4782 guarantee(AnyWaiters == 0 || AnyWaiters == 1, "invariant"); 4783 if (AnyWaiters != 0) { 4784 // Note that we signal() *after* dropping the lock for "immortal" Events. 4785 // This is safe and avoids a common class of futile wakeups. In rare 4786 // circumstances this can cause a thread to return prematurely from 4787 // cond_{timed}wait() but the spurious wakeup is benign and the victim 4788 // will simply re-test the condition and re-park itself. 4789 // This provides particular benefit if the underlying platform does not 4790 // provide wait morphing. 4791 status = os::Solaris::cond_signal(_cond); 4792 assert_status(status == 0, status, "cond_signal"); 4793 } 4794 } 4795 4796 // JSR166 4797 // ------------------------------------------------------- 4798 4799 // The solaris and linux implementations of park/unpark are fairly 4800 // conservative for now, but can be improved. They currently use a 4801 // mutex/condvar pair, plus _counter. 4802 // Park decrements _counter if > 0, else does a condvar wait. Unpark 4803 // sets count to 1 and signals condvar. Only one thread ever waits 4804 // on the condvar. Contention seen when trying to park implies that someone 4805 // is unparking you, so don't wait. And spurious returns are fine, so there 4806 // is no need to track notifications. 4807 4808 #define MAX_SECS 100000000 4809 4810 // This code is common to linux and solaris and will be moved to a 4811 // common place in dolphin. 4812 // 4813 // The passed in time value is either a relative time in nanoseconds 4814 // or an absolute time in milliseconds. Either way it has to be unpacked 4815 // into suitable seconds and nanoseconds components and stored in the 4816 // given timespec structure. 4817 // Given time is a 64-bit value and the time_t used in the timespec is only 4818 // a signed-32-bit value (except on 64-bit Linux) we have to watch for 4819 // overflow if times way in the future are given. Further on Solaris versions 4820 // prior to 10 there is a restriction (see cond_timedwait) that the specified 4821 // number of seconds, in abstime, is less than current_time + 100,000,000. 4822 // As it will be 28 years before "now + 100000000" will overflow we can 4823 // ignore overflow and just impose a hard-limit on seconds using the value 4824 // of "now + 100,000,000". This places a limit on the timeout of about 3.17 4825 // years from "now". 4826 // 4827 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) { 4828 assert(time > 0, "convertTime"); 4829 4830 struct timeval now; 4831 int status = gettimeofday(&now, NULL); 4832 assert(status == 0, "gettimeofday"); 4833 4834 time_t max_secs = now.tv_sec + MAX_SECS; 4835 4836 if (isAbsolute) { 4837 jlong secs = time / 1000; 4838 if (secs > max_secs) { 4839 absTime->tv_sec = max_secs; 4840 } else { 4841 absTime->tv_sec = secs; 4842 } 4843 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; 4844 } else { 4845 jlong secs = time / NANOSECS_PER_SEC; 4846 if (secs >= MAX_SECS) { 4847 absTime->tv_sec = max_secs; 4848 absTime->tv_nsec = 0; 4849 } else { 4850 absTime->tv_sec = now.tv_sec + secs; 4851 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; 4852 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { 4853 absTime->tv_nsec -= NANOSECS_PER_SEC; 4854 ++absTime->tv_sec; // note: this must be <= max_secs 4855 } 4856 } 4857 } 4858 assert(absTime->tv_sec >= 0, "tv_sec < 0"); 4859 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); 4860 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); 4861 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); 4862 } 4863 4864 void Parker::park(bool isAbsolute, jlong time) { 4865 // Ideally we'd do something useful while spinning, such 4866 // as calling unpackTime(). 4867 4868 // Optional fast-path check: 4869 // Return immediately if a permit is available. 4870 // We depend on Atomic::xchg() having full barrier semantics 4871 // since we are doing a lock-free update to _counter. 4872 if (Atomic::xchg(&_counter, 0) > 0) return; 4873 4874 // Optional fast-exit: Check interrupt before trying to wait 4875 Thread* thread = Thread::current(); 4876 assert(thread->is_Java_thread(), "Must be JavaThread"); 4877 JavaThread *jt = (JavaThread *)thread; 4878 if (jt->is_interrupted(false)) { 4879 return; 4880 } 4881 4882 // First, demultiplex/decode time arguments 4883 timespec absTime; 4884 if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all 4885 return; 4886 } 4887 if (time > 0) { 4888 // Warning: this code might be exposed to the old Solaris time 4889 // round-down bugs. Grep "roundingFix" for details. 4890 unpackTime(&absTime, isAbsolute, time); 4891 } 4892 4893 // Enter safepoint region 4894 // Beware of deadlocks such as 6317397. 4895 // The per-thread Parker:: _mutex is a classic leaf-lock. 4896 // In particular a thread must never block on the Threads_lock while 4897 // holding the Parker:: mutex. If safepoints are pending both the 4898 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. 4899 ThreadBlockInVM tbivm(jt); 4900 4901 // Can't access interrupt state now that we are _thread_blocked. If we've 4902 // been interrupted since we checked above then _counter will be > 0. 4903 4904 // Don't wait if cannot get lock since interference arises from 4905 // unblocking. 4906 if (os::Solaris::mutex_trylock(_mutex) != 0) { 4907 return; 4908 } 4909 4910 int status; 4911 4912 if (_counter > 0) { // no wait needed 4913 _counter = 0; 4914 status = os::Solaris::mutex_unlock(_mutex); 4915 assert(status == 0, "invariant"); 4916 // Paranoia to ensure our locked and lock-free paths interact 4917 // correctly with each other and Java-level accesses. 4918 OrderAccess::fence(); 4919 return; 4920 } 4921 4922 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 4923 jt->set_suspend_equivalent(); 4924 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 4925 4926 // Do this the hard way by blocking ... 4927 // See http://monaco.sfbay/detail.jsf?cr=5094058. 4928 if (time == 0) { 4929 status = os::Solaris::cond_wait(_cond, _mutex); 4930 } else { 4931 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime); 4932 } 4933 // Note that an untimed cond_wait() can sometimes return ETIME on older 4934 // versions of the Solaris. 4935 assert_status(status == 0 || status == EINTR || 4936 status == ETIME || status == ETIMEDOUT, 4937 status, "cond_timedwait"); 4938 4939 _counter = 0; 4940 status = os::Solaris::mutex_unlock(_mutex); 4941 assert_status(status == 0, status, "mutex_unlock"); 4942 // Paranoia to ensure our locked and lock-free paths interact 4943 // correctly with each other and Java-level accesses. 4944 OrderAccess::fence(); 4945 4946 // If externally suspended while waiting, re-suspend 4947 if (jt->handle_special_suspend_equivalent_condition()) { 4948 jt->java_suspend_self(); 4949 } 4950 } 4951 4952 void Parker::unpark() { 4953 int status = os::Solaris::mutex_lock(_mutex); 4954 assert(status == 0, "invariant"); 4955 const int s = _counter; 4956 _counter = 1; 4957 status = os::Solaris::mutex_unlock(_mutex); 4958 assert(status == 0, "invariant"); 4959 4960 if (s < 1) { 4961 status = os::Solaris::cond_signal(_cond); 4962 assert(status == 0, "invariant"); 4963 } 4964 } 4965 4966 // Platform Mutex/Monitor implementations 4967 4968 os::PlatformMutex::PlatformMutex() { 4969 int status = os::Solaris::mutex_init(&_mutex); 4970 assert_status(status == 0, status, "mutex_init"); 4971 } 4972 4973 os::PlatformMutex::~PlatformMutex() { 4974 int status = os::Solaris::mutex_destroy(&_mutex); 4975 assert_status(status == 0, status, "mutex_destroy"); 4976 } 4977 4978 void os::PlatformMutex::lock() { 4979 int status = os::Solaris::mutex_lock(&_mutex); 4980 assert_status(status == 0, status, "mutex_lock"); 4981 } 4982 4983 void os::PlatformMutex::unlock() { 4984 int status = os::Solaris::mutex_unlock(&_mutex); 4985 assert_status(status == 0, status, "mutex_unlock"); 4986 } 4987 4988 bool os::PlatformMutex::try_lock() { 4989 int status = os::Solaris::mutex_trylock(&_mutex); 4990 assert_status(status == 0 || status == EBUSY, status, "mutex_trylock"); 4991 return status == 0; 4992 } 4993 4994 os::PlatformMonitor::PlatformMonitor() { 4995 int status = os::Solaris::cond_init(&_cond); 4996 assert_status(status == 0, status, "cond_init"); 4997 } 4998 4999 os::PlatformMonitor::~PlatformMonitor() { 5000 int status = os::Solaris::cond_destroy(&_cond); 5001 assert_status(status == 0, status, "cond_destroy"); 5002 } 5003 5004 // Must already be locked 5005 int os::PlatformMonitor::wait(jlong millis) { 5006 assert(millis >= 0, "negative timeout"); 5007 if (millis > 0) { 5008 timestruc_t abst; 5009 int ret = OS_TIMEOUT; 5010 compute_abstime(&abst, millis); 5011 int status = os::Solaris::cond_timedwait(&_cond, &_mutex, &abst); 5012 assert_status(status == 0 || status == EINTR || 5013 status == ETIME || status == ETIMEDOUT, 5014 status, "cond_timedwait"); 5015 // EINTR acts as spurious wakeup - which is permitted anyway 5016 if (status == 0 || status == EINTR) { 5017 ret = OS_OK; 5018 } 5019 return ret; 5020 } else { 5021 int status = os::Solaris::cond_wait(&_cond, &_mutex); 5022 assert_status(status == 0 || status == EINTR, 5023 status, "cond_wait"); 5024 return OS_OK; 5025 } 5026 } 5027 5028 void os::PlatformMonitor::notify() { 5029 int status = os::Solaris::cond_signal(&_cond); 5030 assert_status(status == 0, status, "cond_signal"); 5031 } 5032 5033 void os::PlatformMonitor::notify_all() { 5034 int status = os::Solaris::cond_broadcast(&_cond); 5035 assert_status(status == 0, status, "cond_broadcast"); 5036 } 5037 5038 extern char** environ; 5039 5040 // Run the specified command in a separate process. Return its exit value, 5041 // or -1 on failure (e.g. can't fork a new process). 5042 // Unlike system(), this function can be called from signal handler. It 5043 // doesn't block SIGINT et al. 5044 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) { 5045 char * argv[4]; 5046 argv[0] = (char *)"sh"; 5047 argv[1] = (char *)"-c"; 5048 argv[2] = cmd; 5049 argv[3] = NULL; 5050 5051 // fork is async-safe, fork1 is not so can't use in signal handler 5052 pid_t pid; 5053 Thread* t = Thread::current_or_null_safe(); 5054 if (t != NULL && t->is_inside_signal_handler()) { 5055 pid = fork(); 5056 } else { 5057 pid = fork1(); 5058 } 5059 5060 if (pid < 0) { 5061 // fork failed 5062 warning("fork failed: %s", os::strerror(errno)); 5063 return -1; 5064 5065 } else if (pid == 0) { 5066 // child process 5067 5068 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris 5069 execve("/usr/bin/sh", argv, environ); 5070 5071 // execve failed 5072 _exit(-1); 5073 5074 } else { 5075 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 5076 // care about the actual exit code, for now. 5077 5078 int status; 5079 5080 // Wait for the child process to exit. This returns immediately if 5081 // the child has already exited. */ 5082 while (waitpid(pid, &status, 0) < 0) { 5083 switch (errno) { 5084 case ECHILD: return 0; 5085 case EINTR: break; 5086 default: return -1; 5087 } 5088 } 5089 5090 if (WIFEXITED(status)) { 5091 // The child exited normally; get its exit code. 5092 return WEXITSTATUS(status); 5093 } else if (WIFSIGNALED(status)) { 5094 // The child exited because of a signal 5095 // The best value to return is 0x80 + signal number, 5096 // because that is what all Unix shells do, and because 5097 // it allows callers to distinguish between process exit and 5098 // process death by signal. 5099 return 0x80 + WTERMSIG(status); 5100 } else { 5101 // Unknown exit code; pass it through 5102 return status; 5103 } 5104 } 5105 } 5106 5107 size_t os::write(int fd, const void *buf, unsigned int nBytes) { 5108 size_t res; 5109 RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res); 5110 return res; 5111 } 5112 5113 int os::close(int fd) { 5114 return ::close(fd); 5115 } 5116 5117 int os::socket_close(int fd) { 5118 return ::close(fd); 5119 } 5120 5121 int os::recv(int fd, char* buf, size_t nBytes, uint flags) { 5122 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 5123 "Assumed _thread_in_native"); 5124 RESTARTABLE_RETURN_INT((int)::recv(fd, buf, nBytes, flags)); 5125 } 5126 5127 int os::send(int fd, char* buf, size_t nBytes, uint flags) { 5128 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 5129 "Assumed _thread_in_native"); 5130 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags)); 5131 } 5132 5133 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) { 5134 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags)); 5135 } 5136 5137 // As both poll and select can be interrupted by signals, we have to be 5138 // prepared to restart the system call after updating the timeout, unless 5139 // a poll() is done with timeout == -1, in which case we repeat with this 5140 // "wait forever" value. 5141 5142 int os::connect(int fd, struct sockaddr *him, socklen_t len) { 5143 int _result; 5144 _result = ::connect(fd, him, len); 5145 5146 // On Solaris, when a connect() call is interrupted, the connection 5147 // can be established asynchronously (see 6343810). Subsequent calls 5148 // to connect() must check the errno value which has the semantic 5149 // described below (copied from the connect() man page). Handling 5150 // of asynchronously established connections is required for both 5151 // blocking and non-blocking sockets. 5152 // EINTR The connection attempt was interrupted 5153 // before any data arrived by the delivery of 5154 // a signal. The connection, however, will be 5155 // established asynchronously. 5156 // 5157 // EINPROGRESS The socket is non-blocking, and the connec- 5158 // tion cannot be completed immediately. 5159 // 5160 // EALREADY The socket is non-blocking, and a previous 5161 // connection attempt has not yet been com- 5162 // pleted. 5163 // 5164 // EISCONN The socket is already connected. 5165 if (_result == OS_ERR && errno == EINTR) { 5166 // restarting a connect() changes its errno semantics 5167 RESTARTABLE(::connect(fd, him, len), _result); 5168 // undo these changes 5169 if (_result == OS_ERR) { 5170 if (errno == EALREADY) { 5171 errno = EINPROGRESS; // fall through 5172 } else if (errno == EISCONN) { 5173 errno = 0; 5174 return OS_OK; 5175 } 5176 } 5177 } 5178 return _result; 5179 } 5180 5181 // Get the default path to the core file 5182 // Returns the length of the string 5183 int os::get_core_path(char* buffer, size_t bufferSize) { 5184 const char* p = get_current_directory(buffer, bufferSize); 5185 5186 if (p == NULL) { 5187 assert(p != NULL, "failed to get current directory"); 5188 return 0; 5189 } 5190 5191 jio_snprintf(buffer, bufferSize, "%s/core or core.%d", 5192 p, current_process_id()); 5193 5194 return strlen(buffer); 5195 } 5196 5197 bool os::supports_map_sync() { 5198 return false; 5199 } 5200 5201 #ifndef PRODUCT 5202 void TestReserveMemorySpecial_test() { 5203 // No tests available for this platform 5204 } 5205 #endif 5206 5207 bool os::start_debugging(char *buf, int buflen) { 5208 int len = (int)strlen(buf); 5209 char *p = &buf[len]; 5210 5211 jio_snprintf(p, buflen-len, 5212 "\n\n" 5213 "Do you want to debug the problem?\n\n" 5214 "To debug, run 'dbx - %d'; then switch to thread " INTX_FORMAT "\n" 5215 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n" 5216 "Otherwise, press RETURN to abort...", 5217 os::current_process_id(), os::current_thread_id()); 5218 5219 bool yes = os::message_box("Unexpected Error", buf); 5220 5221 if (yes) { 5222 // yes, user asked VM to launch debugger 5223 jio_snprintf(buf, sizeof(buf), "dbx - %d", os::current_process_id()); 5224 5225 os::fork_and_exec(buf); 5226 yes = false; 5227 } 5228 return yes; 5229 }