1 /* 2 * Copyright (c) 1997, 2019, 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 bool os::Solaris::valid_stack_address(Thread* thread, address sp) { 543 address stackStart = (address)thread->stack_base(); 544 address stackEnd = (address)(stackStart - (address)thread->stack_size()); 545 if (sp < stackStart && sp >= stackEnd) return true; 546 return false; 547 } 548 549 extern "C" void breakpoint() { 550 // use debugger to set breakpoint here 551 } 552 553 static thread_t main_thread; 554 555 // Thread start routine for all newly created threads 556 extern "C" void* thread_native_entry(void* thread_addr) { 557 558 Thread* thread = (Thread*)thread_addr; 559 560 thread->record_stack_base_and_size(); 561 562 // Try to randomize the cache line index of hot stack frames. 563 // This helps when threads of the same stack traces evict each other's 564 // cache lines. The threads can be either from the same JVM instance, or 565 // from different JVM instances. The benefit is especially true for 566 // processors with hyperthreading technology. 567 static int counter = 0; 568 int pid = os::current_process_id(); 569 alloca(((pid ^ counter++) & 7) * 128); 570 571 int prio; 572 573 thread->initialize_thread_current(); 574 575 OSThread* osthr = thread->osthread(); 576 577 osthr->set_lwp_id(_lwp_self()); // Store lwp in case we are bound 578 579 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ").", 580 os::current_thread_id()); 581 582 if (UseNUMA) { 583 int lgrp_id = os::numa_get_group_id(); 584 if (lgrp_id != -1) { 585 thread->set_lgrp_id(lgrp_id); 586 } 587 } 588 589 // Our priority was set when we were created, and stored in the 590 // osthread, but couldn't be passed through to our LWP until now. 591 // So read back the priority and set it again. 592 593 if (osthr->thread_id() != -1) { 594 if (UseThreadPriorities) { 595 int prio = osthr->native_priority(); 596 if (ThreadPriorityVerbose) { 597 tty->print_cr("Starting Thread " INTPTR_FORMAT ", LWP is " 598 INTPTR_FORMAT ", setting priority: %d\n", 599 osthr->thread_id(), osthr->lwp_id(), prio); 600 } 601 os::set_native_priority(thread, prio); 602 } 603 } else if (ThreadPriorityVerbose) { 604 warning("Can't set priority in _start routine, thread id hasn't been set\n"); 605 } 606 607 assert(osthr->get_state() == RUNNABLE, "invalid os thread state"); 608 609 // initialize signal mask for this thread 610 os::Solaris::hotspot_sigmask(thread); 611 612 os::Solaris::init_thread_fpu_state(); 613 std::set_terminate(_handle_uncaught_cxx_exception); 614 615 thread->call_run(); 616 617 // Note: at this point the thread object may already have deleted itself. 618 // Do not dereference it from here on out. 619 620 // One less thread is executing 621 // When the VMThread gets here, the main thread may have already exited 622 // which frees the CodeHeap containing the Atomic::dec code 623 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) { 624 Atomic::dec(&os::Solaris::_os_thread_count); 625 } 626 627 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ").", os::current_thread_id()); 628 629 if (UseDetachedThreads) { 630 thr_exit(NULL); 631 ShouldNotReachHere(); 632 } 633 return NULL; 634 } 635 636 static OSThread* create_os_thread(Thread* thread, thread_t thread_id) { 637 // Allocate the OSThread object 638 OSThread* osthread = new OSThread(NULL, NULL); 639 if (osthread == NULL) return NULL; 640 641 // Store info on the Solaris thread into the OSThread 642 osthread->set_thread_id(thread_id); 643 osthread->set_lwp_id(_lwp_self()); 644 645 if (UseNUMA) { 646 int lgrp_id = os::numa_get_group_id(); 647 if (lgrp_id != -1) { 648 thread->set_lgrp_id(lgrp_id); 649 } 650 } 651 652 if (ThreadPriorityVerbose) { 653 tty->print_cr("In create_os_thread, Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT "\n", 654 osthread->thread_id(), osthread->lwp_id()); 655 } 656 657 // Initial thread state is INITIALIZED, not SUSPENDED 658 osthread->set_state(INITIALIZED); 659 660 return osthread; 661 } 662 663 void os::Solaris::hotspot_sigmask(Thread* thread) { 664 //Save caller's signal mask 665 sigset_t sigmask; 666 pthread_sigmask(SIG_SETMASK, NULL, &sigmask); 667 OSThread *osthread = thread->osthread(); 668 osthread->set_caller_sigmask(sigmask); 669 670 pthread_sigmask(SIG_UNBLOCK, os::Solaris::unblocked_signals(), NULL); 671 if (!ReduceSignalUsage) { 672 if (thread->is_VM_thread()) { 673 // Only the VM thread handles BREAK_SIGNAL ... 674 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); 675 } else { 676 // ... all other threads block BREAK_SIGNAL 677 assert(!sigismember(vm_signals(), SIGINT), "SIGINT should not be blocked"); 678 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); 679 } 680 } 681 } 682 683 bool os::create_attached_thread(JavaThread* thread) { 684 #ifdef ASSERT 685 thread->verify_not_published(); 686 #endif 687 OSThread* osthread = create_os_thread(thread, thr_self()); 688 if (osthread == NULL) { 689 return false; 690 } 691 692 // Initial thread state is RUNNABLE 693 osthread->set_state(RUNNABLE); 694 thread->set_osthread(osthread); 695 696 // initialize signal mask for this thread 697 // and save the caller's signal mask 698 os::Solaris::hotspot_sigmask(thread); 699 700 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ").", 701 os::current_thread_id()); 702 703 return true; 704 } 705 706 bool os::create_main_thread(JavaThread* thread) { 707 #ifdef ASSERT 708 thread->verify_not_published(); 709 #endif 710 if (_starting_thread == NULL) { 711 _starting_thread = create_os_thread(thread, main_thread); 712 if (_starting_thread == NULL) { 713 return false; 714 } 715 } 716 717 // The primodial thread is runnable from the start 718 _starting_thread->set_state(RUNNABLE); 719 720 thread->set_osthread(_starting_thread); 721 722 // initialize signal mask for this thread 723 // and save the caller's signal mask 724 os::Solaris::hotspot_sigmask(thread); 725 726 return true; 727 } 728 729 // Helper function to trace thread attributes, similar to os::Posix::describe_pthread_attr() 730 static char* describe_thr_create_attributes(char* buf, size_t buflen, 731 size_t stacksize, long flags) { 732 stringStream ss(buf, buflen); 733 ss.print("stacksize: " SIZE_FORMAT "k, ", stacksize / 1024); 734 ss.print("flags: "); 735 #define PRINT_FLAG(f) if (flags & f) ss.print( #f " "); 736 #define ALL(X) \ 737 X(THR_SUSPENDED) \ 738 X(THR_DETACHED) \ 739 X(THR_BOUND) \ 740 X(THR_NEW_LWP) \ 741 X(THR_DAEMON) 742 ALL(PRINT_FLAG) 743 #undef ALL 744 #undef PRINT_FLAG 745 return buf; 746 } 747 748 // return default stack size for thr_type 749 size_t os::Posix::default_stack_size(os::ThreadType thr_type) { 750 // default stack size when not specified by caller is 1M (2M for LP64) 751 size_t s = (BytesPerWord >> 2) * K * K; 752 return s; 753 } 754 755 bool os::create_thread(Thread* thread, ThreadType thr_type, 756 size_t req_stack_size) { 757 // Allocate the OSThread object 758 OSThread* osthread = new OSThread(NULL, NULL); 759 if (osthread == NULL) { 760 return false; 761 } 762 763 if (ThreadPriorityVerbose) { 764 char *thrtyp; 765 switch (thr_type) { 766 case vm_thread: 767 thrtyp = (char *)"vm"; 768 break; 769 case cgc_thread: 770 thrtyp = (char *)"cgc"; 771 break; 772 case pgc_thread: 773 thrtyp = (char *)"pgc"; 774 break; 775 case java_thread: 776 thrtyp = (char *)"java"; 777 break; 778 case compiler_thread: 779 thrtyp = (char *)"compiler"; 780 break; 781 case watcher_thread: 782 thrtyp = (char *)"watcher"; 783 break; 784 default: 785 thrtyp = (char *)"unknown"; 786 break; 787 } 788 tty->print_cr("In create_thread, creating a %s thread\n", thrtyp); 789 } 790 791 // calculate stack size if it's not specified by caller 792 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size); 793 794 // Initial state is ALLOCATED but not INITIALIZED 795 osthread->set_state(ALLOCATED); 796 797 if (os::Solaris::_os_thread_count > os::Solaris::_os_thread_limit) { 798 // We got lots of threads. Check if we still have some address space left. 799 // Need to be at least 5Mb of unreserved address space. We do check by 800 // trying to reserve some. 801 const size_t VirtualMemoryBangSize = 20*K*K; 802 char* mem = os::reserve_memory(VirtualMemoryBangSize); 803 if (mem == NULL) { 804 delete osthread; 805 return false; 806 } else { 807 // Release the memory again 808 os::release_memory(mem, VirtualMemoryBangSize); 809 } 810 } 811 812 // Setup osthread because the child thread may need it. 813 thread->set_osthread(osthread); 814 815 // Create the Solaris thread 816 thread_t tid = 0; 817 long flags = (UseDetachedThreads ? THR_DETACHED : 0) | THR_SUSPENDED; 818 int status; 819 820 // Mark that we don't have an lwp or thread id yet. 821 // In case we attempt to set the priority before the thread starts. 822 osthread->set_lwp_id(-1); 823 osthread->set_thread_id(-1); 824 825 status = thr_create(NULL, stack_size, thread_native_entry, thread, flags, &tid); 826 827 char buf[64]; 828 if (status == 0) { 829 log_info(os, thread)("Thread started (tid: " UINTX_FORMAT ", attributes: %s). ", 830 (uintx) tid, describe_thr_create_attributes(buf, sizeof(buf), stack_size, flags)); 831 } else { 832 log_warning(os, thread)("Failed to start thread - thr_create failed (%s) for attributes: %s.", 833 os::errno_name(status), describe_thr_create_attributes(buf, sizeof(buf), stack_size, flags)); 834 // Log some OS information which might explain why creating the thread failed. 835 log_info(os, thread)("Number of threads approx. running in the VM: %d", Threads::number_of_threads()); 836 LogStream st(Log(os, thread)::info()); 837 os::Posix::print_rlimit_info(&st); 838 os::print_memory_info(&st); 839 } 840 841 if (status != 0) { 842 thread->set_osthread(NULL); 843 // Need to clean up stuff we've allocated so far 844 delete osthread; 845 return false; 846 } 847 848 Atomic::inc(&os::Solaris::_os_thread_count); 849 850 // Store info on the Solaris thread into the OSThread 851 osthread->set_thread_id(tid); 852 853 // Remember that we created this thread so we can set priority on it 854 osthread->set_vm_created(); 855 856 // Most thread types will set an explicit priority before starting the thread, 857 // but for those that don't we need a valid value to read back in thread_native_entry. 858 osthread->set_native_priority(NormPriority); 859 860 // Initial thread state is INITIALIZED, not SUSPENDED 861 osthread->set_state(INITIALIZED); 862 863 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain 864 return true; 865 } 866 867 debug_only(static bool signal_sets_initialized = false); 868 static sigset_t unblocked_sigs, vm_sigs; 869 870 void os::Solaris::signal_sets_init() { 871 // Should also have an assertion stating we are still single-threaded. 872 assert(!signal_sets_initialized, "Already initialized"); 873 // Fill in signals that are necessarily unblocked for all threads in 874 // the VM. Currently, we unblock the following signals: 875 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden 876 // by -Xrs (=ReduceSignalUsage)); 877 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all 878 // other threads. The "ReduceSignalUsage" boolean tells us not to alter 879 // the dispositions or masks wrt these signals. 880 // Programs embedding the VM that want to use the above signals for their 881 // own purposes must, at this time, use the "-Xrs" option to prevent 882 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. 883 // (See bug 4345157, and other related bugs). 884 // In reality, though, unblocking these signals is really a nop, since 885 // these signals are not blocked by default. 886 sigemptyset(&unblocked_sigs); 887 sigaddset(&unblocked_sigs, SIGILL); 888 sigaddset(&unblocked_sigs, SIGSEGV); 889 sigaddset(&unblocked_sigs, SIGBUS); 890 sigaddset(&unblocked_sigs, SIGFPE); 891 sigaddset(&unblocked_sigs, ASYNC_SIGNAL); 892 893 if (!ReduceSignalUsage) { 894 if (!os::Posix::is_sig_ignored(SHUTDOWN1_SIGNAL)) { 895 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); 896 } 897 if (!os::Posix::is_sig_ignored(SHUTDOWN2_SIGNAL)) { 898 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); 899 } 900 if (!os::Posix::is_sig_ignored(SHUTDOWN3_SIGNAL)) { 901 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); 902 } 903 } 904 // Fill in signals that are blocked by all but the VM thread. 905 sigemptyset(&vm_sigs); 906 if (!ReduceSignalUsage) { 907 sigaddset(&vm_sigs, BREAK_SIGNAL); 908 } 909 debug_only(signal_sets_initialized = true); 910 911 // For diagnostics only used in run_periodic_checks 912 sigemptyset(&check_signal_done); 913 } 914 915 // These are signals that are unblocked while a thread is running Java. 916 // (For some reason, they get blocked by default.) 917 sigset_t* os::Solaris::unblocked_signals() { 918 assert(signal_sets_initialized, "Not initialized"); 919 return &unblocked_sigs; 920 } 921 922 // These are the signals that are blocked while a (non-VM) thread is 923 // running Java. Only the VM thread handles these signals. 924 sigset_t* os::Solaris::vm_signals() { 925 assert(signal_sets_initialized, "Not initialized"); 926 return &vm_sigs; 927 } 928 929 // CR 7190089: on Solaris, primordial thread's stack needs adjusting. 930 // Without the adjustment, stack size is incorrect if stack is set to unlimited (ulimit -s unlimited). 931 void os::Solaris::correct_stack_boundaries_for_primordial_thread(Thread* thr) { 932 assert(is_primordial_thread(), "Call only for primordial thread"); 933 934 JavaThread* jt = (JavaThread *)thr; 935 assert(jt != NULL, "Sanity check"); 936 size_t stack_size; 937 address base = jt->stack_base(); 938 if (Arguments::created_by_java_launcher()) { 939 // Use 2MB to allow for Solaris 7 64 bit mode. 940 stack_size = JavaThread::stack_size_at_create() == 0 941 ? 2048*K : JavaThread::stack_size_at_create(); 942 943 // There are rare cases when we may have already used more than 944 // the basic stack size allotment before this method is invoked. 945 // Attempt to allow for a normally sized java_stack. 946 size_t current_stack_offset = (size_t)(base - (address)&stack_size); 947 stack_size += ReservedSpace::page_align_size_down(current_stack_offset); 948 } else { 949 // 6269555: If we were not created by a Java launcher, i.e. if we are 950 // running embedded in a native application, treat the primordial thread 951 // as much like a native attached thread as possible. This means using 952 // the current stack size from thr_stksegment(), unless it is too large 953 // to reliably setup guard pages. A reasonable max size is 8MB. 954 size_t current_size = os::current_stack_size(); 955 // This should never happen, but just in case.... 956 if (current_size == 0) current_size = 2 * K * K; 957 stack_size = current_size > (8 * K * K) ? (8 * K * K) : current_size; 958 } 959 address bottom = align_up(base - stack_size, os::vm_page_size());; 960 stack_size = (size_t)(base - bottom); 961 962 assert(stack_size > 0, "Stack size calculation problem"); 963 964 if (stack_size > jt->stack_size()) { 965 #ifndef PRODUCT 966 struct rlimit limits; 967 getrlimit(RLIMIT_STACK, &limits); 968 size_t size = adjust_stack_size(base, (size_t)limits.rlim_cur); 969 assert(size >= jt->stack_size(), "Stack size problem in main thread"); 970 #endif 971 tty->print_cr("Stack size of %d Kb exceeds current limit of %d Kb.\n" 972 "(Stack sizes are rounded up to a multiple of the system page size.)\n" 973 "See limit(1) to increase the stack size limit.", 974 stack_size / K, jt->stack_size() / K); 975 vm_exit(1); 976 } 977 assert(jt->stack_size() >= stack_size, 978 "Attempt to map more stack than was allocated"); 979 jt->set_stack_size(stack_size); 980 981 } 982 983 984 985 // Free Solaris resources related to the OSThread 986 void os::free_thread(OSThread* osthread) { 987 assert(osthread != NULL, "os::free_thread but osthread not set"); 988 989 // We are told to free resources of the argument thread, 990 // but we can only really operate on the current thread. 991 assert(Thread::current()->osthread() == osthread, 992 "os::free_thread but not current thread"); 993 994 // Restore caller's signal mask 995 sigset_t sigmask = osthread->caller_sigmask(); 996 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); 997 998 delete osthread; 999 } 1000 1001 void os::pd_start_thread(Thread* thread) { 1002 int status = thr_continue(thread->osthread()->thread_id()); 1003 assert_status(status == 0, status, "thr_continue failed"); 1004 } 1005 1006 1007 intx os::current_thread_id() { 1008 return (intx)thr_self(); 1009 } 1010 1011 static pid_t _initial_pid = 0; 1012 1013 int os::current_process_id() { 1014 return (int)(_initial_pid ? _initial_pid : getpid()); 1015 } 1016 1017 // gethrtime() should be monotonic according to the documentation, 1018 // but some virtualized platforms are known to break this guarantee. 1019 // getTimeNanos() must be guaranteed not to move backwards, so we 1020 // are forced to add a check here. 1021 inline hrtime_t getTimeNanos() { 1022 const hrtime_t now = gethrtime(); 1023 const hrtime_t prev = max_hrtime; 1024 if (now <= prev) { 1025 return prev; // same or retrograde time; 1026 } 1027 const hrtime_t obsv = Atomic::cmpxchg(now, &max_hrtime, prev); 1028 assert(obsv >= prev, "invariant"); // Monotonicity 1029 // If the CAS succeeded then we're done and return "now". 1030 // If the CAS failed and the observed value "obsv" is >= now then 1031 // we should return "obsv". If the CAS failed and now > obsv > prv then 1032 // some other thread raced this thread and installed a new value, in which case 1033 // we could either (a) retry the entire operation, (b) retry trying to install now 1034 // or (c) just return obsv. We use (c). No loop is required although in some cases 1035 // we might discard a higher "now" value in deference to a slightly lower but freshly 1036 // installed obsv value. That's entirely benign -- it admits no new orderings compared 1037 // to (a) or (b) -- and greatly reduces coherence traffic. 1038 // We might also condition (c) on the magnitude of the delta between obsv and now. 1039 // Avoiding excessive CAS operations to hot RW locations is critical. 1040 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate 1041 return (prev == obsv) ? now : obsv; 1042 } 1043 1044 // Time since start-up in seconds to a fine granularity. 1045 // Used by VMSelfDestructTimer and the MemProfiler. 1046 double os::elapsedTime() { 1047 return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz; 1048 } 1049 1050 jlong os::elapsed_counter() { 1051 return (jlong)(getTimeNanos() - first_hrtime); 1052 } 1053 1054 jlong os::elapsed_frequency() { 1055 return hrtime_hz; 1056 } 1057 1058 // Return the real, user, and system times in seconds from an 1059 // arbitrary fixed point in the past. 1060 bool os::getTimesSecs(double* process_real_time, 1061 double* process_user_time, 1062 double* process_system_time) { 1063 struct tms ticks; 1064 clock_t real_ticks = times(&ticks); 1065 1066 if (real_ticks == (clock_t) (-1)) { 1067 return false; 1068 } else { 1069 double ticks_per_second = (double) clock_tics_per_sec; 1070 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; 1071 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; 1072 // For consistency return the real time from getTimeNanos() 1073 // converted to seconds. 1074 *process_real_time = ((double) getTimeNanos()) / ((double) NANOUNITS); 1075 1076 return true; 1077 } 1078 } 1079 1080 bool os::supports_vtime() { return true; } 1081 1082 double os::elapsedVTime() { 1083 return (double)gethrvtime() / (double)hrtime_hz; 1084 } 1085 1086 // Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis 1087 jlong os::javaTimeMillis() { 1088 timeval t; 1089 if (gettimeofday(&t, NULL) == -1) { 1090 fatal("os::javaTimeMillis: gettimeofday (%s)", os::strerror(errno)); 1091 } 1092 return jlong(t.tv_sec) * 1000 + jlong(t.tv_usec) / 1000; 1093 } 1094 1095 // Must return seconds+nanos since Jan 1 1970. This must use the same 1096 // time source as javaTimeMillis and can't use get_nsec_fromepoch as 1097 // we need better than 1ms accuracy 1098 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) { 1099 timeval t; 1100 if (gettimeofday(&t, NULL) == -1) { 1101 fatal("os::javaTimeSystemUTC: gettimeofday (%s)", os::strerror(errno)); 1102 } 1103 seconds = jlong(t.tv_sec); 1104 nanos = jlong(t.tv_usec) * 1000; 1105 } 1106 1107 1108 jlong os::javaTimeNanos() { 1109 return (jlong)getTimeNanos(); 1110 } 1111 1112 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 1113 info_ptr->max_value = ALL_64_BITS; // gethrtime() uses all 64 bits 1114 info_ptr->may_skip_backward = false; // not subject to resetting or drifting 1115 info_ptr->may_skip_forward = false; // not subject to resetting or drifting 1116 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 1117 } 1118 1119 char * os::local_time_string(char *buf, size_t buflen) { 1120 struct tm t; 1121 time_t long_time; 1122 time(&long_time); 1123 localtime_r(&long_time, &t); 1124 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 1125 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, 1126 t.tm_hour, t.tm_min, t.tm_sec); 1127 return buf; 1128 } 1129 1130 // Note: os::shutdown() might be called very early during initialization, or 1131 // called from signal handler. Before adding something to os::shutdown(), make 1132 // sure it is async-safe and can handle partially initialized VM. 1133 void os::shutdown() { 1134 1135 // allow PerfMemory to attempt cleanup of any persistent resources 1136 perfMemory_exit(); 1137 1138 // needs to remove object in file system 1139 AttachListener::abort(); 1140 1141 // flush buffered output, finish log files 1142 ostream_abort(); 1143 1144 // Check for abort hook 1145 abort_hook_t abort_hook = Arguments::abort_hook(); 1146 if (abort_hook != NULL) { 1147 abort_hook(); 1148 } 1149 } 1150 1151 // Note: os::abort() might be called very early during initialization, or 1152 // called from signal handler. Before adding something to os::abort(), make 1153 // sure it is async-safe and can handle partially initialized VM. 1154 void os::abort(bool dump_core, void* siginfo, const void* context) { 1155 os::shutdown(); 1156 if (dump_core) { 1157 #ifndef PRODUCT 1158 fdStream out(defaultStream::output_fd()); 1159 out.print_raw("Current thread is "); 1160 char buf[16]; 1161 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); 1162 out.print_raw_cr(buf); 1163 out.print_raw_cr("Dumping core ..."); 1164 #endif 1165 ::abort(); // dump core (for debugging) 1166 } 1167 1168 ::exit(1); 1169 } 1170 1171 // Die immediately, no exit hook, no abort hook, no cleanup. 1172 // Dump a core file, if possible, for debugging. 1173 void os::die() { 1174 if (TestUnresponsiveErrorHandler && !CreateCoredumpOnCrash) { 1175 // For TimeoutInErrorHandlingTest.java, we just kill the VM 1176 // and don't take the time to generate a core file. 1177 os::signal_raise(SIGKILL); 1178 } else { 1179 ::abort(); 1180 } 1181 } 1182 1183 // DLL functions 1184 1185 const char* os::dll_file_extension() { return ".so"; } 1186 1187 // This must be hard coded because it's the system's temporary 1188 // directory not the java application's temp directory, ala java.io.tmpdir. 1189 const char* os::get_temp_directory() { return "/tmp"; } 1190 1191 // check if addr is inside libjvm.so 1192 bool os::address_is_in_vm(address addr) { 1193 static address libjvm_base_addr; 1194 Dl_info dlinfo; 1195 1196 if (libjvm_base_addr == NULL) { 1197 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) { 1198 libjvm_base_addr = (address)dlinfo.dli_fbase; 1199 } 1200 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); 1201 } 1202 1203 if (dladdr((void *)addr, &dlinfo) != 0) { 1204 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; 1205 } 1206 1207 return false; 1208 } 1209 1210 typedef int (*dladdr1_func_type)(void *, Dl_info *, void **, int); 1211 static dladdr1_func_type dladdr1_func = NULL; 1212 1213 bool os::dll_address_to_function_name(address addr, char *buf, 1214 int buflen, int * offset, 1215 bool demangle) { 1216 // buf is not optional, but offset is optional 1217 assert(buf != NULL, "sanity check"); 1218 1219 Dl_info dlinfo; 1220 1221 // dladdr1_func was initialized in os::init() 1222 if (dladdr1_func != NULL) { 1223 // yes, we have dladdr1 1224 1225 // Support for dladdr1 is checked at runtime; it may be 1226 // available even if the vm is built on a machine that does 1227 // not have dladdr1 support. Make sure there is a value for 1228 // RTLD_DL_SYMENT. 1229 #ifndef RTLD_DL_SYMENT 1230 #define RTLD_DL_SYMENT 1 1231 #endif 1232 #ifdef _LP64 1233 Elf64_Sym * info; 1234 #else 1235 Elf32_Sym * info; 1236 #endif 1237 if (dladdr1_func((void *)addr, &dlinfo, (void **)&info, 1238 RTLD_DL_SYMENT) != 0) { 1239 // see if we have a matching symbol that covers our address 1240 if (dlinfo.dli_saddr != NULL && 1241 (char *)dlinfo.dli_saddr + info->st_size > (char *)addr) { 1242 if (dlinfo.dli_sname != NULL) { 1243 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) { 1244 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); 1245 } 1246 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1247 return true; 1248 } 1249 } 1250 // no matching symbol so try for just file info 1251 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { 1252 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1253 buf, buflen, offset, dlinfo.dli_fname, demangle)) { 1254 return true; 1255 } 1256 } 1257 } 1258 buf[0] = '\0'; 1259 if (offset != NULL) *offset = -1; 1260 return false; 1261 } 1262 1263 // no, only dladdr is available 1264 if (dladdr((void *)addr, &dlinfo) != 0) { 1265 // see if we have a matching symbol 1266 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) { 1267 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) { 1268 jio_snprintf(buf, buflen, dlinfo.dli_sname); 1269 } 1270 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1271 return true; 1272 } 1273 // no matching symbol so try for just file info 1274 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { 1275 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1276 buf, buflen, offset, dlinfo.dli_fname, demangle)) { 1277 return true; 1278 } 1279 } 1280 } 1281 buf[0] = '\0'; 1282 if (offset != NULL) *offset = -1; 1283 return false; 1284 } 1285 1286 bool os::dll_address_to_library_name(address addr, char* buf, 1287 int buflen, int* offset) { 1288 // buf is not optional, but offset is optional 1289 assert(buf != NULL, "sanity check"); 1290 1291 Dl_info dlinfo; 1292 1293 if (dladdr((void*)addr, &dlinfo) != 0) { 1294 if (dlinfo.dli_fname != NULL) { 1295 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); 1296 } 1297 if (dlinfo.dli_fbase != NULL && offset != NULL) { 1298 *offset = addr - (address)dlinfo.dli_fbase; 1299 } 1300 return true; 1301 } 1302 1303 buf[0] = '\0'; 1304 if (offset) *offset = -1; 1305 return false; 1306 } 1307 1308 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) { 1309 Dl_info dli; 1310 // Sanity check? 1311 if (dladdr(CAST_FROM_FN_PTR(void *, os::get_loaded_modules_info), &dli) == 0 || 1312 dli.dli_fname == NULL) { 1313 return 1; 1314 } 1315 1316 void * handle = dlopen(dli.dli_fname, RTLD_LAZY); 1317 if (handle == NULL) { 1318 return 1; 1319 } 1320 1321 Link_map *map; 1322 dlinfo(handle, RTLD_DI_LINKMAP, &map); 1323 if (map == NULL) { 1324 dlclose(handle); 1325 return 1; 1326 } 1327 1328 while (map->l_prev != NULL) { 1329 map = map->l_prev; 1330 } 1331 1332 while (map != NULL) { 1333 // Iterate through all map entries and call callback with fields of interest 1334 if(callback(map->l_name, (address)map->l_addr, (address)0, param)) { 1335 dlclose(handle); 1336 return 1; 1337 } 1338 map = map->l_next; 1339 } 1340 1341 dlclose(handle); 1342 return 0; 1343 } 1344 1345 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) { 1346 outputStream * out = (outputStream *) param; 1347 out->print_cr(PTR_FORMAT " \t%s", base_address, name); 1348 return 0; 1349 } 1350 1351 void os::print_dll_info(outputStream * st) { 1352 st->print_cr("Dynamic libraries:"); st->flush(); 1353 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) { 1354 st->print_cr("Error: Cannot print dynamic libraries."); 1355 } 1356 } 1357 1358 static void change_endianness(Elf32_Half& val) { 1359 unsigned char *ptr = (unsigned char *)&val; 1360 unsigned char swp = ptr[0]; 1361 ptr[0] = ptr[1]; 1362 ptr[1] = swp; 1363 } 1364 1365 // Loads .dll/.so and 1366 // in case of error it checks if .dll/.so was built for the 1367 // same architecture as Hotspot is running on 1368 1369 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { 1370 log_info(os)("attempting shared library load of %s", filename); 1371 1372 void * result= ::dlopen(filename, RTLD_LAZY); 1373 if (result != NULL) { 1374 // Successful loading 1375 Events::log(NULL, "Loaded shared library %s", filename); 1376 log_info(os)("shared library load of %s was successful", filename); 1377 return result; 1378 } 1379 1380 Elf32_Ehdr elf_head; 1381 const char* error_report = ::dlerror(); 1382 if (error_report == NULL) { 1383 error_report = "dlerror returned no error description"; 1384 } 1385 if (ebuf != NULL && ebuflen > 0) { 1386 ::strncpy(ebuf, error_report, ebuflen-1); 1387 ebuf[ebuflen-1]='\0'; 1388 } 1389 1390 Events::log(NULL, "Loading shared library %s failed, %s", filename, error_report); 1391 log_info(os)("shared library load of %s failed, %s", filename, error_report); 1392 1393 int diag_msg_max_length=ebuflen-strlen(ebuf); 1394 char* diag_msg_buf=ebuf+strlen(ebuf); 1395 1396 if (diag_msg_max_length==0) { 1397 // No more space in ebuf for additional diagnostics message 1398 return NULL; 1399 } 1400 1401 1402 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); 1403 1404 if (file_descriptor < 0) { 1405 // Can't open library, report dlerror() message 1406 return NULL; 1407 } 1408 1409 bool failed_to_read_elf_head= 1410 (sizeof(elf_head)!= 1411 (::read(file_descriptor, &elf_head,sizeof(elf_head)))); 1412 1413 ::close(file_descriptor); 1414 if (failed_to_read_elf_head) { 1415 // file i/o error - report dlerror() msg 1416 return NULL; 1417 } 1418 1419 if (elf_head.e_ident[EI_DATA] != LITTLE_ENDIAN_ONLY(ELFDATA2LSB) BIG_ENDIAN_ONLY(ELFDATA2MSB)) { 1420 // handle invalid/out of range endianness values 1421 if (elf_head.e_ident[EI_DATA] == 0 || elf_head.e_ident[EI_DATA] > 2) { 1422 return NULL; 1423 } 1424 change_endianness(elf_head.e_machine); 1425 } 1426 1427 typedef struct { 1428 Elf32_Half code; // Actual value as defined in elf.h 1429 Elf32_Half compat_class; // Compatibility of archs at VM's sense 1430 unsigned char elf_class; // 32 or 64 bit 1431 unsigned char endianess; // MSB or LSB 1432 char* name; // String representation 1433 } arch_t; 1434 1435 #ifndef EM_AARCH64 1436 #define EM_AARCH64 183 /* ARM AARCH64 */ 1437 #endif 1438 1439 static const arch_t arch_array[]={ 1440 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1441 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1442 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, 1443 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, 1444 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1445 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1446 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, 1447 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, 1448 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, 1449 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM"}, 1450 // we only support 64 bit z architecture 1451 {EM_S390, EM_S390, ELFCLASS64, ELFDATA2MSB, (char*)"IBM System/390"}, 1452 {EM_AARCH64, EM_AARCH64, ELFCLASS64, ELFDATA2LSB, (char*)"AARCH64"} 1453 }; 1454 1455 #if (defined IA32) 1456 static Elf32_Half running_arch_code=EM_386; 1457 #elif (defined AMD64) 1458 static Elf32_Half running_arch_code=EM_X86_64; 1459 #elif (defined IA64) 1460 static Elf32_Half running_arch_code=EM_IA_64; 1461 #elif (defined __sparc) && (defined _LP64) 1462 static Elf32_Half running_arch_code=EM_SPARCV9; 1463 #elif (defined __sparc) && (!defined _LP64) 1464 static Elf32_Half running_arch_code=EM_SPARC; 1465 #elif (defined __powerpc64__) 1466 static Elf32_Half running_arch_code=EM_PPC64; 1467 #elif (defined __powerpc__) 1468 static Elf32_Half running_arch_code=EM_PPC; 1469 #elif (defined ARM) 1470 static Elf32_Half running_arch_code=EM_ARM; 1471 #else 1472 #error Method os::dll_load requires that one of following is defined:\ 1473 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, ARM 1474 #endif 1475 1476 // Identify compatibility class for VM's architecture and library's architecture 1477 // Obtain string descriptions for architectures 1478 1479 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; 1480 int running_arch_index=-1; 1481 1482 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) { 1483 if (running_arch_code == arch_array[i].code) { 1484 running_arch_index = i; 1485 } 1486 if (lib_arch.code == arch_array[i].code) { 1487 lib_arch.compat_class = arch_array[i].compat_class; 1488 lib_arch.name = arch_array[i].name; 1489 } 1490 } 1491 1492 assert(running_arch_index != -1, 1493 "Didn't find running architecture code (running_arch_code) in arch_array"); 1494 if (running_arch_index == -1) { 1495 // Even though running architecture detection failed 1496 // we may still continue with reporting dlerror() message 1497 return NULL; 1498 } 1499 1500 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { 1501 if (lib_arch.name != NULL) { 1502 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1503 " (Possible cause: can't load %s .so on a %s platform)", 1504 lib_arch.name, arch_array[running_arch_index].name); 1505 } else { 1506 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1507 " (Possible cause: can't load this .so (machine code=0x%x) on a %s platform)", 1508 lib_arch.code, arch_array[running_arch_index].name); 1509 } 1510 return NULL; 1511 } 1512 1513 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { 1514 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); 1515 return NULL; 1516 } 1517 1518 // ELF file class/capacity : 0 - invalid, 1 - 32bit, 2 - 64bit 1519 if (lib_arch.elf_class > 2 || lib_arch.elf_class < 1) { 1520 ::snprintf(diag_msg_buf, diag_msg_max_length-1, " (Possible cause: invalid ELF file class)"); 1521 return NULL; 1522 } 1523 1524 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { 1525 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1526 " (Possible cause: architecture word width mismatch, can't load %d-bit .so on a %d-bit platform)", 1527 (int) lib_arch.elf_class * 32, arch_array[running_arch_index].elf_class * 32); 1528 return NULL; 1529 } 1530 1531 return NULL; 1532 } 1533 1534 void* os::dll_lookup(void* handle, const char* name) { 1535 return dlsym(handle, name); 1536 } 1537 1538 void* os::get_default_process_handle() { 1539 return (void*)::dlopen(NULL, RTLD_LAZY); 1540 } 1541 1542 static inline time_t get_mtime(const char* filename) { 1543 struct stat st; 1544 int ret = os::stat(filename, &st); 1545 assert(ret == 0, "failed to stat() file '%s': %s", filename, os::strerror(errno)); 1546 return st.st_mtime; 1547 } 1548 1549 int os::compare_file_modified_times(const char* file1, const char* file2) { 1550 time_t t1 = get_mtime(file1); 1551 time_t t2 = get_mtime(file2); 1552 return t1 - t2; 1553 } 1554 1555 static bool _print_ascii_file(const char* filename, outputStream* st) { 1556 int fd = ::open(filename, O_RDONLY); 1557 if (fd == -1) { 1558 return false; 1559 } 1560 1561 char buf[32]; 1562 int bytes; 1563 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { 1564 st->print_raw(buf, bytes); 1565 } 1566 1567 ::close(fd); 1568 1569 return true; 1570 } 1571 1572 void os::print_os_info_brief(outputStream* st) { 1573 os::Solaris::print_distro_info(st); 1574 1575 os::Posix::print_uname_info(st); 1576 1577 os::Solaris::print_libversion_info(st); 1578 } 1579 1580 void os::print_os_info(outputStream* st) { 1581 st->print("OS:"); 1582 1583 os::Solaris::print_distro_info(st); 1584 1585 os::Posix::print_uname_info(st); 1586 1587 os::Posix::print_uptime_info(st); 1588 1589 os::Solaris::print_libversion_info(st); 1590 1591 os::Posix::print_rlimit_info(st); 1592 1593 os::Posix::print_load_average(st); 1594 } 1595 1596 void os::Solaris::print_distro_info(outputStream* st) { 1597 if (!_print_ascii_file("/etc/release", st)) { 1598 st->print("Solaris"); 1599 } 1600 st->cr(); 1601 } 1602 1603 void os::get_summary_os_info(char* buf, size_t buflen) { 1604 strncpy(buf, "Solaris", buflen); // default to plain solaris 1605 FILE* fp = fopen("/etc/release", "r"); 1606 if (fp != NULL) { 1607 char tmp[256]; 1608 // Only get the first line and chop out everything but the os name. 1609 if (fgets(tmp, sizeof(tmp), fp)) { 1610 char* ptr = tmp; 1611 // skip past whitespace characters 1612 while (*ptr != '\0' && (*ptr == ' ' || *ptr == '\t' || *ptr == '\n')) ptr++; 1613 if (*ptr != '\0') { 1614 char* nl = strchr(ptr, '\n'); 1615 if (nl != NULL) *nl = '\0'; 1616 strncpy(buf, ptr, buflen); 1617 } 1618 } 1619 fclose(fp); 1620 } 1621 } 1622 1623 void os::Solaris::print_libversion_info(outputStream* st) { 1624 st->print(" (T2 libthread)"); 1625 st->cr(); 1626 } 1627 1628 static bool check_addr0(outputStream* st) { 1629 jboolean status = false; 1630 const int read_chunk = 200; 1631 int ret = 0; 1632 int nmap = 0; 1633 int fd = ::open("/proc/self/map",O_RDONLY); 1634 if (fd >= 0) { 1635 prmap_t *p = NULL; 1636 char *mbuff = (char *) calloc(read_chunk, sizeof(prmap_t)); 1637 if (NULL == mbuff) { 1638 ::close(fd); 1639 return status; 1640 } 1641 while ((ret = ::read(fd, mbuff, read_chunk*sizeof(prmap_t))) > 0) { 1642 //check if read() has not read partial data 1643 if( 0 != ret % sizeof(prmap_t)){ 1644 break; 1645 } 1646 nmap = ret / sizeof(prmap_t); 1647 p = (prmap_t *)mbuff; 1648 for(int i = 0; i < nmap; i++){ 1649 if (p->pr_vaddr == 0x0) { 1650 st->print("Warning: Address: " PTR_FORMAT ", Size: " SIZE_FORMAT "K, ",p->pr_vaddr, p->pr_size/1024); 1651 st->print("Mapped file: %s, ", p->pr_mapname[0] == '\0' ? "None" : p->pr_mapname); 1652 st->print("Access: "); 1653 st->print("%s",(p->pr_mflags & MA_READ) ? "r" : "-"); 1654 st->print("%s",(p->pr_mflags & MA_WRITE) ? "w" : "-"); 1655 st->print("%s",(p->pr_mflags & MA_EXEC) ? "x" : "-"); 1656 st->cr(); 1657 status = true; 1658 } 1659 p++; 1660 } 1661 } 1662 free(mbuff); 1663 ::close(fd); 1664 } 1665 return status; 1666 } 1667 1668 void os::get_summary_cpu_info(char* buf, size_t buflen) { 1669 // Get MHz with system call. We don't seem to already have this. 1670 processor_info_t stats; 1671 processorid_t id = getcpuid(); 1672 int clock = 0; 1673 if (processor_info(id, &stats) != -1) { 1674 clock = stats.pi_clock; // pi_processor_type isn't more informative than below 1675 } 1676 #ifdef AMD64 1677 snprintf(buf, buflen, "x86 64 bit %d MHz", clock); 1678 #else 1679 // must be sparc 1680 snprintf(buf, buflen, "Sparcv9 64 bit %d MHz", clock); 1681 #endif 1682 } 1683 1684 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) { 1685 // Nothing to do for now. 1686 } 1687 1688 void os::print_memory_info(outputStream* st) { 1689 st->print("Memory:"); 1690 st->print(" %dk page", os::vm_page_size()>>10); 1691 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10); 1692 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10); 1693 st->cr(); 1694 (void) check_addr0(st); 1695 } 1696 1697 // Moved from whole group, because we need them here for diagnostic 1698 // prints. 1699 static int Maxsignum = 0; 1700 static int *ourSigFlags = NULL; 1701 1702 int os::Solaris::get_our_sigflags(int sig) { 1703 assert(ourSigFlags!=NULL, "signal data structure not initialized"); 1704 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range"); 1705 return ourSigFlags[sig]; 1706 } 1707 1708 void os::Solaris::set_our_sigflags(int sig, int flags) { 1709 assert(ourSigFlags!=NULL, "signal data structure not initialized"); 1710 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range"); 1711 ourSigFlags[sig] = flags; 1712 } 1713 1714 1715 static const char* get_signal_handler_name(address handler, 1716 char* buf, int buflen) { 1717 int offset; 1718 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 1719 if (found) { 1720 // skip directory names 1721 const char *p1, *p2; 1722 p1 = buf; 1723 size_t len = strlen(os::file_separator()); 1724 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 1725 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); 1726 } else { 1727 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 1728 } 1729 return buf; 1730 } 1731 1732 static void print_signal_handler(outputStream* st, int sig, 1733 char* buf, size_t buflen) { 1734 struct sigaction sa; 1735 1736 sigaction(sig, NULL, &sa); 1737 1738 st->print("%s: ", os::exception_name(sig, buf, buflen)); 1739 1740 address handler = (sa.sa_flags & SA_SIGINFO) 1741 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 1742 : CAST_FROM_FN_PTR(address, sa.sa_handler); 1743 1744 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 1745 st->print("SIG_DFL"); 1746 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 1747 st->print("SIG_IGN"); 1748 } else { 1749 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 1750 } 1751 1752 st->print(", sa_mask[0]="); 1753 os::Posix::print_signal_set_short(st, &sa.sa_mask); 1754 1755 address rh = VMError::get_resetted_sighandler(sig); 1756 // May be, handler was resetted by VMError? 1757 if (rh != NULL) { 1758 handler = rh; 1759 sa.sa_flags = VMError::get_resetted_sigflags(sig); 1760 } 1761 1762 st->print(", sa_flags="); 1763 os::Posix::print_sa_flags(st, sa.sa_flags); 1764 1765 // Check: is it our handler? 1766 if (handler == CAST_FROM_FN_PTR(address, signalHandler)) { 1767 // It is our signal handler 1768 // check for flags 1769 if (sa.sa_flags != os::Solaris::get_our_sigflags(sig)) { 1770 st->print( 1771 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", 1772 os::Solaris::get_our_sigflags(sig)); 1773 } 1774 } 1775 st->cr(); 1776 } 1777 1778 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1779 st->print_cr("Signal Handlers:"); 1780 print_signal_handler(st, SIGSEGV, buf, buflen); 1781 print_signal_handler(st, SIGBUS , buf, buflen); 1782 print_signal_handler(st, SIGFPE , buf, buflen); 1783 print_signal_handler(st, SIGPIPE, buf, buflen); 1784 print_signal_handler(st, SIGXFSZ, buf, buflen); 1785 print_signal_handler(st, SIGILL , buf, buflen); 1786 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen); 1787 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); 1788 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen); 1789 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); 1790 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen); 1791 } 1792 1793 static char saved_jvm_path[MAXPATHLEN] = { 0 }; 1794 1795 // Find the full path to the current module, libjvm.so 1796 void os::jvm_path(char *buf, jint buflen) { 1797 // Error checking. 1798 if (buflen < MAXPATHLEN) { 1799 assert(false, "must use a large-enough buffer"); 1800 buf[0] = '\0'; 1801 return; 1802 } 1803 // Lazy resolve the path to current module. 1804 if (saved_jvm_path[0] != 0) { 1805 strcpy(buf, saved_jvm_path); 1806 return; 1807 } 1808 1809 Dl_info dlinfo; 1810 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo); 1811 assert(ret != 0, "cannot locate libjvm"); 1812 if (ret != 0 && dlinfo.dli_fname != NULL) { 1813 if (os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen) == NULL) { 1814 return; 1815 } 1816 } else { 1817 buf[0] = '\0'; 1818 return; 1819 } 1820 1821 if (Arguments::sun_java_launcher_is_altjvm()) { 1822 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical 1823 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so". 1824 // If "/jre/lib/" appears at the right place in the string, then 1825 // assume we are installed in a JDK and we're done. Otherwise, check 1826 // for a JAVA_HOME environment variable and fix up the path so it 1827 // looks like libjvm.so is installed there (append a fake suffix 1828 // hotspot/libjvm.so). 1829 const char *p = buf + strlen(buf) - 1; 1830 for (int count = 0; p > buf && count < 5; ++count) { 1831 for (--p; p > buf && *p != '/'; --p) 1832 /* empty */ ; 1833 } 1834 1835 if (strncmp(p, "/jre/lib/", 9) != 0) { 1836 // Look for JAVA_HOME in the environment. 1837 char* java_home_var = ::getenv("JAVA_HOME"); 1838 if (java_home_var != NULL && java_home_var[0] != 0) { 1839 char* jrelib_p; 1840 int len; 1841 1842 // Check the current module name "libjvm.so". 1843 p = strrchr(buf, '/'); 1844 assert(strstr(p, "/libjvm") == p, "invalid library name"); 1845 1846 if (os::Posix::realpath(java_home_var, buf, buflen) == NULL) { 1847 return; 1848 } 1849 // determine if this is a legacy image or modules image 1850 // modules image doesn't have "jre" subdirectory 1851 len = strlen(buf); 1852 assert(len < buflen, "Ran out of buffer space"); 1853 jrelib_p = buf + len; 1854 snprintf(jrelib_p, buflen-len, "/jre/lib"); 1855 if (0 != access(buf, F_OK)) { 1856 snprintf(jrelib_p, buflen-len, "/lib"); 1857 } 1858 1859 if (0 == access(buf, F_OK)) { 1860 // Use current module name "libjvm.so" 1861 len = strlen(buf); 1862 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so"); 1863 } else { 1864 // Go back to path of .so 1865 if (os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen) == NULL) { 1866 return; 1867 } 1868 } 1869 } 1870 } 1871 } 1872 1873 strncpy(saved_jvm_path, buf, MAXPATHLEN); 1874 saved_jvm_path[MAXPATHLEN - 1] = '\0'; 1875 } 1876 1877 1878 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1879 // no prefix required, not even "_" 1880 } 1881 1882 1883 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1884 // no suffix required 1885 } 1886 1887 // sun.misc.Signal 1888 1889 extern "C" { 1890 static void UserHandler(int sig, void *siginfo, void *context) { 1891 // Ctrl-C is pressed during error reporting, likely because the error 1892 // handler fails to abort. Let VM die immediately. 1893 if (sig == SIGINT && VMError::is_error_reported()) { 1894 os::die(); 1895 } 1896 1897 os::signal_notify(sig); 1898 // We do not need to reinstate the signal handler each time... 1899 } 1900 } 1901 1902 void* os::user_handler() { 1903 return CAST_FROM_FN_PTR(void*, UserHandler); 1904 } 1905 1906 extern "C" { 1907 typedef void (*sa_handler_t)(int); 1908 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); 1909 } 1910 1911 void* os::signal(int signal_number, void* handler) { 1912 struct sigaction sigAct, oldSigAct; 1913 sigfillset(&(sigAct.sa_mask)); 1914 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND; 1915 sigAct.sa_flags |= SA_SIGINFO; 1916 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); 1917 1918 if (sigaction(signal_number, &sigAct, &oldSigAct)) { 1919 // -1 means registration failed 1920 return (void *)-1; 1921 } 1922 1923 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); 1924 } 1925 1926 void os::signal_raise(int signal_number) { 1927 raise(signal_number); 1928 } 1929 1930 // The following code is moved from os.cpp for making this 1931 // code platform specific, which it is by its very nature. 1932 1933 // a counter for each possible signal value 1934 static int Sigexit = 0; 1935 static jint *pending_signals = NULL; 1936 static int *preinstalled_sigs = NULL; 1937 static struct sigaction *chainedsigactions = NULL; 1938 static Semaphore* sig_sem = NULL; 1939 1940 int os::sigexitnum_pd() { 1941 assert(Sigexit > 0, "signal memory not yet initialized"); 1942 return Sigexit; 1943 } 1944 1945 void os::Solaris::init_signal_mem() { 1946 // Initialize signal structures 1947 Maxsignum = SIGRTMAX; 1948 Sigexit = Maxsignum+1; 1949 assert(Maxsignum >0, "Unable to obtain max signal number"); 1950 1951 // Initialize signal structures 1952 // pending_signals has one int per signal 1953 // The additional signal is for SIGEXIT - exit signal to signal_thread 1954 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal); 1955 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1))); 1956 1957 if (UseSignalChaining) { 1958 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction) 1959 * (Maxsignum + 1), mtInternal); 1960 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1))); 1961 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1), mtInternal); 1962 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1))); 1963 } 1964 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1), mtInternal); 1965 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1)); 1966 } 1967 1968 static void jdk_misc_signal_init() { 1969 // Initialize signal semaphore 1970 sig_sem = new Semaphore(); 1971 } 1972 1973 void os::signal_notify(int sig) { 1974 if (sig_sem != NULL) { 1975 Atomic::inc(&pending_signals[sig]); 1976 sig_sem->signal(); 1977 } else { 1978 // Signal thread is not created with ReduceSignalUsage and jdk_misc_signal_init 1979 // initialization isn't called. 1980 assert(ReduceSignalUsage, "signal semaphore should be created"); 1981 } 1982 } 1983 1984 static int check_pending_signals() { 1985 int ret; 1986 while (true) { 1987 for (int i = 0; i < Sigexit + 1; i++) { 1988 jint n = pending_signals[i]; 1989 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 1990 return i; 1991 } 1992 } 1993 JavaThread *thread = JavaThread::current(); 1994 ThreadBlockInVM tbivm(thread); 1995 1996 bool threadIsSuspended; 1997 do { 1998 thread->set_suspend_equivalent(); 1999 sig_sem->wait(); 2000 2001 // were we externally suspended while we were waiting? 2002 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2003 if (threadIsSuspended) { 2004 // The semaphore has been incremented, but while we were waiting 2005 // another thread suspended us. We don't want to continue running 2006 // while suspended because that would surprise the thread that 2007 // suspended us. 2008 sig_sem->signal(); 2009 2010 thread->java_suspend_self(); 2011 } 2012 } while (threadIsSuspended); 2013 } 2014 } 2015 2016 int os::signal_wait() { 2017 return check_pending_signals(); 2018 } 2019 2020 //////////////////////////////////////////////////////////////////////////////// 2021 // Virtual Memory 2022 2023 static int page_size = -1; 2024 2025 int os::vm_page_size() { 2026 assert(page_size != -1, "must call os::init"); 2027 return page_size; 2028 } 2029 2030 // Solaris allocates memory by pages. 2031 int os::vm_allocation_granularity() { 2032 assert(page_size != -1, "must call os::init"); 2033 return page_size; 2034 } 2035 2036 static bool recoverable_mmap_error(int err) { 2037 // See if the error is one we can let the caller handle. This 2038 // list of errno values comes from the Solaris mmap(2) man page. 2039 switch (err) { 2040 case EBADF: 2041 case EINVAL: 2042 case ENOTSUP: 2043 // let the caller deal with these errors 2044 return true; 2045 2046 default: 2047 // Any remaining errors on this OS can cause our reserved mapping 2048 // to be lost. That can cause confusion where different data 2049 // structures think they have the same memory mapped. The worst 2050 // scenario is if both the VM and a library think they have the 2051 // same memory mapped. 2052 return false; 2053 } 2054 } 2055 2056 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec, 2057 int err) { 2058 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 2059 ", %d) failed; error='%s' (errno=%d)", addr, bytes, exec, 2060 os::strerror(err), err); 2061 } 2062 2063 static void warn_fail_commit_memory(char* addr, size_t bytes, 2064 size_t alignment_hint, bool exec, 2065 int err) { 2066 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 2067 ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, bytes, 2068 alignment_hint, exec, os::strerror(err), err); 2069 } 2070 2071 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, bool exec) { 2072 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; 2073 size_t size = bytes; 2074 char *res = Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot); 2075 if (res != NULL) { 2076 if (UseNUMAInterleaving) { 2077 numa_make_global(addr, bytes); 2078 } 2079 return 0; 2080 } 2081 2082 int err = errno; // save errno from mmap() call in mmap_chunk() 2083 2084 if (!recoverable_mmap_error(err)) { 2085 warn_fail_commit_memory(addr, bytes, exec, err); 2086 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "committing reserved memory."); 2087 } 2088 2089 return err; 2090 } 2091 2092 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) { 2093 return Solaris::commit_memory_impl(addr, bytes, exec) == 0; 2094 } 2095 2096 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, bool exec, 2097 const char* mesg) { 2098 assert(mesg != NULL, "mesg must be specified"); 2099 int err = os::Solaris::commit_memory_impl(addr, bytes, exec); 2100 if (err != 0) { 2101 // the caller wants all commit errors to exit with the specified mesg: 2102 warn_fail_commit_memory(addr, bytes, exec, err); 2103 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg); 2104 } 2105 } 2106 2107 size_t os::Solaris::page_size_for_alignment(size_t alignment) { 2108 assert(is_aligned(alignment, (size_t) vm_page_size()), 2109 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, 2110 alignment, (size_t) vm_page_size()); 2111 2112 for (int i = 0; _page_sizes[i] != 0; i++) { 2113 if (is_aligned(alignment, _page_sizes[i])) { 2114 return _page_sizes[i]; 2115 } 2116 } 2117 2118 return (size_t) vm_page_size(); 2119 } 2120 2121 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, 2122 size_t alignment_hint, bool exec) { 2123 int err = Solaris::commit_memory_impl(addr, bytes, exec); 2124 if (err == 0 && UseLargePages && alignment_hint > 0) { 2125 assert(is_aligned(bytes, alignment_hint), 2126 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, alignment_hint); 2127 2128 // The syscall memcntl requires an exact page size (see man memcntl for details). 2129 size_t page_size = page_size_for_alignment(alignment_hint); 2130 if (page_size > (size_t) vm_page_size()) { 2131 (void)Solaris::setup_large_pages(addr, bytes, page_size); 2132 } 2133 } 2134 return err; 2135 } 2136 2137 bool os::pd_commit_memory(char* addr, size_t bytes, size_t alignment_hint, 2138 bool exec) { 2139 return Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec) == 0; 2140 } 2141 2142 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, 2143 size_t alignment_hint, bool exec, 2144 const char* mesg) { 2145 assert(mesg != NULL, "mesg must be specified"); 2146 int err = os::Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec); 2147 if (err != 0) { 2148 // the caller wants all commit errors to exit with the specified mesg: 2149 warn_fail_commit_memory(addr, bytes, alignment_hint, exec, err); 2150 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg); 2151 } 2152 } 2153 2154 // Uncommit the pages in a specified region. 2155 void os::pd_free_memory(char* addr, size_t bytes, size_t alignment_hint) { 2156 if (madvise(addr, bytes, MADV_FREE) < 0) { 2157 debug_only(warning("MADV_FREE failed.")); 2158 return; 2159 } 2160 } 2161 2162 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 2163 return os::commit_memory(addr, size, !ExecMem); 2164 } 2165 2166 bool os::remove_stack_guard_pages(char* addr, size_t size) { 2167 return os::uncommit_memory(addr, size); 2168 } 2169 2170 // Change the page size in a given range. 2171 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 2172 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned."); 2173 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned."); 2174 if (UseLargePages) { 2175 size_t page_size = Solaris::page_size_for_alignment(alignment_hint); 2176 if (page_size > (size_t) vm_page_size()) { 2177 Solaris::setup_large_pages(addr, bytes, page_size); 2178 } 2179 } 2180 } 2181 2182 // Tell the OS to make the range local to the first-touching LWP 2183 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { 2184 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned."); 2185 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) { 2186 debug_only(warning("MADV_ACCESS_LWP failed.")); 2187 } 2188 } 2189 2190 // Tell the OS that this range would be accessed from different LWPs. 2191 void os::numa_make_global(char *addr, size_t bytes) { 2192 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned."); 2193 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) { 2194 debug_only(warning("MADV_ACCESS_MANY failed.")); 2195 } 2196 } 2197 2198 // Get the number of the locality groups. 2199 size_t os::numa_get_groups_num() { 2200 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie()); 2201 return n != -1 ? n : 1; 2202 } 2203 2204 // Get a list of leaf locality groups. A leaf lgroup is group that 2205 // doesn't have any children. Typical leaf group is a CPU or a CPU/memory 2206 // board. An LWP is assigned to one of these groups upon creation. 2207 size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2208 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) { 2209 ids[0] = 0; 2210 return 1; 2211 } 2212 int result_size = 0, top = 1, bottom = 0, cur = 0; 2213 for (int k = 0; k < size; k++) { 2214 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur], 2215 (Solaris::lgrp_id_t*)&ids[top], size - top); 2216 if (r == -1) { 2217 ids[0] = 0; 2218 return 1; 2219 } 2220 if (!r) { 2221 // That's a leaf node. 2222 assert(bottom <= cur, "Sanity check"); 2223 // Check if the node has memory 2224 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur], 2225 NULL, 0, LGRP_RSRC_MEM) > 0) { 2226 ids[bottom++] = ids[cur]; 2227 } 2228 } 2229 top += r; 2230 cur++; 2231 } 2232 if (bottom == 0) { 2233 // Handle a situation, when the OS reports no memory available. 2234 // Assume UMA architecture. 2235 ids[0] = 0; 2236 return 1; 2237 } 2238 return bottom; 2239 } 2240 2241 // Detect the topology change. Typically happens during CPU plugging-unplugging. 2242 bool os::numa_topology_changed() { 2243 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie()); 2244 if (is_stale != -1 && is_stale) { 2245 Solaris::lgrp_fini(Solaris::lgrp_cookie()); 2246 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER); 2247 assert(c != 0, "Failure to initialize LGRP API"); 2248 Solaris::set_lgrp_cookie(c); 2249 return true; 2250 } 2251 return false; 2252 } 2253 2254 // Get the group id of the current LWP. 2255 int os::numa_get_group_id() { 2256 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID); 2257 if (lgrp_id == -1) { 2258 return 0; 2259 } 2260 const int size = os::numa_get_groups_num(); 2261 int *ids = (int*)alloca(size * sizeof(int)); 2262 2263 // Get the ids of all lgroups with memory; r is the count. 2264 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id, 2265 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM); 2266 if (r <= 0) { 2267 return 0; 2268 } 2269 return ids[os::random() % r]; 2270 } 2271 2272 int os::numa_get_group_id_for_address(const void* address) { 2273 return 0; 2274 } 2275 2276 // Request information about the page. 2277 bool os::get_page_info(char *start, page_info* info) { 2278 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE }; 2279 uint64_t addr = (uintptr_t)start; 2280 uint64_t outdata[2]; 2281 uint_t validity = 0; 2282 2283 if (meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) { 2284 return false; 2285 } 2286 2287 info->size = 0; 2288 info->lgrp_id = -1; 2289 2290 if ((validity & 1) != 0) { 2291 if ((validity & 2) != 0) { 2292 info->lgrp_id = outdata[0]; 2293 } 2294 if ((validity & 4) != 0) { 2295 info->size = outdata[1]; 2296 } 2297 return true; 2298 } 2299 return false; 2300 } 2301 2302 // Scan the pages from start to end until a page different than 2303 // the one described in the info parameter is encountered. 2304 char *os::scan_pages(char *start, char* end, page_info* page_expected, 2305 page_info* page_found) { 2306 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE }; 2307 const size_t types = sizeof(info_types) / sizeof(info_types[0]); 2308 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT + 1]; 2309 uint_t validity[MAX_MEMINFO_CNT]; 2310 2311 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size); 2312 uint64_t p = (uint64_t)start; 2313 while (p < (uint64_t)end) { 2314 addrs[0] = p; 2315 size_t addrs_count = 1; 2316 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] + page_size < (uint64_t)end) { 2317 addrs[addrs_count] = addrs[addrs_count - 1] + page_size; 2318 addrs_count++; 2319 } 2320 2321 if (meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) { 2322 return NULL; 2323 } 2324 2325 size_t i = 0; 2326 for (; i < addrs_count; i++) { 2327 if ((validity[i] & 1) != 0) { 2328 if ((validity[i] & 4) != 0) { 2329 if (outdata[types * i + 1] != page_expected->size) { 2330 break; 2331 } 2332 } else if (page_expected->size != 0) { 2333 break; 2334 } 2335 2336 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) { 2337 if (outdata[types * i] != page_expected->lgrp_id) { 2338 break; 2339 } 2340 } 2341 } else { 2342 return NULL; 2343 } 2344 } 2345 2346 if (i < addrs_count) { 2347 if ((validity[i] & 2) != 0) { 2348 page_found->lgrp_id = outdata[types * i]; 2349 } else { 2350 page_found->lgrp_id = -1; 2351 } 2352 if ((validity[i] & 4) != 0) { 2353 page_found->size = outdata[types * i + 1]; 2354 } else { 2355 page_found->size = 0; 2356 } 2357 return (char*)addrs[i]; 2358 } 2359 2360 p = addrs[addrs_count - 1] + page_size; 2361 } 2362 return end; 2363 } 2364 2365 bool os::pd_uncommit_memory(char* addr, size_t bytes) { 2366 size_t size = bytes; 2367 // Map uncommitted pages PROT_NONE so we fail early if we touch an 2368 // uncommitted page. Otherwise, the read/write might succeed if we 2369 // have enough swap space to back the physical page. 2370 return 2371 NULL != Solaris::mmap_chunk(addr, size, 2372 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, 2373 PROT_NONE); 2374 } 2375 2376 char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) { 2377 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0); 2378 2379 if (b == MAP_FAILED) { 2380 return NULL; 2381 } 2382 return b; 2383 } 2384 2385 char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes, 2386 size_t alignment_hint, bool fixed) { 2387 char* addr = requested_addr; 2388 int flags = MAP_PRIVATE | MAP_NORESERVE; 2389 2390 assert(!(fixed && (alignment_hint > 0)), 2391 "alignment hint meaningless with fixed mmap"); 2392 2393 if (fixed) { 2394 flags |= MAP_FIXED; 2395 } else if (alignment_hint > (size_t) vm_page_size()) { 2396 flags |= MAP_ALIGN; 2397 addr = (char*) alignment_hint; 2398 } 2399 2400 // Map uncommitted pages PROT_NONE so we fail early if we touch an 2401 // uncommitted page. Otherwise, the read/write might succeed if we 2402 // have enough swap space to back the physical page. 2403 return mmap_chunk(addr, bytes, flags, PROT_NONE); 2404 } 2405 2406 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, 2407 size_t alignment_hint) { 2408 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint, 2409 (requested_addr != NULL)); 2410 2411 guarantee(requested_addr == NULL || requested_addr == addr, 2412 "OS failed to return requested mmap address."); 2413 return addr; 2414 } 2415 2416 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) { 2417 assert(file_desc >= 0, "file_desc is not valid"); 2418 char* result = pd_attempt_reserve_memory_at(bytes, requested_addr); 2419 if (result != NULL) { 2420 if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) { 2421 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory")); 2422 } 2423 } 2424 return result; 2425 } 2426 2427 // Reserve memory at an arbitrary address, only if that area is 2428 // available (and not reserved for something else). 2429 2430 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2431 // Assert only that the size is a multiple of the page size, since 2432 // that's all that mmap requires, and since that's all we really know 2433 // about at this low abstraction level. If we need higher alignment, 2434 // we can either pass an alignment to this method or verify alignment 2435 // in one of the methods further up the call chain. See bug 5044738. 2436 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); 2437 2438 // Since snv_84, Solaris attempts to honor the address hint - see 5003415. 2439 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false); 2440 2441 volatile int err = errno; 2442 if (addr == requested_addr) { 2443 return addr; 2444 } 2445 2446 if (addr != NULL) { 2447 pd_unmap_memory(addr, bytes); 2448 } 2449 2450 return NULL; 2451 } 2452 2453 bool os::pd_release_memory(char* addr, size_t bytes) { 2454 size_t size = bytes; 2455 return munmap(addr, size) == 0; 2456 } 2457 2458 static bool solaris_mprotect(char* addr, size_t bytes, int prot) { 2459 assert(addr == (char*)align_down((uintptr_t)addr, os::vm_page_size()), 2460 "addr must be page aligned"); 2461 Events::log(NULL, "Protecting memory [" INTPTR_FORMAT "," INTPTR_FORMAT "] with protection modes %x", p2i(addr), p2i(addr+bytes), prot); 2462 int retVal = mprotect(addr, bytes, prot); 2463 return retVal == 0; 2464 } 2465 2466 // Protect memory (Used to pass readonly pages through 2467 // JNI GetArray<type>Elements with empty arrays.) 2468 // Also, used for serialization page and for compressed oops null pointer 2469 // checking. 2470 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 2471 bool is_committed) { 2472 unsigned int p = 0; 2473 switch (prot) { 2474 case MEM_PROT_NONE: p = PROT_NONE; break; 2475 case MEM_PROT_READ: p = PROT_READ; break; 2476 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; 2477 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; 2478 default: 2479 ShouldNotReachHere(); 2480 } 2481 // is_committed is unused. 2482 return solaris_mprotect(addr, bytes, p); 2483 } 2484 2485 // guard_memory and unguard_memory only happens within stack guard pages. 2486 // Since ISM pertains only to the heap, guard and unguard memory should not 2487 /// happen with an ISM region. 2488 bool os::guard_memory(char* addr, size_t bytes) { 2489 return solaris_mprotect(addr, bytes, PROT_NONE); 2490 } 2491 2492 bool os::unguard_memory(char* addr, size_t bytes) { 2493 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE); 2494 } 2495 2496 // Large page support 2497 static size_t _large_page_size = 0; 2498 2499 // Insertion sort for small arrays (descending order). 2500 static void insertion_sort_descending(size_t* array, int len) { 2501 for (int i = 0; i < len; i++) { 2502 size_t val = array[i]; 2503 for (size_t key = i; key > 0 && array[key - 1] < val; --key) { 2504 size_t tmp = array[key]; 2505 array[key] = array[key - 1]; 2506 array[key - 1] = tmp; 2507 } 2508 } 2509 } 2510 2511 bool os::Solaris::mpss_sanity_check(bool warn, size_t* page_size) { 2512 const unsigned int usable_count = VM_Version::page_size_count(); 2513 if (usable_count == 1) { 2514 return false; 2515 } 2516 2517 // Find the right getpagesizes interface. When solaris 11 is the minimum 2518 // build platform, getpagesizes() (without the '2') can be called directly. 2519 typedef int (*gps_t)(size_t[], int); 2520 gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2")); 2521 if (gps_func == NULL) { 2522 gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes")); 2523 if (gps_func == NULL) { 2524 if (warn) { 2525 warning("MPSS is not supported by the operating system."); 2526 } 2527 return false; 2528 } 2529 } 2530 2531 // Fill the array of page sizes. 2532 int n = (*gps_func)(_page_sizes, page_sizes_max); 2533 assert(n > 0, "Solaris bug?"); 2534 2535 if (n == page_sizes_max) { 2536 // Add a sentinel value (necessary only if the array was completely filled 2537 // since it is static (zeroed at initialization)). 2538 _page_sizes[--n] = 0; 2539 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");) 2540 } 2541 assert(_page_sizes[n] == 0, "missing sentinel"); 2542 trace_page_sizes("available page sizes", _page_sizes, n); 2543 2544 if (n == 1) return false; // Only one page size available. 2545 2546 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and 2547 // select up to usable_count elements. First sort the array, find the first 2548 // acceptable value, then copy the usable sizes to the top of the array and 2549 // trim the rest. Make sure to include the default page size :-). 2550 // 2551 // A better policy could get rid of the 4M limit by taking the sizes of the 2552 // important VM memory regions (java heap and possibly the code cache) into 2553 // account. 2554 insertion_sort_descending(_page_sizes, n); 2555 const size_t size_limit = 2556 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes; 2557 int beg; 2558 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */; 2559 const int end = MIN2((int)usable_count, n) - 1; 2560 for (int cur = 0; cur < end; ++cur, ++beg) { 2561 _page_sizes[cur] = _page_sizes[beg]; 2562 } 2563 _page_sizes[end] = vm_page_size(); 2564 _page_sizes[end + 1] = 0; 2565 2566 if (_page_sizes[end] > _page_sizes[end - 1]) { 2567 // Default page size is not the smallest; sort again. 2568 insertion_sort_descending(_page_sizes, end + 1); 2569 } 2570 *page_size = _page_sizes[0]; 2571 2572 trace_page_sizes("usable page sizes", _page_sizes, end + 1); 2573 return true; 2574 } 2575 2576 void os::large_page_init() { 2577 if (UseLargePages) { 2578 // print a warning if any large page related flag is specified on command line 2579 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || 2580 !FLAG_IS_DEFAULT(LargePageSizeInBytes); 2581 2582 UseLargePages = Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size); 2583 } 2584 } 2585 2586 bool os::Solaris::is_valid_page_size(size_t bytes) { 2587 for (int i = 0; _page_sizes[i] != 0; i++) { 2588 if (_page_sizes[i] == bytes) { 2589 return true; 2590 } 2591 } 2592 return false; 2593 } 2594 2595 bool os::Solaris::setup_large_pages(caddr_t start, size_t bytes, size_t align) { 2596 assert(is_valid_page_size(align), SIZE_FORMAT " is not a valid page size", align); 2597 assert(is_aligned((void*) start, align), 2598 PTR_FORMAT " is not aligned to " SIZE_FORMAT, p2i((void*) start), align); 2599 assert(is_aligned(bytes, align), 2600 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, align); 2601 2602 // Signal to OS that we want large pages for addresses 2603 // from addr, addr + bytes 2604 struct memcntl_mha mpss_struct; 2605 mpss_struct.mha_cmd = MHA_MAPSIZE_VA; 2606 mpss_struct.mha_pagesize = align; 2607 mpss_struct.mha_flags = 0; 2608 // Upon successful completion, memcntl() returns 0 2609 if (memcntl(start, bytes, MC_HAT_ADVISE, (caddr_t) &mpss_struct, 0, 0)) { 2610 debug_only(warning("Attempt to use MPSS failed.")); 2611 return false; 2612 } 2613 return true; 2614 } 2615 2616 char* os::reserve_memory_special(size_t size, size_t alignment, char* addr, bool exec) { 2617 fatal("os::reserve_memory_special should not be called on Solaris."); 2618 return NULL; 2619 } 2620 2621 bool os::release_memory_special(char* base, size_t bytes) { 2622 fatal("os::release_memory_special should not be called on Solaris."); 2623 return false; 2624 } 2625 2626 size_t os::large_page_size() { 2627 return _large_page_size; 2628 } 2629 2630 // MPSS allows application to commit large page memory on demand; with ISM 2631 // the entire memory region must be allocated as shared memory. 2632 bool os::can_commit_large_page_memory() { 2633 return true; 2634 } 2635 2636 bool os::can_execute_large_page_memory() { 2637 return true; 2638 } 2639 2640 // Sleep forever; naked call to OS-specific sleep; use with CAUTION 2641 void os::infinite_sleep() { 2642 while (true) { // sleep forever ... 2643 ::sleep(100); // ... 100 seconds at a time 2644 } 2645 } 2646 2647 // Used to convert frequent JVM_Yield() to nops 2648 bool os::dont_yield() { 2649 if (DontYieldALot) { 2650 static hrtime_t last_time = 0; 2651 hrtime_t diff = getTimeNanos() - last_time; 2652 2653 if (diff < DontYieldALotInterval * 1000000) { 2654 return true; 2655 } 2656 2657 last_time += diff; 2658 2659 return false; 2660 } else { 2661 return false; 2662 } 2663 } 2664 2665 // Note that yield semantics are defined by the scheduling class to which 2666 // the thread currently belongs. Typically, yield will _not yield to 2667 // other equal or higher priority threads that reside on the dispatch queues 2668 // of other CPUs. 2669 2670 void os::naked_yield() { 2671 thr_yield(); 2672 } 2673 2674 // Interface for setting lwp priorities. We are using T2 libthread, 2675 // which forces the use of bound threads, so all of our threads will 2676 // be assigned to real lwp's. Using the thr_setprio function is 2677 // meaningless in this mode so we must adjust the real lwp's priority. 2678 // The routines below implement the getting and setting of lwp priorities. 2679 // 2680 // Note: There are three priority scales used on Solaris. Java priotities 2681 // which range from 1 to 10, libthread "thr_setprio" scale which range 2682 // from 0 to 127, and the current scheduling class of the process we 2683 // are running in. This is typically from -60 to +60. 2684 // The setting of the lwp priorities in done after a call to thr_setprio 2685 // so Java priorities are mapped to libthread priorities and we map from 2686 // the latter to lwp priorities. We don't keep priorities stored in 2687 // Java priorities since some of our worker threads want to set priorities 2688 // higher than all Java threads. 2689 // 2690 // For related information: 2691 // (1) man -s 2 priocntl 2692 // (2) man -s 4 priocntl 2693 // (3) man dispadmin 2694 // = librt.so 2695 // = libthread/common/rtsched.c - thrp_setlwpprio(). 2696 // = ps -cL <pid> ... to validate priority. 2697 // = sched_get_priority_min and _max 2698 // pthread_create 2699 // sched_setparam 2700 // pthread_setschedparam 2701 // 2702 // Assumptions: 2703 // + We assume that all threads in the process belong to the same 2704 // scheduling class. IE. an homogenous process. 2705 // + Must be root or in IA group to change change "interactive" attribute. 2706 // Priocntl() will fail silently. The only indication of failure is when 2707 // we read-back the value and notice that it hasn't changed. 2708 // + Interactive threads enter the runq at the head, non-interactive at the tail. 2709 // + For RT, change timeslice as well. Invariant: 2710 // constant "priority integral" 2711 // Konst == TimeSlice * (60-Priority) 2712 // Given a priority, compute appropriate timeslice. 2713 // + Higher numerical values have higher priority. 2714 2715 // sched class attributes 2716 typedef struct { 2717 int schedPolicy; // classID 2718 int maxPrio; 2719 int minPrio; 2720 } SchedInfo; 2721 2722 2723 static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits; 2724 2725 #ifdef ASSERT 2726 static int ReadBackValidate = 1; 2727 #endif 2728 static int myClass = 0; 2729 static int myMin = 0; 2730 static int myMax = 0; 2731 static int myCur = 0; 2732 static bool priocntl_enable = false; 2733 2734 static const int criticalPrio = FXCriticalPriority; 2735 static int java_MaxPriority_to_os_priority = 0; // Saved mapping 2736 2737 2738 // lwp_priocntl_init 2739 // 2740 // Try to determine the priority scale for our process. 2741 // 2742 // Return errno or 0 if OK. 2743 // 2744 static int lwp_priocntl_init() { 2745 int rslt; 2746 pcinfo_t ClassInfo; 2747 pcparms_t ParmInfo; 2748 int i; 2749 2750 if (!UseThreadPriorities) return 0; 2751 2752 // If ThreadPriorityPolicy is 1, switch tables 2753 if (ThreadPriorityPolicy == 1) { 2754 for (i = 0; i < CriticalPriority+1; i++) 2755 os::java_to_os_priority[i] = prio_policy1[i]; 2756 } 2757 if (UseCriticalJavaThreadPriority) { 2758 // MaxPriority always maps to the FX scheduling class and criticalPrio. 2759 // See set_native_priority() and set_lwp_class_and_priority(). 2760 // Save original MaxPriority mapping in case attempt to 2761 // use critical priority fails. 2762 java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority]; 2763 // Set negative to distinguish from other priorities 2764 os::java_to_os_priority[MaxPriority] = -criticalPrio; 2765 } 2766 2767 // Get IDs for a set of well-known scheduling classes. 2768 // TODO-FIXME: GETCLINFO returns the current # of classes in the 2769 // the system. We should have a loop that iterates over the 2770 // classID values, which are known to be "small" integers. 2771 2772 strcpy(ClassInfo.pc_clname, "TS"); 2773 ClassInfo.pc_cid = -1; 2774 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 2775 if (rslt < 0) return errno; 2776 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1"); 2777 tsLimits.schedPolicy = ClassInfo.pc_cid; 2778 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri; 2779 tsLimits.minPrio = -tsLimits.maxPrio; 2780 2781 strcpy(ClassInfo.pc_clname, "IA"); 2782 ClassInfo.pc_cid = -1; 2783 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 2784 if (rslt < 0) return errno; 2785 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1"); 2786 iaLimits.schedPolicy = ClassInfo.pc_cid; 2787 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri; 2788 iaLimits.minPrio = -iaLimits.maxPrio; 2789 2790 strcpy(ClassInfo.pc_clname, "RT"); 2791 ClassInfo.pc_cid = -1; 2792 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 2793 if (rslt < 0) return errno; 2794 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1"); 2795 rtLimits.schedPolicy = ClassInfo.pc_cid; 2796 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri; 2797 rtLimits.minPrio = 0; 2798 2799 strcpy(ClassInfo.pc_clname, "FX"); 2800 ClassInfo.pc_cid = -1; 2801 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 2802 if (rslt < 0) return errno; 2803 assert(ClassInfo.pc_cid != -1, "cid for FX class is -1"); 2804 fxLimits.schedPolicy = ClassInfo.pc_cid; 2805 fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri; 2806 fxLimits.minPrio = 0; 2807 2808 // Query our "current" scheduling class. 2809 // This will normally be IA, TS or, rarely, FX or RT. 2810 memset(&ParmInfo, 0, sizeof(ParmInfo)); 2811 ParmInfo.pc_cid = PC_CLNULL; 2812 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo); 2813 if (rslt < 0) return errno; 2814 myClass = ParmInfo.pc_cid; 2815 2816 // We now know our scheduling classId, get specific information 2817 // about the class. 2818 ClassInfo.pc_cid = myClass; 2819 ClassInfo.pc_clname[0] = 0; 2820 rslt = priocntl((idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo); 2821 if (rslt < 0) return errno; 2822 2823 if (ThreadPriorityVerbose) { 2824 tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname); 2825 } 2826 2827 memset(&ParmInfo, 0, sizeof(pcparms_t)); 2828 ParmInfo.pc_cid = PC_CLNULL; 2829 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo); 2830 if (rslt < 0) return errno; 2831 2832 if (ParmInfo.pc_cid == rtLimits.schedPolicy) { 2833 myMin = rtLimits.minPrio; 2834 myMax = rtLimits.maxPrio; 2835 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { 2836 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms; 2837 myMin = iaLimits.minPrio; 2838 myMax = iaLimits.maxPrio; 2839 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict 2840 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { 2841 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms; 2842 myMin = tsLimits.minPrio; 2843 myMax = tsLimits.maxPrio; 2844 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict 2845 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) { 2846 fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms; 2847 myMin = fxLimits.minPrio; 2848 myMax = fxLimits.maxPrio; 2849 myMax = MIN2(myMax, (int)fxInfo->fx_uprilim); // clamp - restrict 2850 } else { 2851 // No clue - punt 2852 if (ThreadPriorityVerbose) { 2853 tty->print_cr("Unknown scheduling class: %s ... \n", 2854 ClassInfo.pc_clname); 2855 } 2856 return EINVAL; // no clue, punt 2857 } 2858 2859 if (ThreadPriorityVerbose) { 2860 tty->print_cr("Thread priority Range: [%d..%d]\n", myMin, myMax); 2861 } 2862 2863 priocntl_enable = true; // Enable changing priorities 2864 return 0; 2865 } 2866 2867 #define IAPRI(x) ((iaparms_t *)((x).pc_clparms)) 2868 #define RTPRI(x) ((rtparms_t *)((x).pc_clparms)) 2869 #define TSPRI(x) ((tsparms_t *)((x).pc_clparms)) 2870 #define FXPRI(x) ((fxparms_t *)((x).pc_clparms)) 2871 2872 2873 // scale_to_lwp_priority 2874 // 2875 // Convert from the libthread "thr_setprio" scale to our current 2876 // lwp scheduling class scale. 2877 // 2878 static int scale_to_lwp_priority(int rMin, int rMax, int x) { 2879 int v; 2880 2881 if (x == 127) return rMax; // avoid round-down 2882 v = (((x*(rMax-rMin)))/128)+rMin; 2883 return v; 2884 } 2885 2886 2887 // set_lwp_class_and_priority 2888 int set_lwp_class_and_priority(int ThreadID, int lwpid, 2889 int newPrio, int new_class, bool scale) { 2890 int rslt; 2891 int Actual, Expected, prv; 2892 pcparms_t ParmInfo; // for GET-SET 2893 #ifdef ASSERT 2894 pcparms_t ReadBack; // for readback 2895 #endif 2896 2897 // Set priority via PC_GETPARMS, update, PC_SETPARMS 2898 // Query current values. 2899 // TODO: accelerate this by eliminating the PC_GETPARMS call. 2900 // Cache "pcparms_t" in global ParmCache. 2901 // TODO: elide set-to-same-value 2902 2903 // If something went wrong on init, don't change priorities. 2904 if (!priocntl_enable) { 2905 if (ThreadPriorityVerbose) { 2906 tty->print_cr("Trying to set priority but init failed, ignoring"); 2907 } 2908 return EINVAL; 2909 } 2910 2911 // If lwp hasn't started yet, just return 2912 // the _start routine will call us again. 2913 if (lwpid <= 0) { 2914 if (ThreadPriorityVerbose) { 2915 tty->print_cr("deferring the set_lwp_class_and_priority of thread " 2916 INTPTR_FORMAT " to %d, lwpid not set", 2917 ThreadID, newPrio); 2918 } 2919 return 0; 2920 } 2921 2922 if (ThreadPriorityVerbose) { 2923 tty->print_cr ("set_lwp_class_and_priority(" 2924 INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ", 2925 ThreadID, lwpid, newPrio); 2926 } 2927 2928 memset(&ParmInfo, 0, sizeof(pcparms_t)); 2929 ParmInfo.pc_cid = PC_CLNULL; 2930 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo); 2931 if (rslt < 0) return errno; 2932 2933 int cur_class = ParmInfo.pc_cid; 2934 ParmInfo.pc_cid = (id_t)new_class; 2935 2936 if (new_class == rtLimits.schedPolicy) { 2937 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms; 2938 rtInfo->rt_pri = scale ? scale_to_lwp_priority(rtLimits.minPrio, 2939 rtLimits.maxPrio, newPrio) 2940 : newPrio; 2941 rtInfo->rt_tqsecs = RT_NOCHANGE; 2942 rtInfo->rt_tqnsecs = RT_NOCHANGE; 2943 if (ThreadPriorityVerbose) { 2944 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri); 2945 } 2946 } else if (new_class == iaLimits.schedPolicy) { 2947 iaparms_t* iaInfo = (iaparms_t*)ParmInfo.pc_clparms; 2948 int maxClamped = MIN2(iaLimits.maxPrio, 2949 cur_class == new_class 2950 ? (int)iaInfo->ia_uprilim : iaLimits.maxPrio); 2951 iaInfo->ia_upri = scale ? scale_to_lwp_priority(iaLimits.minPrio, 2952 maxClamped, newPrio) 2953 : newPrio; 2954 iaInfo->ia_uprilim = cur_class == new_class 2955 ? IA_NOCHANGE : (pri_t)iaLimits.maxPrio; 2956 iaInfo->ia_mode = IA_NOCHANGE; 2957 if (ThreadPriorityVerbose) { 2958 tty->print_cr("IA: [%d...%d] %d->%d\n", 2959 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri); 2960 } 2961 } else if (new_class == tsLimits.schedPolicy) { 2962 tsparms_t* tsInfo = (tsparms_t*)ParmInfo.pc_clparms; 2963 int maxClamped = MIN2(tsLimits.maxPrio, 2964 cur_class == new_class 2965 ? (int)tsInfo->ts_uprilim : tsLimits.maxPrio); 2966 tsInfo->ts_upri = scale ? scale_to_lwp_priority(tsLimits.minPrio, 2967 maxClamped, newPrio) 2968 : newPrio; 2969 tsInfo->ts_uprilim = cur_class == new_class 2970 ? TS_NOCHANGE : (pri_t)tsLimits.maxPrio; 2971 if (ThreadPriorityVerbose) { 2972 tty->print_cr("TS: [%d...%d] %d->%d\n", 2973 tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri); 2974 } 2975 } else if (new_class == fxLimits.schedPolicy) { 2976 fxparms_t* fxInfo = (fxparms_t*)ParmInfo.pc_clparms; 2977 int maxClamped = MIN2(fxLimits.maxPrio, 2978 cur_class == new_class 2979 ? (int)fxInfo->fx_uprilim : fxLimits.maxPrio); 2980 fxInfo->fx_upri = scale ? scale_to_lwp_priority(fxLimits.minPrio, 2981 maxClamped, newPrio) 2982 : newPrio; 2983 fxInfo->fx_uprilim = cur_class == new_class 2984 ? FX_NOCHANGE : (pri_t)fxLimits.maxPrio; 2985 fxInfo->fx_tqsecs = FX_NOCHANGE; 2986 fxInfo->fx_tqnsecs = FX_NOCHANGE; 2987 if (ThreadPriorityVerbose) { 2988 tty->print_cr("FX: [%d...%d] %d->%d\n", 2989 fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri); 2990 } 2991 } else { 2992 if (ThreadPriorityVerbose) { 2993 tty->print_cr("Unknown new scheduling class %d\n", new_class); 2994 } 2995 return EINVAL; // no clue, punt 2996 } 2997 2998 rslt = priocntl(P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo); 2999 if (ThreadPriorityVerbose && rslt) { 3000 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno); 3001 } 3002 if (rslt < 0) return errno; 3003 3004 #ifdef ASSERT 3005 // Sanity check: read back what we just attempted to set. 3006 // In theory it could have changed in the interim ... 3007 // 3008 // The priocntl system call is tricky. 3009 // Sometimes it'll validate the priority value argument and 3010 // return EINVAL if unhappy. At other times it fails silently. 3011 // Readbacks are prudent. 3012 3013 if (!ReadBackValidate) return 0; 3014 3015 memset(&ReadBack, 0, sizeof(pcparms_t)); 3016 ReadBack.pc_cid = PC_CLNULL; 3017 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack); 3018 assert(rslt >= 0, "priocntl failed"); 3019 Actual = Expected = 0xBAD; 3020 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match"); 3021 if (ParmInfo.pc_cid == rtLimits.schedPolicy) { 3022 Actual = RTPRI(ReadBack)->rt_pri; 3023 Expected = RTPRI(ParmInfo)->rt_pri; 3024 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { 3025 Actual = IAPRI(ReadBack)->ia_upri; 3026 Expected = IAPRI(ParmInfo)->ia_upri; 3027 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { 3028 Actual = TSPRI(ReadBack)->ts_upri; 3029 Expected = TSPRI(ParmInfo)->ts_upri; 3030 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) { 3031 Actual = FXPRI(ReadBack)->fx_upri; 3032 Expected = FXPRI(ParmInfo)->fx_upri; 3033 } else { 3034 if (ThreadPriorityVerbose) { 3035 tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n", 3036 ParmInfo.pc_cid); 3037 } 3038 } 3039 3040 if (Actual != Expected) { 3041 if (ThreadPriorityVerbose) { 3042 tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n", 3043 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected); 3044 } 3045 } 3046 #endif 3047 3048 return 0; 3049 } 3050 3051 // Solaris only gives access to 128 real priorities at a time, 3052 // so we expand Java's ten to fill this range. This would be better 3053 // if we dynamically adjusted relative priorities. 3054 // 3055 // The ThreadPriorityPolicy option allows us to select 2 different 3056 // priority scales. 3057 // 3058 // ThreadPriorityPolicy=0 3059 // Since the Solaris' default priority is MaximumPriority, we do not 3060 // set a priority lower than Max unless a priority lower than 3061 // NormPriority is requested. 3062 // 3063 // ThreadPriorityPolicy=1 3064 // This mode causes the priority table to get filled with 3065 // linear values. NormPriority get's mapped to 50% of the 3066 // Maximum priority an so on. This will cause VM threads 3067 // to get unfair treatment against other Solaris processes 3068 // which do not explicitly alter their thread priorities. 3069 3070 int os::java_to_os_priority[CriticalPriority + 1] = { 3071 -99999, // 0 Entry should never be used 3072 3073 0, // 1 MinPriority 3074 32, // 2 3075 64, // 3 3076 3077 96, // 4 3078 127, // 5 NormPriority 3079 127, // 6 3080 3081 127, // 7 3082 127, // 8 3083 127, // 9 NearMaxPriority 3084 3085 127, // 10 MaxPriority 3086 3087 -criticalPrio // 11 CriticalPriority 3088 }; 3089 3090 OSReturn os::set_native_priority(Thread* thread, int newpri) { 3091 OSThread* osthread = thread->osthread(); 3092 3093 // Save requested priority in case the thread hasn't been started 3094 osthread->set_native_priority(newpri); 3095 3096 // Check for critical priority request 3097 bool fxcritical = false; 3098 if (newpri == -criticalPrio) { 3099 fxcritical = true; 3100 newpri = criticalPrio; 3101 } 3102 3103 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping"); 3104 if (!UseThreadPriorities) return OS_OK; 3105 3106 int status = 0; 3107 3108 if (!fxcritical) { 3109 // Use thr_setprio only if we have a priority that thr_setprio understands 3110 status = thr_setprio(thread->osthread()->thread_id(), newpri); 3111 } 3112 3113 int lwp_status = 3114 set_lwp_class_and_priority(osthread->thread_id(), 3115 osthread->lwp_id(), 3116 newpri, 3117 fxcritical ? fxLimits.schedPolicy : myClass, 3118 !fxcritical); 3119 if (lwp_status != 0 && fxcritical) { 3120 // Try again, this time without changing the scheduling class 3121 newpri = java_MaxPriority_to_os_priority; 3122 lwp_status = set_lwp_class_and_priority(osthread->thread_id(), 3123 osthread->lwp_id(), 3124 newpri, myClass, false); 3125 } 3126 status |= lwp_status; 3127 return (status == 0) ? OS_OK : OS_ERR; 3128 } 3129 3130 3131 OSReturn os::get_native_priority(const Thread* const thread, 3132 int *priority_ptr) { 3133 int p; 3134 if (!UseThreadPriorities) { 3135 *priority_ptr = NormalPriority; 3136 return OS_OK; 3137 } 3138 int status = thr_getprio(thread->osthread()->thread_id(), &p); 3139 if (status != 0) { 3140 return OS_ERR; 3141 } 3142 *priority_ptr = p; 3143 return OS_OK; 3144 } 3145 3146 //////////////////////////////////////////////////////////////////////////////// 3147 // suspend/resume support 3148 3149 // The low-level signal-based suspend/resume support is a remnant from the 3150 // old VM-suspension that used to be for java-suspension, safepoints etc, 3151 // within hotspot. Currently used by JFR's OSThreadSampler 3152 // 3153 // The remaining code is greatly simplified from the more general suspension 3154 // code that used to be used. 3155 // 3156 // The protocol is quite simple: 3157 // - suspend: 3158 // - sends a signal to the target thread 3159 // - polls the suspend state of the osthread using a yield loop 3160 // - target thread signal handler (SR_handler) sets suspend state 3161 // and blocks in sigsuspend until continued 3162 // - resume: 3163 // - sets target osthread state to continue 3164 // - sends signal to end the sigsuspend loop in the SR_handler 3165 // 3166 // Note that the SR_lock plays no role in this suspend/resume protocol, 3167 // but is checked for NULL in SR_handler as a thread termination indicator. 3168 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs. 3169 // 3170 // Note that resume_clear_context() and suspend_save_context() are needed 3171 // by SR_handler(), so that fetch_frame_from_ucontext() works, 3172 // which in part is used by: 3173 // - Forte Analyzer: AsyncGetCallTrace() 3174 // - StackBanging: get_frame_at_stack_banging_point() 3175 // - JFR: get_topframe()-->....-->get_valid_uc_in_signal_handler() 3176 3177 static void resume_clear_context(OSThread *osthread) { 3178 osthread->set_ucontext(NULL); 3179 } 3180 3181 static void suspend_save_context(OSThread *osthread, ucontext_t* context) { 3182 osthread->set_ucontext(context); 3183 } 3184 3185 static PosixSemaphore sr_semaphore; 3186 3187 void os::Solaris::SR_handler(Thread* thread, ucontext_t* context) { 3188 // Save and restore errno to avoid confusing native code with EINTR 3189 // after sigsuspend. 3190 int old_errno = errno; 3191 3192 OSThread* osthread = thread->osthread(); 3193 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); 3194 3195 os::SuspendResume::State current = osthread->sr.state(); 3196 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { 3197 suspend_save_context(osthread, context); 3198 3199 // attempt to switch the state, we assume we had a SUSPEND_REQUEST 3200 os::SuspendResume::State state = osthread->sr.suspended(); 3201 if (state == os::SuspendResume::SR_SUSPENDED) { 3202 sigset_t suspend_set; // signals for sigsuspend() 3203 3204 // get current set of blocked signals and unblock resume signal 3205 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); 3206 sigdelset(&suspend_set, ASYNC_SIGNAL); 3207 3208 sr_semaphore.signal(); 3209 // wait here until we are resumed 3210 while (1) { 3211 sigsuspend(&suspend_set); 3212 3213 os::SuspendResume::State result = osthread->sr.running(); 3214 if (result == os::SuspendResume::SR_RUNNING) { 3215 sr_semaphore.signal(); 3216 break; 3217 } 3218 } 3219 3220 } else if (state == os::SuspendResume::SR_RUNNING) { 3221 // request was cancelled, continue 3222 } else { 3223 ShouldNotReachHere(); 3224 } 3225 3226 resume_clear_context(osthread); 3227 } else if (current == os::SuspendResume::SR_RUNNING) { 3228 // request was cancelled, continue 3229 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { 3230 // ignore 3231 } else { 3232 // ignore 3233 } 3234 3235 errno = old_errno; 3236 } 3237 3238 void os::print_statistics() { 3239 } 3240 3241 bool os::message_box(const char* title, const char* message) { 3242 int i; 3243 fdStream err(defaultStream::error_fd()); 3244 for (i = 0; i < 78; i++) err.print_raw("="); 3245 err.cr(); 3246 err.print_raw_cr(title); 3247 for (i = 0; i < 78; i++) err.print_raw("-"); 3248 err.cr(); 3249 err.print_raw_cr(message); 3250 for (i = 0; i < 78; i++) err.print_raw("="); 3251 err.cr(); 3252 3253 char buf[16]; 3254 // Prevent process from exiting upon "read error" without consuming all CPU 3255 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 3256 3257 return buf[0] == 'y' || buf[0] == 'Y'; 3258 } 3259 3260 static int sr_notify(OSThread* osthread) { 3261 int status = thr_kill(osthread->thread_id(), ASYNC_SIGNAL); 3262 assert_status(status == 0, status, "thr_kill"); 3263 return status; 3264 } 3265 3266 // "Randomly" selected value for how long we want to spin 3267 // before bailing out on suspending a thread, also how often 3268 // we send a signal to a thread we want to resume 3269 static const int RANDOMLY_LARGE_INTEGER = 1000000; 3270 static const int RANDOMLY_LARGE_INTEGER2 = 100; 3271 3272 static bool do_suspend(OSThread* osthread) { 3273 assert(osthread->sr.is_running(), "thread should be running"); 3274 assert(!sr_semaphore.trywait(), "semaphore has invalid state"); 3275 3276 // mark as suspended and send signal 3277 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { 3278 // failed to switch, state wasn't running? 3279 ShouldNotReachHere(); 3280 return false; 3281 } 3282 3283 if (sr_notify(osthread) != 0) { 3284 ShouldNotReachHere(); 3285 } 3286 3287 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED 3288 while (true) { 3289 if (sr_semaphore.timedwait(2000)) { 3290 break; 3291 } else { 3292 // timeout 3293 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); 3294 if (cancelled == os::SuspendResume::SR_RUNNING) { 3295 return false; 3296 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { 3297 // make sure that we consume the signal on the semaphore as well 3298 sr_semaphore.wait(); 3299 break; 3300 } else { 3301 ShouldNotReachHere(); 3302 return false; 3303 } 3304 } 3305 } 3306 3307 guarantee(osthread->sr.is_suspended(), "Must be suspended"); 3308 return true; 3309 } 3310 3311 static void do_resume(OSThread* osthread) { 3312 assert(osthread->sr.is_suspended(), "thread should be suspended"); 3313 assert(!sr_semaphore.trywait(), "invalid semaphore state"); 3314 3315 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { 3316 // failed to switch to WAKEUP_REQUEST 3317 ShouldNotReachHere(); 3318 return; 3319 } 3320 3321 while (true) { 3322 if (sr_notify(osthread) == 0) { 3323 if (sr_semaphore.timedwait(2)) { 3324 if (osthread->sr.is_running()) { 3325 return; 3326 } 3327 } 3328 } else { 3329 ShouldNotReachHere(); 3330 } 3331 } 3332 3333 guarantee(osthread->sr.is_running(), "Must be running!"); 3334 } 3335 3336 void os::SuspendedThreadTask::internal_do_task() { 3337 if (do_suspend(_thread->osthread())) { 3338 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); 3339 do_task(context); 3340 do_resume(_thread->osthread()); 3341 } 3342 } 3343 3344 // This does not do anything on Solaris. This is basically a hook for being 3345 // able to use structured exception handling (thread-local exception filters) on, e.g., Win32. 3346 void os::os_exception_wrapper(java_call_t f, JavaValue* value, 3347 const methodHandle& method, JavaCallArguments* args, 3348 Thread* thread) { 3349 f(value, method, args, thread); 3350 } 3351 3352 // This routine may be used by user applications as a "hook" to catch signals. 3353 // The user-defined signal handler must pass unrecognized signals to this 3354 // routine, and if it returns true (non-zero), then the signal handler must 3355 // return immediately. If the flag "abort_if_unrecognized" is true, then this 3356 // routine will never retun false (zero), but instead will execute a VM panic 3357 // routine kill the process. 3358 // 3359 // If this routine returns false, it is OK to call it again. This allows 3360 // the user-defined signal handler to perform checks either before or after 3361 // the VM performs its own checks. Naturally, the user code would be making 3362 // a serious error if it tried to handle an exception (such as a null check 3363 // or breakpoint) that the VM was generating for its own correct operation. 3364 // 3365 // This routine may recognize any of the following kinds of signals: 3366 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ, 3367 // ASYNC_SIGNAL. 3368 // It should be consulted by handlers for any of those signals. 3369 // 3370 // The caller of this routine must pass in the three arguments supplied 3371 // to the function referred to in the "sa_sigaction" (not the "sa_handler") 3372 // field of the structure passed to sigaction(). This routine assumes that 3373 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 3374 // 3375 // Note that the VM will print warnings if it detects conflicting signal 3376 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 3377 // 3378 extern "C" JNIEXPORT int JVM_handle_solaris_signal(int signo, 3379 siginfo_t* siginfo, 3380 void* ucontext, 3381 int abort_if_unrecognized); 3382 3383 3384 void signalHandler(int sig, siginfo_t* info, void* ucVoid) { 3385 int orig_errno = errno; // Preserve errno value over signal handler. 3386 JVM_handle_solaris_signal(sig, info, ucVoid, true); 3387 errno = orig_errno; 3388 } 3389 3390 // This boolean allows users to forward their own non-matching signals 3391 // to JVM_handle_solaris_signal, harmlessly. 3392 bool os::Solaris::signal_handlers_are_installed = false; 3393 3394 // For signal-chaining 3395 bool os::Solaris::libjsig_is_loaded = false; 3396 typedef struct sigaction *(*get_signal_t)(int); 3397 get_signal_t os::Solaris::get_signal_action = NULL; 3398 3399 struct sigaction* os::Solaris::get_chained_signal_action(int sig) { 3400 struct sigaction *actp = NULL; 3401 3402 if ((libjsig_is_loaded) && (sig <= Maxsignum)) { 3403 // Retrieve the old signal handler from libjsig 3404 actp = (*get_signal_action)(sig); 3405 } 3406 if (actp == NULL) { 3407 // Retrieve the preinstalled signal handler from jvm 3408 actp = get_preinstalled_handler(sig); 3409 } 3410 3411 return actp; 3412 } 3413 3414 static bool call_chained_handler(struct sigaction *actp, int sig, 3415 siginfo_t *siginfo, void *context) { 3416 // Call the old signal handler 3417 if (actp->sa_handler == SIG_DFL) { 3418 // It's more reasonable to let jvm treat it as an unexpected exception 3419 // instead of taking the default action. 3420 return false; 3421 } else if (actp->sa_handler != SIG_IGN) { 3422 if ((actp->sa_flags & SA_NODEFER) == 0) { 3423 // automaticlly block the signal 3424 sigaddset(&(actp->sa_mask), sig); 3425 } 3426 3427 sa_handler_t hand; 3428 sa_sigaction_t sa; 3429 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 3430 // retrieve the chained handler 3431 if (siginfo_flag_set) { 3432 sa = actp->sa_sigaction; 3433 } else { 3434 hand = actp->sa_handler; 3435 } 3436 3437 if ((actp->sa_flags & SA_RESETHAND) != 0) { 3438 actp->sa_handler = SIG_DFL; 3439 } 3440 3441 // try to honor the signal mask 3442 sigset_t oset; 3443 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); 3444 3445 // call into the chained handler 3446 if (siginfo_flag_set) { 3447 (*sa)(sig, siginfo, context); 3448 } else { 3449 (*hand)(sig); 3450 } 3451 3452 // restore the signal mask 3453 pthread_sigmask(SIG_SETMASK, &oset, 0); 3454 } 3455 // Tell jvm's signal handler the signal is taken care of. 3456 return true; 3457 } 3458 3459 bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) { 3460 bool chained = false; 3461 // signal-chaining 3462 if (UseSignalChaining) { 3463 struct sigaction *actp = get_chained_signal_action(sig); 3464 if (actp != NULL) { 3465 chained = call_chained_handler(actp, sig, siginfo, context); 3466 } 3467 } 3468 return chained; 3469 } 3470 3471 struct sigaction* os::Solaris::get_preinstalled_handler(int sig) { 3472 assert((chainedsigactions != (struct sigaction *)NULL) && 3473 (preinstalled_sigs != (int *)NULL), "signals not yet initialized"); 3474 if (preinstalled_sigs[sig] != 0) { 3475 return &chainedsigactions[sig]; 3476 } 3477 return NULL; 3478 } 3479 3480 void os::Solaris::save_preinstalled_handler(int sig, 3481 struct sigaction& oldAct) { 3482 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range"); 3483 assert((chainedsigactions != (struct sigaction *)NULL) && 3484 (preinstalled_sigs != (int *)NULL), "signals not yet initialized"); 3485 chainedsigactions[sig] = oldAct; 3486 preinstalled_sigs[sig] = 1; 3487 } 3488 3489 void os::Solaris::set_signal_handler(int sig, bool set_installed, 3490 bool oktochain) { 3491 // Check for overwrite. 3492 struct sigaction oldAct; 3493 sigaction(sig, (struct sigaction*)NULL, &oldAct); 3494 void* oldhand = 3495 oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3496 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3497 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 3498 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 3499 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) { 3500 if (AllowUserSignalHandlers || !set_installed) { 3501 // Do not overwrite; user takes responsibility to forward to us. 3502 return; 3503 } else if (UseSignalChaining) { 3504 if (oktochain) { 3505 // save the old handler in jvm 3506 save_preinstalled_handler(sig, oldAct); 3507 } else { 3508 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal."); 3509 } 3510 // libjsig also interposes the sigaction() call below and saves the 3511 // old sigaction on it own. 3512 } else { 3513 fatal("Encountered unexpected pre-existing sigaction handler " 3514 "%#lx for signal %d.", (long)oldhand, sig); 3515 } 3516 } 3517 3518 struct sigaction sigAct; 3519 sigfillset(&(sigAct.sa_mask)); 3520 sigAct.sa_handler = SIG_DFL; 3521 3522 sigAct.sa_sigaction = signalHandler; 3523 // Handle SIGSEGV on alternate signal stack if 3524 // not using stack banging 3525 if (!UseStackBanging && sig == SIGSEGV) { 3526 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK; 3527 } else { 3528 sigAct.sa_flags = SA_SIGINFO | SA_RESTART; 3529 } 3530 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags); 3531 3532 sigaction(sig, &sigAct, &oldAct); 3533 3534 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3535 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3536 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 3537 } 3538 3539 3540 #define DO_SIGNAL_CHECK(sig) \ 3541 do { \ 3542 if (!sigismember(&check_signal_done, sig)) { \ 3543 os::Solaris::check_signal_handler(sig); \ 3544 } \ 3545 } while (0) 3546 3547 // This method is a periodic task to check for misbehaving JNI applications 3548 // under CheckJNI, we can add any periodic checks here 3549 3550 void os::run_periodic_checks() { 3551 // A big source of grief is hijacking virt. addr 0x0 on Solaris, 3552 // thereby preventing a NULL checks. 3553 if (!check_addr0_done) check_addr0_done = check_addr0(tty); 3554 3555 if (check_signals == false) return; 3556 3557 // SEGV and BUS if overridden could potentially prevent 3558 // generation of hs*.log in the event of a crash, debugging 3559 // such a case can be very challenging, so we absolutely 3560 // check for the following for a good measure: 3561 DO_SIGNAL_CHECK(SIGSEGV); 3562 DO_SIGNAL_CHECK(SIGILL); 3563 DO_SIGNAL_CHECK(SIGFPE); 3564 DO_SIGNAL_CHECK(SIGBUS); 3565 DO_SIGNAL_CHECK(SIGPIPE); 3566 DO_SIGNAL_CHECK(SIGXFSZ); 3567 DO_SIGNAL_CHECK(ASYNC_SIGNAL); 3568 3569 // ReduceSignalUsage allows the user to override these handlers 3570 // see comments at the very top and jvm_solaris.h 3571 if (!ReduceSignalUsage) { 3572 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 3573 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 3574 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 3575 DO_SIGNAL_CHECK(BREAK_SIGNAL); 3576 } 3577 } 3578 3579 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 3580 3581 static os_sigaction_t os_sigaction = NULL; 3582 3583 void os::Solaris::check_signal_handler(int sig) { 3584 char buf[O_BUFLEN]; 3585 address jvmHandler = NULL; 3586 3587 struct sigaction act; 3588 if (os_sigaction == NULL) { 3589 // only trust the default sigaction, in case it has been interposed 3590 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); 3591 if (os_sigaction == NULL) return; 3592 } 3593 3594 os_sigaction(sig, (struct sigaction*)NULL, &act); 3595 3596 address thisHandler = (act.sa_flags & SA_SIGINFO) 3597 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 3598 : CAST_FROM_FN_PTR(address, act.sa_handler); 3599 3600 3601 switch (sig) { 3602 case SIGSEGV: 3603 case SIGBUS: 3604 case SIGFPE: 3605 case SIGPIPE: 3606 case SIGXFSZ: 3607 case SIGILL: 3608 case ASYNC_SIGNAL: 3609 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler); 3610 break; 3611 3612 case SHUTDOWN1_SIGNAL: 3613 case SHUTDOWN2_SIGNAL: 3614 case SHUTDOWN3_SIGNAL: 3615 case BREAK_SIGNAL: 3616 jvmHandler = (address)user_handler(); 3617 break; 3618 3619 default: 3620 return; 3621 } 3622 3623 if (thisHandler != jvmHandler) { 3624 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 3625 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 3626 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 3627 // No need to check this sig any longer 3628 sigaddset(&check_signal_done, sig); 3629 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN 3630 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) { 3631 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell", 3632 exception_name(sig, buf, O_BUFLEN)); 3633 } 3634 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) { 3635 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 3636 tty->print("expected:"); 3637 os::Posix::print_sa_flags(tty, os::Solaris::get_our_sigflags(sig)); 3638 tty->cr(); 3639 tty->print(" found:"); 3640 os::Posix::print_sa_flags(tty, act.sa_flags); 3641 tty->cr(); 3642 // No need to check this sig any longer 3643 sigaddset(&check_signal_done, sig); 3644 } 3645 3646 // Print all the signal handler state 3647 if (sigismember(&check_signal_done, sig)) { 3648 print_signal_handlers(tty, buf, O_BUFLEN); 3649 } 3650 3651 } 3652 3653 void os::Solaris::install_signal_handlers() { 3654 signal_handlers_are_installed = true; 3655 3656 // signal-chaining 3657 typedef void (*signal_setting_t)(); 3658 signal_setting_t begin_signal_setting = NULL; 3659 signal_setting_t end_signal_setting = NULL; 3660 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3661 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 3662 if (begin_signal_setting != NULL) { 3663 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3664 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 3665 get_signal_action = CAST_TO_FN_PTR(get_signal_t, 3666 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 3667 libjsig_is_loaded = true; 3668 assert(UseSignalChaining, "should enable signal-chaining"); 3669 } 3670 if (libjsig_is_loaded) { 3671 // Tell libjsig jvm is setting signal handlers 3672 (*begin_signal_setting)(); 3673 } 3674 3675 set_signal_handler(SIGSEGV, true, true); 3676 set_signal_handler(SIGPIPE, true, true); 3677 set_signal_handler(SIGXFSZ, true, true); 3678 set_signal_handler(SIGBUS, true, true); 3679 set_signal_handler(SIGILL, true, true); 3680 set_signal_handler(SIGFPE, true, true); 3681 set_signal_handler(ASYNC_SIGNAL, true, true); 3682 3683 if (libjsig_is_loaded) { 3684 // Tell libjsig jvm finishes setting signal handlers 3685 (*end_signal_setting)(); 3686 } 3687 3688 // We don't activate signal checker if libjsig is in place, we trust ourselves 3689 // and if UserSignalHandler is installed all bets are off. 3690 // Log that signal checking is off only if -verbose:jni is specified. 3691 if (CheckJNICalls) { 3692 if (libjsig_is_loaded) { 3693 log_debug(jni, resolve)("Info: libjsig is activated, all active signal checking is disabled"); 3694 check_signals = false; 3695 } 3696 if (AllowUserSignalHandlers) { 3697 log_debug(jni, resolve)("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 3698 check_signals = false; 3699 } 3700 } 3701 } 3702 3703 3704 void report_error(const char* file_name, int line_no, const char* title, 3705 const char* format, ...); 3706 3707 // (Static) wrappers for the liblgrp API 3708 os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home; 3709 os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init; 3710 os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini; 3711 os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root; 3712 os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children; 3713 os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources; 3714 os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps; 3715 os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale; 3716 os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0; 3717 3718 static address resolve_symbol_lazy(const char* name) { 3719 address addr = (address) dlsym(RTLD_DEFAULT, name); 3720 if (addr == NULL) { 3721 // RTLD_DEFAULT was not defined on some early versions of 2.5.1 3722 addr = (address) dlsym(RTLD_NEXT, name); 3723 } 3724 return addr; 3725 } 3726 3727 static address resolve_symbol(const char* name) { 3728 address addr = resolve_symbol_lazy(name); 3729 if (addr == NULL) { 3730 fatal(dlerror()); 3731 } 3732 return addr; 3733 } 3734 3735 void os::Solaris::libthread_init() { 3736 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators"); 3737 3738 lwp_priocntl_init(); 3739 3740 // RTLD_DEFAULT was not defined on some early versions of 5.5.1 3741 if (func == NULL) { 3742 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators"); 3743 // Guarantee that this VM is running on an new enough OS (5.6 or 3744 // later) that it will have a new enough libthread.so. 3745 guarantee(func != NULL, "libthread.so is too old."); 3746 } 3747 3748 int size; 3749 void (*handler_info_func)(address *, int *); 3750 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo")); 3751 handler_info_func(&handler_start, &size); 3752 handler_end = handler_start + size; 3753 } 3754 3755 3756 int_fnP_mutex_tP os::Solaris::_mutex_lock; 3757 int_fnP_mutex_tP os::Solaris::_mutex_trylock; 3758 int_fnP_mutex_tP os::Solaris::_mutex_unlock; 3759 int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init; 3760 int_fnP_mutex_tP os::Solaris::_mutex_destroy; 3761 int os::Solaris::_mutex_scope = USYNC_THREAD; 3762 3763 int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait; 3764 int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait; 3765 int_fnP_cond_tP os::Solaris::_cond_signal; 3766 int_fnP_cond_tP os::Solaris::_cond_broadcast; 3767 int_fnP_cond_tP_i_vP os::Solaris::_cond_init; 3768 int_fnP_cond_tP os::Solaris::_cond_destroy; 3769 int os::Solaris::_cond_scope = USYNC_THREAD; 3770 bool os::Solaris::_synchronization_initialized; 3771 3772 void os::Solaris::synchronization_init() { 3773 if (UseLWPSynchronization) { 3774 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock"))); 3775 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock"))); 3776 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock"))); 3777 os::Solaris::set_mutex_init(lwp_mutex_init); 3778 os::Solaris::set_mutex_destroy(lwp_mutex_destroy); 3779 os::Solaris::set_mutex_scope(USYNC_THREAD); 3780 3781 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait"))); 3782 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait"))); 3783 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal"))); 3784 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast"))); 3785 os::Solaris::set_cond_init(lwp_cond_init); 3786 os::Solaris::set_cond_destroy(lwp_cond_destroy); 3787 os::Solaris::set_cond_scope(USYNC_THREAD); 3788 } else { 3789 os::Solaris::set_mutex_scope(USYNC_THREAD); 3790 os::Solaris::set_cond_scope(USYNC_THREAD); 3791 3792 if (UsePthreads) { 3793 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock"))); 3794 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock"))); 3795 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock"))); 3796 os::Solaris::set_mutex_init(pthread_mutex_default_init); 3797 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy"))); 3798 3799 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait"))); 3800 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait"))); 3801 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal"))); 3802 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast"))); 3803 os::Solaris::set_cond_init(pthread_cond_default_init); 3804 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy"))); 3805 } else { 3806 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock"))); 3807 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock"))); 3808 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock"))); 3809 os::Solaris::set_mutex_init(::mutex_init); 3810 os::Solaris::set_mutex_destroy(::mutex_destroy); 3811 3812 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait"))); 3813 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait"))); 3814 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal"))); 3815 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast"))); 3816 os::Solaris::set_cond_init(::cond_init); 3817 os::Solaris::set_cond_destroy(::cond_destroy); 3818 } 3819 } 3820 _synchronization_initialized = true; 3821 } 3822 3823 bool os::Solaris::liblgrp_init() { 3824 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY); 3825 if (handle != NULL) { 3826 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home"))); 3827 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init"))); 3828 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini"))); 3829 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root"))); 3830 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children"))); 3831 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources"))); 3832 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps"))); 3833 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t, 3834 dlsym(handle, "lgrp_cookie_stale"))); 3835 3836 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER); 3837 set_lgrp_cookie(c); 3838 return true; 3839 } 3840 return false; 3841 } 3842 3843 // int pset_getloadavg(psetid_t pset, double loadavg[], int nelem); 3844 typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem); 3845 static pset_getloadavg_type pset_getloadavg_ptr = NULL; 3846 3847 void init_pset_getloadavg_ptr(void) { 3848 pset_getloadavg_ptr = 3849 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg"); 3850 if (pset_getloadavg_ptr == NULL) { 3851 log_warning(os)("pset_getloadavg function not found"); 3852 } 3853 } 3854 3855 int os::Solaris::_dev_zero_fd = -1; 3856 3857 // this is called _before_ the global arguments have been parsed 3858 void os::init(void) { 3859 _initial_pid = getpid(); 3860 3861 max_hrtime = first_hrtime = gethrtime(); 3862 3863 init_random(1234567); 3864 3865 page_size = sysconf(_SC_PAGESIZE); 3866 if (page_size == -1) { 3867 fatal("os_solaris.cpp: os::init: sysconf failed (%s)", os::strerror(errno)); 3868 } 3869 init_page_sizes((size_t) page_size); 3870 3871 Solaris::initialize_system_info(); 3872 3873 int fd = ::open("/dev/zero", O_RDWR); 3874 if (fd < 0) { 3875 fatal("os::init: cannot open /dev/zero (%s)", os::strerror(errno)); 3876 } else { 3877 Solaris::set_dev_zero_fd(fd); 3878 3879 // Close on exec, child won't inherit. 3880 fcntl(fd, F_SETFD, FD_CLOEXEC); 3881 } 3882 3883 clock_tics_per_sec = CLK_TCK; 3884 3885 // check if dladdr1() exists; dladdr1 can provide more information than 3886 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9 3887 // and is available on linker patches for 5.7 and 5.8. 3888 // libdl.so must have been loaded, this call is just an entry lookup 3889 void * hdl = dlopen("libdl.so", RTLD_NOW); 3890 if (hdl) { 3891 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1")); 3892 } 3893 3894 // main_thread points to the thread that created/loaded the JVM. 3895 main_thread = thr_self(); 3896 3897 // dynamic lookup of functions that may not be available in our lowest 3898 // supported Solaris release 3899 void * handle = dlopen("libc.so.1", RTLD_LAZY); 3900 if (handle != NULL) { 3901 Solaris::_pthread_setname_np = // from 11.3 3902 (Solaris::pthread_setname_np_func_t)dlsym(handle, "pthread_setname_np"); 3903 } 3904 3905 // Shared Posix initialization 3906 os::Posix::init(); 3907 } 3908 3909 // To install functions for atexit system call 3910 extern "C" { 3911 static void perfMemory_exit_helper() { 3912 perfMemory_exit(); 3913 } 3914 } 3915 3916 // this is called _after_ the global arguments have been parsed 3917 jint os::init_2(void) { 3918 // try to enable extended file IO ASAP, see 6431278 3919 os::Solaris::try_enable_extended_io(); 3920 3921 // Check and sets minimum stack sizes against command line options 3922 if (Posix::set_minimum_stack_sizes() == JNI_ERR) { 3923 return JNI_ERR; 3924 } 3925 3926 Solaris::libthread_init(); 3927 3928 if (UseNUMA) { 3929 if (!Solaris::liblgrp_init()) { 3930 UseNUMA = false; 3931 } else { 3932 size_t lgrp_limit = os::numa_get_groups_num(); 3933 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtInternal); 3934 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit); 3935 FREE_C_HEAP_ARRAY(int, lgrp_ids); 3936 if (lgrp_num < 2) { 3937 // There's only one locality group, disable NUMA. 3938 UseNUMA = false; 3939 } 3940 } 3941 if (!UseNUMA && ForceNUMA) { 3942 UseNUMA = true; 3943 } 3944 } 3945 3946 Solaris::signal_sets_init(); 3947 Solaris::init_signal_mem(); 3948 Solaris::install_signal_handlers(); 3949 // Initialize data for jdk.internal.misc.Signal 3950 if (!ReduceSignalUsage) { 3951 jdk_misc_signal_init(); 3952 } 3953 3954 // initialize synchronization primitives to use either thread or 3955 // lwp synchronization (controlled by UseLWPSynchronization) 3956 Solaris::synchronization_init(); 3957 DEBUG_ONLY(os::set_mutex_init_done();) 3958 3959 if (MaxFDLimit) { 3960 // set the number of file descriptors to max. print out error 3961 // if getrlimit/setrlimit fails but continue regardless. 3962 struct rlimit nbr_files; 3963 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 3964 if (status != 0) { 3965 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno)); 3966 } else { 3967 nbr_files.rlim_cur = nbr_files.rlim_max; 3968 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 3969 if (status != 0) { 3970 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno)); 3971 } 3972 } 3973 } 3974 3975 // Calculate theoretical max. size of Threads to guard gainst 3976 // artifical out-of-memory situations, where all available address- 3977 // space has been reserved by thread stacks. Default stack size is 1Mb. 3978 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ? 3979 JavaThread::stack_size_at_create() : (1*K*K); 3980 assert(pre_thread_stack_size != 0, "Must have a stack"); 3981 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when 3982 // we should start doing Virtual Memory banging. Currently when the threads will 3983 // have used all but 200Mb of space. 3984 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K); 3985 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size; 3986 3987 // at-exit methods are called in the reverse order of their registration. 3988 // In Solaris 7 and earlier, atexit functions are called on return from 3989 // main or as a result of a call to exit(3C). There can be only 32 of 3990 // these functions registered and atexit() does not set errno. In Solaris 3991 // 8 and later, there is no limit to the number of functions registered 3992 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit 3993 // functions are called upon dlclose(3DL) in addition to return from main 3994 // and exit(3C). 3995 3996 if (PerfAllowAtExitRegistration) { 3997 // only register atexit functions if PerfAllowAtExitRegistration is set. 3998 // atexit functions can be delayed until process exit time, which 3999 // can be problematic for embedded VM situations. Embedded VMs should 4000 // call DestroyJavaVM() to assure that VM resources are released. 4001 4002 // note: perfMemory_exit_helper atexit function may be removed in 4003 // the future if the appropriate cleanup code can be added to the 4004 // VM_Exit VMOperation's doit method. 4005 if (atexit(perfMemory_exit_helper) != 0) { 4006 warning("os::init2 atexit(perfMemory_exit_helper) failed"); 4007 } 4008 } 4009 4010 // Init pset_loadavg function pointer 4011 init_pset_getloadavg_ptr(); 4012 4013 // Shared Posix initialization 4014 os::Posix::init_2(); 4015 4016 return JNI_OK; 4017 } 4018 4019 // Mark the polling page as unreadable 4020 void os::make_polling_page_unreadable(void) { 4021 Events::log(NULL, "Protecting polling page " INTPTR_FORMAT " with PROT_NONE", p2i(_polling_page)); 4022 if (mprotect((char *)_polling_page, page_size, PROT_NONE) != 0) { 4023 fatal("Could not disable polling page"); 4024 } 4025 } 4026 4027 // Mark the polling page as readable 4028 void os::make_polling_page_readable(void) { 4029 Events::log(NULL, "Protecting polling page " INTPTR_FORMAT " with PROT_READ", p2i(_polling_page)); 4030 if (mprotect((char *)_polling_page, page_size, PROT_READ) != 0) { 4031 fatal("Could not enable polling page"); 4032 } 4033 } 4034 4035 // Is a (classpath) directory empty? 4036 bool os::dir_is_empty(const char* path) { 4037 DIR *dir = NULL; 4038 struct dirent *ptr; 4039 4040 dir = opendir(path); 4041 if (dir == NULL) return true; 4042 4043 // Scan the directory 4044 bool result = true; 4045 while (result && (ptr = readdir(dir)) != NULL) { 4046 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 4047 result = false; 4048 } 4049 } 4050 closedir(dir); 4051 return result; 4052 } 4053 4054 // This code originates from JDK's sysOpen and open64_w 4055 // from src/solaris/hpi/src/system_md.c 4056 4057 int os::open(const char *path, int oflag, int mode) { 4058 if (strlen(path) > MAX_PATH - 1) { 4059 errno = ENAMETOOLONG; 4060 return -1; 4061 } 4062 int fd; 4063 4064 fd = ::open64(path, oflag, mode); 4065 if (fd == -1) return -1; 4066 4067 // If the open succeeded, the file might still be a directory 4068 { 4069 struct stat64 buf64; 4070 int ret = ::fstat64(fd, &buf64); 4071 int st_mode = buf64.st_mode; 4072 4073 if (ret != -1) { 4074 if ((st_mode & S_IFMT) == S_IFDIR) { 4075 errno = EISDIR; 4076 ::close(fd); 4077 return -1; 4078 } 4079 } else { 4080 ::close(fd); 4081 return -1; 4082 } 4083 } 4084 4085 // 32-bit Solaris systems suffer from: 4086 // 4087 // - an historical default soft limit of 256 per-process file 4088 // descriptors that is too low for many Java programs. 4089 // 4090 // - a design flaw where file descriptors created using stdio 4091 // fopen must be less than 256, _even_ when the first limit above 4092 // has been raised. This can cause calls to fopen (but not calls to 4093 // open, for example) to fail mysteriously, perhaps in 3rd party 4094 // native code (although the JDK itself uses fopen). One can hardly 4095 // criticize them for using this most standard of all functions. 4096 // 4097 // We attempt to make everything work anyways by: 4098 // 4099 // - raising the soft limit on per-process file descriptors beyond 4100 // 256 4101 // 4102 // - As of Solaris 10u4, we can request that Solaris raise the 256 4103 // stdio fopen limit by calling function enable_extended_FILE_stdio. 4104 // This is done in init_2 and recorded in enabled_extended_FILE_stdio 4105 // 4106 // - If we are stuck on an old (pre 10u4) Solaris system, we can 4107 // workaround the bug by remapping non-stdio file descriptors below 4108 // 256 to ones beyond 256, which is done below. 4109 // 4110 // See: 4111 // 1085341: 32-bit stdio routines should support file descriptors >255 4112 // 6533291: Work around 32-bit Solaris stdio limit of 256 open files 4113 // 6431278: Netbeans crash on 32 bit Solaris: need to call 4114 // enable_extended_FILE_stdio() in VM initialisation 4115 // Giri Mandalika's blog 4116 // http://technopark02.blogspot.com/2005_05_01_archive.html 4117 // 4118 #ifndef _LP64 4119 if ((!enabled_extended_FILE_stdio) && fd < 256) { 4120 int newfd = ::fcntl(fd, F_DUPFD, 256); 4121 if (newfd != -1) { 4122 ::close(fd); 4123 fd = newfd; 4124 } 4125 } 4126 #endif // 32-bit Solaris 4127 4128 // All file descriptors that are opened in the JVM and not 4129 // specifically destined for a subprocess should have the 4130 // close-on-exec flag set. If we don't set it, then careless 3rd 4131 // party native code might fork and exec without closing all 4132 // appropriate file descriptors (e.g. as we do in closeDescriptors in 4133 // UNIXProcess.c), and this in turn might: 4134 // 4135 // - cause end-of-file to fail to be detected on some file 4136 // descriptors, resulting in mysterious hangs, or 4137 // 4138 // - might cause an fopen in the subprocess to fail on a system 4139 // suffering from bug 1085341. 4140 // 4141 // (Yes, the default setting of the close-on-exec flag is a Unix 4142 // design flaw) 4143 // 4144 // See: 4145 // 1085341: 32-bit stdio routines should support file descriptors >255 4146 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed 4147 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 4148 // 4149 #ifdef FD_CLOEXEC 4150 { 4151 int flags = ::fcntl(fd, F_GETFD); 4152 if (flags != -1) { 4153 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); 4154 } 4155 } 4156 #endif 4157 4158 return fd; 4159 } 4160 4161 // create binary file, rewriting existing file if required 4162 int os::create_binary_file(const char* path, bool rewrite_existing) { 4163 int oflags = O_WRONLY | O_CREAT; 4164 if (!rewrite_existing) { 4165 oflags |= O_EXCL; 4166 } 4167 return ::open64(path, oflags, S_IREAD | S_IWRITE); 4168 } 4169 4170 // return current position of file pointer 4171 jlong os::current_file_offset(int fd) { 4172 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR); 4173 } 4174 4175 // move file pointer to the specified offset 4176 jlong os::seek_to_file_offset(int fd, jlong offset) { 4177 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET); 4178 } 4179 4180 jlong os::lseek(int fd, jlong offset, int whence) { 4181 return (jlong) ::lseek64(fd, offset, whence); 4182 } 4183 4184 int os::ftruncate(int fd, jlong length) { 4185 return ::ftruncate64(fd, length); 4186 } 4187 4188 int os::fsync(int fd) { 4189 RESTARTABLE_RETURN_INT(::fsync(fd)); 4190 } 4191 4192 int os::available(int fd, jlong *bytes) { 4193 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 4194 "Assumed _thread_in_native"); 4195 jlong cur, end; 4196 int mode; 4197 struct stat64 buf64; 4198 4199 if (::fstat64(fd, &buf64) >= 0) { 4200 mode = buf64.st_mode; 4201 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 4202 int n,ioctl_return; 4203 4204 RESTARTABLE(::ioctl(fd, FIONREAD, &n), ioctl_return); 4205 if (ioctl_return>= 0) { 4206 *bytes = n; 4207 return 1; 4208 } 4209 } 4210 } 4211 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) { 4212 return 0; 4213 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) { 4214 return 0; 4215 } else if (::lseek64(fd, cur, SEEK_SET) == -1) { 4216 return 0; 4217 } 4218 *bytes = end - cur; 4219 return 1; 4220 } 4221 4222 // Map a block of memory. 4223 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 4224 char *addr, size_t bytes, bool read_only, 4225 bool allow_exec) { 4226 int prot; 4227 int flags; 4228 4229 if (read_only) { 4230 prot = PROT_READ; 4231 flags = MAP_SHARED; 4232 } else { 4233 prot = PROT_READ | PROT_WRITE; 4234 flags = MAP_PRIVATE; 4235 } 4236 4237 if (allow_exec) { 4238 prot |= PROT_EXEC; 4239 } 4240 4241 if (addr != NULL) { 4242 flags |= MAP_FIXED; 4243 } 4244 4245 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, 4246 fd, file_offset); 4247 if (mapped_address == MAP_FAILED) { 4248 return NULL; 4249 } 4250 return mapped_address; 4251 } 4252 4253 4254 // Remap a block of memory. 4255 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 4256 char *addr, size_t bytes, bool read_only, 4257 bool allow_exec) { 4258 // same as map_memory() on this OS 4259 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 4260 allow_exec); 4261 } 4262 4263 4264 // Unmap a block of memory. 4265 bool os::pd_unmap_memory(char* addr, size_t bytes) { 4266 return munmap(addr, bytes) == 0; 4267 } 4268 4269 void os::pause() { 4270 char filename[MAX_PATH]; 4271 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 4272 jio_snprintf(filename, MAX_PATH, "%s", PauseAtStartupFile); 4273 } else { 4274 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 4275 } 4276 4277 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 4278 if (fd != -1) { 4279 struct stat buf; 4280 ::close(fd); 4281 while (::stat(filename, &buf) == 0) { 4282 (void)::poll(NULL, 0, 100); 4283 } 4284 } else { 4285 jio_fprintf(stderr, 4286 "Could not open pause file '%s', continuing immediately.\n", filename); 4287 } 4288 } 4289 4290 #ifndef PRODUCT 4291 #ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS 4292 // Turn this on if you need to trace synch operations. 4293 // Set RECORD_SYNCH_LIMIT to a large-enough value, 4294 // and call record_synch_enable and record_synch_disable 4295 // around the computation of interest. 4296 4297 void record_synch(char* name, bool returning); // defined below 4298 4299 class RecordSynch { 4300 char* _name; 4301 public: 4302 RecordSynch(char* name) :_name(name) { record_synch(_name, false); } 4303 ~RecordSynch() { record_synch(_name, true); } 4304 }; 4305 4306 #define CHECK_SYNCH_OP(ret, name, params, args, inner) \ 4307 extern "C" ret name params { \ 4308 typedef ret name##_t params; \ 4309 static name##_t* implem = NULL; \ 4310 static int callcount = 0; \ 4311 if (implem == NULL) { \ 4312 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \ 4313 if (implem == NULL) fatal(dlerror()); \ 4314 } \ 4315 ++callcount; \ 4316 RecordSynch _rs(#name); \ 4317 inner; \ 4318 return implem args; \ 4319 } 4320 // in dbx, examine callcounts this way: 4321 // for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done 4322 4323 #define CHECK_POINTER_OK(p) \ 4324 (!Universe::is_fully_initialized() || !Universe::is_reserved_heap((oop)(p))) 4325 #define CHECK_MU \ 4326 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only."); 4327 #define CHECK_CV \ 4328 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only."); 4329 #define CHECK_P(p) \ 4330 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only."); 4331 4332 #define CHECK_MUTEX(mutex_op) \ 4333 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU); 4334 4335 CHECK_MUTEX( mutex_lock) 4336 CHECK_MUTEX( _mutex_lock) 4337 CHECK_MUTEX( mutex_unlock) 4338 CHECK_MUTEX(_mutex_unlock) 4339 CHECK_MUTEX( mutex_trylock) 4340 CHECK_MUTEX(_mutex_trylock) 4341 4342 #define CHECK_COND(cond_op) \ 4343 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU; CHECK_CV); 4344 4345 CHECK_COND( cond_wait); 4346 CHECK_COND(_cond_wait); 4347 CHECK_COND(_cond_wait_cancel); 4348 4349 #define CHECK_COND2(cond_op) \ 4350 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU; CHECK_CV); 4351 4352 CHECK_COND2( cond_timedwait); 4353 CHECK_COND2(_cond_timedwait); 4354 CHECK_COND2(_cond_timedwait_cancel); 4355 4356 // do the _lwp_* versions too 4357 #define mutex_t lwp_mutex_t 4358 #define cond_t lwp_cond_t 4359 CHECK_MUTEX( _lwp_mutex_lock) 4360 CHECK_MUTEX( _lwp_mutex_unlock) 4361 CHECK_MUTEX( _lwp_mutex_trylock) 4362 CHECK_MUTEX( __lwp_mutex_lock) 4363 CHECK_MUTEX( __lwp_mutex_unlock) 4364 CHECK_MUTEX( __lwp_mutex_trylock) 4365 CHECK_MUTEX(___lwp_mutex_lock) 4366 CHECK_MUTEX(___lwp_mutex_unlock) 4367 4368 CHECK_COND( _lwp_cond_wait); 4369 CHECK_COND( __lwp_cond_wait); 4370 CHECK_COND(___lwp_cond_wait); 4371 4372 CHECK_COND2( _lwp_cond_timedwait); 4373 CHECK_COND2( __lwp_cond_timedwait); 4374 #undef mutex_t 4375 #undef cond_t 4376 4377 CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0); 4378 CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0); 4379 CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0); 4380 CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0); 4381 CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p)); 4382 CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p)); 4383 CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV); 4384 CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV); 4385 4386 4387 // recording machinery: 4388 4389 enum { RECORD_SYNCH_LIMIT = 200 }; 4390 char* record_synch_name[RECORD_SYNCH_LIMIT]; 4391 void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT]; 4392 bool record_synch_returning[RECORD_SYNCH_LIMIT]; 4393 thread_t record_synch_thread[RECORD_SYNCH_LIMIT]; 4394 int record_synch_count = 0; 4395 bool record_synch_enabled = false; 4396 4397 // in dbx, examine recorded data this way: 4398 // for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done 4399 4400 void record_synch(char* name, bool returning) { 4401 if (record_synch_enabled) { 4402 if (record_synch_count < RECORD_SYNCH_LIMIT) { 4403 record_synch_name[record_synch_count] = name; 4404 record_synch_returning[record_synch_count] = returning; 4405 record_synch_thread[record_synch_count] = thr_self(); 4406 record_synch_arg0ptr[record_synch_count] = &name; 4407 record_synch_count++; 4408 } 4409 // put more checking code here: 4410 // ... 4411 } 4412 } 4413 4414 void record_synch_enable() { 4415 // start collecting trace data, if not already doing so 4416 if (!record_synch_enabled) record_synch_count = 0; 4417 record_synch_enabled = true; 4418 } 4419 4420 void record_synch_disable() { 4421 // stop collecting trace data 4422 record_synch_enabled = false; 4423 } 4424 4425 #endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS 4426 #endif // PRODUCT 4427 4428 const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime); 4429 const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) - 4430 (intptr_t)(&((prusage_t *)(NULL))->pr_utime); 4431 4432 4433 // JVMTI & JVM monitoring and management support 4434 // The thread_cpu_time() and current_thread_cpu_time() are only 4435 // supported if is_thread_cpu_time_supported() returns true. 4436 // They are not supported on Solaris T1. 4437 4438 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 4439 // are used by JVM M&M and JVMTI to get user+sys or user CPU time 4440 // of a thread. 4441 // 4442 // current_thread_cpu_time() and thread_cpu_time(Thread *) 4443 // returns the fast estimate available on the platform. 4444 4445 // hrtime_t gethrvtime() return value includes 4446 // user time but does not include system time 4447 jlong os::current_thread_cpu_time() { 4448 return (jlong) gethrvtime(); 4449 } 4450 4451 jlong os::thread_cpu_time(Thread *thread) { 4452 // return user level CPU time only to be consistent with 4453 // what current_thread_cpu_time returns. 4454 // thread_cpu_time_info() must be changed if this changes 4455 return os::thread_cpu_time(thread, false /* user time only */); 4456 } 4457 4458 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 4459 if (user_sys_cpu_time) { 4460 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 4461 } else { 4462 return os::current_thread_cpu_time(); 4463 } 4464 } 4465 4466 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 4467 char proc_name[64]; 4468 int count; 4469 prusage_t prusage; 4470 jlong lwp_time; 4471 int fd; 4472 4473 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage", 4474 getpid(), 4475 thread->osthread()->lwp_id()); 4476 fd = ::open(proc_name, O_RDONLY); 4477 if (fd == -1) return -1; 4478 4479 do { 4480 count = ::pread(fd, 4481 (void *)&prusage.pr_utime, 4482 thr_time_size, 4483 thr_time_off); 4484 } while (count < 0 && errno == EINTR); 4485 ::close(fd); 4486 if (count < 0) return -1; 4487 4488 if (user_sys_cpu_time) { 4489 // user + system CPU time 4490 lwp_time = (((jlong)prusage.pr_stime.tv_sec + 4491 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) + 4492 (jlong)prusage.pr_stime.tv_nsec + 4493 (jlong)prusage.pr_utime.tv_nsec; 4494 } else { 4495 // user level CPU time only 4496 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) + 4497 (jlong)prusage.pr_utime.tv_nsec; 4498 } 4499 4500 return (lwp_time); 4501 } 4502 4503 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4504 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 4505 info_ptr->may_skip_backward = false; // elapsed time not wall time 4506 info_ptr->may_skip_forward = false; // elapsed time not wall time 4507 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned 4508 } 4509 4510 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4511 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 4512 info_ptr->may_skip_backward = false; // elapsed time not wall time 4513 info_ptr->may_skip_forward = false; // elapsed time not wall time 4514 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned 4515 } 4516 4517 bool os::is_thread_cpu_time_supported() { 4518 return true; 4519 } 4520 4521 // System loadavg support. Returns -1 if load average cannot be obtained. 4522 // Return the load average for our processor set if the primitive exists 4523 // (Solaris 9 and later). Otherwise just return system wide loadavg. 4524 int os::loadavg(double loadavg[], int nelem) { 4525 if (pset_getloadavg_ptr != NULL) { 4526 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem); 4527 } else { 4528 return ::getloadavg(loadavg, nelem); 4529 } 4530 } 4531 4532 //--------------------------------------------------------------------------------- 4533 4534 bool os::find(address addr, outputStream* st) { 4535 Dl_info dlinfo; 4536 memset(&dlinfo, 0, sizeof(dlinfo)); 4537 if (dladdr(addr, &dlinfo) != 0) { 4538 st->print(PTR_FORMAT ": ", addr); 4539 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) { 4540 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr); 4541 } else if (dlinfo.dli_fbase != NULL) { 4542 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase); 4543 } else { 4544 st->print("<absolute address>"); 4545 } 4546 if (dlinfo.dli_fname != NULL) { 4547 st->print(" in %s", dlinfo.dli_fname); 4548 } 4549 if (dlinfo.dli_fbase != NULL) { 4550 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); 4551 } 4552 st->cr(); 4553 4554 if (Verbose) { 4555 // decode some bytes around the PC 4556 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size()); 4557 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); 4558 address lowest = (address) dlinfo.dli_sname; 4559 if (!lowest) lowest = (address) dlinfo.dli_fbase; 4560 if (begin < lowest) begin = lowest; 4561 Dl_info dlinfo2; 4562 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr 4563 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) { 4564 end = (address) dlinfo2.dli_saddr; 4565 } 4566 Disassembler::decode(begin, end, st); 4567 } 4568 return true; 4569 } 4570 return false; 4571 } 4572 4573 // Following function has been added to support HotSparc's libjvm.so running 4574 // under Solaris production JDK 1.2.2 / 1.3.0. These came from 4575 // src/solaris/hpi/native_threads in the EVM codebase. 4576 // 4577 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release 4578 // libraries and should thus be removed. We will leave it behind for a while 4579 // until we no longer want to able to run on top of 1.3.0 Solaris production 4580 // JDK. See 4341971. 4581 4582 #define STACK_SLACK 0x800 4583 4584 extern "C" { 4585 intptr_t sysThreadAvailableStackWithSlack() { 4586 stack_t st; 4587 intptr_t retval, stack_top; 4588 retval = thr_stksegment(&st); 4589 assert(retval == 0, "incorrect return value from thr_stksegment"); 4590 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned"); 4591 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned"); 4592 stack_top=(intptr_t)st.ss_sp-st.ss_size; 4593 return ((intptr_t)&stack_top - stack_top - STACK_SLACK); 4594 } 4595 } 4596 4597 // ObjectMonitor park-unpark infrastructure ... 4598 // 4599 // We implement Solaris and Linux PlatformEvents with the 4600 // obvious condvar-mutex-flag triple. 4601 // Another alternative that works quite well is pipes: 4602 // Each PlatformEvent consists of a pipe-pair. 4603 // The thread associated with the PlatformEvent 4604 // calls park(), which reads from the input end of the pipe. 4605 // Unpark() writes into the other end of the pipe. 4606 // The write-side of the pipe must be set NDELAY. 4607 // Unfortunately pipes consume a large # of handles. 4608 // Native solaris lwp_park() and lwp_unpark() work nicely, too. 4609 // Using pipes for the 1st few threads might be workable, however. 4610 // 4611 // park() is permitted to return spuriously. 4612 // Callers of park() should wrap the call to park() in 4613 // an appropriate loop. A litmus test for the correct 4614 // usage of park is the following: if park() were modified 4615 // to immediately return 0 your code should still work, 4616 // albeit degenerating to a spin loop. 4617 // 4618 // In a sense, park()-unpark() just provides more polite spinning 4619 // and polling with the key difference over naive spinning being 4620 // that a parked thread needs to be explicitly unparked() in order 4621 // to wake up and to poll the underlying condition. 4622 // 4623 // Assumption: 4624 // Only one parker can exist on an event, which is why we allocate 4625 // them per-thread. Multiple unparkers can coexist. 4626 // 4627 // _Event transitions in park() 4628 // -1 => -1 : illegal 4629 // 1 => 0 : pass - return immediately 4630 // 0 => -1 : block; then set _Event to 0 before returning 4631 // 4632 // _Event transitions in unpark() 4633 // 0 => 1 : just return 4634 // 1 => 1 : just return 4635 // -1 => either 0 or 1; must signal target thread 4636 // That is, we can safely transition _Event from -1 to either 4637 // 0 or 1. 4638 // 4639 // _Event serves as a restricted-range semaphore. 4640 // -1 : thread is blocked, i.e. there is a waiter 4641 // 0 : neutral: thread is running or ready, 4642 // could have been signaled after a wait started 4643 // 1 : signaled - thread is running or ready 4644 // 4645 // Another possible encoding of _Event would be with 4646 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits. 4647 // 4648 // TODO-FIXME: add DTRACE probes for: 4649 // 1. Tx parks 4650 // 2. Ty unparks Tx 4651 // 3. Tx resumes from park 4652 4653 4654 // value determined through experimentation 4655 #define ROUNDINGFIX 11 4656 4657 // utility to compute the abstime argument to timedwait. 4658 // TODO-FIXME: switch from compute_abstime() to unpackTime(). 4659 4660 static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) { 4661 // millis is the relative timeout time 4662 // abstime will be the absolute timeout time 4663 if (millis < 0) millis = 0; 4664 struct timeval now; 4665 int status = gettimeofday(&now, NULL); 4666 assert(status == 0, "gettimeofday"); 4667 jlong seconds = millis / 1000; 4668 jlong max_wait_period; 4669 4670 if (UseLWPSynchronization) { 4671 // forward port of fix for 4275818 (not sleeping long enough) 4672 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where 4673 // _lwp_cond_timedwait() used a round_down algorithm rather 4674 // than a round_up. For millis less than our roundfactor 4675 // it rounded down to 0 which doesn't meet the spec. 4676 // For millis > roundfactor we may return a bit sooner, but 4677 // since we can not accurately identify the patch level and 4678 // this has already been fixed in Solaris 9 and 8 we will 4679 // leave it alone rather than always rounding down. 4680 4681 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX; 4682 // It appears that when we go directly through Solaris _lwp_cond_timedwait() 4683 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6 4684 max_wait_period = 21000000; 4685 } else { 4686 max_wait_period = 50000000; 4687 } 4688 millis %= 1000; 4689 if (seconds > max_wait_period) { // see man cond_timedwait(3T) 4690 seconds = max_wait_period; 4691 } 4692 abstime->tv_sec = now.tv_sec + seconds; 4693 long usec = now.tv_usec + millis * 1000; 4694 if (usec >= 1000000) { 4695 abstime->tv_sec += 1; 4696 usec -= 1000000; 4697 } 4698 abstime->tv_nsec = usec * 1000; 4699 return abstime; 4700 } 4701 4702 void os::PlatformEvent::park() { // AKA: down() 4703 // Transitions for _Event: 4704 // -1 => -1 : illegal 4705 // 1 => 0 : pass - return immediately 4706 // 0 => -1 : block; then set _Event to 0 before returning 4707 4708 // Invariant: Only the thread associated with the Event/PlatformEvent 4709 // may call park(). 4710 assert(_nParked == 0, "invariant"); 4711 4712 int v; 4713 for (;;) { 4714 v = _Event; 4715 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 4716 } 4717 guarantee(v >= 0, "invariant"); 4718 if (v == 0) { 4719 // Do this the hard way by blocking ... 4720 // See http://monaco.sfbay/detail.jsf?cr=5094058. 4721 int status = os::Solaris::mutex_lock(_mutex); 4722 assert_status(status == 0, status, "mutex_lock"); 4723 guarantee(_nParked == 0, "invariant"); 4724 ++_nParked; 4725 while (_Event < 0) { 4726 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... 4727 // Treat this the same as if the wait was interrupted 4728 // With usr/lib/lwp going to kernel, always handle ETIME 4729 status = os::Solaris::cond_wait(_cond, _mutex); 4730 if (status == ETIME) status = EINTR; 4731 assert_status(status == 0 || status == EINTR, status, "cond_wait"); 4732 } 4733 --_nParked; 4734 _Event = 0; 4735 status = os::Solaris::mutex_unlock(_mutex); 4736 assert_status(status == 0, status, "mutex_unlock"); 4737 // Paranoia to ensure our locked and lock-free paths interact 4738 // correctly with each other. 4739 OrderAccess::fence(); 4740 } 4741 } 4742 4743 int os::PlatformEvent::park(jlong millis) { 4744 // Transitions for _Event: 4745 // -1 => -1 : illegal 4746 // 1 => 0 : pass - return immediately 4747 // 0 => -1 : block; then set _Event to 0 before returning 4748 4749 guarantee(_nParked == 0, "invariant"); 4750 int v; 4751 for (;;) { 4752 v = _Event; 4753 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 4754 } 4755 guarantee(v >= 0, "invariant"); 4756 if (v != 0) return OS_OK; 4757 4758 int ret = OS_TIMEOUT; 4759 timestruc_t abst; 4760 compute_abstime(&abst, millis); 4761 4762 // See http://monaco.sfbay/detail.jsf?cr=5094058. 4763 int status = os::Solaris::mutex_lock(_mutex); 4764 assert_status(status == 0, status, "mutex_lock"); 4765 guarantee(_nParked == 0, "invariant"); 4766 ++_nParked; 4767 while (_Event < 0) { 4768 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst); 4769 assert_status(status == 0 || status == EINTR || 4770 status == ETIME || status == ETIMEDOUT, 4771 status, "cond_timedwait"); 4772 if (!FilterSpuriousWakeups) break; // previous semantics 4773 if (status == ETIME || status == ETIMEDOUT) break; 4774 // We consume and ignore EINTR and spurious wakeups. 4775 } 4776 --_nParked; 4777 if (_Event >= 0) ret = OS_OK; 4778 _Event = 0; 4779 status = os::Solaris::mutex_unlock(_mutex); 4780 assert_status(status == 0, status, "mutex_unlock"); 4781 // Paranoia to ensure our locked and lock-free paths interact 4782 // correctly with each other. 4783 OrderAccess::fence(); 4784 return ret; 4785 } 4786 4787 void os::PlatformEvent::unpark() { 4788 // Transitions for _Event: 4789 // 0 => 1 : just return 4790 // 1 => 1 : just return 4791 // -1 => either 0 or 1; must signal target thread 4792 // That is, we can safely transition _Event from -1 to either 4793 // 0 or 1. 4794 // See also: "Semaphores in Plan 9" by Mullender & Cox 4795 // 4796 // Note: Forcing a transition from "-1" to "1" on an unpark() means 4797 // that it will take two back-to-back park() calls for the owning 4798 // thread to block. This has the benefit of forcing a spurious return 4799 // from the first park() call after an unpark() call which will help 4800 // shake out uses of park() and unpark() without condition variables. 4801 4802 if (Atomic::xchg(1, &_Event) >= 0) return; 4803 4804 // If the thread associated with the event was parked, wake it. 4805 // Wait for the thread assoc with the PlatformEvent to vacate. 4806 int status = os::Solaris::mutex_lock(_mutex); 4807 assert_status(status == 0, status, "mutex_lock"); 4808 int AnyWaiters = _nParked; 4809 status = os::Solaris::mutex_unlock(_mutex); 4810 assert_status(status == 0, status, "mutex_unlock"); 4811 guarantee(AnyWaiters == 0 || AnyWaiters == 1, "invariant"); 4812 if (AnyWaiters != 0) { 4813 // Note that we signal() *after* dropping the lock for "immortal" Events. 4814 // This is safe and avoids a common class of futile wakeups. In rare 4815 // circumstances this can cause a thread to return prematurely from 4816 // cond_{timed}wait() but the spurious wakeup is benign and the victim 4817 // will simply re-test the condition and re-park itself. 4818 // This provides particular benefit if the underlying platform does not 4819 // provide wait morphing. 4820 status = os::Solaris::cond_signal(_cond); 4821 assert_status(status == 0, status, "cond_signal"); 4822 } 4823 } 4824 4825 // JSR166 4826 // ------------------------------------------------------- 4827 4828 // The solaris and linux implementations of park/unpark are fairly 4829 // conservative for now, but can be improved. They currently use a 4830 // mutex/condvar pair, plus _counter. 4831 // Park decrements _counter if > 0, else does a condvar wait. Unpark 4832 // sets count to 1 and signals condvar. Only one thread ever waits 4833 // on the condvar. Contention seen when trying to park implies that someone 4834 // is unparking you, so don't wait. And spurious returns are fine, so there 4835 // is no need to track notifications. 4836 4837 #define MAX_SECS 100000000 4838 4839 // This code is common to linux and solaris and will be moved to a 4840 // common place in dolphin. 4841 // 4842 // The passed in time value is either a relative time in nanoseconds 4843 // or an absolute time in milliseconds. Either way it has to be unpacked 4844 // into suitable seconds and nanoseconds components and stored in the 4845 // given timespec structure. 4846 // Given time is a 64-bit value and the time_t used in the timespec is only 4847 // a signed-32-bit value (except on 64-bit Linux) we have to watch for 4848 // overflow if times way in the future are given. Further on Solaris versions 4849 // prior to 10 there is a restriction (see cond_timedwait) that the specified 4850 // number of seconds, in abstime, is less than current_time + 100,000,000. 4851 // As it will be 28 years before "now + 100000000" will overflow we can 4852 // ignore overflow and just impose a hard-limit on seconds using the value 4853 // of "now + 100,000,000". This places a limit on the timeout of about 3.17 4854 // years from "now". 4855 // 4856 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) { 4857 assert(time > 0, "convertTime"); 4858 4859 struct timeval now; 4860 int status = gettimeofday(&now, NULL); 4861 assert(status == 0, "gettimeofday"); 4862 4863 time_t max_secs = now.tv_sec + MAX_SECS; 4864 4865 if (isAbsolute) { 4866 jlong secs = time / 1000; 4867 if (secs > max_secs) { 4868 absTime->tv_sec = max_secs; 4869 } else { 4870 absTime->tv_sec = secs; 4871 } 4872 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; 4873 } else { 4874 jlong secs = time / NANOSECS_PER_SEC; 4875 if (secs >= MAX_SECS) { 4876 absTime->tv_sec = max_secs; 4877 absTime->tv_nsec = 0; 4878 } else { 4879 absTime->tv_sec = now.tv_sec + secs; 4880 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; 4881 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { 4882 absTime->tv_nsec -= NANOSECS_PER_SEC; 4883 ++absTime->tv_sec; // note: this must be <= max_secs 4884 } 4885 } 4886 } 4887 assert(absTime->tv_sec >= 0, "tv_sec < 0"); 4888 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); 4889 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); 4890 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); 4891 } 4892 4893 void Parker::park(bool isAbsolute, jlong time) { 4894 // Ideally we'd do something useful while spinning, such 4895 // as calling unpackTime(). 4896 4897 // Optional fast-path check: 4898 // Return immediately if a permit is available. 4899 // We depend on Atomic::xchg() having full barrier semantics 4900 // since we are doing a lock-free update to _counter. 4901 if (Atomic::xchg(0, &_counter) > 0) return; 4902 4903 // Optional fast-exit: Check interrupt before trying to wait 4904 Thread* thread = Thread::current(); 4905 assert(thread->is_Java_thread(), "Must be JavaThread"); 4906 JavaThread *jt = (JavaThread *)thread; 4907 if (jt->is_interrupted(false)) { 4908 return; 4909 } 4910 4911 // First, demultiplex/decode time arguments 4912 timespec absTime; 4913 if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all 4914 return; 4915 } 4916 if (time > 0) { 4917 // Warning: this code might be exposed to the old Solaris time 4918 // round-down bugs. Grep "roundingFix" for details. 4919 unpackTime(&absTime, isAbsolute, time); 4920 } 4921 4922 // Enter safepoint region 4923 // Beware of deadlocks such as 6317397. 4924 // The per-thread Parker:: _mutex is a classic leaf-lock. 4925 // In particular a thread must never block on the Threads_lock while 4926 // holding the Parker:: mutex. If safepoints are pending both the 4927 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. 4928 ThreadBlockInVM tbivm(jt); 4929 4930 // Can't access interrupt state now that we are _thread_blocked. If we've 4931 // been interrupted since we checked above then _counter will be > 0. 4932 4933 // Don't wait if cannot get lock since interference arises from 4934 // unblocking. 4935 if (os::Solaris::mutex_trylock(_mutex) != 0) { 4936 return; 4937 } 4938 4939 int status; 4940 4941 if (_counter > 0) { // no wait needed 4942 _counter = 0; 4943 status = os::Solaris::mutex_unlock(_mutex); 4944 assert(status == 0, "invariant"); 4945 // Paranoia to ensure our locked and lock-free paths interact 4946 // correctly with each other and Java-level accesses. 4947 OrderAccess::fence(); 4948 return; 4949 } 4950 4951 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 4952 jt->set_suspend_equivalent(); 4953 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 4954 4955 // Do this the hard way by blocking ... 4956 // See http://monaco.sfbay/detail.jsf?cr=5094058. 4957 if (time == 0) { 4958 status = os::Solaris::cond_wait(_cond, _mutex); 4959 } else { 4960 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime); 4961 } 4962 // Note that an untimed cond_wait() can sometimes return ETIME on older 4963 // versions of the Solaris. 4964 assert_status(status == 0 || status == EINTR || 4965 status == ETIME || status == ETIMEDOUT, 4966 status, "cond_timedwait"); 4967 4968 _counter = 0; 4969 status = os::Solaris::mutex_unlock(_mutex); 4970 assert_status(status == 0, status, "mutex_unlock"); 4971 // Paranoia to ensure our locked and lock-free paths interact 4972 // correctly with each other and Java-level accesses. 4973 OrderAccess::fence(); 4974 4975 // If externally suspended while waiting, re-suspend 4976 if (jt->handle_special_suspend_equivalent_condition()) { 4977 jt->java_suspend_self(); 4978 } 4979 } 4980 4981 void Parker::unpark() { 4982 int status = os::Solaris::mutex_lock(_mutex); 4983 assert(status == 0, "invariant"); 4984 const int s = _counter; 4985 _counter = 1; 4986 status = os::Solaris::mutex_unlock(_mutex); 4987 assert(status == 0, "invariant"); 4988 4989 if (s < 1) { 4990 status = os::Solaris::cond_signal(_cond); 4991 assert(status == 0, "invariant"); 4992 } 4993 } 4994 4995 // Platform Mutex/Monitor implementations 4996 4997 os::PlatformMutex::PlatformMutex() { 4998 int status = os::Solaris::mutex_init(&_mutex); 4999 assert_status(status == 0, status, "mutex_init"); 5000 } 5001 5002 os::PlatformMutex::~PlatformMutex() { 5003 int status = os::Solaris::mutex_destroy(&_mutex); 5004 assert_status(status == 0, status, "mutex_destroy"); 5005 } 5006 5007 void os::PlatformMutex::lock() { 5008 int status = os::Solaris::mutex_lock(&_mutex); 5009 assert_status(status == 0, status, "mutex_lock"); 5010 } 5011 5012 void os::PlatformMutex::unlock() { 5013 int status = os::Solaris::mutex_unlock(&_mutex); 5014 assert_status(status == 0, status, "mutex_unlock"); 5015 } 5016 5017 bool os::PlatformMutex::try_lock() { 5018 int status = os::Solaris::mutex_trylock(&_mutex); 5019 assert_status(status == 0 || status == EBUSY, status, "mutex_trylock"); 5020 return status == 0; 5021 } 5022 5023 os::PlatformMonitor::PlatformMonitor() { 5024 int status = os::Solaris::cond_init(&_cond); 5025 assert_status(status == 0, status, "cond_init"); 5026 } 5027 5028 os::PlatformMonitor::~PlatformMonitor() { 5029 int status = os::Solaris::cond_destroy(&_cond); 5030 assert_status(status == 0, status, "cond_destroy"); 5031 } 5032 5033 // Must already be locked 5034 int os::PlatformMonitor::wait(jlong millis) { 5035 assert(millis >= 0, "negative timeout"); 5036 if (millis > 0) { 5037 timestruc_t abst; 5038 int ret = OS_TIMEOUT; 5039 compute_abstime(&abst, millis); 5040 int status = os::Solaris::cond_timedwait(&_cond, &_mutex, &abst); 5041 assert_status(status == 0 || status == EINTR || 5042 status == ETIME || status == ETIMEDOUT, 5043 status, "cond_timedwait"); 5044 // EINTR acts as spurious wakeup - which is permitted anyway 5045 if (status == 0 || status == EINTR) { 5046 ret = OS_OK; 5047 } 5048 return ret; 5049 } else { 5050 int status = os::Solaris::cond_wait(&_cond, &_mutex); 5051 assert_status(status == 0 || status == EINTR, 5052 status, "cond_wait"); 5053 return OS_OK; 5054 } 5055 } 5056 5057 void os::PlatformMonitor::notify() { 5058 int status = os::Solaris::cond_signal(&_cond); 5059 assert_status(status == 0, status, "cond_signal"); 5060 } 5061 5062 void os::PlatformMonitor::notify_all() { 5063 int status = os::Solaris::cond_broadcast(&_cond); 5064 assert_status(status == 0, status, "cond_broadcast"); 5065 } 5066 5067 extern char** environ; 5068 5069 // Run the specified command in a separate process. Return its exit value, 5070 // or -1 on failure (e.g. can't fork a new process). 5071 // Unlike system(), this function can be called from signal handler. It 5072 // doesn't block SIGINT et al. 5073 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) { 5074 char * argv[4]; 5075 argv[0] = (char *)"sh"; 5076 argv[1] = (char *)"-c"; 5077 argv[2] = cmd; 5078 argv[3] = NULL; 5079 5080 // fork is async-safe, fork1 is not so can't use in signal handler 5081 pid_t pid; 5082 Thread* t = Thread::current_or_null_safe(); 5083 if (t != NULL && t->is_inside_signal_handler()) { 5084 pid = fork(); 5085 } else { 5086 pid = fork1(); 5087 } 5088 5089 if (pid < 0) { 5090 // fork failed 5091 warning("fork failed: %s", os::strerror(errno)); 5092 return -1; 5093 5094 } else if (pid == 0) { 5095 // child process 5096 5097 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris 5098 execve("/usr/bin/sh", argv, environ); 5099 5100 // execve failed 5101 _exit(-1); 5102 5103 } else { 5104 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 5105 // care about the actual exit code, for now. 5106 5107 int status; 5108 5109 // Wait for the child process to exit. This returns immediately if 5110 // the child has already exited. */ 5111 while (waitpid(pid, &status, 0) < 0) { 5112 switch (errno) { 5113 case ECHILD: return 0; 5114 case EINTR: break; 5115 default: return -1; 5116 } 5117 } 5118 5119 if (WIFEXITED(status)) { 5120 // The child exited normally; get its exit code. 5121 return WEXITSTATUS(status); 5122 } else if (WIFSIGNALED(status)) { 5123 // The child exited because of a signal 5124 // The best value to return is 0x80 + signal number, 5125 // because that is what all Unix shells do, and because 5126 // it allows callers to distinguish between process exit and 5127 // process death by signal. 5128 return 0x80 + WTERMSIG(status); 5129 } else { 5130 // Unknown exit code; pass it through 5131 return status; 5132 } 5133 } 5134 } 5135 5136 size_t os::write(int fd, const void *buf, unsigned int nBytes) { 5137 size_t res; 5138 RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res); 5139 return res; 5140 } 5141 5142 int os::close(int fd) { 5143 return ::close(fd); 5144 } 5145 5146 int os::socket_close(int fd) { 5147 return ::close(fd); 5148 } 5149 5150 int os::recv(int fd, char* buf, size_t nBytes, uint flags) { 5151 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 5152 "Assumed _thread_in_native"); 5153 RESTARTABLE_RETURN_INT((int)::recv(fd, buf, nBytes, flags)); 5154 } 5155 5156 int os::send(int fd, char* buf, size_t nBytes, uint flags) { 5157 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 5158 "Assumed _thread_in_native"); 5159 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags)); 5160 } 5161 5162 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) { 5163 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags)); 5164 } 5165 5166 // As both poll and select can be interrupted by signals, we have to be 5167 // prepared to restart the system call after updating the timeout, unless 5168 // a poll() is done with timeout == -1, in which case we repeat with this 5169 // "wait forever" value. 5170 5171 int os::connect(int fd, struct sockaddr *him, socklen_t len) { 5172 int _result; 5173 _result = ::connect(fd, him, len); 5174 5175 // On Solaris, when a connect() call is interrupted, the connection 5176 // can be established asynchronously (see 6343810). Subsequent calls 5177 // to connect() must check the errno value which has the semantic 5178 // described below (copied from the connect() man page). Handling 5179 // of asynchronously established connections is required for both 5180 // blocking and non-blocking sockets. 5181 // EINTR The connection attempt was interrupted 5182 // before any data arrived by the delivery of 5183 // a signal. The connection, however, will be 5184 // established asynchronously. 5185 // 5186 // EINPROGRESS The socket is non-blocking, and the connec- 5187 // tion cannot be completed immediately. 5188 // 5189 // EALREADY The socket is non-blocking, and a previous 5190 // connection attempt has not yet been com- 5191 // pleted. 5192 // 5193 // EISCONN The socket is already connected. 5194 if (_result == OS_ERR && errno == EINTR) { 5195 // restarting a connect() changes its errno semantics 5196 RESTARTABLE(::connect(fd, him, len), _result); 5197 // undo these changes 5198 if (_result == OS_ERR) { 5199 if (errno == EALREADY) { 5200 errno = EINPROGRESS; // fall through 5201 } else if (errno == EISCONN) { 5202 errno = 0; 5203 return OS_OK; 5204 } 5205 } 5206 } 5207 return _result; 5208 } 5209 5210 // Get the default path to the core file 5211 // Returns the length of the string 5212 int os::get_core_path(char* buffer, size_t bufferSize) { 5213 const char* p = get_current_directory(buffer, bufferSize); 5214 5215 if (p == NULL) { 5216 assert(p != NULL, "failed to get current directory"); 5217 return 0; 5218 } 5219 5220 jio_snprintf(buffer, bufferSize, "%s/core or core.%d", 5221 p, current_process_id()); 5222 5223 return strlen(buffer); 5224 } 5225 5226 bool os::supports_map_sync() { 5227 return false; 5228 } 5229 5230 #ifndef PRODUCT 5231 void TestReserveMemorySpecial_test() { 5232 // No tests available for this platform 5233 } 5234 #endif 5235 5236 bool os::start_debugging(char *buf, int buflen) { 5237 int len = (int)strlen(buf); 5238 char *p = &buf[len]; 5239 5240 jio_snprintf(p, buflen-len, 5241 "\n\n" 5242 "Do you want to debug the problem?\n\n" 5243 "To debug, run 'dbx - %d'; then switch to thread " INTX_FORMAT "\n" 5244 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n" 5245 "Otherwise, press RETURN to abort...", 5246 os::current_process_id(), os::current_thread_id()); 5247 5248 bool yes = os::message_box("Unexpected Error", buf); 5249 5250 if (yes) { 5251 // yes, user asked VM to launch debugger 5252 jio_snprintf(buf, sizeof(buf), "dbx - %d", os::current_process_id()); 5253 5254 os::fork_and_exec(buf); 5255 yes = false; 5256 } 5257 return yes; 5258 }