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