1 /* 2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 // no precompiled headers 26 #include "classfile/classLoader.hpp" 27 #include "classfile/systemDictionary.hpp" 28 #include "classfile/vmSymbols.hpp" 29 #include "code/icBuffer.hpp" 30 #include "code/vtableStubs.hpp" 31 #include "compiler/compileBroker.hpp" 32 #include "compiler/disassembler.hpp" 33 #include "interpreter/interpreter.hpp" 34 #include "jvm_solaris.h" 35 #include "logging/log.hpp" 36 #include "memory/allocation.inline.hpp" 37 #include "memory/filemap.hpp" 38 #include "oops/oop.inline.hpp" 39 #include "os_share_solaris.hpp" 40 #include "os_solaris.inline.hpp" 41 #include "prims/jniFastGetField.hpp" 42 #include "prims/jvm.h" 43 #include "prims/jvm_misc.hpp" 44 #include "runtime/arguments.hpp" 45 #include "runtime/atomic.hpp" 46 #include "runtime/extendedPC.hpp" 47 #include "runtime/globals.hpp" 48 #include "runtime/interfaceSupport.hpp" 49 #include "runtime/java.hpp" 50 #include "runtime/javaCalls.hpp" 51 #include "runtime/mutexLocker.hpp" 52 #include "runtime/objectMonitor.hpp" 53 #include "runtime/orderAccess.inline.hpp" 54 #include "runtime/osThread.hpp" 55 #include "runtime/perfMemory.hpp" 56 #include "runtime/sharedRuntime.hpp" 57 #include "runtime/statSampler.hpp" 58 #include "runtime/stubRoutines.hpp" 59 #include "runtime/thread.inline.hpp" 60 #include "runtime/threadCritical.hpp" 61 #include "runtime/timer.hpp" 62 #include "runtime/vm_version.hpp" 63 #include "semaphore_posix.hpp" 64 #include "services/attachListener.hpp" 65 #include "services/memTracker.hpp" 66 #include "services/runtimeService.hpp" 67 #include "utilities/decoder.hpp" 68 #include "utilities/defaultStream.hpp" 69 #include "utilities/events.hpp" 70 #include "utilities/growableArray.hpp" 71 #include "utilities/macros.hpp" 72 #include "utilities/vmError.hpp" 73 74 // put OS-includes here 75 # include <dlfcn.h> 76 # include <errno.h> 77 # include <exception> 78 # include <link.h> 79 # include <poll.h> 80 # include <pthread.h> 81 # include <schedctl.h> 82 # include <setjmp.h> 83 # include <signal.h> 84 # include <stdio.h> 85 # include <alloca.h> 86 # include <sys/filio.h> 87 # include <sys/ipc.h> 88 # include <sys/lwp.h> 89 # include <sys/machelf.h> // for elf Sym structure used by dladdr1 90 # include <sys/mman.h> 91 # include <sys/processor.h> 92 # include <sys/procset.h> 93 # include <sys/pset.h> 94 # include <sys/resource.h> 95 # include <sys/shm.h> 96 # include <sys/socket.h> 97 # include <sys/stat.h> 98 # include <sys/systeminfo.h> 99 # include <sys/time.h> 100 # include <sys/times.h> 101 # include <sys/types.h> 102 # include <sys/wait.h> 103 # include <sys/utsname.h> 104 # include <thread.h> 105 # include <unistd.h> 106 # include <sys/priocntl.h> 107 # include <sys/rtpriocntl.h> 108 # include <sys/tspriocntl.h> 109 # include <sys/iapriocntl.h> 110 # include <sys/fxpriocntl.h> 111 # include <sys/loadavg.h> 112 # include <string.h> 113 # include <stdio.h> 114 115 # define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later 116 # include <sys/procfs.h> // see comment in <sys/procfs.h> 117 118 #define MAX_PATH (2 * K) 119 120 // for timer info max values which include all bits 121 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) 122 123 124 // Here are some liblgrp types from sys/lgrp_user.h to be able to 125 // compile on older systems without this header file. 126 127 #ifndef MADV_ACCESS_LWP 128 #define MADV_ACCESS_LWP 7 /* next LWP to access heavily */ 129 #endif 130 #ifndef MADV_ACCESS_MANY 131 #define MADV_ACCESS_MANY 8 /* many processes to access heavily */ 132 #endif 133 134 #ifndef LGRP_RSRC_CPU 135 #define LGRP_RSRC_CPU 0 /* CPU resources */ 136 #endif 137 #ifndef LGRP_RSRC_MEM 138 #define LGRP_RSRC_MEM 1 /* memory resources */ 139 #endif 140 141 // Values for ThreadPriorityPolicy == 1 142 int prio_policy1[CriticalPriority+1] = { 143 -99999, 0, 16, 32, 48, 64, 144 80, 96, 112, 124, 127, 127 }; 145 146 // System parameters used internally 147 static clock_t clock_tics_per_sec = 100; 148 149 // Track if we have called enable_extended_FILE_stdio (on Solaris 10u4+) 150 static bool enabled_extended_FILE_stdio = false; 151 152 // For diagnostics to print a message once. see run_periodic_checks 153 static bool check_addr0_done = false; 154 static sigset_t check_signal_done; 155 static bool check_signals = true; 156 157 address os::Solaris::handler_start; // start pc of thr_sighndlrinfo 158 address os::Solaris::handler_end; // end pc of thr_sighndlrinfo 159 160 address os::Solaris::_main_stack_base = NULL; // 4352906 workaround 161 162 os::Solaris::pthread_setname_np_func_t os::Solaris::_pthread_setname_np = NULL; 163 164 // "default" initializers for missing libc APIs 165 extern "C" { 166 static int lwp_mutex_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; } 167 static int lwp_mutex_destroy(mutex_t *mx) { return 0; } 168 169 static int lwp_cond_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; } 170 static int lwp_cond_destroy(cond_t *cv) { return 0; } 171 } 172 173 // "default" initializers for pthread-based synchronization 174 extern "C" { 175 static int pthread_mutex_default_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; } 176 static int pthread_cond_default_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; } 177 } 178 179 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time); 180 181 static inline size_t adjust_stack_size(address base, size_t size) { 182 if ((ssize_t)size < 0) { 183 // 4759953: Compensate for ridiculous stack size. 184 size = max_intx; 185 } 186 if (size > (size_t)base) { 187 // 4812466: Make sure size doesn't allow the stack to wrap the address space. 188 size = (size_t)base; 189 } 190 return size; 191 } 192 193 static inline stack_t get_stack_info() { 194 stack_t st; 195 int retval = thr_stksegment(&st); 196 st.ss_size = adjust_stack_size((address)st.ss_sp, st.ss_size); 197 assert(retval == 0, "incorrect return value from thr_stksegment"); 198 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned"); 199 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned"); 200 return st; 201 } 202 203 address os::current_stack_base() { 204 int r = thr_main(); 205 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689"); 206 bool is_primordial_thread = r; 207 208 // Workaround 4352906, avoid calls to thr_stksegment by 209 // thr_main after the first one (it looks like we trash 210 // some data, causing the value for ss_sp to be incorrect). 211 if (!is_primordial_thread || os::Solaris::_main_stack_base == NULL) { 212 stack_t st = get_stack_info(); 213 if (is_primordial_thread) { 214 // cache initial value of stack base 215 os::Solaris::_main_stack_base = (address)st.ss_sp; 216 } 217 return (address)st.ss_sp; 218 } else { 219 guarantee(os::Solaris::_main_stack_base != NULL, "Attempt to use null cached stack base"); 220 return os::Solaris::_main_stack_base; 221 } 222 } 223 224 size_t os::current_stack_size() { 225 size_t size; 226 227 int r = thr_main(); 228 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689"); 229 if (!r) { 230 size = get_stack_info().ss_size; 231 } else { 232 struct rlimit limits; 233 getrlimit(RLIMIT_STACK, &limits); 234 size = adjust_stack_size(os::Solaris::_main_stack_base, (size_t)limits.rlim_cur); 235 } 236 // base may not be page aligned 237 address base = current_stack_base(); 238 address bottom = (address)align_size_up((intptr_t)(base - size), os::vm_page_size());; 239 return (size_t)(base - bottom); 240 } 241 242 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 243 return localtime_r(clock, res); 244 } 245 246 void os::Solaris::try_enable_extended_io() { 247 typedef int (*enable_extended_FILE_stdio_t)(int, int); 248 249 if (!UseExtendedFileIO) { 250 return; 251 } 252 253 enable_extended_FILE_stdio_t enabler = 254 (enable_extended_FILE_stdio_t) dlsym(RTLD_DEFAULT, 255 "enable_extended_FILE_stdio"); 256 if (enabler) { 257 enabler(-1, -1); 258 } 259 } 260 261 static int _processors_online = 0; 262 263 jint os::Solaris::_os_thread_limit = 0; 264 volatile jint os::Solaris::_os_thread_count = 0; 265 266 julong os::available_memory() { 267 return Solaris::available_memory(); 268 } 269 270 julong os::Solaris::available_memory() { 271 return (julong)sysconf(_SC_AVPHYS_PAGES) * os::vm_page_size(); 272 } 273 274 julong os::Solaris::_physical_memory = 0; 275 276 julong os::physical_memory() { 277 return Solaris::physical_memory(); 278 } 279 280 static hrtime_t first_hrtime = 0; 281 static const hrtime_t hrtime_hz = 1000*1000*1000; 282 static volatile hrtime_t max_hrtime = 0; 283 284 285 void os::Solaris::initialize_system_info() { 286 set_processor_count(sysconf(_SC_NPROCESSORS_CONF)); 287 _processors_online = sysconf(_SC_NPROCESSORS_ONLN); 288 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) * 289 (julong)sysconf(_SC_PAGESIZE); 290 } 291 292 int os::active_processor_count() { 293 int online_cpus = sysconf(_SC_NPROCESSORS_ONLN); 294 pid_t pid = getpid(); 295 psetid_t pset = PS_NONE; 296 // Are we running in a processor set or is there any processor set around? 297 if (pset_bind(PS_QUERY, P_PID, pid, &pset) == 0) { 298 uint_t pset_cpus; 299 // Query the number of cpus available to us. 300 if (pset_info(pset, NULL, &pset_cpus, NULL) == 0) { 301 assert(pset_cpus > 0 && pset_cpus <= online_cpus, "sanity check"); 302 _processors_online = pset_cpus; 303 return pset_cpus; 304 } 305 } 306 // Otherwise return number of online cpus 307 return online_cpus; 308 } 309 310 static bool find_processors_in_pset(psetid_t pset, 311 processorid_t** id_array, 312 uint_t* id_length) { 313 bool result = false; 314 // Find the number of processors in the processor set. 315 if (pset_info(pset, NULL, id_length, NULL) == 0) { 316 // Make up an array to hold their ids. 317 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal); 318 // Fill in the array with their processor ids. 319 if (pset_info(pset, NULL, id_length, *id_array) == 0) { 320 result = true; 321 } 322 } 323 return result; 324 } 325 326 // Callers of find_processors_online() must tolerate imprecise results -- 327 // the system configuration can change asynchronously because of DR 328 // or explicit psradm operations. 329 // 330 // We also need to take care that the loop (below) terminates as the 331 // number of processors online can change between the _SC_NPROCESSORS_ONLN 332 // request and the loop that builds the list of processor ids. Unfortunately 333 // there's no reliable way to determine the maximum valid processor id, 334 // so we use a manifest constant, MAX_PROCESSOR_ID, instead. See p_online 335 // man pages, which claim the processor id set is "sparse, but 336 // not too sparse". MAX_PROCESSOR_ID is used to ensure that we eventually 337 // exit the loop. 338 // 339 // In the future we'll be able to use sysconf(_SC_CPUID_MAX), but that's 340 // not available on S8.0. 341 342 static bool find_processors_online(processorid_t** id_array, 343 uint* id_length) { 344 const processorid_t MAX_PROCESSOR_ID = 100000; 345 // Find the number of processors online. 346 *id_length = sysconf(_SC_NPROCESSORS_ONLN); 347 // Make up an array to hold their ids. 348 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal); 349 // Processors need not be numbered consecutively. 350 long found = 0; 351 processorid_t next = 0; 352 while (found < *id_length && next < MAX_PROCESSOR_ID) { 353 processor_info_t info; 354 if (processor_info(next, &info) == 0) { 355 // NB, PI_NOINTR processors are effectively online ... 356 if (info.pi_state == P_ONLINE || info.pi_state == P_NOINTR) { 357 (*id_array)[found] = next; 358 found += 1; 359 } 360 } 361 next += 1; 362 } 363 if (found < *id_length) { 364 // The loop above didn't identify the expected number of processors. 365 // We could always retry the operation, calling sysconf(_SC_NPROCESSORS_ONLN) 366 // and re-running the loop, above, but there's no guarantee of progress 367 // if the system configuration is in flux. Instead, we just return what 368 // we've got. Note that in the worst case find_processors_online() could 369 // return an empty set. (As a fall-back in the case of the empty set we 370 // could just return the ID of the current processor). 371 *id_length = found; 372 } 373 374 return true; 375 } 376 377 static bool assign_distribution(processorid_t* id_array, 378 uint id_length, 379 uint* distribution, 380 uint distribution_length) { 381 // We assume we can assign processorid_t's to uint's. 382 assert(sizeof(processorid_t) == sizeof(uint), 383 "can't convert processorid_t to uint"); 384 // Quick check to see if we won't succeed. 385 if (id_length < distribution_length) { 386 return false; 387 } 388 // Assign processor ids to the distribution. 389 // Try to shuffle processors to distribute work across boards, 390 // assuming 4 processors per board. 391 const uint processors_per_board = ProcessDistributionStride; 392 // Find the maximum processor id. 393 processorid_t max_id = 0; 394 for (uint m = 0; m < id_length; m += 1) { 395 max_id = MAX2(max_id, id_array[m]); 396 } 397 // The next id, to limit loops. 398 const processorid_t limit_id = max_id + 1; 399 // Make up markers for available processors. 400 bool* available_id = NEW_C_HEAP_ARRAY(bool, limit_id, mtInternal); 401 for (uint c = 0; c < limit_id; c += 1) { 402 available_id[c] = false; 403 } 404 for (uint a = 0; a < id_length; a += 1) { 405 available_id[id_array[a]] = true; 406 } 407 // Step by "boards", then by "slot", copying to "assigned". 408 // NEEDS_CLEANUP: The assignment of processors should be stateful, 409 // remembering which processors have been assigned by 410 // previous calls, etc., so as to distribute several 411 // independent calls of this method. What we'd like is 412 // It would be nice to have an API that let us ask 413 // how many processes are bound to a processor, 414 // but we don't have that, either. 415 // In the short term, "board" is static so that 416 // subsequent distributions don't all start at board 0. 417 static uint board = 0; 418 uint assigned = 0; 419 // Until we've found enough processors .... 420 while (assigned < distribution_length) { 421 // ... find the next available processor in the board. 422 for (uint slot = 0; slot < processors_per_board; slot += 1) { 423 uint try_id = board * processors_per_board + slot; 424 if ((try_id < limit_id) && (available_id[try_id] == true)) { 425 distribution[assigned] = try_id; 426 available_id[try_id] = false; 427 assigned += 1; 428 break; 429 } 430 } 431 board += 1; 432 if (board * processors_per_board + 0 >= limit_id) { 433 board = 0; 434 } 435 } 436 if (available_id != NULL) { 437 FREE_C_HEAP_ARRAY(bool, available_id); 438 } 439 return true; 440 } 441 442 void os::set_native_thread_name(const char *name) { 443 if (Solaris::_pthread_setname_np != NULL) { 444 // Only the first 31 bytes of 'name' are processed by pthread_setname_np 445 // but we explicitly copy into a size-limited buffer to avoid any 446 // possible overflow. 447 char buf[32]; 448 snprintf(buf, sizeof(buf), "%s", name); 449 buf[sizeof(buf) - 1] = '\0'; 450 Solaris::_pthread_setname_np(pthread_self(), buf); 451 } 452 } 453 454 bool os::distribute_processes(uint length, uint* distribution) { 455 bool result = false; 456 // Find the processor id's of all the available CPUs. 457 processorid_t* id_array = NULL; 458 uint id_length = 0; 459 // There are some races between querying information and using it, 460 // since processor sets can change dynamically. 461 psetid_t pset = PS_NONE; 462 // Are we running in a processor set? 463 if ((pset_bind(PS_QUERY, P_PID, P_MYID, &pset) == 0) && pset != PS_NONE) { 464 result = find_processors_in_pset(pset, &id_array, &id_length); 465 } else { 466 result = find_processors_online(&id_array, &id_length); 467 } 468 if (result == true) { 469 if (id_length >= length) { 470 result = assign_distribution(id_array, id_length, distribution, length); 471 } else { 472 result = false; 473 } 474 } 475 if (id_array != NULL) { 476 FREE_C_HEAP_ARRAY(processorid_t, id_array); 477 } 478 return result; 479 } 480 481 bool os::bind_to_processor(uint processor_id) { 482 // We assume that a processorid_t can be stored in a uint. 483 assert(sizeof(uint) == sizeof(processorid_t), 484 "can't convert uint to processorid_t"); 485 int bind_result = 486 processor_bind(P_LWPID, // bind LWP. 487 P_MYID, // bind current LWP. 488 (processorid_t) processor_id, // id. 489 NULL); // don't return old binding. 490 return (bind_result == 0); 491 } 492 493 // Return true if user is running as root. 494 495 bool os::have_special_privileges() { 496 static bool init = false; 497 static bool privileges = false; 498 if (!init) { 499 privileges = (getuid() != geteuid()) || (getgid() != getegid()); 500 init = true; 501 } 502 return privileges; 503 } 504 505 506 void os::init_system_properties_values() { 507 // The next steps are taken in the product version: 508 // 509 // Obtain the JAVA_HOME value from the location of libjvm.so. 510 // This library should be located at: 511 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so. 512 // 513 // If "/jre/lib/" appears at the right place in the path, then we 514 // assume libjvm.so is installed in a JDK and we use this path. 515 // 516 // Otherwise exit with message: "Could not create the Java virtual machine." 517 // 518 // The following extra steps are taken in the debugging version: 519 // 520 // If "/jre/lib/" does NOT appear at the right place in the path 521 // instead of exit check for $JAVA_HOME environment variable. 522 // 523 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, 524 // then we append a fake suffix "hotspot/libjvm.so" to this path so 525 // it looks like libjvm.so is installed there 526 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so. 527 // 528 // Otherwise exit. 529 // 530 // Important note: if the location of libjvm.so changes this 531 // code needs to be changed accordingly. 532 533 // Base path of extensions installed on the system. 534 #define SYS_EXT_DIR "/usr/jdk/packages" 535 #define EXTENSIONS_DIR "/lib/ext" 536 537 char cpu_arch[12]; 538 // Buffer that fits several sprintfs. 539 // Note that the space for the colon and the trailing null are provided 540 // by the nulls included by the sizeof operator. 541 const size_t bufsize = 542 MAX3((size_t)MAXPATHLEN, // For dll_dir & friends. 543 sizeof(SYS_EXT_DIR) + sizeof("/lib/") + strlen(cpu_arch), // invariant ld_library_path 544 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR)); // extensions dir 545 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal); 546 547 // sysclasspath, java_home, dll_dir 548 { 549 char *pslash; 550 os::jvm_path(buf, bufsize); 551 552 // Found the full path to libjvm.so. 553 // Now cut the path to <java_home>/jre if we can. 554 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so. 555 pslash = strrchr(buf, '/'); 556 if (pslash != NULL) { 557 *pslash = '\0'; // Get rid of /{client|server|hotspot}. 558 } 559 Arguments::set_dll_dir(buf); 560 561 if (pslash != NULL) { 562 pslash = strrchr(buf, '/'); 563 if (pslash != NULL) { 564 *pslash = '\0'; // Get rid of /<arch>. 565 pslash = strrchr(buf, '/'); 566 if (pslash != NULL) { 567 *pslash = '\0'; // Get rid of /lib. 568 } 569 } 570 } 571 Arguments::set_java_home(buf); 572 set_boot_path('/', ':'); 573 } 574 575 // Where to look for native libraries. 576 { 577 // Use dlinfo() to determine the correct java.library.path. 578 // 579 // If we're launched by the Java launcher, and the user 580 // does not set java.library.path explicitly on the commandline, 581 // the Java launcher sets LD_LIBRARY_PATH for us and unsets 582 // LD_LIBRARY_PATH_32 and LD_LIBRARY_PATH_64. In this case 583 // dlinfo returns LD_LIBRARY_PATH + crle settings (including 584 // /usr/lib), which is exactly what we want. 585 // 586 // If the user does set java.library.path, it completely 587 // overwrites this setting, and always has. 588 // 589 // If we're not launched by the Java launcher, we may 590 // get here with any/all of the LD_LIBRARY_PATH[_32|64] 591 // settings. Again, dlinfo does exactly what we want. 592 593 Dl_serinfo info_sz, *info = &info_sz; 594 Dl_serpath *path; 595 char *library_path; 596 char *common_path = buf; 597 598 // Determine search path count and required buffer size. 599 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFOSIZE, (void *)info) == -1) { 600 FREE_C_HEAP_ARRAY(char, buf); 601 vm_exit_during_initialization("dlinfo SERINFOSIZE request", dlerror()); 602 } 603 604 // Allocate new buffer and initialize. 605 info = (Dl_serinfo*)NEW_C_HEAP_ARRAY(char, info_sz.dls_size, mtInternal); 606 info->dls_size = info_sz.dls_size; 607 info->dls_cnt = info_sz.dls_cnt; 608 609 // Obtain search path information. 610 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFO, (void *)info) == -1) { 611 FREE_C_HEAP_ARRAY(char, buf); 612 FREE_C_HEAP_ARRAY(char, info); 613 vm_exit_during_initialization("dlinfo SERINFO request", dlerror()); 614 } 615 616 path = &info->dls_serpath[0]; 617 618 // Note: Due to a legacy implementation, most of the library path 619 // is set in the launcher. This was to accomodate linking restrictions 620 // on legacy Solaris implementations (which are no longer supported). 621 // Eventually, all the library path setting will be done here. 622 // 623 // However, to prevent the proliferation of improperly built native 624 // libraries, the new path component /usr/jdk/packages is added here. 625 626 // Determine the actual CPU architecture. 627 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch)); 628 #ifdef _LP64 629 // If we are a 64-bit vm, perform the following translations: 630 // sparc -> sparcv9 631 // i386 -> amd64 632 if (strcmp(cpu_arch, "sparc") == 0) { 633 strcat(cpu_arch, "v9"); 634 } else if (strcmp(cpu_arch, "i386") == 0) { 635 strcpy(cpu_arch, "amd64"); 636 } 637 #endif 638 639 // Construct the invariant part of ld_library_path. 640 sprintf(common_path, SYS_EXT_DIR "/lib/%s", cpu_arch); 641 642 // Struct size is more than sufficient for the path components obtained 643 // through the dlinfo() call, so only add additional space for the path 644 // components explicitly added here. 645 size_t library_path_size = info->dls_size + strlen(common_path); 646 library_path = (char *)NEW_C_HEAP_ARRAY(char, library_path_size, mtInternal); 647 library_path[0] = '\0'; 648 649 // Construct the desired Java library path from the linker's library 650 // search path. 651 // 652 // For compatibility, it is optimal that we insert the additional path 653 // components specific to the Java VM after those components specified 654 // in LD_LIBRARY_PATH (if any) but before those added by the ld.so 655 // infrastructure. 656 if (info->dls_cnt == 0) { // Not sure this can happen, but allow for it. 657 strcpy(library_path, common_path); 658 } else { 659 int inserted = 0; 660 int i; 661 for (i = 0; i < info->dls_cnt; i++, path++) { 662 uint_t flags = path->dls_flags & LA_SER_MASK; 663 if (((flags & LA_SER_LIBPATH) == 0) && !inserted) { 664 strcat(library_path, common_path); 665 strcat(library_path, os::path_separator()); 666 inserted = 1; 667 } 668 strcat(library_path, path->dls_name); 669 strcat(library_path, os::path_separator()); 670 } 671 // Eliminate trailing path separator. 672 library_path[strlen(library_path)-1] = '\0'; 673 } 674 675 // happens before argument parsing - can't use a trace flag 676 // tty->print_raw("init_system_properties_values: native lib path: "); 677 // tty->print_raw_cr(library_path); 678 679 // Callee copies into its own buffer. 680 Arguments::set_library_path(library_path); 681 682 FREE_C_HEAP_ARRAY(char, library_path); 683 FREE_C_HEAP_ARRAY(char, info); 684 } 685 686 // Extensions directories. 687 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home()); 688 Arguments::set_ext_dirs(buf); 689 690 FREE_C_HEAP_ARRAY(char, buf); 691 692 #undef SYS_EXT_DIR 693 #undef EXTENSIONS_DIR 694 } 695 696 void os::breakpoint() { 697 BREAKPOINT; 698 } 699 700 bool os::obsolete_option(const JavaVMOption *option) { 701 if (!strncmp(option->optionString, "-Xt", 3)) { 702 return true; 703 } else if (!strncmp(option->optionString, "-Xtm", 4)) { 704 return true; 705 } else if (!strncmp(option->optionString, "-Xverifyheap", 12)) { 706 return true; 707 } else if (!strncmp(option->optionString, "-Xmaxjitcodesize", 16)) { 708 return true; 709 } 710 return false; 711 } 712 713 bool os::Solaris::valid_stack_address(Thread* thread, address sp) { 714 address stackStart = (address)thread->stack_base(); 715 address stackEnd = (address)(stackStart - (address)thread->stack_size()); 716 if (sp < stackStart && sp >= stackEnd) return true; 717 return false; 718 } 719 720 extern "C" void breakpoint() { 721 // use debugger to set breakpoint here 722 } 723 724 static thread_t main_thread; 725 726 // Thread start routine for all newly created threads 727 extern "C" void* thread_native_entry(void* thread_addr) { 728 // Try to randomize the cache line index of hot stack frames. 729 // This helps when threads of the same stack traces evict each other's 730 // cache lines. The threads can be either from the same JVM instance, or 731 // from different JVM instances. The benefit is especially true for 732 // processors with hyperthreading technology. 733 static int counter = 0; 734 int pid = os::current_process_id(); 735 alloca(((pid ^ counter++) & 7) * 128); 736 737 int prio; 738 Thread* thread = (Thread*)thread_addr; 739 740 thread->initialize_thread_current(); 741 742 OSThread* osthr = thread->osthread(); 743 744 osthr->set_lwp_id(_lwp_self()); // Store lwp in case we are bound 745 thread->_schedctl = (void *) schedctl_init(); 746 747 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ").", 748 os::current_thread_id()); 749 750 if (UseNUMA) { 751 int lgrp_id = os::numa_get_group_id(); 752 if (lgrp_id != -1) { 753 thread->set_lgrp_id(lgrp_id); 754 } 755 } 756 757 // Our priority was set when we were created, and stored in the 758 // osthread, but couldn't be passed through to our LWP until now. 759 // So read back the priority and set it again. 760 761 if (osthr->thread_id() != -1) { 762 if (UseThreadPriorities) { 763 int prio = osthr->native_priority(); 764 if (ThreadPriorityVerbose) { 765 tty->print_cr("Starting Thread " INTPTR_FORMAT ", LWP is " 766 INTPTR_FORMAT ", setting priority: %d\n", 767 osthr->thread_id(), osthr->lwp_id(), prio); 768 } 769 os::set_native_priority(thread, prio); 770 } 771 } else if (ThreadPriorityVerbose) { 772 warning("Can't set priority in _start routine, thread id hasn't been set\n"); 773 } 774 775 assert(osthr->get_state() == RUNNABLE, "invalid os thread state"); 776 777 // initialize signal mask for this thread 778 os::Solaris::hotspot_sigmask(thread); 779 780 thread->run(); 781 782 // One less thread is executing 783 // When the VMThread gets here, the main thread may have already exited 784 // which frees the CodeHeap containing the Atomic::dec code 785 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) { 786 Atomic::dec(&os::Solaris::_os_thread_count); 787 } 788 789 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ").", os::current_thread_id()); 790 791 // If a thread has not deleted itself ("delete this") as part of its 792 // termination sequence, we have to ensure thread-local-storage is 793 // cleared before we actually terminate. No threads should ever be 794 // deleted asynchronously with respect to their termination. 795 if (Thread::current_or_null_safe() != NULL) { 796 assert(Thread::current_or_null_safe() == thread, "current thread is wrong"); 797 thread->clear_thread_current(); 798 } 799 800 if (UseDetachedThreads) { 801 thr_exit(NULL); 802 ShouldNotReachHere(); 803 } 804 return NULL; 805 } 806 807 static OSThread* create_os_thread(Thread* thread, thread_t thread_id) { 808 // Allocate the OSThread object 809 OSThread* osthread = new OSThread(NULL, NULL); 810 if (osthread == NULL) return NULL; 811 812 // Store info on the Solaris thread into the OSThread 813 osthread->set_thread_id(thread_id); 814 osthread->set_lwp_id(_lwp_self()); 815 thread->_schedctl = (void *) schedctl_init(); 816 817 if (UseNUMA) { 818 int lgrp_id = os::numa_get_group_id(); 819 if (lgrp_id != -1) { 820 thread->set_lgrp_id(lgrp_id); 821 } 822 } 823 824 if (ThreadPriorityVerbose) { 825 tty->print_cr("In create_os_thread, Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT "\n", 826 osthread->thread_id(), osthread->lwp_id()); 827 } 828 829 // Initial thread state is INITIALIZED, not SUSPENDED 830 osthread->set_state(INITIALIZED); 831 832 return osthread; 833 } 834 835 void os::Solaris::hotspot_sigmask(Thread* thread) { 836 //Save caller's signal mask 837 sigset_t sigmask; 838 pthread_sigmask(SIG_SETMASK, NULL, &sigmask); 839 OSThread *osthread = thread->osthread(); 840 osthread->set_caller_sigmask(sigmask); 841 842 pthread_sigmask(SIG_UNBLOCK, os::Solaris::unblocked_signals(), NULL); 843 if (!ReduceSignalUsage) { 844 if (thread->is_VM_thread()) { 845 // Only the VM thread handles BREAK_SIGNAL ... 846 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); 847 } else { 848 // ... all other threads block BREAK_SIGNAL 849 assert(!sigismember(vm_signals(), SIGINT), "SIGINT should not be blocked"); 850 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); 851 } 852 } 853 } 854 855 bool os::create_attached_thread(JavaThread* thread) { 856 #ifdef ASSERT 857 thread->verify_not_published(); 858 #endif 859 OSThread* osthread = create_os_thread(thread, thr_self()); 860 if (osthread == NULL) { 861 return false; 862 } 863 864 // Initial thread state is RUNNABLE 865 osthread->set_state(RUNNABLE); 866 thread->set_osthread(osthread); 867 868 // initialize signal mask for this thread 869 // and save the caller's signal mask 870 os::Solaris::hotspot_sigmask(thread); 871 872 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ").", 873 os::current_thread_id()); 874 875 return true; 876 } 877 878 bool os::create_main_thread(JavaThread* thread) { 879 #ifdef ASSERT 880 thread->verify_not_published(); 881 #endif 882 if (_starting_thread == NULL) { 883 _starting_thread = create_os_thread(thread, main_thread); 884 if (_starting_thread == NULL) { 885 return false; 886 } 887 } 888 889 // The primodial thread is runnable from the start 890 _starting_thread->set_state(RUNNABLE); 891 892 thread->set_osthread(_starting_thread); 893 894 // initialize signal mask for this thread 895 // and save the caller's signal mask 896 os::Solaris::hotspot_sigmask(thread); 897 898 return true; 899 } 900 901 // Helper function to trace thread attributes, similar to os::Posix::describe_pthread_attr() 902 static char* describe_thr_create_attributes(char* buf, size_t buflen, 903 size_t stacksize, long flags) { 904 stringStream ss(buf, buflen); 905 ss.print("stacksize: " SIZE_FORMAT "k, ", stacksize / 1024); 906 ss.print("flags: "); 907 #define PRINT_FLAG(f) if (flags & f) ss.print( #f " "); 908 #define ALL(X) \ 909 X(THR_SUSPENDED) \ 910 X(THR_DETACHED) \ 911 X(THR_BOUND) \ 912 X(THR_NEW_LWP) \ 913 X(THR_DAEMON) 914 ALL(PRINT_FLAG) 915 #undef ALL 916 #undef PRINT_FLAG 917 return buf; 918 } 919 920 bool os::create_thread(Thread* thread, ThreadType thr_type, 921 size_t stack_size) { 922 // Allocate the OSThread object 923 OSThread* osthread = new OSThread(NULL, NULL); 924 if (osthread == NULL) { 925 return false; 926 } 927 928 if (ThreadPriorityVerbose) { 929 char *thrtyp; 930 switch (thr_type) { 931 case vm_thread: 932 thrtyp = (char *)"vm"; 933 break; 934 case cgc_thread: 935 thrtyp = (char *)"cgc"; 936 break; 937 case pgc_thread: 938 thrtyp = (char *)"pgc"; 939 break; 940 case java_thread: 941 thrtyp = (char *)"java"; 942 break; 943 case compiler_thread: 944 thrtyp = (char *)"compiler"; 945 break; 946 case watcher_thread: 947 thrtyp = (char *)"watcher"; 948 break; 949 default: 950 thrtyp = (char *)"unknown"; 951 break; 952 } 953 tty->print_cr("In create_thread, creating a %s thread\n", thrtyp); 954 } 955 956 // Calculate stack size if it's not specified by caller. 957 if (stack_size == 0) { 958 // The default stack size 1M (2M for LP64). 959 stack_size = (BytesPerWord >> 2) * K * K; 960 961 switch (thr_type) { 962 case os::java_thread: 963 // Java threads use ThreadStackSize which default value can be changed with the flag -Xss 964 if (JavaThread::stack_size_at_create() > 0) stack_size = JavaThread::stack_size_at_create(); 965 break; 966 case os::compiler_thread: 967 if (CompilerThreadStackSize > 0) { 968 stack_size = (size_t)(CompilerThreadStackSize * K); 969 break; 970 } // else fall through: 971 // use VMThreadStackSize if CompilerThreadStackSize is not defined 972 case os::vm_thread: 973 case os::pgc_thread: 974 case os::cgc_thread: 975 case os::watcher_thread: 976 if (VMThreadStackSize > 0) stack_size = (size_t)(VMThreadStackSize * K); 977 break; 978 } 979 } 980 stack_size = MAX2(stack_size, os::Solaris::min_stack_allowed); 981 982 // Initial state is ALLOCATED but not INITIALIZED 983 osthread->set_state(ALLOCATED); 984 985 if (os::Solaris::_os_thread_count > os::Solaris::_os_thread_limit) { 986 // We got lots of threads. Check if we still have some address space left. 987 // Need to be at least 5Mb of unreserved address space. We do check by 988 // trying to reserve some. 989 const size_t VirtualMemoryBangSize = 20*K*K; 990 char* mem = os::reserve_memory(VirtualMemoryBangSize); 991 if (mem == NULL) { 992 delete osthread; 993 return false; 994 } else { 995 // Release the memory again 996 os::release_memory(mem, VirtualMemoryBangSize); 997 } 998 } 999 1000 // Setup osthread because the child thread may need it. 1001 thread->set_osthread(osthread); 1002 1003 // Create the Solaris thread 1004 thread_t tid = 0; 1005 long flags = (UseDetachedThreads ? THR_DETACHED : 0) | THR_SUSPENDED; 1006 int status; 1007 1008 // Mark that we don't have an lwp or thread id yet. 1009 // In case we attempt to set the priority before the thread starts. 1010 osthread->set_lwp_id(-1); 1011 osthread->set_thread_id(-1); 1012 1013 status = thr_create(NULL, stack_size, thread_native_entry, thread, flags, &tid); 1014 1015 char buf[64]; 1016 if (status == 0) { 1017 log_info(os, thread)("Thread started (tid: " UINTX_FORMAT ", attributes: %s). ", 1018 (uintx) tid, describe_thr_create_attributes(buf, sizeof(buf), stack_size, flags)); 1019 } else { 1020 log_warning(os, thread)("Failed to start thread - thr_create failed (%s) for attributes: %s.", 1021 os::errno_name(status), describe_thr_create_attributes(buf, sizeof(buf), stack_size, flags)); 1022 } 1023 1024 if (status != 0) { 1025 thread->set_osthread(NULL); 1026 // Need to clean up stuff we've allocated so far 1027 delete osthread; 1028 return false; 1029 } 1030 1031 Atomic::inc(&os::Solaris::_os_thread_count); 1032 1033 // Store info on the Solaris thread into the OSThread 1034 osthread->set_thread_id(tid); 1035 1036 // Remember that we created this thread so we can set priority on it 1037 osthread->set_vm_created(); 1038 1039 // Most thread types will set an explicit priority before starting the thread, 1040 // but for those that don't we need a valid value to read back in thread_native_entry. 1041 osthread->set_native_priority(NormPriority); 1042 1043 // Initial thread state is INITIALIZED, not SUSPENDED 1044 osthread->set_state(INITIALIZED); 1045 1046 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain 1047 return true; 1048 } 1049 1050 // defined for >= Solaris 10. This allows builds on earlier versions 1051 // of Solaris to take advantage of the newly reserved Solaris JVM signals. 1052 // With SIGJVM1, SIGJVM2, ASYNC_SIGNAL is SIGJVM2. Previously INTERRUPT_SIGNAL 1053 // was SIGJVM1. 1054 // 1055 #if !defined(SIGJVM1) 1056 #define SIGJVM1 39 1057 #define SIGJVM2 40 1058 #endif 1059 1060 debug_only(static bool signal_sets_initialized = false); 1061 static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs; 1062 1063 int os::Solaris::_SIGasync = ASYNC_SIGNAL; 1064 1065 bool os::Solaris::is_sig_ignored(int sig) { 1066 struct sigaction oact; 1067 sigaction(sig, (struct sigaction*)NULL, &oact); 1068 void* ohlr = oact.sa_sigaction ? CAST_FROM_FN_PTR(void*, oact.sa_sigaction) 1069 : CAST_FROM_FN_PTR(void*, oact.sa_handler); 1070 if (ohlr == CAST_FROM_FN_PTR(void*, SIG_IGN)) { 1071 return true; 1072 } else { 1073 return false; 1074 } 1075 } 1076 1077 // Note: SIGRTMIN is a macro that calls sysconf() so it will 1078 // dynamically detect SIGRTMIN value for the system at runtime, not buildtime 1079 static bool isJVM1available() { 1080 return SIGJVM1 < SIGRTMIN; 1081 } 1082 1083 void os::Solaris::signal_sets_init() { 1084 // Should also have an assertion stating we are still single-threaded. 1085 assert(!signal_sets_initialized, "Already initialized"); 1086 // Fill in signals that are necessarily unblocked for all threads in 1087 // the VM. Currently, we unblock the following signals: 1088 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden 1089 // by -Xrs (=ReduceSignalUsage)); 1090 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all 1091 // other threads. The "ReduceSignalUsage" boolean tells us not to alter 1092 // the dispositions or masks wrt these signals. 1093 // Programs embedding the VM that want to use the above signals for their 1094 // own purposes must, at this time, use the "-Xrs" option to prevent 1095 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. 1096 // (See bug 4345157, and other related bugs). 1097 // In reality, though, unblocking these signals is really a nop, since 1098 // these signals are not blocked by default. 1099 sigemptyset(&unblocked_sigs); 1100 sigemptyset(&allowdebug_blocked_sigs); 1101 sigaddset(&unblocked_sigs, SIGILL); 1102 sigaddset(&unblocked_sigs, SIGSEGV); 1103 sigaddset(&unblocked_sigs, SIGBUS); 1104 sigaddset(&unblocked_sigs, SIGFPE); 1105 1106 // Always true on Solaris 10+ 1107 guarantee(isJVM1available(), "SIGJVM1/2 missing!"); 1108 os::Solaris::set_SIGasync(SIGJVM2); 1109 1110 sigaddset(&unblocked_sigs, os::Solaris::SIGasync()); 1111 1112 if (!ReduceSignalUsage) { 1113 if (!os::Solaris::is_sig_ignored(SHUTDOWN1_SIGNAL)) { 1114 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); 1115 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN1_SIGNAL); 1116 } 1117 if (!os::Solaris::is_sig_ignored(SHUTDOWN2_SIGNAL)) { 1118 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); 1119 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN2_SIGNAL); 1120 } 1121 if (!os::Solaris::is_sig_ignored(SHUTDOWN3_SIGNAL)) { 1122 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); 1123 sigaddset(&allowdebug_blocked_sigs, SHUTDOWN3_SIGNAL); 1124 } 1125 } 1126 // Fill in signals that are blocked by all but the VM thread. 1127 sigemptyset(&vm_sigs); 1128 if (!ReduceSignalUsage) { 1129 sigaddset(&vm_sigs, BREAK_SIGNAL); 1130 } 1131 debug_only(signal_sets_initialized = true); 1132 1133 // For diagnostics only used in run_periodic_checks 1134 sigemptyset(&check_signal_done); 1135 } 1136 1137 // These are signals that are unblocked while a thread is running Java. 1138 // (For some reason, they get blocked by default.) 1139 sigset_t* os::Solaris::unblocked_signals() { 1140 assert(signal_sets_initialized, "Not initialized"); 1141 return &unblocked_sigs; 1142 } 1143 1144 // These are the signals that are blocked while a (non-VM) thread is 1145 // running Java. Only the VM thread handles these signals. 1146 sigset_t* os::Solaris::vm_signals() { 1147 assert(signal_sets_initialized, "Not initialized"); 1148 return &vm_sigs; 1149 } 1150 1151 // These are signals that are blocked during cond_wait to allow debugger in 1152 sigset_t* os::Solaris::allowdebug_blocked_signals() { 1153 assert(signal_sets_initialized, "Not initialized"); 1154 return &allowdebug_blocked_sigs; 1155 } 1156 1157 1158 void _handle_uncaught_cxx_exception() { 1159 VMError::report_and_die("An uncaught C++ exception"); 1160 } 1161 1162 1163 // First crack at OS-specific initialization, from inside the new thread. 1164 void os::initialize_thread(Thread* thr) { 1165 int r = thr_main(); 1166 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689"); 1167 if (r) { 1168 JavaThread* jt = (JavaThread *)thr; 1169 assert(jt != NULL, "Sanity check"); 1170 size_t stack_size; 1171 address base = jt->stack_base(); 1172 if (Arguments::created_by_java_launcher()) { 1173 // Use 2MB to allow for Solaris 7 64 bit mode. 1174 stack_size = JavaThread::stack_size_at_create() == 0 1175 ? 2048*K : JavaThread::stack_size_at_create(); 1176 1177 // There are rare cases when we may have already used more than 1178 // the basic stack size allotment before this method is invoked. 1179 // Attempt to allow for a normally sized java_stack. 1180 size_t current_stack_offset = (size_t)(base - (address)&stack_size); 1181 stack_size += ReservedSpace::page_align_size_down(current_stack_offset); 1182 } else { 1183 // 6269555: If we were not created by a Java launcher, i.e. if we are 1184 // running embedded in a native application, treat the primordial thread 1185 // as much like a native attached thread as possible. This means using 1186 // the current stack size from thr_stksegment(), unless it is too large 1187 // to reliably setup guard pages. A reasonable max size is 8MB. 1188 size_t current_size = current_stack_size(); 1189 // This should never happen, but just in case.... 1190 if (current_size == 0) current_size = 2 * K * K; 1191 stack_size = current_size > (8 * K * K) ? (8 * K * K) : current_size; 1192 } 1193 address bottom = (address)align_size_up((intptr_t)(base - stack_size), os::vm_page_size());; 1194 stack_size = (size_t)(base - bottom); 1195 1196 assert(stack_size > 0, "Stack size calculation problem"); 1197 1198 if (stack_size > jt->stack_size()) { 1199 #ifndef PRODUCT 1200 struct rlimit limits; 1201 getrlimit(RLIMIT_STACK, &limits); 1202 size_t size = adjust_stack_size(base, (size_t)limits.rlim_cur); 1203 assert(size >= jt->stack_size(), "Stack size problem in main thread"); 1204 #endif 1205 tty->print_cr("Stack size of %d Kb exceeds current limit of %d Kb.\n" 1206 "(Stack sizes are rounded up to a multiple of the system page size.)\n" 1207 "See limit(1) to increase the stack size limit.", 1208 stack_size / K, jt->stack_size() / K); 1209 vm_exit(1); 1210 } 1211 assert(jt->stack_size() >= stack_size, 1212 "Attempt to map more stack than was allocated"); 1213 jt->set_stack_size(stack_size); 1214 } 1215 1216 // With the T2 libthread (T1 is no longer supported) threads are always bound 1217 // and we use stackbanging in all cases. 1218 1219 os::Solaris::init_thread_fpu_state(); 1220 std::set_terminate(_handle_uncaught_cxx_exception); 1221 } 1222 1223 1224 1225 // Free Solaris resources related to the OSThread 1226 void os::free_thread(OSThread* osthread) { 1227 assert(osthread != NULL, "os::free_thread but osthread not set"); 1228 1229 // We are told to free resources of the argument thread, 1230 // but we can only really operate on the current thread. 1231 assert(Thread::current()->osthread() == osthread, 1232 "os::free_thread but not current thread"); 1233 1234 // Restore caller's signal mask 1235 sigset_t sigmask = osthread->caller_sigmask(); 1236 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); 1237 1238 delete osthread; 1239 } 1240 1241 void os::pd_start_thread(Thread* thread) { 1242 int status = thr_continue(thread->osthread()->thread_id()); 1243 assert_status(status == 0, status, "thr_continue failed"); 1244 } 1245 1246 1247 intx os::current_thread_id() { 1248 return (intx)thr_self(); 1249 } 1250 1251 static pid_t _initial_pid = 0; 1252 1253 int os::current_process_id() { 1254 return (int)(_initial_pid ? _initial_pid : getpid()); 1255 } 1256 1257 // gethrtime() should be monotonic according to the documentation, 1258 // but some virtualized platforms are known to break this guarantee. 1259 // getTimeNanos() must be guaranteed not to move backwards, so we 1260 // are forced to add a check here. 1261 inline hrtime_t getTimeNanos() { 1262 const hrtime_t now = gethrtime(); 1263 const hrtime_t prev = max_hrtime; 1264 if (now <= prev) { 1265 return prev; // same or retrograde time; 1266 } 1267 const hrtime_t obsv = Atomic::cmpxchg(now, (volatile jlong*)&max_hrtime, prev); 1268 assert(obsv >= prev, "invariant"); // Monotonicity 1269 // If the CAS succeeded then we're done and return "now". 1270 // If the CAS failed and the observed value "obsv" is >= now then 1271 // we should return "obsv". If the CAS failed and now > obsv > prv then 1272 // some other thread raced this thread and installed a new value, in which case 1273 // we could either (a) retry the entire operation, (b) retry trying to install now 1274 // or (c) just return obsv. We use (c). No loop is required although in some cases 1275 // we might discard a higher "now" value in deference to a slightly lower but freshly 1276 // installed obsv value. That's entirely benign -- it admits no new orderings compared 1277 // to (a) or (b) -- and greatly reduces coherence traffic. 1278 // We might also condition (c) on the magnitude of the delta between obsv and now. 1279 // Avoiding excessive CAS operations to hot RW locations is critical. 1280 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate 1281 return (prev == obsv) ? now : obsv; 1282 } 1283 1284 // Time since start-up in seconds to a fine granularity. 1285 // Used by VMSelfDestructTimer and the MemProfiler. 1286 double os::elapsedTime() { 1287 return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz; 1288 } 1289 1290 jlong os::elapsed_counter() { 1291 return (jlong)(getTimeNanos() - first_hrtime); 1292 } 1293 1294 jlong os::elapsed_frequency() { 1295 return hrtime_hz; 1296 } 1297 1298 // Return the real, user, and system times in seconds from an 1299 // arbitrary fixed point in the past. 1300 bool os::getTimesSecs(double* process_real_time, 1301 double* process_user_time, 1302 double* process_system_time) { 1303 struct tms ticks; 1304 clock_t real_ticks = times(&ticks); 1305 1306 if (real_ticks == (clock_t) (-1)) { 1307 return false; 1308 } else { 1309 double ticks_per_second = (double) clock_tics_per_sec; 1310 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; 1311 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; 1312 // For consistency return the real time from getTimeNanos() 1313 // converted to seconds. 1314 *process_real_time = ((double) getTimeNanos()) / ((double) NANOUNITS); 1315 1316 return true; 1317 } 1318 } 1319 1320 bool os::supports_vtime() { return true; } 1321 bool os::enable_vtime() { return false; } 1322 bool os::vtime_enabled() { return false; } 1323 1324 double os::elapsedVTime() { 1325 return (double)gethrvtime() / (double)hrtime_hz; 1326 } 1327 1328 // Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis 1329 jlong os::javaTimeMillis() { 1330 timeval t; 1331 if (gettimeofday(&t, NULL) == -1) { 1332 fatal("os::javaTimeMillis: gettimeofday (%s)", os::strerror(errno)); 1333 } 1334 return jlong(t.tv_sec) * 1000 + jlong(t.tv_usec) / 1000; 1335 } 1336 1337 // Must return seconds+nanos since Jan 1 1970. This must use the same 1338 // time source as javaTimeMillis and can't use get_nsec_fromepoch as 1339 // we need better than 1ms accuracy 1340 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) { 1341 timeval t; 1342 if (gettimeofday(&t, NULL) == -1) { 1343 fatal("os::javaTimeSystemUTC: gettimeofday (%s)", os::strerror(errno)); 1344 } 1345 seconds = jlong(t.tv_sec); 1346 nanos = jlong(t.tv_usec) * 1000; 1347 } 1348 1349 1350 jlong os::javaTimeNanos() { 1351 return (jlong)getTimeNanos(); 1352 } 1353 1354 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 1355 info_ptr->max_value = ALL_64_BITS; // gethrtime() uses all 64 bits 1356 info_ptr->may_skip_backward = false; // not subject to resetting or drifting 1357 info_ptr->may_skip_forward = false; // not subject to resetting or drifting 1358 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 1359 } 1360 1361 char * os::local_time_string(char *buf, size_t buflen) { 1362 struct tm t; 1363 time_t long_time; 1364 time(&long_time); 1365 localtime_r(&long_time, &t); 1366 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 1367 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, 1368 t.tm_hour, t.tm_min, t.tm_sec); 1369 return buf; 1370 } 1371 1372 // Note: os::shutdown() might be called very early during initialization, or 1373 // called from signal handler. Before adding something to os::shutdown(), make 1374 // sure it is async-safe and can handle partially initialized VM. 1375 void os::shutdown() { 1376 1377 // allow PerfMemory to attempt cleanup of any persistent resources 1378 perfMemory_exit(); 1379 1380 // needs to remove object in file system 1381 AttachListener::abort(); 1382 1383 // flush buffered output, finish log files 1384 ostream_abort(); 1385 1386 // Check for abort hook 1387 abort_hook_t abort_hook = Arguments::abort_hook(); 1388 if (abort_hook != NULL) { 1389 abort_hook(); 1390 } 1391 } 1392 1393 // Note: os::abort() might be called very early during initialization, or 1394 // called from signal handler. Before adding something to os::abort(), make 1395 // sure it is async-safe and can handle partially initialized VM. 1396 void os::abort(bool dump_core, void* siginfo, const void* context) { 1397 os::shutdown(); 1398 if (dump_core) { 1399 #ifndef PRODUCT 1400 fdStream out(defaultStream::output_fd()); 1401 out.print_raw("Current thread is "); 1402 char buf[16]; 1403 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); 1404 out.print_raw_cr(buf); 1405 out.print_raw_cr("Dumping core ..."); 1406 #endif 1407 ::abort(); // dump core (for debugging) 1408 } 1409 1410 ::exit(1); 1411 } 1412 1413 // Die immediately, no exit hook, no abort hook, no cleanup. 1414 void os::die() { 1415 ::abort(); // dump core (for debugging) 1416 } 1417 1418 // DLL functions 1419 1420 const char* os::dll_file_extension() { return ".so"; } 1421 1422 // This must be hard coded because it's the system's temporary 1423 // directory not the java application's temp directory, ala java.io.tmpdir. 1424 const char* os::get_temp_directory() { return "/tmp"; } 1425 1426 static bool file_exists(const char* filename) { 1427 struct stat statbuf; 1428 if (filename == NULL || strlen(filename) == 0) { 1429 return false; 1430 } 1431 return os::stat(filename, &statbuf) == 0; 1432 } 1433 1434 bool os::dll_build_name(char* buffer, size_t buflen, 1435 const char* pname, const char* fname) { 1436 bool retval = false; 1437 const size_t pnamelen = pname ? strlen(pname) : 0; 1438 1439 // Return error on buffer overflow. 1440 if (pnamelen + strlen(fname) + 10 > (size_t) buflen) { 1441 return retval; 1442 } 1443 1444 if (pnamelen == 0) { 1445 snprintf(buffer, buflen, "lib%s.so", fname); 1446 retval = true; 1447 } else if (strchr(pname, *os::path_separator()) != NULL) { 1448 int n; 1449 char** pelements = split_path(pname, &n); 1450 if (pelements == NULL) { 1451 return false; 1452 } 1453 for (int i = 0; i < n; i++) { 1454 // really shouldn't be NULL but what the heck, check can't hurt 1455 if (pelements[i] == NULL || strlen(pelements[i]) == 0) { 1456 continue; // skip the empty path values 1457 } 1458 snprintf(buffer, buflen, "%s/lib%s.so", pelements[i], fname); 1459 if (file_exists(buffer)) { 1460 retval = true; 1461 break; 1462 } 1463 } 1464 // release the storage 1465 for (int i = 0; i < n; i++) { 1466 if (pelements[i] != NULL) { 1467 FREE_C_HEAP_ARRAY(char, pelements[i]); 1468 } 1469 } 1470 if (pelements != NULL) { 1471 FREE_C_HEAP_ARRAY(char*, pelements); 1472 } 1473 } else { 1474 snprintf(buffer, buflen, "%s/lib%s.so", pname, fname); 1475 retval = true; 1476 } 1477 return retval; 1478 } 1479 1480 // check if addr is inside libjvm.so 1481 bool os::address_is_in_vm(address addr) { 1482 static address libjvm_base_addr; 1483 Dl_info dlinfo; 1484 1485 if (libjvm_base_addr == NULL) { 1486 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) { 1487 libjvm_base_addr = (address)dlinfo.dli_fbase; 1488 } 1489 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); 1490 } 1491 1492 if (dladdr((void *)addr, &dlinfo) != 0) { 1493 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; 1494 } 1495 1496 return false; 1497 } 1498 1499 typedef int (*dladdr1_func_type)(void *, Dl_info *, void **, int); 1500 static dladdr1_func_type dladdr1_func = NULL; 1501 1502 bool os::dll_address_to_function_name(address addr, char *buf, 1503 int buflen, int * offset, 1504 bool demangle) { 1505 // buf is not optional, but offset is optional 1506 assert(buf != NULL, "sanity check"); 1507 1508 Dl_info dlinfo; 1509 1510 // dladdr1_func was initialized in os::init() 1511 if (dladdr1_func != NULL) { 1512 // yes, we have dladdr1 1513 1514 // Support for dladdr1 is checked at runtime; it may be 1515 // available even if the vm is built on a machine that does 1516 // not have dladdr1 support. Make sure there is a value for 1517 // RTLD_DL_SYMENT. 1518 #ifndef RTLD_DL_SYMENT 1519 #define RTLD_DL_SYMENT 1 1520 #endif 1521 #ifdef _LP64 1522 Elf64_Sym * info; 1523 #else 1524 Elf32_Sym * info; 1525 #endif 1526 if (dladdr1_func((void *)addr, &dlinfo, (void **)&info, 1527 RTLD_DL_SYMENT) != 0) { 1528 // see if we have a matching symbol that covers our address 1529 if (dlinfo.dli_saddr != NULL && 1530 (char *)dlinfo.dli_saddr + info->st_size > (char *)addr) { 1531 if (dlinfo.dli_sname != NULL) { 1532 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) { 1533 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); 1534 } 1535 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1536 return true; 1537 } 1538 } 1539 // no matching symbol so try for just file info 1540 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { 1541 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1542 buf, buflen, offset, dlinfo.dli_fname, demangle)) { 1543 return true; 1544 } 1545 } 1546 } 1547 buf[0] = '\0'; 1548 if (offset != NULL) *offset = -1; 1549 return false; 1550 } 1551 1552 // no, only dladdr is available 1553 if (dladdr((void *)addr, &dlinfo) != 0) { 1554 // see if we have a matching symbol 1555 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) { 1556 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) { 1557 jio_snprintf(buf, buflen, dlinfo.dli_sname); 1558 } 1559 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1560 return true; 1561 } 1562 // no matching symbol so try for just file info 1563 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { 1564 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1565 buf, buflen, offset, dlinfo.dli_fname, demangle)) { 1566 return true; 1567 } 1568 } 1569 } 1570 buf[0] = '\0'; 1571 if (offset != NULL) *offset = -1; 1572 return false; 1573 } 1574 1575 bool os::dll_address_to_library_name(address addr, char* buf, 1576 int buflen, int* offset) { 1577 // buf is not optional, but offset is optional 1578 assert(buf != NULL, "sanity check"); 1579 1580 Dl_info dlinfo; 1581 1582 if (dladdr((void*)addr, &dlinfo) != 0) { 1583 if (dlinfo.dli_fname != NULL) { 1584 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); 1585 } 1586 if (dlinfo.dli_fbase != NULL && offset != NULL) { 1587 *offset = addr - (address)dlinfo.dli_fbase; 1588 } 1589 return true; 1590 } 1591 1592 buf[0] = '\0'; 1593 if (offset) *offset = -1; 1594 return false; 1595 } 1596 1597 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) { 1598 Dl_info dli; 1599 // Sanity check? 1600 if (dladdr(CAST_FROM_FN_PTR(void *, os::get_loaded_modules_info), &dli) == 0 || 1601 dli.dli_fname == NULL) { 1602 return 1; 1603 } 1604 1605 void * handle = dlopen(dli.dli_fname, RTLD_LAZY); 1606 if (handle == NULL) { 1607 return 1; 1608 } 1609 1610 Link_map *map; 1611 dlinfo(handle, RTLD_DI_LINKMAP, &map); 1612 if (map == NULL) { 1613 dlclose(handle); 1614 return 1; 1615 } 1616 1617 while (map->l_prev != NULL) { 1618 map = map->l_prev; 1619 } 1620 1621 while (map != NULL) { 1622 // Iterate through all map entries and call callback with fields of interest 1623 if(callback(map->l_name, (address)map->l_addr, (address)0, param)) { 1624 dlclose(handle); 1625 return 1; 1626 } 1627 map = map->l_next; 1628 } 1629 1630 dlclose(handle); 1631 return 0; 1632 } 1633 1634 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) { 1635 outputStream * out = (outputStream *) param; 1636 out->print_cr(PTR_FORMAT " \t%s", base_address, name); 1637 return 0; 1638 } 1639 1640 void os::print_dll_info(outputStream * st) { 1641 st->print_cr("Dynamic libraries:"); st->flush(); 1642 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) { 1643 st->print_cr("Error: Cannot print dynamic libraries."); 1644 } 1645 } 1646 1647 // Loads .dll/.so and 1648 // in case of error it checks if .dll/.so was built for the 1649 // same architecture as Hotspot is running on 1650 1651 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { 1652 void * result= ::dlopen(filename, RTLD_LAZY); 1653 if (result != NULL) { 1654 // Successful loading 1655 return result; 1656 } 1657 1658 Elf32_Ehdr elf_head; 1659 1660 // Read system error message into ebuf 1661 // It may or may not be overwritten below 1662 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 1663 ebuf[ebuflen-1]='\0'; 1664 int diag_msg_max_length=ebuflen-strlen(ebuf); 1665 char* diag_msg_buf=ebuf+strlen(ebuf); 1666 1667 if (diag_msg_max_length==0) { 1668 // No more space in ebuf for additional diagnostics message 1669 return NULL; 1670 } 1671 1672 1673 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); 1674 1675 if (file_descriptor < 0) { 1676 // Can't open library, report dlerror() message 1677 return NULL; 1678 } 1679 1680 bool failed_to_read_elf_head= 1681 (sizeof(elf_head)!= 1682 (::read(file_descriptor, &elf_head,sizeof(elf_head)))); 1683 1684 ::close(file_descriptor); 1685 if (failed_to_read_elf_head) { 1686 // file i/o error - report dlerror() msg 1687 return NULL; 1688 } 1689 1690 typedef struct { 1691 Elf32_Half code; // Actual value as defined in elf.h 1692 Elf32_Half compat_class; // Compatibility of archs at VM's sense 1693 char elf_class; // 32 or 64 bit 1694 char endianess; // MSB or LSB 1695 char* name; // String representation 1696 } arch_t; 1697 1698 static const arch_t arch_array[]={ 1699 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1700 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1701 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, 1702 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, 1703 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1704 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1705 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, 1706 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, 1707 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, 1708 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM 32"} 1709 }; 1710 1711 #if (defined IA32) 1712 static Elf32_Half running_arch_code=EM_386; 1713 #elif (defined AMD64) 1714 static Elf32_Half running_arch_code=EM_X86_64; 1715 #elif (defined IA64) 1716 static Elf32_Half running_arch_code=EM_IA_64; 1717 #elif (defined __sparc) && (defined _LP64) 1718 static Elf32_Half running_arch_code=EM_SPARCV9; 1719 #elif (defined __sparc) && (!defined _LP64) 1720 static Elf32_Half running_arch_code=EM_SPARC; 1721 #elif (defined __powerpc64__) 1722 static Elf32_Half running_arch_code=EM_PPC64; 1723 #elif (defined __powerpc__) 1724 static Elf32_Half running_arch_code=EM_PPC; 1725 #elif (defined ARM) 1726 static Elf32_Half running_arch_code=EM_ARM; 1727 #else 1728 #error Method os::dll_load requires that one of following is defined:\ 1729 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, ARM 1730 #endif 1731 1732 // Identify compatability class for VM's architecture and library's architecture 1733 // Obtain string descriptions for architectures 1734 1735 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; 1736 int running_arch_index=-1; 1737 1738 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) { 1739 if (running_arch_code == arch_array[i].code) { 1740 running_arch_index = i; 1741 } 1742 if (lib_arch.code == arch_array[i].code) { 1743 lib_arch.compat_class = arch_array[i].compat_class; 1744 lib_arch.name = arch_array[i].name; 1745 } 1746 } 1747 1748 assert(running_arch_index != -1, 1749 "Didn't find running architecture code (running_arch_code) in arch_array"); 1750 if (running_arch_index == -1) { 1751 // Even though running architecture detection failed 1752 // we may still continue with reporting dlerror() message 1753 return NULL; 1754 } 1755 1756 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { 1757 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); 1758 return NULL; 1759 } 1760 1761 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { 1762 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); 1763 return NULL; 1764 } 1765 1766 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { 1767 if (lib_arch.name!=NULL) { 1768 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1769 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", 1770 lib_arch.name, arch_array[running_arch_index].name); 1771 } else { 1772 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1773 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", 1774 lib_arch.code, 1775 arch_array[running_arch_index].name); 1776 } 1777 } 1778 1779 return NULL; 1780 } 1781 1782 void* os::dll_lookup(void* handle, const char* name) { 1783 return dlsym(handle, name); 1784 } 1785 1786 void* os::get_default_process_handle() { 1787 return (void*)::dlopen(NULL, RTLD_LAZY); 1788 } 1789 1790 int os::stat(const char *path, struct stat *sbuf) { 1791 char pathbuf[MAX_PATH]; 1792 if (strlen(path) > MAX_PATH - 1) { 1793 errno = ENAMETOOLONG; 1794 return -1; 1795 } 1796 os::native_path(strcpy(pathbuf, path)); 1797 return ::stat(pathbuf, sbuf); 1798 } 1799 1800 static inline time_t get_mtime(const char* filename) { 1801 struct stat st; 1802 int ret = os::stat(filename, &st); 1803 assert(ret == 0, "failed to stat() file '%s': %s", filename, strerror(errno)); 1804 return st.st_mtime; 1805 } 1806 1807 int os::compare_file_modified_times(const char* file1, const char* file2) { 1808 time_t t1 = get_mtime(file1); 1809 time_t t2 = get_mtime(file2); 1810 return t1 - t2; 1811 } 1812 1813 static bool _print_ascii_file(const char* filename, outputStream* st) { 1814 int fd = ::open(filename, O_RDONLY); 1815 if (fd == -1) { 1816 return false; 1817 } 1818 1819 char buf[32]; 1820 int bytes; 1821 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { 1822 st->print_raw(buf, bytes); 1823 } 1824 1825 ::close(fd); 1826 1827 return true; 1828 } 1829 1830 void os::print_os_info_brief(outputStream* st) { 1831 os::Solaris::print_distro_info(st); 1832 1833 os::Posix::print_uname_info(st); 1834 1835 os::Solaris::print_libversion_info(st); 1836 } 1837 1838 void os::print_os_info(outputStream* st) { 1839 st->print("OS:"); 1840 1841 os::Solaris::print_distro_info(st); 1842 1843 os::Posix::print_uname_info(st); 1844 1845 os::Solaris::print_libversion_info(st); 1846 1847 os::Posix::print_rlimit_info(st); 1848 1849 os::Posix::print_load_average(st); 1850 } 1851 1852 void os::Solaris::print_distro_info(outputStream* st) { 1853 if (!_print_ascii_file("/etc/release", st)) { 1854 st->print("Solaris"); 1855 } 1856 st->cr(); 1857 } 1858 1859 void os::get_summary_os_info(char* buf, size_t buflen) { 1860 strncpy(buf, "Solaris", buflen); // default to plain solaris 1861 FILE* fp = fopen("/etc/release", "r"); 1862 if (fp != NULL) { 1863 char tmp[256]; 1864 // Only get the first line and chop out everything but the os name. 1865 if (fgets(tmp, sizeof(tmp), fp)) { 1866 char* ptr = tmp; 1867 // skip past whitespace characters 1868 while (*ptr != '\0' && (*ptr == ' ' || *ptr == '\t' || *ptr == '\n')) ptr++; 1869 if (*ptr != '\0') { 1870 char* nl = strchr(ptr, '\n'); 1871 if (nl != NULL) *nl = '\0'; 1872 strncpy(buf, ptr, buflen); 1873 } 1874 } 1875 fclose(fp); 1876 } 1877 } 1878 1879 void os::Solaris::print_libversion_info(outputStream* st) { 1880 st->print(" (T2 libthread)"); 1881 st->cr(); 1882 } 1883 1884 static bool check_addr0(outputStream* st) { 1885 jboolean status = false; 1886 const int read_chunk = 200; 1887 int ret = 0; 1888 int nmap = 0; 1889 int fd = ::open("/proc/self/map",O_RDONLY); 1890 if (fd >= 0) { 1891 prmap_t *p = NULL; 1892 char *mbuff = (char *) calloc(read_chunk, sizeof(prmap_t)); 1893 if (NULL == mbuff) { 1894 ::close(fd); 1895 return status; 1896 } 1897 while ((ret = ::read(fd, mbuff, read_chunk*sizeof(prmap_t))) > 0) { 1898 //check if read() has not read partial data 1899 if( 0 != ret % sizeof(prmap_t)){ 1900 break; 1901 } 1902 nmap = ret / sizeof(prmap_t); 1903 p = (prmap_t *)mbuff; 1904 for(int i = 0; i < nmap; i++){ 1905 if (p->pr_vaddr == 0x0) { 1906 st->print("Warning: Address: " PTR_FORMAT ", Size: " SIZE_FORMAT "K, ",p->pr_vaddr, p->pr_size/1024); 1907 st->print("Mapped file: %s, ", p->pr_mapname[0] == '\0' ? "None" : p->pr_mapname); 1908 st->print("Access: "); 1909 st->print("%s",(p->pr_mflags & MA_READ) ? "r" : "-"); 1910 st->print("%s",(p->pr_mflags & MA_WRITE) ? "w" : "-"); 1911 st->print("%s",(p->pr_mflags & MA_EXEC) ? "x" : "-"); 1912 st->cr(); 1913 status = true; 1914 } 1915 p++; 1916 } 1917 } 1918 free(mbuff); 1919 ::close(fd); 1920 } 1921 return status; 1922 } 1923 1924 void os::get_summary_cpu_info(char* buf, size_t buflen) { 1925 // Get MHz with system call. We don't seem to already have this. 1926 processor_info_t stats; 1927 processorid_t id = getcpuid(); 1928 int clock = 0; 1929 if (processor_info(id, &stats) != -1) { 1930 clock = stats.pi_clock; // pi_processor_type isn't more informative than below 1931 } 1932 #ifdef AMD64 1933 snprintf(buf, buflen, "x86 64 bit %d MHz", clock); 1934 #else 1935 // must be sparc 1936 snprintf(buf, buflen, "Sparcv9 64 bit %d MHz", clock); 1937 #endif 1938 } 1939 1940 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) { 1941 // Nothing to do for now. 1942 } 1943 1944 void os::print_memory_info(outputStream* st) { 1945 st->print("Memory:"); 1946 st->print(" %dk page", os::vm_page_size()>>10); 1947 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10); 1948 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10); 1949 st->cr(); 1950 (void) check_addr0(st); 1951 } 1952 1953 // Moved from whole group, because we need them here for diagnostic 1954 // prints. 1955 #define OLDMAXSIGNUM 32 1956 static int Maxsignum = 0; 1957 static int *ourSigFlags = NULL; 1958 1959 int os::Solaris::get_our_sigflags(int sig) { 1960 assert(ourSigFlags!=NULL, "signal data structure not initialized"); 1961 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range"); 1962 return ourSigFlags[sig]; 1963 } 1964 1965 void os::Solaris::set_our_sigflags(int sig, int flags) { 1966 assert(ourSigFlags!=NULL, "signal data structure not initialized"); 1967 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range"); 1968 ourSigFlags[sig] = flags; 1969 } 1970 1971 1972 static const char* get_signal_handler_name(address handler, 1973 char* buf, int buflen) { 1974 int offset; 1975 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 1976 if (found) { 1977 // skip directory names 1978 const char *p1, *p2; 1979 p1 = buf; 1980 size_t len = strlen(os::file_separator()); 1981 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 1982 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); 1983 } else { 1984 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 1985 } 1986 return buf; 1987 } 1988 1989 static void print_signal_handler(outputStream* st, int sig, 1990 char* buf, size_t buflen) { 1991 struct sigaction sa; 1992 1993 sigaction(sig, NULL, &sa); 1994 1995 st->print("%s: ", os::exception_name(sig, buf, buflen)); 1996 1997 address handler = (sa.sa_flags & SA_SIGINFO) 1998 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 1999 : CAST_FROM_FN_PTR(address, sa.sa_handler); 2000 2001 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 2002 st->print("SIG_DFL"); 2003 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 2004 st->print("SIG_IGN"); 2005 } else { 2006 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 2007 } 2008 2009 st->print(", sa_mask[0]="); 2010 os::Posix::print_signal_set_short(st, &sa.sa_mask); 2011 2012 address rh = VMError::get_resetted_sighandler(sig); 2013 // May be, handler was resetted by VMError? 2014 if (rh != NULL) { 2015 handler = rh; 2016 sa.sa_flags = VMError::get_resetted_sigflags(sig); 2017 } 2018 2019 st->print(", sa_flags="); 2020 os::Posix::print_sa_flags(st, sa.sa_flags); 2021 2022 // Check: is it our handler? 2023 if (handler == CAST_FROM_FN_PTR(address, signalHandler)) { 2024 // It is our signal handler 2025 // check for flags 2026 if (sa.sa_flags != os::Solaris::get_our_sigflags(sig)) { 2027 st->print( 2028 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", 2029 os::Solaris::get_our_sigflags(sig)); 2030 } 2031 } 2032 st->cr(); 2033 } 2034 2035 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 2036 st->print_cr("Signal Handlers:"); 2037 print_signal_handler(st, SIGSEGV, buf, buflen); 2038 print_signal_handler(st, SIGBUS , buf, buflen); 2039 print_signal_handler(st, SIGFPE , buf, buflen); 2040 print_signal_handler(st, SIGPIPE, buf, buflen); 2041 print_signal_handler(st, SIGXFSZ, buf, buflen); 2042 print_signal_handler(st, SIGILL , buf, buflen); 2043 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen); 2044 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); 2045 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen); 2046 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); 2047 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen); 2048 print_signal_handler(st, os::Solaris::SIGasync(), buf, buflen); 2049 } 2050 2051 static char saved_jvm_path[MAXPATHLEN] = { 0 }; 2052 2053 // Find the full path to the current module, libjvm.so 2054 void os::jvm_path(char *buf, jint buflen) { 2055 // Error checking. 2056 if (buflen < MAXPATHLEN) { 2057 assert(false, "must use a large-enough buffer"); 2058 buf[0] = '\0'; 2059 return; 2060 } 2061 // Lazy resolve the path to current module. 2062 if (saved_jvm_path[0] != 0) { 2063 strcpy(buf, saved_jvm_path); 2064 return; 2065 } 2066 2067 Dl_info dlinfo; 2068 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo); 2069 assert(ret != 0, "cannot locate libjvm"); 2070 if (ret != 0 && dlinfo.dli_fname != NULL) { 2071 realpath((char *)dlinfo.dli_fname, buf); 2072 } else { 2073 buf[0] = '\0'; 2074 return; 2075 } 2076 2077 if (Arguments::sun_java_launcher_is_altjvm()) { 2078 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical 2079 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so". 2080 // If "/jre/lib/" appears at the right place in the string, then 2081 // assume we are installed in a JDK and we're done. Otherwise, check 2082 // for a JAVA_HOME environment variable and fix up the path so it 2083 // looks like libjvm.so is installed there (append a fake suffix 2084 // hotspot/libjvm.so). 2085 const char *p = buf + strlen(buf) - 1; 2086 for (int count = 0; p > buf && count < 5; ++count) { 2087 for (--p; p > buf && *p != '/'; --p) 2088 /* empty */ ; 2089 } 2090 2091 if (strncmp(p, "/jre/lib/", 9) != 0) { 2092 // Look for JAVA_HOME in the environment. 2093 char* java_home_var = ::getenv("JAVA_HOME"); 2094 if (java_home_var != NULL && java_home_var[0] != 0) { 2095 char cpu_arch[12]; 2096 char* jrelib_p; 2097 int len; 2098 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch)); 2099 #ifdef _LP64 2100 // If we are on sparc running a 64-bit vm, look in jre/lib/sparcv9. 2101 if (strcmp(cpu_arch, "sparc") == 0) { 2102 strcat(cpu_arch, "v9"); 2103 } else if (strcmp(cpu_arch, "i386") == 0) { 2104 strcpy(cpu_arch, "amd64"); 2105 } 2106 #endif 2107 // Check the current module name "libjvm.so". 2108 p = strrchr(buf, '/'); 2109 assert(strstr(p, "/libjvm") == p, "invalid library name"); 2110 2111 realpath(java_home_var, buf); 2112 // determine if this is a legacy image or modules image 2113 // modules image doesn't have "jre" subdirectory 2114 len = strlen(buf); 2115 assert(len < buflen, "Ran out of buffer space"); 2116 jrelib_p = buf + len; 2117 snprintf(jrelib_p, buflen-len, "/jre/lib/%s", cpu_arch); 2118 if (0 != access(buf, F_OK)) { 2119 snprintf(jrelib_p, buflen-len, "/lib/%s", cpu_arch); 2120 } 2121 2122 if (0 == access(buf, F_OK)) { 2123 // Use current module name "libjvm.so" 2124 len = strlen(buf); 2125 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so"); 2126 } else { 2127 // Go back to path of .so 2128 realpath((char *)dlinfo.dli_fname, buf); 2129 } 2130 } 2131 } 2132 } 2133 2134 strncpy(saved_jvm_path, buf, MAXPATHLEN); 2135 saved_jvm_path[MAXPATHLEN - 1] = '\0'; 2136 } 2137 2138 2139 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 2140 // no prefix required, not even "_" 2141 } 2142 2143 2144 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 2145 // no suffix required 2146 } 2147 2148 // This method is a copy of JDK's sysGetLastErrorString 2149 // from src/solaris/hpi/src/system_md.c 2150 2151 size_t os::lasterror(char *buf, size_t len) { 2152 if (errno == 0) return 0; 2153 2154 const char *s = os::strerror(errno); 2155 size_t n = ::strlen(s); 2156 if (n >= len) { 2157 n = len - 1; 2158 } 2159 ::strncpy(buf, s, n); 2160 buf[n] = '\0'; 2161 return n; 2162 } 2163 2164 2165 // sun.misc.Signal 2166 2167 extern "C" { 2168 static void UserHandler(int sig, void *siginfo, void *context) { 2169 // Ctrl-C is pressed during error reporting, likely because the error 2170 // handler fails to abort. Let VM die immediately. 2171 if (sig == SIGINT && is_error_reported()) { 2172 os::die(); 2173 } 2174 2175 os::signal_notify(sig); 2176 // We do not need to reinstate the signal handler each time... 2177 } 2178 } 2179 2180 void* os::user_handler() { 2181 return CAST_FROM_FN_PTR(void*, UserHandler); 2182 } 2183 2184 struct timespec PosixSemaphore::create_timespec(unsigned int sec, int nsec) { 2185 struct timespec ts; 2186 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec); 2187 2188 return ts; 2189 } 2190 2191 extern "C" { 2192 typedef void (*sa_handler_t)(int); 2193 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); 2194 } 2195 2196 void* os::signal(int signal_number, void* handler) { 2197 struct sigaction sigAct, oldSigAct; 2198 sigfillset(&(sigAct.sa_mask)); 2199 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND; 2200 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); 2201 2202 if (sigaction(signal_number, &sigAct, &oldSigAct)) { 2203 // -1 means registration failed 2204 return (void *)-1; 2205 } 2206 2207 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); 2208 } 2209 2210 void os::signal_raise(int signal_number) { 2211 raise(signal_number); 2212 } 2213 2214 // The following code is moved from os.cpp for making this 2215 // code platform specific, which it is by its very nature. 2216 2217 // a counter for each possible signal value 2218 static int Sigexit = 0; 2219 static int Maxlibjsigsigs; 2220 static jint *pending_signals = NULL; 2221 static int *preinstalled_sigs = NULL; 2222 static struct sigaction *chainedsigactions = NULL; 2223 static sema_t sig_sem; 2224 typedef int (*version_getting_t)(); 2225 version_getting_t os::Solaris::get_libjsig_version = NULL; 2226 static int libjsigversion = NULL; 2227 2228 int os::sigexitnum_pd() { 2229 assert(Sigexit > 0, "signal memory not yet initialized"); 2230 return Sigexit; 2231 } 2232 2233 void os::Solaris::init_signal_mem() { 2234 // Initialize signal structures 2235 Maxsignum = SIGRTMAX; 2236 Sigexit = Maxsignum+1; 2237 assert(Maxsignum >0, "Unable to obtain max signal number"); 2238 2239 Maxlibjsigsigs = Maxsignum; 2240 2241 // pending_signals has one int per signal 2242 // The additional signal is for SIGEXIT - exit signal to signal_thread 2243 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal); 2244 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1))); 2245 2246 if (UseSignalChaining) { 2247 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction) 2248 * (Maxsignum + 1), mtInternal); 2249 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1))); 2250 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1), mtInternal); 2251 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1))); 2252 } 2253 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1), mtInternal); 2254 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1)); 2255 } 2256 2257 void os::signal_init_pd() { 2258 int ret; 2259 2260 ret = ::sema_init(&sig_sem, 0, NULL, NULL); 2261 assert(ret == 0, "sema_init() failed"); 2262 } 2263 2264 void os::signal_notify(int signal_number) { 2265 int ret; 2266 2267 Atomic::inc(&pending_signals[signal_number]); 2268 ret = ::sema_post(&sig_sem); 2269 assert(ret == 0, "sema_post() failed"); 2270 } 2271 2272 static int check_pending_signals(bool wait_for_signal) { 2273 int ret; 2274 while (true) { 2275 for (int i = 0; i < Sigexit + 1; i++) { 2276 jint n = pending_signals[i]; 2277 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 2278 return i; 2279 } 2280 } 2281 if (!wait_for_signal) { 2282 return -1; 2283 } 2284 JavaThread *thread = JavaThread::current(); 2285 ThreadBlockInVM tbivm(thread); 2286 2287 bool threadIsSuspended; 2288 do { 2289 thread->set_suspend_equivalent(); 2290 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 2291 while ((ret = ::sema_wait(&sig_sem)) == EINTR) 2292 ; 2293 assert(ret == 0, "sema_wait() failed"); 2294 2295 // were we externally suspended while we were waiting? 2296 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2297 if (threadIsSuspended) { 2298 // The semaphore has been incremented, but while we were waiting 2299 // another thread suspended us. We don't want to continue running 2300 // while suspended because that would surprise the thread that 2301 // suspended us. 2302 ret = ::sema_post(&sig_sem); 2303 assert(ret == 0, "sema_post() failed"); 2304 2305 thread->java_suspend_self(); 2306 } 2307 } while (threadIsSuspended); 2308 } 2309 } 2310 2311 int os::signal_lookup() { 2312 return check_pending_signals(false); 2313 } 2314 2315 int os::signal_wait() { 2316 return check_pending_signals(true); 2317 } 2318 2319 //////////////////////////////////////////////////////////////////////////////// 2320 // Virtual Memory 2321 2322 static int page_size = -1; 2323 2324 // The mmap MAP_ALIGN flag is supported on Solaris 9 and later. init_2() will 2325 // clear this var if support is not available. 2326 static bool has_map_align = true; 2327 2328 int os::vm_page_size() { 2329 assert(page_size != -1, "must call os::init"); 2330 return page_size; 2331 } 2332 2333 // Solaris allocates memory by pages. 2334 int os::vm_allocation_granularity() { 2335 assert(page_size != -1, "must call os::init"); 2336 return page_size; 2337 } 2338 2339 static bool recoverable_mmap_error(int err) { 2340 // See if the error is one we can let the caller handle. This 2341 // list of errno values comes from the Solaris mmap(2) man page. 2342 switch (err) { 2343 case EBADF: 2344 case EINVAL: 2345 case ENOTSUP: 2346 // let the caller deal with these errors 2347 return true; 2348 2349 default: 2350 // Any remaining errors on this OS can cause our reserved mapping 2351 // to be lost. That can cause confusion where different data 2352 // structures think they have the same memory mapped. The worst 2353 // scenario is if both the VM and a library think they have the 2354 // same memory mapped. 2355 return false; 2356 } 2357 } 2358 2359 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec, 2360 int err) { 2361 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 2362 ", %d) failed; error='%s' (errno=%d)", addr, bytes, exec, 2363 os::strerror(err), err); 2364 } 2365 2366 static void warn_fail_commit_memory(char* addr, size_t bytes, 2367 size_t alignment_hint, bool exec, 2368 int err) { 2369 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 2370 ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, bytes, 2371 alignment_hint, exec, os::strerror(err), err); 2372 } 2373 2374 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, bool exec) { 2375 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; 2376 size_t size = bytes; 2377 char *res = Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot); 2378 if (res != NULL) { 2379 if (UseNUMAInterleaving) { 2380 numa_make_global(addr, bytes); 2381 } 2382 return 0; 2383 } 2384 2385 int err = errno; // save errno from mmap() call in mmap_chunk() 2386 2387 if (!recoverable_mmap_error(err)) { 2388 warn_fail_commit_memory(addr, bytes, exec, err); 2389 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "committing reserved memory."); 2390 } 2391 2392 return err; 2393 } 2394 2395 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) { 2396 return Solaris::commit_memory_impl(addr, bytes, exec) == 0; 2397 } 2398 2399 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, bool exec, 2400 const char* mesg) { 2401 assert(mesg != NULL, "mesg must be specified"); 2402 int err = os::Solaris::commit_memory_impl(addr, bytes, exec); 2403 if (err != 0) { 2404 // the caller wants all commit errors to exit with the specified mesg: 2405 warn_fail_commit_memory(addr, bytes, exec, err); 2406 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg); 2407 } 2408 } 2409 2410 size_t os::Solaris::page_size_for_alignment(size_t alignment) { 2411 assert(is_size_aligned(alignment, (size_t) vm_page_size()), 2412 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, 2413 alignment, (size_t) vm_page_size()); 2414 2415 for (int i = 0; _page_sizes[i] != 0; i++) { 2416 if (is_size_aligned(alignment, _page_sizes[i])) { 2417 return _page_sizes[i]; 2418 } 2419 } 2420 2421 return (size_t) vm_page_size(); 2422 } 2423 2424 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, 2425 size_t alignment_hint, bool exec) { 2426 int err = Solaris::commit_memory_impl(addr, bytes, exec); 2427 if (err == 0 && UseLargePages && alignment_hint > 0) { 2428 assert(is_size_aligned(bytes, alignment_hint), 2429 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, alignment_hint); 2430 2431 // The syscall memcntl requires an exact page size (see man memcntl for details). 2432 size_t page_size = page_size_for_alignment(alignment_hint); 2433 if (page_size > (size_t) vm_page_size()) { 2434 (void)Solaris::setup_large_pages(addr, bytes, page_size); 2435 } 2436 } 2437 return err; 2438 } 2439 2440 bool os::pd_commit_memory(char* addr, size_t bytes, size_t alignment_hint, 2441 bool exec) { 2442 return Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec) == 0; 2443 } 2444 2445 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, 2446 size_t alignment_hint, bool exec, 2447 const char* mesg) { 2448 assert(mesg != NULL, "mesg must be specified"); 2449 int err = os::Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec); 2450 if (err != 0) { 2451 // the caller wants all commit errors to exit with the specified mesg: 2452 warn_fail_commit_memory(addr, bytes, alignment_hint, exec, err); 2453 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg); 2454 } 2455 } 2456 2457 // Uncommit the pages in a specified region. 2458 void os::pd_free_memory(char* addr, size_t bytes, size_t alignment_hint) { 2459 if (madvise(addr, bytes, MADV_FREE) < 0) { 2460 debug_only(warning("MADV_FREE failed.")); 2461 return; 2462 } 2463 } 2464 2465 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 2466 return os::commit_memory(addr, size, !ExecMem); 2467 } 2468 2469 bool os::remove_stack_guard_pages(char* addr, size_t size) { 2470 return os::uncommit_memory(addr, size); 2471 } 2472 2473 // Change the page size in a given range. 2474 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 2475 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned."); 2476 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned."); 2477 if (UseLargePages) { 2478 size_t page_size = Solaris::page_size_for_alignment(alignment_hint); 2479 if (page_size > (size_t) vm_page_size()) { 2480 Solaris::setup_large_pages(addr, bytes, page_size); 2481 } 2482 } 2483 } 2484 2485 // Tell the OS to make the range local to the first-touching LWP 2486 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { 2487 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned."); 2488 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) { 2489 debug_only(warning("MADV_ACCESS_LWP failed.")); 2490 } 2491 } 2492 2493 // Tell the OS that this range would be accessed from different LWPs. 2494 void os::numa_make_global(char *addr, size_t bytes) { 2495 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned."); 2496 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) { 2497 debug_only(warning("MADV_ACCESS_MANY failed.")); 2498 } 2499 } 2500 2501 // Get the number of the locality groups. 2502 size_t os::numa_get_groups_num() { 2503 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie()); 2504 return n != -1 ? n : 1; 2505 } 2506 2507 // Get a list of leaf locality groups. A leaf lgroup is group that 2508 // doesn't have any children. Typical leaf group is a CPU or a CPU/memory 2509 // board. An LWP is assigned to one of these groups upon creation. 2510 size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2511 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) { 2512 ids[0] = 0; 2513 return 1; 2514 } 2515 int result_size = 0, top = 1, bottom = 0, cur = 0; 2516 for (int k = 0; k < size; k++) { 2517 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur], 2518 (Solaris::lgrp_id_t*)&ids[top], size - top); 2519 if (r == -1) { 2520 ids[0] = 0; 2521 return 1; 2522 } 2523 if (!r) { 2524 // That's a leaf node. 2525 assert(bottom <= cur, "Sanity check"); 2526 // Check if the node has memory 2527 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur], 2528 NULL, 0, LGRP_RSRC_MEM) > 0) { 2529 ids[bottom++] = ids[cur]; 2530 } 2531 } 2532 top += r; 2533 cur++; 2534 } 2535 if (bottom == 0) { 2536 // Handle a situation, when the OS reports no memory available. 2537 // Assume UMA architecture. 2538 ids[0] = 0; 2539 return 1; 2540 } 2541 return bottom; 2542 } 2543 2544 // Detect the topology change. Typically happens during CPU plugging-unplugging. 2545 bool os::numa_topology_changed() { 2546 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie()); 2547 if (is_stale != -1 && is_stale) { 2548 Solaris::lgrp_fini(Solaris::lgrp_cookie()); 2549 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER); 2550 assert(c != 0, "Failure to initialize LGRP API"); 2551 Solaris::set_lgrp_cookie(c); 2552 return true; 2553 } 2554 return false; 2555 } 2556 2557 // Get the group id of the current LWP. 2558 int os::numa_get_group_id() { 2559 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID); 2560 if (lgrp_id == -1) { 2561 return 0; 2562 } 2563 const int size = os::numa_get_groups_num(); 2564 int *ids = (int*)alloca(size * sizeof(int)); 2565 2566 // Get the ids of all lgroups with memory; r is the count. 2567 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id, 2568 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM); 2569 if (r <= 0) { 2570 return 0; 2571 } 2572 return ids[os::random() % r]; 2573 } 2574 2575 // Request information about the page. 2576 bool os::get_page_info(char *start, page_info* info) { 2577 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE }; 2578 uint64_t addr = (uintptr_t)start; 2579 uint64_t outdata[2]; 2580 uint_t validity = 0; 2581 2582 if (os::Solaris::meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) { 2583 return false; 2584 } 2585 2586 info->size = 0; 2587 info->lgrp_id = -1; 2588 2589 if ((validity & 1) != 0) { 2590 if ((validity & 2) != 0) { 2591 info->lgrp_id = outdata[0]; 2592 } 2593 if ((validity & 4) != 0) { 2594 info->size = outdata[1]; 2595 } 2596 return true; 2597 } 2598 return false; 2599 } 2600 2601 // Scan the pages from start to end until a page different than 2602 // the one described in the info parameter is encountered. 2603 char *os::scan_pages(char *start, char* end, page_info* page_expected, 2604 page_info* page_found) { 2605 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE }; 2606 const size_t types = sizeof(info_types) / sizeof(info_types[0]); 2607 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT + 1]; 2608 uint_t validity[MAX_MEMINFO_CNT]; 2609 2610 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size); 2611 uint64_t p = (uint64_t)start; 2612 while (p < (uint64_t)end) { 2613 addrs[0] = p; 2614 size_t addrs_count = 1; 2615 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] + page_size < (uint64_t)end) { 2616 addrs[addrs_count] = addrs[addrs_count - 1] + page_size; 2617 addrs_count++; 2618 } 2619 2620 if (os::Solaris::meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) { 2621 return NULL; 2622 } 2623 2624 size_t i = 0; 2625 for (; i < addrs_count; i++) { 2626 if ((validity[i] & 1) != 0) { 2627 if ((validity[i] & 4) != 0) { 2628 if (outdata[types * i + 1] != page_expected->size) { 2629 break; 2630 } 2631 } else if (page_expected->size != 0) { 2632 break; 2633 } 2634 2635 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) { 2636 if (outdata[types * i] != page_expected->lgrp_id) { 2637 break; 2638 } 2639 } 2640 } else { 2641 return NULL; 2642 } 2643 } 2644 2645 if (i < addrs_count) { 2646 if ((validity[i] & 2) != 0) { 2647 page_found->lgrp_id = outdata[types * i]; 2648 } else { 2649 page_found->lgrp_id = -1; 2650 } 2651 if ((validity[i] & 4) != 0) { 2652 page_found->size = outdata[types * i + 1]; 2653 } else { 2654 page_found->size = 0; 2655 } 2656 return (char*)addrs[i]; 2657 } 2658 2659 p = addrs[addrs_count - 1] + page_size; 2660 } 2661 return end; 2662 } 2663 2664 bool os::pd_uncommit_memory(char* addr, size_t bytes) { 2665 size_t size = bytes; 2666 // Map uncommitted pages PROT_NONE so we fail early if we touch an 2667 // uncommitted page. Otherwise, the read/write might succeed if we 2668 // have enough swap space to back the physical page. 2669 return 2670 NULL != Solaris::mmap_chunk(addr, size, 2671 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, 2672 PROT_NONE); 2673 } 2674 2675 char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) { 2676 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0); 2677 2678 if (b == MAP_FAILED) { 2679 return NULL; 2680 } 2681 return b; 2682 } 2683 2684 char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes, 2685 size_t alignment_hint, bool fixed) { 2686 char* addr = requested_addr; 2687 int flags = MAP_PRIVATE | MAP_NORESERVE; 2688 2689 assert(!(fixed && (alignment_hint > 0)), 2690 "alignment hint meaningless with fixed mmap"); 2691 2692 if (fixed) { 2693 flags |= MAP_FIXED; 2694 } else if (has_map_align && (alignment_hint > (size_t) vm_page_size())) { 2695 flags |= MAP_ALIGN; 2696 addr = (char*) alignment_hint; 2697 } 2698 2699 // Map uncommitted pages PROT_NONE so we fail early if we touch an 2700 // uncommitted page. Otherwise, the read/write might succeed if we 2701 // have enough swap space to back the physical page. 2702 return mmap_chunk(addr, bytes, flags, PROT_NONE); 2703 } 2704 2705 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, 2706 size_t alignment_hint) { 2707 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint, 2708 (requested_addr != NULL)); 2709 2710 guarantee(requested_addr == NULL || requested_addr == addr, 2711 "OS failed to return requested mmap address."); 2712 return addr; 2713 } 2714 2715 // Reserve memory at an arbitrary address, only if that area is 2716 // available (and not reserved for something else). 2717 2718 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2719 const int max_tries = 10; 2720 char* base[max_tries]; 2721 size_t size[max_tries]; 2722 2723 // Solaris adds a gap between mmap'ed regions. The size of the gap 2724 // is dependent on the requested size and the MMU. Our initial gap 2725 // value here is just a guess and will be corrected later. 2726 bool had_top_overlap = false; 2727 bool have_adjusted_gap = false; 2728 size_t gap = 0x400000; 2729 2730 // Assert only that the size is a multiple of the page size, since 2731 // that's all that mmap requires, and since that's all we really know 2732 // about at this low abstraction level. If we need higher alignment, 2733 // we can either pass an alignment to this method or verify alignment 2734 // in one of the methods further up the call chain. See bug 5044738. 2735 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); 2736 2737 // Since snv_84, Solaris attempts to honor the address hint - see 5003415. 2738 // Give it a try, if the kernel honors the hint we can return immediately. 2739 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false); 2740 2741 volatile int err = errno; 2742 if (addr == requested_addr) { 2743 return addr; 2744 } else if (addr != NULL) { 2745 pd_unmap_memory(addr, bytes); 2746 } 2747 2748 if (log_is_enabled(Warning, os)) { 2749 char buf[256]; 2750 buf[0] = '\0'; 2751 if (addr == NULL) { 2752 jio_snprintf(buf, sizeof(buf), ": %s", os::strerror(err)); 2753 } 2754 log_info(os)("attempt_reserve_memory_at: couldn't reserve " SIZE_FORMAT " bytes at " 2755 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT 2756 "%s", bytes, requested_addr, addr, buf); 2757 } 2758 2759 // Address hint method didn't work. Fall back to the old method. 2760 // In theory, once SNV becomes our oldest supported platform, this 2761 // code will no longer be needed. 2762 // 2763 // Repeatedly allocate blocks until the block is allocated at the 2764 // right spot. Give up after max_tries. 2765 int i; 2766 for (i = 0; i < max_tries; ++i) { 2767 base[i] = reserve_memory(bytes); 2768 2769 if (base[i] != NULL) { 2770 // Is this the block we wanted? 2771 if (base[i] == requested_addr) { 2772 size[i] = bytes; 2773 break; 2774 } 2775 2776 // check that the gap value is right 2777 if (had_top_overlap && !have_adjusted_gap) { 2778 size_t actual_gap = base[i-1] - base[i] - bytes; 2779 if (gap != actual_gap) { 2780 // adjust the gap value and retry the last 2 allocations 2781 assert(i > 0, "gap adjustment code problem"); 2782 have_adjusted_gap = true; // adjust the gap only once, just in case 2783 gap = actual_gap; 2784 log_info(os)("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap); 2785 unmap_memory(base[i], bytes); 2786 unmap_memory(base[i-1], size[i-1]); 2787 i-=2; 2788 continue; 2789 } 2790 } 2791 2792 // Does this overlap the block we wanted? Give back the overlapped 2793 // parts and try again. 2794 // 2795 // There is still a bug in this code: if top_overlap == bytes, 2796 // the overlap is offset from requested region by the value of gap. 2797 // In this case giving back the overlapped part will not work, 2798 // because we'll give back the entire block at base[i] and 2799 // therefore the subsequent allocation will not generate a new gap. 2800 // This could be fixed with a new algorithm that used larger 2801 // or variable size chunks to find the requested region - 2802 // but such a change would introduce additional complications. 2803 // It's rare enough that the planets align for this bug, 2804 // so we'll just wait for a fix for 6204603/5003415 which 2805 // will provide a mmap flag to allow us to avoid this business. 2806 2807 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; 2808 if (top_overlap >= 0 && top_overlap < bytes) { 2809 had_top_overlap = true; 2810 unmap_memory(base[i], top_overlap); 2811 base[i] += top_overlap; 2812 size[i] = bytes - top_overlap; 2813 } else { 2814 size_t bottom_overlap = base[i] + bytes - requested_addr; 2815 if (bottom_overlap >= 0 && bottom_overlap < bytes) { 2816 if (bottom_overlap == 0) { 2817 log_info(os)("attempt_reserve_memory_at: possible alignment bug"); 2818 } 2819 unmap_memory(requested_addr, bottom_overlap); 2820 size[i] = bytes - bottom_overlap; 2821 } else { 2822 size[i] = bytes; 2823 } 2824 } 2825 } 2826 } 2827 2828 // Give back the unused reserved pieces. 2829 2830 for (int j = 0; j < i; ++j) { 2831 if (base[j] != NULL) { 2832 unmap_memory(base[j], size[j]); 2833 } 2834 } 2835 2836 return (i < max_tries) ? requested_addr : NULL; 2837 } 2838 2839 bool os::pd_release_memory(char* addr, size_t bytes) { 2840 size_t size = bytes; 2841 return munmap(addr, size) == 0; 2842 } 2843 2844 static bool solaris_mprotect(char* addr, size_t bytes, int prot) { 2845 assert(addr == (char*)align_size_down((uintptr_t)addr, os::vm_page_size()), 2846 "addr must be page aligned"); 2847 int retVal = mprotect(addr, bytes, prot); 2848 return retVal == 0; 2849 } 2850 2851 // Protect memory (Used to pass readonly pages through 2852 // JNI GetArray<type>Elements with empty arrays.) 2853 // Also, used for serialization page and for compressed oops null pointer 2854 // checking. 2855 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 2856 bool is_committed) { 2857 unsigned int p = 0; 2858 switch (prot) { 2859 case MEM_PROT_NONE: p = PROT_NONE; break; 2860 case MEM_PROT_READ: p = PROT_READ; break; 2861 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; 2862 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; 2863 default: 2864 ShouldNotReachHere(); 2865 } 2866 // is_committed is unused. 2867 return solaris_mprotect(addr, bytes, p); 2868 } 2869 2870 // guard_memory and unguard_memory only happens within stack guard pages. 2871 // Since ISM pertains only to the heap, guard and unguard memory should not 2872 /// happen with an ISM region. 2873 bool os::guard_memory(char* addr, size_t bytes) { 2874 return solaris_mprotect(addr, bytes, PROT_NONE); 2875 } 2876 2877 bool os::unguard_memory(char* addr, size_t bytes) { 2878 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE); 2879 } 2880 2881 // Large page support 2882 static size_t _large_page_size = 0; 2883 2884 // Insertion sort for small arrays (descending order). 2885 static void insertion_sort_descending(size_t* array, int len) { 2886 for (int i = 0; i < len; i++) { 2887 size_t val = array[i]; 2888 for (size_t key = i; key > 0 && array[key - 1] < val; --key) { 2889 size_t tmp = array[key]; 2890 array[key] = array[key - 1]; 2891 array[key - 1] = tmp; 2892 } 2893 } 2894 } 2895 2896 bool os::Solaris::mpss_sanity_check(bool warn, size_t* page_size) { 2897 const unsigned int usable_count = VM_Version::page_size_count(); 2898 if (usable_count == 1) { 2899 return false; 2900 } 2901 2902 // Find the right getpagesizes interface. When solaris 11 is the minimum 2903 // build platform, getpagesizes() (without the '2') can be called directly. 2904 typedef int (*gps_t)(size_t[], int); 2905 gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2")); 2906 if (gps_func == NULL) { 2907 gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes")); 2908 if (gps_func == NULL) { 2909 if (warn) { 2910 warning("MPSS is not supported by the operating system."); 2911 } 2912 return false; 2913 } 2914 } 2915 2916 // Fill the array of page sizes. 2917 int n = (*gps_func)(_page_sizes, page_sizes_max); 2918 assert(n > 0, "Solaris bug?"); 2919 2920 if (n == page_sizes_max) { 2921 // Add a sentinel value (necessary only if the array was completely filled 2922 // since it is static (zeroed at initialization)). 2923 _page_sizes[--n] = 0; 2924 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");) 2925 } 2926 assert(_page_sizes[n] == 0, "missing sentinel"); 2927 trace_page_sizes("available page sizes", _page_sizes, n); 2928 2929 if (n == 1) return false; // Only one page size available. 2930 2931 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and 2932 // select up to usable_count elements. First sort the array, find the first 2933 // acceptable value, then copy the usable sizes to the top of the array and 2934 // trim the rest. Make sure to include the default page size :-). 2935 // 2936 // A better policy could get rid of the 4M limit by taking the sizes of the 2937 // important VM memory regions (java heap and possibly the code cache) into 2938 // account. 2939 insertion_sort_descending(_page_sizes, n); 2940 const size_t size_limit = 2941 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes; 2942 int beg; 2943 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */; 2944 const int end = MIN2((int)usable_count, n) - 1; 2945 for (int cur = 0; cur < end; ++cur, ++beg) { 2946 _page_sizes[cur] = _page_sizes[beg]; 2947 } 2948 _page_sizes[end] = vm_page_size(); 2949 _page_sizes[end + 1] = 0; 2950 2951 if (_page_sizes[end] > _page_sizes[end - 1]) { 2952 // Default page size is not the smallest; sort again. 2953 insertion_sort_descending(_page_sizes, end + 1); 2954 } 2955 *page_size = _page_sizes[0]; 2956 2957 trace_page_sizes("usable page sizes", _page_sizes, end + 1); 2958 return true; 2959 } 2960 2961 void os::large_page_init() { 2962 if (UseLargePages) { 2963 // print a warning if any large page related flag is specified on command line 2964 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || 2965 !FLAG_IS_DEFAULT(LargePageSizeInBytes); 2966 2967 UseLargePages = Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size); 2968 } 2969 } 2970 2971 bool os::Solaris::is_valid_page_size(size_t bytes) { 2972 for (int i = 0; _page_sizes[i] != 0; i++) { 2973 if (_page_sizes[i] == bytes) { 2974 return true; 2975 } 2976 } 2977 return false; 2978 } 2979 2980 bool os::Solaris::setup_large_pages(caddr_t start, size_t bytes, size_t align) { 2981 assert(is_valid_page_size(align), SIZE_FORMAT " is not a valid page size", align); 2982 assert(is_ptr_aligned((void*) start, align), 2983 PTR_FORMAT " is not aligned to " SIZE_FORMAT, p2i((void*) start), align); 2984 assert(is_size_aligned(bytes, align), 2985 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, align); 2986 2987 // Signal to OS that we want large pages for addresses 2988 // from addr, addr + bytes 2989 struct memcntl_mha mpss_struct; 2990 mpss_struct.mha_cmd = MHA_MAPSIZE_VA; 2991 mpss_struct.mha_pagesize = align; 2992 mpss_struct.mha_flags = 0; 2993 // Upon successful completion, memcntl() returns 0 2994 if (memcntl(start, bytes, MC_HAT_ADVISE, (caddr_t) &mpss_struct, 0, 0)) { 2995 debug_only(warning("Attempt to use MPSS failed.")); 2996 return false; 2997 } 2998 return true; 2999 } 3000 3001 char* os::reserve_memory_special(size_t size, size_t alignment, char* addr, bool exec) { 3002 fatal("os::reserve_memory_special should not be called on Solaris."); 3003 return NULL; 3004 } 3005 3006 bool os::release_memory_special(char* base, size_t bytes) { 3007 fatal("os::release_memory_special should not be called on Solaris."); 3008 return false; 3009 } 3010 3011 size_t os::large_page_size() { 3012 return _large_page_size; 3013 } 3014 3015 // MPSS allows application to commit large page memory on demand; with ISM 3016 // the entire memory region must be allocated as shared memory. 3017 bool os::can_commit_large_page_memory() { 3018 return true; 3019 } 3020 3021 bool os::can_execute_large_page_memory() { 3022 return true; 3023 } 3024 3025 // Read calls from inside the vm need to perform state transitions 3026 size_t os::read(int fd, void *buf, unsigned int nBytes) { 3027 size_t res; 3028 JavaThread* thread = (JavaThread*)Thread::current(); 3029 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm"); 3030 ThreadBlockInVM tbiv(thread); 3031 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res); 3032 return res; 3033 } 3034 3035 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) { 3036 size_t res; 3037 JavaThread* thread = (JavaThread*)Thread::current(); 3038 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm"); 3039 ThreadBlockInVM tbiv(thread); 3040 RESTARTABLE(::pread(fd, buf, (size_t) nBytes, offset), res); 3041 return res; 3042 } 3043 3044 size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) { 3045 size_t res; 3046 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 3047 "Assumed _thread_in_native"); 3048 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res); 3049 return res; 3050 } 3051 3052 void os::naked_short_sleep(jlong ms) { 3053 assert(ms < 1000, "Un-interruptable sleep, short time use only"); 3054 3055 // usleep is deprecated and removed from POSIX, in favour of nanosleep, but 3056 // Solaris requires -lrt for this. 3057 usleep((ms * 1000)); 3058 3059 return; 3060 } 3061 3062 // Sleep forever; naked call to OS-specific sleep; use with CAUTION 3063 void os::infinite_sleep() { 3064 while (true) { // sleep forever ... 3065 ::sleep(100); // ... 100 seconds at a time 3066 } 3067 } 3068 3069 // Used to convert frequent JVM_Yield() to nops 3070 bool os::dont_yield() { 3071 if (DontYieldALot) { 3072 static hrtime_t last_time = 0; 3073 hrtime_t diff = getTimeNanos() - last_time; 3074 3075 if (diff < DontYieldALotInterval * 1000000) { 3076 return true; 3077 } 3078 3079 last_time += diff; 3080 3081 return false; 3082 } else { 3083 return false; 3084 } 3085 } 3086 3087 // Note that yield semantics are defined by the scheduling class to which 3088 // the thread currently belongs. Typically, yield will _not yield to 3089 // other equal or higher priority threads that reside on the dispatch queues 3090 // of other CPUs. 3091 3092 void os::naked_yield() { 3093 thr_yield(); 3094 } 3095 3096 // Interface for setting lwp priorities. If we are using T2 libthread, 3097 // which forces the use of BoundThreads or we manually set UseBoundThreads, 3098 // all of our threads will be assigned to real lwp's. Using the thr_setprio 3099 // function is meaningless in this mode so we must adjust the real lwp's priority 3100 // The routines below implement the getting and setting of lwp priorities. 3101 // 3102 // Note: T2 is now the only supported libthread. UseBoundThreads flag is 3103 // being deprecated and all threads are now BoundThreads 3104 // 3105 // Note: There are three priority scales used on Solaris. Java priotities 3106 // which range from 1 to 10, libthread "thr_setprio" scale which range 3107 // from 0 to 127, and the current scheduling class of the process we 3108 // are running in. This is typically from -60 to +60. 3109 // The setting of the lwp priorities in done after a call to thr_setprio 3110 // so Java priorities are mapped to libthread priorities and we map from 3111 // the latter to lwp priorities. We don't keep priorities stored in 3112 // Java priorities since some of our worker threads want to set priorities 3113 // higher than all Java threads. 3114 // 3115 // For related information: 3116 // (1) man -s 2 priocntl 3117 // (2) man -s 4 priocntl 3118 // (3) man dispadmin 3119 // = librt.so 3120 // = libthread/common/rtsched.c - thrp_setlwpprio(). 3121 // = ps -cL <pid> ... to validate priority. 3122 // = sched_get_priority_min and _max 3123 // pthread_create 3124 // sched_setparam 3125 // pthread_setschedparam 3126 // 3127 // Assumptions: 3128 // + We assume that all threads in the process belong to the same 3129 // scheduling class. IE. an homogenous process. 3130 // + Must be root or in IA group to change change "interactive" attribute. 3131 // Priocntl() will fail silently. The only indication of failure is when 3132 // we read-back the value and notice that it hasn't changed. 3133 // + Interactive threads enter the runq at the head, non-interactive at the tail. 3134 // + For RT, change timeslice as well. Invariant: 3135 // constant "priority integral" 3136 // Konst == TimeSlice * (60-Priority) 3137 // Given a priority, compute appropriate timeslice. 3138 // + Higher numerical values have higher priority. 3139 3140 // sched class attributes 3141 typedef struct { 3142 int schedPolicy; // classID 3143 int maxPrio; 3144 int minPrio; 3145 } SchedInfo; 3146 3147 3148 static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits; 3149 3150 #ifdef ASSERT 3151 static int ReadBackValidate = 1; 3152 #endif 3153 static int myClass = 0; 3154 static int myMin = 0; 3155 static int myMax = 0; 3156 static int myCur = 0; 3157 static bool priocntl_enable = false; 3158 3159 static const int criticalPrio = FXCriticalPriority; 3160 static int java_MaxPriority_to_os_priority = 0; // Saved mapping 3161 3162 3163 // lwp_priocntl_init 3164 // 3165 // Try to determine the priority scale for our process. 3166 // 3167 // Return errno or 0 if OK. 3168 // 3169 static int lwp_priocntl_init() { 3170 int rslt; 3171 pcinfo_t ClassInfo; 3172 pcparms_t ParmInfo; 3173 int i; 3174 3175 if (!UseThreadPriorities) return 0; 3176 3177 // If ThreadPriorityPolicy is 1, switch tables 3178 if (ThreadPriorityPolicy == 1) { 3179 for (i = 0; i < CriticalPriority+1; i++) 3180 os::java_to_os_priority[i] = prio_policy1[i]; 3181 } 3182 if (UseCriticalJavaThreadPriority) { 3183 // MaxPriority always maps to the FX scheduling class and criticalPrio. 3184 // See set_native_priority() and set_lwp_class_and_priority(). 3185 // Save original MaxPriority mapping in case attempt to 3186 // use critical priority fails. 3187 java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority]; 3188 // Set negative to distinguish from other priorities 3189 os::java_to_os_priority[MaxPriority] = -criticalPrio; 3190 } 3191 3192 // Get IDs for a set of well-known scheduling classes. 3193 // TODO-FIXME: GETCLINFO returns the current # of classes in the 3194 // the system. We should have a loop that iterates over the 3195 // classID values, which are known to be "small" integers. 3196 3197 strcpy(ClassInfo.pc_clname, "TS"); 3198 ClassInfo.pc_cid = -1; 3199 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3200 if (rslt < 0) return errno; 3201 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1"); 3202 tsLimits.schedPolicy = ClassInfo.pc_cid; 3203 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri; 3204 tsLimits.minPrio = -tsLimits.maxPrio; 3205 3206 strcpy(ClassInfo.pc_clname, "IA"); 3207 ClassInfo.pc_cid = -1; 3208 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3209 if (rslt < 0) return errno; 3210 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1"); 3211 iaLimits.schedPolicy = ClassInfo.pc_cid; 3212 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri; 3213 iaLimits.minPrio = -iaLimits.maxPrio; 3214 3215 strcpy(ClassInfo.pc_clname, "RT"); 3216 ClassInfo.pc_cid = -1; 3217 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3218 if (rslt < 0) return errno; 3219 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1"); 3220 rtLimits.schedPolicy = ClassInfo.pc_cid; 3221 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri; 3222 rtLimits.minPrio = 0; 3223 3224 strcpy(ClassInfo.pc_clname, "FX"); 3225 ClassInfo.pc_cid = -1; 3226 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3227 if (rslt < 0) return errno; 3228 assert(ClassInfo.pc_cid != -1, "cid for FX class is -1"); 3229 fxLimits.schedPolicy = ClassInfo.pc_cid; 3230 fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri; 3231 fxLimits.minPrio = 0; 3232 3233 // Query our "current" scheduling class. 3234 // This will normally be IA, TS or, rarely, FX or RT. 3235 memset(&ParmInfo, 0, sizeof(ParmInfo)); 3236 ParmInfo.pc_cid = PC_CLNULL; 3237 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo); 3238 if (rslt < 0) return errno; 3239 myClass = ParmInfo.pc_cid; 3240 3241 // We now know our scheduling classId, get specific information 3242 // about the class. 3243 ClassInfo.pc_cid = myClass; 3244 ClassInfo.pc_clname[0] = 0; 3245 rslt = priocntl((idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo); 3246 if (rslt < 0) return errno; 3247 3248 if (ThreadPriorityVerbose) { 3249 tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname); 3250 } 3251 3252 memset(&ParmInfo, 0, sizeof(pcparms_t)); 3253 ParmInfo.pc_cid = PC_CLNULL; 3254 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo); 3255 if (rslt < 0) return errno; 3256 3257 if (ParmInfo.pc_cid == rtLimits.schedPolicy) { 3258 myMin = rtLimits.minPrio; 3259 myMax = rtLimits.maxPrio; 3260 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { 3261 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms; 3262 myMin = iaLimits.minPrio; 3263 myMax = iaLimits.maxPrio; 3264 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict 3265 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { 3266 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms; 3267 myMin = tsLimits.minPrio; 3268 myMax = tsLimits.maxPrio; 3269 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict 3270 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) { 3271 fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms; 3272 myMin = fxLimits.minPrio; 3273 myMax = fxLimits.maxPrio; 3274 myMax = MIN2(myMax, (int)fxInfo->fx_uprilim); // clamp - restrict 3275 } else { 3276 // No clue - punt 3277 if (ThreadPriorityVerbose) { 3278 tty->print_cr("Unknown scheduling class: %s ... \n", 3279 ClassInfo.pc_clname); 3280 } 3281 return EINVAL; // no clue, punt 3282 } 3283 3284 if (ThreadPriorityVerbose) { 3285 tty->print_cr("Thread priority Range: [%d..%d]\n", myMin, myMax); 3286 } 3287 3288 priocntl_enable = true; // Enable changing priorities 3289 return 0; 3290 } 3291 3292 #define IAPRI(x) ((iaparms_t *)((x).pc_clparms)) 3293 #define RTPRI(x) ((rtparms_t *)((x).pc_clparms)) 3294 #define TSPRI(x) ((tsparms_t *)((x).pc_clparms)) 3295 #define FXPRI(x) ((fxparms_t *)((x).pc_clparms)) 3296 3297 3298 // scale_to_lwp_priority 3299 // 3300 // Convert from the libthread "thr_setprio" scale to our current 3301 // lwp scheduling class scale. 3302 // 3303 static int scale_to_lwp_priority(int rMin, int rMax, int x) { 3304 int v; 3305 3306 if (x == 127) return rMax; // avoid round-down 3307 v = (((x*(rMax-rMin)))/128)+rMin; 3308 return v; 3309 } 3310 3311 3312 // set_lwp_class_and_priority 3313 int set_lwp_class_and_priority(int ThreadID, int lwpid, 3314 int newPrio, int new_class, bool scale) { 3315 int rslt; 3316 int Actual, Expected, prv; 3317 pcparms_t ParmInfo; // for GET-SET 3318 #ifdef ASSERT 3319 pcparms_t ReadBack; // for readback 3320 #endif 3321 3322 // Set priority via PC_GETPARMS, update, PC_SETPARMS 3323 // Query current values. 3324 // TODO: accelerate this by eliminating the PC_GETPARMS call. 3325 // Cache "pcparms_t" in global ParmCache. 3326 // TODO: elide set-to-same-value 3327 3328 // If something went wrong on init, don't change priorities. 3329 if (!priocntl_enable) { 3330 if (ThreadPriorityVerbose) { 3331 tty->print_cr("Trying to set priority but init failed, ignoring"); 3332 } 3333 return EINVAL; 3334 } 3335 3336 // If lwp hasn't started yet, just return 3337 // the _start routine will call us again. 3338 if (lwpid <= 0) { 3339 if (ThreadPriorityVerbose) { 3340 tty->print_cr("deferring the set_lwp_class_and_priority of thread " 3341 INTPTR_FORMAT " to %d, lwpid not set", 3342 ThreadID, newPrio); 3343 } 3344 return 0; 3345 } 3346 3347 if (ThreadPriorityVerbose) { 3348 tty->print_cr ("set_lwp_class_and_priority(" 3349 INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ", 3350 ThreadID, lwpid, newPrio); 3351 } 3352 3353 memset(&ParmInfo, 0, sizeof(pcparms_t)); 3354 ParmInfo.pc_cid = PC_CLNULL; 3355 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo); 3356 if (rslt < 0) return errno; 3357 3358 int cur_class = ParmInfo.pc_cid; 3359 ParmInfo.pc_cid = (id_t)new_class; 3360 3361 if (new_class == rtLimits.schedPolicy) { 3362 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms; 3363 rtInfo->rt_pri = scale ? scale_to_lwp_priority(rtLimits.minPrio, 3364 rtLimits.maxPrio, newPrio) 3365 : newPrio; 3366 rtInfo->rt_tqsecs = RT_NOCHANGE; 3367 rtInfo->rt_tqnsecs = RT_NOCHANGE; 3368 if (ThreadPriorityVerbose) { 3369 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri); 3370 } 3371 } else if (new_class == iaLimits.schedPolicy) { 3372 iaparms_t* iaInfo = (iaparms_t*)ParmInfo.pc_clparms; 3373 int maxClamped = MIN2(iaLimits.maxPrio, 3374 cur_class == new_class 3375 ? (int)iaInfo->ia_uprilim : iaLimits.maxPrio); 3376 iaInfo->ia_upri = scale ? scale_to_lwp_priority(iaLimits.minPrio, 3377 maxClamped, newPrio) 3378 : newPrio; 3379 iaInfo->ia_uprilim = cur_class == new_class 3380 ? IA_NOCHANGE : (pri_t)iaLimits.maxPrio; 3381 iaInfo->ia_mode = IA_NOCHANGE; 3382 if (ThreadPriorityVerbose) { 3383 tty->print_cr("IA: [%d...%d] %d->%d\n", 3384 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri); 3385 } 3386 } else if (new_class == tsLimits.schedPolicy) { 3387 tsparms_t* tsInfo = (tsparms_t*)ParmInfo.pc_clparms; 3388 int maxClamped = MIN2(tsLimits.maxPrio, 3389 cur_class == new_class 3390 ? (int)tsInfo->ts_uprilim : tsLimits.maxPrio); 3391 tsInfo->ts_upri = scale ? scale_to_lwp_priority(tsLimits.minPrio, 3392 maxClamped, newPrio) 3393 : newPrio; 3394 tsInfo->ts_uprilim = cur_class == new_class 3395 ? TS_NOCHANGE : (pri_t)tsLimits.maxPrio; 3396 if (ThreadPriorityVerbose) { 3397 tty->print_cr("TS: [%d...%d] %d->%d\n", 3398 tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri); 3399 } 3400 } else if (new_class == fxLimits.schedPolicy) { 3401 fxparms_t* fxInfo = (fxparms_t*)ParmInfo.pc_clparms; 3402 int maxClamped = MIN2(fxLimits.maxPrio, 3403 cur_class == new_class 3404 ? (int)fxInfo->fx_uprilim : fxLimits.maxPrio); 3405 fxInfo->fx_upri = scale ? scale_to_lwp_priority(fxLimits.minPrio, 3406 maxClamped, newPrio) 3407 : newPrio; 3408 fxInfo->fx_uprilim = cur_class == new_class 3409 ? FX_NOCHANGE : (pri_t)fxLimits.maxPrio; 3410 fxInfo->fx_tqsecs = FX_NOCHANGE; 3411 fxInfo->fx_tqnsecs = FX_NOCHANGE; 3412 if (ThreadPriorityVerbose) { 3413 tty->print_cr("FX: [%d...%d] %d->%d\n", 3414 fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri); 3415 } 3416 } else { 3417 if (ThreadPriorityVerbose) { 3418 tty->print_cr("Unknown new scheduling class %d\n", new_class); 3419 } 3420 return EINVAL; // no clue, punt 3421 } 3422 3423 rslt = priocntl(P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo); 3424 if (ThreadPriorityVerbose && rslt) { 3425 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno); 3426 } 3427 if (rslt < 0) return errno; 3428 3429 #ifdef ASSERT 3430 // Sanity check: read back what we just attempted to set. 3431 // In theory it could have changed in the interim ... 3432 // 3433 // The priocntl system call is tricky. 3434 // Sometimes it'll validate the priority value argument and 3435 // return EINVAL if unhappy. At other times it fails silently. 3436 // Readbacks are prudent. 3437 3438 if (!ReadBackValidate) return 0; 3439 3440 memset(&ReadBack, 0, sizeof(pcparms_t)); 3441 ReadBack.pc_cid = PC_CLNULL; 3442 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack); 3443 assert(rslt >= 0, "priocntl failed"); 3444 Actual = Expected = 0xBAD; 3445 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match"); 3446 if (ParmInfo.pc_cid == rtLimits.schedPolicy) { 3447 Actual = RTPRI(ReadBack)->rt_pri; 3448 Expected = RTPRI(ParmInfo)->rt_pri; 3449 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { 3450 Actual = IAPRI(ReadBack)->ia_upri; 3451 Expected = IAPRI(ParmInfo)->ia_upri; 3452 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { 3453 Actual = TSPRI(ReadBack)->ts_upri; 3454 Expected = TSPRI(ParmInfo)->ts_upri; 3455 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) { 3456 Actual = FXPRI(ReadBack)->fx_upri; 3457 Expected = FXPRI(ParmInfo)->fx_upri; 3458 } else { 3459 if (ThreadPriorityVerbose) { 3460 tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n", 3461 ParmInfo.pc_cid); 3462 } 3463 } 3464 3465 if (Actual != Expected) { 3466 if (ThreadPriorityVerbose) { 3467 tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n", 3468 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected); 3469 } 3470 } 3471 #endif 3472 3473 return 0; 3474 } 3475 3476 // Solaris only gives access to 128 real priorities at a time, 3477 // so we expand Java's ten to fill this range. This would be better 3478 // if we dynamically adjusted relative priorities. 3479 // 3480 // The ThreadPriorityPolicy option allows us to select 2 different 3481 // priority scales. 3482 // 3483 // ThreadPriorityPolicy=0 3484 // Since the Solaris' default priority is MaximumPriority, we do not 3485 // set a priority lower than Max unless a priority lower than 3486 // NormPriority is requested. 3487 // 3488 // ThreadPriorityPolicy=1 3489 // This mode causes the priority table to get filled with 3490 // linear values. NormPriority get's mapped to 50% of the 3491 // Maximum priority an so on. This will cause VM threads 3492 // to get unfair treatment against other Solaris processes 3493 // which do not explicitly alter their thread priorities. 3494 3495 int os::java_to_os_priority[CriticalPriority + 1] = { 3496 -99999, // 0 Entry should never be used 3497 3498 0, // 1 MinPriority 3499 32, // 2 3500 64, // 3 3501 3502 96, // 4 3503 127, // 5 NormPriority 3504 127, // 6 3505 3506 127, // 7 3507 127, // 8 3508 127, // 9 NearMaxPriority 3509 3510 127, // 10 MaxPriority 3511 3512 -criticalPrio // 11 CriticalPriority 3513 }; 3514 3515 OSReturn os::set_native_priority(Thread* thread, int newpri) { 3516 OSThread* osthread = thread->osthread(); 3517 3518 // Save requested priority in case the thread hasn't been started 3519 osthread->set_native_priority(newpri); 3520 3521 // Check for critical priority request 3522 bool fxcritical = false; 3523 if (newpri == -criticalPrio) { 3524 fxcritical = true; 3525 newpri = criticalPrio; 3526 } 3527 3528 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping"); 3529 if (!UseThreadPriorities) return OS_OK; 3530 3531 int status = 0; 3532 3533 if (!fxcritical) { 3534 // Use thr_setprio only if we have a priority that thr_setprio understands 3535 status = thr_setprio(thread->osthread()->thread_id(), newpri); 3536 } 3537 3538 int lwp_status = 3539 set_lwp_class_and_priority(osthread->thread_id(), 3540 osthread->lwp_id(), 3541 newpri, 3542 fxcritical ? fxLimits.schedPolicy : myClass, 3543 !fxcritical); 3544 if (lwp_status != 0 && fxcritical) { 3545 // Try again, this time without changing the scheduling class 3546 newpri = java_MaxPriority_to_os_priority; 3547 lwp_status = set_lwp_class_and_priority(osthread->thread_id(), 3548 osthread->lwp_id(), 3549 newpri, myClass, false); 3550 } 3551 status |= lwp_status; 3552 return (status == 0) ? OS_OK : OS_ERR; 3553 } 3554 3555 3556 OSReturn os::get_native_priority(const Thread* const thread, 3557 int *priority_ptr) { 3558 int p; 3559 if (!UseThreadPriorities) { 3560 *priority_ptr = NormalPriority; 3561 return OS_OK; 3562 } 3563 int status = thr_getprio(thread->osthread()->thread_id(), &p); 3564 if (status != 0) { 3565 return OS_ERR; 3566 } 3567 *priority_ptr = p; 3568 return OS_OK; 3569 } 3570 3571 3572 // Hint to the underlying OS that a task switch would not be good. 3573 // Void return because it's a hint and can fail. 3574 void os::hint_no_preempt() { 3575 schedctl_start(schedctl_init()); 3576 } 3577 3578 static void resume_clear_context(OSThread *osthread) { 3579 osthread->set_ucontext(NULL); 3580 } 3581 3582 static void suspend_save_context(OSThread *osthread, ucontext_t* context) { 3583 osthread->set_ucontext(context); 3584 } 3585 3586 static PosixSemaphore sr_semaphore; 3587 3588 void os::Solaris::SR_handler(Thread* thread, ucontext_t* uc) { 3589 // Save and restore errno to avoid confusing native code with EINTR 3590 // after sigsuspend. 3591 int old_errno = errno; 3592 3593 OSThread* osthread = thread->osthread(); 3594 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); 3595 3596 os::SuspendResume::State current = osthread->sr.state(); 3597 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { 3598 suspend_save_context(osthread, uc); 3599 3600 // attempt to switch the state, we assume we had a SUSPEND_REQUEST 3601 os::SuspendResume::State state = osthread->sr.suspended(); 3602 if (state == os::SuspendResume::SR_SUSPENDED) { 3603 sigset_t suspend_set; // signals for sigsuspend() 3604 3605 // get current set of blocked signals and unblock resume signal 3606 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); 3607 sigdelset(&suspend_set, os::Solaris::SIGasync()); 3608 3609 sr_semaphore.signal(); 3610 // wait here until we are resumed 3611 while (1) { 3612 sigsuspend(&suspend_set); 3613 3614 os::SuspendResume::State result = osthread->sr.running(); 3615 if (result == os::SuspendResume::SR_RUNNING) { 3616 sr_semaphore.signal(); 3617 break; 3618 } 3619 } 3620 3621 } else if (state == os::SuspendResume::SR_RUNNING) { 3622 // request was cancelled, continue 3623 } else { 3624 ShouldNotReachHere(); 3625 } 3626 3627 resume_clear_context(osthread); 3628 } else if (current == os::SuspendResume::SR_RUNNING) { 3629 // request was cancelled, continue 3630 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { 3631 // ignore 3632 } else { 3633 // ignore 3634 } 3635 3636 errno = old_errno; 3637 } 3638 3639 void os::print_statistics() { 3640 } 3641 3642 bool os::message_box(const char* title, const char* message) { 3643 int i; 3644 fdStream err(defaultStream::error_fd()); 3645 for (i = 0; i < 78; i++) err.print_raw("="); 3646 err.cr(); 3647 err.print_raw_cr(title); 3648 for (i = 0; i < 78; i++) err.print_raw("-"); 3649 err.cr(); 3650 err.print_raw_cr(message); 3651 for (i = 0; i < 78; i++) err.print_raw("="); 3652 err.cr(); 3653 3654 char buf[16]; 3655 // Prevent process from exiting upon "read error" without consuming all CPU 3656 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 3657 3658 return buf[0] == 'y' || buf[0] == 'Y'; 3659 } 3660 3661 static int sr_notify(OSThread* osthread) { 3662 int status = thr_kill(osthread->thread_id(), os::Solaris::SIGasync()); 3663 assert_status(status == 0, status, "thr_kill"); 3664 return status; 3665 } 3666 3667 // "Randomly" selected value for how long we want to spin 3668 // before bailing out on suspending a thread, also how often 3669 // we send a signal to a thread we want to resume 3670 static const int RANDOMLY_LARGE_INTEGER = 1000000; 3671 static const int RANDOMLY_LARGE_INTEGER2 = 100; 3672 3673 static bool do_suspend(OSThread* osthread) { 3674 assert(osthread->sr.is_running(), "thread should be running"); 3675 assert(!sr_semaphore.trywait(), "semaphore has invalid state"); 3676 3677 // mark as suspended and send signal 3678 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { 3679 // failed to switch, state wasn't running? 3680 ShouldNotReachHere(); 3681 return false; 3682 } 3683 3684 if (sr_notify(osthread) != 0) { 3685 ShouldNotReachHere(); 3686 } 3687 3688 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED 3689 while (true) { 3690 if (sr_semaphore.timedwait(0, 2000 * NANOSECS_PER_MILLISEC)) { 3691 break; 3692 } else { 3693 // timeout 3694 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); 3695 if (cancelled == os::SuspendResume::SR_RUNNING) { 3696 return false; 3697 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { 3698 // make sure that we consume the signal on the semaphore as well 3699 sr_semaphore.wait(); 3700 break; 3701 } else { 3702 ShouldNotReachHere(); 3703 return false; 3704 } 3705 } 3706 } 3707 3708 guarantee(osthread->sr.is_suspended(), "Must be suspended"); 3709 return true; 3710 } 3711 3712 static void do_resume(OSThread* osthread) { 3713 assert(osthread->sr.is_suspended(), "thread should be suspended"); 3714 assert(!sr_semaphore.trywait(), "invalid semaphore state"); 3715 3716 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { 3717 // failed to switch to WAKEUP_REQUEST 3718 ShouldNotReachHere(); 3719 return; 3720 } 3721 3722 while (true) { 3723 if (sr_notify(osthread) == 0) { 3724 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { 3725 if (osthread->sr.is_running()) { 3726 return; 3727 } 3728 } 3729 } else { 3730 ShouldNotReachHere(); 3731 } 3732 } 3733 3734 guarantee(osthread->sr.is_running(), "Must be running!"); 3735 } 3736 3737 void os::SuspendedThreadTask::internal_do_task() { 3738 if (do_suspend(_thread->osthread())) { 3739 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); 3740 do_task(context); 3741 do_resume(_thread->osthread()); 3742 } 3743 } 3744 3745 class PcFetcher : public os::SuspendedThreadTask { 3746 public: 3747 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {} 3748 ExtendedPC result(); 3749 protected: 3750 void do_task(const os::SuspendedThreadTaskContext& context); 3751 private: 3752 ExtendedPC _epc; 3753 }; 3754 3755 ExtendedPC PcFetcher::result() { 3756 guarantee(is_done(), "task is not done yet."); 3757 return _epc; 3758 } 3759 3760 void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) { 3761 Thread* thread = context.thread(); 3762 OSThread* osthread = thread->osthread(); 3763 if (osthread->ucontext() != NULL) { 3764 _epc = os::Solaris::ucontext_get_pc((const ucontext_t *) context.ucontext()); 3765 } else { 3766 // NULL context is unexpected, double-check this is the VMThread 3767 guarantee(thread->is_VM_thread(), "can only be called for VMThread"); 3768 } 3769 } 3770 3771 // A lightweight implementation that does not suspend the target thread and 3772 // thus returns only a hint. Used for profiling only! 3773 ExtendedPC os::get_thread_pc(Thread* thread) { 3774 // Make sure that it is called by the watcher and the Threads lock is owned. 3775 assert(Thread::current()->is_Watcher_thread(), "Must be watcher and own Threads_lock"); 3776 // For now, is only used to profile the VM Thread 3777 assert(thread->is_VM_thread(), "Can only be called for VMThread"); 3778 PcFetcher fetcher(thread); 3779 fetcher.run(); 3780 return fetcher.result(); 3781 } 3782 3783 3784 // This does not do anything on Solaris. This is basically a hook for being 3785 // able to use structured exception handling (thread-local exception filters) on, e.g., Win32. 3786 void os::os_exception_wrapper(java_call_t f, JavaValue* value, 3787 const methodHandle& method, JavaCallArguments* args, 3788 Thread* thread) { 3789 f(value, method, args, thread); 3790 } 3791 3792 // This routine may be used by user applications as a "hook" to catch signals. 3793 // The user-defined signal handler must pass unrecognized signals to this 3794 // routine, and if it returns true (non-zero), then the signal handler must 3795 // return immediately. If the flag "abort_if_unrecognized" is true, then this 3796 // routine will never retun false (zero), but instead will execute a VM panic 3797 // routine kill the process. 3798 // 3799 // If this routine returns false, it is OK to call it again. This allows 3800 // the user-defined signal handler to perform checks either before or after 3801 // the VM performs its own checks. Naturally, the user code would be making 3802 // a serious error if it tried to handle an exception (such as a null check 3803 // or breakpoint) that the VM was generating for its own correct operation. 3804 // 3805 // This routine may recognize any of the following kinds of signals: 3806 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ, 3807 // os::Solaris::SIGasync 3808 // It should be consulted by handlers for any of those signals. 3809 // 3810 // The caller of this routine must pass in the three arguments supplied 3811 // to the function referred to in the "sa_sigaction" (not the "sa_handler") 3812 // field of the structure passed to sigaction(). This routine assumes that 3813 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 3814 // 3815 // Note that the VM will print warnings if it detects conflicting signal 3816 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 3817 // 3818 extern "C" JNIEXPORT int JVM_handle_solaris_signal(int signo, 3819 siginfo_t* siginfo, 3820 void* ucontext, 3821 int abort_if_unrecognized); 3822 3823 3824 void signalHandler(int sig, siginfo_t* info, void* ucVoid) { 3825 int orig_errno = errno; // Preserve errno value over signal handler. 3826 JVM_handle_solaris_signal(sig, info, ucVoid, true); 3827 errno = orig_errno; 3828 } 3829 3830 // This boolean allows users to forward their own non-matching signals 3831 // to JVM_handle_solaris_signal, harmlessly. 3832 bool os::Solaris::signal_handlers_are_installed = false; 3833 3834 // For signal-chaining 3835 bool os::Solaris::libjsig_is_loaded = false; 3836 typedef struct sigaction *(*get_signal_t)(int); 3837 get_signal_t os::Solaris::get_signal_action = NULL; 3838 3839 struct sigaction* os::Solaris::get_chained_signal_action(int sig) { 3840 struct sigaction *actp = NULL; 3841 3842 if ((libjsig_is_loaded) && (sig <= Maxlibjsigsigs)) { 3843 // Retrieve the old signal handler from libjsig 3844 actp = (*get_signal_action)(sig); 3845 } 3846 if (actp == NULL) { 3847 // Retrieve the preinstalled signal handler from jvm 3848 actp = get_preinstalled_handler(sig); 3849 } 3850 3851 return actp; 3852 } 3853 3854 static bool call_chained_handler(struct sigaction *actp, int sig, 3855 siginfo_t *siginfo, void *context) { 3856 // Call the old signal handler 3857 if (actp->sa_handler == SIG_DFL) { 3858 // It's more reasonable to let jvm treat it as an unexpected exception 3859 // instead of taking the default action. 3860 return false; 3861 } else if (actp->sa_handler != SIG_IGN) { 3862 if ((actp->sa_flags & SA_NODEFER) == 0) { 3863 // automaticlly block the signal 3864 sigaddset(&(actp->sa_mask), sig); 3865 } 3866 3867 sa_handler_t hand; 3868 sa_sigaction_t sa; 3869 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 3870 // retrieve the chained handler 3871 if (siginfo_flag_set) { 3872 sa = actp->sa_sigaction; 3873 } else { 3874 hand = actp->sa_handler; 3875 } 3876 3877 if ((actp->sa_flags & SA_RESETHAND) != 0) { 3878 actp->sa_handler = SIG_DFL; 3879 } 3880 3881 // try to honor the signal mask 3882 sigset_t oset; 3883 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); 3884 3885 // call into the chained handler 3886 if (siginfo_flag_set) { 3887 (*sa)(sig, siginfo, context); 3888 } else { 3889 (*hand)(sig); 3890 } 3891 3892 // restore the signal mask 3893 pthread_sigmask(SIG_SETMASK, &oset, 0); 3894 } 3895 // Tell jvm's signal handler the signal is taken care of. 3896 return true; 3897 } 3898 3899 bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) { 3900 bool chained = false; 3901 // signal-chaining 3902 if (UseSignalChaining) { 3903 struct sigaction *actp = get_chained_signal_action(sig); 3904 if (actp != NULL) { 3905 chained = call_chained_handler(actp, sig, siginfo, context); 3906 } 3907 } 3908 return chained; 3909 } 3910 3911 struct sigaction* os::Solaris::get_preinstalled_handler(int sig) { 3912 assert((chainedsigactions != (struct sigaction *)NULL) && 3913 (preinstalled_sigs != (int *)NULL), "signals not yet initialized"); 3914 if (preinstalled_sigs[sig] != 0) { 3915 return &chainedsigactions[sig]; 3916 } 3917 return NULL; 3918 } 3919 3920 void os::Solaris::save_preinstalled_handler(int sig, 3921 struct sigaction& oldAct) { 3922 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range"); 3923 assert((chainedsigactions != (struct sigaction *)NULL) && 3924 (preinstalled_sigs != (int *)NULL), "signals not yet initialized"); 3925 chainedsigactions[sig] = oldAct; 3926 preinstalled_sigs[sig] = 1; 3927 } 3928 3929 void os::Solaris::set_signal_handler(int sig, bool set_installed, 3930 bool oktochain) { 3931 // Check for overwrite. 3932 struct sigaction oldAct; 3933 sigaction(sig, (struct sigaction*)NULL, &oldAct); 3934 void* oldhand = 3935 oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3936 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3937 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 3938 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 3939 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) { 3940 if (AllowUserSignalHandlers || !set_installed) { 3941 // Do not overwrite; user takes responsibility to forward to us. 3942 return; 3943 } else if (UseSignalChaining) { 3944 if (oktochain) { 3945 // save the old handler in jvm 3946 save_preinstalled_handler(sig, oldAct); 3947 } else { 3948 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal."); 3949 } 3950 // libjsig also interposes the sigaction() call below and saves the 3951 // old sigaction on it own. 3952 } else { 3953 fatal("Encountered unexpected pre-existing sigaction handler " 3954 "%#lx for signal %d.", (long)oldhand, sig); 3955 } 3956 } 3957 3958 struct sigaction sigAct; 3959 sigfillset(&(sigAct.sa_mask)); 3960 sigAct.sa_handler = SIG_DFL; 3961 3962 sigAct.sa_sigaction = signalHandler; 3963 // Handle SIGSEGV on alternate signal stack if 3964 // not using stack banging 3965 if (!UseStackBanging && sig == SIGSEGV) { 3966 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK; 3967 } else { 3968 sigAct.sa_flags = SA_SIGINFO | SA_RESTART; 3969 } 3970 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags); 3971 3972 sigaction(sig, &sigAct, &oldAct); 3973 3974 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3975 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3976 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 3977 } 3978 3979 3980 #define DO_SIGNAL_CHECK(sig) \ 3981 do { \ 3982 if (!sigismember(&check_signal_done, sig)) { \ 3983 os::Solaris::check_signal_handler(sig); \ 3984 } \ 3985 } while (0) 3986 3987 // This method is a periodic task to check for misbehaving JNI applications 3988 // under CheckJNI, we can add any periodic checks here 3989 3990 void os::run_periodic_checks() { 3991 // A big source of grief is hijacking virt. addr 0x0 on Solaris, 3992 // thereby preventing a NULL checks. 3993 if (!check_addr0_done) check_addr0_done = check_addr0(tty); 3994 3995 if (check_signals == false) return; 3996 3997 // SEGV and BUS if overridden could potentially prevent 3998 // generation of hs*.log in the event of a crash, debugging 3999 // such a case can be very challenging, so we absolutely 4000 // check for the following for a good measure: 4001 DO_SIGNAL_CHECK(SIGSEGV); 4002 DO_SIGNAL_CHECK(SIGILL); 4003 DO_SIGNAL_CHECK(SIGFPE); 4004 DO_SIGNAL_CHECK(SIGBUS); 4005 DO_SIGNAL_CHECK(SIGPIPE); 4006 DO_SIGNAL_CHECK(SIGXFSZ); 4007 4008 // ReduceSignalUsage allows the user to override these handlers 4009 // see comments at the very top and jvm_solaris.h 4010 if (!ReduceSignalUsage) { 4011 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 4012 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 4013 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 4014 DO_SIGNAL_CHECK(BREAK_SIGNAL); 4015 } 4016 4017 // See comments above for using JVM1/JVM2 4018 DO_SIGNAL_CHECK(os::Solaris::SIGasync()); 4019 4020 } 4021 4022 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 4023 4024 static os_sigaction_t os_sigaction = NULL; 4025 4026 void os::Solaris::check_signal_handler(int sig) { 4027 char buf[O_BUFLEN]; 4028 address jvmHandler = NULL; 4029 4030 struct sigaction act; 4031 if (os_sigaction == NULL) { 4032 // only trust the default sigaction, in case it has been interposed 4033 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); 4034 if (os_sigaction == NULL) return; 4035 } 4036 4037 os_sigaction(sig, (struct sigaction*)NULL, &act); 4038 4039 address thisHandler = (act.sa_flags & SA_SIGINFO) 4040 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 4041 : CAST_FROM_FN_PTR(address, act.sa_handler); 4042 4043 4044 switch (sig) { 4045 case SIGSEGV: 4046 case SIGBUS: 4047 case SIGFPE: 4048 case SIGPIPE: 4049 case SIGXFSZ: 4050 case SIGILL: 4051 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler); 4052 break; 4053 4054 case SHUTDOWN1_SIGNAL: 4055 case SHUTDOWN2_SIGNAL: 4056 case SHUTDOWN3_SIGNAL: 4057 case BREAK_SIGNAL: 4058 jvmHandler = (address)user_handler(); 4059 break; 4060 4061 default: 4062 int asynsig = os::Solaris::SIGasync(); 4063 4064 if (sig == asynsig) { 4065 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler); 4066 } else { 4067 return; 4068 } 4069 break; 4070 } 4071 4072 4073 if (thisHandler != jvmHandler) { 4074 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 4075 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 4076 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 4077 // No need to check this sig any longer 4078 sigaddset(&check_signal_done, sig); 4079 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN 4080 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) { 4081 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell", 4082 exception_name(sig, buf, O_BUFLEN)); 4083 } 4084 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) { 4085 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 4086 tty->print("expected:"); 4087 os::Posix::print_sa_flags(tty, os::Solaris::get_our_sigflags(sig)); 4088 tty->cr(); 4089 tty->print(" found:"); 4090 os::Posix::print_sa_flags(tty, act.sa_flags); 4091 tty->cr(); 4092 // No need to check this sig any longer 4093 sigaddset(&check_signal_done, sig); 4094 } 4095 4096 // Print all the signal handler state 4097 if (sigismember(&check_signal_done, sig)) { 4098 print_signal_handlers(tty, buf, O_BUFLEN); 4099 } 4100 4101 } 4102 4103 void os::Solaris::install_signal_handlers() { 4104 bool libjsigdone = false; 4105 signal_handlers_are_installed = true; 4106 4107 // signal-chaining 4108 typedef void (*signal_setting_t)(); 4109 signal_setting_t begin_signal_setting = NULL; 4110 signal_setting_t end_signal_setting = NULL; 4111 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 4112 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 4113 if (begin_signal_setting != NULL) { 4114 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 4115 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 4116 get_signal_action = CAST_TO_FN_PTR(get_signal_t, 4117 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 4118 get_libjsig_version = CAST_TO_FN_PTR(version_getting_t, 4119 dlsym(RTLD_DEFAULT, "JVM_get_libjsig_version")); 4120 libjsig_is_loaded = true; 4121 if (os::Solaris::get_libjsig_version != NULL) { 4122 libjsigversion = (*os::Solaris::get_libjsig_version)(); 4123 } 4124 assert(UseSignalChaining, "should enable signal-chaining"); 4125 } 4126 if (libjsig_is_loaded) { 4127 // Tell libjsig jvm is setting signal handlers 4128 (*begin_signal_setting)(); 4129 } 4130 4131 set_signal_handler(SIGSEGV, true, true); 4132 set_signal_handler(SIGPIPE, true, true); 4133 set_signal_handler(SIGXFSZ, true, true); 4134 set_signal_handler(SIGBUS, true, true); 4135 set_signal_handler(SIGILL, true, true); 4136 set_signal_handler(SIGFPE, true, true); 4137 4138 4139 if (os::Solaris::SIGasync() > OLDMAXSIGNUM) { 4140 // Pre-1.4.1 Libjsig limited to signal chaining signals <= 32 so 4141 // can not register overridable signals which might be > 32 4142 if (libjsig_is_loaded && libjsigversion <= JSIG_VERSION_1_4_1) { 4143 // Tell libjsig jvm has finished setting signal handlers 4144 (*end_signal_setting)(); 4145 libjsigdone = true; 4146 } 4147 } 4148 4149 set_signal_handler(os::Solaris::SIGasync(), true, true); 4150 4151 if (libjsig_is_loaded && !libjsigdone) { 4152 // Tell libjsig jvm finishes setting signal handlers 4153 (*end_signal_setting)(); 4154 } 4155 4156 // We don't activate signal checker if libjsig is in place, we trust ourselves 4157 // and if UserSignalHandler is installed all bets are off. 4158 // Log that signal checking is off only if -verbose:jni is specified. 4159 if (CheckJNICalls) { 4160 if (libjsig_is_loaded) { 4161 if (PrintJNIResolving) { 4162 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); 4163 } 4164 check_signals = false; 4165 } 4166 if (AllowUserSignalHandlers) { 4167 if (PrintJNIResolving) { 4168 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 4169 } 4170 check_signals = false; 4171 } 4172 } 4173 } 4174 4175 4176 void report_error(const char* file_name, int line_no, const char* title, 4177 const char* format, ...); 4178 4179 // (Static) wrapper for getisax(2) call. 4180 os::Solaris::getisax_func_t os::Solaris::_getisax = 0; 4181 4182 // (Static) wrappers for the liblgrp API 4183 os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home; 4184 os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init; 4185 os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini; 4186 os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root; 4187 os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children; 4188 os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources; 4189 os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps; 4190 os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale; 4191 os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0; 4192 4193 // (Static) wrapper for meminfo() call. 4194 os::Solaris::meminfo_func_t os::Solaris::_meminfo = 0; 4195 4196 static address resolve_symbol_lazy(const char* name) { 4197 address addr = (address) dlsym(RTLD_DEFAULT, name); 4198 if (addr == NULL) { 4199 // RTLD_DEFAULT was not defined on some early versions of 2.5.1 4200 addr = (address) dlsym(RTLD_NEXT, name); 4201 } 4202 return addr; 4203 } 4204 4205 static address resolve_symbol(const char* name) { 4206 address addr = resolve_symbol_lazy(name); 4207 if (addr == NULL) { 4208 fatal(dlerror()); 4209 } 4210 return addr; 4211 } 4212 4213 void os::Solaris::libthread_init() { 4214 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators"); 4215 4216 lwp_priocntl_init(); 4217 4218 // RTLD_DEFAULT was not defined on some early versions of 5.5.1 4219 if (func == NULL) { 4220 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators"); 4221 // Guarantee that this VM is running on an new enough OS (5.6 or 4222 // later) that it will have a new enough libthread.so. 4223 guarantee(func != NULL, "libthread.so is too old."); 4224 } 4225 4226 int size; 4227 void (*handler_info_func)(address *, int *); 4228 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo")); 4229 handler_info_func(&handler_start, &size); 4230 handler_end = handler_start + size; 4231 } 4232 4233 4234 int_fnP_mutex_tP os::Solaris::_mutex_lock; 4235 int_fnP_mutex_tP os::Solaris::_mutex_trylock; 4236 int_fnP_mutex_tP os::Solaris::_mutex_unlock; 4237 int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init; 4238 int_fnP_mutex_tP os::Solaris::_mutex_destroy; 4239 int os::Solaris::_mutex_scope = USYNC_THREAD; 4240 4241 int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait; 4242 int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait; 4243 int_fnP_cond_tP os::Solaris::_cond_signal; 4244 int_fnP_cond_tP os::Solaris::_cond_broadcast; 4245 int_fnP_cond_tP_i_vP os::Solaris::_cond_init; 4246 int_fnP_cond_tP os::Solaris::_cond_destroy; 4247 int os::Solaris::_cond_scope = USYNC_THREAD; 4248 4249 void os::Solaris::synchronization_init() { 4250 if (UseLWPSynchronization) { 4251 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock"))); 4252 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock"))); 4253 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock"))); 4254 os::Solaris::set_mutex_init(lwp_mutex_init); 4255 os::Solaris::set_mutex_destroy(lwp_mutex_destroy); 4256 os::Solaris::set_mutex_scope(USYNC_THREAD); 4257 4258 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait"))); 4259 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait"))); 4260 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal"))); 4261 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast"))); 4262 os::Solaris::set_cond_init(lwp_cond_init); 4263 os::Solaris::set_cond_destroy(lwp_cond_destroy); 4264 os::Solaris::set_cond_scope(USYNC_THREAD); 4265 } else { 4266 os::Solaris::set_mutex_scope(USYNC_THREAD); 4267 os::Solaris::set_cond_scope(USYNC_THREAD); 4268 4269 if (UsePthreads) { 4270 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock"))); 4271 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock"))); 4272 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock"))); 4273 os::Solaris::set_mutex_init(pthread_mutex_default_init); 4274 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy"))); 4275 4276 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait"))); 4277 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait"))); 4278 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal"))); 4279 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast"))); 4280 os::Solaris::set_cond_init(pthread_cond_default_init); 4281 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy"))); 4282 } else { 4283 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock"))); 4284 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock"))); 4285 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock"))); 4286 os::Solaris::set_mutex_init(::mutex_init); 4287 os::Solaris::set_mutex_destroy(::mutex_destroy); 4288 4289 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait"))); 4290 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait"))); 4291 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal"))); 4292 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast"))); 4293 os::Solaris::set_cond_init(::cond_init); 4294 os::Solaris::set_cond_destroy(::cond_destroy); 4295 } 4296 } 4297 } 4298 4299 bool os::Solaris::liblgrp_init() { 4300 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY); 4301 if (handle != NULL) { 4302 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home"))); 4303 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init"))); 4304 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini"))); 4305 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root"))); 4306 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children"))); 4307 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources"))); 4308 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps"))); 4309 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t, 4310 dlsym(handle, "lgrp_cookie_stale"))); 4311 4312 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER); 4313 set_lgrp_cookie(c); 4314 return true; 4315 } 4316 return false; 4317 } 4318 4319 void os::Solaris::misc_sym_init() { 4320 address func; 4321 4322 // getisax 4323 func = resolve_symbol_lazy("getisax"); 4324 if (func != NULL) { 4325 os::Solaris::_getisax = CAST_TO_FN_PTR(getisax_func_t, func); 4326 } 4327 4328 // meminfo 4329 func = resolve_symbol_lazy("meminfo"); 4330 if (func != NULL) { 4331 os::Solaris::set_meminfo(CAST_TO_FN_PTR(meminfo_func_t, func)); 4332 } 4333 } 4334 4335 uint_t os::Solaris::getisax(uint32_t* array, uint_t n) { 4336 assert(_getisax != NULL, "_getisax not set"); 4337 return _getisax(array, n); 4338 } 4339 4340 // int pset_getloadavg(psetid_t pset, double loadavg[], int nelem); 4341 typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem); 4342 static pset_getloadavg_type pset_getloadavg_ptr = NULL; 4343 4344 void init_pset_getloadavg_ptr(void) { 4345 pset_getloadavg_ptr = 4346 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg"); 4347 if (pset_getloadavg_ptr == NULL) { 4348 log_warning(os)("pset_getloadavg function not found"); 4349 } 4350 } 4351 4352 int os::Solaris::_dev_zero_fd = -1; 4353 4354 // this is called _before_ the global arguments have been parsed 4355 void os::init(void) { 4356 _initial_pid = getpid(); 4357 4358 max_hrtime = first_hrtime = gethrtime(); 4359 4360 init_random(1234567); 4361 4362 page_size = sysconf(_SC_PAGESIZE); 4363 if (page_size == -1) { 4364 fatal("os_solaris.cpp: os::init: sysconf failed (%s)", os::strerror(errno)); 4365 } 4366 init_page_sizes((size_t) page_size); 4367 4368 Solaris::initialize_system_info(); 4369 4370 // Initialize misc. symbols as soon as possible, so we can use them 4371 // if we need them. 4372 Solaris::misc_sym_init(); 4373 4374 int fd = ::open("/dev/zero", O_RDWR); 4375 if (fd < 0) { 4376 fatal("os::init: cannot open /dev/zero (%s)", os::strerror(errno)); 4377 } else { 4378 Solaris::set_dev_zero_fd(fd); 4379 4380 // Close on exec, child won't inherit. 4381 fcntl(fd, F_SETFD, FD_CLOEXEC); 4382 } 4383 4384 clock_tics_per_sec = CLK_TCK; 4385 4386 // check if dladdr1() exists; dladdr1 can provide more information than 4387 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9 4388 // and is available on linker patches for 5.7 and 5.8. 4389 // libdl.so must have been loaded, this call is just an entry lookup 4390 void * hdl = dlopen("libdl.so", RTLD_NOW); 4391 if (hdl) { 4392 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1")); 4393 } 4394 4395 // (Solaris only) this switches to calls that actually do locking. 4396 ThreadCritical::initialize(); 4397 4398 main_thread = thr_self(); 4399 4400 // Constant minimum stack size allowed. It must be at least 4401 // the minimum of what the OS supports (thr_min_stack()), and 4402 // enough to allow the thread to get to user bytecode execution. 4403 Solaris::min_stack_allowed = MAX2(thr_min_stack(), Solaris::min_stack_allowed); 4404 4405 // dynamic lookup of functions that may not be available in our lowest 4406 // supported Solaris release 4407 void * handle = dlopen("libc.so.1", RTLD_LAZY); 4408 if (handle != NULL) { 4409 Solaris::_pthread_setname_np = // from 11.3 4410 (Solaris::pthread_setname_np_func_t)dlsym(handle, "pthread_setname_np"); 4411 } 4412 } 4413 4414 // To install functions for atexit system call 4415 extern "C" { 4416 static void perfMemory_exit_helper() { 4417 perfMemory_exit(); 4418 } 4419 } 4420 4421 // this is called _after_ the global arguments have been parsed 4422 jint os::init_2(void) { 4423 // try to enable extended file IO ASAP, see 6431278 4424 os::Solaris::try_enable_extended_io(); 4425 4426 // Allocate a single page and mark it as readable for safepoint polling. Also 4427 // use this first mmap call to check support for MAP_ALIGN. 4428 address polling_page = (address)Solaris::mmap_chunk((char*)page_size, 4429 page_size, 4430 MAP_PRIVATE | MAP_ALIGN, 4431 PROT_READ); 4432 if (polling_page == NULL) { 4433 has_map_align = false; 4434 polling_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE, 4435 PROT_READ); 4436 } 4437 4438 os::set_polling_page(polling_page); 4439 log_info(os)("SafePoint Polling address: " INTPTR_FORMAT, p2i(polling_page)); 4440 4441 if (!UseMembar) { 4442 address mem_serialize_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE, PROT_READ | PROT_WRITE); 4443 guarantee(mem_serialize_page != NULL, "mmap Failed for memory serialize page"); 4444 os::set_memory_serialize_page(mem_serialize_page); 4445 log_info(os)("Memory Serialize Page address: " INTPTR_FORMAT, p2i(mem_serialize_page)); 4446 } 4447 4448 // Check minimum allowable stack size for thread creation and to initialize 4449 // the java system classes, including StackOverflowError - depends on page 4450 // size. Add two 4K pages for compiler2 recursion in main thread. 4451 // Add in 4*BytesPerWord 4K pages to account for VM stack during 4452 // class initialization depending on 32 or 64 bit VM. 4453 os::Solaris::min_stack_allowed = MAX2(os::Solaris::min_stack_allowed, 4454 JavaThread::stack_guard_zone_size() + 4455 JavaThread::stack_shadow_zone_size() + 4456 (4*BytesPerWord COMPILER2_PRESENT(+2)) * 4 * K); 4457 4458 os::Solaris::min_stack_allowed = align_size_up(os::Solaris::min_stack_allowed, os::vm_page_size()); 4459 4460 size_t threadStackSizeInBytes = ThreadStackSize * K; 4461 if (threadStackSizeInBytes != 0 && 4462 threadStackSizeInBytes < os::Solaris::min_stack_allowed) { 4463 tty->print_cr("\nThe stack size specified is too small, Specify at least %dk", 4464 os::Solaris::min_stack_allowed/K); 4465 return JNI_ERR; 4466 } 4467 4468 // For 64kbps there will be a 64kb page size, which makes 4469 // the usable default stack size quite a bit less. Increase the 4470 // stack for 64kb (or any > than 8kb) pages, this increases 4471 // virtual memory fragmentation (since we're not creating the 4472 // stack on a power of 2 boundary. The real fix for this 4473 // should be to fix the guard page mechanism. 4474 4475 if (vm_page_size() > 8*K) { 4476 threadStackSizeInBytes = (threadStackSizeInBytes != 0) 4477 ? threadStackSizeInBytes + 4478 JavaThread::stack_red_zone_size() + 4479 JavaThread::stack_yellow_zone_size() 4480 : 0; 4481 ThreadStackSize = threadStackSizeInBytes/K; 4482 } 4483 4484 // Make the stack size a multiple of the page size so that 4485 // the yellow/red zones can be guarded. 4486 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, 4487 vm_page_size())); 4488 4489 Solaris::libthread_init(); 4490 4491 if (UseNUMA) { 4492 if (!Solaris::liblgrp_init()) { 4493 UseNUMA = false; 4494 } else { 4495 size_t lgrp_limit = os::numa_get_groups_num(); 4496 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtInternal); 4497 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit); 4498 FREE_C_HEAP_ARRAY(int, lgrp_ids); 4499 if (lgrp_num < 2) { 4500 // There's only one locality group, disable NUMA. 4501 UseNUMA = false; 4502 } 4503 } 4504 if (!UseNUMA && ForceNUMA) { 4505 UseNUMA = true; 4506 } 4507 } 4508 4509 Solaris::signal_sets_init(); 4510 Solaris::init_signal_mem(); 4511 Solaris::install_signal_handlers(); 4512 4513 if (libjsigversion < JSIG_VERSION_1_4_1) { 4514 Maxlibjsigsigs = OLDMAXSIGNUM; 4515 } 4516 4517 // initialize synchronization primitives to use either thread or 4518 // lwp synchronization (controlled by UseLWPSynchronization) 4519 Solaris::synchronization_init(); 4520 4521 if (MaxFDLimit) { 4522 // set the number of file descriptors to max. print out error 4523 // if getrlimit/setrlimit fails but continue regardless. 4524 struct rlimit nbr_files; 4525 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 4526 if (status != 0) { 4527 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno)); 4528 } else { 4529 nbr_files.rlim_cur = nbr_files.rlim_max; 4530 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 4531 if (status != 0) { 4532 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno)); 4533 } 4534 } 4535 } 4536 4537 // Calculate theoretical max. size of Threads to guard gainst 4538 // artifical out-of-memory situations, where all available address- 4539 // space has been reserved by thread stacks. Default stack size is 1Mb. 4540 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ? 4541 JavaThread::stack_size_at_create() : (1*K*K); 4542 assert(pre_thread_stack_size != 0, "Must have a stack"); 4543 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when 4544 // we should start doing Virtual Memory banging. Currently when the threads will 4545 // have used all but 200Mb of space. 4546 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K); 4547 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size; 4548 4549 // at-exit methods are called in the reverse order of their registration. 4550 // In Solaris 7 and earlier, atexit functions are called on return from 4551 // main or as a result of a call to exit(3C). There can be only 32 of 4552 // these functions registered and atexit() does not set errno. In Solaris 4553 // 8 and later, there is no limit to the number of functions registered 4554 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit 4555 // functions are called upon dlclose(3DL) in addition to return from main 4556 // and exit(3C). 4557 4558 if (PerfAllowAtExitRegistration) { 4559 // only register atexit functions if PerfAllowAtExitRegistration is set. 4560 // atexit functions can be delayed until process exit time, which 4561 // can be problematic for embedded VM situations. Embedded VMs should 4562 // call DestroyJavaVM() to assure that VM resources are released. 4563 4564 // note: perfMemory_exit_helper atexit function may be removed in 4565 // the future if the appropriate cleanup code can be added to the 4566 // VM_Exit VMOperation's doit method. 4567 if (atexit(perfMemory_exit_helper) != 0) { 4568 warning("os::init2 atexit(perfMemory_exit_helper) failed"); 4569 } 4570 } 4571 4572 // Init pset_loadavg function pointer 4573 init_pset_getloadavg_ptr(); 4574 4575 return JNI_OK; 4576 } 4577 4578 // Mark the polling page as unreadable 4579 void os::make_polling_page_unreadable(void) { 4580 if (mprotect((char *)_polling_page, page_size, PROT_NONE) != 0) { 4581 fatal("Could not disable polling page"); 4582 } 4583 } 4584 4585 // Mark the polling page as readable 4586 void os::make_polling_page_readable(void) { 4587 if (mprotect((char *)_polling_page, page_size, PROT_READ) != 0) { 4588 fatal("Could not enable polling page"); 4589 } 4590 } 4591 4592 // Is a (classpath) directory empty? 4593 bool os::dir_is_empty(const char* path) { 4594 DIR *dir = NULL; 4595 struct dirent *ptr; 4596 4597 dir = opendir(path); 4598 if (dir == NULL) return true; 4599 4600 // Scan the directory 4601 bool result = true; 4602 char buf[sizeof(struct dirent) + MAX_PATH]; 4603 struct dirent *dbuf = (struct dirent *) buf; 4604 while (result && (ptr = readdir(dir, dbuf)) != NULL) { 4605 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 4606 result = false; 4607 } 4608 } 4609 closedir(dir); 4610 return result; 4611 } 4612 4613 // This code originates from JDK's sysOpen and open64_w 4614 // from src/solaris/hpi/src/system_md.c 4615 4616 int os::open(const char *path, int oflag, int mode) { 4617 if (strlen(path) > MAX_PATH - 1) { 4618 errno = ENAMETOOLONG; 4619 return -1; 4620 } 4621 int fd; 4622 4623 fd = ::open64(path, oflag, mode); 4624 if (fd == -1) return -1; 4625 4626 // If the open succeeded, the file might still be a directory 4627 { 4628 struct stat64 buf64; 4629 int ret = ::fstat64(fd, &buf64); 4630 int st_mode = buf64.st_mode; 4631 4632 if (ret != -1) { 4633 if ((st_mode & S_IFMT) == S_IFDIR) { 4634 errno = EISDIR; 4635 ::close(fd); 4636 return -1; 4637 } 4638 } else { 4639 ::close(fd); 4640 return -1; 4641 } 4642 } 4643 4644 // 32-bit Solaris systems suffer from: 4645 // 4646 // - an historical default soft limit of 256 per-process file 4647 // descriptors that is too low for many Java programs. 4648 // 4649 // - a design flaw where file descriptors created using stdio 4650 // fopen must be less than 256, _even_ when the first limit above 4651 // has been raised. This can cause calls to fopen (but not calls to 4652 // open, for example) to fail mysteriously, perhaps in 3rd party 4653 // native code (although the JDK itself uses fopen). One can hardly 4654 // criticize them for using this most standard of all functions. 4655 // 4656 // We attempt to make everything work anyways by: 4657 // 4658 // - raising the soft limit on per-process file descriptors beyond 4659 // 256 4660 // 4661 // - As of Solaris 10u4, we can request that Solaris raise the 256 4662 // stdio fopen limit by calling function enable_extended_FILE_stdio. 4663 // This is done in init_2 and recorded in enabled_extended_FILE_stdio 4664 // 4665 // - If we are stuck on an old (pre 10u4) Solaris system, we can 4666 // workaround the bug by remapping non-stdio file descriptors below 4667 // 256 to ones beyond 256, which is done below. 4668 // 4669 // See: 4670 // 1085341: 32-bit stdio routines should support file descriptors >255 4671 // 6533291: Work around 32-bit Solaris stdio limit of 256 open files 4672 // 6431278: Netbeans crash on 32 bit Solaris: need to call 4673 // enable_extended_FILE_stdio() in VM initialisation 4674 // Giri Mandalika's blog 4675 // http://technopark02.blogspot.com/2005_05_01_archive.html 4676 // 4677 #ifndef _LP64 4678 if ((!enabled_extended_FILE_stdio) && fd < 256) { 4679 int newfd = ::fcntl(fd, F_DUPFD, 256); 4680 if (newfd != -1) { 4681 ::close(fd); 4682 fd = newfd; 4683 } 4684 } 4685 #endif // 32-bit Solaris 4686 4687 // All file descriptors that are opened in the JVM and not 4688 // specifically destined for a subprocess should have the 4689 // close-on-exec flag set. If we don't set it, then careless 3rd 4690 // party native code might fork and exec without closing all 4691 // appropriate file descriptors (e.g. as we do in closeDescriptors in 4692 // UNIXProcess.c), and this in turn might: 4693 // 4694 // - cause end-of-file to fail to be detected on some file 4695 // descriptors, resulting in mysterious hangs, or 4696 // 4697 // - might cause an fopen in the subprocess to fail on a system 4698 // suffering from bug 1085341. 4699 // 4700 // (Yes, the default setting of the close-on-exec flag is a Unix 4701 // design flaw) 4702 // 4703 // See: 4704 // 1085341: 32-bit stdio routines should support file descriptors >255 4705 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed 4706 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 4707 // 4708 #ifdef FD_CLOEXEC 4709 { 4710 int flags = ::fcntl(fd, F_GETFD); 4711 if (flags != -1) { 4712 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); 4713 } 4714 } 4715 #endif 4716 4717 return fd; 4718 } 4719 4720 // create binary file, rewriting existing file if required 4721 int os::create_binary_file(const char* path, bool rewrite_existing) { 4722 int oflags = O_WRONLY | O_CREAT; 4723 if (!rewrite_existing) { 4724 oflags |= O_EXCL; 4725 } 4726 return ::open64(path, oflags, S_IREAD | S_IWRITE); 4727 } 4728 4729 // return current position of file pointer 4730 jlong os::current_file_offset(int fd) { 4731 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR); 4732 } 4733 4734 // move file pointer to the specified offset 4735 jlong os::seek_to_file_offset(int fd, jlong offset) { 4736 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET); 4737 } 4738 4739 jlong os::lseek(int fd, jlong offset, int whence) { 4740 return (jlong) ::lseek64(fd, offset, whence); 4741 } 4742 4743 char * os::native_path(char *path) { 4744 return path; 4745 } 4746 4747 int os::ftruncate(int fd, jlong length) { 4748 return ::ftruncate64(fd, length); 4749 } 4750 4751 int os::fsync(int fd) { 4752 RESTARTABLE_RETURN_INT(::fsync(fd)); 4753 } 4754 4755 int os::available(int fd, jlong *bytes) { 4756 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 4757 "Assumed _thread_in_native"); 4758 jlong cur, end; 4759 int mode; 4760 struct stat64 buf64; 4761 4762 if (::fstat64(fd, &buf64) >= 0) { 4763 mode = buf64.st_mode; 4764 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 4765 int n,ioctl_return; 4766 4767 RESTARTABLE(::ioctl(fd, FIONREAD, &n), ioctl_return); 4768 if (ioctl_return>= 0) { 4769 *bytes = n; 4770 return 1; 4771 } 4772 } 4773 } 4774 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) { 4775 return 0; 4776 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) { 4777 return 0; 4778 } else if (::lseek64(fd, cur, SEEK_SET) == -1) { 4779 return 0; 4780 } 4781 *bytes = end - cur; 4782 return 1; 4783 } 4784 4785 // Map a block of memory. 4786 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 4787 char *addr, size_t bytes, bool read_only, 4788 bool allow_exec) { 4789 int prot; 4790 int flags; 4791 4792 if (read_only) { 4793 prot = PROT_READ; 4794 flags = MAP_SHARED; 4795 } else { 4796 prot = PROT_READ | PROT_WRITE; 4797 flags = MAP_PRIVATE; 4798 } 4799 4800 if (allow_exec) { 4801 prot |= PROT_EXEC; 4802 } 4803 4804 if (addr != NULL) { 4805 flags |= MAP_FIXED; 4806 } 4807 4808 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, 4809 fd, file_offset); 4810 if (mapped_address == MAP_FAILED) { 4811 return NULL; 4812 } 4813 return mapped_address; 4814 } 4815 4816 4817 // Remap a block of memory. 4818 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 4819 char *addr, size_t bytes, bool read_only, 4820 bool allow_exec) { 4821 // same as map_memory() on this OS 4822 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 4823 allow_exec); 4824 } 4825 4826 4827 // Unmap a block of memory. 4828 bool os::pd_unmap_memory(char* addr, size_t bytes) { 4829 return munmap(addr, bytes) == 0; 4830 } 4831 4832 void os::pause() { 4833 char filename[MAX_PATH]; 4834 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 4835 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 4836 } else { 4837 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 4838 } 4839 4840 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 4841 if (fd != -1) { 4842 struct stat buf; 4843 ::close(fd); 4844 while (::stat(filename, &buf) == 0) { 4845 (void)::poll(NULL, 0, 100); 4846 } 4847 } else { 4848 jio_fprintf(stderr, 4849 "Could not open pause file '%s', continuing immediately.\n", filename); 4850 } 4851 } 4852 4853 #ifndef PRODUCT 4854 #ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS 4855 // Turn this on if you need to trace synch operations. 4856 // Set RECORD_SYNCH_LIMIT to a large-enough value, 4857 // and call record_synch_enable and record_synch_disable 4858 // around the computation of interest. 4859 4860 void record_synch(char* name, bool returning); // defined below 4861 4862 class RecordSynch { 4863 char* _name; 4864 public: 4865 RecordSynch(char* name) :_name(name) { record_synch(_name, false); } 4866 ~RecordSynch() { record_synch(_name, true); } 4867 }; 4868 4869 #define CHECK_SYNCH_OP(ret, name, params, args, inner) \ 4870 extern "C" ret name params { \ 4871 typedef ret name##_t params; \ 4872 static name##_t* implem = NULL; \ 4873 static int callcount = 0; \ 4874 if (implem == NULL) { \ 4875 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \ 4876 if (implem == NULL) fatal(dlerror()); \ 4877 } \ 4878 ++callcount; \ 4879 RecordSynch _rs(#name); \ 4880 inner; \ 4881 return implem args; \ 4882 } 4883 // in dbx, examine callcounts this way: 4884 // for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done 4885 4886 #define CHECK_POINTER_OK(p) \ 4887 (!Universe::is_fully_initialized() || !Universe::is_reserved_heap((oop)(p))) 4888 #define CHECK_MU \ 4889 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only."); 4890 #define CHECK_CV \ 4891 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only."); 4892 #define CHECK_P(p) \ 4893 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only."); 4894 4895 #define CHECK_MUTEX(mutex_op) \ 4896 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU); 4897 4898 CHECK_MUTEX( mutex_lock) 4899 CHECK_MUTEX( _mutex_lock) 4900 CHECK_MUTEX( mutex_unlock) 4901 CHECK_MUTEX(_mutex_unlock) 4902 CHECK_MUTEX( mutex_trylock) 4903 CHECK_MUTEX(_mutex_trylock) 4904 4905 #define CHECK_COND(cond_op) \ 4906 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU; CHECK_CV); 4907 4908 CHECK_COND( cond_wait); 4909 CHECK_COND(_cond_wait); 4910 CHECK_COND(_cond_wait_cancel); 4911 4912 #define CHECK_COND2(cond_op) \ 4913 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU; CHECK_CV); 4914 4915 CHECK_COND2( cond_timedwait); 4916 CHECK_COND2(_cond_timedwait); 4917 CHECK_COND2(_cond_timedwait_cancel); 4918 4919 // do the _lwp_* versions too 4920 #define mutex_t lwp_mutex_t 4921 #define cond_t lwp_cond_t 4922 CHECK_MUTEX( _lwp_mutex_lock) 4923 CHECK_MUTEX( _lwp_mutex_unlock) 4924 CHECK_MUTEX( _lwp_mutex_trylock) 4925 CHECK_MUTEX( __lwp_mutex_lock) 4926 CHECK_MUTEX( __lwp_mutex_unlock) 4927 CHECK_MUTEX( __lwp_mutex_trylock) 4928 CHECK_MUTEX(___lwp_mutex_lock) 4929 CHECK_MUTEX(___lwp_mutex_unlock) 4930 4931 CHECK_COND( _lwp_cond_wait); 4932 CHECK_COND( __lwp_cond_wait); 4933 CHECK_COND(___lwp_cond_wait); 4934 4935 CHECK_COND2( _lwp_cond_timedwait); 4936 CHECK_COND2( __lwp_cond_timedwait); 4937 #undef mutex_t 4938 #undef cond_t 4939 4940 CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0); 4941 CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0); 4942 CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0); 4943 CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0); 4944 CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p)); 4945 CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p)); 4946 CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV); 4947 CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV); 4948 4949 4950 // recording machinery: 4951 4952 enum { RECORD_SYNCH_LIMIT = 200 }; 4953 char* record_synch_name[RECORD_SYNCH_LIMIT]; 4954 void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT]; 4955 bool record_synch_returning[RECORD_SYNCH_LIMIT]; 4956 thread_t record_synch_thread[RECORD_SYNCH_LIMIT]; 4957 int record_synch_count = 0; 4958 bool record_synch_enabled = false; 4959 4960 // in dbx, examine recorded data this way: 4961 // for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done 4962 4963 void record_synch(char* name, bool returning) { 4964 if (record_synch_enabled) { 4965 if (record_synch_count < RECORD_SYNCH_LIMIT) { 4966 record_synch_name[record_synch_count] = name; 4967 record_synch_returning[record_synch_count] = returning; 4968 record_synch_thread[record_synch_count] = thr_self(); 4969 record_synch_arg0ptr[record_synch_count] = &name; 4970 record_synch_count++; 4971 } 4972 // put more checking code here: 4973 // ... 4974 } 4975 } 4976 4977 void record_synch_enable() { 4978 // start collecting trace data, if not already doing so 4979 if (!record_synch_enabled) record_synch_count = 0; 4980 record_synch_enabled = true; 4981 } 4982 4983 void record_synch_disable() { 4984 // stop collecting trace data 4985 record_synch_enabled = false; 4986 } 4987 4988 #endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS 4989 #endif // PRODUCT 4990 4991 const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime); 4992 const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) - 4993 (intptr_t)(&((prusage_t *)(NULL))->pr_utime); 4994 4995 4996 // JVMTI & JVM monitoring and management support 4997 // The thread_cpu_time() and current_thread_cpu_time() are only 4998 // supported if is_thread_cpu_time_supported() returns true. 4999 // They are not supported on Solaris T1. 5000 5001 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 5002 // are used by JVM M&M and JVMTI to get user+sys or user CPU time 5003 // of a thread. 5004 // 5005 // current_thread_cpu_time() and thread_cpu_time(Thread *) 5006 // returns the fast estimate available on the platform. 5007 5008 // hrtime_t gethrvtime() return value includes 5009 // user time but does not include system time 5010 jlong os::current_thread_cpu_time() { 5011 return (jlong) gethrvtime(); 5012 } 5013 5014 jlong os::thread_cpu_time(Thread *thread) { 5015 // return user level CPU time only to be consistent with 5016 // what current_thread_cpu_time returns. 5017 // thread_cpu_time_info() must be changed if this changes 5018 return os::thread_cpu_time(thread, false /* user time only */); 5019 } 5020 5021 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 5022 if (user_sys_cpu_time) { 5023 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 5024 } else { 5025 return os::current_thread_cpu_time(); 5026 } 5027 } 5028 5029 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 5030 char proc_name[64]; 5031 int count; 5032 prusage_t prusage; 5033 jlong lwp_time; 5034 int fd; 5035 5036 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage", 5037 getpid(), 5038 thread->osthread()->lwp_id()); 5039 fd = ::open(proc_name, O_RDONLY); 5040 if (fd == -1) return -1; 5041 5042 do { 5043 count = ::pread(fd, 5044 (void *)&prusage.pr_utime, 5045 thr_time_size, 5046 thr_time_off); 5047 } while (count < 0 && errno == EINTR); 5048 ::close(fd); 5049 if (count < 0) return -1; 5050 5051 if (user_sys_cpu_time) { 5052 // user + system CPU time 5053 lwp_time = (((jlong)prusage.pr_stime.tv_sec + 5054 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) + 5055 (jlong)prusage.pr_stime.tv_nsec + 5056 (jlong)prusage.pr_utime.tv_nsec; 5057 } else { 5058 // user level CPU time only 5059 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) + 5060 (jlong)prusage.pr_utime.tv_nsec; 5061 } 5062 5063 return (lwp_time); 5064 } 5065 5066 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 5067 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 5068 info_ptr->may_skip_backward = false; // elapsed time not wall time 5069 info_ptr->may_skip_forward = false; // elapsed time not wall time 5070 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned 5071 } 5072 5073 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 5074 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 5075 info_ptr->may_skip_backward = false; // elapsed time not wall time 5076 info_ptr->may_skip_forward = false; // elapsed time not wall time 5077 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned 5078 } 5079 5080 bool os::is_thread_cpu_time_supported() { 5081 return true; 5082 } 5083 5084 // System loadavg support. Returns -1 if load average cannot be obtained. 5085 // Return the load average for our processor set if the primitive exists 5086 // (Solaris 9 and later). Otherwise just return system wide loadavg. 5087 int os::loadavg(double loadavg[], int nelem) { 5088 if (pset_getloadavg_ptr != NULL) { 5089 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem); 5090 } else { 5091 return ::getloadavg(loadavg, nelem); 5092 } 5093 } 5094 5095 //--------------------------------------------------------------------------------- 5096 5097 bool os::find(address addr, outputStream* st) { 5098 Dl_info dlinfo; 5099 memset(&dlinfo, 0, sizeof(dlinfo)); 5100 if (dladdr(addr, &dlinfo) != 0) { 5101 st->print(PTR_FORMAT ": ", addr); 5102 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) { 5103 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr); 5104 } else if (dlinfo.dli_fbase != NULL) { 5105 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase); 5106 } else { 5107 st->print("<absolute address>"); 5108 } 5109 if (dlinfo.dli_fname != NULL) { 5110 st->print(" in %s", dlinfo.dli_fname); 5111 } 5112 if (dlinfo.dli_fbase != NULL) { 5113 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); 5114 } 5115 st->cr(); 5116 5117 if (Verbose) { 5118 // decode some bytes around the PC 5119 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size()); 5120 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); 5121 address lowest = (address) dlinfo.dli_sname; 5122 if (!lowest) lowest = (address) dlinfo.dli_fbase; 5123 if (begin < lowest) begin = lowest; 5124 Dl_info dlinfo2; 5125 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr 5126 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) { 5127 end = (address) dlinfo2.dli_saddr; 5128 } 5129 Disassembler::decode(begin, end, st); 5130 } 5131 return true; 5132 } 5133 return false; 5134 } 5135 5136 // Following function has been added to support HotSparc's libjvm.so running 5137 // under Solaris production JDK 1.2.2 / 1.3.0. These came from 5138 // src/solaris/hpi/native_threads in the EVM codebase. 5139 // 5140 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release 5141 // libraries and should thus be removed. We will leave it behind for a while 5142 // until we no longer want to able to run on top of 1.3.0 Solaris production 5143 // JDK. See 4341971. 5144 5145 #define STACK_SLACK 0x800 5146 5147 extern "C" { 5148 intptr_t sysThreadAvailableStackWithSlack() { 5149 stack_t st; 5150 intptr_t retval, stack_top; 5151 retval = thr_stksegment(&st); 5152 assert(retval == 0, "incorrect return value from thr_stksegment"); 5153 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned"); 5154 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned"); 5155 stack_top=(intptr_t)st.ss_sp-st.ss_size; 5156 return ((intptr_t)&stack_top - stack_top - STACK_SLACK); 5157 } 5158 } 5159 5160 // ObjectMonitor park-unpark infrastructure ... 5161 // 5162 // We implement Solaris and Linux PlatformEvents with the 5163 // obvious condvar-mutex-flag triple. 5164 // Another alternative that works quite well is pipes: 5165 // Each PlatformEvent consists of a pipe-pair. 5166 // The thread associated with the PlatformEvent 5167 // calls park(), which reads from the input end of the pipe. 5168 // Unpark() writes into the other end of the pipe. 5169 // The write-side of the pipe must be set NDELAY. 5170 // Unfortunately pipes consume a large # of handles. 5171 // Native solaris lwp_park() and lwp_unpark() work nicely, too. 5172 // Using pipes for the 1st few threads might be workable, however. 5173 // 5174 // park() is permitted to return spuriously. 5175 // Callers of park() should wrap the call to park() in 5176 // an appropriate loop. A litmus test for the correct 5177 // usage of park is the following: if park() were modified 5178 // to immediately return 0 your code should still work, 5179 // albeit degenerating to a spin loop. 5180 // 5181 // In a sense, park()-unpark() just provides more polite spinning 5182 // and polling with the key difference over naive spinning being 5183 // that a parked thread needs to be explicitly unparked() in order 5184 // to wake up and to poll the underlying condition. 5185 // 5186 // Assumption: 5187 // Only one parker can exist on an event, which is why we allocate 5188 // them per-thread. Multiple unparkers can coexist. 5189 // 5190 // _Event transitions in park() 5191 // -1 => -1 : illegal 5192 // 1 => 0 : pass - return immediately 5193 // 0 => -1 : block; then set _Event to 0 before returning 5194 // 5195 // _Event transitions in unpark() 5196 // 0 => 1 : just return 5197 // 1 => 1 : just return 5198 // -1 => either 0 or 1; must signal target thread 5199 // That is, we can safely transition _Event from -1 to either 5200 // 0 or 1. 5201 // 5202 // _Event serves as a restricted-range semaphore. 5203 // -1 : thread is blocked, i.e. there is a waiter 5204 // 0 : neutral: thread is running or ready, 5205 // could have been signaled after a wait started 5206 // 1 : signaled - thread is running or ready 5207 // 5208 // Another possible encoding of _Event would be with 5209 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits. 5210 // 5211 // TODO-FIXME: add DTRACE probes for: 5212 // 1. Tx parks 5213 // 2. Ty unparks Tx 5214 // 3. Tx resumes from park 5215 5216 5217 // value determined through experimentation 5218 #define ROUNDINGFIX 11 5219 5220 // utility to compute the abstime argument to timedwait. 5221 // TODO-FIXME: switch from compute_abstime() to unpackTime(). 5222 5223 static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) { 5224 // millis is the relative timeout time 5225 // abstime will be the absolute timeout time 5226 if (millis < 0) millis = 0; 5227 struct timeval now; 5228 int status = gettimeofday(&now, NULL); 5229 assert(status == 0, "gettimeofday"); 5230 jlong seconds = millis / 1000; 5231 jlong max_wait_period; 5232 5233 if (UseLWPSynchronization) { 5234 // forward port of fix for 4275818 (not sleeping long enough) 5235 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where 5236 // _lwp_cond_timedwait() used a round_down algorithm rather 5237 // than a round_up. For millis less than our roundfactor 5238 // it rounded down to 0 which doesn't meet the spec. 5239 // For millis > roundfactor we may return a bit sooner, but 5240 // since we can not accurately identify the patch level and 5241 // this has already been fixed in Solaris 9 and 8 we will 5242 // leave it alone rather than always rounding down. 5243 5244 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX; 5245 // It appears that when we go directly through Solaris _lwp_cond_timedwait() 5246 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6 5247 max_wait_period = 21000000; 5248 } else { 5249 max_wait_period = 50000000; 5250 } 5251 millis %= 1000; 5252 if (seconds > max_wait_period) { // see man cond_timedwait(3T) 5253 seconds = max_wait_period; 5254 } 5255 abstime->tv_sec = now.tv_sec + seconds; 5256 long usec = now.tv_usec + millis * 1000; 5257 if (usec >= 1000000) { 5258 abstime->tv_sec += 1; 5259 usec -= 1000000; 5260 } 5261 abstime->tv_nsec = usec * 1000; 5262 return abstime; 5263 } 5264 5265 void os::PlatformEvent::park() { // AKA: down() 5266 // Transitions for _Event: 5267 // -1 => -1 : illegal 5268 // 1 => 0 : pass - return immediately 5269 // 0 => -1 : block; then set _Event to 0 before returning 5270 5271 // Invariant: Only the thread associated with the Event/PlatformEvent 5272 // may call park(). 5273 assert(_nParked == 0, "invariant"); 5274 5275 int v; 5276 for (;;) { 5277 v = _Event; 5278 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 5279 } 5280 guarantee(v >= 0, "invariant"); 5281 if (v == 0) { 5282 // Do this the hard way by blocking ... 5283 // See http://monaco.sfbay/detail.jsf?cr=5094058. 5284 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking. 5285 // Only for SPARC >= V8PlusA 5286 #if defined(__sparc) && defined(COMPILER2) 5287 if (ClearFPUAtPark) { _mark_fpu_nosave(); } 5288 #endif 5289 int status = os::Solaris::mutex_lock(_mutex); 5290 assert_status(status == 0, status, "mutex_lock"); 5291 guarantee(_nParked == 0, "invariant"); 5292 ++_nParked; 5293 while (_Event < 0) { 5294 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... 5295 // Treat this the same as if the wait was interrupted 5296 // With usr/lib/lwp going to kernel, always handle ETIME 5297 status = os::Solaris::cond_wait(_cond, _mutex); 5298 if (status == ETIME) status = EINTR; 5299 assert_status(status == 0 || status == EINTR, status, "cond_wait"); 5300 } 5301 --_nParked; 5302 _Event = 0; 5303 status = os::Solaris::mutex_unlock(_mutex); 5304 assert_status(status == 0, status, "mutex_unlock"); 5305 // Paranoia to ensure our locked and lock-free paths interact 5306 // correctly with each other. 5307 OrderAccess::fence(); 5308 } 5309 } 5310 5311 int os::PlatformEvent::park(jlong millis) { 5312 // Transitions for _Event: 5313 // -1 => -1 : illegal 5314 // 1 => 0 : pass - return immediately 5315 // 0 => -1 : block; then set _Event to 0 before returning 5316 5317 guarantee(_nParked == 0, "invariant"); 5318 int v; 5319 for (;;) { 5320 v = _Event; 5321 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 5322 } 5323 guarantee(v >= 0, "invariant"); 5324 if (v != 0) return OS_OK; 5325 5326 int ret = OS_TIMEOUT; 5327 timestruc_t abst; 5328 compute_abstime(&abst, millis); 5329 5330 // See http://monaco.sfbay/detail.jsf?cr=5094058. 5331 // For Solaris SPARC set fprs.FEF=0 prior to parking. 5332 // Only for SPARC >= V8PlusA 5333 #if defined(__sparc) && defined(COMPILER2) 5334 if (ClearFPUAtPark) { _mark_fpu_nosave(); } 5335 #endif 5336 int status = os::Solaris::mutex_lock(_mutex); 5337 assert_status(status == 0, status, "mutex_lock"); 5338 guarantee(_nParked == 0, "invariant"); 5339 ++_nParked; 5340 while (_Event < 0) { 5341 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst); 5342 assert_status(status == 0 || status == EINTR || 5343 status == ETIME || status == ETIMEDOUT, 5344 status, "cond_timedwait"); 5345 if (!FilterSpuriousWakeups) break; // previous semantics 5346 if (status == ETIME || status == ETIMEDOUT) break; 5347 // We consume and ignore EINTR and spurious wakeups. 5348 } 5349 --_nParked; 5350 if (_Event >= 0) ret = OS_OK; 5351 _Event = 0; 5352 status = os::Solaris::mutex_unlock(_mutex); 5353 assert_status(status == 0, status, "mutex_unlock"); 5354 // Paranoia to ensure our locked and lock-free paths interact 5355 // correctly with each other. 5356 OrderAccess::fence(); 5357 return ret; 5358 } 5359 5360 void os::PlatformEvent::unpark() { 5361 // Transitions for _Event: 5362 // 0 => 1 : just return 5363 // 1 => 1 : just return 5364 // -1 => either 0 or 1; must signal target thread 5365 // That is, we can safely transition _Event from -1 to either 5366 // 0 or 1. 5367 // See also: "Semaphores in Plan 9" by Mullender & Cox 5368 // 5369 // Note: Forcing a transition from "-1" to "1" on an unpark() means 5370 // that it will take two back-to-back park() calls for the owning 5371 // thread to block. This has the benefit of forcing a spurious return 5372 // from the first park() call after an unpark() call which will help 5373 // shake out uses of park() and unpark() without condition variables. 5374 5375 if (Atomic::xchg(1, &_Event) >= 0) return; 5376 5377 // If the thread associated with the event was parked, wake it. 5378 // Wait for the thread assoc with the PlatformEvent to vacate. 5379 int status = os::Solaris::mutex_lock(_mutex); 5380 assert_status(status == 0, status, "mutex_lock"); 5381 int AnyWaiters = _nParked; 5382 status = os::Solaris::mutex_unlock(_mutex); 5383 assert_status(status == 0, status, "mutex_unlock"); 5384 guarantee(AnyWaiters == 0 || AnyWaiters == 1, "invariant"); 5385 if (AnyWaiters != 0) { 5386 // Note that we signal() *after* dropping the lock for "immortal" Events. 5387 // This is safe and avoids a common class of futile wakeups. In rare 5388 // circumstances this can cause a thread to return prematurely from 5389 // cond_{timed}wait() but the spurious wakeup is benign and the victim 5390 // will simply re-test the condition and re-park itself. 5391 // This provides particular benefit if the underlying platform does not 5392 // provide wait morphing. 5393 status = os::Solaris::cond_signal(_cond); 5394 assert_status(status == 0, status, "cond_signal"); 5395 } 5396 } 5397 5398 // JSR166 5399 // ------------------------------------------------------- 5400 5401 // The solaris and linux implementations of park/unpark are fairly 5402 // conservative for now, but can be improved. They currently use a 5403 // mutex/condvar pair, plus _counter. 5404 // Park decrements _counter if > 0, else does a condvar wait. Unpark 5405 // sets count to 1 and signals condvar. Only one thread ever waits 5406 // on the condvar. Contention seen when trying to park implies that someone 5407 // is unparking you, so don't wait. And spurious returns are fine, so there 5408 // is no need to track notifications. 5409 5410 #define MAX_SECS 100000000 5411 5412 // This code is common to linux and solaris and will be moved to a 5413 // common place in dolphin. 5414 // 5415 // The passed in time value is either a relative time in nanoseconds 5416 // or an absolute time in milliseconds. Either way it has to be unpacked 5417 // into suitable seconds and nanoseconds components and stored in the 5418 // given timespec structure. 5419 // Given time is a 64-bit value and the time_t used in the timespec is only 5420 // a signed-32-bit value (except on 64-bit Linux) we have to watch for 5421 // overflow if times way in the future are given. Further on Solaris versions 5422 // prior to 10 there is a restriction (see cond_timedwait) that the specified 5423 // number of seconds, in abstime, is less than current_time + 100,000,000. 5424 // As it will be 28 years before "now + 100000000" will overflow we can 5425 // ignore overflow and just impose a hard-limit on seconds using the value 5426 // of "now + 100,000,000". This places a limit on the timeout of about 3.17 5427 // years from "now". 5428 // 5429 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) { 5430 assert(time > 0, "convertTime"); 5431 5432 struct timeval now; 5433 int status = gettimeofday(&now, NULL); 5434 assert(status == 0, "gettimeofday"); 5435 5436 time_t max_secs = now.tv_sec + MAX_SECS; 5437 5438 if (isAbsolute) { 5439 jlong secs = time / 1000; 5440 if (secs > max_secs) { 5441 absTime->tv_sec = max_secs; 5442 } else { 5443 absTime->tv_sec = secs; 5444 } 5445 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; 5446 } else { 5447 jlong secs = time / NANOSECS_PER_SEC; 5448 if (secs >= MAX_SECS) { 5449 absTime->tv_sec = max_secs; 5450 absTime->tv_nsec = 0; 5451 } else { 5452 absTime->tv_sec = now.tv_sec + secs; 5453 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; 5454 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { 5455 absTime->tv_nsec -= NANOSECS_PER_SEC; 5456 ++absTime->tv_sec; // note: this must be <= max_secs 5457 } 5458 } 5459 } 5460 assert(absTime->tv_sec >= 0, "tv_sec < 0"); 5461 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); 5462 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); 5463 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); 5464 } 5465 5466 void Parker::park(bool isAbsolute, jlong time) { 5467 // Ideally we'd do something useful while spinning, such 5468 // as calling unpackTime(). 5469 5470 // Optional fast-path check: 5471 // Return immediately if a permit is available. 5472 // We depend on Atomic::xchg() having full barrier semantics 5473 // since we are doing a lock-free update to _counter. 5474 if (Atomic::xchg(0, &_counter) > 0) return; 5475 5476 // Optional fast-exit: Check interrupt before trying to wait 5477 Thread* thread = Thread::current(); 5478 assert(thread->is_Java_thread(), "Must be JavaThread"); 5479 JavaThread *jt = (JavaThread *)thread; 5480 if (Thread::is_interrupted(thread, false)) { 5481 return; 5482 } 5483 5484 // First, demultiplex/decode time arguments 5485 timespec absTime; 5486 if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all 5487 return; 5488 } 5489 if (time > 0) { 5490 // Warning: this code might be exposed to the old Solaris time 5491 // round-down bugs. Grep "roundingFix" for details. 5492 unpackTime(&absTime, isAbsolute, time); 5493 } 5494 5495 // Enter safepoint region 5496 // Beware of deadlocks such as 6317397. 5497 // The per-thread Parker:: _mutex is a classic leaf-lock. 5498 // In particular a thread must never block on the Threads_lock while 5499 // holding the Parker:: mutex. If safepoints are pending both the 5500 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. 5501 ThreadBlockInVM tbivm(jt); 5502 5503 // Don't wait if cannot get lock since interference arises from 5504 // unblocking. Also. check interrupt before trying wait 5505 if (Thread::is_interrupted(thread, false) || 5506 os::Solaris::mutex_trylock(_mutex) != 0) { 5507 return; 5508 } 5509 5510 int status; 5511 5512 if (_counter > 0) { // no wait needed 5513 _counter = 0; 5514 status = os::Solaris::mutex_unlock(_mutex); 5515 assert(status == 0, "invariant"); 5516 // Paranoia to ensure our locked and lock-free paths interact 5517 // correctly with each other and Java-level accesses. 5518 OrderAccess::fence(); 5519 return; 5520 } 5521 5522 #ifdef ASSERT 5523 // Don't catch signals while blocked; let the running threads have the signals. 5524 // (This allows a debugger to break into the running thread.) 5525 sigset_t oldsigs; 5526 sigset_t* allowdebug_blocked = os::Solaris::allowdebug_blocked_signals(); 5527 pthread_sigmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); 5528 #endif 5529 5530 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 5531 jt->set_suspend_equivalent(); 5532 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 5533 5534 // Do this the hard way by blocking ... 5535 // See http://monaco.sfbay/detail.jsf?cr=5094058. 5536 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking. 5537 // Only for SPARC >= V8PlusA 5538 #if defined(__sparc) && defined(COMPILER2) 5539 if (ClearFPUAtPark) { _mark_fpu_nosave(); } 5540 #endif 5541 5542 if (time == 0) { 5543 status = os::Solaris::cond_wait(_cond, _mutex); 5544 } else { 5545 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime); 5546 } 5547 // Note that an untimed cond_wait() can sometimes return ETIME on older 5548 // versions of the Solaris. 5549 assert_status(status == 0 || status == EINTR || 5550 status == ETIME || status == ETIMEDOUT, 5551 status, "cond_timedwait"); 5552 5553 #ifdef ASSERT 5554 pthread_sigmask(SIG_SETMASK, &oldsigs, NULL); 5555 #endif 5556 _counter = 0; 5557 status = os::Solaris::mutex_unlock(_mutex); 5558 assert_status(status == 0, status, "mutex_unlock"); 5559 // Paranoia to ensure our locked and lock-free paths interact 5560 // correctly with each other and Java-level accesses. 5561 OrderAccess::fence(); 5562 5563 // If externally suspended while waiting, re-suspend 5564 if (jt->handle_special_suspend_equivalent_condition()) { 5565 jt->java_suspend_self(); 5566 } 5567 } 5568 5569 void Parker::unpark() { 5570 int status = os::Solaris::mutex_lock(_mutex); 5571 assert(status == 0, "invariant"); 5572 const int s = _counter; 5573 _counter = 1; 5574 status = os::Solaris::mutex_unlock(_mutex); 5575 assert(status == 0, "invariant"); 5576 5577 if (s < 1) { 5578 status = os::Solaris::cond_signal(_cond); 5579 assert(status == 0, "invariant"); 5580 } 5581 } 5582 5583 extern char** environ; 5584 5585 // Run the specified command in a separate process. Return its exit value, 5586 // or -1 on failure (e.g. can't fork a new process). 5587 // Unlike system(), this function can be called from signal handler. It 5588 // doesn't block SIGINT et al. 5589 int os::fork_and_exec(char* cmd) { 5590 char * argv[4]; 5591 argv[0] = (char *)"sh"; 5592 argv[1] = (char *)"-c"; 5593 argv[2] = cmd; 5594 argv[3] = NULL; 5595 5596 // fork is async-safe, fork1 is not so can't use in signal handler 5597 pid_t pid; 5598 Thread* t = Thread::current_or_null_safe(); 5599 if (t != NULL && t->is_inside_signal_handler()) { 5600 pid = fork(); 5601 } else { 5602 pid = fork1(); 5603 } 5604 5605 if (pid < 0) { 5606 // fork failed 5607 warning("fork failed: %s", os::strerror(errno)); 5608 return -1; 5609 5610 } else if (pid == 0) { 5611 // child process 5612 5613 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris 5614 execve("/usr/bin/sh", argv, environ); 5615 5616 // execve failed 5617 _exit(-1); 5618 5619 } else { 5620 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 5621 // care about the actual exit code, for now. 5622 5623 int status; 5624 5625 // Wait for the child process to exit. This returns immediately if 5626 // the child has already exited. */ 5627 while (waitpid(pid, &status, 0) < 0) { 5628 switch (errno) { 5629 case ECHILD: return 0; 5630 case EINTR: break; 5631 default: return -1; 5632 } 5633 } 5634 5635 if (WIFEXITED(status)) { 5636 // The child exited normally; get its exit code. 5637 return WEXITSTATUS(status); 5638 } else if (WIFSIGNALED(status)) { 5639 // The child exited because of a signal 5640 // The best value to return is 0x80 + signal number, 5641 // because that is what all Unix shells do, and because 5642 // it allows callers to distinguish between process exit and 5643 // process death by signal. 5644 return 0x80 + WTERMSIG(status); 5645 } else { 5646 // Unknown exit code; pass it through 5647 return status; 5648 } 5649 } 5650 } 5651 5652 // is_headless_jre() 5653 // 5654 // Test for the existence of xawt/libmawt.so or libawt_xawt.so 5655 // in order to report if we are running in a headless jre 5656 // 5657 // Since JDK8 xawt/libmawt.so was moved into the same directory 5658 // as libawt.so, and renamed libawt_xawt.so 5659 // 5660 bool os::is_headless_jre() { 5661 struct stat statbuf; 5662 char buf[MAXPATHLEN]; 5663 char libmawtpath[MAXPATHLEN]; 5664 const char *xawtstr = "/xawt/libmawt.so"; 5665 const char *new_xawtstr = "/libawt_xawt.so"; 5666 char *p; 5667 5668 // Get path to libjvm.so 5669 os::jvm_path(buf, sizeof(buf)); 5670 5671 // Get rid of libjvm.so 5672 p = strrchr(buf, '/'); 5673 if (p == NULL) { 5674 return false; 5675 } else { 5676 *p = '\0'; 5677 } 5678 5679 // Get rid of client or server 5680 p = strrchr(buf, '/'); 5681 if (p == NULL) { 5682 return false; 5683 } else { 5684 *p = '\0'; 5685 } 5686 5687 // check xawt/libmawt.so 5688 strcpy(libmawtpath, buf); 5689 strcat(libmawtpath, xawtstr); 5690 if (::stat(libmawtpath, &statbuf) == 0) return false; 5691 5692 // check libawt_xawt.so 5693 strcpy(libmawtpath, buf); 5694 strcat(libmawtpath, new_xawtstr); 5695 if (::stat(libmawtpath, &statbuf) == 0) return false; 5696 5697 return true; 5698 } 5699 5700 size_t os::write(int fd, const void *buf, unsigned int nBytes) { 5701 size_t res; 5702 RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res); 5703 return res; 5704 } 5705 5706 int os::close(int fd) { 5707 return ::close(fd); 5708 } 5709 5710 int os::socket_close(int fd) { 5711 return ::close(fd); 5712 } 5713 5714 int os::recv(int fd, char* buf, size_t nBytes, uint flags) { 5715 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 5716 "Assumed _thread_in_native"); 5717 RESTARTABLE_RETURN_INT((int)::recv(fd, buf, nBytes, flags)); 5718 } 5719 5720 int os::send(int fd, char* buf, size_t nBytes, uint flags) { 5721 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 5722 "Assumed _thread_in_native"); 5723 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags)); 5724 } 5725 5726 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) { 5727 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags)); 5728 } 5729 5730 // As both poll and select can be interrupted by signals, we have to be 5731 // prepared to restart the system call after updating the timeout, unless 5732 // a poll() is done with timeout == -1, in which case we repeat with this 5733 // "wait forever" value. 5734 5735 int os::connect(int fd, struct sockaddr *him, socklen_t len) { 5736 int _result; 5737 _result = ::connect(fd, him, len); 5738 5739 // On Solaris, when a connect() call is interrupted, the connection 5740 // can be established asynchronously (see 6343810). Subsequent calls 5741 // to connect() must check the errno value which has the semantic 5742 // described below (copied from the connect() man page). Handling 5743 // of asynchronously established connections is required for both 5744 // blocking and non-blocking sockets. 5745 // EINTR The connection attempt was interrupted 5746 // before any data arrived by the delivery of 5747 // a signal. The connection, however, will be 5748 // established asynchronously. 5749 // 5750 // EINPROGRESS The socket is non-blocking, and the connec- 5751 // tion cannot be completed immediately. 5752 // 5753 // EALREADY The socket is non-blocking, and a previous 5754 // connection attempt has not yet been com- 5755 // pleted. 5756 // 5757 // EISCONN The socket is already connected. 5758 if (_result == OS_ERR && errno == EINTR) { 5759 // restarting a connect() changes its errno semantics 5760 RESTARTABLE(::connect(fd, him, len), _result); 5761 // undo these changes 5762 if (_result == OS_ERR) { 5763 if (errno == EALREADY) { 5764 errno = EINPROGRESS; // fall through 5765 } else if (errno == EISCONN) { 5766 errno = 0; 5767 return OS_OK; 5768 } 5769 } 5770 } 5771 return _result; 5772 } 5773 5774 // Get the default path to the core file 5775 // Returns the length of the string 5776 int os::get_core_path(char* buffer, size_t bufferSize) { 5777 const char* p = get_current_directory(buffer, bufferSize); 5778 5779 if (p == NULL) { 5780 assert(p != NULL, "failed to get current directory"); 5781 return 0; 5782 } 5783 5784 jio_snprintf(buffer, bufferSize, "%s/core or core.%d", 5785 p, current_process_id()); 5786 5787 return strlen(buffer); 5788 } 5789 5790 #ifndef PRODUCT 5791 void TestReserveMemorySpecial_test() { 5792 // No tests available for this platform 5793 } 5794 #endif 5795 5796 bool os::start_debugging(char *buf, int buflen) { 5797 int len = (int)strlen(buf); 5798 char *p = &buf[len]; 5799 5800 jio_snprintf(p, buflen-len, 5801 "\n\n" 5802 "Do you want to debug the problem?\n\n" 5803 "To debug, run 'dbx - %d'; then switch to thread " INTX_FORMAT "\n" 5804 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n" 5805 "Otherwise, press RETURN to abort...", 5806 os::current_process_id(), os::current_thread_id()); 5807 5808 bool yes = os::message_box("Unexpected Error", buf); 5809 5810 if (yes) { 5811 // yes, user asked VM to launch debugger 5812 jio_snprintf(buf, sizeof(buf), "dbx - %d", os::current_process_id()); 5813 5814 os::fork_and_exec(buf); 5815 yes = false; 5816 } 5817 return yes; 5818 }