1 /* 2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 // no precompiled headers 26 #include "jvm.h" 27 #include "classfile/classLoader.hpp" 28 #include "classfile/systemDictionary.hpp" 29 #include "classfile/vmSymbols.hpp" 30 #include "code/icBuffer.hpp" 31 #include "code/vtableStubs.hpp" 32 #include "compiler/compileBroker.hpp" 33 #include "compiler/disassembler.hpp" 34 #include "interpreter/interpreter.hpp" 35 #include "logging/log.hpp" 36 #include "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_misc.hpp" 43 #include "runtime/arguments.hpp" 44 #include "runtime/atomic.hpp" 45 #include "runtime/extendedPC.hpp" 46 #include "runtime/globals.hpp" 47 #include "runtime/interfaceSupport.inline.hpp" 48 #include "runtime/java.hpp" 49 #include "runtime/javaCalls.hpp" 50 #include "runtime/mutexLocker.hpp" 51 #include "runtime/objectMonitor.hpp" 52 #include "runtime/orderAccess.hpp" 53 #include "runtime/osThread.hpp" 54 #include "runtime/perfMemory.hpp" 55 #include "runtime/sharedRuntime.hpp" 56 #include "runtime/statSampler.hpp" 57 #include "runtime/stubRoutines.hpp" 58 #include "runtime/thread.inline.hpp" 59 #include "runtime/threadCritical.hpp" 60 #include "runtime/timer.hpp" 61 #include "runtime/vm_version.hpp" 62 #include "semaphore_posix.hpp" 63 #include "services/attachListener.hpp" 64 #include "services/memTracker.hpp" 65 #include "services/runtimeService.hpp" 66 #include "utilities/align.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 <setjmp.h> 82 # include <signal.h> 83 # include <stdio.h> 84 # include <alloca.h> 85 # include <sys/filio.h> 86 # include <sys/ipc.h> 87 # include <sys/lwp.h> 88 # include <sys/machelf.h> // for elf Sym structure used by dladdr1 89 # include <sys/mman.h> 90 # include <sys/processor.h> 91 # include <sys/procset.h> 92 # include <sys/pset.h> 93 # include <sys/resource.h> 94 # include <sys/shm.h> 95 # include <sys/socket.h> 96 # include <sys/stat.h> 97 # include <sys/systeminfo.h> 98 # include <sys/time.h> 99 # include <sys/times.h> 100 # include <sys/types.h> 101 # include <sys/wait.h> 102 # include <sys/utsname.h> 103 # include <thread.h> 104 # include <unistd.h> 105 # include <sys/priocntl.h> 106 # include <sys/rtpriocntl.h> 107 # include <sys/tspriocntl.h> 108 # include <sys/iapriocntl.h> 109 # include <sys/fxpriocntl.h> 110 # include <sys/loadavg.h> 111 # include <string.h> 112 # include <stdio.h> 113 114 # define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later 115 # include <sys/procfs.h> // see comment in <sys/procfs.h> 116 117 #define MAX_PATH (2 * K) 118 119 // for timer info max values which include all bits 120 #define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) 121 122 123 // Here are some liblgrp types from sys/lgrp_user.h to be able to 124 // compile on older systems without this header file. 125 126 #ifndef MADV_ACCESS_LWP 127 #define MADV_ACCESS_LWP 7 /* next LWP to access heavily */ 128 #endif 129 #ifndef MADV_ACCESS_MANY 130 #define MADV_ACCESS_MANY 8 /* many processes to access heavily */ 131 #endif 132 133 #ifndef LGRP_RSRC_CPU 134 #define LGRP_RSRC_CPU 0 /* CPU resources */ 135 #endif 136 #ifndef LGRP_RSRC_MEM 137 #define LGRP_RSRC_MEM 1 /* memory resources */ 138 #endif 139 140 // Values for ThreadPriorityPolicy == 1 141 int prio_policy1[CriticalPriority+1] = { 142 -99999, 0, 16, 32, 48, 64, 143 80, 96, 112, 124, 127, 127 }; 144 145 // System parameters used internally 146 static clock_t clock_tics_per_sec = 100; 147 148 // Track if we have called enable_extended_FILE_stdio (on Solaris 10u4+) 149 static bool enabled_extended_FILE_stdio = false; 150 151 // For diagnostics to print a message once. see run_periodic_checks 152 static bool check_addr0_done = false; 153 static sigset_t check_signal_done; 154 static bool check_signals = true; 155 156 address os::Solaris::handler_start; // start pc of thr_sighndlrinfo 157 address os::Solaris::handler_end; // end pc of thr_sighndlrinfo 158 159 address os::Solaris::_main_stack_base = NULL; // 4352906 workaround 160 161 os::Solaris::pthread_setname_np_func_t os::Solaris::_pthread_setname_np = NULL; 162 163 // "default" initializers for missing libc APIs 164 extern "C" { 165 static int lwp_mutex_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; } 166 static int lwp_mutex_destroy(mutex_t *mx) { return 0; } 167 168 static int lwp_cond_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; } 169 static int lwp_cond_destroy(cond_t *cv) { return 0; } 170 } 171 172 // "default" initializers for pthread-based synchronization 173 extern "C" { 174 static int pthread_mutex_default_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; } 175 static int pthread_cond_default_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; } 176 } 177 178 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time); 179 180 static inline size_t adjust_stack_size(address base, size_t size) { 181 if ((ssize_t)size < 0) { 182 // 4759953: Compensate for ridiculous stack size. 183 size = max_intx; 184 } 185 if (size > (size_t)base) { 186 // 4812466: Make sure size doesn't allow the stack to wrap the address space. 187 size = (size_t)base; 188 } 189 return size; 190 } 191 192 static inline stack_t get_stack_info() { 193 stack_t st; 194 int retval = thr_stksegment(&st); 195 st.ss_size = adjust_stack_size((address)st.ss_sp, st.ss_size); 196 assert(retval == 0, "incorrect return value from thr_stksegment"); 197 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned"); 198 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned"); 199 return st; 200 } 201 202 static void _handle_uncaught_cxx_exception() { 203 VMError::report_and_die("An uncaught C++ exception"); 204 } 205 206 bool os::is_primordial_thread(void) { 207 int r = thr_main(); 208 guarantee(r == 0 || r == 1, "CR6501650 or CR6493689"); 209 return r == 1; 210 } 211 212 address os::current_stack_base() { 213 bool _is_primordial_thread = is_primordial_thread(); 214 215 // Workaround 4352906, avoid calls to thr_stksegment by 216 // thr_main after the first one (it looks like we trash 217 // some data, causing the value for ss_sp to be incorrect). 218 if (!_is_primordial_thread || os::Solaris::_main_stack_base == NULL) { 219 stack_t st = get_stack_info(); 220 if (_is_primordial_thread) { 221 // cache initial value of stack base 222 os::Solaris::_main_stack_base = (address)st.ss_sp; 223 } 224 return (address)st.ss_sp; 225 } else { 226 guarantee(os::Solaris::_main_stack_base != NULL, "Attempt to use null cached stack base"); 227 return os::Solaris::_main_stack_base; 228 } 229 } 230 231 size_t os::current_stack_size() { 232 size_t size; 233 234 if (!is_primordial_thread()) { 235 size = get_stack_info().ss_size; 236 } else { 237 struct rlimit limits; 238 getrlimit(RLIMIT_STACK, &limits); 239 size = adjust_stack_size(os::Solaris::_main_stack_base, (size_t)limits.rlim_cur); 240 } 241 // base may not be page aligned 242 address base = current_stack_base(); 243 address bottom = align_up(base - size, os::vm_page_size());; 244 return (size_t)(base - bottom); 245 } 246 247 struct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 248 return localtime_r(clock, res); 249 } 250 251 void os::Solaris::try_enable_extended_io() { 252 typedef int (*enable_extended_FILE_stdio_t)(int, int); 253 254 if (!UseExtendedFileIO) { 255 return; 256 } 257 258 enable_extended_FILE_stdio_t enabler = 259 (enable_extended_FILE_stdio_t) dlsym(RTLD_DEFAULT, 260 "enable_extended_FILE_stdio"); 261 if (enabler) { 262 enabler(-1, -1); 263 } 264 } 265 266 static int _processors_online = 0; 267 268 jint os::Solaris::_os_thread_limit = 0; 269 volatile jint os::Solaris::_os_thread_count = 0; 270 271 julong os::available_memory() { 272 return Solaris::available_memory(); 273 } 274 275 julong os::Solaris::available_memory() { 276 return (julong)sysconf(_SC_AVPHYS_PAGES) * os::vm_page_size(); 277 } 278 279 julong os::Solaris::_physical_memory = 0; 280 281 julong os::physical_memory() { 282 return Solaris::physical_memory(); 283 } 284 285 static hrtime_t first_hrtime = 0; 286 static const hrtime_t hrtime_hz = 1000*1000*1000; 287 static volatile hrtime_t max_hrtime = 0; 288 289 290 void os::Solaris::initialize_system_info() { 291 set_processor_count(sysconf(_SC_NPROCESSORS_CONF)); 292 _processors_online = sysconf(_SC_NPROCESSORS_ONLN); 293 _physical_memory = (julong)sysconf(_SC_PHYS_PAGES) * 294 (julong)sysconf(_SC_PAGESIZE); 295 } 296 297 uint os::processor_id() { 298 const processorid_t id = ::getcpuid(); 299 assert(id >= 0 && id < _processor_count, "Invalid processor id"); 300 return (uint)id; 301 } 302 303 int os::active_processor_count() { 304 // User has overridden the number of active processors 305 if (ActiveProcessorCount > 0) { 306 log_trace(os)("active_processor_count: " 307 "active processor count set by user : %d", 308 ActiveProcessorCount); 309 return ActiveProcessorCount; 310 } 311 312 int online_cpus = sysconf(_SC_NPROCESSORS_ONLN); 313 pid_t pid = getpid(); 314 psetid_t pset = PS_NONE; 315 // Are we running in a processor set or is there any processor set around? 316 if (pset_bind(PS_QUERY, P_PID, pid, &pset) == 0) { 317 uint_t pset_cpus; 318 // Query the number of cpus available to us. 319 if (pset_info(pset, NULL, &pset_cpus, NULL) == 0) { 320 assert(pset_cpus > 0 && pset_cpus <= online_cpus, "sanity check"); 321 _processors_online = pset_cpus; 322 return pset_cpus; 323 } 324 } 325 // Otherwise return number of online cpus 326 return online_cpus; 327 } 328 329 static bool find_processors_in_pset(psetid_t pset, 330 processorid_t** id_array, 331 uint_t* id_length) { 332 bool result = false; 333 // Find the number of processors in the processor set. 334 if (pset_info(pset, NULL, id_length, NULL) == 0) { 335 // Make up an array to hold their ids. 336 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal); 337 // Fill in the array with their processor ids. 338 if (pset_info(pset, NULL, id_length, *id_array) == 0) { 339 result = true; 340 } 341 } 342 return result; 343 } 344 345 // Callers of find_processors_online() must tolerate imprecise results -- 346 // the system configuration can change asynchronously because of DR 347 // or explicit psradm operations. 348 // 349 // We also need to take care that the loop (below) terminates as the 350 // number of processors online can change between the _SC_NPROCESSORS_ONLN 351 // request and the loop that builds the list of processor ids. Unfortunately 352 // there's no reliable way to determine the maximum valid processor id, 353 // so we use a manifest constant, MAX_PROCESSOR_ID, instead. See p_online 354 // man pages, which claim the processor id set is "sparse, but 355 // not too sparse". MAX_PROCESSOR_ID is used to ensure that we eventually 356 // exit the loop. 357 // 358 // In the future we'll be able to use sysconf(_SC_CPUID_MAX), but that's 359 // not available on S8.0. 360 361 static bool find_processors_online(processorid_t** id_array, 362 uint* id_length) { 363 const processorid_t MAX_PROCESSOR_ID = 100000; 364 // Find the number of processors online. 365 *id_length = sysconf(_SC_NPROCESSORS_ONLN); 366 // Make up an array to hold their ids. 367 *id_array = NEW_C_HEAP_ARRAY(processorid_t, *id_length, mtInternal); 368 // Processors need not be numbered consecutively. 369 long found = 0; 370 processorid_t next = 0; 371 while (found < *id_length && next < MAX_PROCESSOR_ID) { 372 processor_info_t info; 373 if (processor_info(next, &info) == 0) { 374 // NB, PI_NOINTR processors are effectively online ... 375 if (info.pi_state == P_ONLINE || info.pi_state == P_NOINTR) { 376 (*id_array)[found] = next; 377 found += 1; 378 } 379 } 380 next += 1; 381 } 382 if (found < *id_length) { 383 // The loop above didn't identify the expected number of processors. 384 // We could always retry the operation, calling sysconf(_SC_NPROCESSORS_ONLN) 385 // and re-running the loop, above, but there's no guarantee of progress 386 // if the system configuration is in flux. Instead, we just return what 387 // we've got. Note that in the worst case find_processors_online() could 388 // return an empty set. (As a fall-back in the case of the empty set we 389 // could just return the ID of the current processor). 390 *id_length = found; 391 } 392 393 return true; 394 } 395 396 static bool assign_distribution(processorid_t* id_array, 397 uint id_length, 398 uint* distribution, 399 uint distribution_length) { 400 // We assume we can assign processorid_t's to uint's. 401 assert(sizeof(processorid_t) == sizeof(uint), 402 "can't convert processorid_t to uint"); 403 // Quick check to see if we won't succeed. 404 if (id_length < distribution_length) { 405 return false; 406 } 407 // Assign processor ids to the distribution. 408 // Try to shuffle processors to distribute work across boards, 409 // assuming 4 processors per board. 410 const uint processors_per_board = ProcessDistributionStride; 411 // Find the maximum processor id. 412 processorid_t max_id = 0; 413 for (uint m = 0; m < id_length; m += 1) { 414 max_id = MAX2(max_id, id_array[m]); 415 } 416 // The next id, to limit loops. 417 const processorid_t limit_id = max_id + 1; 418 // Make up markers for available processors. 419 bool* available_id = NEW_C_HEAP_ARRAY(bool, limit_id, mtInternal); 420 for (uint c = 0; c < limit_id; c += 1) { 421 available_id[c] = false; 422 } 423 for (uint a = 0; a < id_length; a += 1) { 424 available_id[id_array[a]] = true; 425 } 426 // Step by "boards", then by "slot", copying to "assigned". 427 // NEEDS_CLEANUP: The assignment of processors should be stateful, 428 // remembering which processors have been assigned by 429 // previous calls, etc., so as to distribute several 430 // independent calls of this method. What we'd like is 431 // It would be nice to have an API that let us ask 432 // how many processes are bound to a processor, 433 // but we don't have that, either. 434 // In the short term, "board" is static so that 435 // subsequent distributions don't all start at board 0. 436 static uint board = 0; 437 uint assigned = 0; 438 // Until we've found enough processors .... 439 while (assigned < distribution_length) { 440 // ... find the next available processor in the board. 441 for (uint slot = 0; slot < processors_per_board; slot += 1) { 442 uint try_id = board * processors_per_board + slot; 443 if ((try_id < limit_id) && (available_id[try_id] == true)) { 444 distribution[assigned] = try_id; 445 available_id[try_id] = false; 446 assigned += 1; 447 break; 448 } 449 } 450 board += 1; 451 if (board * processors_per_board + 0 >= limit_id) { 452 board = 0; 453 } 454 } 455 if (available_id != NULL) { 456 FREE_C_HEAP_ARRAY(bool, available_id); 457 } 458 return true; 459 } 460 461 void os::set_native_thread_name(const char *name) { 462 if (Solaris::_pthread_setname_np != NULL) { 463 // Only the first 31 bytes of 'name' are processed by pthread_setname_np 464 // but we explicitly copy into a size-limited buffer to avoid any 465 // possible overflow. 466 char buf[32]; 467 snprintf(buf, sizeof(buf), "%s", name); 468 buf[sizeof(buf) - 1] = '\0'; 469 Solaris::_pthread_setname_np(pthread_self(), buf); 470 } 471 } 472 473 bool os::distribute_processes(uint length, uint* distribution) { 474 bool result = false; 475 // Find the processor id's of all the available CPUs. 476 processorid_t* id_array = NULL; 477 uint id_length = 0; 478 // There are some races between querying information and using it, 479 // since processor sets can change dynamically. 480 psetid_t pset = PS_NONE; 481 // Are we running in a processor set? 482 if ((pset_bind(PS_QUERY, P_PID, P_MYID, &pset) == 0) && pset != PS_NONE) { 483 result = find_processors_in_pset(pset, &id_array, &id_length); 484 } else { 485 result = find_processors_online(&id_array, &id_length); 486 } 487 if (result == true) { 488 if (id_length >= length) { 489 result = assign_distribution(id_array, id_length, distribution, length); 490 } else { 491 result = false; 492 } 493 } 494 if (id_array != NULL) { 495 FREE_C_HEAP_ARRAY(processorid_t, id_array); 496 } 497 return result; 498 } 499 500 bool os::bind_to_processor(uint processor_id) { 501 // We assume that a processorid_t can be stored in a uint. 502 assert(sizeof(uint) == sizeof(processorid_t), 503 "can't convert uint to processorid_t"); 504 int bind_result = 505 processor_bind(P_LWPID, // bind LWP. 506 P_MYID, // bind current LWP. 507 (processorid_t) processor_id, // id. 508 NULL); // don't return old binding. 509 return (bind_result == 0); 510 } 511 512 // Return true if user is running as root. 513 514 bool os::have_special_privileges() { 515 static bool init = false; 516 static bool privileges = false; 517 if (!init) { 518 privileges = (getuid() != geteuid()) || (getgid() != getegid()); 519 init = true; 520 } 521 return privileges; 522 } 523 524 525 void os::init_system_properties_values() { 526 // The next steps are taken in the product version: 527 // 528 // Obtain the JAVA_HOME value from the location of libjvm.so. 529 // This library should be located at: 530 // <JAVA_HOME>/jre/lib/<arch>/{client|server}/libjvm.so. 531 // 532 // If "/jre/lib/" appears at the right place in the path, then we 533 // assume libjvm.so is installed in a JDK and we use this path. 534 // 535 // Otherwise exit with message: "Could not create the Java virtual machine." 536 // 537 // The following extra steps are taken in the debugging version: 538 // 539 // If "/jre/lib/" does NOT appear at the right place in the path 540 // instead of exit check for $JAVA_HOME environment variable. 541 // 542 // If it is defined and we are able to locate $JAVA_HOME/jre/lib/<arch>, 543 // then we append a fake suffix "hotspot/libjvm.so" to this path so 544 // it looks like libjvm.so is installed there 545 // <JAVA_HOME>/jre/lib/<arch>/hotspot/libjvm.so. 546 // 547 // Otherwise exit. 548 // 549 // Important note: if the location of libjvm.so changes this 550 // code needs to be changed accordingly. 551 552 // Base path of extensions installed on the system. 553 #define SYS_EXT_DIR "/usr/jdk/packages" 554 #define EXTENSIONS_DIR "/lib/ext" 555 556 // Buffer that fits several sprintfs. 557 // Note that the space for the colon and the trailing null are provided 558 // by the nulls included by the sizeof operator. 559 const size_t bufsize = 560 MAX3((size_t)MAXPATHLEN, // For dll_dir & friends. 561 sizeof(SYS_EXT_DIR) + sizeof("/lib/"), // invariant ld_library_path 562 (size_t)MAXPATHLEN + sizeof(EXTENSIONS_DIR) + sizeof(SYS_EXT_DIR) + sizeof(EXTENSIONS_DIR)); // extensions dir 563 char *buf = (char *)NEW_C_HEAP_ARRAY(char, bufsize, mtInternal); 564 565 // sysclasspath, java_home, dll_dir 566 { 567 char *pslash; 568 os::jvm_path(buf, bufsize); 569 570 // Found the full path to libjvm.so. 571 // Now cut the path to <java_home>/jre if we can. 572 *(strrchr(buf, '/')) = '\0'; // Get rid of /libjvm.so. 573 pslash = strrchr(buf, '/'); 574 if (pslash != NULL) { 575 *pslash = '\0'; // Get rid of /{client|server|hotspot}. 576 } 577 Arguments::set_dll_dir(buf); 578 579 if (pslash != NULL) { 580 pslash = strrchr(buf, '/'); 581 if (pslash != NULL) { 582 *pslash = '\0'; // Get rid of /lib. 583 } 584 } 585 Arguments::set_java_home(buf); 586 if (!set_boot_path('/', ':')) { 587 vm_exit_during_initialization("Failed setting boot class path.", NULL); 588 } 589 } 590 591 // Where to look for native libraries. 592 { 593 // Use dlinfo() to determine the correct java.library.path. 594 // 595 // If we're launched by the Java launcher, and the user 596 // does not set java.library.path explicitly on the commandline, 597 // the Java launcher sets LD_LIBRARY_PATH for us and unsets 598 // LD_LIBRARY_PATH_32 and LD_LIBRARY_PATH_64. In this case 599 // dlinfo returns LD_LIBRARY_PATH + crle settings (including 600 // /usr/lib), which is exactly what we want. 601 // 602 // If the user does set java.library.path, it completely 603 // overwrites this setting, and always has. 604 // 605 // If we're not launched by the Java launcher, we may 606 // get here with any/all of the LD_LIBRARY_PATH[_32|64] 607 // settings. Again, dlinfo does exactly what we want. 608 609 Dl_serinfo info_sz, *info = &info_sz; 610 Dl_serpath *path; 611 char *library_path; 612 char *common_path = buf; 613 614 // Determine search path count and required buffer size. 615 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFOSIZE, (void *)info) == -1) { 616 FREE_C_HEAP_ARRAY(char, buf); 617 vm_exit_during_initialization("dlinfo SERINFOSIZE request", dlerror()); 618 } 619 620 // Allocate new buffer and initialize. 621 info = (Dl_serinfo*)NEW_C_HEAP_ARRAY(char, info_sz.dls_size, mtInternal); 622 info->dls_size = info_sz.dls_size; 623 info->dls_cnt = info_sz.dls_cnt; 624 625 // Obtain search path information. 626 if (dlinfo(RTLD_SELF, RTLD_DI_SERINFO, (void *)info) == -1) { 627 FREE_C_HEAP_ARRAY(char, buf); 628 FREE_C_HEAP_ARRAY(char, info); 629 vm_exit_during_initialization("dlinfo SERINFO request", dlerror()); 630 } 631 632 path = &info->dls_serpath[0]; 633 634 // Note: Due to a legacy implementation, most of the library path 635 // is set in the launcher. This was to accomodate linking restrictions 636 // on legacy Solaris implementations (which are no longer supported). 637 // Eventually, all the library path setting will be done here. 638 // 639 // However, to prevent the proliferation of improperly built native 640 // libraries, the new path component /usr/jdk/packages is added here. 641 642 // Construct the invariant part of ld_library_path. 643 sprintf(common_path, SYS_EXT_DIR "/lib"); 644 645 // Struct size is more than sufficient for the path components obtained 646 // through the dlinfo() call, so only add additional space for the path 647 // components explicitly added here. 648 size_t library_path_size = info->dls_size + strlen(common_path); 649 library_path = (char *)NEW_C_HEAP_ARRAY(char, library_path_size, mtInternal); 650 library_path[0] = '\0'; 651 652 // Construct the desired Java library path from the linker's library 653 // search path. 654 // 655 // For compatibility, it is optimal that we insert the additional path 656 // components specific to the Java VM after those components specified 657 // in LD_LIBRARY_PATH (if any) but before those added by the ld.so 658 // infrastructure. 659 if (info->dls_cnt == 0) { // Not sure this can happen, but allow for it. 660 strcpy(library_path, common_path); 661 } else { 662 int inserted = 0; 663 int i; 664 for (i = 0; i < info->dls_cnt; i++, path++) { 665 uint_t flags = path->dls_flags & LA_SER_MASK; 666 if (((flags & LA_SER_LIBPATH) == 0) && !inserted) { 667 strcat(library_path, common_path); 668 strcat(library_path, os::path_separator()); 669 inserted = 1; 670 } 671 strcat(library_path, path->dls_name); 672 strcat(library_path, os::path_separator()); 673 } 674 // Eliminate trailing path separator. 675 library_path[strlen(library_path)-1] = '\0'; 676 } 677 678 // happens before argument parsing - can't use a trace flag 679 // tty->print_raw("init_system_properties_values: native lib path: "); 680 // tty->print_raw_cr(library_path); 681 682 // Callee copies into its own buffer. 683 Arguments::set_library_path(library_path); 684 685 FREE_C_HEAP_ARRAY(char, library_path); 686 FREE_C_HEAP_ARRAY(char, info); 687 } 688 689 // Extensions directories. 690 sprintf(buf, "%s" EXTENSIONS_DIR ":" SYS_EXT_DIR EXTENSIONS_DIR, Arguments::get_java_home()); 691 Arguments::set_ext_dirs(buf); 692 693 FREE_C_HEAP_ARRAY(char, buf); 694 695 #undef SYS_EXT_DIR 696 #undef EXTENSIONS_DIR 697 } 698 699 void os::breakpoint() { 700 BREAKPOINT; 701 } 702 703 bool os::Solaris::valid_stack_address(Thread* thread, address sp) { 704 address stackStart = (address)thread->stack_base(); 705 address stackEnd = (address)(stackStart - (address)thread->stack_size()); 706 if (sp < stackStart && sp >= stackEnd) return true; 707 return false; 708 } 709 710 extern "C" void breakpoint() { 711 // use debugger to set breakpoint here 712 } 713 714 static thread_t main_thread; 715 716 // Thread start routine for all newly created threads 717 extern "C" void* thread_native_entry(void* thread_addr) { 718 719 Thread* thread = (Thread*)thread_addr; 720 721 thread->record_stack_base_and_size(); 722 723 // Try to randomize the cache line index of hot stack frames. 724 // This helps when threads of the same stack traces evict each other's 725 // cache lines. The threads can be either from the same JVM instance, or 726 // from different JVM instances. The benefit is especially true for 727 // processors with hyperthreading technology. 728 static int counter = 0; 729 int pid = os::current_process_id(); 730 alloca(((pid ^ counter++) & 7) * 128); 731 732 int prio; 733 734 thread->initialize_thread_current(); 735 736 OSThread* osthr = thread->osthread(); 737 738 osthr->set_lwp_id(_lwp_self()); // Store lwp in case we are bound 739 740 log_info(os, thread)("Thread is alive (tid: " UINTX_FORMAT ").", 741 os::current_thread_id()); 742 743 if (UseNUMA) { 744 int lgrp_id = os::numa_get_group_id(); 745 if (lgrp_id != -1) { 746 thread->set_lgrp_id(lgrp_id); 747 } 748 } 749 750 // Our priority was set when we were created, and stored in the 751 // osthread, but couldn't be passed through to our LWP until now. 752 // So read back the priority and set it again. 753 754 if (osthr->thread_id() != -1) { 755 if (UseThreadPriorities) { 756 int prio = osthr->native_priority(); 757 if (ThreadPriorityVerbose) { 758 tty->print_cr("Starting Thread " INTPTR_FORMAT ", LWP is " 759 INTPTR_FORMAT ", setting priority: %d\n", 760 osthr->thread_id(), osthr->lwp_id(), prio); 761 } 762 os::set_native_priority(thread, prio); 763 } 764 } else if (ThreadPriorityVerbose) { 765 warning("Can't set priority in _start routine, thread id hasn't been set\n"); 766 } 767 768 assert(osthr->get_state() == RUNNABLE, "invalid os thread state"); 769 770 // initialize signal mask for this thread 771 os::Solaris::hotspot_sigmask(thread); 772 773 os::Solaris::init_thread_fpu_state(); 774 std::set_terminate(_handle_uncaught_cxx_exception); 775 776 thread->call_run(); 777 778 // Note: at this point the thread object may already have deleted itself. 779 // Do not dereference it from here on out. 780 781 // One less thread is executing 782 // When the VMThread gets here, the main thread may have already exited 783 // which frees the CodeHeap containing the Atomic::dec code 784 if (thread != VMThread::vm_thread() && VMThread::vm_thread() != NULL) { 785 Atomic::dec(&os::Solaris::_os_thread_count); 786 } 787 788 log_info(os, thread)("Thread finished (tid: " UINTX_FORMAT ").", os::current_thread_id()); 789 790 if (UseDetachedThreads) { 791 thr_exit(NULL); 792 ShouldNotReachHere(); 793 } 794 return NULL; 795 } 796 797 static OSThread* create_os_thread(Thread* thread, thread_t thread_id) { 798 // Allocate the OSThread object 799 OSThread* osthread = new OSThread(NULL, NULL); 800 if (osthread == NULL) return NULL; 801 802 // Store info on the Solaris thread into the OSThread 803 osthread->set_thread_id(thread_id); 804 osthread->set_lwp_id(_lwp_self()); 805 806 if (UseNUMA) { 807 int lgrp_id = os::numa_get_group_id(); 808 if (lgrp_id != -1) { 809 thread->set_lgrp_id(lgrp_id); 810 } 811 } 812 813 if (ThreadPriorityVerbose) { 814 tty->print_cr("In create_os_thread, Thread " INTPTR_FORMAT ", LWP is " INTPTR_FORMAT "\n", 815 osthread->thread_id(), osthread->lwp_id()); 816 } 817 818 // Initial thread state is INITIALIZED, not SUSPENDED 819 osthread->set_state(INITIALIZED); 820 821 return osthread; 822 } 823 824 void os::Solaris::hotspot_sigmask(Thread* thread) { 825 //Save caller's signal mask 826 sigset_t sigmask; 827 pthread_sigmask(SIG_SETMASK, NULL, &sigmask); 828 OSThread *osthread = thread->osthread(); 829 osthread->set_caller_sigmask(sigmask); 830 831 pthread_sigmask(SIG_UNBLOCK, os::Solaris::unblocked_signals(), NULL); 832 if (!ReduceSignalUsage) { 833 if (thread->is_VM_thread()) { 834 // Only the VM thread handles BREAK_SIGNAL ... 835 pthread_sigmask(SIG_UNBLOCK, vm_signals(), NULL); 836 } else { 837 // ... all other threads block BREAK_SIGNAL 838 assert(!sigismember(vm_signals(), SIGINT), "SIGINT should not be blocked"); 839 pthread_sigmask(SIG_BLOCK, vm_signals(), NULL); 840 } 841 } 842 } 843 844 bool os::create_attached_thread(JavaThread* thread) { 845 #ifdef ASSERT 846 thread->verify_not_published(); 847 #endif 848 OSThread* osthread = create_os_thread(thread, thr_self()); 849 if (osthread == NULL) { 850 return false; 851 } 852 853 // Initial thread state is RUNNABLE 854 osthread->set_state(RUNNABLE); 855 thread->set_osthread(osthread); 856 857 // initialize signal mask for this thread 858 // and save the caller's signal mask 859 os::Solaris::hotspot_sigmask(thread); 860 861 log_info(os, thread)("Thread attached (tid: " UINTX_FORMAT ").", 862 os::current_thread_id()); 863 864 return true; 865 } 866 867 bool os::create_main_thread(JavaThread* thread) { 868 #ifdef ASSERT 869 thread->verify_not_published(); 870 #endif 871 if (_starting_thread == NULL) { 872 _starting_thread = create_os_thread(thread, main_thread); 873 if (_starting_thread == NULL) { 874 return false; 875 } 876 } 877 878 // The primodial thread is runnable from the start 879 _starting_thread->set_state(RUNNABLE); 880 881 thread->set_osthread(_starting_thread); 882 883 // initialize signal mask for this thread 884 // and save the caller's signal mask 885 os::Solaris::hotspot_sigmask(thread); 886 887 return true; 888 } 889 890 // Helper function to trace thread attributes, similar to os::Posix::describe_pthread_attr() 891 static char* describe_thr_create_attributes(char* buf, size_t buflen, 892 size_t stacksize, long flags) { 893 stringStream ss(buf, buflen); 894 ss.print("stacksize: " SIZE_FORMAT "k, ", stacksize / 1024); 895 ss.print("flags: "); 896 #define PRINT_FLAG(f) if (flags & f) ss.print( #f " "); 897 #define ALL(X) \ 898 X(THR_SUSPENDED) \ 899 X(THR_DETACHED) \ 900 X(THR_BOUND) \ 901 X(THR_NEW_LWP) \ 902 X(THR_DAEMON) 903 ALL(PRINT_FLAG) 904 #undef ALL 905 #undef PRINT_FLAG 906 return buf; 907 } 908 909 // return default stack size for thr_type 910 size_t os::Posix::default_stack_size(os::ThreadType thr_type) { 911 // default stack size when not specified by caller is 1M (2M for LP64) 912 size_t s = (BytesPerWord >> 2) * K * K; 913 return s; 914 } 915 916 bool os::create_thread(Thread* thread, ThreadType thr_type, 917 size_t req_stack_size) { 918 // Allocate the OSThread object 919 OSThread* osthread = new OSThread(NULL, NULL); 920 if (osthread == NULL) { 921 return false; 922 } 923 924 if (ThreadPriorityVerbose) { 925 char *thrtyp; 926 switch (thr_type) { 927 case vm_thread: 928 thrtyp = (char *)"vm"; 929 break; 930 case cgc_thread: 931 thrtyp = (char *)"cgc"; 932 break; 933 case pgc_thread: 934 thrtyp = (char *)"pgc"; 935 break; 936 case java_thread: 937 thrtyp = (char *)"java"; 938 break; 939 case compiler_thread: 940 thrtyp = (char *)"compiler"; 941 break; 942 case watcher_thread: 943 thrtyp = (char *)"watcher"; 944 break; 945 default: 946 thrtyp = (char *)"unknown"; 947 break; 948 } 949 tty->print_cr("In create_thread, creating a %s thread\n", thrtyp); 950 } 951 952 // calculate stack size if it's not specified by caller 953 size_t stack_size = os::Posix::get_initial_stack_size(thr_type, req_stack_size); 954 955 // Initial state is ALLOCATED but not INITIALIZED 956 osthread->set_state(ALLOCATED); 957 958 if (os::Solaris::_os_thread_count > os::Solaris::_os_thread_limit) { 959 // We got lots of threads. Check if we still have some address space left. 960 // Need to be at least 5Mb of unreserved address space. We do check by 961 // trying to reserve some. 962 const size_t VirtualMemoryBangSize = 20*K*K; 963 char* mem = os::reserve_memory(VirtualMemoryBangSize); 964 if (mem == NULL) { 965 delete osthread; 966 return false; 967 } else { 968 // Release the memory again 969 os::release_memory(mem, VirtualMemoryBangSize); 970 } 971 } 972 973 // Setup osthread because the child thread may need it. 974 thread->set_osthread(osthread); 975 976 // Create the Solaris thread 977 thread_t tid = 0; 978 long flags = (UseDetachedThreads ? THR_DETACHED : 0) | THR_SUSPENDED; 979 int status; 980 981 // Mark that we don't have an lwp or thread id yet. 982 // In case we attempt to set the priority before the thread starts. 983 osthread->set_lwp_id(-1); 984 osthread->set_thread_id(-1); 985 986 status = thr_create(NULL, stack_size, thread_native_entry, thread, flags, &tid); 987 988 char buf[64]; 989 if (status == 0) { 990 log_info(os, thread)("Thread started (tid: " UINTX_FORMAT ", attributes: %s). ", 991 (uintx) tid, describe_thr_create_attributes(buf, sizeof(buf), stack_size, flags)); 992 } else { 993 log_warning(os, thread)("Failed to start thread - thr_create failed (%s) for attributes: %s.", 994 os::errno_name(status), describe_thr_create_attributes(buf, sizeof(buf), stack_size, flags)); 995 } 996 997 if (status != 0) { 998 thread->set_osthread(NULL); 999 // Need to clean up stuff we've allocated so far 1000 delete osthread; 1001 return false; 1002 } 1003 1004 Atomic::inc(&os::Solaris::_os_thread_count); 1005 1006 // Store info on the Solaris thread into the OSThread 1007 osthread->set_thread_id(tid); 1008 1009 // Remember that we created this thread so we can set priority on it 1010 osthread->set_vm_created(); 1011 1012 // Most thread types will set an explicit priority before starting the thread, 1013 // but for those that don't we need a valid value to read back in thread_native_entry. 1014 osthread->set_native_priority(NormPriority); 1015 1016 // Initial thread state is INITIALIZED, not SUSPENDED 1017 osthread->set_state(INITIALIZED); 1018 1019 // The thread is returned suspended (in state INITIALIZED), and is started higher up in the call chain 1020 return true; 1021 } 1022 1023 debug_only(static bool signal_sets_initialized = false); 1024 static sigset_t unblocked_sigs, vm_sigs; 1025 1026 void os::Solaris::signal_sets_init() { 1027 // Should also have an assertion stating we are still single-threaded. 1028 assert(!signal_sets_initialized, "Already initialized"); 1029 // Fill in signals that are necessarily unblocked for all threads in 1030 // the VM. Currently, we unblock the following signals: 1031 // SHUTDOWN{1,2,3}_SIGNAL: for shutdown hooks support (unless over-ridden 1032 // by -Xrs (=ReduceSignalUsage)); 1033 // BREAK_SIGNAL which is unblocked only by the VM thread and blocked by all 1034 // other threads. The "ReduceSignalUsage" boolean tells us not to alter 1035 // the dispositions or masks wrt these signals. 1036 // Programs embedding the VM that want to use the above signals for their 1037 // own purposes must, at this time, use the "-Xrs" option to prevent 1038 // interference with shutdown hooks and BREAK_SIGNAL thread dumping. 1039 // (See bug 4345157, and other related bugs). 1040 // In reality, though, unblocking these signals is really a nop, since 1041 // these signals are not blocked by default. 1042 sigemptyset(&unblocked_sigs); 1043 sigaddset(&unblocked_sigs, SIGILL); 1044 sigaddset(&unblocked_sigs, SIGSEGV); 1045 sigaddset(&unblocked_sigs, SIGBUS); 1046 sigaddset(&unblocked_sigs, SIGFPE); 1047 sigaddset(&unblocked_sigs, ASYNC_SIGNAL); 1048 1049 if (!ReduceSignalUsage) { 1050 if (!os::Posix::is_sig_ignored(SHUTDOWN1_SIGNAL)) { 1051 sigaddset(&unblocked_sigs, SHUTDOWN1_SIGNAL); 1052 } 1053 if (!os::Posix::is_sig_ignored(SHUTDOWN2_SIGNAL)) { 1054 sigaddset(&unblocked_sigs, SHUTDOWN2_SIGNAL); 1055 } 1056 if (!os::Posix::is_sig_ignored(SHUTDOWN3_SIGNAL)) { 1057 sigaddset(&unblocked_sigs, SHUTDOWN3_SIGNAL); 1058 } 1059 } 1060 // Fill in signals that are blocked by all but the VM thread. 1061 sigemptyset(&vm_sigs); 1062 if (!ReduceSignalUsage) { 1063 sigaddset(&vm_sigs, BREAK_SIGNAL); 1064 } 1065 debug_only(signal_sets_initialized = true); 1066 1067 // For diagnostics only used in run_periodic_checks 1068 sigemptyset(&check_signal_done); 1069 } 1070 1071 // These are signals that are unblocked while a thread is running Java. 1072 // (For some reason, they get blocked by default.) 1073 sigset_t* os::Solaris::unblocked_signals() { 1074 assert(signal_sets_initialized, "Not initialized"); 1075 return &unblocked_sigs; 1076 } 1077 1078 // These are the signals that are blocked while a (non-VM) thread is 1079 // running Java. Only the VM thread handles these signals. 1080 sigset_t* os::Solaris::vm_signals() { 1081 assert(signal_sets_initialized, "Not initialized"); 1082 return &vm_sigs; 1083 } 1084 1085 // CR 7190089: on Solaris, primordial thread's stack needs adjusting. 1086 // Without the adjustment, stack size is incorrect if stack is set to unlimited (ulimit -s unlimited). 1087 void os::Solaris::correct_stack_boundaries_for_primordial_thread(Thread* thr) { 1088 assert(is_primordial_thread(), "Call only for primordial thread"); 1089 1090 JavaThread* jt = (JavaThread *)thr; 1091 assert(jt != NULL, "Sanity check"); 1092 size_t stack_size; 1093 address base = jt->stack_base(); 1094 if (Arguments::created_by_java_launcher()) { 1095 // Use 2MB to allow for Solaris 7 64 bit mode. 1096 stack_size = JavaThread::stack_size_at_create() == 0 1097 ? 2048*K : JavaThread::stack_size_at_create(); 1098 1099 // There are rare cases when we may have already used more than 1100 // the basic stack size allotment before this method is invoked. 1101 // Attempt to allow for a normally sized java_stack. 1102 size_t current_stack_offset = (size_t)(base - (address)&stack_size); 1103 stack_size += ReservedSpace::page_align_size_down(current_stack_offset); 1104 } else { 1105 // 6269555: If we were not created by a Java launcher, i.e. if we are 1106 // running embedded in a native application, treat the primordial thread 1107 // as much like a native attached thread as possible. This means using 1108 // the current stack size from thr_stksegment(), unless it is too large 1109 // to reliably setup guard pages. A reasonable max size is 8MB. 1110 size_t current_size = os::current_stack_size(); 1111 // This should never happen, but just in case.... 1112 if (current_size == 0) current_size = 2 * K * K; 1113 stack_size = current_size > (8 * K * K) ? (8 * K * K) : current_size; 1114 } 1115 address bottom = align_up(base - stack_size, os::vm_page_size());; 1116 stack_size = (size_t)(base - bottom); 1117 1118 assert(stack_size > 0, "Stack size calculation problem"); 1119 1120 if (stack_size > jt->stack_size()) { 1121 #ifndef PRODUCT 1122 struct rlimit limits; 1123 getrlimit(RLIMIT_STACK, &limits); 1124 size_t size = adjust_stack_size(base, (size_t)limits.rlim_cur); 1125 assert(size >= jt->stack_size(), "Stack size problem in main thread"); 1126 #endif 1127 tty->print_cr("Stack size of %d Kb exceeds current limit of %d Kb.\n" 1128 "(Stack sizes are rounded up to a multiple of the system page size.)\n" 1129 "See limit(1) to increase the stack size limit.", 1130 stack_size / K, jt->stack_size() / K); 1131 vm_exit(1); 1132 } 1133 assert(jt->stack_size() >= stack_size, 1134 "Attempt to map more stack than was allocated"); 1135 jt->set_stack_size(stack_size); 1136 1137 } 1138 1139 1140 1141 // Free Solaris resources related to the OSThread 1142 void os::free_thread(OSThread* osthread) { 1143 assert(osthread != NULL, "os::free_thread but osthread not set"); 1144 1145 // We are told to free resources of the argument thread, 1146 // but we can only really operate on the current thread. 1147 assert(Thread::current()->osthread() == osthread, 1148 "os::free_thread but not current thread"); 1149 1150 // Restore caller's signal mask 1151 sigset_t sigmask = osthread->caller_sigmask(); 1152 pthread_sigmask(SIG_SETMASK, &sigmask, NULL); 1153 1154 delete osthread; 1155 } 1156 1157 void os::pd_start_thread(Thread* thread) { 1158 int status = thr_continue(thread->osthread()->thread_id()); 1159 assert_status(status == 0, status, "thr_continue failed"); 1160 } 1161 1162 1163 intx os::current_thread_id() { 1164 return (intx)thr_self(); 1165 } 1166 1167 static pid_t _initial_pid = 0; 1168 1169 int os::current_process_id() { 1170 return (int)(_initial_pid ? _initial_pid : getpid()); 1171 } 1172 1173 // gethrtime() should be monotonic according to the documentation, 1174 // but some virtualized platforms are known to break this guarantee. 1175 // getTimeNanos() must be guaranteed not to move backwards, so we 1176 // are forced to add a check here. 1177 inline hrtime_t getTimeNanos() { 1178 const hrtime_t now = gethrtime(); 1179 const hrtime_t prev = max_hrtime; 1180 if (now <= prev) { 1181 return prev; // same or retrograde time; 1182 } 1183 const hrtime_t obsv = Atomic::cmpxchg(now, &max_hrtime, prev); 1184 assert(obsv >= prev, "invariant"); // Monotonicity 1185 // If the CAS succeeded then we're done and return "now". 1186 // If the CAS failed and the observed value "obsv" is >= now then 1187 // we should return "obsv". If the CAS failed and now > obsv > prv then 1188 // some other thread raced this thread and installed a new value, in which case 1189 // we could either (a) retry the entire operation, (b) retry trying to install now 1190 // or (c) just return obsv. We use (c). No loop is required although in some cases 1191 // we might discard a higher "now" value in deference to a slightly lower but freshly 1192 // installed obsv value. That's entirely benign -- it admits no new orderings compared 1193 // to (a) or (b) -- and greatly reduces coherence traffic. 1194 // We might also condition (c) on the magnitude of the delta between obsv and now. 1195 // Avoiding excessive CAS operations to hot RW locations is critical. 1196 // See https://blogs.oracle.com/dave/entry/cas_and_cache_trivia_invalidate 1197 return (prev == obsv) ? now : obsv; 1198 } 1199 1200 // Time since start-up in seconds to a fine granularity. 1201 // Used by VMSelfDestructTimer and the MemProfiler. 1202 double os::elapsedTime() { 1203 return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz; 1204 } 1205 1206 jlong os::elapsed_counter() { 1207 return (jlong)(getTimeNanos() - first_hrtime); 1208 } 1209 1210 jlong os::elapsed_frequency() { 1211 return hrtime_hz; 1212 } 1213 1214 // Return the real, user, and system times in seconds from an 1215 // arbitrary fixed point in the past. 1216 bool os::getTimesSecs(double* process_real_time, 1217 double* process_user_time, 1218 double* process_system_time) { 1219 struct tms ticks; 1220 clock_t real_ticks = times(&ticks); 1221 1222 if (real_ticks == (clock_t) (-1)) { 1223 return false; 1224 } else { 1225 double ticks_per_second = (double) clock_tics_per_sec; 1226 *process_user_time = ((double) ticks.tms_utime) / ticks_per_second; 1227 *process_system_time = ((double) ticks.tms_stime) / ticks_per_second; 1228 // For consistency return the real time from getTimeNanos() 1229 // converted to seconds. 1230 *process_real_time = ((double) getTimeNanos()) / ((double) NANOUNITS); 1231 1232 return true; 1233 } 1234 } 1235 1236 bool os::supports_vtime() { return true; } 1237 bool os::enable_vtime() { return false; } 1238 bool os::vtime_enabled() { return false; } 1239 1240 double os::elapsedVTime() { 1241 return (double)gethrvtime() / (double)hrtime_hz; 1242 } 1243 1244 // Must return millis since Jan 1 1970 for JVM_CurrentTimeMillis 1245 jlong os::javaTimeMillis() { 1246 timeval t; 1247 if (gettimeofday(&t, NULL) == -1) { 1248 fatal("os::javaTimeMillis: gettimeofday (%s)", os::strerror(errno)); 1249 } 1250 return jlong(t.tv_sec) * 1000 + jlong(t.tv_usec) / 1000; 1251 } 1252 1253 // Must return seconds+nanos since Jan 1 1970. This must use the same 1254 // time source as javaTimeMillis and can't use get_nsec_fromepoch as 1255 // we need better than 1ms accuracy 1256 void os::javaTimeSystemUTC(jlong &seconds, jlong &nanos) { 1257 timeval t; 1258 if (gettimeofday(&t, NULL) == -1) { 1259 fatal("os::javaTimeSystemUTC: gettimeofday (%s)", os::strerror(errno)); 1260 } 1261 seconds = jlong(t.tv_sec); 1262 nanos = jlong(t.tv_usec) * 1000; 1263 } 1264 1265 1266 jlong os::javaTimeNanos() { 1267 return (jlong)getTimeNanos(); 1268 } 1269 1270 void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) { 1271 info_ptr->max_value = ALL_64_BITS; // gethrtime() uses all 64 bits 1272 info_ptr->may_skip_backward = false; // not subject to resetting or drifting 1273 info_ptr->may_skip_forward = false; // not subject to resetting or drifting 1274 info_ptr->kind = JVMTI_TIMER_ELAPSED; // elapsed not CPU time 1275 } 1276 1277 char * os::local_time_string(char *buf, size_t buflen) { 1278 struct tm t; 1279 time_t long_time; 1280 time(&long_time); 1281 localtime_r(&long_time, &t); 1282 jio_snprintf(buf, buflen, "%d-%02d-%02d %02d:%02d:%02d", 1283 t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, 1284 t.tm_hour, t.tm_min, t.tm_sec); 1285 return buf; 1286 } 1287 1288 // Note: os::shutdown() might be called very early during initialization, or 1289 // called from signal handler. Before adding something to os::shutdown(), make 1290 // sure it is async-safe and can handle partially initialized VM. 1291 void os::shutdown() { 1292 1293 // allow PerfMemory to attempt cleanup of any persistent resources 1294 perfMemory_exit(); 1295 1296 // needs to remove object in file system 1297 AttachListener::abort(); 1298 1299 // flush buffered output, finish log files 1300 ostream_abort(); 1301 1302 // Check for abort hook 1303 abort_hook_t abort_hook = Arguments::abort_hook(); 1304 if (abort_hook != NULL) { 1305 abort_hook(); 1306 } 1307 } 1308 1309 // Note: os::abort() might be called very early during initialization, or 1310 // called from signal handler. Before adding something to os::abort(), make 1311 // sure it is async-safe and can handle partially initialized VM. 1312 void os::abort(bool dump_core, void* siginfo, const void* context) { 1313 os::shutdown(); 1314 if (dump_core) { 1315 #ifndef PRODUCT 1316 fdStream out(defaultStream::output_fd()); 1317 out.print_raw("Current thread is "); 1318 char buf[16]; 1319 jio_snprintf(buf, sizeof(buf), UINTX_FORMAT, os::current_thread_id()); 1320 out.print_raw_cr(buf); 1321 out.print_raw_cr("Dumping core ..."); 1322 #endif 1323 ::abort(); // dump core (for debugging) 1324 } 1325 1326 ::exit(1); 1327 } 1328 1329 // Die immediately, no exit hook, no abort hook, no cleanup. 1330 void os::die() { 1331 ::abort(); // dump core (for debugging) 1332 } 1333 1334 // DLL functions 1335 1336 const char* os::dll_file_extension() { return ".so"; } 1337 1338 // This must be hard coded because it's the system's temporary 1339 // directory not the java application's temp directory, ala java.io.tmpdir. 1340 const char* os::get_temp_directory() { return "/tmp"; } 1341 1342 // check if addr is inside libjvm.so 1343 bool os::address_is_in_vm(address addr) { 1344 static address libjvm_base_addr; 1345 Dl_info dlinfo; 1346 1347 if (libjvm_base_addr == NULL) { 1348 if (dladdr(CAST_FROM_FN_PTR(void *, os::address_is_in_vm), &dlinfo) != 0) { 1349 libjvm_base_addr = (address)dlinfo.dli_fbase; 1350 } 1351 assert(libjvm_base_addr !=NULL, "Cannot obtain base address for libjvm"); 1352 } 1353 1354 if (dladdr((void *)addr, &dlinfo) != 0) { 1355 if (libjvm_base_addr == (address)dlinfo.dli_fbase) return true; 1356 } 1357 1358 return false; 1359 } 1360 1361 typedef int (*dladdr1_func_type)(void *, Dl_info *, void **, int); 1362 static dladdr1_func_type dladdr1_func = NULL; 1363 1364 bool os::dll_address_to_function_name(address addr, char *buf, 1365 int buflen, int * offset, 1366 bool demangle) { 1367 // buf is not optional, but offset is optional 1368 assert(buf != NULL, "sanity check"); 1369 1370 Dl_info dlinfo; 1371 1372 // dladdr1_func was initialized in os::init() 1373 if (dladdr1_func != NULL) { 1374 // yes, we have dladdr1 1375 1376 // Support for dladdr1 is checked at runtime; it may be 1377 // available even if the vm is built on a machine that does 1378 // not have dladdr1 support. Make sure there is a value for 1379 // RTLD_DL_SYMENT. 1380 #ifndef RTLD_DL_SYMENT 1381 #define RTLD_DL_SYMENT 1 1382 #endif 1383 #ifdef _LP64 1384 Elf64_Sym * info; 1385 #else 1386 Elf32_Sym * info; 1387 #endif 1388 if (dladdr1_func((void *)addr, &dlinfo, (void **)&info, 1389 RTLD_DL_SYMENT) != 0) { 1390 // see if we have a matching symbol that covers our address 1391 if (dlinfo.dli_saddr != NULL && 1392 (char *)dlinfo.dli_saddr + info->st_size > (char *)addr) { 1393 if (dlinfo.dli_sname != NULL) { 1394 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) { 1395 jio_snprintf(buf, buflen, "%s", dlinfo.dli_sname); 1396 } 1397 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1398 return true; 1399 } 1400 } 1401 // no matching symbol so try for just file info 1402 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { 1403 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1404 buf, buflen, offset, dlinfo.dli_fname, demangle)) { 1405 return true; 1406 } 1407 } 1408 } 1409 buf[0] = '\0'; 1410 if (offset != NULL) *offset = -1; 1411 return false; 1412 } 1413 1414 // no, only dladdr is available 1415 if (dladdr((void *)addr, &dlinfo) != 0) { 1416 // see if we have a matching symbol 1417 if (dlinfo.dli_saddr != NULL && dlinfo.dli_sname != NULL) { 1418 if (!(demangle && Decoder::demangle(dlinfo.dli_sname, buf, buflen))) { 1419 jio_snprintf(buf, buflen, dlinfo.dli_sname); 1420 } 1421 if (offset != NULL) *offset = addr - (address)dlinfo.dli_saddr; 1422 return true; 1423 } 1424 // no matching symbol so try for just file info 1425 if (dlinfo.dli_fname != NULL && dlinfo.dli_fbase != NULL) { 1426 if (Decoder::decode((address)(addr - (address)dlinfo.dli_fbase), 1427 buf, buflen, offset, dlinfo.dli_fname, demangle)) { 1428 return true; 1429 } 1430 } 1431 } 1432 buf[0] = '\0'; 1433 if (offset != NULL) *offset = -1; 1434 return false; 1435 } 1436 1437 bool os::dll_address_to_library_name(address addr, char* buf, 1438 int buflen, int* offset) { 1439 // buf is not optional, but offset is optional 1440 assert(buf != NULL, "sanity check"); 1441 1442 Dl_info dlinfo; 1443 1444 if (dladdr((void*)addr, &dlinfo) != 0) { 1445 if (dlinfo.dli_fname != NULL) { 1446 jio_snprintf(buf, buflen, "%s", dlinfo.dli_fname); 1447 } 1448 if (dlinfo.dli_fbase != NULL && offset != NULL) { 1449 *offset = addr - (address)dlinfo.dli_fbase; 1450 } 1451 return true; 1452 } 1453 1454 buf[0] = '\0'; 1455 if (offset) *offset = -1; 1456 return false; 1457 } 1458 1459 int os::get_loaded_modules_info(os::LoadedModulesCallbackFunc callback, void *param) { 1460 Dl_info dli; 1461 // Sanity check? 1462 if (dladdr(CAST_FROM_FN_PTR(void *, os::get_loaded_modules_info), &dli) == 0 || 1463 dli.dli_fname == NULL) { 1464 return 1; 1465 } 1466 1467 void * handle = dlopen(dli.dli_fname, RTLD_LAZY); 1468 if (handle == NULL) { 1469 return 1; 1470 } 1471 1472 Link_map *map; 1473 dlinfo(handle, RTLD_DI_LINKMAP, &map); 1474 if (map == NULL) { 1475 dlclose(handle); 1476 return 1; 1477 } 1478 1479 while (map->l_prev != NULL) { 1480 map = map->l_prev; 1481 } 1482 1483 while (map != NULL) { 1484 // Iterate through all map entries and call callback with fields of interest 1485 if(callback(map->l_name, (address)map->l_addr, (address)0, param)) { 1486 dlclose(handle); 1487 return 1; 1488 } 1489 map = map->l_next; 1490 } 1491 1492 dlclose(handle); 1493 return 0; 1494 } 1495 1496 int _print_dll_info_cb(const char * name, address base_address, address top_address, void * param) { 1497 outputStream * out = (outputStream *) param; 1498 out->print_cr(PTR_FORMAT " \t%s", base_address, name); 1499 return 0; 1500 } 1501 1502 void os::print_dll_info(outputStream * st) { 1503 st->print_cr("Dynamic libraries:"); st->flush(); 1504 if (get_loaded_modules_info(_print_dll_info_cb, (void *)st)) { 1505 st->print_cr("Error: Cannot print dynamic libraries."); 1506 } 1507 } 1508 1509 // Loads .dll/.so and 1510 // in case of error it checks if .dll/.so was built for the 1511 // same architecture as Hotspot is running on 1512 1513 void * os::dll_load(const char *filename, char *ebuf, int ebuflen) { 1514 void * result= ::dlopen(filename, RTLD_LAZY); 1515 if (result != NULL) { 1516 // Successful loading 1517 return result; 1518 } 1519 1520 Elf32_Ehdr elf_head; 1521 1522 // Read system error message into ebuf 1523 // It may or may not be overwritten below 1524 ::strncpy(ebuf, ::dlerror(), ebuflen-1); 1525 ebuf[ebuflen-1]='\0'; 1526 int diag_msg_max_length=ebuflen-strlen(ebuf); 1527 char* diag_msg_buf=ebuf+strlen(ebuf); 1528 1529 if (diag_msg_max_length==0) { 1530 // No more space in ebuf for additional diagnostics message 1531 return NULL; 1532 } 1533 1534 1535 int file_descriptor= ::open(filename, O_RDONLY | O_NONBLOCK); 1536 1537 if (file_descriptor < 0) { 1538 // Can't open library, report dlerror() message 1539 return NULL; 1540 } 1541 1542 bool failed_to_read_elf_head= 1543 (sizeof(elf_head)!= 1544 (::read(file_descriptor, &elf_head,sizeof(elf_head)))); 1545 1546 ::close(file_descriptor); 1547 if (failed_to_read_elf_head) { 1548 // file i/o error - report dlerror() msg 1549 return NULL; 1550 } 1551 1552 typedef struct { 1553 Elf32_Half code; // Actual value as defined in elf.h 1554 Elf32_Half compat_class; // Compatibility of archs at VM's sense 1555 unsigned char elf_class; // 32 or 64 bit 1556 unsigned char endianess; // MSB or LSB 1557 char* name; // String representation 1558 } arch_t; 1559 1560 static const arch_t arch_array[]={ 1561 {EM_386, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1562 {EM_486, EM_386, ELFCLASS32, ELFDATA2LSB, (char*)"IA 32"}, 1563 {EM_IA_64, EM_IA_64, ELFCLASS64, ELFDATA2LSB, (char*)"IA 64"}, 1564 {EM_X86_64, EM_X86_64, ELFCLASS64, ELFDATA2LSB, (char*)"AMD 64"}, 1565 {EM_SPARC, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1566 {EM_SPARC32PLUS, EM_SPARC, ELFCLASS32, ELFDATA2MSB, (char*)"Sparc 32"}, 1567 {EM_SPARCV9, EM_SPARCV9, ELFCLASS64, ELFDATA2MSB, (char*)"Sparc v9 64"}, 1568 {EM_PPC, EM_PPC, ELFCLASS32, ELFDATA2MSB, (char*)"Power PC 32"}, 1569 {EM_PPC64, EM_PPC64, ELFCLASS64, ELFDATA2MSB, (char*)"Power PC 64"}, 1570 {EM_ARM, EM_ARM, ELFCLASS32, ELFDATA2LSB, (char*)"ARM 32"} 1571 }; 1572 1573 #if (defined IA32) 1574 static Elf32_Half running_arch_code=EM_386; 1575 #elif (defined AMD64) 1576 static Elf32_Half running_arch_code=EM_X86_64; 1577 #elif (defined IA64) 1578 static Elf32_Half running_arch_code=EM_IA_64; 1579 #elif (defined __sparc) && (defined _LP64) 1580 static Elf32_Half running_arch_code=EM_SPARCV9; 1581 #elif (defined __sparc) && (!defined _LP64) 1582 static Elf32_Half running_arch_code=EM_SPARC; 1583 #elif (defined __powerpc64__) 1584 static Elf32_Half running_arch_code=EM_PPC64; 1585 #elif (defined __powerpc__) 1586 static Elf32_Half running_arch_code=EM_PPC; 1587 #elif (defined ARM) 1588 static Elf32_Half running_arch_code=EM_ARM; 1589 #else 1590 #error Method os::dll_load requires that one of following is defined:\ 1591 IA32, AMD64, IA64, __sparc, __powerpc__, ARM, ARM 1592 #endif 1593 1594 // Identify compatability class for VM's architecture and library's architecture 1595 // Obtain string descriptions for architectures 1596 1597 arch_t lib_arch={elf_head.e_machine,0,elf_head.e_ident[EI_CLASS], elf_head.e_ident[EI_DATA], NULL}; 1598 int running_arch_index=-1; 1599 1600 for (unsigned int i=0; i < ARRAY_SIZE(arch_array); i++) { 1601 if (running_arch_code == arch_array[i].code) { 1602 running_arch_index = i; 1603 } 1604 if (lib_arch.code == arch_array[i].code) { 1605 lib_arch.compat_class = arch_array[i].compat_class; 1606 lib_arch.name = arch_array[i].name; 1607 } 1608 } 1609 1610 assert(running_arch_index != -1, 1611 "Didn't find running architecture code (running_arch_code) in arch_array"); 1612 if (running_arch_index == -1) { 1613 // Even though running architecture detection failed 1614 // we may still continue with reporting dlerror() message 1615 return NULL; 1616 } 1617 1618 if (lib_arch.endianess != arch_array[running_arch_index].endianess) { 1619 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: endianness mismatch)"); 1620 return NULL; 1621 } 1622 1623 if (lib_arch.elf_class != arch_array[running_arch_index].elf_class) { 1624 ::snprintf(diag_msg_buf, diag_msg_max_length-1," (Possible cause: architecture word width mismatch)"); 1625 return NULL; 1626 } 1627 1628 if (lib_arch.compat_class != arch_array[running_arch_index].compat_class) { 1629 if (lib_arch.name!=NULL) { 1630 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1631 " (Possible cause: can't load %s-bit .so on a %s-bit platform)", 1632 lib_arch.name, arch_array[running_arch_index].name); 1633 } else { 1634 ::snprintf(diag_msg_buf, diag_msg_max_length-1, 1635 " (Possible cause: can't load this .so (machine code=0x%x) on a %s-bit platform)", 1636 lib_arch.code, 1637 arch_array[running_arch_index].name); 1638 } 1639 } 1640 1641 return NULL; 1642 } 1643 1644 void* os::dll_lookup(void* handle, const char* name) { 1645 return dlsym(handle, name); 1646 } 1647 1648 void* os::get_default_process_handle() { 1649 return (void*)::dlopen(NULL, RTLD_LAZY); 1650 } 1651 1652 static inline time_t get_mtime(const char* filename) { 1653 struct stat st; 1654 int ret = os::stat(filename, &st); 1655 assert(ret == 0, "failed to stat() file '%s': %s", filename, os::strerror(errno)); 1656 return st.st_mtime; 1657 } 1658 1659 int os::compare_file_modified_times(const char* file1, const char* file2) { 1660 time_t t1 = get_mtime(file1); 1661 time_t t2 = get_mtime(file2); 1662 return t1 - t2; 1663 } 1664 1665 static bool _print_ascii_file(const char* filename, outputStream* st) { 1666 int fd = ::open(filename, O_RDONLY); 1667 if (fd == -1) { 1668 return false; 1669 } 1670 1671 char buf[32]; 1672 int bytes; 1673 while ((bytes = ::read(fd, buf, sizeof(buf))) > 0) { 1674 st->print_raw(buf, bytes); 1675 } 1676 1677 ::close(fd); 1678 1679 return true; 1680 } 1681 1682 void os::print_os_info_brief(outputStream* st) { 1683 os::Solaris::print_distro_info(st); 1684 1685 os::Posix::print_uname_info(st); 1686 1687 os::Solaris::print_libversion_info(st); 1688 } 1689 1690 void os::print_os_info(outputStream* st) { 1691 st->print("OS:"); 1692 1693 os::Solaris::print_distro_info(st); 1694 1695 os::Posix::print_uname_info(st); 1696 1697 os::Solaris::print_libversion_info(st); 1698 1699 os::Posix::print_rlimit_info(st); 1700 1701 os::Posix::print_load_average(st); 1702 } 1703 1704 void os::Solaris::print_distro_info(outputStream* st) { 1705 if (!_print_ascii_file("/etc/release", st)) { 1706 st->print("Solaris"); 1707 } 1708 st->cr(); 1709 } 1710 1711 void os::get_summary_os_info(char* buf, size_t buflen) { 1712 strncpy(buf, "Solaris", buflen); // default to plain solaris 1713 FILE* fp = fopen("/etc/release", "r"); 1714 if (fp != NULL) { 1715 char tmp[256]; 1716 // Only get the first line and chop out everything but the os name. 1717 if (fgets(tmp, sizeof(tmp), fp)) { 1718 char* ptr = tmp; 1719 // skip past whitespace characters 1720 while (*ptr != '\0' && (*ptr == ' ' || *ptr == '\t' || *ptr == '\n')) ptr++; 1721 if (*ptr != '\0') { 1722 char* nl = strchr(ptr, '\n'); 1723 if (nl != NULL) *nl = '\0'; 1724 strncpy(buf, ptr, buflen); 1725 } 1726 } 1727 fclose(fp); 1728 } 1729 } 1730 1731 void os::Solaris::print_libversion_info(outputStream* st) { 1732 st->print(" (T2 libthread)"); 1733 st->cr(); 1734 } 1735 1736 static bool check_addr0(outputStream* st) { 1737 jboolean status = false; 1738 const int read_chunk = 200; 1739 int ret = 0; 1740 int nmap = 0; 1741 int fd = ::open("/proc/self/map",O_RDONLY); 1742 if (fd >= 0) { 1743 prmap_t *p = NULL; 1744 char *mbuff = (char *) calloc(read_chunk, sizeof(prmap_t)); 1745 if (NULL == mbuff) { 1746 ::close(fd); 1747 return status; 1748 } 1749 while ((ret = ::read(fd, mbuff, read_chunk*sizeof(prmap_t))) > 0) { 1750 //check if read() has not read partial data 1751 if( 0 != ret % sizeof(prmap_t)){ 1752 break; 1753 } 1754 nmap = ret / sizeof(prmap_t); 1755 p = (prmap_t *)mbuff; 1756 for(int i = 0; i < nmap; i++){ 1757 if (p->pr_vaddr == 0x0) { 1758 st->print("Warning: Address: " PTR_FORMAT ", Size: " SIZE_FORMAT "K, ",p->pr_vaddr, p->pr_size/1024); 1759 st->print("Mapped file: %s, ", p->pr_mapname[0] == '\0' ? "None" : p->pr_mapname); 1760 st->print("Access: "); 1761 st->print("%s",(p->pr_mflags & MA_READ) ? "r" : "-"); 1762 st->print("%s",(p->pr_mflags & MA_WRITE) ? "w" : "-"); 1763 st->print("%s",(p->pr_mflags & MA_EXEC) ? "x" : "-"); 1764 st->cr(); 1765 status = true; 1766 } 1767 p++; 1768 } 1769 } 1770 free(mbuff); 1771 ::close(fd); 1772 } 1773 return status; 1774 } 1775 1776 void os::get_summary_cpu_info(char* buf, size_t buflen) { 1777 // Get MHz with system call. We don't seem to already have this. 1778 processor_info_t stats; 1779 processorid_t id = getcpuid(); 1780 int clock = 0; 1781 if (processor_info(id, &stats) != -1) { 1782 clock = stats.pi_clock; // pi_processor_type isn't more informative than below 1783 } 1784 #ifdef AMD64 1785 snprintf(buf, buflen, "x86 64 bit %d MHz", clock); 1786 #else 1787 // must be sparc 1788 snprintf(buf, buflen, "Sparcv9 64 bit %d MHz", clock); 1789 #endif 1790 } 1791 1792 void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) { 1793 // Nothing to do for now. 1794 } 1795 1796 void os::print_memory_info(outputStream* st) { 1797 st->print("Memory:"); 1798 st->print(" %dk page", os::vm_page_size()>>10); 1799 st->print(", physical " UINT64_FORMAT "k", os::physical_memory()>>10); 1800 st->print("(" UINT64_FORMAT "k free)", os::available_memory() >> 10); 1801 st->cr(); 1802 (void) check_addr0(st); 1803 } 1804 1805 // Moved from whole group, because we need them here for diagnostic 1806 // prints. 1807 static int Maxsignum = 0; 1808 static int *ourSigFlags = NULL; 1809 1810 int os::Solaris::get_our_sigflags(int sig) { 1811 assert(ourSigFlags!=NULL, "signal data structure not initialized"); 1812 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range"); 1813 return ourSigFlags[sig]; 1814 } 1815 1816 void os::Solaris::set_our_sigflags(int sig, int flags) { 1817 assert(ourSigFlags!=NULL, "signal data structure not initialized"); 1818 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range"); 1819 ourSigFlags[sig] = flags; 1820 } 1821 1822 1823 static const char* get_signal_handler_name(address handler, 1824 char* buf, int buflen) { 1825 int offset; 1826 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 1827 if (found) { 1828 // skip directory names 1829 const char *p1, *p2; 1830 p1 = buf; 1831 size_t len = strlen(os::file_separator()); 1832 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 1833 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); 1834 } else { 1835 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 1836 } 1837 return buf; 1838 } 1839 1840 static void print_signal_handler(outputStream* st, int sig, 1841 char* buf, size_t buflen) { 1842 struct sigaction sa; 1843 1844 sigaction(sig, NULL, &sa); 1845 1846 st->print("%s: ", os::exception_name(sig, buf, buflen)); 1847 1848 address handler = (sa.sa_flags & SA_SIGINFO) 1849 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 1850 : CAST_FROM_FN_PTR(address, sa.sa_handler); 1851 1852 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 1853 st->print("SIG_DFL"); 1854 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 1855 st->print("SIG_IGN"); 1856 } else { 1857 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 1858 } 1859 1860 st->print(", sa_mask[0]="); 1861 os::Posix::print_signal_set_short(st, &sa.sa_mask); 1862 1863 address rh = VMError::get_resetted_sighandler(sig); 1864 // May be, handler was resetted by VMError? 1865 if (rh != NULL) { 1866 handler = rh; 1867 sa.sa_flags = VMError::get_resetted_sigflags(sig); 1868 } 1869 1870 st->print(", sa_flags="); 1871 os::Posix::print_sa_flags(st, sa.sa_flags); 1872 1873 // Check: is it our handler? 1874 if (handler == CAST_FROM_FN_PTR(address, signalHandler)) { 1875 // It is our signal handler 1876 // check for flags 1877 if (sa.sa_flags != os::Solaris::get_our_sigflags(sig)) { 1878 st->print( 1879 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", 1880 os::Solaris::get_our_sigflags(sig)); 1881 } 1882 } 1883 st->cr(); 1884 } 1885 1886 void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 1887 st->print_cr("Signal Handlers:"); 1888 print_signal_handler(st, SIGSEGV, buf, buflen); 1889 print_signal_handler(st, SIGBUS , buf, buflen); 1890 print_signal_handler(st, SIGFPE , buf, buflen); 1891 print_signal_handler(st, SIGPIPE, buf, buflen); 1892 print_signal_handler(st, SIGXFSZ, buf, buflen); 1893 print_signal_handler(st, SIGILL , buf, buflen); 1894 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen); 1895 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); 1896 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen); 1897 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); 1898 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen); 1899 } 1900 1901 static char saved_jvm_path[MAXPATHLEN] = { 0 }; 1902 1903 // Find the full path to the current module, libjvm.so 1904 void os::jvm_path(char *buf, jint buflen) { 1905 // Error checking. 1906 if (buflen < MAXPATHLEN) { 1907 assert(false, "must use a large-enough buffer"); 1908 buf[0] = '\0'; 1909 return; 1910 } 1911 // Lazy resolve the path to current module. 1912 if (saved_jvm_path[0] != 0) { 1913 strcpy(buf, saved_jvm_path); 1914 return; 1915 } 1916 1917 Dl_info dlinfo; 1918 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo); 1919 assert(ret != 0, "cannot locate libjvm"); 1920 if (ret != 0 && dlinfo.dli_fname != NULL) { 1921 if (os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen) == NULL) { 1922 return; 1923 } 1924 } else { 1925 buf[0] = '\0'; 1926 return; 1927 } 1928 1929 if (Arguments::sun_java_launcher_is_altjvm()) { 1930 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical 1931 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so". 1932 // If "/jre/lib/" appears at the right place in the string, then 1933 // assume we are installed in a JDK and we're done. Otherwise, check 1934 // for a JAVA_HOME environment variable and fix up the path so it 1935 // looks like libjvm.so is installed there (append a fake suffix 1936 // hotspot/libjvm.so). 1937 const char *p = buf + strlen(buf) - 1; 1938 for (int count = 0; p > buf && count < 5; ++count) { 1939 for (--p; p > buf && *p != '/'; --p) 1940 /* empty */ ; 1941 } 1942 1943 if (strncmp(p, "/jre/lib/", 9) != 0) { 1944 // Look for JAVA_HOME in the environment. 1945 char* java_home_var = ::getenv("JAVA_HOME"); 1946 if (java_home_var != NULL && java_home_var[0] != 0) { 1947 char* jrelib_p; 1948 int len; 1949 1950 // Check the current module name "libjvm.so". 1951 p = strrchr(buf, '/'); 1952 assert(strstr(p, "/libjvm") == p, "invalid library name"); 1953 1954 if (os::Posix::realpath(java_home_var, buf, buflen) == NULL) { 1955 return; 1956 } 1957 // determine if this is a legacy image or modules image 1958 // modules image doesn't have "jre" subdirectory 1959 len = strlen(buf); 1960 assert(len < buflen, "Ran out of buffer space"); 1961 jrelib_p = buf + len; 1962 snprintf(jrelib_p, buflen-len, "/jre/lib"); 1963 if (0 != access(buf, F_OK)) { 1964 snprintf(jrelib_p, buflen-len, "/lib"); 1965 } 1966 1967 if (0 == access(buf, F_OK)) { 1968 // Use current module name "libjvm.so" 1969 len = strlen(buf); 1970 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so"); 1971 } else { 1972 // Go back to path of .so 1973 if (os::Posix::realpath((char *)dlinfo.dli_fname, buf, buflen) == NULL) { 1974 return; 1975 } 1976 } 1977 } 1978 } 1979 } 1980 1981 strncpy(saved_jvm_path, buf, MAXPATHLEN); 1982 saved_jvm_path[MAXPATHLEN - 1] = '\0'; 1983 } 1984 1985 1986 void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 1987 // no prefix required, not even "_" 1988 } 1989 1990 1991 void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 1992 // no suffix required 1993 } 1994 1995 // sun.misc.Signal 1996 1997 extern "C" { 1998 static void UserHandler(int sig, void *siginfo, void *context) { 1999 // Ctrl-C is pressed during error reporting, likely because the error 2000 // handler fails to abort. Let VM die immediately. 2001 if (sig == SIGINT && VMError::is_error_reported()) { 2002 os::die(); 2003 } 2004 2005 os::signal_notify(sig); 2006 // We do not need to reinstate the signal handler each time... 2007 } 2008 } 2009 2010 void* os::user_handler() { 2011 return CAST_FROM_FN_PTR(void*, UserHandler); 2012 } 2013 2014 static struct timespec create_semaphore_timespec(unsigned int sec, int nsec) { 2015 struct timespec ts; 2016 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec); 2017 2018 return ts; 2019 } 2020 2021 extern "C" { 2022 typedef void (*sa_handler_t)(int); 2023 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); 2024 } 2025 2026 void* os::signal(int signal_number, void* handler) { 2027 struct sigaction sigAct, oldSigAct; 2028 sigfillset(&(sigAct.sa_mask)); 2029 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND; 2030 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); 2031 2032 if (sigaction(signal_number, &sigAct, &oldSigAct)) { 2033 // -1 means registration failed 2034 return (void *)-1; 2035 } 2036 2037 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); 2038 } 2039 2040 void os::signal_raise(int signal_number) { 2041 raise(signal_number); 2042 } 2043 2044 // The following code is moved from os.cpp for making this 2045 // code platform specific, which it is by its very nature. 2046 2047 // a counter for each possible signal value 2048 static int Sigexit = 0; 2049 static jint *pending_signals = NULL; 2050 static int *preinstalled_sigs = NULL; 2051 static struct sigaction *chainedsigactions = NULL; 2052 static Semaphore* sig_sem = NULL; 2053 2054 int os::sigexitnum_pd() { 2055 assert(Sigexit > 0, "signal memory not yet initialized"); 2056 return Sigexit; 2057 } 2058 2059 void os::Solaris::init_signal_mem() { 2060 // Initialize signal structures 2061 Maxsignum = SIGRTMAX; 2062 Sigexit = Maxsignum+1; 2063 assert(Maxsignum >0, "Unable to obtain max signal number"); 2064 2065 // Initialize signal structures 2066 // pending_signals has one int per signal 2067 // The additional signal is for SIGEXIT - exit signal to signal_thread 2068 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal); 2069 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1))); 2070 2071 if (UseSignalChaining) { 2072 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction) 2073 * (Maxsignum + 1), mtInternal); 2074 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1))); 2075 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1), mtInternal); 2076 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1))); 2077 } 2078 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1), mtInternal); 2079 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1)); 2080 } 2081 2082 static void jdk_misc_signal_init() { 2083 // Initialize signal semaphore 2084 sig_sem = new Semaphore(); 2085 } 2086 2087 void os::signal_notify(int sig) { 2088 if (sig_sem != NULL) { 2089 Atomic::inc(&pending_signals[sig]); 2090 sig_sem->signal(); 2091 } else { 2092 // Signal thread is not created with ReduceSignalUsage and jdk_misc_signal_init 2093 // initialization isn't called. 2094 assert(ReduceSignalUsage, "signal semaphore should be created"); 2095 } 2096 } 2097 2098 static int check_pending_signals() { 2099 int ret; 2100 while (true) { 2101 for (int i = 0; i < Sigexit + 1; i++) { 2102 jint n = pending_signals[i]; 2103 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 2104 return i; 2105 } 2106 } 2107 JavaThread *thread = JavaThread::current(); 2108 ThreadBlockInVM tbivm(thread); 2109 2110 bool threadIsSuspended; 2111 do { 2112 thread->set_suspend_equivalent(); 2113 sig_sem->wait(); 2114 2115 // were we externally suspended while we were waiting? 2116 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2117 if (threadIsSuspended) { 2118 // The semaphore has been incremented, but while we were waiting 2119 // another thread suspended us. We don't want to continue running 2120 // while suspended because that would surprise the thread that 2121 // suspended us. 2122 sig_sem->signal(); 2123 2124 thread->java_suspend_self(); 2125 } 2126 } while (threadIsSuspended); 2127 } 2128 } 2129 2130 int os::signal_wait() { 2131 return check_pending_signals(); 2132 } 2133 2134 //////////////////////////////////////////////////////////////////////////////// 2135 // Virtual Memory 2136 2137 static int page_size = -1; 2138 2139 int os::vm_page_size() { 2140 assert(page_size != -1, "must call os::init"); 2141 return page_size; 2142 } 2143 2144 // Solaris allocates memory by pages. 2145 int os::vm_allocation_granularity() { 2146 assert(page_size != -1, "must call os::init"); 2147 return page_size; 2148 } 2149 2150 static bool recoverable_mmap_error(int err) { 2151 // See if the error is one we can let the caller handle. This 2152 // list of errno values comes from the Solaris mmap(2) man page. 2153 switch (err) { 2154 case EBADF: 2155 case EINVAL: 2156 case ENOTSUP: 2157 // let the caller deal with these errors 2158 return true; 2159 2160 default: 2161 // Any remaining errors on this OS can cause our reserved mapping 2162 // to be lost. That can cause confusion where different data 2163 // structures think they have the same memory mapped. The worst 2164 // scenario is if both the VM and a library think they have the 2165 // same memory mapped. 2166 return false; 2167 } 2168 } 2169 2170 static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec, 2171 int err) { 2172 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 2173 ", %d) failed; error='%s' (errno=%d)", addr, bytes, exec, 2174 os::strerror(err), err); 2175 } 2176 2177 static void warn_fail_commit_memory(char* addr, size_t bytes, 2178 size_t alignment_hint, bool exec, 2179 int err) { 2180 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 2181 ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, bytes, 2182 alignment_hint, exec, os::strerror(err), err); 2183 } 2184 2185 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, bool exec) { 2186 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; 2187 size_t size = bytes; 2188 char *res = Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot); 2189 if (res != NULL) { 2190 if (UseNUMAInterleaving) { 2191 numa_make_global(addr, bytes); 2192 } 2193 return 0; 2194 } 2195 2196 int err = errno; // save errno from mmap() call in mmap_chunk() 2197 2198 if (!recoverable_mmap_error(err)) { 2199 warn_fail_commit_memory(addr, bytes, exec, err); 2200 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "committing reserved memory."); 2201 } 2202 2203 return err; 2204 } 2205 2206 bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) { 2207 return Solaris::commit_memory_impl(addr, bytes, exec) == 0; 2208 } 2209 2210 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, bool exec, 2211 const char* mesg) { 2212 assert(mesg != NULL, "mesg must be specified"); 2213 int err = os::Solaris::commit_memory_impl(addr, bytes, exec); 2214 if (err != 0) { 2215 // the caller wants all commit errors to exit with the specified mesg: 2216 warn_fail_commit_memory(addr, bytes, exec, err); 2217 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg); 2218 } 2219 } 2220 2221 size_t os::Solaris::page_size_for_alignment(size_t alignment) { 2222 assert(is_aligned(alignment, (size_t) vm_page_size()), 2223 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, 2224 alignment, (size_t) vm_page_size()); 2225 2226 for (int i = 0; _page_sizes[i] != 0; i++) { 2227 if (is_aligned(alignment, _page_sizes[i])) { 2228 return _page_sizes[i]; 2229 } 2230 } 2231 2232 return (size_t) vm_page_size(); 2233 } 2234 2235 int os::Solaris::commit_memory_impl(char* addr, size_t bytes, 2236 size_t alignment_hint, bool exec) { 2237 int err = Solaris::commit_memory_impl(addr, bytes, exec); 2238 if (err == 0 && UseLargePages && alignment_hint > 0) { 2239 assert(is_aligned(bytes, alignment_hint), 2240 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, alignment_hint); 2241 2242 // The syscall memcntl requires an exact page size (see man memcntl for details). 2243 size_t page_size = page_size_for_alignment(alignment_hint); 2244 if (page_size > (size_t) vm_page_size()) { 2245 (void)Solaris::setup_large_pages(addr, bytes, page_size); 2246 } 2247 } 2248 return err; 2249 } 2250 2251 bool os::pd_commit_memory(char* addr, size_t bytes, size_t alignment_hint, 2252 bool exec) { 2253 return Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec) == 0; 2254 } 2255 2256 void os::pd_commit_memory_or_exit(char* addr, size_t bytes, 2257 size_t alignment_hint, bool exec, 2258 const char* mesg) { 2259 assert(mesg != NULL, "mesg must be specified"); 2260 int err = os::Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec); 2261 if (err != 0) { 2262 // the caller wants all commit errors to exit with the specified mesg: 2263 warn_fail_commit_memory(addr, bytes, alignment_hint, exec, err); 2264 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg); 2265 } 2266 } 2267 2268 // Uncommit the pages in a specified region. 2269 void os::pd_free_memory(char* addr, size_t bytes, size_t alignment_hint) { 2270 if (madvise(addr, bytes, MADV_FREE) < 0) { 2271 debug_only(warning("MADV_FREE failed.")); 2272 return; 2273 } 2274 } 2275 2276 bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 2277 return os::commit_memory(addr, size, !ExecMem); 2278 } 2279 2280 bool os::remove_stack_guard_pages(char* addr, size_t size) { 2281 return os::uncommit_memory(addr, size); 2282 } 2283 2284 // Change the page size in a given range. 2285 void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 2286 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned."); 2287 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned."); 2288 if (UseLargePages) { 2289 size_t page_size = Solaris::page_size_for_alignment(alignment_hint); 2290 if (page_size > (size_t) vm_page_size()) { 2291 Solaris::setup_large_pages(addr, bytes, page_size); 2292 } 2293 } 2294 } 2295 2296 // Tell the OS to make the range local to the first-touching LWP 2297 void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { 2298 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned."); 2299 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) { 2300 debug_only(warning("MADV_ACCESS_LWP failed.")); 2301 } 2302 } 2303 2304 // Tell the OS that this range would be accessed from different LWPs. 2305 void os::numa_make_global(char *addr, size_t bytes) { 2306 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned."); 2307 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) { 2308 debug_only(warning("MADV_ACCESS_MANY failed.")); 2309 } 2310 } 2311 2312 // Get the number of the locality groups. 2313 size_t os::numa_get_groups_num() { 2314 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie()); 2315 return n != -1 ? n : 1; 2316 } 2317 2318 // Get a list of leaf locality groups. A leaf lgroup is group that 2319 // doesn't have any children. Typical leaf group is a CPU or a CPU/memory 2320 // board. An LWP is assigned to one of these groups upon creation. 2321 size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2322 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) { 2323 ids[0] = 0; 2324 return 1; 2325 } 2326 int result_size = 0, top = 1, bottom = 0, cur = 0; 2327 for (int k = 0; k < size; k++) { 2328 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur], 2329 (Solaris::lgrp_id_t*)&ids[top], size - top); 2330 if (r == -1) { 2331 ids[0] = 0; 2332 return 1; 2333 } 2334 if (!r) { 2335 // That's a leaf node. 2336 assert(bottom <= cur, "Sanity check"); 2337 // Check if the node has memory 2338 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur], 2339 NULL, 0, LGRP_RSRC_MEM) > 0) { 2340 ids[bottom++] = ids[cur]; 2341 } 2342 } 2343 top += r; 2344 cur++; 2345 } 2346 if (bottom == 0) { 2347 // Handle a situation, when the OS reports no memory available. 2348 // Assume UMA architecture. 2349 ids[0] = 0; 2350 return 1; 2351 } 2352 return bottom; 2353 } 2354 2355 // Detect the topology change. Typically happens during CPU plugging-unplugging. 2356 bool os::numa_topology_changed() { 2357 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie()); 2358 if (is_stale != -1 && is_stale) { 2359 Solaris::lgrp_fini(Solaris::lgrp_cookie()); 2360 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER); 2361 assert(c != 0, "Failure to initialize LGRP API"); 2362 Solaris::set_lgrp_cookie(c); 2363 return true; 2364 } 2365 return false; 2366 } 2367 2368 // Get the group id of the current LWP. 2369 int os::numa_get_group_id() { 2370 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID); 2371 if (lgrp_id == -1) { 2372 return 0; 2373 } 2374 const int size = os::numa_get_groups_num(); 2375 int *ids = (int*)alloca(size * sizeof(int)); 2376 2377 // Get the ids of all lgroups with memory; r is the count. 2378 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id, 2379 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM); 2380 if (r <= 0) { 2381 return 0; 2382 } 2383 return ids[os::random() % r]; 2384 } 2385 2386 // Request information about the page. 2387 bool os::get_page_info(char *start, page_info* info) { 2388 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE }; 2389 uint64_t addr = (uintptr_t)start; 2390 uint64_t outdata[2]; 2391 uint_t validity = 0; 2392 2393 if (meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) { 2394 return false; 2395 } 2396 2397 info->size = 0; 2398 info->lgrp_id = -1; 2399 2400 if ((validity & 1) != 0) { 2401 if ((validity & 2) != 0) { 2402 info->lgrp_id = outdata[0]; 2403 } 2404 if ((validity & 4) != 0) { 2405 info->size = outdata[1]; 2406 } 2407 return true; 2408 } 2409 return false; 2410 } 2411 2412 // Scan the pages from start to end until a page different than 2413 // the one described in the info parameter is encountered. 2414 char *os::scan_pages(char *start, char* end, page_info* page_expected, 2415 page_info* page_found) { 2416 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE }; 2417 const size_t types = sizeof(info_types) / sizeof(info_types[0]); 2418 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT + 1]; 2419 uint_t validity[MAX_MEMINFO_CNT]; 2420 2421 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size); 2422 uint64_t p = (uint64_t)start; 2423 while (p < (uint64_t)end) { 2424 addrs[0] = p; 2425 size_t addrs_count = 1; 2426 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] + page_size < (uint64_t)end) { 2427 addrs[addrs_count] = addrs[addrs_count - 1] + page_size; 2428 addrs_count++; 2429 } 2430 2431 if (meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) { 2432 return NULL; 2433 } 2434 2435 size_t i = 0; 2436 for (; i < addrs_count; i++) { 2437 if ((validity[i] & 1) != 0) { 2438 if ((validity[i] & 4) != 0) { 2439 if (outdata[types * i + 1] != page_expected->size) { 2440 break; 2441 } 2442 } else if (page_expected->size != 0) { 2443 break; 2444 } 2445 2446 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) { 2447 if (outdata[types * i] != page_expected->lgrp_id) { 2448 break; 2449 } 2450 } 2451 } else { 2452 return NULL; 2453 } 2454 } 2455 2456 if (i < addrs_count) { 2457 if ((validity[i] & 2) != 0) { 2458 page_found->lgrp_id = outdata[types * i]; 2459 } else { 2460 page_found->lgrp_id = -1; 2461 } 2462 if ((validity[i] & 4) != 0) { 2463 page_found->size = outdata[types * i + 1]; 2464 } else { 2465 page_found->size = 0; 2466 } 2467 return (char*)addrs[i]; 2468 } 2469 2470 p = addrs[addrs_count - 1] + page_size; 2471 } 2472 return end; 2473 } 2474 2475 bool os::pd_uncommit_memory(char* addr, size_t bytes) { 2476 size_t size = bytes; 2477 // Map uncommitted pages PROT_NONE so we fail early if we touch an 2478 // uncommitted page. Otherwise, the read/write might succeed if we 2479 // have enough swap space to back the physical page. 2480 return 2481 NULL != Solaris::mmap_chunk(addr, size, 2482 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, 2483 PROT_NONE); 2484 } 2485 2486 char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) { 2487 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0); 2488 2489 if (b == MAP_FAILED) { 2490 return NULL; 2491 } 2492 return b; 2493 } 2494 2495 char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes, 2496 size_t alignment_hint, bool fixed) { 2497 char* addr = requested_addr; 2498 int flags = MAP_PRIVATE | MAP_NORESERVE; 2499 2500 assert(!(fixed && (alignment_hint > 0)), 2501 "alignment hint meaningless with fixed mmap"); 2502 2503 if (fixed) { 2504 flags |= MAP_FIXED; 2505 } else if (alignment_hint > (size_t) vm_page_size()) { 2506 flags |= MAP_ALIGN; 2507 addr = (char*) alignment_hint; 2508 } 2509 2510 // Map uncommitted pages PROT_NONE so we fail early if we touch an 2511 // uncommitted page. Otherwise, the read/write might succeed if we 2512 // have enough swap space to back the physical page. 2513 return mmap_chunk(addr, bytes, flags, PROT_NONE); 2514 } 2515 2516 char* os::pd_reserve_memory(size_t bytes, char* requested_addr, 2517 size_t alignment_hint) { 2518 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint, 2519 (requested_addr != NULL)); 2520 2521 guarantee(requested_addr == NULL || requested_addr == addr, 2522 "OS failed to return requested mmap address."); 2523 return addr; 2524 } 2525 2526 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr, int file_desc) { 2527 assert(file_desc >= 0, "file_desc is not valid"); 2528 char* result = pd_attempt_reserve_memory_at(bytes, requested_addr); 2529 if (result != NULL) { 2530 if (replace_existing_mapping_with_file_mapping(result, bytes, file_desc) == NULL) { 2531 vm_exit_during_initialization(err_msg("Error in mapping Java heap at the given filesystem directory")); 2532 } 2533 } 2534 return result; 2535 } 2536 2537 // Reserve memory at an arbitrary address, only if that area is 2538 // available (and not reserved for something else). 2539 2540 char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2541 const int max_tries = 10; 2542 char* base[max_tries]; 2543 size_t size[max_tries]; 2544 2545 // Solaris adds a gap between mmap'ed regions. The size of the gap 2546 // is dependent on the requested size and the MMU. Our initial gap 2547 // value here is just a guess and will be corrected later. 2548 bool had_top_overlap = false; 2549 bool have_adjusted_gap = false; 2550 size_t gap = 0x400000; 2551 2552 // Assert only that the size is a multiple of the page size, since 2553 // that's all that mmap requires, and since that's all we really know 2554 // about at this low abstraction level. If we need higher alignment, 2555 // we can either pass an alignment to this method or verify alignment 2556 // in one of the methods further up the call chain. See bug 5044738. 2557 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); 2558 2559 // Since snv_84, Solaris attempts to honor the address hint - see 5003415. 2560 // Give it a try, if the kernel honors the hint we can return immediately. 2561 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false); 2562 2563 volatile int err = errno; 2564 if (addr == requested_addr) { 2565 return addr; 2566 } else if (addr != NULL) { 2567 pd_unmap_memory(addr, bytes); 2568 } 2569 2570 if (log_is_enabled(Warning, os)) { 2571 char buf[256]; 2572 buf[0] = '\0'; 2573 if (addr == NULL) { 2574 jio_snprintf(buf, sizeof(buf), ": %s", os::strerror(err)); 2575 } 2576 log_info(os)("attempt_reserve_memory_at: couldn't reserve " SIZE_FORMAT " bytes at " 2577 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT 2578 "%s", bytes, requested_addr, addr, buf); 2579 } 2580 2581 // Address hint method didn't work. Fall back to the old method. 2582 // In theory, once SNV becomes our oldest supported platform, this 2583 // code will no longer be needed. 2584 // 2585 // Repeatedly allocate blocks until the block is allocated at the 2586 // right spot. Give up after max_tries. 2587 int i; 2588 for (i = 0; i < max_tries; ++i) { 2589 base[i] = reserve_memory(bytes); 2590 2591 if (base[i] != NULL) { 2592 // Is this the block we wanted? 2593 if (base[i] == requested_addr) { 2594 size[i] = bytes; 2595 break; 2596 } 2597 2598 // check that the gap value is right 2599 if (had_top_overlap && !have_adjusted_gap) { 2600 size_t actual_gap = base[i-1] - base[i] - bytes; 2601 if (gap != actual_gap) { 2602 // adjust the gap value and retry the last 2 allocations 2603 assert(i > 0, "gap adjustment code problem"); 2604 have_adjusted_gap = true; // adjust the gap only once, just in case 2605 gap = actual_gap; 2606 log_info(os)("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap); 2607 unmap_memory(base[i], bytes); 2608 unmap_memory(base[i-1], size[i-1]); 2609 i-=2; 2610 continue; 2611 } 2612 } 2613 2614 // Does this overlap the block we wanted? Give back the overlapped 2615 // parts and try again. 2616 // 2617 // There is still a bug in this code: if top_overlap == bytes, 2618 // the overlap is offset from requested region by the value of gap. 2619 // In this case giving back the overlapped part will not work, 2620 // because we'll give back the entire block at base[i] and 2621 // therefore the subsequent allocation will not generate a new gap. 2622 // This could be fixed with a new algorithm that used larger 2623 // or variable size chunks to find the requested region - 2624 // but such a change would introduce additional complications. 2625 // It's rare enough that the planets align for this bug, 2626 // so we'll just wait for a fix for 6204603/5003415 which 2627 // will provide a mmap flag to allow us to avoid this business. 2628 2629 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; 2630 if (top_overlap >= 0 && top_overlap < bytes) { 2631 had_top_overlap = true; 2632 unmap_memory(base[i], top_overlap); 2633 base[i] += top_overlap; 2634 size[i] = bytes - top_overlap; 2635 } else { 2636 size_t bottom_overlap = base[i] + bytes - requested_addr; 2637 if (bottom_overlap >= 0 && bottom_overlap < bytes) { 2638 if (bottom_overlap == 0) { 2639 log_info(os)("attempt_reserve_memory_at: possible alignment bug"); 2640 } 2641 unmap_memory(requested_addr, bottom_overlap); 2642 size[i] = bytes - bottom_overlap; 2643 } else { 2644 size[i] = bytes; 2645 } 2646 } 2647 } 2648 } 2649 2650 // Give back the unused reserved pieces. 2651 2652 for (int j = 0; j < i; ++j) { 2653 if (base[j] != NULL) { 2654 unmap_memory(base[j], size[j]); 2655 } 2656 } 2657 2658 return (i < max_tries) ? requested_addr : NULL; 2659 } 2660 2661 bool os::pd_release_memory(char* addr, size_t bytes) { 2662 size_t size = bytes; 2663 return munmap(addr, size) == 0; 2664 } 2665 2666 static bool solaris_mprotect(char* addr, size_t bytes, int prot) { 2667 assert(addr == (char*)align_down((uintptr_t)addr, os::vm_page_size()), 2668 "addr must be page aligned"); 2669 int retVal = mprotect(addr, bytes, prot); 2670 return retVal == 0; 2671 } 2672 2673 // Protect memory (Used to pass readonly pages through 2674 // JNI GetArray<type>Elements with empty arrays.) 2675 // Also, used for serialization page and for compressed oops null pointer 2676 // checking. 2677 bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 2678 bool is_committed) { 2679 unsigned int p = 0; 2680 switch (prot) { 2681 case MEM_PROT_NONE: p = PROT_NONE; break; 2682 case MEM_PROT_READ: p = PROT_READ; break; 2683 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; 2684 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; 2685 default: 2686 ShouldNotReachHere(); 2687 } 2688 // is_committed is unused. 2689 return solaris_mprotect(addr, bytes, p); 2690 } 2691 2692 // guard_memory and unguard_memory only happens within stack guard pages. 2693 // Since ISM pertains only to the heap, guard and unguard memory should not 2694 /// happen with an ISM region. 2695 bool os::guard_memory(char* addr, size_t bytes) { 2696 return solaris_mprotect(addr, bytes, PROT_NONE); 2697 } 2698 2699 bool os::unguard_memory(char* addr, size_t bytes) { 2700 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE); 2701 } 2702 2703 // Large page support 2704 static size_t _large_page_size = 0; 2705 2706 // Insertion sort for small arrays (descending order). 2707 static void insertion_sort_descending(size_t* array, int len) { 2708 for (int i = 0; i < len; i++) { 2709 size_t val = array[i]; 2710 for (size_t key = i; key > 0 && array[key - 1] < val; --key) { 2711 size_t tmp = array[key]; 2712 array[key] = array[key - 1]; 2713 array[key - 1] = tmp; 2714 } 2715 } 2716 } 2717 2718 bool os::Solaris::mpss_sanity_check(bool warn, size_t* page_size) { 2719 const unsigned int usable_count = VM_Version::page_size_count(); 2720 if (usable_count == 1) { 2721 return false; 2722 } 2723 2724 // Find the right getpagesizes interface. When solaris 11 is the minimum 2725 // build platform, getpagesizes() (without the '2') can be called directly. 2726 typedef int (*gps_t)(size_t[], int); 2727 gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2")); 2728 if (gps_func == NULL) { 2729 gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes")); 2730 if (gps_func == NULL) { 2731 if (warn) { 2732 warning("MPSS is not supported by the operating system."); 2733 } 2734 return false; 2735 } 2736 } 2737 2738 // Fill the array of page sizes. 2739 int n = (*gps_func)(_page_sizes, page_sizes_max); 2740 assert(n > 0, "Solaris bug?"); 2741 2742 if (n == page_sizes_max) { 2743 // Add a sentinel value (necessary only if the array was completely filled 2744 // since it is static (zeroed at initialization)). 2745 _page_sizes[--n] = 0; 2746 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");) 2747 } 2748 assert(_page_sizes[n] == 0, "missing sentinel"); 2749 trace_page_sizes("available page sizes", _page_sizes, n); 2750 2751 if (n == 1) return false; // Only one page size available. 2752 2753 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and 2754 // select up to usable_count elements. First sort the array, find the first 2755 // acceptable value, then copy the usable sizes to the top of the array and 2756 // trim the rest. Make sure to include the default page size :-). 2757 // 2758 // A better policy could get rid of the 4M limit by taking the sizes of the 2759 // important VM memory regions (java heap and possibly the code cache) into 2760 // account. 2761 insertion_sort_descending(_page_sizes, n); 2762 const size_t size_limit = 2763 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes; 2764 int beg; 2765 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */; 2766 const int end = MIN2((int)usable_count, n) - 1; 2767 for (int cur = 0; cur < end; ++cur, ++beg) { 2768 _page_sizes[cur] = _page_sizes[beg]; 2769 } 2770 _page_sizes[end] = vm_page_size(); 2771 _page_sizes[end + 1] = 0; 2772 2773 if (_page_sizes[end] > _page_sizes[end - 1]) { 2774 // Default page size is not the smallest; sort again. 2775 insertion_sort_descending(_page_sizes, end + 1); 2776 } 2777 *page_size = _page_sizes[0]; 2778 2779 trace_page_sizes("usable page sizes", _page_sizes, end + 1); 2780 return true; 2781 } 2782 2783 void os::large_page_init() { 2784 if (UseLargePages) { 2785 // print a warning if any large page related flag is specified on command line 2786 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || 2787 !FLAG_IS_DEFAULT(LargePageSizeInBytes); 2788 2789 UseLargePages = Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size); 2790 } 2791 } 2792 2793 bool os::Solaris::is_valid_page_size(size_t bytes) { 2794 for (int i = 0; _page_sizes[i] != 0; i++) { 2795 if (_page_sizes[i] == bytes) { 2796 return true; 2797 } 2798 } 2799 return false; 2800 } 2801 2802 bool os::Solaris::setup_large_pages(caddr_t start, size_t bytes, size_t align) { 2803 assert(is_valid_page_size(align), SIZE_FORMAT " is not a valid page size", align); 2804 assert(is_aligned((void*) start, align), 2805 PTR_FORMAT " is not aligned to " SIZE_FORMAT, p2i((void*) start), align); 2806 assert(is_aligned(bytes, align), 2807 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, align); 2808 2809 // Signal to OS that we want large pages for addresses 2810 // from addr, addr + bytes 2811 struct memcntl_mha mpss_struct; 2812 mpss_struct.mha_cmd = MHA_MAPSIZE_VA; 2813 mpss_struct.mha_pagesize = align; 2814 mpss_struct.mha_flags = 0; 2815 // Upon successful completion, memcntl() returns 0 2816 if (memcntl(start, bytes, MC_HAT_ADVISE, (caddr_t) &mpss_struct, 0, 0)) { 2817 debug_only(warning("Attempt to use MPSS failed.")); 2818 return false; 2819 } 2820 return true; 2821 } 2822 2823 char* os::reserve_memory_special(size_t size, size_t alignment, char* addr, bool exec) { 2824 fatal("os::reserve_memory_special should not be called on Solaris."); 2825 return NULL; 2826 } 2827 2828 bool os::release_memory_special(char* base, size_t bytes) { 2829 fatal("os::release_memory_special should not be called on Solaris."); 2830 return false; 2831 } 2832 2833 size_t os::large_page_size() { 2834 return _large_page_size; 2835 } 2836 2837 // MPSS allows application to commit large page memory on demand; with ISM 2838 // the entire memory region must be allocated as shared memory. 2839 bool os::can_commit_large_page_memory() { 2840 return true; 2841 } 2842 2843 bool os::can_execute_large_page_memory() { 2844 return true; 2845 } 2846 2847 // Read calls from inside the vm need to perform state transitions 2848 size_t os::read(int fd, void *buf, unsigned int nBytes) { 2849 size_t res; 2850 JavaThread* thread = (JavaThread*)Thread::current(); 2851 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm"); 2852 ThreadBlockInVM tbiv(thread); 2853 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res); 2854 return res; 2855 } 2856 2857 size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) { 2858 size_t res; 2859 JavaThread* thread = (JavaThread*)Thread::current(); 2860 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm"); 2861 ThreadBlockInVM tbiv(thread); 2862 RESTARTABLE(::pread(fd, buf, (size_t) nBytes, offset), res); 2863 return res; 2864 } 2865 2866 size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) { 2867 size_t res; 2868 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 2869 "Assumed _thread_in_native"); 2870 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res); 2871 return res; 2872 } 2873 2874 void os::naked_short_sleep(jlong ms) { 2875 assert(ms < 1000, "Un-interruptable sleep, short time use only"); 2876 2877 // usleep is deprecated and removed from POSIX, in favour of nanosleep, but 2878 // Solaris requires -lrt for this. 2879 usleep((ms * 1000)); 2880 2881 return; 2882 } 2883 2884 // Sleep forever; naked call to OS-specific sleep; use with CAUTION 2885 void os::infinite_sleep() { 2886 while (true) { // sleep forever ... 2887 ::sleep(100); // ... 100 seconds at a time 2888 } 2889 } 2890 2891 // Used to convert frequent JVM_Yield() to nops 2892 bool os::dont_yield() { 2893 if (DontYieldALot) { 2894 static hrtime_t last_time = 0; 2895 hrtime_t diff = getTimeNanos() - last_time; 2896 2897 if (diff < DontYieldALotInterval * 1000000) { 2898 return true; 2899 } 2900 2901 last_time += diff; 2902 2903 return false; 2904 } else { 2905 return false; 2906 } 2907 } 2908 2909 // Note that yield semantics are defined by the scheduling class to which 2910 // the thread currently belongs. Typically, yield will _not yield to 2911 // other equal or higher priority threads that reside on the dispatch queues 2912 // of other CPUs. 2913 2914 void os::naked_yield() { 2915 thr_yield(); 2916 } 2917 2918 // Interface for setting lwp priorities. We are using T2 libthread, 2919 // which forces the use of bound threads, so all of our threads will 2920 // be assigned to real lwp's. Using the thr_setprio function is 2921 // meaningless in this mode so we must adjust the real lwp's priority. 2922 // The routines below implement the getting and setting of lwp priorities. 2923 // 2924 // Note: There are three priority scales used on Solaris. Java priotities 2925 // which range from 1 to 10, libthread "thr_setprio" scale which range 2926 // from 0 to 127, and the current scheduling class of the process we 2927 // are running in. This is typically from -60 to +60. 2928 // The setting of the lwp priorities in done after a call to thr_setprio 2929 // so Java priorities are mapped to libthread priorities and we map from 2930 // the latter to lwp priorities. We don't keep priorities stored in 2931 // Java priorities since some of our worker threads want to set priorities 2932 // higher than all Java threads. 2933 // 2934 // For related information: 2935 // (1) man -s 2 priocntl 2936 // (2) man -s 4 priocntl 2937 // (3) man dispadmin 2938 // = librt.so 2939 // = libthread/common/rtsched.c - thrp_setlwpprio(). 2940 // = ps -cL <pid> ... to validate priority. 2941 // = sched_get_priority_min and _max 2942 // pthread_create 2943 // sched_setparam 2944 // pthread_setschedparam 2945 // 2946 // Assumptions: 2947 // + We assume that all threads in the process belong to the same 2948 // scheduling class. IE. an homogenous process. 2949 // + Must be root or in IA group to change change "interactive" attribute. 2950 // Priocntl() will fail silently. The only indication of failure is when 2951 // we read-back the value and notice that it hasn't changed. 2952 // + Interactive threads enter the runq at the head, non-interactive at the tail. 2953 // + For RT, change timeslice as well. Invariant: 2954 // constant "priority integral" 2955 // Konst == TimeSlice * (60-Priority) 2956 // Given a priority, compute appropriate timeslice. 2957 // + Higher numerical values have higher priority. 2958 2959 // sched class attributes 2960 typedef struct { 2961 int schedPolicy; // classID 2962 int maxPrio; 2963 int minPrio; 2964 } SchedInfo; 2965 2966 2967 static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits; 2968 2969 #ifdef ASSERT 2970 static int ReadBackValidate = 1; 2971 #endif 2972 static int myClass = 0; 2973 static int myMin = 0; 2974 static int myMax = 0; 2975 static int myCur = 0; 2976 static bool priocntl_enable = false; 2977 2978 static const int criticalPrio = FXCriticalPriority; 2979 static int java_MaxPriority_to_os_priority = 0; // Saved mapping 2980 2981 2982 // lwp_priocntl_init 2983 // 2984 // Try to determine the priority scale for our process. 2985 // 2986 // Return errno or 0 if OK. 2987 // 2988 static int lwp_priocntl_init() { 2989 int rslt; 2990 pcinfo_t ClassInfo; 2991 pcparms_t ParmInfo; 2992 int i; 2993 2994 if (!UseThreadPriorities) return 0; 2995 2996 // If ThreadPriorityPolicy is 1, switch tables 2997 if (ThreadPriorityPolicy == 1) { 2998 for (i = 0; i < CriticalPriority+1; i++) 2999 os::java_to_os_priority[i] = prio_policy1[i]; 3000 } 3001 if (UseCriticalJavaThreadPriority) { 3002 // MaxPriority always maps to the FX scheduling class and criticalPrio. 3003 // See set_native_priority() and set_lwp_class_and_priority(). 3004 // Save original MaxPriority mapping in case attempt to 3005 // use critical priority fails. 3006 java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority]; 3007 // Set negative to distinguish from other priorities 3008 os::java_to_os_priority[MaxPriority] = -criticalPrio; 3009 } 3010 3011 // Get IDs for a set of well-known scheduling classes. 3012 // TODO-FIXME: GETCLINFO returns the current # of classes in the 3013 // the system. We should have a loop that iterates over the 3014 // classID values, which are known to be "small" integers. 3015 3016 strcpy(ClassInfo.pc_clname, "TS"); 3017 ClassInfo.pc_cid = -1; 3018 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3019 if (rslt < 0) return errno; 3020 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1"); 3021 tsLimits.schedPolicy = ClassInfo.pc_cid; 3022 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri; 3023 tsLimits.minPrio = -tsLimits.maxPrio; 3024 3025 strcpy(ClassInfo.pc_clname, "IA"); 3026 ClassInfo.pc_cid = -1; 3027 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3028 if (rslt < 0) return errno; 3029 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1"); 3030 iaLimits.schedPolicy = ClassInfo.pc_cid; 3031 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri; 3032 iaLimits.minPrio = -iaLimits.maxPrio; 3033 3034 strcpy(ClassInfo.pc_clname, "RT"); 3035 ClassInfo.pc_cid = -1; 3036 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3037 if (rslt < 0) return errno; 3038 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1"); 3039 rtLimits.schedPolicy = ClassInfo.pc_cid; 3040 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri; 3041 rtLimits.minPrio = 0; 3042 3043 strcpy(ClassInfo.pc_clname, "FX"); 3044 ClassInfo.pc_cid = -1; 3045 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3046 if (rslt < 0) return errno; 3047 assert(ClassInfo.pc_cid != -1, "cid for FX class is -1"); 3048 fxLimits.schedPolicy = ClassInfo.pc_cid; 3049 fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri; 3050 fxLimits.minPrio = 0; 3051 3052 // Query our "current" scheduling class. 3053 // This will normally be IA, TS or, rarely, FX or RT. 3054 memset(&ParmInfo, 0, sizeof(ParmInfo)); 3055 ParmInfo.pc_cid = PC_CLNULL; 3056 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo); 3057 if (rslt < 0) return errno; 3058 myClass = ParmInfo.pc_cid; 3059 3060 // We now know our scheduling classId, get specific information 3061 // about the class. 3062 ClassInfo.pc_cid = myClass; 3063 ClassInfo.pc_clname[0] = 0; 3064 rslt = priocntl((idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo); 3065 if (rslt < 0) return errno; 3066 3067 if (ThreadPriorityVerbose) { 3068 tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname); 3069 } 3070 3071 memset(&ParmInfo, 0, sizeof(pcparms_t)); 3072 ParmInfo.pc_cid = PC_CLNULL; 3073 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo); 3074 if (rslt < 0) return errno; 3075 3076 if (ParmInfo.pc_cid == rtLimits.schedPolicy) { 3077 myMin = rtLimits.minPrio; 3078 myMax = rtLimits.maxPrio; 3079 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { 3080 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms; 3081 myMin = iaLimits.minPrio; 3082 myMax = iaLimits.maxPrio; 3083 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict 3084 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { 3085 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms; 3086 myMin = tsLimits.minPrio; 3087 myMax = tsLimits.maxPrio; 3088 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict 3089 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) { 3090 fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms; 3091 myMin = fxLimits.minPrio; 3092 myMax = fxLimits.maxPrio; 3093 myMax = MIN2(myMax, (int)fxInfo->fx_uprilim); // clamp - restrict 3094 } else { 3095 // No clue - punt 3096 if (ThreadPriorityVerbose) { 3097 tty->print_cr("Unknown scheduling class: %s ... \n", 3098 ClassInfo.pc_clname); 3099 } 3100 return EINVAL; // no clue, punt 3101 } 3102 3103 if (ThreadPriorityVerbose) { 3104 tty->print_cr("Thread priority Range: [%d..%d]\n", myMin, myMax); 3105 } 3106 3107 priocntl_enable = true; // Enable changing priorities 3108 return 0; 3109 } 3110 3111 #define IAPRI(x) ((iaparms_t *)((x).pc_clparms)) 3112 #define RTPRI(x) ((rtparms_t *)((x).pc_clparms)) 3113 #define TSPRI(x) ((tsparms_t *)((x).pc_clparms)) 3114 #define FXPRI(x) ((fxparms_t *)((x).pc_clparms)) 3115 3116 3117 // scale_to_lwp_priority 3118 // 3119 // Convert from the libthread "thr_setprio" scale to our current 3120 // lwp scheduling class scale. 3121 // 3122 static int scale_to_lwp_priority(int rMin, int rMax, int x) { 3123 int v; 3124 3125 if (x == 127) return rMax; // avoid round-down 3126 v = (((x*(rMax-rMin)))/128)+rMin; 3127 return v; 3128 } 3129 3130 3131 // set_lwp_class_and_priority 3132 int set_lwp_class_and_priority(int ThreadID, int lwpid, 3133 int newPrio, int new_class, bool scale) { 3134 int rslt; 3135 int Actual, Expected, prv; 3136 pcparms_t ParmInfo; // for GET-SET 3137 #ifdef ASSERT 3138 pcparms_t ReadBack; // for readback 3139 #endif 3140 3141 // Set priority via PC_GETPARMS, update, PC_SETPARMS 3142 // Query current values. 3143 // TODO: accelerate this by eliminating the PC_GETPARMS call. 3144 // Cache "pcparms_t" in global ParmCache. 3145 // TODO: elide set-to-same-value 3146 3147 // If something went wrong on init, don't change priorities. 3148 if (!priocntl_enable) { 3149 if (ThreadPriorityVerbose) { 3150 tty->print_cr("Trying to set priority but init failed, ignoring"); 3151 } 3152 return EINVAL; 3153 } 3154 3155 // If lwp hasn't started yet, just return 3156 // the _start routine will call us again. 3157 if (lwpid <= 0) { 3158 if (ThreadPriorityVerbose) { 3159 tty->print_cr("deferring the set_lwp_class_and_priority of thread " 3160 INTPTR_FORMAT " to %d, lwpid not set", 3161 ThreadID, newPrio); 3162 } 3163 return 0; 3164 } 3165 3166 if (ThreadPriorityVerbose) { 3167 tty->print_cr ("set_lwp_class_and_priority(" 3168 INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ", 3169 ThreadID, lwpid, newPrio); 3170 } 3171 3172 memset(&ParmInfo, 0, sizeof(pcparms_t)); 3173 ParmInfo.pc_cid = PC_CLNULL; 3174 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo); 3175 if (rslt < 0) return errno; 3176 3177 int cur_class = ParmInfo.pc_cid; 3178 ParmInfo.pc_cid = (id_t)new_class; 3179 3180 if (new_class == rtLimits.schedPolicy) { 3181 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms; 3182 rtInfo->rt_pri = scale ? scale_to_lwp_priority(rtLimits.minPrio, 3183 rtLimits.maxPrio, newPrio) 3184 : newPrio; 3185 rtInfo->rt_tqsecs = RT_NOCHANGE; 3186 rtInfo->rt_tqnsecs = RT_NOCHANGE; 3187 if (ThreadPriorityVerbose) { 3188 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri); 3189 } 3190 } else if (new_class == iaLimits.schedPolicy) { 3191 iaparms_t* iaInfo = (iaparms_t*)ParmInfo.pc_clparms; 3192 int maxClamped = MIN2(iaLimits.maxPrio, 3193 cur_class == new_class 3194 ? (int)iaInfo->ia_uprilim : iaLimits.maxPrio); 3195 iaInfo->ia_upri = scale ? scale_to_lwp_priority(iaLimits.minPrio, 3196 maxClamped, newPrio) 3197 : newPrio; 3198 iaInfo->ia_uprilim = cur_class == new_class 3199 ? IA_NOCHANGE : (pri_t)iaLimits.maxPrio; 3200 iaInfo->ia_mode = IA_NOCHANGE; 3201 if (ThreadPriorityVerbose) { 3202 tty->print_cr("IA: [%d...%d] %d->%d\n", 3203 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri); 3204 } 3205 } else if (new_class == tsLimits.schedPolicy) { 3206 tsparms_t* tsInfo = (tsparms_t*)ParmInfo.pc_clparms; 3207 int maxClamped = MIN2(tsLimits.maxPrio, 3208 cur_class == new_class 3209 ? (int)tsInfo->ts_uprilim : tsLimits.maxPrio); 3210 tsInfo->ts_upri = scale ? scale_to_lwp_priority(tsLimits.minPrio, 3211 maxClamped, newPrio) 3212 : newPrio; 3213 tsInfo->ts_uprilim = cur_class == new_class 3214 ? TS_NOCHANGE : (pri_t)tsLimits.maxPrio; 3215 if (ThreadPriorityVerbose) { 3216 tty->print_cr("TS: [%d...%d] %d->%d\n", 3217 tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri); 3218 } 3219 } else if (new_class == fxLimits.schedPolicy) { 3220 fxparms_t* fxInfo = (fxparms_t*)ParmInfo.pc_clparms; 3221 int maxClamped = MIN2(fxLimits.maxPrio, 3222 cur_class == new_class 3223 ? (int)fxInfo->fx_uprilim : fxLimits.maxPrio); 3224 fxInfo->fx_upri = scale ? scale_to_lwp_priority(fxLimits.minPrio, 3225 maxClamped, newPrio) 3226 : newPrio; 3227 fxInfo->fx_uprilim = cur_class == new_class 3228 ? FX_NOCHANGE : (pri_t)fxLimits.maxPrio; 3229 fxInfo->fx_tqsecs = FX_NOCHANGE; 3230 fxInfo->fx_tqnsecs = FX_NOCHANGE; 3231 if (ThreadPriorityVerbose) { 3232 tty->print_cr("FX: [%d...%d] %d->%d\n", 3233 fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri); 3234 } 3235 } else { 3236 if (ThreadPriorityVerbose) { 3237 tty->print_cr("Unknown new scheduling class %d\n", new_class); 3238 } 3239 return EINVAL; // no clue, punt 3240 } 3241 3242 rslt = priocntl(P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo); 3243 if (ThreadPriorityVerbose && rslt) { 3244 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno); 3245 } 3246 if (rslt < 0) return errno; 3247 3248 #ifdef ASSERT 3249 // Sanity check: read back what we just attempted to set. 3250 // In theory it could have changed in the interim ... 3251 // 3252 // The priocntl system call is tricky. 3253 // Sometimes it'll validate the priority value argument and 3254 // return EINVAL if unhappy. At other times it fails silently. 3255 // Readbacks are prudent. 3256 3257 if (!ReadBackValidate) return 0; 3258 3259 memset(&ReadBack, 0, sizeof(pcparms_t)); 3260 ReadBack.pc_cid = PC_CLNULL; 3261 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack); 3262 assert(rslt >= 0, "priocntl failed"); 3263 Actual = Expected = 0xBAD; 3264 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match"); 3265 if (ParmInfo.pc_cid == rtLimits.schedPolicy) { 3266 Actual = RTPRI(ReadBack)->rt_pri; 3267 Expected = RTPRI(ParmInfo)->rt_pri; 3268 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { 3269 Actual = IAPRI(ReadBack)->ia_upri; 3270 Expected = IAPRI(ParmInfo)->ia_upri; 3271 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { 3272 Actual = TSPRI(ReadBack)->ts_upri; 3273 Expected = TSPRI(ParmInfo)->ts_upri; 3274 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) { 3275 Actual = FXPRI(ReadBack)->fx_upri; 3276 Expected = FXPRI(ParmInfo)->fx_upri; 3277 } else { 3278 if (ThreadPriorityVerbose) { 3279 tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n", 3280 ParmInfo.pc_cid); 3281 } 3282 } 3283 3284 if (Actual != Expected) { 3285 if (ThreadPriorityVerbose) { 3286 tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n", 3287 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected); 3288 } 3289 } 3290 #endif 3291 3292 return 0; 3293 } 3294 3295 // Solaris only gives access to 128 real priorities at a time, 3296 // so we expand Java's ten to fill this range. This would be better 3297 // if we dynamically adjusted relative priorities. 3298 // 3299 // The ThreadPriorityPolicy option allows us to select 2 different 3300 // priority scales. 3301 // 3302 // ThreadPriorityPolicy=0 3303 // Since the Solaris' default priority is MaximumPriority, we do not 3304 // set a priority lower than Max unless a priority lower than 3305 // NormPriority is requested. 3306 // 3307 // ThreadPriorityPolicy=1 3308 // This mode causes the priority table to get filled with 3309 // linear values. NormPriority get's mapped to 50% of the 3310 // Maximum priority an so on. This will cause VM threads 3311 // to get unfair treatment against other Solaris processes 3312 // which do not explicitly alter their thread priorities. 3313 3314 int os::java_to_os_priority[CriticalPriority + 1] = { 3315 -99999, // 0 Entry should never be used 3316 3317 0, // 1 MinPriority 3318 32, // 2 3319 64, // 3 3320 3321 96, // 4 3322 127, // 5 NormPriority 3323 127, // 6 3324 3325 127, // 7 3326 127, // 8 3327 127, // 9 NearMaxPriority 3328 3329 127, // 10 MaxPriority 3330 3331 -criticalPrio // 11 CriticalPriority 3332 }; 3333 3334 OSReturn os::set_native_priority(Thread* thread, int newpri) { 3335 OSThread* osthread = thread->osthread(); 3336 3337 // Save requested priority in case the thread hasn't been started 3338 osthread->set_native_priority(newpri); 3339 3340 // Check for critical priority request 3341 bool fxcritical = false; 3342 if (newpri == -criticalPrio) { 3343 fxcritical = true; 3344 newpri = criticalPrio; 3345 } 3346 3347 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping"); 3348 if (!UseThreadPriorities) return OS_OK; 3349 3350 int status = 0; 3351 3352 if (!fxcritical) { 3353 // Use thr_setprio only if we have a priority that thr_setprio understands 3354 status = thr_setprio(thread->osthread()->thread_id(), newpri); 3355 } 3356 3357 int lwp_status = 3358 set_lwp_class_and_priority(osthread->thread_id(), 3359 osthread->lwp_id(), 3360 newpri, 3361 fxcritical ? fxLimits.schedPolicy : myClass, 3362 !fxcritical); 3363 if (lwp_status != 0 && fxcritical) { 3364 // Try again, this time without changing the scheduling class 3365 newpri = java_MaxPriority_to_os_priority; 3366 lwp_status = set_lwp_class_and_priority(osthread->thread_id(), 3367 osthread->lwp_id(), 3368 newpri, myClass, false); 3369 } 3370 status |= lwp_status; 3371 return (status == 0) ? OS_OK : OS_ERR; 3372 } 3373 3374 3375 OSReturn os::get_native_priority(const Thread* const thread, 3376 int *priority_ptr) { 3377 int p; 3378 if (!UseThreadPriorities) { 3379 *priority_ptr = NormalPriority; 3380 return OS_OK; 3381 } 3382 int status = thr_getprio(thread->osthread()->thread_id(), &p); 3383 if (status != 0) { 3384 return OS_ERR; 3385 } 3386 *priority_ptr = p; 3387 return OS_OK; 3388 } 3389 3390 //////////////////////////////////////////////////////////////////////////////// 3391 // suspend/resume support 3392 3393 // The low-level signal-based suspend/resume support is a remnant from the 3394 // old VM-suspension that used to be for java-suspension, safepoints etc, 3395 // within hotspot. Currently used by JFR's OSThreadSampler 3396 // 3397 // The remaining code is greatly simplified from the more general suspension 3398 // code that used to be used. 3399 // 3400 // The protocol is quite simple: 3401 // - suspend: 3402 // - sends a signal to the target thread 3403 // - polls the suspend state of the osthread using a yield loop 3404 // - target thread signal handler (SR_handler) sets suspend state 3405 // and blocks in sigsuspend until continued 3406 // - resume: 3407 // - sets target osthread state to continue 3408 // - sends signal to end the sigsuspend loop in the SR_handler 3409 // 3410 // Note that the SR_lock plays no role in this suspend/resume protocol, 3411 // but is checked for NULL in SR_handler as a thread termination indicator. 3412 // The SR_lock is, however, used by JavaThread::java_suspend()/java_resume() APIs. 3413 // 3414 // Note that resume_clear_context() and suspend_save_context() are needed 3415 // by SR_handler(), so that fetch_frame_from_ucontext() works, 3416 // which in part is used by: 3417 // - Forte Analyzer: AsyncGetCallTrace() 3418 // - StackBanging: get_frame_at_stack_banging_point() 3419 // - JFR: get_topframe()-->....-->get_valid_uc_in_signal_handler() 3420 3421 static void resume_clear_context(OSThread *osthread) { 3422 osthread->set_ucontext(NULL); 3423 } 3424 3425 static void suspend_save_context(OSThread *osthread, ucontext_t* context) { 3426 osthread->set_ucontext(context); 3427 } 3428 3429 static PosixSemaphore sr_semaphore; 3430 3431 void os::Solaris::SR_handler(Thread* thread, ucontext_t* context) { 3432 // Save and restore errno to avoid confusing native code with EINTR 3433 // after sigsuspend. 3434 int old_errno = errno; 3435 3436 OSThread* osthread = thread->osthread(); 3437 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); 3438 3439 os::SuspendResume::State current = osthread->sr.state(); 3440 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { 3441 suspend_save_context(osthread, context); 3442 3443 // attempt to switch the state, we assume we had a SUSPEND_REQUEST 3444 os::SuspendResume::State state = osthread->sr.suspended(); 3445 if (state == os::SuspendResume::SR_SUSPENDED) { 3446 sigset_t suspend_set; // signals for sigsuspend() 3447 3448 // get current set of blocked signals and unblock resume signal 3449 pthread_sigmask(SIG_BLOCK, NULL, &suspend_set); 3450 sigdelset(&suspend_set, ASYNC_SIGNAL); 3451 3452 sr_semaphore.signal(); 3453 // wait here until we are resumed 3454 while (1) { 3455 sigsuspend(&suspend_set); 3456 3457 os::SuspendResume::State result = osthread->sr.running(); 3458 if (result == os::SuspendResume::SR_RUNNING) { 3459 sr_semaphore.signal(); 3460 break; 3461 } 3462 } 3463 3464 } else if (state == os::SuspendResume::SR_RUNNING) { 3465 // request was cancelled, continue 3466 } else { 3467 ShouldNotReachHere(); 3468 } 3469 3470 resume_clear_context(osthread); 3471 } else if (current == os::SuspendResume::SR_RUNNING) { 3472 // request was cancelled, continue 3473 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { 3474 // ignore 3475 } else { 3476 // ignore 3477 } 3478 3479 errno = old_errno; 3480 } 3481 3482 void os::print_statistics() { 3483 } 3484 3485 bool os::message_box(const char* title, const char* message) { 3486 int i; 3487 fdStream err(defaultStream::error_fd()); 3488 for (i = 0; i < 78; i++) err.print_raw("="); 3489 err.cr(); 3490 err.print_raw_cr(title); 3491 for (i = 0; i < 78; i++) err.print_raw("-"); 3492 err.cr(); 3493 err.print_raw_cr(message); 3494 for (i = 0; i < 78; i++) err.print_raw("="); 3495 err.cr(); 3496 3497 char buf[16]; 3498 // Prevent process from exiting upon "read error" without consuming all CPU 3499 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 3500 3501 return buf[0] == 'y' || buf[0] == 'Y'; 3502 } 3503 3504 static int sr_notify(OSThread* osthread) { 3505 int status = thr_kill(osthread->thread_id(), ASYNC_SIGNAL); 3506 assert_status(status == 0, status, "thr_kill"); 3507 return status; 3508 } 3509 3510 // "Randomly" selected value for how long we want to spin 3511 // before bailing out on suspending a thread, also how often 3512 // we send a signal to a thread we want to resume 3513 static const int RANDOMLY_LARGE_INTEGER = 1000000; 3514 static const int RANDOMLY_LARGE_INTEGER2 = 100; 3515 3516 static bool do_suspend(OSThread* osthread) { 3517 assert(osthread->sr.is_running(), "thread should be running"); 3518 assert(!sr_semaphore.trywait(), "semaphore has invalid state"); 3519 3520 // mark as suspended and send signal 3521 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { 3522 // failed to switch, state wasn't running? 3523 ShouldNotReachHere(); 3524 return false; 3525 } 3526 3527 if (sr_notify(osthread) != 0) { 3528 ShouldNotReachHere(); 3529 } 3530 3531 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED 3532 while (true) { 3533 if (sr_semaphore.timedwait(create_semaphore_timespec(0, 2000 * NANOSECS_PER_MILLISEC))) { 3534 break; 3535 } else { 3536 // timeout 3537 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); 3538 if (cancelled == os::SuspendResume::SR_RUNNING) { 3539 return false; 3540 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { 3541 // make sure that we consume the signal on the semaphore as well 3542 sr_semaphore.wait(); 3543 break; 3544 } else { 3545 ShouldNotReachHere(); 3546 return false; 3547 } 3548 } 3549 } 3550 3551 guarantee(osthread->sr.is_suspended(), "Must be suspended"); 3552 return true; 3553 } 3554 3555 static void do_resume(OSThread* osthread) { 3556 assert(osthread->sr.is_suspended(), "thread should be suspended"); 3557 assert(!sr_semaphore.trywait(), "invalid semaphore state"); 3558 3559 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { 3560 // failed to switch to WAKEUP_REQUEST 3561 ShouldNotReachHere(); 3562 return; 3563 } 3564 3565 while (true) { 3566 if (sr_notify(osthread) == 0) { 3567 if (sr_semaphore.timedwait(create_semaphore_timespec(0, 2 * NANOSECS_PER_MILLISEC))) { 3568 if (osthread->sr.is_running()) { 3569 return; 3570 } 3571 } 3572 } else { 3573 ShouldNotReachHere(); 3574 } 3575 } 3576 3577 guarantee(osthread->sr.is_running(), "Must be running!"); 3578 } 3579 3580 void os::SuspendedThreadTask::internal_do_task() { 3581 if (do_suspend(_thread->osthread())) { 3582 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); 3583 do_task(context); 3584 do_resume(_thread->osthread()); 3585 } 3586 } 3587 3588 // This does not do anything on Solaris. This is basically a hook for being 3589 // able to use structured exception handling (thread-local exception filters) on, e.g., Win32. 3590 void os::os_exception_wrapper(java_call_t f, JavaValue* value, 3591 const methodHandle& method, JavaCallArguments* args, 3592 Thread* thread) { 3593 f(value, method, args, thread); 3594 } 3595 3596 // This routine may be used by user applications as a "hook" to catch signals. 3597 // The user-defined signal handler must pass unrecognized signals to this 3598 // routine, and if it returns true (non-zero), then the signal handler must 3599 // return immediately. If the flag "abort_if_unrecognized" is true, then this 3600 // routine will never retun false (zero), but instead will execute a VM panic 3601 // routine kill the process. 3602 // 3603 // If this routine returns false, it is OK to call it again. This allows 3604 // the user-defined signal handler to perform checks either before or after 3605 // the VM performs its own checks. Naturally, the user code would be making 3606 // a serious error if it tried to handle an exception (such as a null check 3607 // or breakpoint) that the VM was generating for its own correct operation. 3608 // 3609 // This routine may recognize any of the following kinds of signals: 3610 // SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ, 3611 // ASYNC_SIGNAL. 3612 // It should be consulted by handlers for any of those signals. 3613 // 3614 // The caller of this routine must pass in the three arguments supplied 3615 // to the function referred to in the "sa_sigaction" (not the "sa_handler") 3616 // field of the structure passed to sigaction(). This routine assumes that 3617 // the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 3618 // 3619 // Note that the VM will print warnings if it detects conflicting signal 3620 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 3621 // 3622 extern "C" JNIEXPORT int JVM_handle_solaris_signal(int signo, 3623 siginfo_t* siginfo, 3624 void* ucontext, 3625 int abort_if_unrecognized); 3626 3627 3628 void signalHandler(int sig, siginfo_t* info, void* ucVoid) { 3629 int orig_errno = errno; // Preserve errno value over signal handler. 3630 JVM_handle_solaris_signal(sig, info, ucVoid, true); 3631 errno = orig_errno; 3632 } 3633 3634 // This boolean allows users to forward their own non-matching signals 3635 // to JVM_handle_solaris_signal, harmlessly. 3636 bool os::Solaris::signal_handlers_are_installed = false; 3637 3638 // For signal-chaining 3639 bool os::Solaris::libjsig_is_loaded = false; 3640 typedef struct sigaction *(*get_signal_t)(int); 3641 get_signal_t os::Solaris::get_signal_action = NULL; 3642 3643 struct sigaction* os::Solaris::get_chained_signal_action(int sig) { 3644 struct sigaction *actp = NULL; 3645 3646 if ((libjsig_is_loaded) && (sig <= Maxsignum)) { 3647 // Retrieve the old signal handler from libjsig 3648 actp = (*get_signal_action)(sig); 3649 } 3650 if (actp == NULL) { 3651 // Retrieve the preinstalled signal handler from jvm 3652 actp = get_preinstalled_handler(sig); 3653 } 3654 3655 return actp; 3656 } 3657 3658 static bool call_chained_handler(struct sigaction *actp, int sig, 3659 siginfo_t *siginfo, void *context) { 3660 // Call the old signal handler 3661 if (actp->sa_handler == SIG_DFL) { 3662 // It's more reasonable to let jvm treat it as an unexpected exception 3663 // instead of taking the default action. 3664 return false; 3665 } else if (actp->sa_handler != SIG_IGN) { 3666 if ((actp->sa_flags & SA_NODEFER) == 0) { 3667 // automaticlly block the signal 3668 sigaddset(&(actp->sa_mask), sig); 3669 } 3670 3671 sa_handler_t hand; 3672 sa_sigaction_t sa; 3673 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 3674 // retrieve the chained handler 3675 if (siginfo_flag_set) { 3676 sa = actp->sa_sigaction; 3677 } else { 3678 hand = actp->sa_handler; 3679 } 3680 3681 if ((actp->sa_flags & SA_RESETHAND) != 0) { 3682 actp->sa_handler = SIG_DFL; 3683 } 3684 3685 // try to honor the signal mask 3686 sigset_t oset; 3687 pthread_sigmask(SIG_SETMASK, &(actp->sa_mask), &oset); 3688 3689 // call into the chained handler 3690 if (siginfo_flag_set) { 3691 (*sa)(sig, siginfo, context); 3692 } else { 3693 (*hand)(sig); 3694 } 3695 3696 // restore the signal mask 3697 pthread_sigmask(SIG_SETMASK, &oset, 0); 3698 } 3699 // Tell jvm's signal handler the signal is taken care of. 3700 return true; 3701 } 3702 3703 bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) { 3704 bool chained = false; 3705 // signal-chaining 3706 if (UseSignalChaining) { 3707 struct sigaction *actp = get_chained_signal_action(sig); 3708 if (actp != NULL) { 3709 chained = call_chained_handler(actp, sig, siginfo, context); 3710 } 3711 } 3712 return chained; 3713 } 3714 3715 struct sigaction* os::Solaris::get_preinstalled_handler(int sig) { 3716 assert((chainedsigactions != (struct sigaction *)NULL) && 3717 (preinstalled_sigs != (int *)NULL), "signals not yet initialized"); 3718 if (preinstalled_sigs[sig] != 0) { 3719 return &chainedsigactions[sig]; 3720 } 3721 return NULL; 3722 } 3723 3724 void os::Solaris::save_preinstalled_handler(int sig, 3725 struct sigaction& oldAct) { 3726 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range"); 3727 assert((chainedsigactions != (struct sigaction *)NULL) && 3728 (preinstalled_sigs != (int *)NULL), "signals not yet initialized"); 3729 chainedsigactions[sig] = oldAct; 3730 preinstalled_sigs[sig] = 1; 3731 } 3732 3733 void os::Solaris::set_signal_handler(int sig, bool set_installed, 3734 bool oktochain) { 3735 // Check for overwrite. 3736 struct sigaction oldAct; 3737 sigaction(sig, (struct sigaction*)NULL, &oldAct); 3738 void* oldhand = 3739 oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3740 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3741 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 3742 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 3743 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) { 3744 if (AllowUserSignalHandlers || !set_installed) { 3745 // Do not overwrite; user takes responsibility to forward to us. 3746 return; 3747 } else if (UseSignalChaining) { 3748 if (oktochain) { 3749 // save the old handler in jvm 3750 save_preinstalled_handler(sig, oldAct); 3751 } else { 3752 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal."); 3753 } 3754 // libjsig also interposes the sigaction() call below and saves the 3755 // old sigaction on it own. 3756 } else { 3757 fatal("Encountered unexpected pre-existing sigaction handler " 3758 "%#lx for signal %d.", (long)oldhand, sig); 3759 } 3760 } 3761 3762 struct sigaction sigAct; 3763 sigfillset(&(sigAct.sa_mask)); 3764 sigAct.sa_handler = SIG_DFL; 3765 3766 sigAct.sa_sigaction = signalHandler; 3767 // Handle SIGSEGV on alternate signal stack if 3768 // not using stack banging 3769 if (!UseStackBanging && sig == SIGSEGV) { 3770 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK; 3771 } else { 3772 sigAct.sa_flags = SA_SIGINFO | SA_RESTART; 3773 } 3774 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags); 3775 3776 sigaction(sig, &sigAct, &oldAct); 3777 3778 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3779 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3780 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 3781 } 3782 3783 3784 #define DO_SIGNAL_CHECK(sig) \ 3785 do { \ 3786 if (!sigismember(&check_signal_done, sig)) { \ 3787 os::Solaris::check_signal_handler(sig); \ 3788 } \ 3789 } while (0) 3790 3791 // This method is a periodic task to check for misbehaving JNI applications 3792 // under CheckJNI, we can add any periodic checks here 3793 3794 void os::run_periodic_checks() { 3795 // A big source of grief is hijacking virt. addr 0x0 on Solaris, 3796 // thereby preventing a NULL checks. 3797 if (!check_addr0_done) check_addr0_done = check_addr0(tty); 3798 3799 if (check_signals == false) return; 3800 3801 // SEGV and BUS if overridden could potentially prevent 3802 // generation of hs*.log in the event of a crash, debugging 3803 // such a case can be very challenging, so we absolutely 3804 // check for the following for a good measure: 3805 DO_SIGNAL_CHECK(SIGSEGV); 3806 DO_SIGNAL_CHECK(SIGILL); 3807 DO_SIGNAL_CHECK(SIGFPE); 3808 DO_SIGNAL_CHECK(SIGBUS); 3809 DO_SIGNAL_CHECK(SIGPIPE); 3810 DO_SIGNAL_CHECK(SIGXFSZ); 3811 DO_SIGNAL_CHECK(ASYNC_SIGNAL); 3812 3813 // ReduceSignalUsage allows the user to override these handlers 3814 // see comments at the very top and jvm_solaris.h 3815 if (!ReduceSignalUsage) { 3816 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 3817 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 3818 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 3819 DO_SIGNAL_CHECK(BREAK_SIGNAL); 3820 } 3821 } 3822 3823 typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 3824 3825 static os_sigaction_t os_sigaction = NULL; 3826 3827 void os::Solaris::check_signal_handler(int sig) { 3828 char buf[O_BUFLEN]; 3829 address jvmHandler = NULL; 3830 3831 struct sigaction act; 3832 if (os_sigaction == NULL) { 3833 // only trust the default sigaction, in case it has been interposed 3834 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); 3835 if (os_sigaction == NULL) return; 3836 } 3837 3838 os_sigaction(sig, (struct sigaction*)NULL, &act); 3839 3840 address thisHandler = (act.sa_flags & SA_SIGINFO) 3841 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 3842 : CAST_FROM_FN_PTR(address, act.sa_handler); 3843 3844 3845 switch (sig) { 3846 case SIGSEGV: 3847 case SIGBUS: 3848 case SIGFPE: 3849 case SIGPIPE: 3850 case SIGXFSZ: 3851 case SIGILL: 3852 case ASYNC_SIGNAL: 3853 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler); 3854 break; 3855 3856 case SHUTDOWN1_SIGNAL: 3857 case SHUTDOWN2_SIGNAL: 3858 case SHUTDOWN3_SIGNAL: 3859 case BREAK_SIGNAL: 3860 jvmHandler = (address)user_handler(); 3861 break; 3862 3863 default: 3864 return; 3865 } 3866 3867 if (thisHandler != jvmHandler) { 3868 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 3869 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 3870 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 3871 // No need to check this sig any longer 3872 sigaddset(&check_signal_done, sig); 3873 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN 3874 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) { 3875 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell", 3876 exception_name(sig, buf, O_BUFLEN)); 3877 } 3878 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) { 3879 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 3880 tty->print("expected:"); 3881 os::Posix::print_sa_flags(tty, os::Solaris::get_our_sigflags(sig)); 3882 tty->cr(); 3883 tty->print(" found:"); 3884 os::Posix::print_sa_flags(tty, act.sa_flags); 3885 tty->cr(); 3886 // No need to check this sig any longer 3887 sigaddset(&check_signal_done, sig); 3888 } 3889 3890 // Print all the signal handler state 3891 if (sigismember(&check_signal_done, sig)) { 3892 print_signal_handlers(tty, buf, O_BUFLEN); 3893 } 3894 3895 } 3896 3897 void os::Solaris::install_signal_handlers() { 3898 signal_handlers_are_installed = true; 3899 3900 // signal-chaining 3901 typedef void (*signal_setting_t)(); 3902 signal_setting_t begin_signal_setting = NULL; 3903 signal_setting_t end_signal_setting = NULL; 3904 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3905 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 3906 if (begin_signal_setting != NULL) { 3907 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 3908 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 3909 get_signal_action = CAST_TO_FN_PTR(get_signal_t, 3910 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 3911 libjsig_is_loaded = true; 3912 assert(UseSignalChaining, "should enable signal-chaining"); 3913 } 3914 if (libjsig_is_loaded) { 3915 // Tell libjsig jvm is setting signal handlers 3916 (*begin_signal_setting)(); 3917 } 3918 3919 set_signal_handler(SIGSEGV, true, true); 3920 set_signal_handler(SIGPIPE, true, true); 3921 set_signal_handler(SIGXFSZ, true, true); 3922 set_signal_handler(SIGBUS, true, true); 3923 set_signal_handler(SIGILL, true, true); 3924 set_signal_handler(SIGFPE, true, true); 3925 set_signal_handler(ASYNC_SIGNAL, true, true); 3926 3927 if (libjsig_is_loaded) { 3928 // Tell libjsig jvm finishes setting signal handlers 3929 (*end_signal_setting)(); 3930 } 3931 3932 // We don't activate signal checker if libjsig is in place, we trust ourselves 3933 // and if UserSignalHandler is installed all bets are off. 3934 // Log that signal checking is off only if -verbose:jni is specified. 3935 if (CheckJNICalls) { 3936 if (libjsig_is_loaded) { 3937 if (PrintJNIResolving) { 3938 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); 3939 } 3940 check_signals = false; 3941 } 3942 if (AllowUserSignalHandlers) { 3943 if (PrintJNIResolving) { 3944 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 3945 } 3946 check_signals = false; 3947 } 3948 } 3949 } 3950 3951 3952 void report_error(const char* file_name, int line_no, const char* title, 3953 const char* format, ...); 3954 3955 // (Static) wrappers for the liblgrp API 3956 os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home; 3957 os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init; 3958 os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini; 3959 os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root; 3960 os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children; 3961 os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources; 3962 os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps; 3963 os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale; 3964 os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0; 3965 3966 static address resolve_symbol_lazy(const char* name) { 3967 address addr = (address) dlsym(RTLD_DEFAULT, name); 3968 if (addr == NULL) { 3969 // RTLD_DEFAULT was not defined on some early versions of 2.5.1 3970 addr = (address) dlsym(RTLD_NEXT, name); 3971 } 3972 return addr; 3973 } 3974 3975 static address resolve_symbol(const char* name) { 3976 address addr = resolve_symbol_lazy(name); 3977 if (addr == NULL) { 3978 fatal(dlerror()); 3979 } 3980 return addr; 3981 } 3982 3983 void os::Solaris::libthread_init() { 3984 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators"); 3985 3986 lwp_priocntl_init(); 3987 3988 // RTLD_DEFAULT was not defined on some early versions of 5.5.1 3989 if (func == NULL) { 3990 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators"); 3991 // Guarantee that this VM is running on an new enough OS (5.6 or 3992 // later) that it will have a new enough libthread.so. 3993 guarantee(func != NULL, "libthread.so is too old."); 3994 } 3995 3996 int size; 3997 void (*handler_info_func)(address *, int *); 3998 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo")); 3999 handler_info_func(&handler_start, &size); 4000 handler_end = handler_start + size; 4001 } 4002 4003 4004 int_fnP_mutex_tP os::Solaris::_mutex_lock; 4005 int_fnP_mutex_tP os::Solaris::_mutex_trylock; 4006 int_fnP_mutex_tP os::Solaris::_mutex_unlock; 4007 int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init; 4008 int_fnP_mutex_tP os::Solaris::_mutex_destroy; 4009 int os::Solaris::_mutex_scope = USYNC_THREAD; 4010 4011 int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait; 4012 int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait; 4013 int_fnP_cond_tP os::Solaris::_cond_signal; 4014 int_fnP_cond_tP os::Solaris::_cond_broadcast; 4015 int_fnP_cond_tP_i_vP os::Solaris::_cond_init; 4016 int_fnP_cond_tP os::Solaris::_cond_destroy; 4017 int os::Solaris::_cond_scope = USYNC_THREAD; 4018 bool os::Solaris::_synchronization_initialized; 4019 4020 void os::Solaris::synchronization_init() { 4021 if (UseLWPSynchronization) { 4022 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock"))); 4023 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock"))); 4024 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock"))); 4025 os::Solaris::set_mutex_init(lwp_mutex_init); 4026 os::Solaris::set_mutex_destroy(lwp_mutex_destroy); 4027 os::Solaris::set_mutex_scope(USYNC_THREAD); 4028 4029 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait"))); 4030 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait"))); 4031 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal"))); 4032 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast"))); 4033 os::Solaris::set_cond_init(lwp_cond_init); 4034 os::Solaris::set_cond_destroy(lwp_cond_destroy); 4035 os::Solaris::set_cond_scope(USYNC_THREAD); 4036 } else { 4037 os::Solaris::set_mutex_scope(USYNC_THREAD); 4038 os::Solaris::set_cond_scope(USYNC_THREAD); 4039 4040 if (UsePthreads) { 4041 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock"))); 4042 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock"))); 4043 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock"))); 4044 os::Solaris::set_mutex_init(pthread_mutex_default_init); 4045 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy"))); 4046 4047 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait"))); 4048 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait"))); 4049 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal"))); 4050 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast"))); 4051 os::Solaris::set_cond_init(pthread_cond_default_init); 4052 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy"))); 4053 } else { 4054 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock"))); 4055 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock"))); 4056 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock"))); 4057 os::Solaris::set_mutex_init(::mutex_init); 4058 os::Solaris::set_mutex_destroy(::mutex_destroy); 4059 4060 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait"))); 4061 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait"))); 4062 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal"))); 4063 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast"))); 4064 os::Solaris::set_cond_init(::cond_init); 4065 os::Solaris::set_cond_destroy(::cond_destroy); 4066 } 4067 } 4068 _synchronization_initialized = true; 4069 } 4070 4071 bool os::Solaris::liblgrp_init() { 4072 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY); 4073 if (handle != NULL) { 4074 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home"))); 4075 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init"))); 4076 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini"))); 4077 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root"))); 4078 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children"))); 4079 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources"))); 4080 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps"))); 4081 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t, 4082 dlsym(handle, "lgrp_cookie_stale"))); 4083 4084 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER); 4085 set_lgrp_cookie(c); 4086 return true; 4087 } 4088 return false; 4089 } 4090 4091 // int pset_getloadavg(psetid_t pset, double loadavg[], int nelem); 4092 typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem); 4093 static pset_getloadavg_type pset_getloadavg_ptr = NULL; 4094 4095 void init_pset_getloadavg_ptr(void) { 4096 pset_getloadavg_ptr = 4097 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg"); 4098 if (pset_getloadavg_ptr == NULL) { 4099 log_warning(os)("pset_getloadavg function not found"); 4100 } 4101 } 4102 4103 int os::Solaris::_dev_zero_fd = -1; 4104 4105 // this is called _before_ the global arguments have been parsed 4106 void os::init(void) { 4107 _initial_pid = getpid(); 4108 4109 max_hrtime = first_hrtime = gethrtime(); 4110 4111 init_random(1234567); 4112 4113 page_size = sysconf(_SC_PAGESIZE); 4114 if (page_size == -1) { 4115 fatal("os_solaris.cpp: os::init: sysconf failed (%s)", os::strerror(errno)); 4116 } 4117 init_page_sizes((size_t) page_size); 4118 4119 Solaris::initialize_system_info(); 4120 4121 int fd = ::open("/dev/zero", O_RDWR); 4122 if (fd < 0) { 4123 fatal("os::init: cannot open /dev/zero (%s)", os::strerror(errno)); 4124 } else { 4125 Solaris::set_dev_zero_fd(fd); 4126 4127 // Close on exec, child won't inherit. 4128 fcntl(fd, F_SETFD, FD_CLOEXEC); 4129 } 4130 4131 clock_tics_per_sec = CLK_TCK; 4132 4133 // check if dladdr1() exists; dladdr1 can provide more information than 4134 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9 4135 // and is available on linker patches for 5.7 and 5.8. 4136 // libdl.so must have been loaded, this call is just an entry lookup 4137 void * hdl = dlopen("libdl.so", RTLD_NOW); 4138 if (hdl) { 4139 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1")); 4140 } 4141 4142 // main_thread points to the thread that created/loaded the JVM. 4143 main_thread = thr_self(); 4144 4145 // dynamic lookup of functions that may not be available in our lowest 4146 // supported Solaris release 4147 void * handle = dlopen("libc.so.1", RTLD_LAZY); 4148 if (handle != NULL) { 4149 Solaris::_pthread_setname_np = // from 11.3 4150 (Solaris::pthread_setname_np_func_t)dlsym(handle, "pthread_setname_np"); 4151 } 4152 } 4153 4154 // To install functions for atexit system call 4155 extern "C" { 4156 static void perfMemory_exit_helper() { 4157 perfMemory_exit(); 4158 } 4159 } 4160 4161 // this is called _after_ the global arguments have been parsed 4162 jint os::init_2(void) { 4163 // try to enable extended file IO ASAP, see 6431278 4164 os::Solaris::try_enable_extended_io(); 4165 4166 // Check and sets minimum stack sizes against command line options 4167 if (Posix::set_minimum_stack_sizes() == JNI_ERR) { 4168 return JNI_ERR; 4169 } 4170 4171 Solaris::libthread_init(); 4172 4173 if (UseNUMA) { 4174 if (!Solaris::liblgrp_init()) { 4175 UseNUMA = false; 4176 } else { 4177 size_t lgrp_limit = os::numa_get_groups_num(); 4178 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtInternal); 4179 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit); 4180 FREE_C_HEAP_ARRAY(int, lgrp_ids); 4181 if (lgrp_num < 2) { 4182 // There's only one locality group, disable NUMA. 4183 UseNUMA = false; 4184 } 4185 } 4186 if (!UseNUMA && ForceNUMA) { 4187 UseNUMA = true; 4188 } 4189 } 4190 4191 Solaris::signal_sets_init(); 4192 Solaris::init_signal_mem(); 4193 Solaris::install_signal_handlers(); 4194 // Initialize data for jdk.internal.misc.Signal 4195 if (!ReduceSignalUsage) { 4196 jdk_misc_signal_init(); 4197 } 4198 4199 // initialize synchronization primitives to use either thread or 4200 // lwp synchronization (controlled by UseLWPSynchronization) 4201 Solaris::synchronization_init(); 4202 DEBUG_ONLY(os::set_mutex_init_done();) 4203 4204 if (MaxFDLimit) { 4205 // set the number of file descriptors to max. print out error 4206 // if getrlimit/setrlimit fails but continue regardless. 4207 struct rlimit nbr_files; 4208 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 4209 if (status != 0) { 4210 log_info(os)("os::init_2 getrlimit failed: %s", os::strerror(errno)); 4211 } else { 4212 nbr_files.rlim_cur = nbr_files.rlim_max; 4213 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 4214 if (status != 0) { 4215 log_info(os)("os::init_2 setrlimit failed: %s", os::strerror(errno)); 4216 } 4217 } 4218 } 4219 4220 // Calculate theoretical max. size of Threads to guard gainst 4221 // artifical out-of-memory situations, where all available address- 4222 // space has been reserved by thread stacks. Default stack size is 1Mb. 4223 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ? 4224 JavaThread::stack_size_at_create() : (1*K*K); 4225 assert(pre_thread_stack_size != 0, "Must have a stack"); 4226 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when 4227 // we should start doing Virtual Memory banging. Currently when the threads will 4228 // have used all but 200Mb of space. 4229 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K); 4230 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size; 4231 4232 // at-exit methods are called in the reverse order of their registration. 4233 // In Solaris 7 and earlier, atexit functions are called on return from 4234 // main or as a result of a call to exit(3C). There can be only 32 of 4235 // these functions registered and atexit() does not set errno. In Solaris 4236 // 8 and later, there is no limit to the number of functions registered 4237 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit 4238 // functions are called upon dlclose(3DL) in addition to return from main 4239 // and exit(3C). 4240 4241 if (PerfAllowAtExitRegistration) { 4242 // only register atexit functions if PerfAllowAtExitRegistration is set. 4243 // atexit functions can be delayed until process exit time, which 4244 // can be problematic for embedded VM situations. Embedded VMs should 4245 // call DestroyJavaVM() to assure that VM resources are released. 4246 4247 // note: perfMemory_exit_helper atexit function may be removed in 4248 // the future if the appropriate cleanup code can be added to the 4249 // VM_Exit VMOperation's doit method. 4250 if (atexit(perfMemory_exit_helper) != 0) { 4251 warning("os::init2 atexit(perfMemory_exit_helper) failed"); 4252 } 4253 } 4254 4255 // Init pset_loadavg function pointer 4256 init_pset_getloadavg_ptr(); 4257 4258 return JNI_OK; 4259 } 4260 4261 // Mark the polling page as unreadable 4262 void os::make_polling_page_unreadable(void) { 4263 if (mprotect((char *)_polling_page, page_size, PROT_NONE) != 0) { 4264 fatal("Could not disable polling page"); 4265 } 4266 } 4267 4268 // Mark the polling page as readable 4269 void os::make_polling_page_readable(void) { 4270 if (mprotect((char *)_polling_page, page_size, PROT_READ) != 0) { 4271 fatal("Could not enable polling page"); 4272 } 4273 } 4274 4275 // Is a (classpath) directory empty? 4276 bool os::dir_is_empty(const char* path) { 4277 DIR *dir = NULL; 4278 struct dirent *ptr; 4279 4280 dir = opendir(path); 4281 if (dir == NULL) return true; 4282 4283 // Scan the directory 4284 bool result = true; 4285 while (result && (ptr = readdir(dir)) != NULL) { 4286 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 4287 result = false; 4288 } 4289 } 4290 closedir(dir); 4291 return result; 4292 } 4293 4294 // This code originates from JDK's sysOpen and open64_w 4295 // from src/solaris/hpi/src/system_md.c 4296 4297 int os::open(const char *path, int oflag, int mode) { 4298 if (strlen(path) > MAX_PATH - 1) { 4299 errno = ENAMETOOLONG; 4300 return -1; 4301 } 4302 int fd; 4303 4304 fd = ::open64(path, oflag, mode); 4305 if (fd == -1) return -1; 4306 4307 // If the open succeeded, the file might still be a directory 4308 { 4309 struct stat64 buf64; 4310 int ret = ::fstat64(fd, &buf64); 4311 int st_mode = buf64.st_mode; 4312 4313 if (ret != -1) { 4314 if ((st_mode & S_IFMT) == S_IFDIR) { 4315 errno = EISDIR; 4316 ::close(fd); 4317 return -1; 4318 } 4319 } else { 4320 ::close(fd); 4321 return -1; 4322 } 4323 } 4324 4325 // 32-bit Solaris systems suffer from: 4326 // 4327 // - an historical default soft limit of 256 per-process file 4328 // descriptors that is too low for many Java programs. 4329 // 4330 // - a design flaw where file descriptors created using stdio 4331 // fopen must be less than 256, _even_ when the first limit above 4332 // has been raised. This can cause calls to fopen (but not calls to 4333 // open, for example) to fail mysteriously, perhaps in 3rd party 4334 // native code (although the JDK itself uses fopen). One can hardly 4335 // criticize them for using this most standard of all functions. 4336 // 4337 // We attempt to make everything work anyways by: 4338 // 4339 // - raising the soft limit on per-process file descriptors beyond 4340 // 256 4341 // 4342 // - As of Solaris 10u4, we can request that Solaris raise the 256 4343 // stdio fopen limit by calling function enable_extended_FILE_stdio. 4344 // This is done in init_2 and recorded in enabled_extended_FILE_stdio 4345 // 4346 // - If we are stuck on an old (pre 10u4) Solaris system, we can 4347 // workaround the bug by remapping non-stdio file descriptors below 4348 // 256 to ones beyond 256, which is done below. 4349 // 4350 // See: 4351 // 1085341: 32-bit stdio routines should support file descriptors >255 4352 // 6533291: Work around 32-bit Solaris stdio limit of 256 open files 4353 // 6431278: Netbeans crash on 32 bit Solaris: need to call 4354 // enable_extended_FILE_stdio() in VM initialisation 4355 // Giri Mandalika's blog 4356 // http://technopark02.blogspot.com/2005_05_01_archive.html 4357 // 4358 #ifndef _LP64 4359 if ((!enabled_extended_FILE_stdio) && fd < 256) { 4360 int newfd = ::fcntl(fd, F_DUPFD, 256); 4361 if (newfd != -1) { 4362 ::close(fd); 4363 fd = newfd; 4364 } 4365 } 4366 #endif // 32-bit Solaris 4367 4368 // All file descriptors that are opened in the JVM and not 4369 // specifically destined for a subprocess should have the 4370 // close-on-exec flag set. If we don't set it, then careless 3rd 4371 // party native code might fork and exec without closing all 4372 // appropriate file descriptors (e.g. as we do in closeDescriptors in 4373 // UNIXProcess.c), and this in turn might: 4374 // 4375 // - cause end-of-file to fail to be detected on some file 4376 // descriptors, resulting in mysterious hangs, or 4377 // 4378 // - might cause an fopen in the subprocess to fail on a system 4379 // suffering from bug 1085341. 4380 // 4381 // (Yes, the default setting of the close-on-exec flag is a Unix 4382 // design flaw) 4383 // 4384 // See: 4385 // 1085341: 32-bit stdio routines should support file descriptors >255 4386 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed 4387 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 4388 // 4389 #ifdef FD_CLOEXEC 4390 { 4391 int flags = ::fcntl(fd, F_GETFD); 4392 if (flags != -1) { 4393 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); 4394 } 4395 } 4396 #endif 4397 4398 return fd; 4399 } 4400 4401 // create binary file, rewriting existing file if required 4402 int os::create_binary_file(const char* path, bool rewrite_existing) { 4403 int oflags = O_WRONLY | O_CREAT; 4404 if (!rewrite_existing) { 4405 oflags |= O_EXCL; 4406 } 4407 return ::open64(path, oflags, S_IREAD | S_IWRITE); 4408 } 4409 4410 // return current position of file pointer 4411 jlong os::current_file_offset(int fd) { 4412 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR); 4413 } 4414 4415 // move file pointer to the specified offset 4416 jlong os::seek_to_file_offset(int fd, jlong offset) { 4417 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET); 4418 } 4419 4420 jlong os::lseek(int fd, jlong offset, int whence) { 4421 return (jlong) ::lseek64(fd, offset, whence); 4422 } 4423 4424 int os::ftruncate(int fd, jlong length) { 4425 return ::ftruncate64(fd, length); 4426 } 4427 4428 int os::fsync(int fd) { 4429 RESTARTABLE_RETURN_INT(::fsync(fd)); 4430 } 4431 4432 int os::available(int fd, jlong *bytes) { 4433 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 4434 "Assumed _thread_in_native"); 4435 jlong cur, end; 4436 int mode; 4437 struct stat64 buf64; 4438 4439 if (::fstat64(fd, &buf64) >= 0) { 4440 mode = buf64.st_mode; 4441 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 4442 int n,ioctl_return; 4443 4444 RESTARTABLE(::ioctl(fd, FIONREAD, &n), ioctl_return); 4445 if (ioctl_return>= 0) { 4446 *bytes = n; 4447 return 1; 4448 } 4449 } 4450 } 4451 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) { 4452 return 0; 4453 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) { 4454 return 0; 4455 } else if (::lseek64(fd, cur, SEEK_SET) == -1) { 4456 return 0; 4457 } 4458 *bytes = end - cur; 4459 return 1; 4460 } 4461 4462 // Map a block of memory. 4463 char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 4464 char *addr, size_t bytes, bool read_only, 4465 bool allow_exec) { 4466 int prot; 4467 int flags; 4468 4469 if (read_only) { 4470 prot = PROT_READ; 4471 flags = MAP_SHARED; 4472 } else { 4473 prot = PROT_READ | PROT_WRITE; 4474 flags = MAP_PRIVATE; 4475 } 4476 4477 if (allow_exec) { 4478 prot |= PROT_EXEC; 4479 } 4480 4481 if (addr != NULL) { 4482 flags |= MAP_FIXED; 4483 } 4484 4485 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, 4486 fd, file_offset); 4487 if (mapped_address == MAP_FAILED) { 4488 return NULL; 4489 } 4490 return mapped_address; 4491 } 4492 4493 4494 // Remap a block of memory. 4495 char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 4496 char *addr, size_t bytes, bool read_only, 4497 bool allow_exec) { 4498 // same as map_memory() on this OS 4499 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 4500 allow_exec); 4501 } 4502 4503 4504 // Unmap a block of memory. 4505 bool os::pd_unmap_memory(char* addr, size_t bytes) { 4506 return munmap(addr, bytes) == 0; 4507 } 4508 4509 void os::pause() { 4510 char filename[MAX_PATH]; 4511 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 4512 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 4513 } else { 4514 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 4515 } 4516 4517 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 4518 if (fd != -1) { 4519 struct stat buf; 4520 ::close(fd); 4521 while (::stat(filename, &buf) == 0) { 4522 (void)::poll(NULL, 0, 100); 4523 } 4524 } else { 4525 jio_fprintf(stderr, 4526 "Could not open pause file '%s', continuing immediately.\n", filename); 4527 } 4528 } 4529 4530 #ifndef PRODUCT 4531 #ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS 4532 // Turn this on if you need to trace synch operations. 4533 // Set RECORD_SYNCH_LIMIT to a large-enough value, 4534 // and call record_synch_enable and record_synch_disable 4535 // around the computation of interest. 4536 4537 void record_synch(char* name, bool returning); // defined below 4538 4539 class RecordSynch { 4540 char* _name; 4541 public: 4542 RecordSynch(char* name) :_name(name) { record_synch(_name, false); } 4543 ~RecordSynch() { record_synch(_name, true); } 4544 }; 4545 4546 #define CHECK_SYNCH_OP(ret, name, params, args, inner) \ 4547 extern "C" ret name params { \ 4548 typedef ret name##_t params; \ 4549 static name##_t* implem = NULL; \ 4550 static int callcount = 0; \ 4551 if (implem == NULL) { \ 4552 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \ 4553 if (implem == NULL) fatal(dlerror()); \ 4554 } \ 4555 ++callcount; \ 4556 RecordSynch _rs(#name); \ 4557 inner; \ 4558 return implem args; \ 4559 } 4560 // in dbx, examine callcounts this way: 4561 // for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done 4562 4563 #define CHECK_POINTER_OK(p) \ 4564 (!Universe::is_fully_initialized() || !Universe::is_reserved_heap((oop)(p))) 4565 #define CHECK_MU \ 4566 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only."); 4567 #define CHECK_CV \ 4568 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only."); 4569 #define CHECK_P(p) \ 4570 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only."); 4571 4572 #define CHECK_MUTEX(mutex_op) \ 4573 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU); 4574 4575 CHECK_MUTEX( mutex_lock) 4576 CHECK_MUTEX( _mutex_lock) 4577 CHECK_MUTEX( mutex_unlock) 4578 CHECK_MUTEX(_mutex_unlock) 4579 CHECK_MUTEX( mutex_trylock) 4580 CHECK_MUTEX(_mutex_trylock) 4581 4582 #define CHECK_COND(cond_op) \ 4583 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU; CHECK_CV); 4584 4585 CHECK_COND( cond_wait); 4586 CHECK_COND(_cond_wait); 4587 CHECK_COND(_cond_wait_cancel); 4588 4589 #define CHECK_COND2(cond_op) \ 4590 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU; CHECK_CV); 4591 4592 CHECK_COND2( cond_timedwait); 4593 CHECK_COND2(_cond_timedwait); 4594 CHECK_COND2(_cond_timedwait_cancel); 4595 4596 // do the _lwp_* versions too 4597 #define mutex_t lwp_mutex_t 4598 #define cond_t lwp_cond_t 4599 CHECK_MUTEX( _lwp_mutex_lock) 4600 CHECK_MUTEX( _lwp_mutex_unlock) 4601 CHECK_MUTEX( _lwp_mutex_trylock) 4602 CHECK_MUTEX( __lwp_mutex_lock) 4603 CHECK_MUTEX( __lwp_mutex_unlock) 4604 CHECK_MUTEX( __lwp_mutex_trylock) 4605 CHECK_MUTEX(___lwp_mutex_lock) 4606 CHECK_MUTEX(___lwp_mutex_unlock) 4607 4608 CHECK_COND( _lwp_cond_wait); 4609 CHECK_COND( __lwp_cond_wait); 4610 CHECK_COND(___lwp_cond_wait); 4611 4612 CHECK_COND2( _lwp_cond_timedwait); 4613 CHECK_COND2( __lwp_cond_timedwait); 4614 #undef mutex_t 4615 #undef cond_t 4616 4617 CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0); 4618 CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0); 4619 CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0); 4620 CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0); 4621 CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p)); 4622 CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p)); 4623 CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV); 4624 CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV); 4625 4626 4627 // recording machinery: 4628 4629 enum { RECORD_SYNCH_LIMIT = 200 }; 4630 char* record_synch_name[RECORD_SYNCH_LIMIT]; 4631 void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT]; 4632 bool record_synch_returning[RECORD_SYNCH_LIMIT]; 4633 thread_t record_synch_thread[RECORD_SYNCH_LIMIT]; 4634 int record_synch_count = 0; 4635 bool record_synch_enabled = false; 4636 4637 // in dbx, examine recorded data this way: 4638 // for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done 4639 4640 void record_synch(char* name, bool returning) { 4641 if (record_synch_enabled) { 4642 if (record_synch_count < RECORD_SYNCH_LIMIT) { 4643 record_synch_name[record_synch_count] = name; 4644 record_synch_returning[record_synch_count] = returning; 4645 record_synch_thread[record_synch_count] = thr_self(); 4646 record_synch_arg0ptr[record_synch_count] = &name; 4647 record_synch_count++; 4648 } 4649 // put more checking code here: 4650 // ... 4651 } 4652 } 4653 4654 void record_synch_enable() { 4655 // start collecting trace data, if not already doing so 4656 if (!record_synch_enabled) record_synch_count = 0; 4657 record_synch_enabled = true; 4658 } 4659 4660 void record_synch_disable() { 4661 // stop collecting trace data 4662 record_synch_enabled = false; 4663 } 4664 4665 #endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS 4666 #endif // PRODUCT 4667 4668 const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime); 4669 const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) - 4670 (intptr_t)(&((prusage_t *)(NULL))->pr_utime); 4671 4672 4673 // JVMTI & JVM monitoring and management support 4674 // The thread_cpu_time() and current_thread_cpu_time() are only 4675 // supported if is_thread_cpu_time_supported() returns true. 4676 // They are not supported on Solaris T1. 4677 4678 // current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 4679 // are used by JVM M&M and JVMTI to get user+sys or user CPU time 4680 // of a thread. 4681 // 4682 // current_thread_cpu_time() and thread_cpu_time(Thread *) 4683 // returns the fast estimate available on the platform. 4684 4685 // hrtime_t gethrvtime() return value includes 4686 // user time but does not include system time 4687 jlong os::current_thread_cpu_time() { 4688 return (jlong) gethrvtime(); 4689 } 4690 4691 jlong os::thread_cpu_time(Thread *thread) { 4692 // return user level CPU time only to be consistent with 4693 // what current_thread_cpu_time returns. 4694 // thread_cpu_time_info() must be changed if this changes 4695 return os::thread_cpu_time(thread, false /* user time only */); 4696 } 4697 4698 jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 4699 if (user_sys_cpu_time) { 4700 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 4701 } else { 4702 return os::current_thread_cpu_time(); 4703 } 4704 } 4705 4706 jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 4707 char proc_name[64]; 4708 int count; 4709 prusage_t prusage; 4710 jlong lwp_time; 4711 int fd; 4712 4713 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage", 4714 getpid(), 4715 thread->osthread()->lwp_id()); 4716 fd = ::open(proc_name, O_RDONLY); 4717 if (fd == -1) return -1; 4718 4719 do { 4720 count = ::pread(fd, 4721 (void *)&prusage.pr_utime, 4722 thr_time_size, 4723 thr_time_off); 4724 } while (count < 0 && errno == EINTR); 4725 ::close(fd); 4726 if (count < 0) return -1; 4727 4728 if (user_sys_cpu_time) { 4729 // user + system CPU time 4730 lwp_time = (((jlong)prusage.pr_stime.tv_sec + 4731 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) + 4732 (jlong)prusage.pr_stime.tv_nsec + 4733 (jlong)prusage.pr_utime.tv_nsec; 4734 } else { 4735 // user level CPU time only 4736 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) + 4737 (jlong)prusage.pr_utime.tv_nsec; 4738 } 4739 4740 return (lwp_time); 4741 } 4742 4743 void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4744 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 4745 info_ptr->may_skip_backward = false; // elapsed time not wall time 4746 info_ptr->may_skip_forward = false; // elapsed time not wall time 4747 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned 4748 } 4749 4750 void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 4751 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 4752 info_ptr->may_skip_backward = false; // elapsed time not wall time 4753 info_ptr->may_skip_forward = false; // elapsed time not wall time 4754 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned 4755 } 4756 4757 bool os::is_thread_cpu_time_supported() { 4758 return true; 4759 } 4760 4761 // System loadavg support. Returns -1 if load average cannot be obtained. 4762 // Return the load average for our processor set if the primitive exists 4763 // (Solaris 9 and later). Otherwise just return system wide loadavg. 4764 int os::loadavg(double loadavg[], int nelem) { 4765 if (pset_getloadavg_ptr != NULL) { 4766 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem); 4767 } else { 4768 return ::getloadavg(loadavg, nelem); 4769 } 4770 } 4771 4772 //--------------------------------------------------------------------------------- 4773 4774 bool os::find(address addr, outputStream* st) { 4775 Dl_info dlinfo; 4776 memset(&dlinfo, 0, sizeof(dlinfo)); 4777 if (dladdr(addr, &dlinfo) != 0) { 4778 st->print(PTR_FORMAT ": ", addr); 4779 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) { 4780 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr); 4781 } else if (dlinfo.dli_fbase != NULL) { 4782 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase); 4783 } else { 4784 st->print("<absolute address>"); 4785 } 4786 if (dlinfo.dli_fname != NULL) { 4787 st->print(" in %s", dlinfo.dli_fname); 4788 } 4789 if (dlinfo.dli_fbase != NULL) { 4790 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); 4791 } 4792 st->cr(); 4793 4794 if (Verbose) { 4795 // decode some bytes around the PC 4796 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size()); 4797 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); 4798 address lowest = (address) dlinfo.dli_sname; 4799 if (!lowest) lowest = (address) dlinfo.dli_fbase; 4800 if (begin < lowest) begin = lowest; 4801 Dl_info dlinfo2; 4802 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr 4803 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) { 4804 end = (address) dlinfo2.dli_saddr; 4805 } 4806 Disassembler::decode(begin, end, st); 4807 } 4808 return true; 4809 } 4810 return false; 4811 } 4812 4813 // Following function has been added to support HotSparc's libjvm.so running 4814 // under Solaris production JDK 1.2.2 / 1.3.0. These came from 4815 // src/solaris/hpi/native_threads in the EVM codebase. 4816 // 4817 // NOTE: This is no longer needed in the 1.3.1 and 1.4 production release 4818 // libraries and should thus be removed. We will leave it behind for a while 4819 // until we no longer want to able to run on top of 1.3.0 Solaris production 4820 // JDK. See 4341971. 4821 4822 #define STACK_SLACK 0x800 4823 4824 extern "C" { 4825 intptr_t sysThreadAvailableStackWithSlack() { 4826 stack_t st; 4827 intptr_t retval, stack_top; 4828 retval = thr_stksegment(&st); 4829 assert(retval == 0, "incorrect return value from thr_stksegment"); 4830 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned"); 4831 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned"); 4832 stack_top=(intptr_t)st.ss_sp-st.ss_size; 4833 return ((intptr_t)&stack_top - stack_top - STACK_SLACK); 4834 } 4835 } 4836 4837 // ObjectMonitor park-unpark infrastructure ... 4838 // 4839 // We implement Solaris and Linux PlatformEvents with the 4840 // obvious condvar-mutex-flag triple. 4841 // Another alternative that works quite well is pipes: 4842 // Each PlatformEvent consists of a pipe-pair. 4843 // The thread associated with the PlatformEvent 4844 // calls park(), which reads from the input end of the pipe. 4845 // Unpark() writes into the other end of the pipe. 4846 // The write-side of the pipe must be set NDELAY. 4847 // Unfortunately pipes consume a large # of handles. 4848 // Native solaris lwp_park() and lwp_unpark() work nicely, too. 4849 // Using pipes for the 1st few threads might be workable, however. 4850 // 4851 // park() is permitted to return spuriously. 4852 // Callers of park() should wrap the call to park() in 4853 // an appropriate loop. A litmus test for the correct 4854 // usage of park is the following: if park() were modified 4855 // to immediately return 0 your code should still work, 4856 // albeit degenerating to a spin loop. 4857 // 4858 // In a sense, park()-unpark() just provides more polite spinning 4859 // and polling with the key difference over naive spinning being 4860 // that a parked thread needs to be explicitly unparked() in order 4861 // to wake up and to poll the underlying condition. 4862 // 4863 // Assumption: 4864 // Only one parker can exist on an event, which is why we allocate 4865 // them per-thread. Multiple unparkers can coexist. 4866 // 4867 // _Event transitions in park() 4868 // -1 => -1 : illegal 4869 // 1 => 0 : pass - return immediately 4870 // 0 => -1 : block; then set _Event to 0 before returning 4871 // 4872 // _Event transitions in unpark() 4873 // 0 => 1 : just return 4874 // 1 => 1 : just return 4875 // -1 => either 0 or 1; must signal target thread 4876 // That is, we can safely transition _Event from -1 to either 4877 // 0 or 1. 4878 // 4879 // _Event serves as a restricted-range semaphore. 4880 // -1 : thread is blocked, i.e. there is a waiter 4881 // 0 : neutral: thread is running or ready, 4882 // could have been signaled after a wait started 4883 // 1 : signaled - thread is running or ready 4884 // 4885 // Another possible encoding of _Event would be with 4886 // explicit "PARKED" == 01b and "SIGNALED" == 10b bits. 4887 // 4888 // TODO-FIXME: add DTRACE probes for: 4889 // 1. Tx parks 4890 // 2. Ty unparks Tx 4891 // 3. Tx resumes from park 4892 4893 4894 // value determined through experimentation 4895 #define ROUNDINGFIX 11 4896 4897 // utility to compute the abstime argument to timedwait. 4898 // TODO-FIXME: switch from compute_abstime() to unpackTime(). 4899 4900 static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) { 4901 // millis is the relative timeout time 4902 // abstime will be the absolute timeout time 4903 if (millis < 0) millis = 0; 4904 struct timeval now; 4905 int status = gettimeofday(&now, NULL); 4906 assert(status == 0, "gettimeofday"); 4907 jlong seconds = millis / 1000; 4908 jlong max_wait_period; 4909 4910 if (UseLWPSynchronization) { 4911 // forward port of fix for 4275818 (not sleeping long enough) 4912 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where 4913 // _lwp_cond_timedwait() used a round_down algorithm rather 4914 // than a round_up. For millis less than our roundfactor 4915 // it rounded down to 0 which doesn't meet the spec. 4916 // For millis > roundfactor we may return a bit sooner, but 4917 // since we can not accurately identify the patch level and 4918 // this has already been fixed in Solaris 9 and 8 we will 4919 // leave it alone rather than always rounding down. 4920 4921 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX; 4922 // It appears that when we go directly through Solaris _lwp_cond_timedwait() 4923 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6 4924 max_wait_period = 21000000; 4925 } else { 4926 max_wait_period = 50000000; 4927 } 4928 millis %= 1000; 4929 if (seconds > max_wait_period) { // see man cond_timedwait(3T) 4930 seconds = max_wait_period; 4931 } 4932 abstime->tv_sec = now.tv_sec + seconds; 4933 long usec = now.tv_usec + millis * 1000; 4934 if (usec >= 1000000) { 4935 abstime->tv_sec += 1; 4936 usec -= 1000000; 4937 } 4938 abstime->tv_nsec = usec * 1000; 4939 return abstime; 4940 } 4941 4942 void os::PlatformEvent::park() { // AKA: down() 4943 // Transitions for _Event: 4944 // -1 => -1 : illegal 4945 // 1 => 0 : pass - return immediately 4946 // 0 => -1 : block; then set _Event to 0 before returning 4947 4948 // Invariant: Only the thread associated with the Event/PlatformEvent 4949 // may call park(). 4950 assert(_nParked == 0, "invariant"); 4951 4952 int v; 4953 for (;;) { 4954 v = _Event; 4955 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 4956 } 4957 guarantee(v >= 0, "invariant"); 4958 if (v == 0) { 4959 // Do this the hard way by blocking ... 4960 // See http://monaco.sfbay/detail.jsf?cr=5094058. 4961 int status = os::Solaris::mutex_lock(_mutex); 4962 assert_status(status == 0, status, "mutex_lock"); 4963 guarantee(_nParked == 0, "invariant"); 4964 ++_nParked; 4965 while (_Event < 0) { 4966 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... 4967 // Treat this the same as if the wait was interrupted 4968 // With usr/lib/lwp going to kernel, always handle ETIME 4969 status = os::Solaris::cond_wait(_cond, _mutex); 4970 if (status == ETIME) status = EINTR; 4971 assert_status(status == 0 || status == EINTR, status, "cond_wait"); 4972 } 4973 --_nParked; 4974 _Event = 0; 4975 status = os::Solaris::mutex_unlock(_mutex); 4976 assert_status(status == 0, status, "mutex_unlock"); 4977 // Paranoia to ensure our locked and lock-free paths interact 4978 // correctly with each other. 4979 OrderAccess::fence(); 4980 } 4981 } 4982 4983 int os::PlatformEvent::park(jlong millis) { 4984 // Transitions for _Event: 4985 // -1 => -1 : illegal 4986 // 1 => 0 : pass - return immediately 4987 // 0 => -1 : block; then set _Event to 0 before returning 4988 4989 guarantee(_nParked == 0, "invariant"); 4990 int v; 4991 for (;;) { 4992 v = _Event; 4993 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 4994 } 4995 guarantee(v >= 0, "invariant"); 4996 if (v != 0) return OS_OK; 4997 4998 int ret = OS_TIMEOUT; 4999 timestruc_t abst; 5000 compute_abstime(&abst, millis); 5001 5002 // See http://monaco.sfbay/detail.jsf?cr=5094058. 5003 int status = os::Solaris::mutex_lock(_mutex); 5004 assert_status(status == 0, status, "mutex_lock"); 5005 guarantee(_nParked == 0, "invariant"); 5006 ++_nParked; 5007 while (_Event < 0) { 5008 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst); 5009 assert_status(status == 0 || status == EINTR || 5010 status == ETIME || status == ETIMEDOUT, 5011 status, "cond_timedwait"); 5012 if (!FilterSpuriousWakeups) break; // previous semantics 5013 if (status == ETIME || status == ETIMEDOUT) break; 5014 // We consume and ignore EINTR and spurious wakeups. 5015 } 5016 --_nParked; 5017 if (_Event >= 0) ret = OS_OK; 5018 _Event = 0; 5019 status = os::Solaris::mutex_unlock(_mutex); 5020 assert_status(status == 0, status, "mutex_unlock"); 5021 // Paranoia to ensure our locked and lock-free paths interact 5022 // correctly with each other. 5023 OrderAccess::fence(); 5024 return ret; 5025 } 5026 5027 void os::PlatformEvent::unpark() { 5028 // Transitions for _Event: 5029 // 0 => 1 : just return 5030 // 1 => 1 : just return 5031 // -1 => either 0 or 1; must signal target thread 5032 // That is, we can safely transition _Event from -1 to either 5033 // 0 or 1. 5034 // See also: "Semaphores in Plan 9" by Mullender & Cox 5035 // 5036 // Note: Forcing a transition from "-1" to "1" on an unpark() means 5037 // that it will take two back-to-back park() calls for the owning 5038 // thread to block. This has the benefit of forcing a spurious return 5039 // from the first park() call after an unpark() call which will help 5040 // shake out uses of park() and unpark() without condition variables. 5041 5042 if (Atomic::xchg(1, &_Event) >= 0) return; 5043 5044 // If the thread associated with the event was parked, wake it. 5045 // Wait for the thread assoc with the PlatformEvent to vacate. 5046 int status = os::Solaris::mutex_lock(_mutex); 5047 assert_status(status == 0, status, "mutex_lock"); 5048 int AnyWaiters = _nParked; 5049 status = os::Solaris::mutex_unlock(_mutex); 5050 assert_status(status == 0, status, "mutex_unlock"); 5051 guarantee(AnyWaiters == 0 || AnyWaiters == 1, "invariant"); 5052 if (AnyWaiters != 0) { 5053 // Note that we signal() *after* dropping the lock for "immortal" Events. 5054 // This is safe and avoids a common class of futile wakeups. In rare 5055 // circumstances this can cause a thread to return prematurely from 5056 // cond_{timed}wait() but the spurious wakeup is benign and the victim 5057 // will simply re-test the condition and re-park itself. 5058 // This provides particular benefit if the underlying platform does not 5059 // provide wait morphing. 5060 status = os::Solaris::cond_signal(_cond); 5061 assert_status(status == 0, status, "cond_signal"); 5062 } 5063 } 5064 5065 // JSR166 5066 // ------------------------------------------------------- 5067 5068 // The solaris and linux implementations of park/unpark are fairly 5069 // conservative for now, but can be improved. They currently use a 5070 // mutex/condvar pair, plus _counter. 5071 // Park decrements _counter if > 0, else does a condvar wait. Unpark 5072 // sets count to 1 and signals condvar. Only one thread ever waits 5073 // on the condvar. Contention seen when trying to park implies that someone 5074 // is unparking you, so don't wait. And spurious returns are fine, so there 5075 // is no need to track notifications. 5076 5077 #define MAX_SECS 100000000 5078 5079 // This code is common to linux and solaris and will be moved to a 5080 // common place in dolphin. 5081 // 5082 // The passed in time value is either a relative time in nanoseconds 5083 // or an absolute time in milliseconds. Either way it has to be unpacked 5084 // into suitable seconds and nanoseconds components and stored in the 5085 // given timespec structure. 5086 // Given time is a 64-bit value and the time_t used in the timespec is only 5087 // a signed-32-bit value (except on 64-bit Linux) we have to watch for 5088 // overflow if times way in the future are given. Further on Solaris versions 5089 // prior to 10 there is a restriction (see cond_timedwait) that the specified 5090 // number of seconds, in abstime, is less than current_time + 100,000,000. 5091 // As it will be 28 years before "now + 100000000" will overflow we can 5092 // ignore overflow and just impose a hard-limit on seconds using the value 5093 // of "now + 100,000,000". This places a limit on the timeout of about 3.17 5094 // years from "now". 5095 // 5096 static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) { 5097 assert(time > 0, "convertTime"); 5098 5099 struct timeval now; 5100 int status = gettimeofday(&now, NULL); 5101 assert(status == 0, "gettimeofday"); 5102 5103 time_t max_secs = now.tv_sec + MAX_SECS; 5104 5105 if (isAbsolute) { 5106 jlong secs = time / 1000; 5107 if (secs > max_secs) { 5108 absTime->tv_sec = max_secs; 5109 } else { 5110 absTime->tv_sec = secs; 5111 } 5112 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; 5113 } else { 5114 jlong secs = time / NANOSECS_PER_SEC; 5115 if (secs >= MAX_SECS) { 5116 absTime->tv_sec = max_secs; 5117 absTime->tv_nsec = 0; 5118 } else { 5119 absTime->tv_sec = now.tv_sec + secs; 5120 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; 5121 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { 5122 absTime->tv_nsec -= NANOSECS_PER_SEC; 5123 ++absTime->tv_sec; // note: this must be <= max_secs 5124 } 5125 } 5126 } 5127 assert(absTime->tv_sec >= 0, "tv_sec < 0"); 5128 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); 5129 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); 5130 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); 5131 } 5132 5133 void Parker::park(bool isAbsolute, jlong time) { 5134 // Ideally we'd do something useful while spinning, such 5135 // as calling unpackTime(). 5136 5137 // Optional fast-path check: 5138 // Return immediately if a permit is available. 5139 // We depend on Atomic::xchg() having full barrier semantics 5140 // since we are doing a lock-free update to _counter. 5141 if (Atomic::xchg(0, &_counter) > 0) return; 5142 5143 // Optional fast-exit: Check interrupt before trying to wait 5144 Thread* thread = Thread::current(); 5145 assert(thread->is_Java_thread(), "Must be JavaThread"); 5146 JavaThread *jt = (JavaThread *)thread; 5147 if (Thread::is_interrupted(thread, false)) { 5148 return; 5149 } 5150 5151 // First, demultiplex/decode time arguments 5152 timespec absTime; 5153 if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all 5154 return; 5155 } 5156 if (time > 0) { 5157 // Warning: this code might be exposed to the old Solaris time 5158 // round-down bugs. Grep "roundingFix" for details. 5159 unpackTime(&absTime, isAbsolute, time); 5160 } 5161 5162 // Enter safepoint region 5163 // Beware of deadlocks such as 6317397. 5164 // The per-thread Parker:: _mutex is a classic leaf-lock. 5165 // In particular a thread must never block on the Threads_lock while 5166 // holding the Parker:: mutex. If safepoints are pending both the 5167 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. 5168 ThreadBlockInVM tbivm(jt); 5169 5170 // Don't wait if cannot get lock since interference arises from 5171 // unblocking. Also. check interrupt before trying wait 5172 if (Thread::is_interrupted(thread, false) || 5173 os::Solaris::mutex_trylock(_mutex) != 0) { 5174 return; 5175 } 5176 5177 int status; 5178 5179 if (_counter > 0) { // no wait needed 5180 _counter = 0; 5181 status = os::Solaris::mutex_unlock(_mutex); 5182 assert(status == 0, "invariant"); 5183 // Paranoia to ensure our locked and lock-free paths interact 5184 // correctly with each other and Java-level accesses. 5185 OrderAccess::fence(); 5186 return; 5187 } 5188 5189 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 5190 jt->set_suspend_equivalent(); 5191 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 5192 5193 // Do this the hard way by blocking ... 5194 // See http://monaco.sfbay/detail.jsf?cr=5094058. 5195 if (time == 0) { 5196 status = os::Solaris::cond_wait(_cond, _mutex); 5197 } else { 5198 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime); 5199 } 5200 // Note that an untimed cond_wait() can sometimes return ETIME on older 5201 // versions of the Solaris. 5202 assert_status(status == 0 || status == EINTR || 5203 status == ETIME || status == ETIMEDOUT, 5204 status, "cond_timedwait"); 5205 5206 _counter = 0; 5207 status = os::Solaris::mutex_unlock(_mutex); 5208 assert_status(status == 0, status, "mutex_unlock"); 5209 // Paranoia to ensure our locked and lock-free paths interact 5210 // correctly with each other and Java-level accesses. 5211 OrderAccess::fence(); 5212 5213 // If externally suspended while waiting, re-suspend 5214 if (jt->handle_special_suspend_equivalent_condition()) { 5215 jt->java_suspend_self(); 5216 } 5217 } 5218 5219 void Parker::unpark() { 5220 int status = os::Solaris::mutex_lock(_mutex); 5221 assert(status == 0, "invariant"); 5222 const int s = _counter; 5223 _counter = 1; 5224 status = os::Solaris::mutex_unlock(_mutex); 5225 assert(status == 0, "invariant"); 5226 5227 if (s < 1) { 5228 status = os::Solaris::cond_signal(_cond); 5229 assert(status == 0, "invariant"); 5230 } 5231 } 5232 5233 extern char** environ; 5234 5235 // Run the specified command in a separate process. Return its exit value, 5236 // or -1 on failure (e.g. can't fork a new process). 5237 // Unlike system(), this function can be called from signal handler. It 5238 // doesn't block SIGINT et al. 5239 int os::fork_and_exec(char* cmd, bool use_vfork_if_available) { 5240 char * argv[4]; 5241 argv[0] = (char *)"sh"; 5242 argv[1] = (char *)"-c"; 5243 argv[2] = cmd; 5244 argv[3] = NULL; 5245 5246 // fork is async-safe, fork1 is not so can't use in signal handler 5247 pid_t pid; 5248 Thread* t = Thread::current_or_null_safe(); 5249 if (t != NULL && t->is_inside_signal_handler()) { 5250 pid = fork(); 5251 } else { 5252 pid = fork1(); 5253 } 5254 5255 if (pid < 0) { 5256 // fork failed 5257 warning("fork failed: %s", os::strerror(errno)); 5258 return -1; 5259 5260 } else if (pid == 0) { 5261 // child process 5262 5263 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris 5264 execve("/usr/bin/sh", argv, environ); 5265 5266 // execve failed 5267 _exit(-1); 5268 5269 } else { 5270 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 5271 // care about the actual exit code, for now. 5272 5273 int status; 5274 5275 // Wait for the child process to exit. This returns immediately if 5276 // the child has already exited. */ 5277 while (waitpid(pid, &status, 0) < 0) { 5278 switch (errno) { 5279 case ECHILD: return 0; 5280 case EINTR: break; 5281 default: return -1; 5282 } 5283 } 5284 5285 if (WIFEXITED(status)) { 5286 // The child exited normally; get its exit code. 5287 return WEXITSTATUS(status); 5288 } else if (WIFSIGNALED(status)) { 5289 // The child exited because of a signal 5290 // The best value to return is 0x80 + signal number, 5291 // because that is what all Unix shells do, and because 5292 // it allows callers to distinguish between process exit and 5293 // process death by signal. 5294 return 0x80 + WTERMSIG(status); 5295 } else { 5296 // Unknown exit code; pass it through 5297 return status; 5298 } 5299 } 5300 } 5301 5302 size_t os::write(int fd, const void *buf, unsigned int nBytes) { 5303 size_t res; 5304 RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res); 5305 return res; 5306 } 5307 5308 int os::close(int fd) { 5309 return ::close(fd); 5310 } 5311 5312 int os::socket_close(int fd) { 5313 return ::close(fd); 5314 } 5315 5316 int os::recv(int fd, char* buf, size_t nBytes, uint flags) { 5317 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 5318 "Assumed _thread_in_native"); 5319 RESTARTABLE_RETURN_INT((int)::recv(fd, buf, nBytes, flags)); 5320 } 5321 5322 int os::send(int fd, char* buf, size_t nBytes, uint flags) { 5323 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 5324 "Assumed _thread_in_native"); 5325 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags)); 5326 } 5327 5328 int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) { 5329 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags)); 5330 } 5331 5332 // As both poll and select can be interrupted by signals, we have to be 5333 // prepared to restart the system call after updating the timeout, unless 5334 // a poll() is done with timeout == -1, in which case we repeat with this 5335 // "wait forever" value. 5336 5337 int os::connect(int fd, struct sockaddr *him, socklen_t len) { 5338 int _result; 5339 _result = ::connect(fd, him, len); 5340 5341 // On Solaris, when a connect() call is interrupted, the connection 5342 // can be established asynchronously (see 6343810). Subsequent calls 5343 // to connect() must check the errno value which has the semantic 5344 // described below (copied from the connect() man page). Handling 5345 // of asynchronously established connections is required for both 5346 // blocking and non-blocking sockets. 5347 // EINTR The connection attempt was interrupted 5348 // before any data arrived by the delivery of 5349 // a signal. The connection, however, will be 5350 // established asynchronously. 5351 // 5352 // EINPROGRESS The socket is non-blocking, and the connec- 5353 // tion cannot be completed immediately. 5354 // 5355 // EALREADY The socket is non-blocking, and a previous 5356 // connection attempt has not yet been com- 5357 // pleted. 5358 // 5359 // EISCONN The socket is already connected. 5360 if (_result == OS_ERR && errno == EINTR) { 5361 // restarting a connect() changes its errno semantics 5362 RESTARTABLE(::connect(fd, him, len), _result); 5363 // undo these changes 5364 if (_result == OS_ERR) { 5365 if (errno == EALREADY) { 5366 errno = EINPROGRESS; // fall through 5367 } else if (errno == EISCONN) { 5368 errno = 0; 5369 return OS_OK; 5370 } 5371 } 5372 } 5373 return _result; 5374 } 5375 5376 // Get the default path to the core file 5377 // Returns the length of the string 5378 int os::get_core_path(char* buffer, size_t bufferSize) { 5379 const char* p = get_current_directory(buffer, bufferSize); 5380 5381 if (p == NULL) { 5382 assert(p != NULL, "failed to get current directory"); 5383 return 0; 5384 } 5385 5386 jio_snprintf(buffer, bufferSize, "%s/core or core.%d", 5387 p, current_process_id()); 5388 5389 return strlen(buffer); 5390 } 5391 5392 #ifndef PRODUCT 5393 void TestReserveMemorySpecial_test() { 5394 // No tests available for this platform 5395 } 5396 #endif 5397 5398 bool os::start_debugging(char *buf, int buflen) { 5399 int len = (int)strlen(buf); 5400 char *p = &buf[len]; 5401 5402 jio_snprintf(p, buflen-len, 5403 "\n\n" 5404 "Do you want to debug the problem?\n\n" 5405 "To debug, run 'dbx - %d'; then switch to thread " INTX_FORMAT "\n" 5406 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n" 5407 "Otherwise, press RETURN to abort...", 5408 os::current_process_id(), os::current_thread_id()); 5409 5410 bool yes = os::message_box("Unexpected Error", buf); 5411 5412 if (yes) { 5413 // yes, user asked VM to launch debugger 5414 jio_snprintf(buf, sizeof(buf), "dbx - %d", os::current_process_id()); 5415 5416 os::fork_and_exec(buf); 5417 yes = false; 5418 } 5419 return yes; 5420 }