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