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