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