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