os_solaris.cpp revision 9685:15ce8135ef98
1210284Sjmallett/* 2232812Sjmallett * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved. 3215990Sjmallett * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4210284Sjmallett * 5210284Sjmallett * This code is free software; you can redistribute it and/or modify it 6215990Sjmallett * under the terms of the GNU General Public License version 2 only, as 7215990Sjmallett * published by the Free Software Foundation. 8215990Sjmallett * 9210284Sjmallett * This code is distributed in the hope that it will be useful, but WITHOUT 10215990Sjmallett * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11215990Sjmallett * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12210284Sjmallett * version 2 for more details (a copy is included in the LICENSE file that 13215990Sjmallett * accompanied this code). 14215990Sjmallett * 15215990Sjmallett * You should have received a copy of the GNU General Public License version 16215990Sjmallett * 2 along with this work; if not, write to the Free Software Foundation, 17215990Sjmallett * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18232812Sjmallett * 19215990Sjmallett * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20215990Sjmallett * or visit www.oracle.com if you need additional information or have any 21215990Sjmallett * questions. 22215990Sjmallett * 23215990Sjmallett */ 24215990Sjmallett 25215990Sjmallett// no precompiled headers 26215990Sjmallett#include "classfile/classLoader.hpp" 27215990Sjmallett#include "classfile/systemDictionary.hpp" 28215990Sjmallett#include "classfile/vmSymbols.hpp" 29232812Sjmallett#include "code/icBuffer.hpp" 30215990Sjmallett#include "code/vtableStubs.hpp" 31215990Sjmallett#include "compiler/compileBroker.hpp" 32215990Sjmallett#include "compiler/disassembler.hpp" 33215990Sjmallett#include "interpreter/interpreter.hpp" 34215990Sjmallett#include "jvm_solaris.h" 35215990Sjmallett#include "memory/allocation.inline.hpp" 36215990Sjmallett#include "memory/filemap.hpp" 37215990Sjmallett#include "mutex_solaris.inline.hpp" 38210284Sjmallett#include "oops/oop.inline.hpp" 39210284Sjmallett#include "os_share_solaris.hpp" 40210284Sjmallett#include "os_solaris.inline.hpp" 41210284Sjmallett#include "prims/jniFastGetField.hpp" 42210284Sjmallett#include "prims/jvm.h" 43210284Sjmallett#include "prims/jvm_misc.hpp" 44210284Sjmallett#include "runtime/arguments.hpp" 45215990Sjmallett#include "runtime/atomic.inline.hpp" 46210284Sjmallett#include "runtime/extendedPC.hpp" 47210284Sjmallett#include "runtime/globals.hpp" 48210284Sjmallett#include "runtime/interfaceSupport.hpp" 49210284Sjmallett#include "runtime/java.hpp" 50210284Sjmallett#include "runtime/javaCalls.hpp" 51210284Sjmallett#include "runtime/mutexLocker.hpp" 52232812Sjmallett#include "runtime/objectMonitor.hpp" 53210284Sjmallett#include "runtime/orderAccess.inline.hpp" 54210284Sjmallett#include "runtime/osThread.hpp" 55210284Sjmallett#include "runtime/perfMemory.hpp" 56210284Sjmallett#include "runtime/sharedRuntime.hpp" 57210284Sjmallett#include "runtime/statSampler.hpp" 58210284Sjmallett#include "runtime/stubRoutines.hpp" 59210284Sjmallett#include "runtime/thread.inline.hpp" 60210284Sjmallett#include "runtime/threadCritical.hpp" 61210284Sjmallett#include "runtime/timer.hpp" 62210284Sjmallett#include "runtime/vm_version.hpp" 63210284Sjmallett#include "semaphore_posix.hpp" 64210284Sjmallett#include "services/attachListener.hpp" 65210284Sjmallett#include "services/memTracker.hpp" 66210284Sjmallett#include "services/runtimeService.hpp" 67210284Sjmallett#include "utilities/decoder.hpp" 68210284Sjmallett#include "utilities/defaultStream.hpp" 69210284Sjmallett#include "utilities/events.hpp" 70210284Sjmallett#include "utilities/growableArray.hpp" 71210284Sjmallett#include "utilities/vmError.hpp" 72210284Sjmallett 73210284Sjmallett// put OS-includes here 74210284Sjmallett# include <dlfcn.h> 75210284Sjmallett# include <errno.h> 76210284Sjmallett# include <exception> 77210284Sjmallett# include <link.h> 78210284Sjmallett# include <poll.h> 79210284Sjmallett# include <pthread.h> 80210284Sjmallett# include <pwd.h> 81210284Sjmallett# include <schedctl.h> 82210284Sjmallett# include <setjmp.h> 83210284Sjmallett# include <signal.h> 84210284Sjmallett# include <stdio.h> 85210284Sjmallett# include <alloca.h> 86210284Sjmallett# include <sys/filio.h> 87210284Sjmallett# include <sys/ipc.h> 88210284Sjmallett# include <sys/lwp.h> 89210284Sjmallett# include <sys/machelf.h> // for elf Sym structure used by dladdr1 90210284Sjmallett# include <sys/mman.h> 91210284Sjmallett# include <sys/processor.h> 92210284Sjmallett# include <sys/procset.h> 93210284Sjmallett# include <sys/pset.h> 94210284Sjmallett# include <sys/resource.h> 95210284Sjmallett# include <sys/shm.h> 96210284Sjmallett# include <sys/socket.h> 97210284Sjmallett# include <sys/stat.h> 98210284Sjmallett# include <sys/systeminfo.h> 99210284Sjmallett# include <sys/time.h> 100210284Sjmallett# include <sys/times.h> 101210284Sjmallett# include <sys/types.h> 102210284Sjmallett# include <sys/wait.h> 103210284Sjmallett# include <sys/utsname.h> 104210284Sjmallett# include <thread.h> 105210284Sjmallett# include <unistd.h> 106210284Sjmallett# include <sys/priocntl.h> 107210284Sjmallett# include <sys/rtpriocntl.h> 108210311Sjmallett# include <sys/tspriocntl.h> 109215990Sjmallett# include <sys/iapriocntl.h> 110210284Sjmallett# include <sys/fxpriocntl.h> 111210284Sjmallett# include <sys/loadavg.h> 112210284Sjmallett# include <string.h> 113210284Sjmallett# include <stdio.h> 114210284Sjmallett 115210284Sjmallett# define _STRUCTURED_PROC 1 // this gets us the new structured proc interfaces of 5.6 & later 116210284Sjmallett# include <sys/procfs.h> // see comment in <sys/procfs.h> 117210284Sjmallett 118210284Sjmallett#define MAX_PATH (2 * K) 119210284Sjmallett 120210284Sjmallett// for timer info max values which include all bits 121210284Sjmallett#define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF) 122210284Sjmallett 123210284Sjmallett 124215990Sjmallett// Here are some liblgrp types from sys/lgrp_user.h to be able to 125210311Sjmallett// compile on older systems without this header file. 126210311Sjmallett 127215990Sjmallett#ifndef MADV_ACCESS_LWP 128210284Sjmallett #define MADV_ACCESS_LWP 7 /* next LWP to access heavily */ 129215990Sjmallett#endif 130215990Sjmallett#ifndef MADV_ACCESS_MANY 131210311Sjmallett #define MADV_ACCESS_MANY 8 /* many processes to access heavily */ 132215990Sjmallett#endif 133210284Sjmallett 134210284Sjmallett#ifndef LGRP_RSRC_CPU 135210284Sjmallett #define LGRP_RSRC_CPU 0 /* CPU resources */ 136210284Sjmallett#endif 137210284Sjmallett#ifndef LGRP_RSRC_MEM 138210284Sjmallett #define LGRP_RSRC_MEM 1 /* memory resources */ 139210284Sjmallett#endif 140210284Sjmallett 141210284Sjmallett// Values for ThreadPriorityPolicy == 1 142210284Sjmallettint prio_policy1[CriticalPriority+1] = { 143210284Sjmallett -99999, 0, 16, 32, 48, 64, 144210284Sjmallett 80, 96, 112, 124, 127, 127 }; 145210284Sjmallett 146210284Sjmallett// System parameters used internally 147210284Sjmallettstatic clock_t clock_tics_per_sec = 100; 148210284Sjmallett 149210284Sjmallett// Track if we have called enable_extended_FILE_stdio (on Solaris 10u4+) 150210284Sjmallettstatic bool enabled_extended_FILE_stdio = false; 151210284Sjmallett 152210284Sjmallett// For diagnostics to print a message once. see run_periodic_checks 153210284Sjmallettstatic bool check_addr0_done = false; 154210284Sjmallettstatic sigset_t check_signal_done; 155210284Sjmallettstatic bool check_signals = true; 156210284Sjmallett 157210284Sjmallettaddress os::Solaris::handler_start; // start pc of thr_sighndlrinfo 158215990Sjmallettaddress os::Solaris::handler_end; // end pc of thr_sighndlrinfo 159215990Sjmallett 160215990Sjmallettaddress os::Solaris::_main_stack_base = NULL; // 4352906 workaround 161215990Sjmallett 162210284Sjmallett 163215990Sjmallett// "default" initializers for missing libc APIs 164215990Sjmallettextern "C" { 165215990Sjmallett static int lwp_mutex_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; } 166215990Sjmallett static int lwp_mutex_destroy(mutex_t *mx) { return 0; } 167215990Sjmallett 168215990Sjmallett static int lwp_cond_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; } 169215990Sjmallett static int lwp_cond_destroy(cond_t *cv) { return 0; } 170215990Sjmallett} 171215990Sjmallett 172215990Sjmallett// "default" initializers for pthread-based synchronization 173215990Sjmallettextern "C" { 174215990Sjmallett static int pthread_mutex_default_init(mutex_t *mx, int scope, void *arg) { memset(mx, 0, sizeof(mutex_t)); return 0; } 175215990Sjmallett static int pthread_cond_default_init(cond_t *cv, int scope, void *arg){ memset(cv, 0, sizeof(cond_t)); return 0; } 176215990Sjmallett} 177215990Sjmallett 178215990Sjmallettstatic void unpackTime(timespec* absTime, bool isAbsolute, jlong time); 179215990Sjmallett 180215990Sjmallettstatic inline size_t adjust_stack_size(address base, size_t size) { 181215990Sjmallett if ((ssize_t)size < 0) { 182215990Sjmallett // 4759953: Compensate for ridiculous stack size. 183215990Sjmallett size = max_intx; 184215990Sjmallett } 185215990Sjmallett if (size > (size_t)base) { 186215990Sjmallett // 4812466: Make sure size doesn't allow the stack to wrap the address space. 187215990Sjmallett size = (size_t)base; 188210284Sjmallett } 189210284Sjmallett return size; 190210284Sjmallett} 191210284Sjmallett 192210284Sjmallettstatic inline stack_t get_stack_info() { 193210284Sjmallett stack_t st; 194210284Sjmallett int retval = thr_stksegment(&st); 195210284Sjmallett st.ss_size = adjust_stack_size((address)st.ss_sp, st.ss_size); 196210284Sjmallett assert(retval == 0, "incorrect return value from thr_stksegment"); 197210284Sjmallett assert((address)&st < (address)st.ss_sp, "Invalid stack base returned"); 198210284Sjmallett assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned"); 199210284Sjmallett return st; 200210284Sjmallett} 201210284Sjmallett 202210284Sjmallettaddress os::current_stack_base() { 203210284Sjmallett int r = thr_main(); 204210284Sjmallett guarantee(r == 0 || r == 1, "CR6501650 or CR6493689"); 205210284Sjmallett bool is_primordial_thread = r; 206210284Sjmallett 207210284Sjmallett // Workaround 4352906, avoid calls to thr_stksegment by 208210284Sjmallett // thr_main after the first one (it looks like we trash 209210284Sjmallett // some data, causing the value for ss_sp to be incorrect). 210210284Sjmallett if (!is_primordial_thread || os::Solaris::_main_stack_base == NULL) { 211210284Sjmallett stack_t st = get_stack_info(); 212210284Sjmallett if (is_primordial_thread) { 213210284Sjmallett // cache initial value of stack base 214210284Sjmallett os::Solaris::_main_stack_base = (address)st.ss_sp; 215210284Sjmallett } 216210284Sjmallett return (address)st.ss_sp; 217210284Sjmallett } else { 218210284Sjmallett guarantee(os::Solaris::_main_stack_base != NULL, "Attempt to use null cached stack base"); 219210284Sjmallett return os::Solaris::_main_stack_base; 220210284Sjmallett } 221210284Sjmallett} 222232812Sjmallett 223210284Sjmallettsize_t os::current_stack_size() { 224210284Sjmallett size_t size; 225210284Sjmallett 226210284Sjmallett int r = thr_main(); 227210284Sjmallett guarantee(r == 0 || r == 1, "CR6501650 or CR6493689"); 228210284Sjmallett if (!r) { 229210284Sjmallett size = get_stack_info().ss_size; 230232812Sjmallett } else { 231232812Sjmallett struct rlimit limits; 232210284Sjmallett getrlimit(RLIMIT_STACK, &limits); 233215990Sjmallett size = adjust_stack_size(os::Solaris::_main_stack_base, (size_t)limits.rlim_cur); 234210311Sjmallett } 235210311Sjmallett // base may not be page aligned 236210311Sjmallett address base = current_stack_base(); 237210284Sjmallett address bottom = (address)align_size_up((intptr_t)(base - size), os::vm_page_size());; 238210284Sjmallett return (size_t)(base - bottom); 239210284Sjmallett} 240210284Sjmallett 241210284Sjmallettstruct tm* os::localtime_pd(const time_t* clock, struct tm* res) { 242210284Sjmallett return localtime_r(clock, res); 243210284Sjmallett} 244 245void 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 260static int _processors_online = 0; 261 262jint os::Solaris::_os_thread_limit = 0; 263volatile jint os::Solaris::_os_thread_count = 0; 264 265julong os::available_memory() { 266 return Solaris::available_memory(); 267} 268 269julong os::Solaris::available_memory() { 270 return (julong)sysconf(_SC_AVPHYS_PAGES) * os::vm_page_size(); 271} 272 273julong os::Solaris::_physical_memory = 0; 274 275julong os::physical_memory() { 276 return Solaris::physical_memory(); 277} 278 279static hrtime_t first_hrtime = 0; 280static const hrtime_t hrtime_hz = 1000*1000*1000; 281static volatile hrtime_t max_hrtime = 0; 282 283 284void 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 291int 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 309static 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 341static 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 376static 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 441void os::set_native_thread_name(const char *name) { 442 // Not yet implemented. 443 return; 444} 445 446bool 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 473bool 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 487bool 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 498void 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 688void os::breakpoint() { 689 BREAKPOINT; 690} 691 692bool 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 705bool 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 712extern "C" void breakpoint() { 713 // use debugger to set breakpoint here 714} 715 716static thread_t main_thread; 717 718// Thread start routine for all new Java threads 719extern "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 791static 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 819void os::Solaris::hotspot_sigmask(Thread* thread) { 820 //Save caller's signal mask 821 sigset_t sigmask; 822 thr_sigsetmask(SIG_SETMASK, NULL, &sigmask); 823 OSThread *osthread = thread->osthread(); 824 osthread->set_caller_sigmask(sigmask); 825 826 thr_sigsetmask(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 thr_sigsetmask(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 thr_sigsetmask(SIG_BLOCK, vm_signals(), NULL); 835 } 836 } 837} 838 839bool 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 859bool 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 883bool 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 1012debug_only(static bool signal_sets_initialized = false); 1013static sigset_t unblocked_sigs, vm_sigs, allowdebug_blocked_sigs; 1014 1015int os::Solaris::_SIGasync = ASYNC_SIGNAL; 1016 1017bool 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 1031static bool isJVM1available() { 1032 return SIGJVM1 < SIGRTMIN; 1033} 1034 1035void 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.) 1091sigset_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. 1098sigset_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 1104sigset_t* os::Solaris::allowdebug_blocked_signals() { 1105 assert(signal_sets_initialized, "Not initialized"); 1106 return &allowdebug_blocked_sigs; 1107} 1108 1109 1110void _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. 1116void 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 1178void 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 thr_sigsetmask(SIG_SETMASK, &sigmask, NULL); 1192 } 1193 delete osthread; 1194} 1195 1196void 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 1202intx os::current_thread_id() { 1203 return (intx)thr_self(); 1204} 1205 1206static pid_t _initial_pid = 0; 1207 1208int 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. 1216inline 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. 1241double os::elapsedTime() { 1242 return (double)(getTimeNanos() - first_hrtime) / (double)hrtime_hz; 1243} 1244 1245jlong os::elapsed_counter() { 1246 return (jlong)(getTimeNanos() - first_hrtime); 1247} 1248 1249jlong 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. 1255bool 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 1275bool os::supports_vtime() { return true; } 1276 1277bool 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 1292bool 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 1307double 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 1313jlong 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 1319jlong 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 1327void 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 1337jlong os::javaTimeNanos() { 1338 return (jlong)getTimeNanos(); 1339} 1340 1341void 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 1348char * 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. 1362void 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. 1383void os::abort(bool dump_core, void* siginfo, 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. 1401void os::die() { 1402 ::abort(); // dump core (for debugging) 1403} 1404 1405// DLL functions 1406 1407const 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. 1411const char* os::get_temp_directory() { return "/tmp"; } 1412 1413static 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 1421bool 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 1468bool 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 1486typedef int (*dladdr1_func_type)(void *, Dl_info *, void **, int); 1487static dladdr1_func_type dladdr1_func = NULL; 1488 1489bool 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 1562bool 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 1584int 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 1621int _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 1627void 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 1638void * 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 1769void* os::dll_lookup(void* handle, const char* name) { 1770 return dlsym(handle, name); 1771} 1772 1773void* os::get_default_process_handle() { 1774 return (void*)::dlopen(NULL, RTLD_LAZY); 1775} 1776 1777int 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 1787static 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 1804void 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 1812void 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 1826void 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 1833void 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 1853void os::Solaris::print_libversion_info(outputStream* st) { 1854 st->print(" (T2 libthread)"); 1855 st->cr(); 1856} 1857 1858static 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 1880void 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 1896void os::pd_print_cpu_info(outputStream* st, char* buf, size_t buflen) { 1897 // Nothing to do for now. 1898} 1899 1900void 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 1909void os::print_siginfo(outputStream* st, void* siginfo) { 1910 const siginfo_t* si = (const siginfo_t*)siginfo; 1911 1912 os::Posix::print_siginfo_brief(st, si); 1913 1914 if (si && (si->si_signo == SIGBUS || si->si_signo == SIGSEGV) && 1915 UseSharedSpaces) { 1916 FileMapInfo* mapinfo = FileMapInfo::current_info(); 1917 if (mapinfo->is_in_shared_space(si->si_addr)) { 1918 st->print("\n\nError accessing class data sharing archive." \ 1919 " Mapped file inaccessible during execution, " \ 1920 " possible disk/network problem."); 1921 } 1922 } 1923 st->cr(); 1924} 1925 1926// Moved from whole group, because we need them here for diagnostic 1927// prints. 1928#define OLDMAXSIGNUM 32 1929static int Maxsignum = 0; 1930static int *ourSigFlags = NULL; 1931 1932int os::Solaris::get_our_sigflags(int sig) { 1933 assert(ourSigFlags!=NULL, "signal data structure not initialized"); 1934 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range"); 1935 return ourSigFlags[sig]; 1936} 1937 1938void os::Solaris::set_our_sigflags(int sig, int flags) { 1939 assert(ourSigFlags!=NULL, "signal data structure not initialized"); 1940 assert(sig > 0 && sig < Maxsignum, "vm signal out of expected range"); 1941 ourSigFlags[sig] = flags; 1942} 1943 1944 1945static const char* get_signal_handler_name(address handler, 1946 char* buf, int buflen) { 1947 int offset; 1948 bool found = os::dll_address_to_library_name(handler, buf, buflen, &offset); 1949 if (found) { 1950 // skip directory names 1951 const char *p1, *p2; 1952 p1 = buf; 1953 size_t len = strlen(os::file_separator()); 1954 while ((p2 = strstr(p1, os::file_separator())) != NULL) p1 = p2 + len; 1955 jio_snprintf(buf, buflen, "%s+0x%x", p1, offset); 1956 } else { 1957 jio_snprintf(buf, buflen, PTR_FORMAT, handler); 1958 } 1959 return buf; 1960} 1961 1962static void print_signal_handler(outputStream* st, int sig, 1963 char* buf, size_t buflen) { 1964 struct sigaction sa; 1965 1966 sigaction(sig, NULL, &sa); 1967 1968 st->print("%s: ", os::exception_name(sig, buf, buflen)); 1969 1970 address handler = (sa.sa_flags & SA_SIGINFO) 1971 ? CAST_FROM_FN_PTR(address, sa.sa_sigaction) 1972 : CAST_FROM_FN_PTR(address, sa.sa_handler); 1973 1974 if (handler == CAST_FROM_FN_PTR(address, SIG_DFL)) { 1975 st->print("SIG_DFL"); 1976 } else if (handler == CAST_FROM_FN_PTR(address, SIG_IGN)) { 1977 st->print("SIG_IGN"); 1978 } else { 1979 st->print("[%s]", get_signal_handler_name(handler, buf, buflen)); 1980 } 1981 1982 st->print(", sa_mask[0]="); 1983 os::Posix::print_signal_set_short(st, &sa.sa_mask); 1984 1985 address rh = VMError::get_resetted_sighandler(sig); 1986 // May be, handler was resetted by VMError? 1987 if (rh != NULL) { 1988 handler = rh; 1989 sa.sa_flags = VMError::get_resetted_sigflags(sig); 1990 } 1991 1992 st->print(", sa_flags="); 1993 os::Posix::print_sa_flags(st, sa.sa_flags); 1994 1995 // Check: is it our handler? 1996 if (handler == CAST_FROM_FN_PTR(address, signalHandler)) { 1997 // It is our signal handler 1998 // check for flags 1999 if (sa.sa_flags != os::Solaris::get_our_sigflags(sig)) { 2000 st->print( 2001 ", flags was changed from " PTR32_FORMAT ", consider using jsig library", 2002 os::Solaris::get_our_sigflags(sig)); 2003 } 2004 } 2005 st->cr(); 2006} 2007 2008void os::print_signal_handlers(outputStream* st, char* buf, size_t buflen) { 2009 st->print_cr("Signal Handlers:"); 2010 print_signal_handler(st, SIGSEGV, buf, buflen); 2011 print_signal_handler(st, SIGBUS , buf, buflen); 2012 print_signal_handler(st, SIGFPE , buf, buflen); 2013 print_signal_handler(st, SIGPIPE, buf, buflen); 2014 print_signal_handler(st, SIGXFSZ, buf, buflen); 2015 print_signal_handler(st, SIGILL , buf, buflen); 2016 print_signal_handler(st, ASYNC_SIGNAL, buf, buflen); 2017 print_signal_handler(st, BREAK_SIGNAL, buf, buflen); 2018 print_signal_handler(st, SHUTDOWN1_SIGNAL , buf, buflen); 2019 print_signal_handler(st, SHUTDOWN2_SIGNAL , buf, buflen); 2020 print_signal_handler(st, SHUTDOWN3_SIGNAL, buf, buflen); 2021 print_signal_handler(st, os::Solaris::SIGasync(), buf, buflen); 2022} 2023 2024static char saved_jvm_path[MAXPATHLEN] = { 0 }; 2025 2026// Find the full path to the current module, libjvm.so 2027void os::jvm_path(char *buf, jint buflen) { 2028 // Error checking. 2029 if (buflen < MAXPATHLEN) { 2030 assert(false, "must use a large-enough buffer"); 2031 buf[0] = '\0'; 2032 return; 2033 } 2034 // Lazy resolve the path to current module. 2035 if (saved_jvm_path[0] != 0) { 2036 strcpy(buf, saved_jvm_path); 2037 return; 2038 } 2039 2040 Dl_info dlinfo; 2041 int ret = dladdr(CAST_FROM_FN_PTR(void *, os::jvm_path), &dlinfo); 2042 assert(ret != 0, "cannot locate libjvm"); 2043 if (ret != 0 && dlinfo.dli_fname != NULL) { 2044 realpath((char *)dlinfo.dli_fname, buf); 2045 } else { 2046 buf[0] = '\0'; 2047 return; 2048 } 2049 2050 if (Arguments::sun_java_launcher_is_altjvm()) { 2051 // Support for the java launcher's '-XXaltjvm=<path>' option. Typical 2052 // value for buf is "<JAVA_HOME>/jre/lib/<arch>/<vmtype>/libjvm.so". 2053 // If "/jre/lib/" appears at the right place in the string, then 2054 // assume we are installed in a JDK and we're done. Otherwise, check 2055 // for a JAVA_HOME environment variable and fix up the path so it 2056 // looks like libjvm.so is installed there (append a fake suffix 2057 // hotspot/libjvm.so). 2058 const char *p = buf + strlen(buf) - 1; 2059 for (int count = 0; p > buf && count < 5; ++count) { 2060 for (--p; p > buf && *p != '/'; --p) 2061 /* empty */ ; 2062 } 2063 2064 if (strncmp(p, "/jre/lib/", 9) != 0) { 2065 // Look for JAVA_HOME in the environment. 2066 char* java_home_var = ::getenv("JAVA_HOME"); 2067 if (java_home_var != NULL && java_home_var[0] != 0) { 2068 char cpu_arch[12]; 2069 char* jrelib_p; 2070 int len; 2071 sysinfo(SI_ARCHITECTURE, cpu_arch, sizeof(cpu_arch)); 2072#ifdef _LP64 2073 // If we are on sparc running a 64-bit vm, look in jre/lib/sparcv9. 2074 if (strcmp(cpu_arch, "sparc") == 0) { 2075 strcat(cpu_arch, "v9"); 2076 } else if (strcmp(cpu_arch, "i386") == 0) { 2077 strcpy(cpu_arch, "amd64"); 2078 } 2079#endif 2080 // Check the current module name "libjvm.so". 2081 p = strrchr(buf, '/'); 2082 assert(strstr(p, "/libjvm") == p, "invalid library name"); 2083 2084 realpath(java_home_var, buf); 2085 // determine if this is a legacy image or modules image 2086 // modules image doesn't have "jre" subdirectory 2087 len = strlen(buf); 2088 assert(len < buflen, "Ran out of buffer space"); 2089 jrelib_p = buf + len; 2090 snprintf(jrelib_p, buflen-len, "/jre/lib/%s", cpu_arch); 2091 if (0 != access(buf, F_OK)) { 2092 snprintf(jrelib_p, buflen-len, "/lib/%s", cpu_arch); 2093 } 2094 2095 if (0 == access(buf, F_OK)) { 2096 // Use current module name "libjvm.so" 2097 len = strlen(buf); 2098 snprintf(buf + len, buflen-len, "/hotspot/libjvm.so"); 2099 } else { 2100 // Go back to path of .so 2101 realpath((char *)dlinfo.dli_fname, buf); 2102 } 2103 } 2104 } 2105 } 2106 2107 strncpy(saved_jvm_path, buf, MAXPATHLEN); 2108 saved_jvm_path[MAXPATHLEN - 1] = '\0'; 2109} 2110 2111 2112void os::print_jni_name_prefix_on(outputStream* st, int args_size) { 2113 // no prefix required, not even "_" 2114} 2115 2116 2117void os::print_jni_name_suffix_on(outputStream* st, int args_size) { 2118 // no suffix required 2119} 2120 2121// This method is a copy of JDK's sysGetLastErrorString 2122// from src/solaris/hpi/src/system_md.c 2123 2124size_t os::lasterror(char *buf, size_t len) { 2125 if (errno == 0) return 0; 2126 2127 const char *s = ::strerror(errno); 2128 size_t n = ::strlen(s); 2129 if (n >= len) { 2130 n = len - 1; 2131 } 2132 ::strncpy(buf, s, n); 2133 buf[n] = '\0'; 2134 return n; 2135} 2136 2137 2138// sun.misc.Signal 2139 2140extern "C" { 2141 static void UserHandler(int sig, void *siginfo, void *context) { 2142 // Ctrl-C is pressed during error reporting, likely because the error 2143 // handler fails to abort. Let VM die immediately. 2144 if (sig == SIGINT && is_error_reported()) { 2145 os::die(); 2146 } 2147 2148 os::signal_notify(sig); 2149 // We do not need to reinstate the signal handler each time... 2150 } 2151} 2152 2153void* os::user_handler() { 2154 return CAST_FROM_FN_PTR(void*, UserHandler); 2155} 2156 2157struct timespec PosixSemaphore::create_timespec(unsigned int sec, int nsec) { 2158 struct timespec ts; 2159 unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec); 2160 2161 return ts; 2162} 2163 2164extern "C" { 2165 typedef void (*sa_handler_t)(int); 2166 typedef void (*sa_sigaction_t)(int, siginfo_t *, void *); 2167} 2168 2169void* os::signal(int signal_number, void* handler) { 2170 struct sigaction sigAct, oldSigAct; 2171 sigfillset(&(sigAct.sa_mask)); 2172 sigAct.sa_flags = SA_RESTART & ~SA_RESETHAND; 2173 sigAct.sa_handler = CAST_TO_FN_PTR(sa_handler_t, handler); 2174 2175 if (sigaction(signal_number, &sigAct, &oldSigAct)) { 2176 // -1 means registration failed 2177 return (void *)-1; 2178 } 2179 2180 return CAST_FROM_FN_PTR(void*, oldSigAct.sa_handler); 2181} 2182 2183void os::signal_raise(int signal_number) { 2184 raise(signal_number); 2185} 2186 2187// The following code is moved from os.cpp for making this 2188// code platform specific, which it is by its very nature. 2189 2190// a counter for each possible signal value 2191static int Sigexit = 0; 2192static int Maxlibjsigsigs; 2193static jint *pending_signals = NULL; 2194static int *preinstalled_sigs = NULL; 2195static struct sigaction *chainedsigactions = NULL; 2196static sema_t sig_sem; 2197typedef int (*version_getting_t)(); 2198version_getting_t os::Solaris::get_libjsig_version = NULL; 2199static int libjsigversion = NULL; 2200 2201int os::sigexitnum_pd() { 2202 assert(Sigexit > 0, "signal memory not yet initialized"); 2203 return Sigexit; 2204} 2205 2206void os::Solaris::init_signal_mem() { 2207 // Initialize signal structures 2208 Maxsignum = SIGRTMAX; 2209 Sigexit = Maxsignum+1; 2210 assert(Maxsignum >0, "Unable to obtain max signal number"); 2211 2212 Maxlibjsigsigs = Maxsignum; 2213 2214 // pending_signals has one int per signal 2215 // The additional signal is for SIGEXIT - exit signal to signal_thread 2216 pending_signals = (jint *)os::malloc(sizeof(jint) * (Sigexit+1), mtInternal); 2217 memset(pending_signals, 0, (sizeof(jint) * (Sigexit+1))); 2218 2219 if (UseSignalChaining) { 2220 chainedsigactions = (struct sigaction *)malloc(sizeof(struct sigaction) 2221 * (Maxsignum + 1), mtInternal); 2222 memset(chainedsigactions, 0, (sizeof(struct sigaction) * (Maxsignum + 1))); 2223 preinstalled_sigs = (int *)os::malloc(sizeof(int) * (Maxsignum + 1), mtInternal); 2224 memset(preinstalled_sigs, 0, (sizeof(int) * (Maxsignum + 1))); 2225 } 2226 ourSigFlags = (int*)malloc(sizeof(int) * (Maxsignum + 1), mtInternal); 2227 memset(ourSigFlags, 0, sizeof(int) * (Maxsignum + 1)); 2228} 2229 2230void os::signal_init_pd() { 2231 int ret; 2232 2233 ret = ::sema_init(&sig_sem, 0, NULL, NULL); 2234 assert(ret == 0, "sema_init() failed"); 2235} 2236 2237void os::signal_notify(int signal_number) { 2238 int ret; 2239 2240 Atomic::inc(&pending_signals[signal_number]); 2241 ret = ::sema_post(&sig_sem); 2242 assert(ret == 0, "sema_post() failed"); 2243} 2244 2245static int check_pending_signals(bool wait_for_signal) { 2246 int ret; 2247 while (true) { 2248 for (int i = 0; i < Sigexit + 1; i++) { 2249 jint n = pending_signals[i]; 2250 if (n > 0 && n == Atomic::cmpxchg(n - 1, &pending_signals[i], n)) { 2251 return i; 2252 } 2253 } 2254 if (!wait_for_signal) { 2255 return -1; 2256 } 2257 JavaThread *thread = JavaThread::current(); 2258 ThreadBlockInVM tbivm(thread); 2259 2260 bool threadIsSuspended; 2261 do { 2262 thread->set_suspend_equivalent(); 2263 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 2264 while ((ret = ::sema_wait(&sig_sem)) == EINTR) 2265 ; 2266 assert(ret == 0, "sema_wait() failed"); 2267 2268 // were we externally suspended while we were waiting? 2269 threadIsSuspended = thread->handle_special_suspend_equivalent_condition(); 2270 if (threadIsSuspended) { 2271 // The semaphore has been incremented, but while we were waiting 2272 // another thread suspended us. We don't want to continue running 2273 // while suspended because that would surprise the thread that 2274 // suspended us. 2275 ret = ::sema_post(&sig_sem); 2276 assert(ret == 0, "sema_post() failed"); 2277 2278 thread->java_suspend_self(); 2279 } 2280 } while (threadIsSuspended); 2281 } 2282} 2283 2284int os::signal_lookup() { 2285 return check_pending_signals(false); 2286} 2287 2288int os::signal_wait() { 2289 return check_pending_signals(true); 2290} 2291 2292//////////////////////////////////////////////////////////////////////////////// 2293// Virtual Memory 2294 2295static int page_size = -1; 2296 2297// The mmap MAP_ALIGN flag is supported on Solaris 9 and later. init_2() will 2298// clear this var if support is not available. 2299static bool has_map_align = true; 2300 2301int os::vm_page_size() { 2302 assert(page_size != -1, "must call os::init"); 2303 return page_size; 2304} 2305 2306// Solaris allocates memory by pages. 2307int os::vm_allocation_granularity() { 2308 assert(page_size != -1, "must call os::init"); 2309 return page_size; 2310} 2311 2312static bool recoverable_mmap_error(int err) { 2313 // See if the error is one we can let the caller handle. This 2314 // list of errno values comes from the Solaris mmap(2) man page. 2315 switch (err) { 2316 case EBADF: 2317 case EINVAL: 2318 case ENOTSUP: 2319 // let the caller deal with these errors 2320 return true; 2321 2322 default: 2323 // Any remaining errors on this OS can cause our reserved mapping 2324 // to be lost. That can cause confusion where different data 2325 // structures think they have the same memory mapped. The worst 2326 // scenario is if both the VM and a library think they have the 2327 // same memory mapped. 2328 return false; 2329 } 2330} 2331 2332static void warn_fail_commit_memory(char* addr, size_t bytes, bool exec, 2333 int err) { 2334 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 2335 ", %d) failed; error='%s' (errno=%d)", addr, bytes, exec, 2336 strerror(err), err); 2337} 2338 2339static void warn_fail_commit_memory(char* addr, size_t bytes, 2340 size_t alignment_hint, bool exec, 2341 int err) { 2342 warning("INFO: os::commit_memory(" PTR_FORMAT ", " SIZE_FORMAT 2343 ", " SIZE_FORMAT ", %d) failed; error='%s' (errno=%d)", addr, bytes, 2344 alignment_hint, exec, strerror(err), err); 2345} 2346 2347int os::Solaris::commit_memory_impl(char* addr, size_t bytes, bool exec) { 2348 int prot = exec ? PROT_READ|PROT_WRITE|PROT_EXEC : PROT_READ|PROT_WRITE; 2349 size_t size = bytes; 2350 char *res = Solaris::mmap_chunk(addr, size, MAP_PRIVATE|MAP_FIXED, prot); 2351 if (res != NULL) { 2352 if (UseNUMAInterleaving) { 2353 numa_make_global(addr, bytes); 2354 } 2355 return 0; 2356 } 2357 2358 int err = errno; // save errno from mmap() call in mmap_chunk() 2359 2360 if (!recoverable_mmap_error(err)) { 2361 warn_fail_commit_memory(addr, bytes, exec, err); 2362 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "committing reserved memory."); 2363 } 2364 2365 return err; 2366} 2367 2368bool os::pd_commit_memory(char* addr, size_t bytes, bool exec) { 2369 return Solaris::commit_memory_impl(addr, bytes, exec) == 0; 2370} 2371 2372void os::pd_commit_memory_or_exit(char* addr, size_t bytes, bool exec, 2373 const char* mesg) { 2374 assert(mesg != NULL, "mesg must be specified"); 2375 int err = os::Solaris::commit_memory_impl(addr, bytes, exec); 2376 if (err != 0) { 2377 // the caller wants all commit errors to exit with the specified mesg: 2378 warn_fail_commit_memory(addr, bytes, exec, err); 2379 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg); 2380 } 2381} 2382 2383size_t os::Solaris::page_size_for_alignment(size_t alignment) { 2384 assert(is_size_aligned(alignment, (size_t) vm_page_size()), 2385 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, 2386 alignment, (size_t) vm_page_size()); 2387 2388 for (int i = 0; _page_sizes[i] != 0; i++) { 2389 if (is_size_aligned(alignment, _page_sizes[i])) { 2390 return _page_sizes[i]; 2391 } 2392 } 2393 2394 return (size_t) vm_page_size(); 2395} 2396 2397int os::Solaris::commit_memory_impl(char* addr, size_t bytes, 2398 size_t alignment_hint, bool exec) { 2399 int err = Solaris::commit_memory_impl(addr, bytes, exec); 2400 if (err == 0 && UseLargePages && alignment_hint > 0) { 2401 assert(is_size_aligned(bytes, alignment_hint), 2402 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, alignment_hint); 2403 2404 // The syscall memcntl requires an exact page size (see man memcntl for details). 2405 size_t page_size = page_size_for_alignment(alignment_hint); 2406 if (page_size > (size_t) vm_page_size()) { 2407 (void)Solaris::setup_large_pages(addr, bytes, page_size); 2408 } 2409 } 2410 return err; 2411} 2412 2413bool os::pd_commit_memory(char* addr, size_t bytes, size_t alignment_hint, 2414 bool exec) { 2415 return Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec) == 0; 2416} 2417 2418void os::pd_commit_memory_or_exit(char* addr, size_t bytes, 2419 size_t alignment_hint, bool exec, 2420 const char* mesg) { 2421 assert(mesg != NULL, "mesg must be specified"); 2422 int err = os::Solaris::commit_memory_impl(addr, bytes, alignment_hint, exec); 2423 if (err != 0) { 2424 // the caller wants all commit errors to exit with the specified mesg: 2425 warn_fail_commit_memory(addr, bytes, alignment_hint, exec, err); 2426 vm_exit_out_of_memory(bytes, OOM_MMAP_ERROR, "%s", mesg); 2427 } 2428} 2429 2430// Uncommit the pages in a specified region. 2431void os::pd_free_memory(char* addr, size_t bytes, size_t alignment_hint) { 2432 if (madvise(addr, bytes, MADV_FREE) < 0) { 2433 debug_only(warning("MADV_FREE failed.")); 2434 return; 2435 } 2436} 2437 2438bool os::pd_create_stack_guard_pages(char* addr, size_t size) { 2439 return os::commit_memory(addr, size, !ExecMem); 2440} 2441 2442bool os::remove_stack_guard_pages(char* addr, size_t size) { 2443 return os::uncommit_memory(addr, size); 2444} 2445 2446// Change the page size in a given range. 2447void os::pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint) { 2448 assert((intptr_t)addr % alignment_hint == 0, "Address should be aligned."); 2449 assert((intptr_t)(addr + bytes) % alignment_hint == 0, "End should be aligned."); 2450 if (UseLargePages) { 2451 size_t page_size = Solaris::page_size_for_alignment(alignment_hint); 2452 if (page_size > (size_t) vm_page_size()) { 2453 Solaris::setup_large_pages(addr, bytes, page_size); 2454 } 2455 } 2456} 2457 2458// Tell the OS to make the range local to the first-touching LWP 2459void os::numa_make_local(char *addr, size_t bytes, int lgrp_hint) { 2460 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned."); 2461 if (madvise(addr, bytes, MADV_ACCESS_LWP) < 0) { 2462 debug_only(warning("MADV_ACCESS_LWP failed.")); 2463 } 2464} 2465 2466// Tell the OS that this range would be accessed from different LWPs. 2467void os::numa_make_global(char *addr, size_t bytes) { 2468 assert((intptr_t)addr % os::vm_page_size() == 0, "Address should be page-aligned."); 2469 if (madvise(addr, bytes, MADV_ACCESS_MANY) < 0) { 2470 debug_only(warning("MADV_ACCESS_MANY failed.")); 2471 } 2472} 2473 2474// Get the number of the locality groups. 2475size_t os::numa_get_groups_num() { 2476 size_t n = Solaris::lgrp_nlgrps(Solaris::lgrp_cookie()); 2477 return n != -1 ? n : 1; 2478} 2479 2480// Get a list of leaf locality groups. A leaf lgroup is group that 2481// doesn't have any children. Typical leaf group is a CPU or a CPU/memory 2482// board. An LWP is assigned to one of these groups upon creation. 2483size_t os::numa_get_leaf_groups(int *ids, size_t size) { 2484 if ((ids[0] = Solaris::lgrp_root(Solaris::lgrp_cookie())) == -1) { 2485 ids[0] = 0; 2486 return 1; 2487 } 2488 int result_size = 0, top = 1, bottom = 0, cur = 0; 2489 for (int k = 0; k < size; k++) { 2490 int r = Solaris::lgrp_children(Solaris::lgrp_cookie(), ids[cur], 2491 (Solaris::lgrp_id_t*)&ids[top], size - top); 2492 if (r == -1) { 2493 ids[0] = 0; 2494 return 1; 2495 } 2496 if (!r) { 2497 // That's a leaf node. 2498 assert(bottom <= cur, "Sanity check"); 2499 // Check if the node has memory 2500 if (Solaris::lgrp_resources(Solaris::lgrp_cookie(), ids[cur], 2501 NULL, 0, LGRP_RSRC_MEM) > 0) { 2502 ids[bottom++] = ids[cur]; 2503 } 2504 } 2505 top += r; 2506 cur++; 2507 } 2508 if (bottom == 0) { 2509 // Handle a situation, when the OS reports no memory available. 2510 // Assume UMA architecture. 2511 ids[0] = 0; 2512 return 1; 2513 } 2514 return bottom; 2515} 2516 2517// Detect the topology change. Typically happens during CPU plugging-unplugging. 2518bool os::numa_topology_changed() { 2519 int is_stale = Solaris::lgrp_cookie_stale(Solaris::lgrp_cookie()); 2520 if (is_stale != -1 && is_stale) { 2521 Solaris::lgrp_fini(Solaris::lgrp_cookie()); 2522 Solaris::lgrp_cookie_t c = Solaris::lgrp_init(Solaris::LGRP_VIEW_CALLER); 2523 assert(c != 0, "Failure to initialize LGRP API"); 2524 Solaris::set_lgrp_cookie(c); 2525 return true; 2526 } 2527 return false; 2528} 2529 2530// Get the group id of the current LWP. 2531int os::numa_get_group_id() { 2532 int lgrp_id = Solaris::lgrp_home(P_LWPID, P_MYID); 2533 if (lgrp_id == -1) { 2534 return 0; 2535 } 2536 const int size = os::numa_get_groups_num(); 2537 int *ids = (int*)alloca(size * sizeof(int)); 2538 2539 // Get the ids of all lgroups with memory; r is the count. 2540 int r = Solaris::lgrp_resources(Solaris::lgrp_cookie(), lgrp_id, 2541 (Solaris::lgrp_id_t*)ids, size, LGRP_RSRC_MEM); 2542 if (r <= 0) { 2543 return 0; 2544 } 2545 return ids[os::random() % r]; 2546} 2547 2548// Request information about the page. 2549bool os::get_page_info(char *start, page_info* info) { 2550 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE }; 2551 uint64_t addr = (uintptr_t)start; 2552 uint64_t outdata[2]; 2553 uint_t validity = 0; 2554 2555 if (os::Solaris::meminfo(&addr, 1, info_types, 2, outdata, &validity) < 0) { 2556 return false; 2557 } 2558 2559 info->size = 0; 2560 info->lgrp_id = -1; 2561 2562 if ((validity & 1) != 0) { 2563 if ((validity & 2) != 0) { 2564 info->lgrp_id = outdata[0]; 2565 } 2566 if ((validity & 4) != 0) { 2567 info->size = outdata[1]; 2568 } 2569 return true; 2570 } 2571 return false; 2572} 2573 2574// Scan the pages from start to end until a page different than 2575// the one described in the info parameter is encountered. 2576char *os::scan_pages(char *start, char* end, page_info* page_expected, 2577 page_info* page_found) { 2578 const uint_t info_types[] = { MEMINFO_VLGRP, MEMINFO_VPAGESIZE }; 2579 const size_t types = sizeof(info_types) / sizeof(info_types[0]); 2580 uint64_t addrs[MAX_MEMINFO_CNT], outdata[types * MAX_MEMINFO_CNT + 1]; 2581 uint_t validity[MAX_MEMINFO_CNT]; 2582 2583 size_t page_size = MAX2((size_t)os::vm_page_size(), page_expected->size); 2584 uint64_t p = (uint64_t)start; 2585 while (p < (uint64_t)end) { 2586 addrs[0] = p; 2587 size_t addrs_count = 1; 2588 while (addrs_count < MAX_MEMINFO_CNT && addrs[addrs_count - 1] + page_size < (uint64_t)end) { 2589 addrs[addrs_count] = addrs[addrs_count - 1] + page_size; 2590 addrs_count++; 2591 } 2592 2593 if (os::Solaris::meminfo(addrs, addrs_count, info_types, types, outdata, validity) < 0) { 2594 return NULL; 2595 } 2596 2597 size_t i = 0; 2598 for (; i < addrs_count; i++) { 2599 if ((validity[i] & 1) != 0) { 2600 if ((validity[i] & 4) != 0) { 2601 if (outdata[types * i + 1] != page_expected->size) { 2602 break; 2603 } 2604 } else if (page_expected->size != 0) { 2605 break; 2606 } 2607 2608 if ((validity[i] & 2) != 0 && page_expected->lgrp_id > 0) { 2609 if (outdata[types * i] != page_expected->lgrp_id) { 2610 break; 2611 } 2612 } 2613 } else { 2614 return NULL; 2615 } 2616 } 2617 2618 if (i < addrs_count) { 2619 if ((validity[i] & 2) != 0) { 2620 page_found->lgrp_id = outdata[types * i]; 2621 } else { 2622 page_found->lgrp_id = -1; 2623 } 2624 if ((validity[i] & 4) != 0) { 2625 page_found->size = outdata[types * i + 1]; 2626 } else { 2627 page_found->size = 0; 2628 } 2629 return (char*)addrs[i]; 2630 } 2631 2632 p = addrs[addrs_count - 1] + page_size; 2633 } 2634 return end; 2635} 2636 2637bool os::pd_uncommit_memory(char* addr, size_t bytes) { 2638 size_t size = bytes; 2639 // Map uncommitted pages PROT_NONE so we fail early if we touch an 2640 // uncommitted page. Otherwise, the read/write might succeed if we 2641 // have enough swap space to back the physical page. 2642 return 2643 NULL != Solaris::mmap_chunk(addr, size, 2644 MAP_PRIVATE|MAP_FIXED|MAP_NORESERVE, 2645 PROT_NONE); 2646} 2647 2648char* os::Solaris::mmap_chunk(char *addr, size_t size, int flags, int prot) { 2649 char *b = (char *)mmap(addr, size, prot, flags, os::Solaris::_dev_zero_fd, 0); 2650 2651 if (b == MAP_FAILED) { 2652 return NULL; 2653 } 2654 return b; 2655} 2656 2657char* os::Solaris::anon_mmap(char* requested_addr, size_t bytes, 2658 size_t alignment_hint, bool fixed) { 2659 char* addr = requested_addr; 2660 int flags = MAP_PRIVATE | MAP_NORESERVE; 2661 2662 assert(!(fixed && (alignment_hint > 0)), 2663 "alignment hint meaningless with fixed mmap"); 2664 2665 if (fixed) { 2666 flags |= MAP_FIXED; 2667 } else if (has_map_align && (alignment_hint > (size_t) vm_page_size())) { 2668 flags |= MAP_ALIGN; 2669 addr = (char*) alignment_hint; 2670 } 2671 2672 // Map uncommitted pages PROT_NONE so we fail early if we touch an 2673 // uncommitted page. Otherwise, the read/write might succeed if we 2674 // have enough swap space to back the physical page. 2675 return mmap_chunk(addr, bytes, flags, PROT_NONE); 2676} 2677 2678char* os::pd_reserve_memory(size_t bytes, char* requested_addr, 2679 size_t alignment_hint) { 2680 char* addr = Solaris::anon_mmap(requested_addr, bytes, alignment_hint, 2681 (requested_addr != NULL)); 2682 2683 guarantee(requested_addr == NULL || requested_addr == addr, 2684 "OS failed to return requested mmap address."); 2685 return addr; 2686} 2687 2688// Reserve memory at an arbitrary address, only if that area is 2689// available (and not reserved for something else). 2690 2691char* os::pd_attempt_reserve_memory_at(size_t bytes, char* requested_addr) { 2692 const int max_tries = 10; 2693 char* base[max_tries]; 2694 size_t size[max_tries]; 2695 2696 // Solaris adds a gap between mmap'ed regions. The size of the gap 2697 // is dependent on the requested size and the MMU. Our initial gap 2698 // value here is just a guess and will be corrected later. 2699 bool had_top_overlap = false; 2700 bool have_adjusted_gap = false; 2701 size_t gap = 0x400000; 2702 2703 // Assert only that the size is a multiple of the page size, since 2704 // that's all that mmap requires, and since that's all we really know 2705 // about at this low abstraction level. If we need higher alignment, 2706 // we can either pass an alignment to this method or verify alignment 2707 // in one of the methods further up the call chain. See bug 5044738. 2708 assert(bytes % os::vm_page_size() == 0, "reserving unexpected size block"); 2709 2710 // Since snv_84, Solaris attempts to honor the address hint - see 5003415. 2711 // Give it a try, if the kernel honors the hint we can return immediately. 2712 char* addr = Solaris::anon_mmap(requested_addr, bytes, 0, false); 2713 2714 volatile int err = errno; 2715 if (addr == requested_addr) { 2716 return addr; 2717 } else if (addr != NULL) { 2718 pd_unmap_memory(addr, bytes); 2719 } 2720 2721 if (PrintMiscellaneous && Verbose) { 2722 char buf[256]; 2723 buf[0] = '\0'; 2724 if (addr == NULL) { 2725 jio_snprintf(buf, sizeof(buf), ": %s", strerror(err)); 2726 } 2727 warning("attempt_reserve_memory_at: couldn't reserve " SIZE_FORMAT " bytes at " 2728 PTR_FORMAT ": reserve_memory_helper returned " PTR_FORMAT 2729 "%s", bytes, requested_addr, addr, buf); 2730 } 2731 2732 // Address hint method didn't work. Fall back to the old method. 2733 // In theory, once SNV becomes our oldest supported platform, this 2734 // code will no longer be needed. 2735 // 2736 // Repeatedly allocate blocks until the block is allocated at the 2737 // right spot. Give up after max_tries. 2738 int i; 2739 for (i = 0; i < max_tries; ++i) { 2740 base[i] = reserve_memory(bytes); 2741 2742 if (base[i] != NULL) { 2743 // Is this the block we wanted? 2744 if (base[i] == requested_addr) { 2745 size[i] = bytes; 2746 break; 2747 } 2748 2749 // check that the gap value is right 2750 if (had_top_overlap && !have_adjusted_gap) { 2751 size_t actual_gap = base[i-1] - base[i] - bytes; 2752 if (gap != actual_gap) { 2753 // adjust the gap value and retry the last 2 allocations 2754 assert(i > 0, "gap adjustment code problem"); 2755 have_adjusted_gap = true; // adjust the gap only once, just in case 2756 gap = actual_gap; 2757 if (PrintMiscellaneous && Verbose) { 2758 warning("attempt_reserve_memory_at: adjusted gap to 0x%lx", gap); 2759 } 2760 unmap_memory(base[i], bytes); 2761 unmap_memory(base[i-1], size[i-1]); 2762 i-=2; 2763 continue; 2764 } 2765 } 2766 2767 // Does this overlap the block we wanted? Give back the overlapped 2768 // parts and try again. 2769 // 2770 // There is still a bug in this code: if top_overlap == bytes, 2771 // the overlap is offset from requested region by the value of gap. 2772 // In this case giving back the overlapped part will not work, 2773 // because we'll give back the entire block at base[i] and 2774 // therefore the subsequent allocation will not generate a new gap. 2775 // This could be fixed with a new algorithm that used larger 2776 // or variable size chunks to find the requested region - 2777 // but such a change would introduce additional complications. 2778 // It's rare enough that the planets align for this bug, 2779 // so we'll just wait for a fix for 6204603/5003415 which 2780 // will provide a mmap flag to allow us to avoid this business. 2781 2782 size_t top_overlap = requested_addr + (bytes + gap) - base[i]; 2783 if (top_overlap >= 0 && top_overlap < bytes) { 2784 had_top_overlap = true; 2785 unmap_memory(base[i], top_overlap); 2786 base[i] += top_overlap; 2787 size[i] = bytes - top_overlap; 2788 } else { 2789 size_t bottom_overlap = base[i] + bytes - requested_addr; 2790 if (bottom_overlap >= 0 && bottom_overlap < bytes) { 2791 if (PrintMiscellaneous && Verbose && bottom_overlap == 0) { 2792 warning("attempt_reserve_memory_at: possible alignment bug"); 2793 } 2794 unmap_memory(requested_addr, bottom_overlap); 2795 size[i] = bytes - bottom_overlap; 2796 } else { 2797 size[i] = bytes; 2798 } 2799 } 2800 } 2801 } 2802 2803 // Give back the unused reserved pieces. 2804 2805 for (int j = 0; j < i; ++j) { 2806 if (base[j] != NULL) { 2807 unmap_memory(base[j], size[j]); 2808 } 2809 } 2810 2811 return (i < max_tries) ? requested_addr : NULL; 2812} 2813 2814bool os::pd_release_memory(char* addr, size_t bytes) { 2815 size_t size = bytes; 2816 return munmap(addr, size) == 0; 2817} 2818 2819static bool solaris_mprotect(char* addr, size_t bytes, int prot) { 2820 assert(addr == (char*)align_size_down((uintptr_t)addr, os::vm_page_size()), 2821 "addr must be page aligned"); 2822 int retVal = mprotect(addr, bytes, prot); 2823 return retVal == 0; 2824} 2825 2826// Protect memory (Used to pass readonly pages through 2827// JNI GetArray<type>Elements with empty arrays.) 2828// Also, used for serialization page and for compressed oops null pointer 2829// checking. 2830bool os::protect_memory(char* addr, size_t bytes, ProtType prot, 2831 bool is_committed) { 2832 unsigned int p = 0; 2833 switch (prot) { 2834 case MEM_PROT_NONE: p = PROT_NONE; break; 2835 case MEM_PROT_READ: p = PROT_READ; break; 2836 case MEM_PROT_RW: p = PROT_READ|PROT_WRITE; break; 2837 case MEM_PROT_RWX: p = PROT_READ|PROT_WRITE|PROT_EXEC; break; 2838 default: 2839 ShouldNotReachHere(); 2840 } 2841 // is_committed is unused. 2842 return solaris_mprotect(addr, bytes, p); 2843} 2844 2845// guard_memory and unguard_memory only happens within stack guard pages. 2846// Since ISM pertains only to the heap, guard and unguard memory should not 2847/// happen with an ISM region. 2848bool os::guard_memory(char* addr, size_t bytes) { 2849 return solaris_mprotect(addr, bytes, PROT_NONE); 2850} 2851 2852bool os::unguard_memory(char* addr, size_t bytes) { 2853 return solaris_mprotect(addr, bytes, PROT_READ|PROT_WRITE); 2854} 2855 2856// Large page support 2857static size_t _large_page_size = 0; 2858 2859// Insertion sort for small arrays (descending order). 2860static void insertion_sort_descending(size_t* array, int len) { 2861 for (int i = 0; i < len; i++) { 2862 size_t val = array[i]; 2863 for (size_t key = i; key > 0 && array[key - 1] < val; --key) { 2864 size_t tmp = array[key]; 2865 array[key] = array[key - 1]; 2866 array[key - 1] = tmp; 2867 } 2868 } 2869} 2870 2871bool os::Solaris::mpss_sanity_check(bool warn, size_t* page_size) { 2872 const unsigned int usable_count = VM_Version::page_size_count(); 2873 if (usable_count == 1) { 2874 return false; 2875 } 2876 2877 // Find the right getpagesizes interface. When solaris 11 is the minimum 2878 // build platform, getpagesizes() (without the '2') can be called directly. 2879 typedef int (*gps_t)(size_t[], int); 2880 gps_t gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes2")); 2881 if (gps_func == NULL) { 2882 gps_func = CAST_TO_FN_PTR(gps_t, dlsym(RTLD_DEFAULT, "getpagesizes")); 2883 if (gps_func == NULL) { 2884 if (warn) { 2885 warning("MPSS is not supported by the operating system."); 2886 } 2887 return false; 2888 } 2889 } 2890 2891 // Fill the array of page sizes. 2892 int n = (*gps_func)(_page_sizes, page_sizes_max); 2893 assert(n > 0, "Solaris bug?"); 2894 2895 if (n == page_sizes_max) { 2896 // Add a sentinel value (necessary only if the array was completely filled 2897 // since it is static (zeroed at initialization)). 2898 _page_sizes[--n] = 0; 2899 DEBUG_ONLY(warning("increase the size of the os::_page_sizes array.");) 2900 } 2901 assert(_page_sizes[n] == 0, "missing sentinel"); 2902 trace_page_sizes("available page sizes", _page_sizes, n); 2903 2904 if (n == 1) return false; // Only one page size available. 2905 2906 // Skip sizes larger than 4M (or LargePageSizeInBytes if it was set) and 2907 // select up to usable_count elements. First sort the array, find the first 2908 // acceptable value, then copy the usable sizes to the top of the array and 2909 // trim the rest. Make sure to include the default page size :-). 2910 // 2911 // A better policy could get rid of the 4M limit by taking the sizes of the 2912 // important VM memory regions (java heap and possibly the code cache) into 2913 // account. 2914 insertion_sort_descending(_page_sizes, n); 2915 const size_t size_limit = 2916 FLAG_IS_DEFAULT(LargePageSizeInBytes) ? 4 * M : LargePageSizeInBytes; 2917 int beg; 2918 for (beg = 0; beg < n && _page_sizes[beg] > size_limit; ++beg) /* empty */; 2919 const int end = MIN2((int)usable_count, n) - 1; 2920 for (int cur = 0; cur < end; ++cur, ++beg) { 2921 _page_sizes[cur] = _page_sizes[beg]; 2922 } 2923 _page_sizes[end] = vm_page_size(); 2924 _page_sizes[end + 1] = 0; 2925 2926 if (_page_sizes[end] > _page_sizes[end - 1]) { 2927 // Default page size is not the smallest; sort again. 2928 insertion_sort_descending(_page_sizes, end + 1); 2929 } 2930 *page_size = _page_sizes[0]; 2931 2932 trace_page_sizes("usable page sizes", _page_sizes, end + 1); 2933 return true; 2934} 2935 2936void os::large_page_init() { 2937 if (UseLargePages) { 2938 // print a warning if any large page related flag is specified on command line 2939 bool warn_on_failure = !FLAG_IS_DEFAULT(UseLargePages) || 2940 !FLAG_IS_DEFAULT(LargePageSizeInBytes); 2941 2942 UseLargePages = Solaris::mpss_sanity_check(warn_on_failure, &_large_page_size); 2943 } 2944} 2945 2946bool os::Solaris::is_valid_page_size(size_t bytes) { 2947 for (int i = 0; _page_sizes[i] != 0; i++) { 2948 if (_page_sizes[i] == bytes) { 2949 return true; 2950 } 2951 } 2952 return false; 2953} 2954 2955bool os::Solaris::setup_large_pages(caddr_t start, size_t bytes, size_t align) { 2956 assert(is_valid_page_size(align), SIZE_FORMAT " is not a valid page size", align); 2957 assert(is_ptr_aligned((void*) start, align), 2958 PTR_FORMAT " is not aligned to " SIZE_FORMAT, p2i((void*) start), align); 2959 assert(is_size_aligned(bytes, align), 2960 SIZE_FORMAT " is not aligned to " SIZE_FORMAT, bytes, align); 2961 2962 // Signal to OS that we want large pages for addresses 2963 // from addr, addr + bytes 2964 struct memcntl_mha mpss_struct; 2965 mpss_struct.mha_cmd = MHA_MAPSIZE_VA; 2966 mpss_struct.mha_pagesize = align; 2967 mpss_struct.mha_flags = 0; 2968 // Upon successful completion, memcntl() returns 0 2969 if (memcntl(start, bytes, MC_HAT_ADVISE, (caddr_t) &mpss_struct, 0, 0)) { 2970 debug_only(warning("Attempt to use MPSS failed.")); 2971 return false; 2972 } 2973 return true; 2974} 2975 2976char* os::reserve_memory_special(size_t size, size_t alignment, char* addr, bool exec) { 2977 fatal("os::reserve_memory_special should not be called on Solaris."); 2978 return NULL; 2979} 2980 2981bool os::release_memory_special(char* base, size_t bytes) { 2982 fatal("os::release_memory_special should not be called on Solaris."); 2983 return false; 2984} 2985 2986size_t os::large_page_size() { 2987 return _large_page_size; 2988} 2989 2990// MPSS allows application to commit large page memory on demand; with ISM 2991// the entire memory region must be allocated as shared memory. 2992bool os::can_commit_large_page_memory() { 2993 return true; 2994} 2995 2996bool os::can_execute_large_page_memory() { 2997 return true; 2998} 2999 3000// Read calls from inside the vm need to perform state transitions 3001size_t os::read(int fd, void *buf, unsigned int nBytes) { 3002 size_t res; 3003 JavaThread* thread = (JavaThread*)Thread::current(); 3004 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm"); 3005 ThreadBlockInVM tbiv(thread); 3006 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res); 3007 return res; 3008} 3009 3010size_t os::read_at(int fd, void *buf, unsigned int nBytes, jlong offset) { 3011 size_t res; 3012 JavaThread* thread = (JavaThread*)Thread::current(); 3013 assert(thread->thread_state() == _thread_in_vm, "Assumed _thread_in_vm"); 3014 ThreadBlockInVM tbiv(thread); 3015 RESTARTABLE(::pread(fd, buf, (size_t) nBytes, offset), res); 3016 return res; 3017} 3018 3019size_t os::restartable_read(int fd, void *buf, unsigned int nBytes) { 3020 size_t res; 3021 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 3022 "Assumed _thread_in_native"); 3023 RESTARTABLE(::read(fd, buf, (size_t) nBytes), res); 3024 return res; 3025} 3026 3027void os::naked_short_sleep(jlong ms) { 3028 assert(ms < 1000, "Un-interruptable sleep, short time use only"); 3029 3030 // usleep is deprecated and removed from POSIX, in favour of nanosleep, but 3031 // Solaris requires -lrt for this. 3032 usleep((ms * 1000)); 3033 3034 return; 3035} 3036 3037// Sleep forever; naked call to OS-specific sleep; use with CAUTION 3038void os::infinite_sleep() { 3039 while (true) { // sleep forever ... 3040 ::sleep(100); // ... 100 seconds at a time 3041 } 3042} 3043 3044// Used to convert frequent JVM_Yield() to nops 3045bool os::dont_yield() { 3046 if (DontYieldALot) { 3047 static hrtime_t last_time = 0; 3048 hrtime_t diff = getTimeNanos() - last_time; 3049 3050 if (diff < DontYieldALotInterval * 1000000) { 3051 return true; 3052 } 3053 3054 last_time += diff; 3055 3056 return false; 3057 } else { 3058 return false; 3059 } 3060} 3061 3062// Note that yield semantics are defined by the scheduling class to which 3063// the thread currently belongs. Typically, yield will _not yield to 3064// other equal or higher priority threads that reside on the dispatch queues 3065// of other CPUs. 3066 3067void os::naked_yield() { 3068 thr_yield(); 3069} 3070 3071// Interface for setting lwp priorities. If we are using T2 libthread, 3072// which forces the use of BoundThreads or we manually set UseBoundThreads, 3073// all of our threads will be assigned to real lwp's. Using the thr_setprio 3074// function is meaningless in this mode so we must adjust the real lwp's priority 3075// The routines below implement the getting and setting of lwp priorities. 3076// 3077// Note: T2 is now the only supported libthread. UseBoundThreads flag is 3078// being deprecated and all threads are now BoundThreads 3079// 3080// Note: There are three priority scales used on Solaris. Java priotities 3081// which range from 1 to 10, libthread "thr_setprio" scale which range 3082// from 0 to 127, and the current scheduling class of the process we 3083// are running in. This is typically from -60 to +60. 3084// The setting of the lwp priorities in done after a call to thr_setprio 3085// so Java priorities are mapped to libthread priorities and we map from 3086// the latter to lwp priorities. We don't keep priorities stored in 3087// Java priorities since some of our worker threads want to set priorities 3088// higher than all Java threads. 3089// 3090// For related information: 3091// (1) man -s 2 priocntl 3092// (2) man -s 4 priocntl 3093// (3) man dispadmin 3094// = librt.so 3095// = libthread/common/rtsched.c - thrp_setlwpprio(). 3096// = ps -cL <pid> ... to validate priority. 3097// = sched_get_priority_min and _max 3098// pthread_create 3099// sched_setparam 3100// pthread_setschedparam 3101// 3102// Assumptions: 3103// + We assume that all threads in the process belong to the same 3104// scheduling class. IE. an homogenous process. 3105// + Must be root or in IA group to change change "interactive" attribute. 3106// Priocntl() will fail silently. The only indication of failure is when 3107// we read-back the value and notice that it hasn't changed. 3108// + Interactive threads enter the runq at the head, non-interactive at the tail. 3109// + For RT, change timeslice as well. Invariant: 3110// constant "priority integral" 3111// Konst == TimeSlice * (60-Priority) 3112// Given a priority, compute appropriate timeslice. 3113// + Higher numerical values have higher priority. 3114 3115// sched class attributes 3116typedef struct { 3117 int schedPolicy; // classID 3118 int maxPrio; 3119 int minPrio; 3120} SchedInfo; 3121 3122 3123static SchedInfo tsLimits, iaLimits, rtLimits, fxLimits; 3124 3125#ifdef ASSERT 3126static int ReadBackValidate = 1; 3127#endif 3128static int myClass = 0; 3129static int myMin = 0; 3130static int myMax = 0; 3131static int myCur = 0; 3132static bool priocntl_enable = false; 3133 3134static const int criticalPrio = FXCriticalPriority; 3135static int java_MaxPriority_to_os_priority = 0; // Saved mapping 3136 3137 3138// lwp_priocntl_init 3139// 3140// Try to determine the priority scale for our process. 3141// 3142// Return errno or 0 if OK. 3143// 3144static int lwp_priocntl_init() { 3145 int rslt; 3146 pcinfo_t ClassInfo; 3147 pcparms_t ParmInfo; 3148 int i; 3149 3150 if (!UseThreadPriorities) return 0; 3151 3152 // If ThreadPriorityPolicy is 1, switch tables 3153 if (ThreadPriorityPolicy == 1) { 3154 for (i = 0; i < CriticalPriority+1; i++) 3155 os::java_to_os_priority[i] = prio_policy1[i]; 3156 } 3157 if (UseCriticalJavaThreadPriority) { 3158 // MaxPriority always maps to the FX scheduling class and criticalPrio. 3159 // See set_native_priority() and set_lwp_class_and_priority(). 3160 // Save original MaxPriority mapping in case attempt to 3161 // use critical priority fails. 3162 java_MaxPriority_to_os_priority = os::java_to_os_priority[MaxPriority]; 3163 // Set negative to distinguish from other priorities 3164 os::java_to_os_priority[MaxPriority] = -criticalPrio; 3165 } 3166 3167 // Get IDs for a set of well-known scheduling classes. 3168 // TODO-FIXME: GETCLINFO returns the current # of classes in the 3169 // the system. We should have a loop that iterates over the 3170 // classID values, which are known to be "small" integers. 3171 3172 strcpy(ClassInfo.pc_clname, "TS"); 3173 ClassInfo.pc_cid = -1; 3174 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3175 if (rslt < 0) return errno; 3176 assert(ClassInfo.pc_cid != -1, "cid for TS class is -1"); 3177 tsLimits.schedPolicy = ClassInfo.pc_cid; 3178 tsLimits.maxPrio = ((tsinfo_t*)ClassInfo.pc_clinfo)->ts_maxupri; 3179 tsLimits.minPrio = -tsLimits.maxPrio; 3180 3181 strcpy(ClassInfo.pc_clname, "IA"); 3182 ClassInfo.pc_cid = -1; 3183 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3184 if (rslt < 0) return errno; 3185 assert(ClassInfo.pc_cid != -1, "cid for IA class is -1"); 3186 iaLimits.schedPolicy = ClassInfo.pc_cid; 3187 iaLimits.maxPrio = ((iainfo_t*)ClassInfo.pc_clinfo)->ia_maxupri; 3188 iaLimits.minPrio = -iaLimits.maxPrio; 3189 3190 strcpy(ClassInfo.pc_clname, "RT"); 3191 ClassInfo.pc_cid = -1; 3192 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3193 if (rslt < 0) return errno; 3194 assert(ClassInfo.pc_cid != -1, "cid for RT class is -1"); 3195 rtLimits.schedPolicy = ClassInfo.pc_cid; 3196 rtLimits.maxPrio = ((rtinfo_t*)ClassInfo.pc_clinfo)->rt_maxpri; 3197 rtLimits.minPrio = 0; 3198 3199 strcpy(ClassInfo.pc_clname, "FX"); 3200 ClassInfo.pc_cid = -1; 3201 rslt = priocntl(P_ALL, 0, PC_GETCID, (caddr_t)&ClassInfo); 3202 if (rslt < 0) return errno; 3203 assert(ClassInfo.pc_cid != -1, "cid for FX class is -1"); 3204 fxLimits.schedPolicy = ClassInfo.pc_cid; 3205 fxLimits.maxPrio = ((fxinfo_t*)ClassInfo.pc_clinfo)->fx_maxupri; 3206 fxLimits.minPrio = 0; 3207 3208 // Query our "current" scheduling class. 3209 // This will normally be IA, TS or, rarely, FX or RT. 3210 memset(&ParmInfo, 0, sizeof(ParmInfo)); 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 myClass = ParmInfo.pc_cid; 3215 3216 // We now know our scheduling classId, get specific information 3217 // about the class. 3218 ClassInfo.pc_cid = myClass; 3219 ClassInfo.pc_clname[0] = 0; 3220 rslt = priocntl((idtype)0, 0, PC_GETCLINFO, (caddr_t)&ClassInfo); 3221 if (rslt < 0) return errno; 3222 3223 if (ThreadPriorityVerbose) { 3224 tty->print_cr("lwp_priocntl_init: Class=%d(%s)...", myClass, ClassInfo.pc_clname); 3225 } 3226 3227 memset(&ParmInfo, 0, sizeof(pcparms_t)); 3228 ParmInfo.pc_cid = PC_CLNULL; 3229 rslt = priocntl(P_PID, P_MYID, PC_GETPARMS, (caddr_t)&ParmInfo); 3230 if (rslt < 0) return errno; 3231 3232 if (ParmInfo.pc_cid == rtLimits.schedPolicy) { 3233 myMin = rtLimits.minPrio; 3234 myMax = rtLimits.maxPrio; 3235 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { 3236 iaparms_t *iaInfo = (iaparms_t*)ParmInfo.pc_clparms; 3237 myMin = iaLimits.minPrio; 3238 myMax = iaLimits.maxPrio; 3239 myMax = MIN2(myMax, (int)iaInfo->ia_uprilim); // clamp - restrict 3240 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { 3241 tsparms_t *tsInfo = (tsparms_t*)ParmInfo.pc_clparms; 3242 myMin = tsLimits.minPrio; 3243 myMax = tsLimits.maxPrio; 3244 myMax = MIN2(myMax, (int)tsInfo->ts_uprilim); // clamp - restrict 3245 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) { 3246 fxparms_t *fxInfo = (fxparms_t*)ParmInfo.pc_clparms; 3247 myMin = fxLimits.minPrio; 3248 myMax = fxLimits.maxPrio; 3249 myMax = MIN2(myMax, (int)fxInfo->fx_uprilim); // clamp - restrict 3250 } else { 3251 // No clue - punt 3252 if (ThreadPriorityVerbose) { 3253 tty->print_cr("Unknown scheduling class: %s ... \n", 3254 ClassInfo.pc_clname); 3255 } 3256 return EINVAL; // no clue, punt 3257 } 3258 3259 if (ThreadPriorityVerbose) { 3260 tty->print_cr("Thread priority Range: [%d..%d]\n", myMin, myMax); 3261 } 3262 3263 priocntl_enable = true; // Enable changing priorities 3264 return 0; 3265} 3266 3267#define IAPRI(x) ((iaparms_t *)((x).pc_clparms)) 3268#define RTPRI(x) ((rtparms_t *)((x).pc_clparms)) 3269#define TSPRI(x) ((tsparms_t *)((x).pc_clparms)) 3270#define FXPRI(x) ((fxparms_t *)((x).pc_clparms)) 3271 3272 3273// scale_to_lwp_priority 3274// 3275// Convert from the libthread "thr_setprio" scale to our current 3276// lwp scheduling class scale. 3277// 3278static int scale_to_lwp_priority(int rMin, int rMax, int x) { 3279 int v; 3280 3281 if (x == 127) return rMax; // avoid round-down 3282 v = (((x*(rMax-rMin)))/128)+rMin; 3283 return v; 3284} 3285 3286 3287// set_lwp_class_and_priority 3288int set_lwp_class_and_priority(int ThreadID, int lwpid, 3289 int newPrio, int new_class, bool scale) { 3290 int rslt; 3291 int Actual, Expected, prv; 3292 pcparms_t ParmInfo; // for GET-SET 3293#ifdef ASSERT 3294 pcparms_t ReadBack; // for readback 3295#endif 3296 3297 // Set priority via PC_GETPARMS, update, PC_SETPARMS 3298 // Query current values. 3299 // TODO: accelerate this by eliminating the PC_GETPARMS call. 3300 // Cache "pcparms_t" in global ParmCache. 3301 // TODO: elide set-to-same-value 3302 3303 // If something went wrong on init, don't change priorities. 3304 if (!priocntl_enable) { 3305 if (ThreadPriorityVerbose) { 3306 tty->print_cr("Trying to set priority but init failed, ignoring"); 3307 } 3308 return EINVAL; 3309 } 3310 3311 // If lwp hasn't started yet, just return 3312 // the _start routine will call us again. 3313 if (lwpid <= 0) { 3314 if (ThreadPriorityVerbose) { 3315 tty->print_cr("deferring the set_lwp_class_and_priority of thread " 3316 INTPTR_FORMAT " to %d, lwpid not set", 3317 ThreadID, newPrio); 3318 } 3319 return 0; 3320 } 3321 3322 if (ThreadPriorityVerbose) { 3323 tty->print_cr ("set_lwp_class_and_priority(" 3324 INTPTR_FORMAT "@" INTPTR_FORMAT " %d) ", 3325 ThreadID, lwpid, newPrio); 3326 } 3327 3328 memset(&ParmInfo, 0, sizeof(pcparms_t)); 3329 ParmInfo.pc_cid = PC_CLNULL; 3330 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ParmInfo); 3331 if (rslt < 0) return errno; 3332 3333 int cur_class = ParmInfo.pc_cid; 3334 ParmInfo.pc_cid = (id_t)new_class; 3335 3336 if (new_class == rtLimits.schedPolicy) { 3337 rtparms_t *rtInfo = (rtparms_t*)ParmInfo.pc_clparms; 3338 rtInfo->rt_pri = scale ? scale_to_lwp_priority(rtLimits.minPrio, 3339 rtLimits.maxPrio, newPrio) 3340 : newPrio; 3341 rtInfo->rt_tqsecs = RT_NOCHANGE; 3342 rtInfo->rt_tqnsecs = RT_NOCHANGE; 3343 if (ThreadPriorityVerbose) { 3344 tty->print_cr("RT: %d->%d\n", newPrio, rtInfo->rt_pri); 3345 } 3346 } else if (new_class == iaLimits.schedPolicy) { 3347 iaparms_t* iaInfo = (iaparms_t*)ParmInfo.pc_clparms; 3348 int maxClamped = MIN2(iaLimits.maxPrio, 3349 cur_class == new_class 3350 ? (int)iaInfo->ia_uprilim : iaLimits.maxPrio); 3351 iaInfo->ia_upri = scale ? scale_to_lwp_priority(iaLimits.minPrio, 3352 maxClamped, newPrio) 3353 : newPrio; 3354 iaInfo->ia_uprilim = cur_class == new_class 3355 ? IA_NOCHANGE : (pri_t)iaLimits.maxPrio; 3356 iaInfo->ia_mode = IA_NOCHANGE; 3357 if (ThreadPriorityVerbose) { 3358 tty->print_cr("IA: [%d...%d] %d->%d\n", 3359 iaLimits.minPrio, maxClamped, newPrio, iaInfo->ia_upri); 3360 } 3361 } else if (new_class == tsLimits.schedPolicy) { 3362 tsparms_t* tsInfo = (tsparms_t*)ParmInfo.pc_clparms; 3363 int maxClamped = MIN2(tsLimits.maxPrio, 3364 cur_class == new_class 3365 ? (int)tsInfo->ts_uprilim : tsLimits.maxPrio); 3366 tsInfo->ts_upri = scale ? scale_to_lwp_priority(tsLimits.minPrio, 3367 maxClamped, newPrio) 3368 : newPrio; 3369 tsInfo->ts_uprilim = cur_class == new_class 3370 ? TS_NOCHANGE : (pri_t)tsLimits.maxPrio; 3371 if (ThreadPriorityVerbose) { 3372 tty->print_cr("TS: [%d...%d] %d->%d\n", 3373 tsLimits.minPrio, maxClamped, newPrio, tsInfo->ts_upri); 3374 } 3375 } else if (new_class == fxLimits.schedPolicy) { 3376 fxparms_t* fxInfo = (fxparms_t*)ParmInfo.pc_clparms; 3377 int maxClamped = MIN2(fxLimits.maxPrio, 3378 cur_class == new_class 3379 ? (int)fxInfo->fx_uprilim : fxLimits.maxPrio); 3380 fxInfo->fx_upri = scale ? scale_to_lwp_priority(fxLimits.minPrio, 3381 maxClamped, newPrio) 3382 : newPrio; 3383 fxInfo->fx_uprilim = cur_class == new_class 3384 ? FX_NOCHANGE : (pri_t)fxLimits.maxPrio; 3385 fxInfo->fx_tqsecs = FX_NOCHANGE; 3386 fxInfo->fx_tqnsecs = FX_NOCHANGE; 3387 if (ThreadPriorityVerbose) { 3388 tty->print_cr("FX: [%d...%d] %d->%d\n", 3389 fxLimits.minPrio, maxClamped, newPrio, fxInfo->fx_upri); 3390 } 3391 } else { 3392 if (ThreadPriorityVerbose) { 3393 tty->print_cr("Unknown new scheduling class %d\n", new_class); 3394 } 3395 return EINVAL; // no clue, punt 3396 } 3397 3398 rslt = priocntl(P_LWPID, lwpid, PC_SETPARMS, (caddr_t)&ParmInfo); 3399 if (ThreadPriorityVerbose && rslt) { 3400 tty->print_cr ("PC_SETPARMS ->%d %d\n", rslt, errno); 3401 } 3402 if (rslt < 0) return errno; 3403 3404#ifdef ASSERT 3405 // Sanity check: read back what we just attempted to set. 3406 // In theory it could have changed in the interim ... 3407 // 3408 // The priocntl system call is tricky. 3409 // Sometimes it'll validate the priority value argument and 3410 // return EINVAL if unhappy. At other times it fails silently. 3411 // Readbacks are prudent. 3412 3413 if (!ReadBackValidate) return 0; 3414 3415 memset(&ReadBack, 0, sizeof(pcparms_t)); 3416 ReadBack.pc_cid = PC_CLNULL; 3417 rslt = priocntl(P_LWPID, lwpid, PC_GETPARMS, (caddr_t)&ReadBack); 3418 assert(rslt >= 0, "priocntl failed"); 3419 Actual = Expected = 0xBAD; 3420 assert(ParmInfo.pc_cid == ReadBack.pc_cid, "cid's don't match"); 3421 if (ParmInfo.pc_cid == rtLimits.schedPolicy) { 3422 Actual = RTPRI(ReadBack)->rt_pri; 3423 Expected = RTPRI(ParmInfo)->rt_pri; 3424 } else if (ParmInfo.pc_cid == iaLimits.schedPolicy) { 3425 Actual = IAPRI(ReadBack)->ia_upri; 3426 Expected = IAPRI(ParmInfo)->ia_upri; 3427 } else if (ParmInfo.pc_cid == tsLimits.schedPolicy) { 3428 Actual = TSPRI(ReadBack)->ts_upri; 3429 Expected = TSPRI(ParmInfo)->ts_upri; 3430 } else if (ParmInfo.pc_cid == fxLimits.schedPolicy) { 3431 Actual = FXPRI(ReadBack)->fx_upri; 3432 Expected = FXPRI(ParmInfo)->fx_upri; 3433 } else { 3434 if (ThreadPriorityVerbose) { 3435 tty->print_cr("set_lwp_class_and_priority: unexpected class in readback: %d\n", 3436 ParmInfo.pc_cid); 3437 } 3438 } 3439 3440 if (Actual != Expected) { 3441 if (ThreadPriorityVerbose) { 3442 tty->print_cr ("set_lwp_class_and_priority(%d %d) Class=%d: actual=%d vs expected=%d\n", 3443 lwpid, newPrio, ReadBack.pc_cid, Actual, Expected); 3444 } 3445 } 3446#endif 3447 3448 return 0; 3449} 3450 3451// Solaris only gives access to 128 real priorities at a time, 3452// so we expand Java's ten to fill this range. This would be better 3453// if we dynamically adjusted relative priorities. 3454// 3455// The ThreadPriorityPolicy option allows us to select 2 different 3456// priority scales. 3457// 3458// ThreadPriorityPolicy=0 3459// Since the Solaris' default priority is MaximumPriority, we do not 3460// set a priority lower than Max unless a priority lower than 3461// NormPriority is requested. 3462// 3463// ThreadPriorityPolicy=1 3464// This mode causes the priority table to get filled with 3465// linear values. NormPriority get's mapped to 50% of the 3466// Maximum priority an so on. This will cause VM threads 3467// to get unfair treatment against other Solaris processes 3468// which do not explicitly alter their thread priorities. 3469 3470int os::java_to_os_priority[CriticalPriority + 1] = { 3471 -99999, // 0 Entry should never be used 3472 3473 0, // 1 MinPriority 3474 32, // 2 3475 64, // 3 3476 3477 96, // 4 3478 127, // 5 NormPriority 3479 127, // 6 3480 3481 127, // 7 3482 127, // 8 3483 127, // 9 NearMaxPriority 3484 3485 127, // 10 MaxPriority 3486 3487 -criticalPrio // 11 CriticalPriority 3488}; 3489 3490OSReturn os::set_native_priority(Thread* thread, int newpri) { 3491 OSThread* osthread = thread->osthread(); 3492 3493 // Save requested priority in case the thread hasn't been started 3494 osthread->set_native_priority(newpri); 3495 3496 // Check for critical priority request 3497 bool fxcritical = false; 3498 if (newpri == -criticalPrio) { 3499 fxcritical = true; 3500 newpri = criticalPrio; 3501 } 3502 3503 assert(newpri >= MinimumPriority && newpri <= MaximumPriority, "bad priority mapping"); 3504 if (!UseThreadPriorities) return OS_OK; 3505 3506 int status = 0; 3507 3508 if (!fxcritical) { 3509 // Use thr_setprio only if we have a priority that thr_setprio understands 3510 status = thr_setprio(thread->osthread()->thread_id(), newpri); 3511 } 3512 3513 int lwp_status = 3514 set_lwp_class_and_priority(osthread->thread_id(), 3515 osthread->lwp_id(), 3516 newpri, 3517 fxcritical ? fxLimits.schedPolicy : myClass, 3518 !fxcritical); 3519 if (lwp_status != 0 && fxcritical) { 3520 // Try again, this time without changing the scheduling class 3521 newpri = java_MaxPriority_to_os_priority; 3522 lwp_status = set_lwp_class_and_priority(osthread->thread_id(), 3523 osthread->lwp_id(), 3524 newpri, myClass, false); 3525 } 3526 status |= lwp_status; 3527 return (status == 0) ? OS_OK : OS_ERR; 3528} 3529 3530 3531OSReturn os::get_native_priority(const Thread* const thread, 3532 int *priority_ptr) { 3533 int p; 3534 if (!UseThreadPriorities) { 3535 *priority_ptr = NormalPriority; 3536 return OS_OK; 3537 } 3538 int status = thr_getprio(thread->osthread()->thread_id(), &p); 3539 if (status != 0) { 3540 return OS_ERR; 3541 } 3542 *priority_ptr = p; 3543 return OS_OK; 3544} 3545 3546 3547// Hint to the underlying OS that a task switch would not be good. 3548// Void return because it's a hint and can fail. 3549void os::hint_no_preempt() { 3550 schedctl_start(schedctl_init()); 3551} 3552 3553static void resume_clear_context(OSThread *osthread) { 3554 osthread->set_ucontext(NULL); 3555} 3556 3557static void suspend_save_context(OSThread *osthread, ucontext_t* context) { 3558 osthread->set_ucontext(context); 3559} 3560 3561static PosixSemaphore sr_semaphore; 3562 3563void os::Solaris::SR_handler(Thread* thread, ucontext_t* uc) { 3564 // Save and restore errno to avoid confusing native code with EINTR 3565 // after sigsuspend. 3566 int old_errno = errno; 3567 3568 OSThread* osthread = thread->osthread(); 3569 assert(thread->is_VM_thread() || thread->is_Java_thread(), "Must be VMThread or JavaThread"); 3570 3571 os::SuspendResume::State current = osthread->sr.state(); 3572 if (current == os::SuspendResume::SR_SUSPEND_REQUEST) { 3573 suspend_save_context(osthread, uc); 3574 3575 // attempt to switch the state, we assume we had a SUSPEND_REQUEST 3576 os::SuspendResume::State state = osthread->sr.suspended(); 3577 if (state == os::SuspendResume::SR_SUSPENDED) { 3578 sigset_t suspend_set; // signals for sigsuspend() 3579 3580 // get current set of blocked signals and unblock resume signal 3581 thr_sigsetmask(SIG_BLOCK, NULL, &suspend_set); 3582 sigdelset(&suspend_set, os::Solaris::SIGasync()); 3583 3584 sr_semaphore.signal(); 3585 // wait here until we are resumed 3586 while (1) { 3587 sigsuspend(&suspend_set); 3588 3589 os::SuspendResume::State result = osthread->sr.running(); 3590 if (result == os::SuspendResume::SR_RUNNING) { 3591 sr_semaphore.signal(); 3592 break; 3593 } 3594 } 3595 3596 } else if (state == os::SuspendResume::SR_RUNNING) { 3597 // request was cancelled, continue 3598 } else { 3599 ShouldNotReachHere(); 3600 } 3601 3602 resume_clear_context(osthread); 3603 } else if (current == os::SuspendResume::SR_RUNNING) { 3604 // request was cancelled, continue 3605 } else if (current == os::SuspendResume::SR_WAKEUP_REQUEST) { 3606 // ignore 3607 } else { 3608 // ignore 3609 } 3610 3611 errno = old_errno; 3612} 3613 3614void os::print_statistics() { 3615} 3616 3617bool os::message_box(const char* title, const char* message) { 3618 int i; 3619 fdStream err(defaultStream::error_fd()); 3620 for (i = 0; i < 78; i++) err.print_raw("="); 3621 err.cr(); 3622 err.print_raw_cr(title); 3623 for (i = 0; i < 78; i++) err.print_raw("-"); 3624 err.cr(); 3625 err.print_raw_cr(message); 3626 for (i = 0; i < 78; i++) err.print_raw("="); 3627 err.cr(); 3628 3629 char buf[16]; 3630 // Prevent process from exiting upon "read error" without consuming all CPU 3631 while (::read(0, buf, sizeof(buf)) <= 0) { ::sleep(100); } 3632 3633 return buf[0] == 'y' || buf[0] == 'Y'; 3634} 3635 3636static int sr_notify(OSThread* osthread) { 3637 int status = thr_kill(osthread->thread_id(), os::Solaris::SIGasync()); 3638 assert_status(status == 0, status, "thr_kill"); 3639 return status; 3640} 3641 3642// "Randomly" selected value for how long we want to spin 3643// before bailing out on suspending a thread, also how often 3644// we send a signal to a thread we want to resume 3645static const int RANDOMLY_LARGE_INTEGER = 1000000; 3646static const int RANDOMLY_LARGE_INTEGER2 = 100; 3647 3648static bool do_suspend(OSThread* osthread) { 3649 assert(osthread->sr.is_running(), "thread should be running"); 3650 assert(!sr_semaphore.trywait(), "semaphore has invalid state"); 3651 3652 // mark as suspended and send signal 3653 if (osthread->sr.request_suspend() != os::SuspendResume::SR_SUSPEND_REQUEST) { 3654 // failed to switch, state wasn't running? 3655 ShouldNotReachHere(); 3656 return false; 3657 } 3658 3659 if (sr_notify(osthread) != 0) { 3660 ShouldNotReachHere(); 3661 } 3662 3663 // managed to send the signal and switch to SUSPEND_REQUEST, now wait for SUSPENDED 3664 while (true) { 3665 if (sr_semaphore.timedwait(0, 2000 * NANOSECS_PER_MILLISEC)) { 3666 break; 3667 } else { 3668 // timeout 3669 os::SuspendResume::State cancelled = osthread->sr.cancel_suspend(); 3670 if (cancelled == os::SuspendResume::SR_RUNNING) { 3671 return false; 3672 } else if (cancelled == os::SuspendResume::SR_SUSPENDED) { 3673 // make sure that we consume the signal on the semaphore as well 3674 sr_semaphore.wait(); 3675 break; 3676 } else { 3677 ShouldNotReachHere(); 3678 return false; 3679 } 3680 } 3681 } 3682 3683 guarantee(osthread->sr.is_suspended(), "Must be suspended"); 3684 return true; 3685} 3686 3687static void do_resume(OSThread* osthread) { 3688 assert(osthread->sr.is_suspended(), "thread should be suspended"); 3689 assert(!sr_semaphore.trywait(), "invalid semaphore state"); 3690 3691 if (osthread->sr.request_wakeup() != os::SuspendResume::SR_WAKEUP_REQUEST) { 3692 // failed to switch to WAKEUP_REQUEST 3693 ShouldNotReachHere(); 3694 return; 3695 } 3696 3697 while (true) { 3698 if (sr_notify(osthread) == 0) { 3699 if (sr_semaphore.timedwait(0, 2 * NANOSECS_PER_MILLISEC)) { 3700 if (osthread->sr.is_running()) { 3701 return; 3702 } 3703 } 3704 } else { 3705 ShouldNotReachHere(); 3706 } 3707 } 3708 3709 guarantee(osthread->sr.is_running(), "Must be running!"); 3710} 3711 3712void os::SuspendedThreadTask::internal_do_task() { 3713 if (do_suspend(_thread->osthread())) { 3714 SuspendedThreadTaskContext context(_thread, _thread->osthread()->ucontext()); 3715 do_task(context); 3716 do_resume(_thread->osthread()); 3717 } 3718} 3719 3720class PcFetcher : public os::SuspendedThreadTask { 3721 public: 3722 PcFetcher(Thread* thread) : os::SuspendedThreadTask(thread) {} 3723 ExtendedPC result(); 3724 protected: 3725 void do_task(const os::SuspendedThreadTaskContext& context); 3726 private: 3727 ExtendedPC _epc; 3728}; 3729 3730ExtendedPC PcFetcher::result() { 3731 guarantee(is_done(), "task is not done yet."); 3732 return _epc; 3733} 3734 3735void PcFetcher::do_task(const os::SuspendedThreadTaskContext& context) { 3736 Thread* thread = context.thread(); 3737 OSThread* osthread = thread->osthread(); 3738 if (osthread->ucontext() != NULL) { 3739 _epc = os::Solaris::ucontext_get_pc((ucontext_t *) context.ucontext()); 3740 } else { 3741 // NULL context is unexpected, double-check this is the VMThread 3742 guarantee(thread->is_VM_thread(), "can only be called for VMThread"); 3743 } 3744} 3745 3746// A lightweight implementation that does not suspend the target thread and 3747// thus returns only a hint. Used for profiling only! 3748ExtendedPC os::get_thread_pc(Thread* thread) { 3749 // Make sure that it is called by the watcher and the Threads lock is owned. 3750 assert(Thread::current()->is_Watcher_thread(), "Must be watcher and own Threads_lock"); 3751 // For now, is only used to profile the VM Thread 3752 assert(thread->is_VM_thread(), "Can only be called for VMThread"); 3753 PcFetcher fetcher(thread); 3754 fetcher.run(); 3755 return fetcher.result(); 3756} 3757 3758 3759// This does not do anything on Solaris. This is basically a hook for being 3760// able to use structured exception handling (thread-local exception filters) on, e.g., Win32. 3761void os::os_exception_wrapper(java_call_t f, JavaValue* value, 3762 const methodHandle& method, JavaCallArguments* args, 3763 Thread* thread) { 3764 f(value, method, args, thread); 3765} 3766 3767// This routine may be used by user applications as a "hook" to catch signals. 3768// The user-defined signal handler must pass unrecognized signals to this 3769// routine, and if it returns true (non-zero), then the signal handler must 3770// return immediately. If the flag "abort_if_unrecognized" is true, then this 3771// routine will never retun false (zero), but instead will execute a VM panic 3772// routine kill the process. 3773// 3774// If this routine returns false, it is OK to call it again. This allows 3775// the user-defined signal handler to perform checks either before or after 3776// the VM performs its own checks. Naturally, the user code would be making 3777// a serious error if it tried to handle an exception (such as a null check 3778// or breakpoint) that the VM was generating for its own correct operation. 3779// 3780// This routine may recognize any of the following kinds of signals: 3781// SIGBUS, SIGSEGV, SIGILL, SIGFPE, BREAK_SIGNAL, SIGPIPE, SIGXFSZ, 3782// os::Solaris::SIGasync 3783// It should be consulted by handlers for any of those signals. 3784// 3785// The caller of this routine must pass in the three arguments supplied 3786// to the function referred to in the "sa_sigaction" (not the "sa_handler") 3787// field of the structure passed to sigaction(). This routine assumes that 3788// the sa_flags field passed to sigaction() includes SA_SIGINFO and SA_RESTART. 3789// 3790// Note that the VM will print warnings if it detects conflicting signal 3791// handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers". 3792// 3793extern "C" JNIEXPORT int JVM_handle_solaris_signal(int signo, 3794 siginfo_t* siginfo, 3795 void* ucontext, 3796 int abort_if_unrecognized); 3797 3798 3799void signalHandler(int sig, siginfo_t* info, void* ucVoid) { 3800 int orig_errno = errno; // Preserve errno value over signal handler. 3801 JVM_handle_solaris_signal(sig, info, ucVoid, true); 3802 errno = orig_errno; 3803} 3804 3805// This boolean allows users to forward their own non-matching signals 3806// to JVM_handle_solaris_signal, harmlessly. 3807bool os::Solaris::signal_handlers_are_installed = false; 3808 3809// For signal-chaining 3810bool os::Solaris::libjsig_is_loaded = false; 3811typedef struct sigaction *(*get_signal_t)(int); 3812get_signal_t os::Solaris::get_signal_action = NULL; 3813 3814struct sigaction* os::Solaris::get_chained_signal_action(int sig) { 3815 struct sigaction *actp = NULL; 3816 3817 if ((libjsig_is_loaded) && (sig <= Maxlibjsigsigs)) { 3818 // Retrieve the old signal handler from libjsig 3819 actp = (*get_signal_action)(sig); 3820 } 3821 if (actp == NULL) { 3822 // Retrieve the preinstalled signal handler from jvm 3823 actp = get_preinstalled_handler(sig); 3824 } 3825 3826 return actp; 3827} 3828 3829static bool call_chained_handler(struct sigaction *actp, int sig, 3830 siginfo_t *siginfo, void *context) { 3831 // Call the old signal handler 3832 if (actp->sa_handler == SIG_DFL) { 3833 // It's more reasonable to let jvm treat it as an unexpected exception 3834 // instead of taking the default action. 3835 return false; 3836 } else if (actp->sa_handler != SIG_IGN) { 3837 if ((actp->sa_flags & SA_NODEFER) == 0) { 3838 // automaticlly block the signal 3839 sigaddset(&(actp->sa_mask), sig); 3840 } 3841 3842 sa_handler_t hand; 3843 sa_sigaction_t sa; 3844 bool siginfo_flag_set = (actp->sa_flags & SA_SIGINFO) != 0; 3845 // retrieve the chained handler 3846 if (siginfo_flag_set) { 3847 sa = actp->sa_sigaction; 3848 } else { 3849 hand = actp->sa_handler; 3850 } 3851 3852 if ((actp->sa_flags & SA_RESETHAND) != 0) { 3853 actp->sa_handler = SIG_DFL; 3854 } 3855 3856 // try to honor the signal mask 3857 sigset_t oset; 3858 thr_sigsetmask(SIG_SETMASK, &(actp->sa_mask), &oset); 3859 3860 // call into the chained handler 3861 if (siginfo_flag_set) { 3862 (*sa)(sig, siginfo, context); 3863 } else { 3864 (*hand)(sig); 3865 } 3866 3867 // restore the signal mask 3868 thr_sigsetmask(SIG_SETMASK, &oset, 0); 3869 } 3870 // Tell jvm's signal handler the signal is taken care of. 3871 return true; 3872} 3873 3874bool os::Solaris::chained_handler(int sig, siginfo_t* siginfo, void* context) { 3875 bool chained = false; 3876 // signal-chaining 3877 if (UseSignalChaining) { 3878 struct sigaction *actp = get_chained_signal_action(sig); 3879 if (actp != NULL) { 3880 chained = call_chained_handler(actp, sig, siginfo, context); 3881 } 3882 } 3883 return chained; 3884} 3885 3886struct sigaction* os::Solaris::get_preinstalled_handler(int sig) { 3887 assert((chainedsigactions != (struct sigaction *)NULL) && 3888 (preinstalled_sigs != (int *)NULL), "signals not yet initialized"); 3889 if (preinstalled_sigs[sig] != 0) { 3890 return &chainedsigactions[sig]; 3891 } 3892 return NULL; 3893} 3894 3895void os::Solaris::save_preinstalled_handler(int sig, 3896 struct sigaction& oldAct) { 3897 assert(sig > 0 && sig <= Maxsignum, "vm signal out of expected range"); 3898 assert((chainedsigactions != (struct sigaction *)NULL) && 3899 (preinstalled_sigs != (int *)NULL), "signals not yet initialized"); 3900 chainedsigactions[sig] = oldAct; 3901 preinstalled_sigs[sig] = 1; 3902} 3903 3904void os::Solaris::set_signal_handler(int sig, bool set_installed, 3905 bool oktochain) { 3906 // Check for overwrite. 3907 struct sigaction oldAct; 3908 sigaction(sig, (struct sigaction*)NULL, &oldAct); 3909 void* oldhand = 3910 oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3911 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3912 if (oldhand != CAST_FROM_FN_PTR(void*, SIG_DFL) && 3913 oldhand != CAST_FROM_FN_PTR(void*, SIG_IGN) && 3914 oldhand != CAST_FROM_FN_PTR(void*, signalHandler)) { 3915 if (AllowUserSignalHandlers || !set_installed) { 3916 // Do not overwrite; user takes responsibility to forward to us. 3917 return; 3918 } else if (UseSignalChaining) { 3919 if (oktochain) { 3920 // save the old handler in jvm 3921 save_preinstalled_handler(sig, oldAct); 3922 } else { 3923 vm_exit_during_initialization("Signal chaining not allowed for VM interrupt signal."); 3924 } 3925 // libjsig also interposes the sigaction() call below and saves the 3926 // old sigaction on it own. 3927 } else { 3928 fatal("Encountered unexpected pre-existing sigaction handler " 3929 "%#lx for signal %d.", (long)oldhand, sig); 3930 } 3931 } 3932 3933 struct sigaction sigAct; 3934 sigfillset(&(sigAct.sa_mask)); 3935 sigAct.sa_handler = SIG_DFL; 3936 3937 sigAct.sa_sigaction = signalHandler; 3938 // Handle SIGSEGV on alternate signal stack if 3939 // not using stack banging 3940 if (!UseStackBanging && sig == SIGSEGV) { 3941 sigAct.sa_flags = SA_SIGINFO | SA_RESTART | SA_ONSTACK; 3942 } else { 3943 sigAct.sa_flags = SA_SIGINFO | SA_RESTART; 3944 } 3945 os::Solaris::set_our_sigflags(sig, sigAct.sa_flags); 3946 3947 sigaction(sig, &sigAct, &oldAct); 3948 3949 void* oldhand2 = oldAct.sa_sigaction ? CAST_FROM_FN_PTR(void*, oldAct.sa_sigaction) 3950 : CAST_FROM_FN_PTR(void*, oldAct.sa_handler); 3951 assert(oldhand2 == oldhand, "no concurrent signal handler installation"); 3952} 3953 3954 3955#define DO_SIGNAL_CHECK(sig) \ 3956 do { \ 3957 if (!sigismember(&check_signal_done, sig)) { \ 3958 os::Solaris::check_signal_handler(sig); \ 3959 } \ 3960 } while (0) 3961 3962// This method is a periodic task to check for misbehaving JNI applications 3963// under CheckJNI, we can add any periodic checks here 3964 3965void os::run_periodic_checks() { 3966 // A big source of grief is hijacking virt. addr 0x0 on Solaris, 3967 // thereby preventing a NULL checks. 3968 if (!check_addr0_done) check_addr0_done = check_addr0(tty); 3969 3970 if (check_signals == false) return; 3971 3972 // SEGV and BUS if overridden could potentially prevent 3973 // generation of hs*.log in the event of a crash, debugging 3974 // such a case can be very challenging, so we absolutely 3975 // check for the following for a good measure: 3976 DO_SIGNAL_CHECK(SIGSEGV); 3977 DO_SIGNAL_CHECK(SIGILL); 3978 DO_SIGNAL_CHECK(SIGFPE); 3979 DO_SIGNAL_CHECK(SIGBUS); 3980 DO_SIGNAL_CHECK(SIGPIPE); 3981 DO_SIGNAL_CHECK(SIGXFSZ); 3982 3983 // ReduceSignalUsage allows the user to override these handlers 3984 // see comments at the very top and jvm_solaris.h 3985 if (!ReduceSignalUsage) { 3986 DO_SIGNAL_CHECK(SHUTDOWN1_SIGNAL); 3987 DO_SIGNAL_CHECK(SHUTDOWN2_SIGNAL); 3988 DO_SIGNAL_CHECK(SHUTDOWN3_SIGNAL); 3989 DO_SIGNAL_CHECK(BREAK_SIGNAL); 3990 } 3991 3992 // See comments above for using JVM1/JVM2 3993 DO_SIGNAL_CHECK(os::Solaris::SIGasync()); 3994 3995} 3996 3997typedef int (*os_sigaction_t)(int, const struct sigaction *, struct sigaction *); 3998 3999static os_sigaction_t os_sigaction = NULL; 4000 4001void os::Solaris::check_signal_handler(int sig) { 4002 char buf[O_BUFLEN]; 4003 address jvmHandler = NULL; 4004 4005 struct sigaction act; 4006 if (os_sigaction == NULL) { 4007 // only trust the default sigaction, in case it has been interposed 4008 os_sigaction = (os_sigaction_t)dlsym(RTLD_DEFAULT, "sigaction"); 4009 if (os_sigaction == NULL) return; 4010 } 4011 4012 os_sigaction(sig, (struct sigaction*)NULL, &act); 4013 4014 address thisHandler = (act.sa_flags & SA_SIGINFO) 4015 ? CAST_FROM_FN_PTR(address, act.sa_sigaction) 4016 : CAST_FROM_FN_PTR(address, act.sa_handler); 4017 4018 4019 switch (sig) { 4020 case SIGSEGV: 4021 case SIGBUS: 4022 case SIGFPE: 4023 case SIGPIPE: 4024 case SIGXFSZ: 4025 case SIGILL: 4026 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler); 4027 break; 4028 4029 case SHUTDOWN1_SIGNAL: 4030 case SHUTDOWN2_SIGNAL: 4031 case SHUTDOWN3_SIGNAL: 4032 case BREAK_SIGNAL: 4033 jvmHandler = (address)user_handler(); 4034 break; 4035 4036 default: 4037 int asynsig = os::Solaris::SIGasync(); 4038 4039 if (sig == asynsig) { 4040 jvmHandler = CAST_FROM_FN_PTR(address, signalHandler); 4041 } else { 4042 return; 4043 } 4044 break; 4045 } 4046 4047 4048 if (thisHandler != jvmHandler) { 4049 tty->print("Warning: %s handler ", exception_name(sig, buf, O_BUFLEN)); 4050 tty->print("expected:%s", get_signal_handler_name(jvmHandler, buf, O_BUFLEN)); 4051 tty->print_cr(" found:%s", get_signal_handler_name(thisHandler, buf, O_BUFLEN)); 4052 // No need to check this sig any longer 4053 sigaddset(&check_signal_done, sig); 4054 // Running under non-interactive shell, SHUTDOWN2_SIGNAL will be reassigned SIG_IGN 4055 if (sig == SHUTDOWN2_SIGNAL && !isatty(fileno(stdin))) { 4056 tty->print_cr("Running in non-interactive shell, %s handler is replaced by shell", 4057 exception_name(sig, buf, O_BUFLEN)); 4058 } 4059 } else if(os::Solaris::get_our_sigflags(sig) != 0 && act.sa_flags != os::Solaris::get_our_sigflags(sig)) { 4060 tty->print("Warning: %s handler flags ", exception_name(sig, buf, O_BUFLEN)); 4061 tty->print("expected:"); 4062 os::Posix::print_sa_flags(tty, os::Solaris::get_our_sigflags(sig)); 4063 tty->cr(); 4064 tty->print(" found:"); 4065 os::Posix::print_sa_flags(tty, act.sa_flags); 4066 tty->cr(); 4067 // No need to check this sig any longer 4068 sigaddset(&check_signal_done, sig); 4069 } 4070 4071 // Print all the signal handler state 4072 if (sigismember(&check_signal_done, sig)) { 4073 print_signal_handlers(tty, buf, O_BUFLEN); 4074 } 4075 4076} 4077 4078void os::Solaris::install_signal_handlers() { 4079 bool libjsigdone = false; 4080 signal_handlers_are_installed = true; 4081 4082 // signal-chaining 4083 typedef void (*signal_setting_t)(); 4084 signal_setting_t begin_signal_setting = NULL; 4085 signal_setting_t end_signal_setting = NULL; 4086 begin_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 4087 dlsym(RTLD_DEFAULT, "JVM_begin_signal_setting")); 4088 if (begin_signal_setting != NULL) { 4089 end_signal_setting = CAST_TO_FN_PTR(signal_setting_t, 4090 dlsym(RTLD_DEFAULT, "JVM_end_signal_setting")); 4091 get_signal_action = CAST_TO_FN_PTR(get_signal_t, 4092 dlsym(RTLD_DEFAULT, "JVM_get_signal_action")); 4093 get_libjsig_version = CAST_TO_FN_PTR(version_getting_t, 4094 dlsym(RTLD_DEFAULT, "JVM_get_libjsig_version")); 4095 libjsig_is_loaded = true; 4096 if (os::Solaris::get_libjsig_version != NULL) { 4097 libjsigversion = (*os::Solaris::get_libjsig_version)(); 4098 } 4099 assert(UseSignalChaining, "should enable signal-chaining"); 4100 } 4101 if (libjsig_is_loaded) { 4102 // Tell libjsig jvm is setting signal handlers 4103 (*begin_signal_setting)(); 4104 } 4105 4106 set_signal_handler(SIGSEGV, true, true); 4107 set_signal_handler(SIGPIPE, true, true); 4108 set_signal_handler(SIGXFSZ, true, true); 4109 set_signal_handler(SIGBUS, true, true); 4110 set_signal_handler(SIGILL, true, true); 4111 set_signal_handler(SIGFPE, true, true); 4112 4113 4114 if (os::Solaris::SIGasync() > OLDMAXSIGNUM) { 4115 // Pre-1.4.1 Libjsig limited to signal chaining signals <= 32 so 4116 // can not register overridable signals which might be > 32 4117 if (libjsig_is_loaded && libjsigversion <= JSIG_VERSION_1_4_1) { 4118 // Tell libjsig jvm has finished setting signal handlers 4119 (*end_signal_setting)(); 4120 libjsigdone = true; 4121 } 4122 } 4123 4124 set_signal_handler(os::Solaris::SIGasync(), true, true); 4125 4126 if (libjsig_is_loaded && !libjsigdone) { 4127 // Tell libjsig jvm finishes setting signal handlers 4128 (*end_signal_setting)(); 4129 } 4130 4131 // We don't activate signal checker if libjsig is in place, we trust ourselves 4132 // and if UserSignalHandler is installed all bets are off. 4133 // Log that signal checking is off only if -verbose:jni is specified. 4134 if (CheckJNICalls) { 4135 if (libjsig_is_loaded) { 4136 if (PrintJNIResolving) { 4137 tty->print_cr("Info: libjsig is activated, all active signal checking is disabled"); 4138 } 4139 check_signals = false; 4140 } 4141 if (AllowUserSignalHandlers) { 4142 if (PrintJNIResolving) { 4143 tty->print_cr("Info: AllowUserSignalHandlers is activated, all active signal checking is disabled"); 4144 } 4145 check_signals = false; 4146 } 4147 } 4148} 4149 4150 4151void report_error(const char* file_name, int line_no, const char* title, 4152 const char* format, ...); 4153 4154// (Static) wrapper for getisax(2) call. 4155os::Solaris::getisax_func_t os::Solaris::_getisax = 0; 4156 4157// (Static) wrappers for the liblgrp API 4158os::Solaris::lgrp_home_func_t os::Solaris::_lgrp_home; 4159os::Solaris::lgrp_init_func_t os::Solaris::_lgrp_init; 4160os::Solaris::lgrp_fini_func_t os::Solaris::_lgrp_fini; 4161os::Solaris::lgrp_root_func_t os::Solaris::_lgrp_root; 4162os::Solaris::lgrp_children_func_t os::Solaris::_lgrp_children; 4163os::Solaris::lgrp_resources_func_t os::Solaris::_lgrp_resources; 4164os::Solaris::lgrp_nlgrps_func_t os::Solaris::_lgrp_nlgrps; 4165os::Solaris::lgrp_cookie_stale_func_t os::Solaris::_lgrp_cookie_stale; 4166os::Solaris::lgrp_cookie_t os::Solaris::_lgrp_cookie = 0; 4167 4168// (Static) wrapper for meminfo() call. 4169os::Solaris::meminfo_func_t os::Solaris::_meminfo = 0; 4170 4171static address resolve_symbol_lazy(const char* name) { 4172 address addr = (address) dlsym(RTLD_DEFAULT, name); 4173 if (addr == NULL) { 4174 // RTLD_DEFAULT was not defined on some early versions of 2.5.1 4175 addr = (address) dlsym(RTLD_NEXT, name); 4176 } 4177 return addr; 4178} 4179 4180static address resolve_symbol(const char* name) { 4181 address addr = resolve_symbol_lazy(name); 4182 if (addr == NULL) { 4183 fatal(dlerror()); 4184 } 4185 return addr; 4186} 4187 4188void os::Solaris::libthread_init() { 4189 address func = (address)dlsym(RTLD_DEFAULT, "_thr_suspend_allmutators"); 4190 4191 lwp_priocntl_init(); 4192 4193 // RTLD_DEFAULT was not defined on some early versions of 5.5.1 4194 if (func == NULL) { 4195 func = (address) dlsym(RTLD_NEXT, "_thr_suspend_allmutators"); 4196 // Guarantee that this VM is running on an new enough OS (5.6 or 4197 // later) that it will have a new enough libthread.so. 4198 guarantee(func != NULL, "libthread.so is too old."); 4199 } 4200 4201 int size; 4202 void (*handler_info_func)(address *, int *); 4203 handler_info_func = CAST_TO_FN_PTR(void (*)(address *, int *), resolve_symbol("thr_sighndlrinfo")); 4204 handler_info_func(&handler_start, &size); 4205 handler_end = handler_start + size; 4206} 4207 4208 4209int_fnP_mutex_tP os::Solaris::_mutex_lock; 4210int_fnP_mutex_tP os::Solaris::_mutex_trylock; 4211int_fnP_mutex_tP os::Solaris::_mutex_unlock; 4212int_fnP_mutex_tP_i_vP os::Solaris::_mutex_init; 4213int_fnP_mutex_tP os::Solaris::_mutex_destroy; 4214int os::Solaris::_mutex_scope = USYNC_THREAD; 4215 4216int_fnP_cond_tP_mutex_tP_timestruc_tP os::Solaris::_cond_timedwait; 4217int_fnP_cond_tP_mutex_tP os::Solaris::_cond_wait; 4218int_fnP_cond_tP os::Solaris::_cond_signal; 4219int_fnP_cond_tP os::Solaris::_cond_broadcast; 4220int_fnP_cond_tP_i_vP os::Solaris::_cond_init; 4221int_fnP_cond_tP os::Solaris::_cond_destroy; 4222int os::Solaris::_cond_scope = USYNC_THREAD; 4223 4224void os::Solaris::synchronization_init() { 4225 if (UseLWPSynchronization) { 4226 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_lock"))); 4227 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_trylock"))); 4228 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("_lwp_mutex_unlock"))); 4229 os::Solaris::set_mutex_init(lwp_mutex_init); 4230 os::Solaris::set_mutex_destroy(lwp_mutex_destroy); 4231 os::Solaris::set_mutex_scope(USYNC_THREAD); 4232 4233 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("_lwp_cond_timedwait"))); 4234 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("_lwp_cond_wait"))); 4235 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_signal"))); 4236 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("_lwp_cond_broadcast"))); 4237 os::Solaris::set_cond_init(lwp_cond_init); 4238 os::Solaris::set_cond_destroy(lwp_cond_destroy); 4239 os::Solaris::set_cond_scope(USYNC_THREAD); 4240 } else { 4241 os::Solaris::set_mutex_scope(USYNC_THREAD); 4242 os::Solaris::set_cond_scope(USYNC_THREAD); 4243 4244 if (UsePthreads) { 4245 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_lock"))); 4246 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_trylock"))); 4247 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_unlock"))); 4248 os::Solaris::set_mutex_init(pthread_mutex_default_init); 4249 os::Solaris::set_mutex_destroy(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("pthread_mutex_destroy"))); 4250 4251 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("pthread_cond_timedwait"))); 4252 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("pthread_cond_wait"))); 4253 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_signal"))); 4254 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_broadcast"))); 4255 os::Solaris::set_cond_init(pthread_cond_default_init); 4256 os::Solaris::set_cond_destroy(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("pthread_cond_destroy"))); 4257 } else { 4258 os::Solaris::set_mutex_lock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_lock"))); 4259 os::Solaris::set_mutex_trylock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_trylock"))); 4260 os::Solaris::set_mutex_unlock(CAST_TO_FN_PTR(int_fnP_mutex_tP, resolve_symbol("mutex_unlock"))); 4261 os::Solaris::set_mutex_init(::mutex_init); 4262 os::Solaris::set_mutex_destroy(::mutex_destroy); 4263 4264 os::Solaris::set_cond_timedwait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP_timestruc_tP, resolve_symbol("cond_timedwait"))); 4265 os::Solaris::set_cond_wait(CAST_TO_FN_PTR(int_fnP_cond_tP_mutex_tP, resolve_symbol("cond_wait"))); 4266 os::Solaris::set_cond_signal(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_signal"))); 4267 os::Solaris::set_cond_broadcast(CAST_TO_FN_PTR(int_fnP_cond_tP, resolve_symbol("cond_broadcast"))); 4268 os::Solaris::set_cond_init(::cond_init); 4269 os::Solaris::set_cond_destroy(::cond_destroy); 4270 } 4271 } 4272} 4273 4274bool os::Solaris::liblgrp_init() { 4275 void *handle = dlopen("liblgrp.so.1", RTLD_LAZY); 4276 if (handle != NULL) { 4277 os::Solaris::set_lgrp_home(CAST_TO_FN_PTR(lgrp_home_func_t, dlsym(handle, "lgrp_home"))); 4278 os::Solaris::set_lgrp_init(CAST_TO_FN_PTR(lgrp_init_func_t, dlsym(handle, "lgrp_init"))); 4279 os::Solaris::set_lgrp_fini(CAST_TO_FN_PTR(lgrp_fini_func_t, dlsym(handle, "lgrp_fini"))); 4280 os::Solaris::set_lgrp_root(CAST_TO_FN_PTR(lgrp_root_func_t, dlsym(handle, "lgrp_root"))); 4281 os::Solaris::set_lgrp_children(CAST_TO_FN_PTR(lgrp_children_func_t, dlsym(handle, "lgrp_children"))); 4282 os::Solaris::set_lgrp_resources(CAST_TO_FN_PTR(lgrp_resources_func_t, dlsym(handle, "lgrp_resources"))); 4283 os::Solaris::set_lgrp_nlgrps(CAST_TO_FN_PTR(lgrp_nlgrps_func_t, dlsym(handle, "lgrp_nlgrps"))); 4284 os::Solaris::set_lgrp_cookie_stale(CAST_TO_FN_PTR(lgrp_cookie_stale_func_t, 4285 dlsym(handle, "lgrp_cookie_stale"))); 4286 4287 lgrp_cookie_t c = lgrp_init(LGRP_VIEW_CALLER); 4288 set_lgrp_cookie(c); 4289 return true; 4290 } 4291 return false; 4292} 4293 4294void os::Solaris::misc_sym_init() { 4295 address func; 4296 4297 // getisax 4298 func = resolve_symbol_lazy("getisax"); 4299 if (func != NULL) { 4300 os::Solaris::_getisax = CAST_TO_FN_PTR(getisax_func_t, func); 4301 } 4302 4303 // meminfo 4304 func = resolve_symbol_lazy("meminfo"); 4305 if (func != NULL) { 4306 os::Solaris::set_meminfo(CAST_TO_FN_PTR(meminfo_func_t, func)); 4307 } 4308} 4309 4310uint_t os::Solaris::getisax(uint32_t* array, uint_t n) { 4311 assert(_getisax != NULL, "_getisax not set"); 4312 return _getisax(array, n); 4313} 4314 4315// int pset_getloadavg(psetid_t pset, double loadavg[], int nelem); 4316typedef long (*pset_getloadavg_type)(psetid_t pset, double loadavg[], int nelem); 4317static pset_getloadavg_type pset_getloadavg_ptr = NULL; 4318 4319void init_pset_getloadavg_ptr(void) { 4320 pset_getloadavg_ptr = 4321 (pset_getloadavg_type)dlsym(RTLD_DEFAULT, "pset_getloadavg"); 4322 if (PrintMiscellaneous && Verbose && pset_getloadavg_ptr == NULL) { 4323 warning("pset_getloadavg function not found"); 4324 } 4325} 4326 4327int os::Solaris::_dev_zero_fd = -1; 4328 4329// this is called _before_ the global arguments have been parsed 4330void os::init(void) { 4331 _initial_pid = getpid(); 4332 4333 max_hrtime = first_hrtime = gethrtime(); 4334 4335 init_random(1234567); 4336 4337 page_size = sysconf(_SC_PAGESIZE); 4338 if (page_size == -1) { 4339 fatal("os_solaris.cpp: os::init: sysconf failed (%s)", strerror(errno)); 4340 } 4341 init_page_sizes((size_t) page_size); 4342 4343 Solaris::initialize_system_info(); 4344 4345 // Initialize misc. symbols as soon as possible, so we can use them 4346 // if we need them. 4347 Solaris::misc_sym_init(); 4348 4349 int fd = ::open("/dev/zero", O_RDWR); 4350 if (fd < 0) { 4351 fatal("os::init: cannot open /dev/zero (%s)", strerror(errno)); 4352 } else { 4353 Solaris::set_dev_zero_fd(fd); 4354 4355 // Close on exec, child won't inherit. 4356 fcntl(fd, F_SETFD, FD_CLOEXEC); 4357 } 4358 4359 clock_tics_per_sec = CLK_TCK; 4360 4361 // check if dladdr1() exists; dladdr1 can provide more information than 4362 // dladdr for os::dll_address_to_function_name. It comes with SunOS 5.9 4363 // and is available on linker patches for 5.7 and 5.8. 4364 // libdl.so must have been loaded, this call is just an entry lookup 4365 void * hdl = dlopen("libdl.so", RTLD_NOW); 4366 if (hdl) { 4367 dladdr1_func = CAST_TO_FN_PTR(dladdr1_func_type, dlsym(hdl, "dladdr1")); 4368 } 4369 4370 // (Solaris only) this switches to calls that actually do locking. 4371 ThreadCritical::initialize(); 4372 4373 main_thread = thr_self(); 4374 4375 // Constant minimum stack size allowed. It must be at least 4376 // the minimum of what the OS supports (thr_min_stack()), and 4377 // enough to allow the thread to get to user bytecode execution. 4378 Solaris::min_stack_allowed = MAX2(thr_min_stack(), Solaris::min_stack_allowed); 4379 // If the pagesize of the VM is greater than 8K determine the appropriate 4380 // number of initial guard pages. The user can change this with the 4381 // command line arguments, if needed. 4382 if (vm_page_size() > 8*K) { 4383 StackYellowPages = 1; 4384 StackRedPages = 1; 4385 StackShadowPages = round_to((StackShadowPages*8*K), vm_page_size()) / vm_page_size(); 4386 } 4387} 4388 4389// To install functions for atexit system call 4390extern "C" { 4391 static void perfMemory_exit_helper() { 4392 perfMemory_exit(); 4393 } 4394} 4395 4396// this is called _after_ the global arguments have been parsed 4397jint os::init_2(void) { 4398 // try to enable extended file IO ASAP, see 6431278 4399 os::Solaris::try_enable_extended_io(); 4400 4401 // Allocate a single page and mark it as readable for safepoint polling. Also 4402 // use this first mmap call to check support for MAP_ALIGN. 4403 address polling_page = (address)Solaris::mmap_chunk((char*)page_size, 4404 page_size, 4405 MAP_PRIVATE | MAP_ALIGN, 4406 PROT_READ); 4407 if (polling_page == NULL) { 4408 has_map_align = false; 4409 polling_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE, 4410 PROT_READ); 4411 } 4412 4413 os::set_polling_page(polling_page); 4414 4415#ifndef PRODUCT 4416 if (Verbose && PrintMiscellaneous) { 4417 tty->print("[SafePoint Polling address: " INTPTR_FORMAT "]\n", 4418 (intptr_t)polling_page); 4419 } 4420#endif 4421 4422 if (!UseMembar) { 4423 address mem_serialize_page = (address)Solaris::mmap_chunk(NULL, page_size, MAP_PRIVATE, PROT_READ | PROT_WRITE); 4424 guarantee(mem_serialize_page != NULL, "mmap Failed for memory serialize page"); 4425 os::set_memory_serialize_page(mem_serialize_page); 4426 4427#ifndef PRODUCT 4428 if (Verbose && PrintMiscellaneous) { 4429 tty->print("[Memory Serialize Page address: " INTPTR_FORMAT "]\n", 4430 (intptr_t)mem_serialize_page); 4431 } 4432#endif 4433 } 4434 4435 // Check minimum allowable stack size for thread creation and to initialize 4436 // the java system classes, including StackOverflowError - depends on page 4437 // size. Add a page for compiler2 recursion in main thread. 4438 // Add in 2*BytesPerWord times page size to account for VM stack during 4439 // class initialization depending on 32 or 64 bit VM. 4440 os::Solaris::min_stack_allowed = MAX2(os::Solaris::min_stack_allowed, 4441 (size_t)(StackYellowPages+StackRedPages+StackShadowPages+ 4442 2*BytesPerWord COMPILER2_PRESENT(+1)) * page_size); 4443 4444 size_t threadStackSizeInBytes = ThreadStackSize * K; 4445 if (threadStackSizeInBytes != 0 && 4446 threadStackSizeInBytes < os::Solaris::min_stack_allowed) { 4447 tty->print_cr("\nThe stack size specified is too small, Specify at least %dk", 4448 os::Solaris::min_stack_allowed/K); 4449 return JNI_ERR; 4450 } 4451 4452 // For 64kbps there will be a 64kb page size, which makes 4453 // the usable default stack size quite a bit less. Increase the 4454 // stack for 64kb (or any > than 8kb) pages, this increases 4455 // virtual memory fragmentation (since we're not creating the 4456 // stack on a power of 2 boundary. The real fix for this 4457 // should be to fix the guard page mechanism. 4458 4459 if (vm_page_size() > 8*K) { 4460 threadStackSizeInBytes = (threadStackSizeInBytes != 0) 4461 ? threadStackSizeInBytes + 4462 ((StackYellowPages + StackRedPages) * vm_page_size()) 4463 : 0; 4464 ThreadStackSize = threadStackSizeInBytes/K; 4465 } 4466 4467 // Make the stack size a multiple of the page size so that 4468 // the yellow/red zones can be guarded. 4469 JavaThread::set_stack_size_at_create(round_to(threadStackSizeInBytes, 4470 vm_page_size())); 4471 4472 Solaris::libthread_init(); 4473 4474 if (UseNUMA) { 4475 if (!Solaris::liblgrp_init()) { 4476 UseNUMA = false; 4477 } else { 4478 size_t lgrp_limit = os::numa_get_groups_num(); 4479 int *lgrp_ids = NEW_C_HEAP_ARRAY(int, lgrp_limit, mtInternal); 4480 size_t lgrp_num = os::numa_get_leaf_groups(lgrp_ids, lgrp_limit); 4481 FREE_C_HEAP_ARRAY(int, lgrp_ids); 4482 if (lgrp_num < 2) { 4483 // There's only one locality group, disable NUMA. 4484 UseNUMA = false; 4485 } 4486 } 4487 if (!UseNUMA && ForceNUMA) { 4488 UseNUMA = true; 4489 } 4490 } 4491 4492 Solaris::signal_sets_init(); 4493 Solaris::init_signal_mem(); 4494 Solaris::install_signal_handlers(); 4495 4496 if (libjsigversion < JSIG_VERSION_1_4_1) { 4497 Maxlibjsigsigs = OLDMAXSIGNUM; 4498 } 4499 4500 // initialize synchronization primitives to use either thread or 4501 // lwp synchronization (controlled by UseLWPSynchronization) 4502 Solaris::synchronization_init(); 4503 4504 if (MaxFDLimit) { 4505 // set the number of file descriptors to max. print out error 4506 // if getrlimit/setrlimit fails but continue regardless. 4507 struct rlimit nbr_files; 4508 int status = getrlimit(RLIMIT_NOFILE, &nbr_files); 4509 if (status != 0) { 4510 if (PrintMiscellaneous && (Verbose || WizardMode)) { 4511 perror("os::init_2 getrlimit failed"); 4512 } 4513 } else { 4514 nbr_files.rlim_cur = nbr_files.rlim_max; 4515 status = setrlimit(RLIMIT_NOFILE, &nbr_files); 4516 if (status != 0) { 4517 if (PrintMiscellaneous && (Verbose || WizardMode)) { 4518 perror("os::init_2 setrlimit failed"); 4519 } 4520 } 4521 } 4522 } 4523 4524 // Calculate theoretical max. size of Threads to guard gainst 4525 // artifical out-of-memory situations, where all available address- 4526 // space has been reserved by thread stacks. Default stack size is 1Mb. 4527 size_t pre_thread_stack_size = (JavaThread::stack_size_at_create()) ? 4528 JavaThread::stack_size_at_create() : (1*K*K); 4529 assert(pre_thread_stack_size != 0, "Must have a stack"); 4530 // Solaris has a maximum of 4Gb of user programs. Calculate the thread limit when 4531 // we should start doing Virtual Memory banging. Currently when the threads will 4532 // have used all but 200Mb of space. 4533 size_t max_address_space = ((unsigned int)4 * K * K * K) - (200 * K * K); 4534 Solaris::_os_thread_limit = max_address_space / pre_thread_stack_size; 4535 4536 // at-exit methods are called in the reverse order of their registration. 4537 // In Solaris 7 and earlier, atexit functions are called on return from 4538 // main or as a result of a call to exit(3C). There can be only 32 of 4539 // these functions registered and atexit() does not set errno. In Solaris 4540 // 8 and later, there is no limit to the number of functions registered 4541 // and atexit() sets errno. In addition, in Solaris 8 and later, atexit 4542 // functions are called upon dlclose(3DL) in addition to return from main 4543 // and exit(3C). 4544 4545 if (PerfAllowAtExitRegistration) { 4546 // only register atexit functions if PerfAllowAtExitRegistration is set. 4547 // atexit functions can be delayed until process exit time, which 4548 // can be problematic for embedded VM situations. Embedded VMs should 4549 // call DestroyJavaVM() to assure that VM resources are released. 4550 4551 // note: perfMemory_exit_helper atexit function may be removed in 4552 // the future if the appropriate cleanup code can be added to the 4553 // VM_Exit VMOperation's doit method. 4554 if (atexit(perfMemory_exit_helper) != 0) { 4555 warning("os::init2 atexit(perfMemory_exit_helper) failed"); 4556 } 4557 } 4558 4559 // Init pset_loadavg function pointer 4560 init_pset_getloadavg_ptr(); 4561 4562 return JNI_OK; 4563} 4564 4565// Mark the polling page as unreadable 4566void os::make_polling_page_unreadable(void) { 4567 if (mprotect((char *)_polling_page, page_size, PROT_NONE) != 0) { 4568 fatal("Could not disable polling page"); 4569 } 4570} 4571 4572// Mark the polling page as readable 4573void os::make_polling_page_readable(void) { 4574 if (mprotect((char *)_polling_page, page_size, PROT_READ) != 0) { 4575 fatal("Could not enable polling page"); 4576 } 4577} 4578 4579// OS interface. 4580 4581bool os::check_heap(bool force) { return true; } 4582 4583// Is a (classpath) directory empty? 4584bool os::dir_is_empty(const char* path) { 4585 DIR *dir = NULL; 4586 struct dirent *ptr; 4587 4588 dir = opendir(path); 4589 if (dir == NULL) return true; 4590 4591 // Scan the directory 4592 bool result = true; 4593 char buf[sizeof(struct dirent) + MAX_PATH]; 4594 struct dirent *dbuf = (struct dirent *) buf; 4595 while (result && (ptr = readdir(dir, dbuf)) != NULL) { 4596 if (strcmp(ptr->d_name, ".") != 0 && strcmp(ptr->d_name, "..") != 0) { 4597 result = false; 4598 } 4599 } 4600 closedir(dir); 4601 return result; 4602} 4603 4604// This code originates from JDK's sysOpen and open64_w 4605// from src/solaris/hpi/src/system_md.c 4606 4607int os::open(const char *path, int oflag, int mode) { 4608 if (strlen(path) > MAX_PATH - 1) { 4609 errno = ENAMETOOLONG; 4610 return -1; 4611 } 4612 int fd; 4613 4614 fd = ::open64(path, oflag, mode); 4615 if (fd == -1) return -1; 4616 4617 // If the open succeeded, the file might still be a directory 4618 { 4619 struct stat64 buf64; 4620 int ret = ::fstat64(fd, &buf64); 4621 int st_mode = buf64.st_mode; 4622 4623 if (ret != -1) { 4624 if ((st_mode & S_IFMT) == S_IFDIR) { 4625 errno = EISDIR; 4626 ::close(fd); 4627 return -1; 4628 } 4629 } else { 4630 ::close(fd); 4631 return -1; 4632 } 4633 } 4634 4635 // 32-bit Solaris systems suffer from: 4636 // 4637 // - an historical default soft limit of 256 per-process file 4638 // descriptors that is too low for many Java programs. 4639 // 4640 // - a design flaw where file descriptors created using stdio 4641 // fopen must be less than 256, _even_ when the first limit above 4642 // has been raised. This can cause calls to fopen (but not calls to 4643 // open, for example) to fail mysteriously, perhaps in 3rd party 4644 // native code (although the JDK itself uses fopen). One can hardly 4645 // criticize them for using this most standard of all functions. 4646 // 4647 // We attempt to make everything work anyways by: 4648 // 4649 // - raising the soft limit on per-process file descriptors beyond 4650 // 256 4651 // 4652 // - As of Solaris 10u4, we can request that Solaris raise the 256 4653 // stdio fopen limit by calling function enable_extended_FILE_stdio. 4654 // This is done in init_2 and recorded in enabled_extended_FILE_stdio 4655 // 4656 // - If we are stuck on an old (pre 10u4) Solaris system, we can 4657 // workaround the bug by remapping non-stdio file descriptors below 4658 // 256 to ones beyond 256, which is done below. 4659 // 4660 // See: 4661 // 1085341: 32-bit stdio routines should support file descriptors >255 4662 // 6533291: Work around 32-bit Solaris stdio limit of 256 open files 4663 // 6431278: Netbeans crash on 32 bit Solaris: need to call 4664 // enable_extended_FILE_stdio() in VM initialisation 4665 // Giri Mandalika's blog 4666 // http://technopark02.blogspot.com/2005_05_01_archive.html 4667 // 4668#ifndef _LP64 4669 if ((!enabled_extended_FILE_stdio) && fd < 256) { 4670 int newfd = ::fcntl(fd, F_DUPFD, 256); 4671 if (newfd != -1) { 4672 ::close(fd); 4673 fd = newfd; 4674 } 4675 } 4676#endif // 32-bit Solaris 4677 4678 // All file descriptors that are opened in the JVM and not 4679 // specifically destined for a subprocess should have the 4680 // close-on-exec flag set. If we don't set it, then careless 3rd 4681 // party native code might fork and exec without closing all 4682 // appropriate file descriptors (e.g. as we do in closeDescriptors in 4683 // UNIXProcess.c), and this in turn might: 4684 // 4685 // - cause end-of-file to fail to be detected on some file 4686 // descriptors, resulting in mysterious hangs, or 4687 // 4688 // - might cause an fopen in the subprocess to fail on a system 4689 // suffering from bug 1085341. 4690 // 4691 // (Yes, the default setting of the close-on-exec flag is a Unix 4692 // design flaw) 4693 // 4694 // See: 4695 // 1085341: 32-bit stdio routines should support file descriptors >255 4696 // 4843136: (process) pipe file descriptor from Runtime.exec not being closed 4697 // 6339493: (process) Runtime.exec does not close all file descriptors on Solaris 9 4698 // 4699#ifdef FD_CLOEXEC 4700 { 4701 int flags = ::fcntl(fd, F_GETFD); 4702 if (flags != -1) { 4703 ::fcntl(fd, F_SETFD, flags | FD_CLOEXEC); 4704 } 4705 } 4706#endif 4707 4708 return fd; 4709} 4710 4711// create binary file, rewriting existing file if required 4712int os::create_binary_file(const char* path, bool rewrite_existing) { 4713 int oflags = O_WRONLY | O_CREAT; 4714 if (!rewrite_existing) { 4715 oflags |= O_EXCL; 4716 } 4717 return ::open64(path, oflags, S_IREAD | S_IWRITE); 4718} 4719 4720// return current position of file pointer 4721jlong os::current_file_offset(int fd) { 4722 return (jlong)::lseek64(fd, (off64_t)0, SEEK_CUR); 4723} 4724 4725// move file pointer to the specified offset 4726jlong os::seek_to_file_offset(int fd, jlong offset) { 4727 return (jlong)::lseek64(fd, (off64_t)offset, SEEK_SET); 4728} 4729 4730jlong os::lseek(int fd, jlong offset, int whence) { 4731 return (jlong) ::lseek64(fd, offset, whence); 4732} 4733 4734char * os::native_path(char *path) { 4735 return path; 4736} 4737 4738int os::ftruncate(int fd, jlong length) { 4739 return ::ftruncate64(fd, length); 4740} 4741 4742int os::fsync(int fd) { 4743 RESTARTABLE_RETURN_INT(::fsync(fd)); 4744} 4745 4746int os::available(int fd, jlong *bytes) { 4747 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 4748 "Assumed _thread_in_native"); 4749 jlong cur, end; 4750 int mode; 4751 struct stat64 buf64; 4752 4753 if (::fstat64(fd, &buf64) >= 0) { 4754 mode = buf64.st_mode; 4755 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) { 4756 int n,ioctl_return; 4757 4758 RESTARTABLE(::ioctl(fd, FIONREAD, &n), ioctl_return); 4759 if (ioctl_return>= 0) { 4760 *bytes = n; 4761 return 1; 4762 } 4763 } 4764 } 4765 if ((cur = ::lseek64(fd, 0L, SEEK_CUR)) == -1) { 4766 return 0; 4767 } else if ((end = ::lseek64(fd, 0L, SEEK_END)) == -1) { 4768 return 0; 4769 } else if (::lseek64(fd, cur, SEEK_SET) == -1) { 4770 return 0; 4771 } 4772 *bytes = end - cur; 4773 return 1; 4774} 4775 4776// Map a block of memory. 4777char* os::pd_map_memory(int fd, const char* file_name, size_t file_offset, 4778 char *addr, size_t bytes, bool read_only, 4779 bool allow_exec) { 4780 int prot; 4781 int flags; 4782 4783 if (read_only) { 4784 prot = PROT_READ; 4785 flags = MAP_SHARED; 4786 } else { 4787 prot = PROT_READ | PROT_WRITE; 4788 flags = MAP_PRIVATE; 4789 } 4790 4791 if (allow_exec) { 4792 prot |= PROT_EXEC; 4793 } 4794 4795 if (addr != NULL) { 4796 flags |= MAP_FIXED; 4797 } 4798 4799 char* mapped_address = (char*)mmap(addr, (size_t)bytes, prot, flags, 4800 fd, file_offset); 4801 if (mapped_address == MAP_FAILED) { 4802 return NULL; 4803 } 4804 return mapped_address; 4805} 4806 4807 4808// Remap a block of memory. 4809char* os::pd_remap_memory(int fd, const char* file_name, size_t file_offset, 4810 char *addr, size_t bytes, bool read_only, 4811 bool allow_exec) { 4812 // same as map_memory() on this OS 4813 return os::map_memory(fd, file_name, file_offset, addr, bytes, read_only, 4814 allow_exec); 4815} 4816 4817 4818// Unmap a block of memory. 4819bool os::pd_unmap_memory(char* addr, size_t bytes) { 4820 return munmap(addr, bytes) == 0; 4821} 4822 4823void os::pause() { 4824 char filename[MAX_PATH]; 4825 if (PauseAtStartupFile && PauseAtStartupFile[0]) { 4826 jio_snprintf(filename, MAX_PATH, PauseAtStartupFile); 4827 } else { 4828 jio_snprintf(filename, MAX_PATH, "./vm.paused.%d", current_process_id()); 4829 } 4830 4831 int fd = ::open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); 4832 if (fd != -1) { 4833 struct stat buf; 4834 ::close(fd); 4835 while (::stat(filename, &buf) == 0) { 4836 (void)::poll(NULL, 0, 100); 4837 } 4838 } else { 4839 jio_fprintf(stderr, 4840 "Could not open pause file '%s', continuing immediately.\n", filename); 4841 } 4842} 4843 4844#ifndef PRODUCT 4845#ifdef INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS 4846// Turn this on if you need to trace synch operations. 4847// Set RECORD_SYNCH_LIMIT to a large-enough value, 4848// and call record_synch_enable and record_synch_disable 4849// around the computation of interest. 4850 4851void record_synch(char* name, bool returning); // defined below 4852 4853class RecordSynch { 4854 char* _name; 4855 public: 4856 RecordSynch(char* name) :_name(name) { record_synch(_name, false); } 4857 ~RecordSynch() { record_synch(_name, true); } 4858}; 4859 4860#define CHECK_SYNCH_OP(ret, name, params, args, inner) \ 4861extern "C" ret name params { \ 4862 typedef ret name##_t params; \ 4863 static name##_t* implem = NULL; \ 4864 static int callcount = 0; \ 4865 if (implem == NULL) { \ 4866 implem = (name##_t*) dlsym(RTLD_NEXT, #name); \ 4867 if (implem == NULL) fatal(dlerror()); \ 4868 } \ 4869 ++callcount; \ 4870 RecordSynch _rs(#name); \ 4871 inner; \ 4872 return implem args; \ 4873} 4874// in dbx, examine callcounts this way: 4875// for n in $(eval whereis callcount | awk '{print $2}'); do print $n; done 4876 4877#define CHECK_POINTER_OK(p) \ 4878 (!Universe::is_fully_initialized() || !Universe::is_reserved_heap((oop)(p))) 4879#define CHECK_MU \ 4880 if (!CHECK_POINTER_OK(mu)) fatal("Mutex must be in C heap only."); 4881#define CHECK_CV \ 4882 if (!CHECK_POINTER_OK(cv)) fatal("Condvar must be in C heap only."); 4883#define CHECK_P(p) \ 4884 if (!CHECK_POINTER_OK(p)) fatal(false, "Pointer must be in C heap only."); 4885 4886#define CHECK_MUTEX(mutex_op) \ 4887 CHECK_SYNCH_OP(int, mutex_op, (mutex_t *mu), (mu), CHECK_MU); 4888 4889CHECK_MUTEX( mutex_lock) 4890CHECK_MUTEX( _mutex_lock) 4891CHECK_MUTEX( mutex_unlock) 4892CHECK_MUTEX(_mutex_unlock) 4893CHECK_MUTEX( mutex_trylock) 4894CHECK_MUTEX(_mutex_trylock) 4895 4896#define CHECK_COND(cond_op) \ 4897 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu), (cv, mu), CHECK_MU; CHECK_CV); 4898 4899CHECK_COND( cond_wait); 4900CHECK_COND(_cond_wait); 4901CHECK_COND(_cond_wait_cancel); 4902 4903#define CHECK_COND2(cond_op) \ 4904 CHECK_SYNCH_OP(int, cond_op, (cond_t *cv, mutex_t *mu, timestruc_t* ts), (cv, mu, ts), CHECK_MU; CHECK_CV); 4905 4906CHECK_COND2( cond_timedwait); 4907CHECK_COND2(_cond_timedwait); 4908CHECK_COND2(_cond_timedwait_cancel); 4909 4910// do the _lwp_* versions too 4911#define mutex_t lwp_mutex_t 4912#define cond_t lwp_cond_t 4913CHECK_MUTEX( _lwp_mutex_lock) 4914CHECK_MUTEX( _lwp_mutex_unlock) 4915CHECK_MUTEX( _lwp_mutex_trylock) 4916CHECK_MUTEX( __lwp_mutex_lock) 4917CHECK_MUTEX( __lwp_mutex_unlock) 4918CHECK_MUTEX( __lwp_mutex_trylock) 4919CHECK_MUTEX(___lwp_mutex_lock) 4920CHECK_MUTEX(___lwp_mutex_unlock) 4921 4922CHECK_COND( _lwp_cond_wait); 4923CHECK_COND( __lwp_cond_wait); 4924CHECK_COND(___lwp_cond_wait); 4925 4926CHECK_COND2( _lwp_cond_timedwait); 4927CHECK_COND2( __lwp_cond_timedwait); 4928#undef mutex_t 4929#undef cond_t 4930 4931CHECK_SYNCH_OP(int, _lwp_suspend2, (int lwp, int *n), (lwp, n), 0); 4932CHECK_SYNCH_OP(int,__lwp_suspend2, (int lwp, int *n), (lwp, n), 0); 4933CHECK_SYNCH_OP(int, _lwp_kill, (int lwp, int n), (lwp, n), 0); 4934CHECK_SYNCH_OP(int,__lwp_kill, (int lwp, int n), (lwp, n), 0); 4935CHECK_SYNCH_OP(int, _lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p)); 4936CHECK_SYNCH_OP(int,__lwp_sema_wait, (lwp_sema_t* p), (p), CHECK_P(p)); 4937CHECK_SYNCH_OP(int, _lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV); 4938CHECK_SYNCH_OP(int,__lwp_cond_broadcast, (lwp_cond_t* cv), (cv), CHECK_CV); 4939 4940 4941// recording machinery: 4942 4943enum { RECORD_SYNCH_LIMIT = 200 }; 4944char* record_synch_name[RECORD_SYNCH_LIMIT]; 4945void* record_synch_arg0ptr[RECORD_SYNCH_LIMIT]; 4946bool record_synch_returning[RECORD_SYNCH_LIMIT]; 4947thread_t record_synch_thread[RECORD_SYNCH_LIMIT]; 4948int record_synch_count = 0; 4949bool record_synch_enabled = false; 4950 4951// in dbx, examine recorded data this way: 4952// for n in name arg0ptr returning thread; do print record_synch_$n[0..record_synch_count-1]; done 4953 4954void record_synch(char* name, bool returning) { 4955 if (record_synch_enabled) { 4956 if (record_synch_count < RECORD_SYNCH_LIMIT) { 4957 record_synch_name[record_synch_count] = name; 4958 record_synch_returning[record_synch_count] = returning; 4959 record_synch_thread[record_synch_count] = thr_self(); 4960 record_synch_arg0ptr[record_synch_count] = &name; 4961 record_synch_count++; 4962 } 4963 // put more checking code here: 4964 // ... 4965 } 4966} 4967 4968void record_synch_enable() { 4969 // start collecting trace data, if not already doing so 4970 if (!record_synch_enabled) record_synch_count = 0; 4971 record_synch_enabled = true; 4972} 4973 4974void record_synch_disable() { 4975 // stop collecting trace data 4976 record_synch_enabled = false; 4977} 4978 4979#endif // INTERPOSE_ON_SYSTEM_SYNCH_FUNCTIONS 4980#endif // PRODUCT 4981 4982const intptr_t thr_time_off = (intptr_t)(&((prusage_t *)(NULL))->pr_utime); 4983const intptr_t thr_time_size = (intptr_t)(&((prusage_t *)(NULL))->pr_ttime) - 4984 (intptr_t)(&((prusage_t *)(NULL))->pr_utime); 4985 4986 4987// JVMTI & JVM monitoring and management support 4988// The thread_cpu_time() and current_thread_cpu_time() are only 4989// supported if is_thread_cpu_time_supported() returns true. 4990// They are not supported on Solaris T1. 4991 4992// current_thread_cpu_time(bool) and thread_cpu_time(Thread*, bool) 4993// are used by JVM M&M and JVMTI to get user+sys or user CPU time 4994// of a thread. 4995// 4996// current_thread_cpu_time() and thread_cpu_time(Thread *) 4997// returns the fast estimate available on the platform. 4998 4999// hrtime_t gethrvtime() return value includes 5000// user time but does not include system time 5001jlong os::current_thread_cpu_time() { 5002 return (jlong) gethrvtime(); 5003} 5004 5005jlong os::thread_cpu_time(Thread *thread) { 5006 // return user level CPU time only to be consistent with 5007 // what current_thread_cpu_time returns. 5008 // thread_cpu_time_info() must be changed if this changes 5009 return os::thread_cpu_time(thread, false /* user time only */); 5010} 5011 5012jlong os::current_thread_cpu_time(bool user_sys_cpu_time) { 5013 if (user_sys_cpu_time) { 5014 return os::thread_cpu_time(Thread::current(), user_sys_cpu_time); 5015 } else { 5016 return os::current_thread_cpu_time(); 5017 } 5018} 5019 5020jlong os::thread_cpu_time(Thread *thread, bool user_sys_cpu_time) { 5021 char proc_name[64]; 5022 int count; 5023 prusage_t prusage; 5024 jlong lwp_time; 5025 int fd; 5026 5027 sprintf(proc_name, "/proc/%d/lwp/%d/lwpusage", 5028 getpid(), 5029 thread->osthread()->lwp_id()); 5030 fd = ::open(proc_name, O_RDONLY); 5031 if (fd == -1) return -1; 5032 5033 do { 5034 count = ::pread(fd, 5035 (void *)&prusage.pr_utime, 5036 thr_time_size, 5037 thr_time_off); 5038 } while (count < 0 && errno == EINTR); 5039 ::close(fd); 5040 if (count < 0) return -1; 5041 5042 if (user_sys_cpu_time) { 5043 // user + system CPU time 5044 lwp_time = (((jlong)prusage.pr_stime.tv_sec + 5045 (jlong)prusage.pr_utime.tv_sec) * (jlong)1000000000) + 5046 (jlong)prusage.pr_stime.tv_nsec + 5047 (jlong)prusage.pr_utime.tv_nsec; 5048 } else { 5049 // user level CPU time only 5050 lwp_time = ((jlong)prusage.pr_utime.tv_sec * (jlong)1000000000) + 5051 (jlong)prusage.pr_utime.tv_nsec; 5052 } 5053 5054 return (lwp_time); 5055} 5056 5057void os::current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 5058 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 5059 info_ptr->may_skip_backward = false; // elapsed time not wall time 5060 info_ptr->may_skip_forward = false; // elapsed time not wall time 5061 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned 5062} 5063 5064void os::thread_cpu_time_info(jvmtiTimerInfo *info_ptr) { 5065 info_ptr->max_value = ALL_64_BITS; // will not wrap in less than 64 bits 5066 info_ptr->may_skip_backward = false; // elapsed time not wall time 5067 info_ptr->may_skip_forward = false; // elapsed time not wall time 5068 info_ptr->kind = JVMTI_TIMER_USER_CPU; // only user time is returned 5069} 5070 5071bool os::is_thread_cpu_time_supported() { 5072 return true; 5073} 5074 5075// System loadavg support. Returns -1 if load average cannot be obtained. 5076// Return the load average for our processor set if the primitive exists 5077// (Solaris 9 and later). Otherwise just return system wide loadavg. 5078int os::loadavg(double loadavg[], int nelem) { 5079 if (pset_getloadavg_ptr != NULL) { 5080 return (*pset_getloadavg_ptr)(PS_MYID, loadavg, nelem); 5081 } else { 5082 return ::getloadavg(loadavg, nelem); 5083 } 5084} 5085 5086//--------------------------------------------------------------------------------- 5087 5088bool os::find(address addr, outputStream* st) { 5089 Dl_info dlinfo; 5090 memset(&dlinfo, 0, sizeof(dlinfo)); 5091 if (dladdr(addr, &dlinfo) != 0) { 5092 st->print(PTR_FORMAT ": ", addr); 5093 if (dlinfo.dli_sname != NULL && dlinfo.dli_saddr != NULL) { 5094 st->print("%s+%#lx", dlinfo.dli_sname, addr-(intptr_t)dlinfo.dli_saddr); 5095 } else if (dlinfo.dli_fbase != NULL) { 5096 st->print("<offset %#lx>", addr-(intptr_t)dlinfo.dli_fbase); 5097 } else { 5098 st->print("<absolute address>"); 5099 } 5100 if (dlinfo.dli_fname != NULL) { 5101 st->print(" in %s", dlinfo.dli_fname); 5102 } 5103 if (dlinfo.dli_fbase != NULL) { 5104 st->print(" at " PTR_FORMAT, dlinfo.dli_fbase); 5105 } 5106 st->cr(); 5107 5108 if (Verbose) { 5109 // decode some bytes around the PC 5110 address begin = clamp_address_in_page(addr-40, addr, os::vm_page_size()); 5111 address end = clamp_address_in_page(addr+40, addr, os::vm_page_size()); 5112 address lowest = (address) dlinfo.dli_sname; 5113 if (!lowest) lowest = (address) dlinfo.dli_fbase; 5114 if (begin < lowest) begin = lowest; 5115 Dl_info dlinfo2; 5116 if (dladdr(end, &dlinfo2) != 0 && dlinfo2.dli_saddr != dlinfo.dli_saddr 5117 && end > dlinfo2.dli_saddr && dlinfo2.dli_saddr > begin) { 5118 end = (address) dlinfo2.dli_saddr; 5119 } 5120 Disassembler::decode(begin, end, st); 5121 } 5122 return true; 5123 } 5124 return false; 5125} 5126 5127// Following function has been added to support HotSparc's libjvm.so running 5128// under Solaris production JDK 1.2.2 / 1.3.0. These came from 5129// src/solaris/hpi/native_threads in the EVM codebase. 5130// 5131// NOTE: This is no longer needed in the 1.3.1 and 1.4 production release 5132// libraries and should thus be removed. We will leave it behind for a while 5133// until we no longer want to able to run on top of 1.3.0 Solaris production 5134// JDK. See 4341971. 5135 5136#define STACK_SLACK 0x800 5137 5138extern "C" { 5139 intptr_t sysThreadAvailableStackWithSlack() { 5140 stack_t st; 5141 intptr_t retval, stack_top; 5142 retval = thr_stksegment(&st); 5143 assert(retval == 0, "incorrect return value from thr_stksegment"); 5144 assert((address)&st < (address)st.ss_sp, "Invalid stack base returned"); 5145 assert((address)&st > (address)st.ss_sp-st.ss_size, "Invalid stack size returned"); 5146 stack_top=(intptr_t)st.ss_sp-st.ss_size; 5147 return ((intptr_t)&stack_top - stack_top - STACK_SLACK); 5148 } 5149} 5150 5151// ObjectMonitor park-unpark infrastructure ... 5152// 5153// We implement Solaris and Linux PlatformEvents with the 5154// obvious condvar-mutex-flag triple. 5155// Another alternative that works quite well is pipes: 5156// Each PlatformEvent consists of a pipe-pair. 5157// The thread associated with the PlatformEvent 5158// calls park(), which reads from the input end of the pipe. 5159// Unpark() writes into the other end of the pipe. 5160// The write-side of the pipe must be set NDELAY. 5161// Unfortunately pipes consume a large # of handles. 5162// Native solaris lwp_park() and lwp_unpark() work nicely, too. 5163// Using pipes for the 1st few threads might be workable, however. 5164// 5165// park() is permitted to return spuriously. 5166// Callers of park() should wrap the call to park() in 5167// an appropriate loop. A litmus test for the correct 5168// usage of park is the following: if park() were modified 5169// to immediately return 0 your code should still work, 5170// albeit degenerating to a spin loop. 5171// 5172// In a sense, park()-unpark() just provides more polite spinning 5173// and polling with the key difference over naive spinning being 5174// that a parked thread needs to be explicitly unparked() in order 5175// to wake up and to poll the underlying condition. 5176// 5177// Assumption: 5178// Only one parker can exist on an event, which is why we allocate 5179// them per-thread. Multiple unparkers can coexist. 5180// 5181// _Event transitions in park() 5182// -1 => -1 : illegal 5183// 1 => 0 : pass - return immediately 5184// 0 => -1 : block; then set _Event to 0 before returning 5185// 5186// _Event transitions in unpark() 5187// 0 => 1 : just return 5188// 1 => 1 : just return 5189// -1 => either 0 or 1; must signal target thread 5190// That is, we can safely transition _Event from -1 to either 5191// 0 or 1. 5192// 5193// _Event serves as a restricted-range semaphore. 5194// -1 : thread is blocked, i.e. there is a waiter 5195// 0 : neutral: thread is running or ready, 5196// could have been signaled after a wait started 5197// 1 : signaled - thread is running or ready 5198// 5199// Another possible encoding of _Event would be with 5200// explicit "PARKED" == 01b and "SIGNALED" == 10b bits. 5201// 5202// TODO-FIXME: add DTRACE probes for: 5203// 1. Tx parks 5204// 2. Ty unparks Tx 5205// 3. Tx resumes from park 5206 5207 5208// value determined through experimentation 5209#define ROUNDINGFIX 11 5210 5211// utility to compute the abstime argument to timedwait. 5212// TODO-FIXME: switch from compute_abstime() to unpackTime(). 5213 5214static timestruc_t* compute_abstime(timestruc_t* abstime, jlong millis) { 5215 // millis is the relative timeout time 5216 // abstime will be the absolute timeout time 5217 if (millis < 0) millis = 0; 5218 struct timeval now; 5219 int status = gettimeofday(&now, NULL); 5220 assert(status == 0, "gettimeofday"); 5221 jlong seconds = millis / 1000; 5222 jlong max_wait_period; 5223 5224 if (UseLWPSynchronization) { 5225 // forward port of fix for 4275818 (not sleeping long enough) 5226 // There was a bug in Solaris 6, 7 and pre-patch 5 of 8 where 5227 // _lwp_cond_timedwait() used a round_down algorithm rather 5228 // than a round_up. For millis less than our roundfactor 5229 // it rounded down to 0 which doesn't meet the spec. 5230 // For millis > roundfactor we may return a bit sooner, but 5231 // since we can not accurately identify the patch level and 5232 // this has already been fixed in Solaris 9 and 8 we will 5233 // leave it alone rather than always rounding down. 5234 5235 if (millis > 0 && millis < ROUNDINGFIX) millis = ROUNDINGFIX; 5236 // It appears that when we go directly through Solaris _lwp_cond_timedwait() 5237 // the acceptable max time threshold is smaller than for libthread on 2.5.1 and 2.6 5238 max_wait_period = 21000000; 5239 } else { 5240 max_wait_period = 50000000; 5241 } 5242 millis %= 1000; 5243 if (seconds > max_wait_period) { // see man cond_timedwait(3T) 5244 seconds = max_wait_period; 5245 } 5246 abstime->tv_sec = now.tv_sec + seconds; 5247 long usec = now.tv_usec + millis * 1000; 5248 if (usec >= 1000000) { 5249 abstime->tv_sec += 1; 5250 usec -= 1000000; 5251 } 5252 abstime->tv_nsec = usec * 1000; 5253 return abstime; 5254} 5255 5256void os::PlatformEvent::park() { // AKA: down() 5257 // Transitions for _Event: 5258 // -1 => -1 : illegal 5259 // 1 => 0 : pass - return immediately 5260 // 0 => -1 : block; then set _Event to 0 before returning 5261 5262 // Invariant: Only the thread associated with the Event/PlatformEvent 5263 // may call park(). 5264 assert(_nParked == 0, "invariant"); 5265 5266 int v; 5267 for (;;) { 5268 v = _Event; 5269 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 5270 } 5271 guarantee(v >= 0, "invariant"); 5272 if (v == 0) { 5273 // Do this the hard way by blocking ... 5274 // See http://monaco.sfbay/detail.jsf?cr=5094058. 5275 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking. 5276 // Only for SPARC >= V8PlusA 5277#if defined(__sparc) && defined(COMPILER2) 5278 if (ClearFPUAtPark) { _mark_fpu_nosave(); } 5279#endif 5280 int status = os::Solaris::mutex_lock(_mutex); 5281 assert_status(status == 0, status, "mutex_lock"); 5282 guarantee(_nParked == 0, "invariant"); 5283 ++_nParked; 5284 while (_Event < 0) { 5285 // for some reason, under 2.7 lwp_cond_wait() may return ETIME ... 5286 // Treat this the same as if the wait was interrupted 5287 // With usr/lib/lwp going to kernel, always handle ETIME 5288 status = os::Solaris::cond_wait(_cond, _mutex); 5289 if (status == ETIME) status = EINTR; 5290 assert_status(status == 0 || status == EINTR, status, "cond_wait"); 5291 } 5292 --_nParked; 5293 _Event = 0; 5294 status = os::Solaris::mutex_unlock(_mutex); 5295 assert_status(status == 0, status, "mutex_unlock"); 5296 // Paranoia to ensure our locked and lock-free paths interact 5297 // correctly with each other. 5298 OrderAccess::fence(); 5299 } 5300} 5301 5302int os::PlatformEvent::park(jlong millis) { 5303 // Transitions for _Event: 5304 // -1 => -1 : illegal 5305 // 1 => 0 : pass - return immediately 5306 // 0 => -1 : block; then set _Event to 0 before returning 5307 5308 guarantee(_nParked == 0, "invariant"); 5309 int v; 5310 for (;;) { 5311 v = _Event; 5312 if (Atomic::cmpxchg(v-1, &_Event, v) == v) break; 5313 } 5314 guarantee(v >= 0, "invariant"); 5315 if (v != 0) return OS_OK; 5316 5317 int ret = OS_TIMEOUT; 5318 timestruc_t abst; 5319 compute_abstime(&abst, millis); 5320 5321 // See http://monaco.sfbay/detail.jsf?cr=5094058. 5322 // For Solaris SPARC set fprs.FEF=0 prior to parking. 5323 // Only for SPARC >= V8PlusA 5324#if defined(__sparc) && defined(COMPILER2) 5325 if (ClearFPUAtPark) { _mark_fpu_nosave(); } 5326#endif 5327 int status = os::Solaris::mutex_lock(_mutex); 5328 assert_status(status == 0, status, "mutex_lock"); 5329 guarantee(_nParked == 0, "invariant"); 5330 ++_nParked; 5331 while (_Event < 0) { 5332 int status = os::Solaris::cond_timedwait(_cond, _mutex, &abst); 5333 assert_status(status == 0 || status == EINTR || 5334 status == ETIME || status == ETIMEDOUT, 5335 status, "cond_timedwait"); 5336 if (!FilterSpuriousWakeups) break; // previous semantics 5337 if (status == ETIME || status == ETIMEDOUT) break; 5338 // We consume and ignore EINTR and spurious wakeups. 5339 } 5340 --_nParked; 5341 if (_Event >= 0) ret = OS_OK; 5342 _Event = 0; 5343 status = os::Solaris::mutex_unlock(_mutex); 5344 assert_status(status == 0, status, "mutex_unlock"); 5345 // Paranoia to ensure our locked and lock-free paths interact 5346 // correctly with each other. 5347 OrderAccess::fence(); 5348 return ret; 5349} 5350 5351void os::PlatformEvent::unpark() { 5352 // Transitions for _Event: 5353 // 0 => 1 : just return 5354 // 1 => 1 : just return 5355 // -1 => either 0 or 1; must signal target thread 5356 // That is, we can safely transition _Event from -1 to either 5357 // 0 or 1. 5358 // See also: "Semaphores in Plan 9" by Mullender & Cox 5359 // 5360 // Note: Forcing a transition from "-1" to "1" on an unpark() means 5361 // that it will take two back-to-back park() calls for the owning 5362 // thread to block. This has the benefit of forcing a spurious return 5363 // from the first park() call after an unpark() call which will help 5364 // shake out uses of park() and unpark() without condition variables. 5365 5366 if (Atomic::xchg(1, &_Event) >= 0) return; 5367 5368 // If the thread associated with the event was parked, wake it. 5369 // Wait for the thread assoc with the PlatformEvent to vacate. 5370 int status = os::Solaris::mutex_lock(_mutex); 5371 assert_status(status == 0, status, "mutex_lock"); 5372 int AnyWaiters = _nParked; 5373 status = os::Solaris::mutex_unlock(_mutex); 5374 assert_status(status == 0, status, "mutex_unlock"); 5375 guarantee(AnyWaiters == 0 || AnyWaiters == 1, "invariant"); 5376 if (AnyWaiters != 0) { 5377 // Note that we signal() *after* dropping the lock for "immortal" Events. 5378 // This is safe and avoids a common class of futile wakeups. In rare 5379 // circumstances this can cause a thread to return prematurely from 5380 // cond_{timed}wait() but the spurious wakeup is benign and the victim 5381 // will simply re-test the condition and re-park itself. 5382 // This provides particular benefit if the underlying platform does not 5383 // provide wait morphing. 5384 status = os::Solaris::cond_signal(_cond); 5385 assert_status(status == 0, status, "cond_signal"); 5386 } 5387} 5388 5389// JSR166 5390// ------------------------------------------------------- 5391 5392// The solaris and linux implementations of park/unpark are fairly 5393// conservative for now, but can be improved. They currently use a 5394// mutex/condvar pair, plus _counter. 5395// Park decrements _counter if > 0, else does a condvar wait. Unpark 5396// sets count to 1 and signals condvar. Only one thread ever waits 5397// on the condvar. Contention seen when trying to park implies that someone 5398// is unparking you, so don't wait. And spurious returns are fine, so there 5399// is no need to track notifications. 5400 5401#define MAX_SECS 100000000 5402 5403// This code is common to linux and solaris and will be moved to a 5404// common place in dolphin. 5405// 5406// The passed in time value is either a relative time in nanoseconds 5407// or an absolute time in milliseconds. Either way it has to be unpacked 5408// into suitable seconds and nanoseconds components and stored in the 5409// given timespec structure. 5410// Given time is a 64-bit value and the time_t used in the timespec is only 5411// a signed-32-bit value (except on 64-bit Linux) we have to watch for 5412// overflow if times way in the future are given. Further on Solaris versions 5413// prior to 10 there is a restriction (see cond_timedwait) that the specified 5414// number of seconds, in abstime, is less than current_time + 100,000,000. 5415// As it will be 28 years before "now + 100000000" will overflow we can 5416// ignore overflow and just impose a hard-limit on seconds using the value 5417// of "now + 100,000,000". This places a limit on the timeout of about 3.17 5418// years from "now". 5419// 5420static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) { 5421 assert(time > 0, "convertTime"); 5422 5423 struct timeval now; 5424 int status = gettimeofday(&now, NULL); 5425 assert(status == 0, "gettimeofday"); 5426 5427 time_t max_secs = now.tv_sec + MAX_SECS; 5428 5429 if (isAbsolute) { 5430 jlong secs = time / 1000; 5431 if (secs > max_secs) { 5432 absTime->tv_sec = max_secs; 5433 } else { 5434 absTime->tv_sec = secs; 5435 } 5436 absTime->tv_nsec = (time % 1000) * NANOSECS_PER_MILLISEC; 5437 } else { 5438 jlong secs = time / NANOSECS_PER_SEC; 5439 if (secs >= MAX_SECS) { 5440 absTime->tv_sec = max_secs; 5441 absTime->tv_nsec = 0; 5442 } else { 5443 absTime->tv_sec = now.tv_sec + secs; 5444 absTime->tv_nsec = (time % NANOSECS_PER_SEC) + now.tv_usec*1000; 5445 if (absTime->tv_nsec >= NANOSECS_PER_SEC) { 5446 absTime->tv_nsec -= NANOSECS_PER_SEC; 5447 ++absTime->tv_sec; // note: this must be <= max_secs 5448 } 5449 } 5450 } 5451 assert(absTime->tv_sec >= 0, "tv_sec < 0"); 5452 assert(absTime->tv_sec <= max_secs, "tv_sec > max_secs"); 5453 assert(absTime->tv_nsec >= 0, "tv_nsec < 0"); 5454 assert(absTime->tv_nsec < NANOSECS_PER_SEC, "tv_nsec >= nanos_per_sec"); 5455} 5456 5457void Parker::park(bool isAbsolute, jlong time) { 5458 // Ideally we'd do something useful while spinning, such 5459 // as calling unpackTime(). 5460 5461 // Optional fast-path check: 5462 // Return immediately if a permit is available. 5463 // We depend on Atomic::xchg() having full barrier semantics 5464 // since we are doing a lock-free update to _counter. 5465 if (Atomic::xchg(0, &_counter) > 0) return; 5466 5467 // Optional fast-exit: Check interrupt before trying to wait 5468 Thread* thread = Thread::current(); 5469 assert(thread->is_Java_thread(), "Must be JavaThread"); 5470 JavaThread *jt = (JavaThread *)thread; 5471 if (Thread::is_interrupted(thread, false)) { 5472 return; 5473 } 5474 5475 // First, demultiplex/decode time arguments 5476 timespec absTime; 5477 if (time < 0 || (isAbsolute && time == 0)) { // don't wait at all 5478 return; 5479 } 5480 if (time > 0) { 5481 // Warning: this code might be exposed to the old Solaris time 5482 // round-down bugs. Grep "roundingFix" for details. 5483 unpackTime(&absTime, isAbsolute, time); 5484 } 5485 5486 // Enter safepoint region 5487 // Beware of deadlocks such as 6317397. 5488 // The per-thread Parker:: _mutex is a classic leaf-lock. 5489 // In particular a thread must never block on the Threads_lock while 5490 // holding the Parker:: mutex. If safepoints are pending both the 5491 // the ThreadBlockInVM() CTOR and DTOR may grab Threads_lock. 5492 ThreadBlockInVM tbivm(jt); 5493 5494 // Don't wait if cannot get lock since interference arises from 5495 // unblocking. Also. check interrupt before trying wait 5496 if (Thread::is_interrupted(thread, false) || 5497 os::Solaris::mutex_trylock(_mutex) != 0) { 5498 return; 5499 } 5500 5501 int status; 5502 5503 if (_counter > 0) { // no wait needed 5504 _counter = 0; 5505 status = os::Solaris::mutex_unlock(_mutex); 5506 assert(status == 0, "invariant"); 5507 // Paranoia to ensure our locked and lock-free paths interact 5508 // correctly with each other and Java-level accesses. 5509 OrderAccess::fence(); 5510 return; 5511 } 5512 5513#ifdef ASSERT 5514 // Don't catch signals while blocked; let the running threads have the signals. 5515 // (This allows a debugger to break into the running thread.) 5516 sigset_t oldsigs; 5517 sigset_t* allowdebug_blocked = os::Solaris::allowdebug_blocked_signals(); 5518 thr_sigsetmask(SIG_BLOCK, allowdebug_blocked, &oldsigs); 5519#endif 5520 5521 OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); 5522 jt->set_suspend_equivalent(); 5523 // cleared by handle_special_suspend_equivalent_condition() or java_suspend_self() 5524 5525 // Do this the hard way by blocking ... 5526 // See http://monaco.sfbay/detail.jsf?cr=5094058. 5527 // TODO-FIXME: for Solaris SPARC set fprs.FEF=0 prior to parking. 5528 // Only for SPARC >= V8PlusA 5529#if defined(__sparc) && defined(COMPILER2) 5530 if (ClearFPUAtPark) { _mark_fpu_nosave(); } 5531#endif 5532 5533 if (time == 0) { 5534 status = os::Solaris::cond_wait(_cond, _mutex); 5535 } else { 5536 status = os::Solaris::cond_timedwait (_cond, _mutex, &absTime); 5537 } 5538 // Note that an untimed cond_wait() can sometimes return ETIME on older 5539 // versions of the Solaris. 5540 assert_status(status == 0 || status == EINTR || 5541 status == ETIME || status == ETIMEDOUT, 5542 status, "cond_timedwait"); 5543 5544#ifdef ASSERT 5545 thr_sigsetmask(SIG_SETMASK, &oldsigs, NULL); 5546#endif 5547 _counter = 0; 5548 status = os::Solaris::mutex_unlock(_mutex); 5549 assert_status(status == 0, status, "mutex_unlock"); 5550 // Paranoia to ensure our locked and lock-free paths interact 5551 // correctly with each other and Java-level accesses. 5552 OrderAccess::fence(); 5553 5554 // If externally suspended while waiting, re-suspend 5555 if (jt->handle_special_suspend_equivalent_condition()) { 5556 jt->java_suspend_self(); 5557 } 5558} 5559 5560void Parker::unpark() { 5561 int status = os::Solaris::mutex_lock(_mutex); 5562 assert(status == 0, "invariant"); 5563 const int s = _counter; 5564 _counter = 1; 5565 status = os::Solaris::mutex_unlock(_mutex); 5566 assert(status == 0, "invariant"); 5567 5568 if (s < 1) { 5569 status = os::Solaris::cond_signal(_cond); 5570 assert(status == 0, "invariant"); 5571 } 5572} 5573 5574extern char** environ; 5575 5576// Run the specified command in a separate process. Return its exit value, 5577// or -1 on failure (e.g. can't fork a new process). 5578// Unlike system(), this function can be called from signal handler. It 5579// doesn't block SIGINT et al. 5580int os::fork_and_exec(char* cmd) { 5581 char * argv[4]; 5582 argv[0] = (char *)"sh"; 5583 argv[1] = (char *)"-c"; 5584 argv[2] = cmd; 5585 argv[3] = NULL; 5586 5587 // fork is async-safe, fork1 is not so can't use in signal handler 5588 pid_t pid; 5589 Thread* t = Thread::current_or_null_safe(); 5590 if (t != NULL && t->is_inside_signal_handler()) { 5591 pid = fork(); 5592 } else { 5593 pid = fork1(); 5594 } 5595 5596 if (pid < 0) { 5597 // fork failed 5598 warning("fork failed: %s", strerror(errno)); 5599 return -1; 5600 5601 } else if (pid == 0) { 5602 // child process 5603 5604 // try to be consistent with system(), which uses "/usr/bin/sh" on Solaris 5605 execve("/usr/bin/sh", argv, environ); 5606 5607 // execve failed 5608 _exit(-1); 5609 5610 } else { 5611 // copied from J2SE ..._waitForProcessExit() in UNIXProcess_md.c; we don't 5612 // care about the actual exit code, for now. 5613 5614 int status; 5615 5616 // Wait for the child process to exit. This returns immediately if 5617 // the child has already exited. */ 5618 while (waitpid(pid, &status, 0) < 0) { 5619 switch (errno) { 5620 case ECHILD: return 0; 5621 case EINTR: break; 5622 default: return -1; 5623 } 5624 } 5625 5626 if (WIFEXITED(status)) { 5627 // The child exited normally; get its exit code. 5628 return WEXITSTATUS(status); 5629 } else if (WIFSIGNALED(status)) { 5630 // The child exited because of a signal 5631 // The best value to return is 0x80 + signal number, 5632 // because that is what all Unix shells do, and because 5633 // it allows callers to distinguish between process exit and 5634 // process death by signal. 5635 return 0x80 + WTERMSIG(status); 5636 } else { 5637 // Unknown exit code; pass it through 5638 return status; 5639 } 5640 } 5641} 5642 5643// is_headless_jre() 5644// 5645// Test for the existence of xawt/libmawt.so or libawt_xawt.so 5646// in order to report if we are running in a headless jre 5647// 5648// Since JDK8 xawt/libmawt.so was moved into the same directory 5649// as libawt.so, and renamed libawt_xawt.so 5650// 5651bool os::is_headless_jre() { 5652 struct stat statbuf; 5653 char buf[MAXPATHLEN]; 5654 char libmawtpath[MAXPATHLEN]; 5655 const char *xawtstr = "/xawt/libmawt.so"; 5656 const char *new_xawtstr = "/libawt_xawt.so"; 5657 char *p; 5658 5659 // Get path to libjvm.so 5660 os::jvm_path(buf, sizeof(buf)); 5661 5662 // Get rid of libjvm.so 5663 p = strrchr(buf, '/'); 5664 if (p == NULL) { 5665 return false; 5666 } else { 5667 *p = '\0'; 5668 } 5669 5670 // Get rid of client or server 5671 p = strrchr(buf, '/'); 5672 if (p == NULL) { 5673 return false; 5674 } else { 5675 *p = '\0'; 5676 } 5677 5678 // check xawt/libmawt.so 5679 strcpy(libmawtpath, buf); 5680 strcat(libmawtpath, xawtstr); 5681 if (::stat(libmawtpath, &statbuf) == 0) return false; 5682 5683 // check libawt_xawt.so 5684 strcpy(libmawtpath, buf); 5685 strcat(libmawtpath, new_xawtstr); 5686 if (::stat(libmawtpath, &statbuf) == 0) return false; 5687 5688 return true; 5689} 5690 5691size_t os::write(int fd, const void *buf, unsigned int nBytes) { 5692 size_t res; 5693 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 5694 "Assumed _thread_in_native"); 5695 RESTARTABLE((size_t) ::write(fd, buf, (size_t) nBytes), res); 5696 return res; 5697} 5698 5699int os::close(int fd) { 5700 return ::close(fd); 5701} 5702 5703int os::socket_close(int fd) { 5704 return ::close(fd); 5705} 5706 5707int os::recv(int fd, char* buf, size_t nBytes, uint flags) { 5708 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 5709 "Assumed _thread_in_native"); 5710 RESTARTABLE_RETURN_INT((int)::recv(fd, buf, nBytes, flags)); 5711} 5712 5713int os::send(int fd, char* buf, size_t nBytes, uint flags) { 5714 assert(((JavaThread*)Thread::current())->thread_state() == _thread_in_native, 5715 "Assumed _thread_in_native"); 5716 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags)); 5717} 5718 5719int os::raw_send(int fd, char* buf, size_t nBytes, uint flags) { 5720 RESTARTABLE_RETURN_INT((int)::send(fd, buf, nBytes, flags)); 5721} 5722 5723// As both poll and select can be interrupted by signals, we have to be 5724// prepared to restart the system call after updating the timeout, unless 5725// a poll() is done with timeout == -1, in which case we repeat with this 5726// "wait forever" value. 5727 5728int os::connect(int fd, struct sockaddr *him, socklen_t len) { 5729 int _result; 5730 _result = ::connect(fd, him, len); 5731 5732 // On Solaris, when a connect() call is interrupted, the connection 5733 // can be established asynchronously (see 6343810). Subsequent calls 5734 // to connect() must check the errno value which has the semantic 5735 // described below (copied from the connect() man page). Handling 5736 // of asynchronously established connections is required for both 5737 // blocking and non-blocking sockets. 5738 // EINTR The connection attempt was interrupted 5739 // before any data arrived by the delivery of 5740 // a signal. The connection, however, will be 5741 // established asynchronously. 5742 // 5743 // EINPROGRESS The socket is non-blocking, and the connec- 5744 // tion cannot be completed immediately. 5745 // 5746 // EALREADY The socket is non-blocking, and a previous 5747 // connection attempt has not yet been com- 5748 // pleted. 5749 // 5750 // EISCONN The socket is already connected. 5751 if (_result == OS_ERR && errno == EINTR) { 5752 // restarting a connect() changes its errno semantics 5753 RESTARTABLE(::connect(fd, him, len), _result); 5754 // undo these changes 5755 if (_result == OS_ERR) { 5756 if (errno == EALREADY) { 5757 errno = EINPROGRESS; // fall through 5758 } else if (errno == EISCONN) { 5759 errno = 0; 5760 return OS_OK; 5761 } 5762 } 5763 } 5764 return _result; 5765} 5766 5767// Get the default path to the core file 5768// Returns the length of the string 5769int os::get_core_path(char* buffer, size_t bufferSize) { 5770 const char* p = get_current_directory(buffer, bufferSize); 5771 5772 if (p == NULL) { 5773 assert(p != NULL, "failed to get current directory"); 5774 return 0; 5775 } 5776 5777 jio_snprintf(buffer, bufferSize, "%s/core or core.%d", 5778 p, current_process_id()); 5779 5780 return strlen(buffer); 5781} 5782 5783#ifndef PRODUCT 5784void TestReserveMemorySpecial_test() { 5785 // No tests available for this platform 5786} 5787#endif 5788 5789bool os::start_debugging(char *buf, int buflen) { 5790 int len = (int)strlen(buf); 5791 char *p = &buf[len]; 5792 5793 jio_snprintf(p, buflen-len, 5794 "\n\n" 5795 "Do you want to debug the problem?\n\n" 5796 "To debug, run 'dbx - %d'; then switch to thread " INTX_FORMAT "\n" 5797 "Enter 'yes' to launch dbx automatically (PATH must include dbx)\n" 5798 "Otherwise, press RETURN to abort...", 5799 os::current_process_id(), os::current_thread_id()); 5800 5801 bool yes = os::message_box("Unexpected Error", buf); 5802 5803 if (yes) { 5804 // yes, user asked VM to launch debugger 5805 jio_snprintf(buf, sizeof(buf), "dbx - %d", os::current_process_id()); 5806 5807 os::fork_and_exec(buf); 5808 yes = false; 5809 } 5810 return yes; 5811} 5812