os.hpp revision 5966:e2722a66aba7
1/* 2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#ifndef SHARE_VM_RUNTIME_OS_HPP 26#define SHARE_VM_RUNTIME_OS_HPP 27 28#include "jvmtifiles/jvmti.h" 29#include "runtime/atomic.hpp" 30#include "runtime/extendedPC.hpp" 31#include "runtime/handles.hpp" 32#include "utilities/top.hpp" 33#ifdef TARGET_OS_FAMILY_linux 34# include "jvm_linux.h" 35# include <setjmp.h> 36#endif 37#ifdef TARGET_OS_FAMILY_solaris 38# include "jvm_solaris.h" 39# include <setjmp.h> 40#endif 41#ifdef TARGET_OS_FAMILY_windows 42# include "jvm_windows.h" 43#endif 44#ifdef TARGET_OS_FAMILY_aix 45# include "jvm_aix.h" 46# include <setjmp.h> 47#endif 48#ifdef TARGET_OS_FAMILY_bsd 49# include "jvm_bsd.h" 50# include <setjmp.h> 51#endif 52 53class AgentLibrary; 54 55// os defines the interface to operating system; this includes traditional 56// OS services (time, I/O) as well as other functionality with system- 57// dependent code. 58 59typedef void (*dll_func)(...); 60 61class Thread; 62class JavaThread; 63class Event; 64class DLL; 65class FileHandle; 66template<class E> class GrowableArray; 67 68// %%%%% Moved ThreadState, START_FN, OSThread to new osThread.hpp. -- Rose 69 70// Platform-independent error return values from OS functions 71enum OSReturn { 72 OS_OK = 0, // Operation was successful 73 OS_ERR = -1, // Operation failed 74 OS_INTRPT = -2, // Operation was interrupted 75 OS_TIMEOUT = -3, // Operation timed out 76 OS_NOMEM = -5, // Operation failed for lack of memory 77 OS_NORESOURCE = -6 // Operation failed for lack of nonmemory resource 78}; 79 80enum ThreadPriority { // JLS 20.20.1-3 81 NoPriority = -1, // Initial non-priority value 82 MinPriority = 1, // Minimum priority 83 NormPriority = 5, // Normal (non-daemon) priority 84 NearMaxPriority = 9, // High priority, used for VMThread 85 MaxPriority = 10, // Highest priority, used for WatcherThread 86 // ensures that VMThread doesn't starve profiler 87 CriticalPriority = 11 // Critical thread priority 88}; 89 90// Executable parameter flag for os::commit_memory() and 91// os::commit_memory_or_exit(). 92const bool ExecMem = true; 93 94// Typedef for structured exception handling support 95typedef void (*java_call_t)(JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread); 96 97class os: AllStatic { 98 public: 99 enum { page_sizes_max = 9 }; // Size of _page_sizes array (8 plus a sentinel) 100 101 private: 102 static OSThread* _starting_thread; 103 static address _polling_page; 104 static volatile int32_t * _mem_serialize_page; 105 static uintptr_t _serialize_page_mask; 106 public: 107 static size_t _page_sizes[page_sizes_max]; 108 109 private: 110 static void init_page_sizes(size_t default_page_size) { 111 _page_sizes[0] = default_page_size; 112 _page_sizes[1] = 0; // sentinel 113 } 114 115 static char* pd_reserve_memory(size_t bytes, char* addr = 0, 116 size_t alignment_hint = 0); 117 static char* pd_attempt_reserve_memory_at(size_t bytes, char* addr); 118 static void pd_split_reserved_memory(char *base, size_t size, 119 size_t split, bool realloc); 120 static bool pd_commit_memory(char* addr, size_t bytes, bool executable); 121 static bool pd_commit_memory(char* addr, size_t size, size_t alignment_hint, 122 bool executable); 123 // Same as pd_commit_memory() that either succeeds or calls 124 // vm_exit_out_of_memory() with the specified mesg. 125 static void pd_commit_memory_or_exit(char* addr, size_t bytes, 126 bool executable, const char* mesg); 127 static void pd_commit_memory_or_exit(char* addr, size_t size, 128 size_t alignment_hint, 129 bool executable, const char* mesg); 130 static bool pd_uncommit_memory(char* addr, size_t bytes); 131 static bool pd_release_memory(char* addr, size_t bytes); 132 133 static char* pd_map_memory(int fd, const char* file_name, size_t file_offset, 134 char *addr, size_t bytes, bool read_only = false, 135 bool allow_exec = false); 136 static char* pd_remap_memory(int fd, const char* file_name, size_t file_offset, 137 char *addr, size_t bytes, bool read_only, 138 bool allow_exec); 139 static bool pd_unmap_memory(char *addr, size_t bytes); 140 static void pd_free_memory(char *addr, size_t bytes, size_t alignment_hint); 141 static void pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint); 142 143 144 public: 145 static void init(void); // Called before command line parsing 146 static jint init_2(void); // Called after command line parsing 147 static void init_globals(void) { // Called from init_globals() in init.cpp 148 init_globals_ext(); 149 } 150 static void init_3(void); // Called at the end of vm init 151 152 // File names are case-insensitive on windows only 153 // Override me as needed 154 static int file_name_strcmp(const char* s1, const char* s2); 155 156 static bool getenv(const char* name, char* buffer, int len); 157 static bool have_special_privileges(); 158 159 static jlong javaTimeMillis(); 160 static jlong javaTimeNanos(); 161 static void javaTimeNanos_info(jvmtiTimerInfo *info_ptr); 162 static void run_periodic_checks(); 163 164 165 // Returns the elapsed time in seconds since the vm started. 166 static double elapsedTime(); 167 168 // Returns real time in seconds since an arbitrary point 169 // in the past. 170 static bool getTimesSecs(double* process_real_time, 171 double* process_user_time, 172 double* process_system_time); 173 174 // Interface to the performance counter 175 static jlong elapsed_counter(); 176 static jlong elapsed_frequency(); 177 178 // The "virtual time" of a thread is the amount of time a thread has 179 // actually run. The first function indicates whether the OS supports 180 // this functionality for the current thread, and if so: 181 // * the second enables vtime tracking (if that is required). 182 // * the third tells whether vtime is enabled. 183 // * the fourth returns the elapsed virtual time for the current 184 // thread. 185 static bool supports_vtime(); 186 static bool enable_vtime(); 187 static bool vtime_enabled(); 188 static double elapsedVTime(); 189 190 // Return current local time in a string (YYYY-MM-DD HH:MM:SS). 191 // It is MT safe, but not async-safe, as reading time zone 192 // information may require a lock on some platforms. 193 static char* local_time_string(char *buf, size_t buflen); 194 static struct tm* localtime_pd (const time_t* clock, struct tm* res); 195 // Fill in buffer with current local time as an ISO-8601 string. 196 // E.g., YYYY-MM-DDThh:mm:ss.mmm+zzzz. 197 // Returns buffer, or NULL if it failed. 198 static char* iso8601_time(char* buffer, size_t buffer_length); 199 200 // Interface for detecting multiprocessor system 201 static inline bool is_MP() { 202 assert(_processor_count > 0, "invalid processor count"); 203 return _processor_count > 1 || AssumeMP; 204 } 205 static julong available_memory(); 206 static julong physical_memory(); 207 static bool has_allocatable_memory_limit(julong* limit); 208 static bool is_server_class_machine(); 209 210 // number of CPUs 211 static int processor_count() { 212 return _processor_count; 213 } 214 static void set_processor_count(int count) { _processor_count = count; } 215 216 // Returns the number of CPUs this process is currently allowed to run on. 217 // Note that on some OSes this can change dynamically. 218 static int active_processor_count(); 219 220 // Bind processes to processors. 221 // This is a two step procedure: 222 // first you generate a distribution of processes to processors, 223 // then you bind processes according to that distribution. 224 // Compute a distribution for number of processes to processors. 225 // Stores the processor id's into the distribution array argument. 226 // Returns true if it worked, false if it didn't. 227 static bool distribute_processes(uint length, uint* distribution); 228 // Binds the current process to a processor. 229 // Returns true if it worked, false if it didn't. 230 static bool bind_to_processor(uint processor_id); 231 232 // Give a name to the current thread. 233 static void set_native_thread_name(const char *name); 234 235 // Interface for stack banging (predetect possible stack overflow for 236 // exception processing) There are guard pages, and above that shadow 237 // pages for stack overflow checking. 238 static bool uses_stack_guard_pages(); 239 static bool allocate_stack_guard_pages(); 240 static void bang_stack_shadow_pages(); 241 static bool stack_shadow_pages_available(Thread *thread, methodHandle method); 242 243 // OS interface to Virtual Memory 244 245 // Return the default page size. 246 static int vm_page_size(); 247 248 // Return the page size to use for a region of memory. The min_pages argument 249 // is a hint intended to limit fragmentation; it says the returned page size 250 // should be <= region_max_size / min_pages. Because min_pages is a hint, 251 // this routine may return a size larger than region_max_size / min_pages. 252 // 253 // The current implementation ignores min_pages if a larger page size is an 254 // exact multiple of both region_min_size and region_max_size. This allows 255 // larger pages to be used when doing so would not cause fragmentation; in 256 // particular, a single page can be used when region_min_size == 257 // region_max_size == a supported page size. 258 static size_t page_size_for_region(size_t region_min_size, 259 size_t region_max_size, 260 uint min_pages); 261 262 // Methods for tracing page sizes returned by the above method; enabled by 263 // TracePageSizes. The region_{min,max}_size parameters should be the values 264 // passed to page_size_for_region() and page_size should be the result of that 265 // call. The (optional) base and size parameters should come from the 266 // ReservedSpace base() and size() methods. 267 static void trace_page_sizes(const char* str, const size_t* page_sizes, 268 int count) PRODUCT_RETURN; 269 static void trace_page_sizes(const char* str, const size_t region_min_size, 270 const size_t region_max_size, 271 const size_t page_size, 272 const char* base = NULL, 273 const size_t size = 0) PRODUCT_RETURN; 274 275 static int vm_allocation_granularity(); 276 static char* reserve_memory(size_t bytes, char* addr = 0, 277 size_t alignment_hint = 0); 278 static char* reserve_memory(size_t bytes, char* addr, 279 size_t alignment_hint, MEMFLAGS flags); 280 static char* reserve_memory_aligned(size_t size, size_t alignment); 281 static char* attempt_reserve_memory_at(size_t bytes, char* addr); 282 static void split_reserved_memory(char *base, size_t size, 283 size_t split, bool realloc); 284 static bool commit_memory(char* addr, size_t bytes, bool executable); 285 static bool commit_memory(char* addr, size_t size, size_t alignment_hint, 286 bool executable); 287 // Same as commit_memory() that either succeeds or calls 288 // vm_exit_out_of_memory() with the specified mesg. 289 static void commit_memory_or_exit(char* addr, size_t bytes, 290 bool executable, const char* mesg); 291 static void commit_memory_or_exit(char* addr, size_t size, 292 size_t alignment_hint, 293 bool executable, const char* mesg); 294 static bool uncommit_memory(char* addr, size_t bytes); 295 static bool release_memory(char* addr, size_t bytes); 296 297 enum ProtType { MEM_PROT_NONE, MEM_PROT_READ, MEM_PROT_RW, MEM_PROT_RWX }; 298 static bool protect_memory(char* addr, size_t bytes, ProtType prot, 299 bool is_committed = true); 300 301 static bool guard_memory(char* addr, size_t bytes); 302 static bool unguard_memory(char* addr, size_t bytes); 303 static bool create_stack_guard_pages(char* addr, size_t bytes); 304 static bool pd_create_stack_guard_pages(char* addr, size_t bytes); 305 static bool remove_stack_guard_pages(char* addr, size_t bytes); 306 307 static char* map_memory(int fd, const char* file_name, size_t file_offset, 308 char *addr, size_t bytes, bool read_only = false, 309 bool allow_exec = false); 310 static char* remap_memory(int fd, const char* file_name, size_t file_offset, 311 char *addr, size_t bytes, bool read_only, 312 bool allow_exec); 313 static bool unmap_memory(char *addr, size_t bytes); 314 static void free_memory(char *addr, size_t bytes, size_t alignment_hint); 315 static void realign_memory(char *addr, size_t bytes, size_t alignment_hint); 316 317 // NUMA-specific interface 318 static bool numa_has_static_binding(); 319 static bool numa_has_group_homing(); 320 static void numa_make_local(char *addr, size_t bytes, int lgrp_hint); 321 static void numa_make_global(char *addr, size_t bytes); 322 static size_t numa_get_groups_num(); 323 static size_t numa_get_leaf_groups(int *ids, size_t size); 324 static bool numa_topology_changed(); 325 static int numa_get_group_id(); 326 327 // Page manipulation 328 struct page_info { 329 size_t size; 330 int lgrp_id; 331 }; 332 static bool get_page_info(char *start, page_info* info); 333 static char* scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found); 334 335 static char* non_memory_address_word(); 336 // reserve, commit and pin the entire memory region 337 static char* reserve_memory_special(size_t size, size_t alignment, 338 char* addr, bool executable); 339 static bool release_memory_special(char* addr, size_t bytes); 340 static void large_page_init(); 341 static size_t large_page_size(); 342 static bool can_commit_large_page_memory(); 343 static bool can_execute_large_page_memory(); 344 345 // OS interface to polling page 346 static address get_polling_page() { return _polling_page; } 347 static void set_polling_page(address page) { _polling_page = page; } 348 static bool is_poll_address(address addr) { return addr >= _polling_page && addr < (_polling_page + os::vm_page_size()); } 349 static void make_polling_page_unreadable(); 350 static void make_polling_page_readable(); 351 352 // Routines used to serialize the thread state without using membars 353 static void serialize_thread_states(); 354 355 // Since we write to the serialize page from every thread, we 356 // want stores to be on unique cache lines whenever possible 357 // in order to minimize CPU cross talk. We pre-compute the 358 // amount to shift the thread* to make this offset unique to 359 // each thread. 360 static int get_serialize_page_shift_count() { 361 return SerializePageShiftCount; 362 } 363 364 static void set_serialize_page_mask(uintptr_t mask) { 365 _serialize_page_mask = mask; 366 } 367 368 static unsigned int get_serialize_page_mask() { 369 return _serialize_page_mask; 370 } 371 372 static void set_memory_serialize_page(address page); 373 374 static address get_memory_serialize_page() { 375 return (address)_mem_serialize_page; 376 } 377 378 static inline void write_memory_serialize_page(JavaThread *thread) { 379 uintptr_t page_offset = ((uintptr_t)thread >> 380 get_serialize_page_shift_count()) & 381 get_serialize_page_mask(); 382 *(volatile int32_t *)((uintptr_t)_mem_serialize_page+page_offset) = 1; 383 } 384 385 static bool is_memory_serialize_page(JavaThread *thread, address addr) { 386 if (UseMembar) return false; 387 // Previously this function calculated the exact address of this 388 // thread's serialize page, and checked if the faulting address 389 // was equal. However, some platforms mask off faulting addresses 390 // to the page size, so now we just check that the address is 391 // within the page. This makes the thread argument unnecessary, 392 // but we retain the NULL check to preserve existing behaviour. 393 if (thread == NULL) return false; 394 address page = (address) _mem_serialize_page; 395 return addr >= page && addr < (page + os::vm_page_size()); 396 } 397 398 static void block_on_serialize_page_trap(); 399 400 // threads 401 402 enum ThreadType { 403 vm_thread, 404 cgc_thread, // Concurrent GC thread 405 pgc_thread, // Parallel GC thread 406 java_thread, 407 compiler_thread, 408 watcher_thread, 409 os_thread 410 }; 411 412 static bool create_thread(Thread* thread, 413 ThreadType thr_type, 414 size_t stack_size = 0); 415 static bool create_main_thread(JavaThread* thread); 416 static bool create_attached_thread(JavaThread* thread); 417 static void pd_start_thread(Thread* thread); 418 static void start_thread(Thread* thread); 419 420 static void initialize_thread(Thread* thr); 421 static void free_thread(OSThread* osthread); 422 423 // thread id on Linux/64bit is 64bit, on Windows and Solaris, it's 32bit 424 static intx current_thread_id(); 425 static int current_process_id(); 426 static int sleep(Thread* thread, jlong ms, bool interruptable); 427 static int naked_sleep(); 428 static void infinite_sleep(); // never returns, use with CAUTION 429 static void yield(); // Yields to all threads with same priority 430 enum YieldResult { 431 YIELD_SWITCHED = 1, // caller descheduled, other ready threads exist & ran 432 YIELD_NONEREADY = 0, // No other runnable/ready threads. 433 // platform-specific yield return immediately 434 YIELD_UNKNOWN = -1 // Unknown: platform doesn't support _SWITCHED or _NONEREADY 435 // YIELD_SWITCHED and YIELD_NONREADY imply the platform supports a "strong" 436 // yield that can be used in lieu of blocking. 437 } ; 438 static YieldResult NakedYield () ; 439 static void yield_all(int attempts = 0); // Yields to all other threads including lower priority 440 static void loop_breaker(int attempts); // called from within tight loops to possibly influence time-sharing 441 static OSReturn set_priority(Thread* thread, ThreadPriority priority); 442 static OSReturn get_priority(const Thread* const thread, ThreadPriority& priority); 443 444 static void interrupt(Thread* thread); 445 static bool is_interrupted(Thread* thread, bool clear_interrupted); 446 447 static int pd_self_suspend_thread(Thread* thread); 448 449 static ExtendedPC fetch_frame_from_context(void* ucVoid, intptr_t** sp, intptr_t** fp); 450 static frame fetch_frame_from_context(void* ucVoid); 451 452 static ExtendedPC get_thread_pc(Thread *thread); 453 static void breakpoint(); 454 455 static address current_stack_pointer(); 456 static address current_stack_base(); 457 static size_t current_stack_size(); 458 459 static void verify_stack_alignment() PRODUCT_RETURN; 460 461 static int message_box(const char* title, const char* message); 462 static char* do_you_want_to_debug(const char* message); 463 464 // run cmd in a separate process and return its exit code; or -1 on failures 465 static int fork_and_exec(char *cmd); 466 467 // Set file to send error reports. 468 static void set_error_file(const char *logfile); 469 470 // os::exit() is merged with vm_exit() 471 // static void exit(int num); 472 473 // Terminate the VM, but don't exit the process 474 static void shutdown(); 475 476 // Terminate with an error. Default is to generate a core file on platforms 477 // that support such things. This calls shutdown() and then aborts. 478 static void abort(bool dump_core = true); 479 480 // Die immediately, no exit hook, no abort hook, no cleanup. 481 static void die(); 482 483 // File i/o operations 484 static const int default_file_open_flags(); 485 static int open(const char *path, int oflag, int mode); 486 static FILE* open(int fd, const char* mode); 487 static int close(int fd); 488 static jlong lseek(int fd, jlong offset, int whence); 489 static char* native_path(char *path); 490 static int ftruncate(int fd, jlong length); 491 static int fsync(int fd); 492 static int available(int fd, jlong *bytes); 493 494 //File i/o operations 495 496 static size_t read(int fd, void *buf, unsigned int nBytes); 497 static size_t restartable_read(int fd, void *buf, unsigned int nBytes); 498 static size_t write(int fd, const void *buf, unsigned int nBytes); 499 500 // Reading directories. 501 static DIR* opendir(const char* dirname); 502 static int readdir_buf_size(const char *path); 503 static struct dirent* readdir(DIR* dirp, dirent* dbuf); 504 static int closedir(DIR* dirp); 505 506 // Dynamic library extension 507 static const char* dll_file_extension(); 508 509 static const char* get_temp_directory(); 510 static const char* get_current_directory(char *buf, size_t buflen); 511 512 // Builds a platform-specific full library path given a ld path and lib name 513 // Returns true if buffer contains full path to existing file, false otherwise 514 static bool dll_build_name(char* buffer, size_t size, 515 const char* pathname, const char* fname); 516 517 // Symbol lookup, find nearest function name; basically it implements 518 // dladdr() for all platforms. Name of the nearest function is copied 519 // to buf. Distance from its base address is optionally returned as offset. 520 // If function name is not found, buf[0] is set to '\0' and offset is 521 // set to -1 (if offset is non-NULL). 522 static bool dll_address_to_function_name(address addr, char* buf, 523 int buflen, int* offset); 524 525 // Locate DLL/DSO. On success, full path of the library is copied to 526 // buf, and offset is optionally set to be the distance between addr 527 // and the library's base address. On failure, buf[0] is set to '\0' 528 // and offset is set to -1 (if offset is non-NULL). 529 static bool dll_address_to_library_name(address addr, char* buf, 530 int buflen, int* offset); 531 532 // Find out whether the pc is in the static code for jvm.dll/libjvm.so. 533 static bool address_is_in_vm(address addr); 534 535 // Loads .dll/.so and 536 // in case of error it checks if .dll/.so was built for the 537 // same architecture as Hotspot is running on 538 static void* dll_load(const char *name, char *ebuf, int ebuflen); 539 540 // lookup symbol in a shared library 541 static void* dll_lookup(void* handle, const char* name); 542 543 // Unload library 544 static void dll_unload(void *lib); 545 546 // Return the handle of this process 547 static void* get_default_process_handle(); 548 549 // Check for static linked agent library 550 static bool find_builtin_agent(AgentLibrary *agent_lib, const char *syms[], 551 size_t syms_len); 552 553 // Find agent entry point 554 static void *find_agent_function(AgentLibrary *agent_lib, bool check_lib, 555 const char *syms[], size_t syms_len); 556 557 // Print out system information; they are called by fatal error handler. 558 // Output format may be different on different platforms. 559 static void print_os_info(outputStream* st); 560 static void print_os_info_brief(outputStream* st); 561 static void print_cpu_info(outputStream* st); 562 static void pd_print_cpu_info(outputStream* st); 563 static void print_memory_info(outputStream* st); 564 static void print_dll_info(outputStream* st); 565 static void print_environment_variables(outputStream* st, const char** env_list, char* buffer, int len); 566 static void print_context(outputStream* st, void* context); 567 static void print_register_info(outputStream* st, void* context); 568 static void print_siginfo(outputStream* st, void* siginfo); 569 static void print_signal_handlers(outputStream* st, char* buf, size_t buflen); 570 static void print_date_and_time(outputStream* st); 571 572 static void print_location(outputStream* st, intptr_t x, bool verbose = false); 573 static size_t lasterror(char *buf, size_t len); 574 static int get_last_error(); 575 576 // Determines whether the calling process is being debugged by a user-mode debugger. 577 static bool is_debugger_attached(); 578 579 // wait for a key press if PauseAtExit is set 580 static void wait_for_keypress_at_exit(void); 581 582 // The following two functions are used by fatal error handler to trace 583 // native (C) frames. They are not part of frame.hpp/frame.cpp because 584 // frame.hpp/cpp assume thread is JavaThread, and also because different 585 // OS/compiler may have different convention or provide different API to 586 // walk C frames. 587 // 588 // We don't attempt to become a debugger, so we only follow frames if that 589 // does not require a lookup in the unwind table, which is part of the binary 590 // file but may be unsafe to read after a fatal error. So on x86, we can 591 // only walk stack if %ebp is used as frame pointer; on ia64, it's not 592 // possible to walk C stack without having the unwind table. 593 static bool is_first_C_frame(frame *fr); 594 static frame get_sender_for_C_frame(frame *fr); 595 596 // return current frame. pc() and sp() are set to NULL on failure. 597 static frame current_frame(); 598 599 static void print_hex_dump(outputStream* st, address start, address end, int unitsize); 600 601 // returns a string to describe the exception/signal; 602 // returns NULL if exception_code is not an OS exception/signal. 603 static const char* exception_name(int exception_code, char* buf, size_t buflen); 604 605 // Returns native Java library, loads if necessary 606 static void* native_java_library(); 607 608 // Fills in path to jvm.dll/libjvm.so (used by the Disassembler) 609 static void jvm_path(char *buf, jint buflen); 610 611 // Returns true if we are running in a headless jre. 612 static bool is_headless_jre(); 613 614 // JNI names 615 static void print_jni_name_prefix_on(outputStream* st, int args_size); 616 static void print_jni_name_suffix_on(outputStream* st, int args_size); 617 618 // File conventions 619 static const char* file_separator(); 620 static const char* line_separator(); 621 static const char* path_separator(); 622 623 // Init os specific system properties values 624 static void init_system_properties_values(); 625 626 // IO operations, non-JVM_ version. 627 static int stat(const char* path, struct stat* sbuf); 628 static bool dir_is_empty(const char* path); 629 630 // IO operations on binary files 631 static int create_binary_file(const char* path, bool rewrite_existing); 632 static jlong current_file_offset(int fd); 633 static jlong seek_to_file_offset(int fd, jlong offset); 634 635 // Thread Local Storage 636 static int allocate_thread_local_storage(); 637 static void thread_local_storage_at_put(int index, void* value); 638 static void* thread_local_storage_at(int index); 639 static void free_thread_local_storage(int index); 640 641 // Stack walk 642 static address get_caller_pc(int n = 0); 643 644 // General allocation (must be MT-safe) 645 static void* malloc (size_t size, MEMFLAGS flags, address caller_pc = 0); 646 static void* realloc (void *memblock, size_t size, MEMFLAGS flags, address caller_pc = 0); 647 static void free (void *memblock, MEMFLAGS flags = mtNone); 648 static bool check_heap(bool force = false); // verify C heap integrity 649 static char* strdup(const char *, MEMFLAGS flags = mtInternal); // Like strdup 650 651#ifndef PRODUCT 652 static julong num_mallocs; // # of calls to malloc/realloc 653 static julong alloc_bytes; // # of bytes allocated 654 static julong num_frees; // # of calls to free 655 static julong free_bytes; // # of bytes freed 656#endif 657 658 // SocketInterface (ex HPI SocketInterface ) 659 static int socket(int domain, int type, int protocol); 660 static int socket_close(int fd); 661 static int socket_shutdown(int fd, int howto); 662 static int recv(int fd, char* buf, size_t nBytes, uint flags); 663 static int send(int fd, char* buf, size_t nBytes, uint flags); 664 static int raw_send(int fd, char* buf, size_t nBytes, uint flags); 665 static int timeout(int fd, long timeout); 666 static int listen(int fd, int count); 667 static int connect(int fd, struct sockaddr* him, socklen_t len); 668 static int bind(int fd, struct sockaddr* him, socklen_t len); 669 static int accept(int fd, struct sockaddr* him, socklen_t* len); 670 static int recvfrom(int fd, char* buf, size_t nbytes, uint flags, 671 struct sockaddr* from, socklen_t* fromlen); 672 static int get_sock_name(int fd, struct sockaddr* him, socklen_t* len); 673 static int sendto(int fd, char* buf, size_t len, uint flags, 674 struct sockaddr* to, socklen_t tolen); 675 static int socket_available(int fd, jint* pbytes); 676 677 static int get_sock_opt(int fd, int level, int optname, 678 char* optval, socklen_t* optlen); 679 static int set_sock_opt(int fd, int level, int optname, 680 const char* optval, socklen_t optlen); 681 static int get_host_name(char* name, int namelen); 682 683 static struct hostent* get_host_by_name(char* name); 684 685 // Support for signals (see JVM_RaiseSignal, JVM_RegisterSignal) 686 static void signal_init(); 687 static void signal_init_pd(); 688 static void signal_notify(int signal_number); 689 static void* signal(int signal_number, void* handler); 690 static void signal_raise(int signal_number); 691 static int signal_wait(); 692 static int signal_lookup(); 693 static void* user_handler(); 694 static void terminate_signal_thread(); 695 static int sigexitnum_pd(); 696 697 // random number generation 698 static long random(); // return 32bit pseudorandom number 699 static void init_random(long initval); // initialize random sequence 700 701 // Structured OS Exception support 702 static void os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread); 703 704 // On Windows this will create an actual minidump, on Linux/Solaris it will simply check core dump limits 705 static void check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize); 706 707 // Get the default path to the core file 708 // Returns the length of the string 709 static int get_core_path(char* buffer, size_t bufferSize); 710 711 // JVMTI & JVM monitoring and management support 712 // The thread_cpu_time() and current_thread_cpu_time() are only 713 // supported if is_thread_cpu_time_supported() returns true. 714 // They are not supported on Solaris T1. 715 716 // Thread CPU Time - return the fast estimate on a platform 717 // On Solaris - call gethrvtime (fast) - user time only 718 // On Linux - fast clock_gettime where available - user+sys 719 // - otherwise: very slow /proc fs - user+sys 720 // On Windows - GetThreadTimes - user+sys 721 static jlong current_thread_cpu_time(); 722 static jlong thread_cpu_time(Thread* t); 723 724 // Thread CPU Time with user_sys_cpu_time parameter. 725 // 726 // If user_sys_cpu_time is true, user+sys time is returned. 727 // Otherwise, only user time is returned 728 static jlong current_thread_cpu_time(bool user_sys_cpu_time); 729 static jlong thread_cpu_time(Thread* t, bool user_sys_cpu_time); 730 731 // Return a bunch of info about the timers. 732 // Note that the returned info for these two functions may be different 733 // on some platforms 734 static void current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr); 735 static void thread_cpu_time_info(jvmtiTimerInfo *info_ptr); 736 737 static bool is_thread_cpu_time_supported(); 738 739 // System loadavg support. Returns -1 if load average cannot be obtained. 740 static int loadavg(double loadavg[], int nelem); 741 742 // Hook for os specific jvm options that we don't want to abort on seeing 743 static bool obsolete_option(const JavaVMOption *option); 744 745 // Read file line by line. If line is longer than bsize, 746 // rest of line is skipped. Returns number of bytes read or -1 on EOF 747 static int get_line_chars(int fd, char *buf, const size_t bsize); 748 749 // Extensions 750#include "runtime/os_ext.hpp" 751 752 public: 753 class CrashProtectionCallback : public StackObj { 754 public: 755 virtual void call() = 0; 756 }; 757 758 // Platform dependent stuff 759#ifdef TARGET_OS_FAMILY_linux 760# include "os_linux.hpp" 761# include "os_posix.hpp" 762#endif 763#ifdef TARGET_OS_FAMILY_solaris 764# include "os_solaris.hpp" 765# include "os_posix.hpp" 766#endif 767#ifdef TARGET_OS_FAMILY_windows 768# include "os_windows.hpp" 769#endif 770#ifdef TARGET_OS_FAMILY_aix 771# include "os_aix.hpp" 772# include "os_posix.hpp" 773#endif 774#ifdef TARGET_OS_FAMILY_bsd 775# include "os_posix.hpp" 776# include "os_bsd.hpp" 777#endif 778#ifdef TARGET_OS_ARCH_linux_x86 779# include "os_linux_x86.hpp" 780#endif 781#ifdef TARGET_OS_ARCH_linux_sparc 782# include "os_linux_sparc.hpp" 783#endif 784#ifdef TARGET_OS_ARCH_linux_zero 785# include "os_linux_zero.hpp" 786#endif 787#ifdef TARGET_OS_ARCH_solaris_x86 788# include "os_solaris_x86.hpp" 789#endif 790#ifdef TARGET_OS_ARCH_solaris_sparc 791# include "os_solaris_sparc.hpp" 792#endif 793#ifdef TARGET_OS_ARCH_windows_x86 794# include "os_windows_x86.hpp" 795#endif 796#ifdef TARGET_OS_ARCH_linux_arm 797# include "os_linux_arm.hpp" 798#endif 799#ifdef TARGET_OS_ARCH_linux_ppc 800# include "os_linux_ppc.hpp" 801#endif 802#ifdef TARGET_OS_ARCH_aix_ppc 803# include "os_aix_ppc.hpp" 804#endif 805#ifdef TARGET_OS_ARCH_bsd_x86 806# include "os_bsd_x86.hpp" 807#endif 808#ifdef TARGET_OS_ARCH_bsd_zero 809# include "os_bsd_zero.hpp" 810#endif 811 812 public: 813 // debugging support (mostly used by debug.cpp but also fatal error handler) 814 static bool find(address pc, outputStream* st = tty); // OS specific function to make sense out of an address 815 816 static bool dont_yield(); // when true, JVM_Yield() is nop 817 static void print_statistics(); 818 819 // Thread priority helpers (implemented in OS-specific part) 820 static OSReturn set_native_priority(Thread* thread, int native_prio); 821 static OSReturn get_native_priority(const Thread* const thread, int* priority_ptr); 822 static int java_to_os_priority[CriticalPriority + 1]; 823 // Hint to the underlying OS that a task switch would not be good. 824 // Void return because it's a hint and can fail. 825 static void hint_no_preempt(); 826 827 // Used at creation if requested by the diagnostic flag PauseAtStartup. 828 // Causes the VM to wait until an external stimulus has been applied 829 // (for Unix, that stimulus is a signal, for Windows, an external 830 // ResumeThread call) 831 static void pause(); 832 833 // Builds a platform dependent Agent_OnLoad_<libname> function name 834 // which is used to find statically linked in agents. 835 static char* build_agent_function_name(const char *sym, const char *cname, 836 bool is_absolute_path); 837 838 class SuspendedThreadTaskContext { 839 public: 840 SuspendedThreadTaskContext(Thread* thread, void *ucontext) : _thread(thread), _ucontext(ucontext) {} 841 Thread* thread() const { return _thread; } 842 void* ucontext() const { return _ucontext; } 843 private: 844 Thread* _thread; 845 void* _ucontext; 846 }; 847 848 class SuspendedThreadTask { 849 public: 850 SuspendedThreadTask(Thread* thread) : _thread(thread), _done(false) {} 851 virtual ~SuspendedThreadTask() {} 852 void run(); 853 bool is_done() { return _done; } 854 virtual void do_task(const SuspendedThreadTaskContext& context) = 0; 855 protected: 856 private: 857 void internal_do_task(); 858 Thread* _thread; 859 bool _done; 860 }; 861 862#ifndef TARGET_OS_FAMILY_windows 863 // Suspend/resume support 864 // Protocol: 865 // 866 // a thread starts in SR_RUNNING 867 // 868 // SR_RUNNING can go to 869 // * SR_SUSPEND_REQUEST when the WatcherThread wants to suspend it 870 // SR_SUSPEND_REQUEST can go to 871 // * SR_RUNNING if WatcherThread decides it waited for SR_SUSPENDED too long (timeout) 872 // * SR_SUSPENDED if the stopped thread receives the signal and switches state 873 // SR_SUSPENDED can go to 874 // * SR_WAKEUP_REQUEST when the WatcherThread has done the work and wants to resume 875 // SR_WAKEUP_REQUEST can go to 876 // * SR_RUNNING when the stopped thread receives the signal 877 // * SR_WAKEUP_REQUEST on timeout (resend the signal and try again) 878 class SuspendResume { 879 public: 880 enum State { 881 SR_RUNNING, 882 SR_SUSPEND_REQUEST, 883 SR_SUSPENDED, 884 SR_WAKEUP_REQUEST 885 }; 886 887 private: 888 volatile State _state; 889 890 private: 891 /* try to switch state from state "from" to state "to" 892 * returns the state set after the method is complete 893 */ 894 State switch_state(State from, State to); 895 896 public: 897 SuspendResume() : _state(SR_RUNNING) { } 898 899 State state() const { return _state; } 900 901 State request_suspend() { 902 return switch_state(SR_RUNNING, SR_SUSPEND_REQUEST); 903 } 904 905 State cancel_suspend() { 906 return switch_state(SR_SUSPEND_REQUEST, SR_RUNNING); 907 } 908 909 State suspended() { 910 return switch_state(SR_SUSPEND_REQUEST, SR_SUSPENDED); 911 } 912 913 State request_wakeup() { 914 return switch_state(SR_SUSPENDED, SR_WAKEUP_REQUEST); 915 } 916 917 State running() { 918 return switch_state(SR_WAKEUP_REQUEST, SR_RUNNING); 919 } 920 921 bool is_running() const { 922 return _state == SR_RUNNING; 923 } 924 925 bool is_suspend_request() const { 926 return _state == SR_SUSPEND_REQUEST; 927 } 928 929 bool is_suspended() const { 930 return _state == SR_SUSPENDED; 931 } 932 }; 933#endif 934 935 936 protected: 937 static long _rand_seed; // seed for random number generator 938 static int _processor_count; // number of processors 939 940 static char* format_boot_path(const char* format_string, 941 const char* home, 942 int home_len, 943 char fileSep, 944 char pathSep); 945 static bool set_boot_path(char fileSep, char pathSep); 946 static char** split_path(const char* path, int* n); 947 948}; 949 950// Note that "PAUSE" is almost always used with synchronization 951// so arguably we should provide Atomic::SpinPause() instead 952// of the global SpinPause() with C linkage. 953// It'd also be eligible for inlining on many platforms. 954 955extern "C" int SpinPause(); 956 957#endif // SHARE_VM_RUNTIME_OS_HPP 958