os.hpp revision 196:d1605aabd0a1
155714Skris/* 255714Skris * Copyright 1997-2008 Sun Microsystems, Inc. All Rights Reserved. 355714Skris * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 455714Skris * 555714Skris * This code is free software; you can redistribute it and/or modify it 655714Skris * under the terms of the GNU General Public License version 2 only, as 755714Skris * published by the Free Software Foundation. 8296465Sdelphij * 955714Skris * This code is distributed in the hope that it will be useful, but WITHOUT 1055714Skris * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 1155714Skris * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 1255714Skris * version 2 for more details (a copy is included in the LICENSE file that 1355714Skris * accompanied this code). 1455714Skris * 15296465Sdelphij * You should have received a copy of the GNU General Public License version 1655714Skris * 2 along with this work; if not, write to the Free Software Foundation, 1755714Skris * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 1855714Skris * 1955714Skris * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 2055714Skris * CA 95054 USA or visit www.sun.com if you need additional information or 2155714Skris * have any questions. 22296465Sdelphij * 2355714Skris */ 2455714Skris 2555714Skris// os defines the interface to operating system; this includes traditional 2655714Skris// OS services (time, I/O) as well as other functionality with system- 2755714Skris// dependent code. 2855714Skris 2955714Skristypedef void (*dll_func)(...); 3055714Skris 3155714Skrisclass Thread; 3255714Skrisclass JavaThread; 3355714Skrisclass Event; 3455714Skrisclass DLL; 3555714Skrisclass FileHandle; 3655714Skristemplate<class E> class GrowableArray; 37296465Sdelphij 3855714Skris// %%%%% Moved ThreadState, START_FN, OSThread to new osThread.hpp. -- Rose 3955714Skris 40296465Sdelphij// Platform-independent error return values from OS functions 4155714Skrisenum OSReturn { 4255714Skris OS_OK = 0, // Operation was successful 4355714Skris OS_ERR = -1, // Operation failed 4455714Skris OS_INTRPT = -2, // Operation was interrupted 4555714Skris OS_TIMEOUT = -3, // Operation timed out 4655714Skris OS_NOMEM = -5, // Operation failed for lack of memory 4755714Skris OS_NORESOURCE = -6 // Operation failed for lack of nonmemory resource 4855714Skris}; 4955714Skris 5055714Skrisenum ThreadPriority { // JLS 20.20.1-3 5155714Skris NoPriority = -1, // Initial non-priority value 52296465Sdelphij MinPriority = 1, // Minimum priority 5355714Skris NormPriority = 5, // Normal (non-daemon) priority 5455714Skris NearMaxPriority = 9, // High priority, used for VMThread 5555714Skris MaxPriority = 10 // Highest priority, used for WatcherThread 5655714Skris // ensures that VMThread doesn't starve profiler 5755714Skris}; 5855714Skris 5955714Skris// Typedef for structured exception handling support 6055714Skristypedef void (*java_call_t)(JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread); 6155714Skris 62296465Sdelphijclass os: AllStatic { 63296465Sdelphij private: 64296465Sdelphij enum { page_sizes_max = 9 }; // Size of _page_sizes array (8 plus a sentinel) 65296465Sdelphij 6655714Skris static OSThread* _starting_thread; 6755714Skris static address _polling_page; 6855714Skris static volatile int32_t * _mem_serialize_page; 69296465Sdelphij static uintptr_t _serialize_page_mask; 7055714Skris static size_t _page_sizes[page_sizes_max]; 7155714Skris 7255714Skris static void init_page_sizes(size_t default_page_size) { 7359191Skris _page_sizes[0] = default_page_size; 74296465Sdelphij _page_sizes[1] = 0; // sentinel 7555714Skris } 76296465Sdelphij 77296465Sdelphij public: 7855714Skris 79296465Sdelphij static void init(void); // Called before command line parsing 80296465Sdelphij static jint init_2(void); // Called after command line parsing 81296465Sdelphij 82296465Sdelphij // File names are case-insensitive on windows only 8355714Skris // Override me as needed 84296465Sdelphij static int file_name_strcmp(const char* s1, const char* s2); 85296465Sdelphij 86296465Sdelphij static bool getenv(const char* name, char* buffer, int len); 87296465Sdelphij static bool have_special_privileges(); 88296465Sdelphij 89296465Sdelphij static jlong javaTimeMillis(); 90296465Sdelphij static jlong javaTimeNanos(); 91296465Sdelphij static void javaTimeNanos_info(jvmtiTimerInfo *info_ptr); 92296465Sdelphij static void run_periodic_checks(); 93296465Sdelphij 94296465Sdelphij 95296465Sdelphij // Returns the elapsed time in seconds since the vm started. 96296465Sdelphij static double elapsedTime(); 97296465Sdelphij 98296465Sdelphij // Returns real time in seconds since an arbitrary point 99296465Sdelphij // in the past. 100296465Sdelphij static bool getTimesSecs(double* process_real_time, 101296465Sdelphij double* process_user_time, 102296465Sdelphij double* process_system_time); 103296465Sdelphij 104296465Sdelphij // Interface to the performance counter 105296465Sdelphij static jlong elapsed_counter(); 106296465Sdelphij static jlong elapsed_frequency(); 107296465Sdelphij 10855714Skris // Return current local time in a string (YYYY-MM-DD HH:MM:SS). 109296465Sdelphij // It is MT safe, but not async-safe, as reading time zone 110296465Sdelphij // information may require a lock on some platforms. 11155714Skris static char* local_time_string(char *buf, size_t buflen); 112296465Sdelphij // Fill in buffer with current local time as an ISO-8601 string. 11355714Skris // E.g., YYYY-MM-DDThh:mm:ss.mmm+zzzz. 114296465Sdelphij // Returns buffer, or NULL if it failed. 115296465Sdelphij static char* iso8601_time(char* buffer, size_t buffer_length); 116296465Sdelphij 11755714Skris // Interface for detecting multiprocessor system 118296465Sdelphij static inline bool is_MP() { 119296465Sdelphij assert(_processor_count > 0, "invalid processor count"); 120296465Sdelphij return _processor_count > 1; 121296465Sdelphij } 122296465Sdelphij static julong available_memory(); 123296465Sdelphij static julong physical_memory(); 124296465Sdelphij static julong allocatable_physical_memory(julong size); 125296465Sdelphij static bool is_server_class_machine(); 126296465Sdelphij 127296465Sdelphij // number of CPUs 128296465Sdelphij static int processor_count() { 129296465Sdelphij return _processor_count; 130296465Sdelphij } 131296465Sdelphij 132296465Sdelphij // Returns the number of CPUs this process is currently allowed to run on. 133296465Sdelphij // Note that on some OSes this can change dynamically. 134296465Sdelphij static int active_processor_count(); 135296465Sdelphij 136296465Sdelphij // Bind processes to processors. 137296465Sdelphij // This is a two step procedure: 138296465Sdelphij // first you generate a distribution of processes to processors, 139296465Sdelphij // then you bind processes according to that distribution. 140296465Sdelphij // Compute a distribution for number of processes to processors. 141296465Sdelphij // Stores the processor id's into the distribution array argument. 14255714Skris // Returns true if it worked, false if it didn't. 143296465Sdelphij static bool distribute_processes(uint length, uint* distribution); 144296465Sdelphij // Binds the current process to a processor. 14555714Skris // Returns true if it worked, false if it didn't. 146296465Sdelphij static bool bind_to_processor(uint processor_id); 14755714Skris 14855714Skris // Interface for stack banging (predetect possible stack overflow for 14955714Skris // exception processing) There are guard pages, and above that shadow 15059191Skris // pages for stack overflow checking. 151296465Sdelphij static bool uses_stack_guard_pages(); 152296465Sdelphij static bool allocate_stack_guard_pages(); 153296465Sdelphij static void bang_stack_shadow_pages(); 154296465Sdelphij static bool stack_shadow_pages_available(Thread *thread, methodHandle method); 15555714Skris 156296465Sdelphij // OS interface to Virtual Memory 157296465Sdelphij 158296465Sdelphij // Return the default page size. 159296465Sdelphij static int vm_page_size(); 16055714Skris 161296465Sdelphij // Return the page size to use for a region of memory. The min_pages argument 162296465Sdelphij // is a hint intended to limit fragmentation; it says the returned page size 163296465Sdelphij // should be <= region_max_size / min_pages. Because min_pages is a hint, 164296465Sdelphij // this routine may return a size larger than region_max_size / min_pages. 165296465Sdelphij // 166296465Sdelphij // The current implementation ignores min_pages if a larger page size is an 167296465Sdelphij // exact multiple of both region_min_size and region_max_size. This allows 168296465Sdelphij // larger pages to be used when doing so would not cause fragmentation; in 169296465Sdelphij // particular, a single page can be used when region_min_size == 170296465Sdelphij // region_max_size == a supported page size. 171296465Sdelphij static size_t page_size_for_region(size_t region_min_size, 172296465Sdelphij size_t region_max_size, 173296465Sdelphij uint min_pages); 174296465Sdelphij 175296465Sdelphij // Method for tracing page sizes returned by the above method; enabled by 176296465Sdelphij // TracePageSizes. The region_{min,max}_size parameters should be the values 177296465Sdelphij // passed to page_size_for_region() and page_size should be the result of that 178296465Sdelphij // call. The (optional) base and size parameters should come from the 179296465Sdelphij // ReservedSpace base() and size() methods. 180296465Sdelphij static void trace_page_sizes(const char* str, const size_t region_min_size, 181296465Sdelphij const size_t region_max_size, 182296465Sdelphij const size_t page_size, 183296465Sdelphij const char* base = NULL, 184296465Sdelphij const size_t size = 0) PRODUCT_RETURN; 18555714Skris 186296465Sdelphij static int vm_allocation_granularity(); 187296465Sdelphij static char* reserve_memory(size_t bytes, char* addr = 0, 188296465Sdelphij size_t alignment_hint = 0); 189296465Sdelphij static char* attempt_reserve_memory_at(size_t bytes, char* addr); 19055714Skris static void split_reserved_memory(char *base, size_t size, 191296465Sdelphij size_t split, bool realloc); 192296465Sdelphij static bool commit_memory(char* addr, size_t bytes); 193296465Sdelphij static bool commit_memory(char* addr, size_t size, size_t alignment_hint); 19455714Skris static bool uncommit_memory(char* addr, size_t bytes); 195296465Sdelphij static bool release_memory(char* addr, size_t bytes); 196296465Sdelphij static bool protect_memory(char* addr, size_t bytes); 197296465Sdelphij static bool guard_memory(char* addr, size_t bytes); 198296465Sdelphij static bool unguard_memory(char* addr, size_t bytes); 199296465Sdelphij static char* map_memory(int fd, const char* file_name, size_t file_offset, 200296465Sdelphij char *addr, size_t bytes, bool read_only = false, 201296465Sdelphij bool allow_exec = false); 202296465Sdelphij static char* remap_memory(int fd, const char* file_name, size_t file_offset, 203296465Sdelphij char *addr, size_t bytes, bool read_only, 204296465Sdelphij bool allow_exec); 205296465Sdelphij static bool unmap_memory(char *addr, size_t bytes); 206296465Sdelphij static void free_memory(char *addr, size_t bytes); 207296465Sdelphij static void realign_memory(char *addr, size_t bytes, size_t alignment_hint); 208296465Sdelphij 209296465Sdelphij // NUMA-specific interface 210296465Sdelphij static bool numa_has_static_binding(); 211296465Sdelphij static bool numa_has_group_homing(); 212296465Sdelphij static void numa_make_local(char *addr, size_t bytes, int lgrp_hint); 213296465Sdelphij static void numa_make_global(char *addr, size_t bytes); 214296465Sdelphij static size_t numa_get_groups_num(); 215296465Sdelphij static size_t numa_get_leaf_groups(int *ids, size_t size); 216296465Sdelphij static bool numa_topology_changed(); 217296465Sdelphij static int numa_get_group_id(); 218296465Sdelphij 21955714Skris // Page manipulation 220296465Sdelphij struct page_info { 221296465Sdelphij size_t size; 222296465Sdelphij int lgrp_id; 223296465Sdelphij }; 22455714Skris static bool get_page_info(char *start, page_info* info); 22559191Skris static char* scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found); 226296465Sdelphij 227296465Sdelphij static char* non_memory_address_word(); 228296465Sdelphij // reserve, commit and pin the entire memory region 229296465Sdelphij static char* reserve_memory_special(size_t size); 230296465Sdelphij static bool release_memory_special(char* addr, size_t bytes); 231296465Sdelphij static bool large_page_init(); 23255714Skris static size_t large_page_size(); 233296465Sdelphij static bool can_commit_large_page_memory(); 234296465Sdelphij static bool can_execute_large_page_memory(); 235296465Sdelphij 236296465Sdelphij // OS interface to polling page 237296465Sdelphij static address get_polling_page() { return _polling_page; } 238296465Sdelphij static void set_polling_page(address page) { _polling_page = page; } 239296465Sdelphij static bool is_poll_address(address addr) { return addr >= _polling_page && addr < (_polling_page + os::vm_page_size()); } 240296465Sdelphij static void make_polling_page_unreadable(); 241296465Sdelphij static void make_polling_page_readable(); 242296465Sdelphij 243296465Sdelphij // Routines used to serialize the thread state without using membars 244296465Sdelphij static void serialize_thread_states(); 245296465Sdelphij 246296465Sdelphij // Since we write to the serialize page from every thread, we 247296465Sdelphij // want stores to be on unique cache lines whenever possible 248296465Sdelphij // in order to minimize CPU cross talk. We pre-compute the 249296465Sdelphij // amount to shift the thread* to make this offset unique to 250296465Sdelphij // each thread. 251296465Sdelphij static int get_serialize_page_shift_count() { 252296465Sdelphij return SerializePageShiftCount; 253296465Sdelphij } 254296465Sdelphij 255296465Sdelphij static void set_serialize_page_mask(uintptr_t mask) { 256296465Sdelphij _serialize_page_mask = mask; 257296465Sdelphij } 258296465Sdelphij 259296465Sdelphij static unsigned int get_serialize_page_mask() { 260296465Sdelphij return _serialize_page_mask; 261296465Sdelphij } 262296465Sdelphij 263296465Sdelphij static void set_memory_serialize_page(address page); 264296465Sdelphij 265296465Sdelphij static address get_memory_serialize_page() { 266296465Sdelphij return (address)_mem_serialize_page; 267296465Sdelphij } 268296465Sdelphij 269296465Sdelphij static inline void write_memory_serialize_page(JavaThread *thread) { 270296465Sdelphij uintptr_t page_offset = ((uintptr_t)thread >> 271296465Sdelphij get_serialize_page_shift_count()) & 272296465Sdelphij get_serialize_page_mask(); 273296465Sdelphij *(volatile int32_t *)((uintptr_t)_mem_serialize_page+page_offset) = 1; 274296465Sdelphij } 275296465Sdelphij 276296465Sdelphij static bool is_memory_serialize_page(JavaThread *thread, address addr) { 277296465Sdelphij address thr_addr; 278296465Sdelphij if (UseMembar) return false; 279296465Sdelphij // Calculate thread specific address 280296465Sdelphij if (thread == NULL) return false; 281296465Sdelphij // TODO-FIXME: some platforms mask off faulting addresses to the base pagesize. 282296465Sdelphij // Instead of using a test for equality we should probably use something 283296465Sdelphij // of the form: 284296465Sdelphij // return ((_mem_serialize_page ^ addr) & -pagesize) == 0 285296465Sdelphij // 286296465Sdelphij thr_addr = (address)(((uintptr_t)thread >> 287296465Sdelphij get_serialize_page_shift_count()) & 288296465Sdelphij get_serialize_page_mask()) + (uintptr_t)_mem_serialize_page; 289296465Sdelphij return (thr_addr == addr); 290296465Sdelphij } 291296465Sdelphij 292296465Sdelphij static void block_on_serialize_page_trap(); 293296465Sdelphij 294296465Sdelphij // threads 295296465Sdelphij 296296465Sdelphij enum ThreadType { 297296465Sdelphij vm_thread, 298296465Sdelphij cgc_thread, // Concurrent GC thread 29955714Skris pgc_thread, // Parallel GC thread 30055714Skris java_thread, 301 compiler_thread, 302 watcher_thread 303 }; 304 305 static bool create_thread(Thread* thread, 306 ThreadType thr_type, 307 size_t stack_size = 0); 308 static bool create_main_thread(JavaThread* thread); 309 static bool create_attached_thread(JavaThread* thread); 310 static void pd_start_thread(Thread* thread); 311 static void start_thread(Thread* thread); 312 313 static void initialize_thread(); 314 static void free_thread(OSThread* osthread); 315 316 // thread id on Linux/64bit is 64bit, on Windows and Solaris, it's 32bit 317 static intx current_thread_id(); 318 static int current_process_id(); 319 // hpi::read for calls from non native state 320 // For performance, hpi::read is only callable from _thread_in_native 321 static size_t read(int fd, void *buf, unsigned int nBytes); 322 static int sleep(Thread* thread, jlong ms, bool interruptable); 323 static int naked_sleep(); 324 static void infinite_sleep(); // never returns, use with CAUTION 325 static void yield(); // Yields to all threads with same priority 326 enum YieldResult { 327 YIELD_SWITCHED = 1, // caller descheduled, other ready threads exist & ran 328 YIELD_NONEREADY = 0, // No other runnable/ready threads. 329 // platform-specific yield return immediately 330 YIELD_UNKNOWN = -1 // Unknown: platform doesn't support _SWITCHED or _NONEREADY 331 // YIELD_SWITCHED and YIELD_NONREADY imply the platform supports a "strong" 332 // yield that can be used in lieu of blocking. 333 } ; 334 static YieldResult NakedYield () ; 335 static void yield_all(int attempts = 0); // Yields to all other threads including lower priority 336 static void loop_breaker(int attempts); // called from within tight loops to possibly influence time-sharing 337 static OSReturn set_priority(Thread* thread, ThreadPriority priority); 338 static OSReturn get_priority(const Thread* const thread, ThreadPriority& priority); 339 340 static void interrupt(Thread* thread); 341 static bool is_interrupted(Thread* thread, bool clear_interrupted); 342 343 static int pd_self_suspend_thread(Thread* thread); 344 345 static ExtendedPC fetch_frame_from_context(void* ucVoid, intptr_t** sp, intptr_t** fp); 346 static frame fetch_frame_from_context(void* ucVoid); 347 348 static ExtendedPC get_thread_pc(Thread *thread); 349 static void breakpoint(); 350 351 static address current_stack_pointer(); 352 static address current_stack_base(); 353 static size_t current_stack_size(); 354 355 static int message_box(const char* title, const char* message); 356 static char* do_you_want_to_debug(const char* message); 357 358 // run cmd in a separate process and return its exit code; or -1 on failures 359 static int fork_and_exec(char *cmd); 360 361 // Set file to send error reports. 362 static void set_error_file(const char *logfile); 363 364 // os::exit() is merged with vm_exit() 365 // static void exit(int num); 366 367 // Terminate the VM, but don't exit the process 368 static void shutdown(); 369 370 // Terminate with an error. Default is to generate a core file on platforms 371 // that support such things. This calls shutdown() and then aborts. 372 static void abort(bool dump_core = true); 373 374 // Die immediately, no exit hook, no abort hook, no cleanup. 375 static void die(); 376 377 // Reading directories. 378 static DIR* opendir(const char* dirname); 379 static int readdir_buf_size(const char *path); 380 static struct dirent* readdir(DIR* dirp, dirent* dbuf); 381 static int closedir(DIR* dirp); 382 383 // Dynamic library extension 384 static const char* dll_file_extension(); 385 386 static const char* get_temp_directory(); 387 static const char* get_current_directory(char *buf, int buflen); 388 389 // Symbol lookup, find nearest function name; basically it implements 390 // dladdr() for all platforms. Name of the nearest function is copied 391 // to buf. Distance from its base address is returned as offset. 392 // If function name is not found, buf[0] is set to '\0' and offset is 393 // set to -1. 394 static bool dll_address_to_function_name(address addr, char* buf, 395 int buflen, int* offset); 396 397 // Locate DLL/DSO. On success, full path of the library is copied to 398 // buf, and offset is set to be the distance between addr and the 399 // library's base address. On failure, buf[0] is set to '\0' and 400 // offset is set to -1. 401 static bool dll_address_to_library_name(address addr, char* buf, 402 int buflen, int* offset); 403 404 // Find out whether the pc is in the static code for jvm.dll/libjvm.so. 405 static bool address_is_in_vm(address addr); 406 407 // Loads .dll/.so and 408 // in case of error it checks if .dll/.so was built for the 409 // same architecture as Hotspot is running on 410 static void* dll_load(const char *name, char *ebuf, int ebuflen); 411 412 // Print out system information; they are called by fatal error handler. 413 // Output format may be different on different platforms. 414 static void print_os_info(outputStream* st); 415 static void print_cpu_info(outputStream* st); 416 static void print_memory_info(outputStream* st); 417 static void print_dll_info(outputStream* st); 418 static void print_environment_variables(outputStream* st, const char** env_list, char* buffer, int len); 419 static void print_context(outputStream* st, void* context); 420 static void print_siginfo(outputStream* st, void* siginfo); 421 static void print_signal_handlers(outputStream* st, char* buf, size_t buflen); 422 static void print_date_and_time(outputStream* st); 423 424 // The following two functions are used by fatal error handler to trace 425 // native (C) frames. They are not part of frame.hpp/frame.cpp because 426 // frame.hpp/cpp assume thread is JavaThread, and also because different 427 // OS/compiler may have different convention or provide different API to 428 // walk C frames. 429 // 430 // We don't attempt to become a debugger, so we only follow frames if that 431 // does not require a lookup in the unwind table, which is part of the binary 432 // file but may be unsafe to read after a fatal error. So on x86, we can 433 // only walk stack if %ebp is used as frame pointer; on ia64, it's not 434 // possible to walk C stack without having the unwind table. 435 static bool is_first_C_frame(frame *fr); 436 static frame get_sender_for_C_frame(frame *fr); 437 438 // return current frame. pc() and sp() are set to NULL on failure. 439 static frame current_frame(); 440 441 static void print_hex_dump(outputStream* st, address start, address end, int unitsize); 442 443 // returns a string to describe the exception/signal; 444 // returns NULL if exception_code is not an OS exception/signal. 445 static const char* exception_name(int exception_code, char* buf, size_t buflen); 446 447 // Returns native Java library, loads if necessary 448 static void* native_java_library(); 449 450 // Fills in path to jvm.dll/libjvm.so (this info used to find hpi). 451 static void jvm_path(char *buf, jint buflen); 452 453 // JNI names 454 static void print_jni_name_prefix_on(outputStream* st, int args_size); 455 static void print_jni_name_suffix_on(outputStream* st, int args_size); 456 457 // File conventions 458 static const char* file_separator(); 459 static const char* line_separator(); 460 static const char* path_separator(); 461 462 // Init os specific system properties values 463 static void init_system_properties_values(); 464 465 // IO operations, non-JVM_ version. 466 static int stat(const char* path, struct stat* sbuf); 467 static bool dir_is_empty(const char* path); 468 469 // IO operations on binary files 470 static int create_binary_file(const char* path, bool rewrite_existing); 471 static jlong current_file_offset(int fd); 472 static jlong seek_to_file_offset(int fd, jlong offset); 473 474 // Thread Local Storage 475 static int allocate_thread_local_storage(); 476 static void thread_local_storage_at_put(int index, void* value); 477 static void* thread_local_storage_at(int index); 478 static void free_thread_local_storage(int index); 479 480 // General allocation (must be MT-safe) 481 static void* malloc (size_t size); 482 static void* realloc (void *memblock, size_t size); 483 static void free (void *memblock); 484 static bool check_heap(bool force = false); // verify C heap integrity 485 static char* strdup(const char *); // Like strdup 486 487#ifndef PRODUCT 488 static int num_mallocs; // # of calls to malloc/realloc 489 static size_t alloc_bytes; // # of bytes allocated 490 static int num_frees; // # of calls to free 491#endif 492 493 // Printing 64 bit integers 494 static const char* jlong_format_specifier(); 495 static const char* julong_format_specifier(); 496 497 // Support for signals (see JVM_RaiseSignal, JVM_RegisterSignal) 498 static void signal_init(); 499 static void signal_init_pd(); 500 static void signal_notify(int signal_number); 501 static void* signal(int signal_number, void* handler); 502 static void signal_raise(int signal_number); 503 static int signal_wait(); 504 static int signal_lookup(); 505 static void* user_handler(); 506 static void terminate_signal_thread(); 507 static int sigexitnum_pd(); 508 509 // random number generation 510 static long random(); // return 32bit pseudorandom number 511 static void init_random(long initval); // initialize random sequence 512 513 // Structured OS Exception support 514 static void os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread); 515 516 // JVMTI & JVM monitoring and management support 517 // The thread_cpu_time() and current_thread_cpu_time() are only 518 // supported if is_thread_cpu_time_supported() returns true. 519 // They are not supported on Solaris T1. 520 521 // Thread CPU Time - return the fast estimate on a platform 522 // On Solaris - call gethrvtime (fast) - user time only 523 // On Linux - fast clock_gettime where available - user+sys 524 // - otherwise: very slow /proc fs - user+sys 525 // On Windows - GetThreadTimes - user+sys 526 static jlong current_thread_cpu_time(); 527 static jlong thread_cpu_time(Thread* t); 528 529 // Thread CPU Time with user_sys_cpu_time parameter. 530 // 531 // If user_sys_cpu_time is true, user+sys time is returned. 532 // Otherwise, only user time is returned 533 static jlong current_thread_cpu_time(bool user_sys_cpu_time); 534 static jlong thread_cpu_time(Thread* t, bool user_sys_cpu_time); 535 536 // Return a bunch of info about the timers. 537 // Note that the returned info for these two functions may be different 538 // on some platforms 539 static void current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr); 540 static void thread_cpu_time_info(jvmtiTimerInfo *info_ptr); 541 542 static bool is_thread_cpu_time_supported(); 543 544 // System loadavg support. Returns -1 if load average cannot be obtained. 545 static int loadavg(double loadavg[], int nelem); 546 547 // Hook for os specific jvm options that we don't want to abort on seeing 548 static bool obsolete_option(const JavaVMOption *option); 549 550 // Platform dependent stuff 551 #include "incls/_os_pd.hpp.incl" 552 553 // debugging support (mostly used by debug.cpp) 554 static bool find(address pc) PRODUCT_RETURN0; // OS specific function to make sense out of an address 555 556 static bool dont_yield(); // when true, JVM_Yield() is nop 557 static void print_statistics(); 558 559 // Thread priority helpers (implemented in OS-specific part) 560 static OSReturn set_native_priority(Thread* thread, int native_prio); 561 static OSReturn get_native_priority(const Thread* const thread, int* priority_ptr); 562 static int java_to_os_priority[MaxPriority + 1]; 563 // Hint to the underlying OS that a task switch would not be good. 564 // Void return because it's a hint and can fail. 565 static void hint_no_preempt(); 566 567 // Used at creation if requested by the diagnostic flag PauseAtStartup. 568 // Causes the VM to wait until an external stimulus has been applied 569 // (for Unix, that stimulus is a signal, for Windows, an external 570 // ResumeThread call) 571 static void pause(); 572 573 protected: 574 static long _rand_seed; // seed for random number generator 575 static int _processor_count; // number of processors 576 577 static char* format_boot_path(const char* format_string, 578 const char* home, 579 int home_len, 580 char fileSep, 581 char pathSep); 582 static bool set_boot_path(char fileSep, char pathSep); 583}; 584 585// Note that "PAUSE" is almost always used with synchronization 586// so arguably we should provide Atomic::SpinPause() instead 587// of the global SpinPause() with C linkage. 588// It'd also be eligible for inlining on many platforms. 589 590extern "C" int SpinPause () ; 591extern "C" int SafeFetch32 (int * adr, int errValue) ; 592extern "C" intptr_t SafeFetchN (intptr_t * adr, intptr_t errValue) ; 593