os.hpp revision 2622:24cee90e9453
1/* 2 * Copyright (c) 1997, 2011, 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#endif 36#ifdef TARGET_OS_FAMILY_solaris 37# include "jvm_solaris.h" 38#endif 39#ifdef TARGET_OS_FAMILY_windows 40# include "jvm_windows.h" 41#endif 42 43// os defines the interface to operating system; this includes traditional 44// OS services (time, I/O) as well as other functionality with system- 45// dependent code. 46 47typedef void (*dll_func)(...); 48 49class Thread; 50class JavaThread; 51class Event; 52class DLL; 53class FileHandle; 54template<class E> class GrowableArray; 55 56// %%%%% Moved ThreadState, START_FN, OSThread to new osThread.hpp. -- Rose 57 58// Platform-independent error return values from OS functions 59enum OSReturn { 60 OS_OK = 0, // Operation was successful 61 OS_ERR = -1, // Operation failed 62 OS_INTRPT = -2, // Operation was interrupted 63 OS_TIMEOUT = -3, // Operation timed out 64 OS_NOMEM = -5, // Operation failed for lack of memory 65 OS_NORESOURCE = -6 // Operation failed for lack of nonmemory resource 66}; 67 68enum ThreadPriority { // JLS 20.20.1-3 69 NoPriority = -1, // Initial non-priority value 70 MinPriority = 1, // Minimum priority 71 NormPriority = 5, // Normal (non-daemon) priority 72 NearMaxPriority = 9, // High priority, used for VMThread 73 MaxPriority = 10 // Highest priority, used for WatcherThread 74 // ensures that VMThread doesn't starve profiler 75}; 76 77// Typedef for structured exception handling support 78typedef void (*java_call_t)(JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread); 79 80class os: AllStatic { 81 public: 82 enum { page_sizes_max = 9 }; // Size of _page_sizes array (8 plus a sentinel) 83 84 private: 85 static OSThread* _starting_thread; 86 static address _polling_page; 87 static volatile int32_t * _mem_serialize_page; 88 static uintptr_t _serialize_page_mask; 89 public: 90 static size_t _page_sizes[page_sizes_max]; 91 92 private: 93 static void init_page_sizes(size_t default_page_size) { 94 _page_sizes[0] = default_page_size; 95 _page_sizes[1] = 0; // sentinel 96 } 97 98 public: 99 100 static void init(void); // Called before command line parsing 101 static jint init_2(void); // Called after command line parsing 102 static void init_3(void); // Called at the end of vm init 103 104 // File names are case-insensitive on windows only 105 // Override me as needed 106 static int file_name_strcmp(const char* s1, const char* s2); 107 108 static bool getenv(const char* name, char* buffer, int len); 109 static bool have_special_privileges(); 110 111 static jlong javaTimeMillis(); 112 static jlong javaTimeNanos(); 113 static void javaTimeNanos_info(jvmtiTimerInfo *info_ptr); 114 static void run_periodic_checks(); 115 116 117 // Returns the elapsed time in seconds since the vm started. 118 static double elapsedTime(); 119 120 // Returns real time in seconds since an arbitrary point 121 // in the past. 122 static bool getTimesSecs(double* process_real_time, 123 double* process_user_time, 124 double* process_system_time); 125 126 // Interface to the performance counter 127 static jlong elapsed_counter(); 128 static jlong elapsed_frequency(); 129 130 // The "virtual time" of a thread is the amount of time a thread has 131 // actually run. The first function indicates whether the OS supports 132 // this functionality for the current thread, and if so: 133 // * the second enables vtime tracking (if that is required). 134 // * the third tells whether vtime is enabled. 135 // * the fourth returns the elapsed virtual time for the current 136 // thread. 137 static bool supports_vtime(); 138 static bool enable_vtime(); 139 static bool vtime_enabled(); 140 static double elapsedVTime(); 141 142 // Return current local time in a string (YYYY-MM-DD HH:MM:SS). 143 // It is MT safe, but not async-safe, as reading time zone 144 // information may require a lock on some platforms. 145 static char* local_time_string(char *buf, size_t buflen); 146 static struct tm* localtime_pd (const time_t* clock, struct tm* res); 147 // Fill in buffer with current local time as an ISO-8601 string. 148 // E.g., YYYY-MM-DDThh:mm:ss.mmm+zzzz. 149 // Returns buffer, or NULL if it failed. 150 static char* iso8601_time(char* buffer, size_t buffer_length); 151 152 // Interface for detecting multiprocessor system 153 static inline bool is_MP() { 154 assert(_processor_count > 0, "invalid processor count"); 155 return _processor_count > 1; 156 } 157 static julong available_memory(); 158 static julong physical_memory(); 159 static julong allocatable_physical_memory(julong size); 160 static bool is_server_class_machine(); 161 162 // number of CPUs 163 static int processor_count() { 164 return _processor_count; 165 } 166 static void set_processor_count(int count) { _processor_count = count; } 167 168 // Returns the number of CPUs this process is currently allowed to run on. 169 // Note that on some OSes this can change dynamically. 170 static int active_processor_count(); 171 172 // Bind processes to processors. 173 // This is a two step procedure: 174 // first you generate a distribution of processes to processors, 175 // then you bind processes according to that distribution. 176 // Compute a distribution for number of processes to processors. 177 // Stores the processor id's into the distribution array argument. 178 // Returns true if it worked, false if it didn't. 179 static bool distribute_processes(uint length, uint* distribution); 180 // Binds the current process to a processor. 181 // Returns true if it worked, false if it didn't. 182 static bool bind_to_processor(uint processor_id); 183 184 // Interface for stack banging (predetect possible stack overflow for 185 // exception processing) There are guard pages, and above that shadow 186 // pages for stack overflow checking. 187 static bool uses_stack_guard_pages(); 188 static bool allocate_stack_guard_pages(); 189 static void bang_stack_shadow_pages(); 190 static bool stack_shadow_pages_available(Thread *thread, methodHandle method); 191 192 // OS interface to Virtual Memory 193 194 // Return the default page size. 195 static int vm_page_size(); 196 197 // Return the page size to use for a region of memory. The min_pages argument 198 // is a hint intended to limit fragmentation; it says the returned page size 199 // should be <= region_max_size / min_pages. Because min_pages is a hint, 200 // this routine may return a size larger than region_max_size / min_pages. 201 // 202 // The current implementation ignores min_pages if a larger page size is an 203 // exact multiple of both region_min_size and region_max_size. This allows 204 // larger pages to be used when doing so would not cause fragmentation; in 205 // particular, a single page can be used when region_min_size == 206 // region_max_size == a supported page size. 207 static size_t page_size_for_region(size_t region_min_size, 208 size_t region_max_size, 209 uint min_pages); 210 211 // Methods for tracing page sizes returned by the above method; enabled by 212 // TracePageSizes. The region_{min,max}_size parameters should be the values 213 // passed to page_size_for_region() and page_size should be the result of that 214 // call. The (optional) base and size parameters should come from the 215 // ReservedSpace base() and size() methods. 216 static void trace_page_sizes(const char* str, const size_t* page_sizes, 217 int count) PRODUCT_RETURN; 218 static void trace_page_sizes(const char* str, const size_t region_min_size, 219 const size_t region_max_size, 220 const size_t page_size, 221 const char* base = NULL, 222 const size_t size = 0) PRODUCT_RETURN; 223 224 static int vm_allocation_granularity(); 225 static char* reserve_memory(size_t bytes, char* addr = 0, 226 size_t alignment_hint = 0); 227 static char* attempt_reserve_memory_at(size_t bytes, char* addr); 228 static void split_reserved_memory(char *base, size_t size, 229 size_t split, bool realloc); 230 static bool commit_memory(char* addr, size_t bytes, 231 bool executable = false); 232 static bool commit_memory(char* addr, size_t size, size_t alignment_hint, 233 bool executable = false); 234 static bool uncommit_memory(char* addr, size_t bytes); 235 static bool release_memory(char* addr, size_t bytes); 236 237 enum ProtType { MEM_PROT_NONE, MEM_PROT_READ, MEM_PROT_RW, MEM_PROT_RWX }; 238 static bool protect_memory(char* addr, size_t bytes, ProtType prot, 239 bool is_committed = true); 240 241 static bool guard_memory(char* addr, size_t bytes); 242 static bool unguard_memory(char* addr, size_t bytes); 243 static bool create_stack_guard_pages(char* addr, size_t bytes); 244 static bool remove_stack_guard_pages(char* addr, size_t bytes); 245 246 static char* map_memory(int fd, const char* file_name, size_t file_offset, 247 char *addr, size_t bytes, bool read_only = false, 248 bool allow_exec = false); 249 static char* remap_memory(int fd, const char* file_name, size_t file_offset, 250 char *addr, size_t bytes, bool read_only, 251 bool allow_exec); 252 static bool unmap_memory(char *addr, size_t bytes); 253 static void free_memory(char *addr, size_t bytes); 254 static void realign_memory(char *addr, size_t bytes, size_t alignment_hint); 255 256 // NUMA-specific interface 257 static bool numa_has_static_binding(); 258 static bool numa_has_group_homing(); 259 static void numa_make_local(char *addr, size_t bytes, int lgrp_hint); 260 static void numa_make_global(char *addr, size_t bytes); 261 static size_t numa_get_groups_num(); 262 static size_t numa_get_leaf_groups(int *ids, size_t size); 263 static bool numa_topology_changed(); 264 static int numa_get_group_id(); 265 266 // Page manipulation 267 struct page_info { 268 size_t size; 269 int lgrp_id; 270 }; 271 static bool get_page_info(char *start, page_info* info); 272 static char* scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found); 273 274 static char* non_memory_address_word(); 275 // reserve, commit and pin the entire memory region 276 static char* reserve_memory_special(size_t size, char* addr = NULL, 277 bool executable = false); 278 static bool release_memory_special(char* addr, size_t bytes); 279 static void large_page_init(); 280 static size_t large_page_size(); 281 static bool can_commit_large_page_memory(); 282 static bool can_execute_large_page_memory(); 283 284 // OS interface to polling page 285 static address get_polling_page() { return _polling_page; } 286 static void set_polling_page(address page) { _polling_page = page; } 287 static bool is_poll_address(address addr) { return addr >= _polling_page && addr < (_polling_page + os::vm_page_size()); } 288 static void make_polling_page_unreadable(); 289 static void make_polling_page_readable(); 290 291 // Routines used to serialize the thread state without using membars 292 static void serialize_thread_states(); 293 294 // Since we write to the serialize page from every thread, we 295 // want stores to be on unique cache lines whenever possible 296 // in order to minimize CPU cross talk. We pre-compute the 297 // amount to shift the thread* to make this offset unique to 298 // each thread. 299 static int get_serialize_page_shift_count() { 300 return SerializePageShiftCount; 301 } 302 303 static void set_serialize_page_mask(uintptr_t mask) { 304 _serialize_page_mask = mask; 305 } 306 307 static unsigned int get_serialize_page_mask() { 308 return _serialize_page_mask; 309 } 310 311 static void set_memory_serialize_page(address page); 312 313 static address get_memory_serialize_page() { 314 return (address)_mem_serialize_page; 315 } 316 317 static inline void write_memory_serialize_page(JavaThread *thread) { 318 uintptr_t page_offset = ((uintptr_t)thread >> 319 get_serialize_page_shift_count()) & 320 get_serialize_page_mask(); 321 *(volatile int32_t *)((uintptr_t)_mem_serialize_page+page_offset) = 1; 322 } 323 324 static bool is_memory_serialize_page(JavaThread *thread, address addr) { 325 if (UseMembar) return false; 326 // Previously this function calculated the exact address of this 327 // thread's serialize page, and checked if the faulting address 328 // was equal. However, some platforms mask off faulting addresses 329 // to the page size, so now we just check that the address is 330 // within the page. This makes the thread argument unnecessary, 331 // but we retain the NULL check to preserve existing behaviour. 332 if (thread == NULL) return false; 333 address page = (address) _mem_serialize_page; 334 return addr >= page && addr < (page + os::vm_page_size()); 335 } 336 337 static void block_on_serialize_page_trap(); 338 339 // threads 340 341 enum ThreadType { 342 vm_thread, 343 cgc_thread, // Concurrent GC thread 344 pgc_thread, // Parallel GC thread 345 java_thread, 346 compiler_thread, 347 watcher_thread, 348 os_thread 349 }; 350 351 static bool create_thread(Thread* thread, 352 ThreadType thr_type, 353 size_t stack_size = 0); 354 static bool create_main_thread(JavaThread* thread); 355 static bool create_attached_thread(JavaThread* thread); 356 static void pd_start_thread(Thread* thread); 357 static void start_thread(Thread* thread); 358 359 static void initialize_thread(); 360 static void free_thread(OSThread* osthread); 361 362 // thread id on Linux/64bit is 64bit, on Windows and Solaris, it's 32bit 363 static intx current_thread_id(); 364 static int current_process_id(); 365 static int sleep(Thread* thread, jlong ms, bool interruptable); 366 static int naked_sleep(); 367 static void infinite_sleep(); // never returns, use with CAUTION 368 static void yield(); // Yields to all threads with same priority 369 enum YieldResult { 370 YIELD_SWITCHED = 1, // caller descheduled, other ready threads exist & ran 371 YIELD_NONEREADY = 0, // No other runnable/ready threads. 372 // platform-specific yield return immediately 373 YIELD_UNKNOWN = -1 // Unknown: platform doesn't support _SWITCHED or _NONEREADY 374 // YIELD_SWITCHED and YIELD_NONREADY imply the platform supports a "strong" 375 // yield that can be used in lieu of blocking. 376 } ; 377 static YieldResult NakedYield () ; 378 static void yield_all(int attempts = 0); // Yields to all other threads including lower priority 379 static void loop_breaker(int attempts); // called from within tight loops to possibly influence time-sharing 380 static OSReturn set_priority(Thread* thread, ThreadPriority priority); 381 static OSReturn get_priority(const Thread* const thread, ThreadPriority& priority); 382 383 static void interrupt(Thread* thread); 384 static bool is_interrupted(Thread* thread, bool clear_interrupted); 385 386 static int pd_self_suspend_thread(Thread* thread); 387 388 static ExtendedPC fetch_frame_from_context(void* ucVoid, intptr_t** sp, intptr_t** fp); 389 static frame fetch_frame_from_context(void* ucVoid); 390 391 static ExtendedPC get_thread_pc(Thread *thread); 392 static void breakpoint(); 393 394 static address current_stack_pointer(); 395 static address current_stack_base(); 396 static size_t current_stack_size(); 397 398 static int message_box(const char* title, const char* message); 399 static char* do_you_want_to_debug(const char* message); 400 401 // run cmd in a separate process and return its exit code; or -1 on failures 402 static int fork_and_exec(char *cmd); 403 404 // Set file to send error reports. 405 static void set_error_file(const char *logfile); 406 407 // os::exit() is merged with vm_exit() 408 // static void exit(int num); 409 410 // Terminate the VM, but don't exit the process 411 static void shutdown(); 412 413 // Terminate with an error. Default is to generate a core file on platforms 414 // that support such things. This calls shutdown() and then aborts. 415 static void abort(bool dump_core = true); 416 417 // Die immediately, no exit hook, no abort hook, no cleanup. 418 static void die(); 419 420 // File i/o operations 421 static const int default_file_open_flags(); 422 static int open(const char *path, int oflag, int mode); 423 static int close(int fd); 424 static jlong lseek(int fd, jlong offset, int whence); 425 static char* native_path(char *path); 426 static int ftruncate(int fd, jlong length); 427 static int fsync(int fd); 428 static int available(int fd, jlong *bytes); 429 430 //File i/o operations 431 432 static size_t read(int fd, void *buf, unsigned int nBytes); 433 static size_t restartable_read(int fd, void *buf, unsigned int nBytes); 434 static size_t write(int fd, const void *buf, unsigned int nBytes); 435 436 // Reading directories. 437 static DIR* opendir(const char* dirname); 438 static int readdir_buf_size(const char *path); 439 static struct dirent* readdir(DIR* dirp, dirent* dbuf); 440 static int closedir(DIR* dirp); 441 442 // Dynamic library extension 443 static const char* dll_file_extension(); 444 445 static const char* get_temp_directory(); 446 static const char* get_current_directory(char *buf, int buflen); 447 448 // Builds a platform-specific full library path given a ld path and lib name 449 static void dll_build_name(char* buffer, size_t size, 450 const char* pathname, const char* fname); 451 452 // Symbol lookup, find nearest function name; basically it implements 453 // dladdr() for all platforms. Name of the nearest function is copied 454 // to buf. Distance from its base address is returned as offset. 455 // If function name is not found, buf[0] is set to '\0' and offset is 456 // set to -1. 457 static bool dll_address_to_function_name(address addr, char* buf, 458 int buflen, int* offset); 459 460 // Locate DLL/DSO. On success, full path of the library is copied to 461 // buf, and offset is set to be the distance between addr and the 462 // library's base address. On failure, buf[0] is set to '\0' and 463 // offset is set to -1. 464 static bool dll_address_to_library_name(address addr, char* buf, 465 int buflen, int* offset); 466 467 // Find out whether the pc is in the static code for jvm.dll/libjvm.so. 468 static bool address_is_in_vm(address addr); 469 470 // Loads .dll/.so and 471 // in case of error it checks if .dll/.so was built for the 472 // same architecture as Hotspot is running on 473 static void* dll_load(const char *name, char *ebuf, int ebuflen); 474 475 // lookup symbol in a shared library 476 static void* dll_lookup(void* handle, const char* name); 477 478 // Unload library 479 static void dll_unload(void *lib); 480 481 // Print out system information; they are called by fatal error handler. 482 // Output format may be different on different platforms. 483 static void print_os_info(outputStream* st); 484 static void print_cpu_info(outputStream* st); 485 static void pd_print_cpu_info(outputStream* st); 486 static void print_memory_info(outputStream* st); 487 static void print_dll_info(outputStream* st); 488 static void print_environment_variables(outputStream* st, const char** env_list, char* buffer, int len); 489 static void print_context(outputStream* st, void* context); 490 static void print_register_info(outputStream* st, void* context); 491 static void print_siginfo(outputStream* st, void* siginfo); 492 static void print_signal_handlers(outputStream* st, char* buf, size_t buflen); 493 static void print_date_and_time(outputStream* st); 494 495 static void print_location(outputStream* st, intptr_t x, bool verbose = false); 496 static size_t lasterror(char *buf, size_t len); 497 498 // Determines whether the calling process is being debugged by a user-mode debugger. 499 static bool is_debugger_attached(); 500 501 // wait for a key press if PauseAtExit is set 502 static void wait_for_keypress_at_exit(void); 503 504 // The following two functions are used by fatal error handler to trace 505 // native (C) frames. They are not part of frame.hpp/frame.cpp because 506 // frame.hpp/cpp assume thread is JavaThread, and also because different 507 // OS/compiler may have different convention or provide different API to 508 // walk C frames. 509 // 510 // We don't attempt to become a debugger, so we only follow frames if that 511 // does not require a lookup in the unwind table, which is part of the binary 512 // file but may be unsafe to read after a fatal error. So on x86, we can 513 // only walk stack if %ebp is used as frame pointer; on ia64, it's not 514 // possible to walk C stack without having the unwind table. 515 static bool is_first_C_frame(frame *fr); 516 static frame get_sender_for_C_frame(frame *fr); 517 518 // return current frame. pc() and sp() are set to NULL on failure. 519 static frame current_frame(); 520 521 static void print_hex_dump(outputStream* st, address start, address end, int unitsize); 522 523 // returns a string to describe the exception/signal; 524 // returns NULL if exception_code is not an OS exception/signal. 525 static const char* exception_name(int exception_code, char* buf, size_t buflen); 526 527 // Returns native Java library, loads if necessary 528 static void* native_java_library(); 529 530 // Fills in path to jvm.dll/libjvm.so (used by the Disassembler) 531 static void jvm_path(char *buf, jint buflen); 532 533 // Returns true if we are running in a headless jre. 534 static bool is_headless_jre(); 535 536 // JNI names 537 static void print_jni_name_prefix_on(outputStream* st, int args_size); 538 static void print_jni_name_suffix_on(outputStream* st, int args_size); 539 540 // File conventions 541 static const char* file_separator(); 542 static const char* line_separator(); 543 static const char* path_separator(); 544 545 // Init os specific system properties values 546 static void init_system_properties_values(); 547 548 // IO operations, non-JVM_ version. 549 static int stat(const char* path, struct stat* sbuf); 550 static bool dir_is_empty(const char* path); 551 552 // IO operations on binary files 553 static int create_binary_file(const char* path, bool rewrite_existing); 554 static jlong current_file_offset(int fd); 555 static jlong seek_to_file_offset(int fd, jlong offset); 556 557 // Thread Local Storage 558 static int allocate_thread_local_storage(); 559 static void thread_local_storage_at_put(int index, void* value); 560 static void* thread_local_storage_at(int index); 561 static void free_thread_local_storage(int index); 562 563 // General allocation (must be MT-safe) 564 static void* malloc (size_t size); 565 static void* realloc (void *memblock, size_t size); 566 static void free (void *memblock); 567 static bool check_heap(bool force = false); // verify C heap integrity 568 static char* strdup(const char *); // Like strdup 569 570#ifndef PRODUCT 571 static julong num_mallocs; // # of calls to malloc/realloc 572 static julong alloc_bytes; // # of bytes allocated 573 static julong num_frees; // # of calls to free 574 static julong free_bytes; // # of bytes freed 575#endif 576 577 // SocketInterface (ex HPI SocketInterface ) 578 static int socket(int domain, int type, int protocol); 579 static int socket_close(int fd); 580 static int socket_shutdown(int fd, int howto); 581 static int recv(int fd, char *buf, int nBytes, int flags); 582 static int send(int fd, char *buf, int nBytes, int flags); 583 static int raw_send(int fd, char *buf, int nBytes, int flags); 584 static int timeout(int fd, long timeout); 585 static int listen(int fd, int count); 586 static int connect(int fd, struct sockaddr *him, int len); 587 static int bind(int fd, struct sockaddr *him, int len); 588 static int accept(int fd, struct sockaddr *him, int *len); 589 static int recvfrom(int fd, char *buf, int nbytes, int flags, 590 struct sockaddr *from, int *fromlen); 591 static int get_sock_name(int fd, struct sockaddr *him, int *len); 592 static int sendto(int fd, char *buf, int len, int flags, 593 struct sockaddr *to, int tolen); 594 static int socket_available(int fd, jint *pbytes); 595 596 static int get_sock_opt(int fd, int level, int optname, 597 char *optval, int* optlen); 598 static int set_sock_opt(int fd, int level, int optname, 599 const char *optval, int optlen); 600 static int get_host_name(char* name, int namelen); 601 602 static struct hostent* get_host_by_name(char* name); 603 604 // Printing 64 bit integers 605 static const char* jlong_format_specifier(); 606 static const char* julong_format_specifier(); 607 608 // Support for signals (see JVM_RaiseSignal, JVM_RegisterSignal) 609 static void signal_init(); 610 static void signal_init_pd(); 611 static void signal_notify(int signal_number); 612 static void* signal(int signal_number, void* handler); 613 static void signal_raise(int signal_number); 614 static int signal_wait(); 615 static int signal_lookup(); 616 static void* user_handler(); 617 static void terminate_signal_thread(); 618 static int sigexitnum_pd(); 619 620 // random number generation 621 static long random(); // return 32bit pseudorandom number 622 static void init_random(long initval); // initialize random sequence 623 624 // Structured OS Exception support 625 static void os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread); 626 627 // On Windows this will create an actual minidump, on Linux/Solaris it will simply check core dump limits 628 static void check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize); 629 630 // JVMTI & JVM monitoring and management support 631 // The thread_cpu_time() and current_thread_cpu_time() are only 632 // supported if is_thread_cpu_time_supported() returns true. 633 // They are not supported on Solaris T1. 634 635 // Thread CPU Time - return the fast estimate on a platform 636 // On Solaris - call gethrvtime (fast) - user time only 637 // On Linux - fast clock_gettime where available - user+sys 638 // - otherwise: very slow /proc fs - user+sys 639 // On Windows - GetThreadTimes - user+sys 640 static jlong current_thread_cpu_time(); 641 static jlong thread_cpu_time(Thread* t); 642 643 // Thread CPU Time with user_sys_cpu_time parameter. 644 // 645 // If user_sys_cpu_time is true, user+sys time is returned. 646 // Otherwise, only user time is returned 647 static jlong current_thread_cpu_time(bool user_sys_cpu_time); 648 static jlong thread_cpu_time(Thread* t, bool user_sys_cpu_time); 649 650 // Return a bunch of info about the timers. 651 // Note that the returned info for these two functions may be different 652 // on some platforms 653 static void current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr); 654 static void thread_cpu_time_info(jvmtiTimerInfo *info_ptr); 655 656 static bool is_thread_cpu_time_supported(); 657 658 // System loadavg support. Returns -1 if load average cannot be obtained. 659 static int loadavg(double loadavg[], int nelem); 660 661 // Hook for os specific jvm options that we don't want to abort on seeing 662 static bool obsolete_option(const JavaVMOption *option); 663 664 // Read file line by line. If line is longer than bsize, 665 // rest of line is skipped. Returns number of bytes read or -1 on EOF 666 static int get_line_chars(int fd, char *buf, const size_t bsize); 667 668 // Platform dependent stuff 669#ifdef TARGET_OS_FAMILY_linux 670# include "os_linux.hpp" 671#endif 672#ifdef TARGET_OS_FAMILY_solaris 673# include "os_solaris.hpp" 674#endif 675#ifdef TARGET_OS_FAMILY_windows 676# include "os_windows.hpp" 677#endif 678#ifdef TARGET_OS_ARCH_linux_x86 679# include "os_linux_x86.hpp" 680#endif 681#ifdef TARGET_OS_ARCH_linux_sparc 682# include "os_linux_sparc.hpp" 683#endif 684#ifdef TARGET_OS_ARCH_linux_zero 685# include "os_linux_zero.hpp" 686#endif 687#ifdef TARGET_OS_ARCH_solaris_x86 688# include "os_solaris_x86.hpp" 689#endif 690#ifdef TARGET_OS_ARCH_solaris_sparc 691# include "os_solaris_sparc.hpp" 692#endif 693#ifdef TARGET_OS_ARCH_windows_x86 694# include "os_windows_x86.hpp" 695#endif 696#ifdef TARGET_OS_ARCH_linux_arm 697# include "os_linux_arm.hpp" 698#endif 699#ifdef TARGET_OS_ARCH_linux_ppc 700# include "os_linux_ppc.hpp" 701#endif 702 703 704 // debugging support (mostly used by debug.cpp but also fatal error handler) 705 static bool find(address pc, outputStream* st = tty); // OS specific function to make sense out of an address 706 707 static bool dont_yield(); // when true, JVM_Yield() is nop 708 static void print_statistics(); 709 710 // Thread priority helpers (implemented in OS-specific part) 711 static OSReturn set_native_priority(Thread* thread, int native_prio); 712 static OSReturn get_native_priority(const Thread* const thread, int* priority_ptr); 713 static int java_to_os_priority[MaxPriority + 1]; 714 // Hint to the underlying OS that a task switch would not be good. 715 // Void return because it's a hint and can fail. 716 static void hint_no_preempt(); 717 718 // Used at creation if requested by the diagnostic flag PauseAtStartup. 719 // Causes the VM to wait until an external stimulus has been applied 720 // (for Unix, that stimulus is a signal, for Windows, an external 721 // ResumeThread call) 722 static void pause(); 723 724 protected: 725 static long _rand_seed; // seed for random number generator 726 static int _processor_count; // number of processors 727 728 static char* format_boot_path(const char* format_string, 729 const char* home, 730 int home_len, 731 char fileSep, 732 char pathSep); 733 static bool set_boot_path(char fileSep, char pathSep); 734 static char** split_path(const char* path, int* n); 735}; 736 737// Note that "PAUSE" is almost always used with synchronization 738// so arguably we should provide Atomic::SpinPause() instead 739// of the global SpinPause() with C linkage. 740// It'd also be eligible for inlining on many platforms. 741 742extern "C" int SpinPause () ; 743extern "C" int SafeFetch32 (int * adr, int errValue) ; 744extern "C" intptr_t SafeFetchN (intptr_t * adr, intptr_t errValue) ; 745 746#endif // SHARE_VM_RUNTIME_OS_HPP 747