os.hpp revision 2767:436b4a3231bf
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#ifdef TARGET_OS_FAMILY_bsd 43# include "jvm_bsd.h" 44#endif 45 46// os defines the interface to operating system; this includes traditional 47// OS services (time, I/O) as well as other functionality with system- 48// dependent code. 49 50typedef void (*dll_func)(...); 51 52class Thread; 53class JavaThread; 54class Event; 55class DLL; 56class FileHandle; 57template<class E> class GrowableArray; 58 59// %%%%% Moved ThreadState, START_FN, OSThread to new osThread.hpp. -- Rose 60 61// Platform-independent error return values from OS functions 62enum OSReturn { 63 OS_OK = 0, // Operation was successful 64 OS_ERR = -1, // Operation failed 65 OS_INTRPT = -2, // Operation was interrupted 66 OS_TIMEOUT = -3, // Operation timed out 67 OS_NOMEM = -5, // Operation failed for lack of memory 68 OS_NORESOURCE = -6 // Operation failed for lack of nonmemory resource 69}; 70 71enum ThreadPriority { // JLS 20.20.1-3 72 NoPriority = -1, // Initial non-priority value 73 MinPriority = 1, // Minimum priority 74 NormPriority = 5, // Normal (non-daemon) priority 75 NearMaxPriority = 9, // High priority, used for VMThread 76 MaxPriority = 10 // Highest priority, used for WatcherThread 77 // ensures that VMThread doesn't starve profiler 78}; 79 80// Typedef for structured exception handling support 81typedef void (*java_call_t)(JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread); 82 83class os: AllStatic { 84 public: 85 enum { page_sizes_max = 9 }; // Size of _page_sizes array (8 plus a sentinel) 86 87 private: 88 static OSThread* _starting_thread; 89 static address _polling_page; 90 static volatile int32_t * _mem_serialize_page; 91 static uintptr_t _serialize_page_mask; 92 public: 93 static size_t _page_sizes[page_sizes_max]; 94 95 private: 96 static void init_page_sizes(size_t default_page_size) { 97 _page_sizes[0] = default_page_size; 98 _page_sizes[1] = 0; // sentinel 99 } 100 101 public: 102 103 static void init(void); // Called before command line parsing 104 static jint init_2(void); // Called after command line parsing 105 static void init_3(void); // Called at the end of vm init 106 107 // File names are case-insensitive on windows only 108 // Override me as needed 109 static int file_name_strcmp(const char* s1, const char* s2); 110 111 static bool getenv(const char* name, char* buffer, int len); 112 static bool have_special_privileges(); 113 114 static jlong javaTimeMillis(); 115 static jlong javaTimeNanos(); 116 static void javaTimeNanos_info(jvmtiTimerInfo *info_ptr); 117 static void run_periodic_checks(); 118 119 120 // Returns the elapsed time in seconds since the vm started. 121 static double elapsedTime(); 122 123 // Returns real time in seconds since an arbitrary point 124 // in the past. 125 static bool getTimesSecs(double* process_real_time, 126 double* process_user_time, 127 double* process_system_time); 128 129 // Interface to the performance counter 130 static jlong elapsed_counter(); 131 static jlong elapsed_frequency(); 132 133 // The "virtual time" of a thread is the amount of time a thread has 134 // actually run. The first function indicates whether the OS supports 135 // this functionality for the current thread, and if so: 136 // * the second enables vtime tracking (if that is required). 137 // * the third tells whether vtime is enabled. 138 // * the fourth returns the elapsed virtual time for the current 139 // thread. 140 static bool supports_vtime(); 141 static bool enable_vtime(); 142 static bool vtime_enabled(); 143 static double elapsedVTime(); 144 145 // Return current local time in a string (YYYY-MM-DD HH:MM:SS). 146 // It is MT safe, but not async-safe, as reading time zone 147 // information may require a lock on some platforms. 148 static char* local_time_string(char *buf, size_t buflen); 149 static struct tm* localtime_pd (const time_t* clock, struct tm* res); 150 // Fill in buffer with current local time as an ISO-8601 string. 151 // E.g., YYYY-MM-DDThh:mm:ss.mmm+zzzz. 152 // Returns buffer, or NULL if it failed. 153 static char* iso8601_time(char* buffer, size_t buffer_length); 154 155 // Interface for detecting multiprocessor system 156 static inline bool is_MP() { 157 assert(_processor_count > 0, "invalid processor count"); 158 return _processor_count > 1; 159 } 160 static julong available_memory(); 161 static julong physical_memory(); 162 static julong allocatable_physical_memory(julong size); 163 static bool is_server_class_machine(); 164 165 // number of CPUs 166 static int processor_count() { 167 return _processor_count; 168 } 169 static void set_processor_count(int count) { _processor_count = count; } 170 171 // Returns the number of CPUs this process is currently allowed to run on. 172 // Note that on some OSes this can change dynamically. 173 static int active_processor_count(); 174 175 // Bind processes to processors. 176 // This is a two step procedure: 177 // first you generate a distribution of processes to processors, 178 // then you bind processes according to that distribution. 179 // Compute a distribution for number of processes to processors. 180 // Stores the processor id's into the distribution array argument. 181 // Returns true if it worked, false if it didn't. 182 static bool distribute_processes(uint length, uint* distribution); 183 // Binds the current process to a processor. 184 // Returns true if it worked, false if it didn't. 185 static bool bind_to_processor(uint processor_id); 186 187 // Give a name to the current thread. 188 static void set_native_thread_name(const char *name); 189 190 // Interface for stack banging (predetect possible stack overflow for 191 // exception processing) There are guard pages, and above that shadow 192 // pages for stack overflow checking. 193 static bool uses_stack_guard_pages(); 194 static bool allocate_stack_guard_pages(); 195 static void bang_stack_shadow_pages(); 196 static bool stack_shadow_pages_available(Thread *thread, methodHandle method); 197 198 // OS interface to Virtual Memory 199 200 // Return the default page size. 201 static int vm_page_size(); 202 203 // Return the page size to use for a region of memory. The min_pages argument 204 // is a hint intended to limit fragmentation; it says the returned page size 205 // should be <= region_max_size / min_pages. Because min_pages is a hint, 206 // this routine may return a size larger than region_max_size / min_pages. 207 // 208 // The current implementation ignores min_pages if a larger page size is an 209 // exact multiple of both region_min_size and region_max_size. This allows 210 // larger pages to be used when doing so would not cause fragmentation; in 211 // particular, a single page can be used when region_min_size == 212 // region_max_size == a supported page size. 213 static size_t page_size_for_region(size_t region_min_size, 214 size_t region_max_size, 215 uint min_pages); 216 217 // Methods for tracing page sizes returned by the above method; enabled by 218 // TracePageSizes. The region_{min,max}_size parameters should be the values 219 // passed to page_size_for_region() and page_size should be the result of that 220 // call. The (optional) base and size parameters should come from the 221 // ReservedSpace base() and size() methods. 222 static void trace_page_sizes(const char* str, const size_t* page_sizes, 223 int count) PRODUCT_RETURN; 224 static void trace_page_sizes(const char* str, const size_t region_min_size, 225 const size_t region_max_size, 226 const size_t page_size, 227 const char* base = NULL, 228 const size_t size = 0) PRODUCT_RETURN; 229 230 static int vm_allocation_granularity(); 231 static char* reserve_memory(size_t bytes, char* addr = 0, 232 size_t alignment_hint = 0); 233 static char* attempt_reserve_memory_at(size_t bytes, char* addr); 234 static void split_reserved_memory(char *base, size_t size, 235 size_t split, bool realloc); 236 static bool commit_memory(char* addr, size_t bytes, 237 bool executable = false); 238 static bool commit_memory(char* addr, size_t size, size_t alignment_hint, 239 bool executable = false); 240 static bool uncommit_memory(char* addr, size_t bytes); 241 static bool release_memory(char* addr, size_t bytes); 242 243 enum ProtType { MEM_PROT_NONE, MEM_PROT_READ, MEM_PROT_RW, MEM_PROT_RWX }; 244 static bool protect_memory(char* addr, size_t bytes, ProtType prot, 245 bool is_committed = true); 246 247 static bool guard_memory(char* addr, size_t bytes); 248 static bool unguard_memory(char* addr, size_t bytes); 249 static bool create_stack_guard_pages(char* addr, size_t bytes); 250 static bool remove_stack_guard_pages(char* addr, size_t bytes); 251 252 static char* map_memory(int fd, const char* file_name, size_t file_offset, 253 char *addr, size_t bytes, bool read_only = false, 254 bool allow_exec = false); 255 static char* remap_memory(int fd, const char* file_name, size_t file_offset, 256 char *addr, size_t bytes, bool read_only, 257 bool allow_exec); 258 static bool unmap_memory(char *addr, size_t bytes); 259 static void free_memory(char *addr, size_t bytes); 260 static void realign_memory(char *addr, size_t bytes, size_t alignment_hint); 261 262 // NUMA-specific interface 263 static bool numa_has_static_binding(); 264 static bool numa_has_group_homing(); 265 static void numa_make_local(char *addr, size_t bytes, int lgrp_hint); 266 static void numa_make_global(char *addr, size_t bytes); 267 static size_t numa_get_groups_num(); 268 static size_t numa_get_leaf_groups(int *ids, size_t size); 269 static bool numa_topology_changed(); 270 static int numa_get_group_id(); 271 272 // Page manipulation 273 struct page_info { 274 size_t size; 275 int lgrp_id; 276 }; 277 static bool get_page_info(char *start, page_info* info); 278 static char* scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found); 279 280 static char* non_memory_address_word(); 281 // reserve, commit and pin the entire memory region 282 static char* reserve_memory_special(size_t size, char* addr = NULL, 283 bool executable = false); 284 static bool release_memory_special(char* addr, size_t bytes); 285 static void large_page_init(); 286 static size_t large_page_size(); 287 static bool can_commit_large_page_memory(); 288 static bool can_execute_large_page_memory(); 289 290 // OS interface to polling page 291 static address get_polling_page() { return _polling_page; } 292 static void set_polling_page(address page) { _polling_page = page; } 293 static bool is_poll_address(address addr) { return addr >= _polling_page && addr < (_polling_page + os::vm_page_size()); } 294 static void make_polling_page_unreadable(); 295 static void make_polling_page_readable(); 296 297 // Routines used to serialize the thread state without using membars 298 static void serialize_thread_states(); 299 300 // Since we write to the serialize page from every thread, we 301 // want stores to be on unique cache lines whenever possible 302 // in order to minimize CPU cross talk. We pre-compute the 303 // amount to shift the thread* to make this offset unique to 304 // each thread. 305 static int get_serialize_page_shift_count() { 306 return SerializePageShiftCount; 307 } 308 309 static void set_serialize_page_mask(uintptr_t mask) { 310 _serialize_page_mask = mask; 311 } 312 313 static unsigned int get_serialize_page_mask() { 314 return _serialize_page_mask; 315 } 316 317 static void set_memory_serialize_page(address page); 318 319 static address get_memory_serialize_page() { 320 return (address)_mem_serialize_page; 321 } 322 323 static inline void write_memory_serialize_page(JavaThread *thread) { 324 uintptr_t page_offset = ((uintptr_t)thread >> 325 get_serialize_page_shift_count()) & 326 get_serialize_page_mask(); 327 *(volatile int32_t *)((uintptr_t)_mem_serialize_page+page_offset) = 1; 328 } 329 330 static bool is_memory_serialize_page(JavaThread *thread, address addr) { 331 if (UseMembar) return false; 332 // Previously this function calculated the exact address of this 333 // thread's serialize page, and checked if the faulting address 334 // was equal. However, some platforms mask off faulting addresses 335 // to the page size, so now we just check that the address is 336 // within the page. This makes the thread argument unnecessary, 337 // but we retain the NULL check to preserve existing behaviour. 338 if (thread == NULL) return false; 339 address page = (address) _mem_serialize_page; 340 return addr >= page && addr < (page + os::vm_page_size()); 341 } 342 343 static void block_on_serialize_page_trap(); 344 345 // threads 346 347 enum ThreadType { 348 vm_thread, 349 cgc_thread, // Concurrent GC thread 350 pgc_thread, // Parallel GC thread 351 java_thread, 352 compiler_thread, 353 watcher_thread, 354 os_thread 355 }; 356 357 static bool create_thread(Thread* thread, 358 ThreadType thr_type, 359 size_t stack_size = 0); 360 static bool create_main_thread(JavaThread* thread); 361 static bool create_attached_thread(JavaThread* thread); 362 static void pd_start_thread(Thread* thread); 363 static void start_thread(Thread* thread); 364 365 static void initialize_thread(); 366 static void free_thread(OSThread* osthread); 367 368 // thread id on Linux/64bit is 64bit, on Windows and Solaris, it's 32bit 369 static intx current_thread_id(); 370 static int current_process_id(); 371 static int sleep(Thread* thread, jlong ms, bool interruptable); 372 static int naked_sleep(); 373 static void infinite_sleep(); // never returns, use with CAUTION 374 static void yield(); // Yields to all threads with same priority 375 enum YieldResult { 376 YIELD_SWITCHED = 1, // caller descheduled, other ready threads exist & ran 377 YIELD_NONEREADY = 0, // No other runnable/ready threads. 378 // platform-specific yield return immediately 379 YIELD_UNKNOWN = -1 // Unknown: platform doesn't support _SWITCHED or _NONEREADY 380 // YIELD_SWITCHED and YIELD_NONREADY imply the platform supports a "strong" 381 // yield that can be used in lieu of blocking. 382 } ; 383 static YieldResult NakedYield () ; 384 static void yield_all(int attempts = 0); // Yields to all other threads including lower priority 385 static void loop_breaker(int attempts); // called from within tight loops to possibly influence time-sharing 386 static OSReturn set_priority(Thread* thread, ThreadPriority priority); 387 static OSReturn get_priority(const Thread* const thread, ThreadPriority& priority); 388 389 static void interrupt(Thread* thread); 390 static bool is_interrupted(Thread* thread, bool clear_interrupted); 391 392 static int pd_self_suspend_thread(Thread* thread); 393 394 static ExtendedPC fetch_frame_from_context(void* ucVoid, intptr_t** sp, intptr_t** fp); 395 static frame fetch_frame_from_context(void* ucVoid); 396 397 static ExtendedPC get_thread_pc(Thread *thread); 398 static void breakpoint(); 399 400 static address current_stack_pointer(); 401 static address current_stack_base(); 402 static size_t current_stack_size(); 403 404 static int message_box(const char* title, const char* message); 405 static char* do_you_want_to_debug(const char* message); 406 407 // run cmd in a separate process and return its exit code; or -1 on failures 408 static int fork_and_exec(char *cmd); 409 410 // Set file to send error reports. 411 static void set_error_file(const char *logfile); 412 413 // os::exit() is merged with vm_exit() 414 // static void exit(int num); 415 416 // Terminate the VM, but don't exit the process 417 static void shutdown(); 418 419 // Terminate with an error. Default is to generate a core file on platforms 420 // that support such things. This calls shutdown() and then aborts. 421 static void abort(bool dump_core = true); 422 423 // Die immediately, no exit hook, no abort hook, no cleanup. 424 static void die(); 425 426 // File i/o operations 427 static const int default_file_open_flags(); 428 static int open(const char *path, int oflag, int mode); 429 static int close(int fd); 430 static jlong lseek(int fd, jlong offset, int whence); 431 static char* native_path(char *path); 432 static int ftruncate(int fd, jlong length); 433 static int fsync(int fd); 434 static int available(int fd, jlong *bytes); 435 436 //File i/o operations 437 438 static size_t read(int fd, void *buf, unsigned int nBytes); 439 static size_t restartable_read(int fd, void *buf, unsigned int nBytes); 440 static size_t write(int fd, const void *buf, unsigned int nBytes); 441 442 // Reading directories. 443 static DIR* opendir(const char* dirname); 444 static int readdir_buf_size(const char *path); 445 static struct dirent* readdir(DIR* dirp, dirent* dbuf); 446 static int closedir(DIR* dirp); 447 448 // Dynamic library extension 449 static const char* dll_file_extension(); 450 451 static const char* get_temp_directory(); 452 static const char* get_current_directory(char *buf, int buflen); 453 454 // Builds a platform-specific full library path given a ld path and lib name 455 static void dll_build_name(char* buffer, size_t size, 456 const char* pathname, const char* fname); 457 458 // Symbol lookup, find nearest function name; basically it implements 459 // dladdr() for all platforms. Name of the nearest function is copied 460 // to buf. Distance from its base address is returned as offset. 461 // If function name is not found, buf[0] is set to '\0' and offset is 462 // set to -1. 463 static bool dll_address_to_function_name(address addr, char* buf, 464 int buflen, int* offset); 465 466 // Locate DLL/DSO. On success, full path of the library is copied to 467 // buf, and offset is set to be the distance between addr and the 468 // library's base address. On failure, buf[0] is set to '\0' and 469 // offset is set to -1. 470 static bool dll_address_to_library_name(address addr, char* buf, 471 int buflen, int* offset); 472 473 // Find out whether the pc is in the static code for jvm.dll/libjvm.so. 474 static bool address_is_in_vm(address addr); 475 476 // Loads .dll/.so and 477 // in case of error it checks if .dll/.so was built for the 478 // same architecture as Hotspot is running on 479 static void* dll_load(const char *name, char *ebuf, int ebuflen); 480 481 // lookup symbol in a shared library 482 static void* dll_lookup(void* handle, const char* name); 483 484 // Unload library 485 static void dll_unload(void *lib); 486 487 // Print out system information; they are called by fatal error handler. 488 // Output format may be different on different platforms. 489 static void print_os_info(outputStream* st); 490 static void print_cpu_info(outputStream* st); 491 static void pd_print_cpu_info(outputStream* st); 492 static void print_memory_info(outputStream* st); 493 static void print_dll_info(outputStream* st); 494 static void print_environment_variables(outputStream* st, const char** env_list, char* buffer, int len); 495 static void print_context(outputStream* st, void* context); 496 static void print_register_info(outputStream* st, void* context); 497 static void print_siginfo(outputStream* st, void* siginfo); 498 static void print_signal_handlers(outputStream* st, char* buf, size_t buflen); 499 static void print_date_and_time(outputStream* st); 500 501 static void print_location(outputStream* st, intptr_t x, bool verbose = false); 502 static size_t lasterror(char *buf, size_t len); 503 504 // Determines whether the calling process is being debugged by a user-mode debugger. 505 static bool is_debugger_attached(); 506 507 // wait for a key press if PauseAtExit is set 508 static void wait_for_keypress_at_exit(void); 509 510 // The following two functions are used by fatal error handler to trace 511 // native (C) frames. They are not part of frame.hpp/frame.cpp because 512 // frame.hpp/cpp assume thread is JavaThread, and also because different 513 // OS/compiler may have different convention or provide different API to 514 // walk C frames. 515 // 516 // We don't attempt to become a debugger, so we only follow frames if that 517 // does not require a lookup in the unwind table, which is part of the binary 518 // file but may be unsafe to read after a fatal error. So on x86, we can 519 // only walk stack if %ebp is used as frame pointer; on ia64, it's not 520 // possible to walk C stack without having the unwind table. 521 static bool is_first_C_frame(frame *fr); 522 static frame get_sender_for_C_frame(frame *fr); 523 524 // return current frame. pc() and sp() are set to NULL on failure. 525 static frame current_frame(); 526 527 static void print_hex_dump(outputStream* st, address start, address end, int unitsize); 528 529 // returns a string to describe the exception/signal; 530 // returns NULL if exception_code is not an OS exception/signal. 531 static const char* exception_name(int exception_code, char* buf, size_t buflen); 532 533 // Returns native Java library, loads if necessary 534 static void* native_java_library(); 535 536 // Fills in path to jvm.dll/libjvm.so (used by the Disassembler) 537 static void jvm_path(char *buf, jint buflen); 538 539 // Returns true if we are running in a headless jre. 540 static bool is_headless_jre(); 541 542 // JNI names 543 static void print_jni_name_prefix_on(outputStream* st, int args_size); 544 static void print_jni_name_suffix_on(outputStream* st, int args_size); 545 546 // File conventions 547 static const char* file_separator(); 548 static const char* line_separator(); 549 static const char* path_separator(); 550 551 // Init os specific system properties values 552 static void init_system_properties_values(); 553 554 // IO operations, non-JVM_ version. 555 static int stat(const char* path, struct stat* sbuf); 556 static bool dir_is_empty(const char* path); 557 558 // IO operations on binary files 559 static int create_binary_file(const char* path, bool rewrite_existing); 560 static jlong current_file_offset(int fd); 561 static jlong seek_to_file_offset(int fd, jlong offset); 562 563 // Thread Local Storage 564 static int allocate_thread_local_storage(); 565 static void thread_local_storage_at_put(int index, void* value); 566 static void* thread_local_storage_at(int index); 567 static void free_thread_local_storage(int index); 568 569 // General allocation (must be MT-safe) 570 static void* malloc (size_t size); 571 static void* realloc (void *memblock, size_t size); 572 static void free (void *memblock); 573 static bool check_heap(bool force = false); // verify C heap integrity 574 static char* strdup(const char *); // Like strdup 575 576#ifndef PRODUCT 577 static julong num_mallocs; // # of calls to malloc/realloc 578 static julong alloc_bytes; // # of bytes allocated 579 static julong num_frees; // # of calls to free 580 static julong free_bytes; // # of bytes freed 581#endif 582 583 // SocketInterface (ex HPI SocketInterface ) 584 static int socket(int domain, int type, int protocol); 585 static int socket_close(int fd); 586 static int socket_shutdown(int fd, int howto); 587 static int recv(int fd, char *buf, int nBytes, int flags); 588 static int send(int fd, char *buf, int nBytes, int flags); 589 static int raw_send(int fd, char *buf, int nBytes, int flags); 590 static int timeout(int fd, long timeout); 591 static int listen(int fd, int count); 592 static int connect(int fd, struct sockaddr *him, int len); 593 static int bind(int fd, struct sockaddr *him, int len); 594 static int accept(int fd, struct sockaddr *him, int *len); 595 static int recvfrom(int fd, char *buf, int nbytes, int flags, 596 struct sockaddr *from, int *fromlen); 597 static int get_sock_name(int fd, struct sockaddr *him, int *len); 598 static int sendto(int fd, char *buf, int len, int flags, 599 struct sockaddr *to, int tolen); 600 static int socket_available(int fd, jint *pbytes); 601 602 static int get_sock_opt(int fd, int level, int optname, 603 char *optval, int* optlen); 604 static int set_sock_opt(int fd, int level, int optname, 605 const char *optval, int optlen); 606 static int get_host_name(char* name, int namelen); 607 608 static struct hostent* get_host_by_name(char* name); 609 610 // Printing 64 bit integers 611 static const char* jlong_format_specifier(); 612 static const char* julong_format_specifier(); 613 614 // Support for signals (see JVM_RaiseSignal, JVM_RegisterSignal) 615 static void signal_init(); 616 static void signal_init_pd(); 617 static void signal_notify(int signal_number); 618 static void* signal(int signal_number, void* handler); 619 static void signal_raise(int signal_number); 620 static int signal_wait(); 621 static int signal_lookup(); 622 static void* user_handler(); 623 static void terminate_signal_thread(); 624 static int sigexitnum_pd(); 625 626 // random number generation 627 static long random(); // return 32bit pseudorandom number 628 static void init_random(long initval); // initialize random sequence 629 630 // Structured OS Exception support 631 static void os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread); 632 633 // On Windows this will create an actual minidump, on Linux/Solaris it will simply check core dump limits 634 static void check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize); 635 636 // JVMTI & JVM monitoring and management support 637 // The thread_cpu_time() and current_thread_cpu_time() are only 638 // supported if is_thread_cpu_time_supported() returns true. 639 // They are not supported on Solaris T1. 640 641 // Thread CPU Time - return the fast estimate on a platform 642 // On Solaris - call gethrvtime (fast) - user time only 643 // On Linux - fast clock_gettime where available - user+sys 644 // - otherwise: very slow /proc fs - user+sys 645 // On Windows - GetThreadTimes - user+sys 646 static jlong current_thread_cpu_time(); 647 static jlong thread_cpu_time(Thread* t); 648 649 // Thread CPU Time with user_sys_cpu_time parameter. 650 // 651 // If user_sys_cpu_time is true, user+sys time is returned. 652 // Otherwise, only user time is returned 653 static jlong current_thread_cpu_time(bool user_sys_cpu_time); 654 static jlong thread_cpu_time(Thread* t, bool user_sys_cpu_time); 655 656 // Return a bunch of info about the timers. 657 // Note that the returned info for these two functions may be different 658 // on some platforms 659 static void current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr); 660 static void thread_cpu_time_info(jvmtiTimerInfo *info_ptr); 661 662 static bool is_thread_cpu_time_supported(); 663 664 // System loadavg support. Returns -1 if load average cannot be obtained. 665 static int loadavg(double loadavg[], int nelem); 666 667 // Hook for os specific jvm options that we don't want to abort on seeing 668 static bool obsolete_option(const JavaVMOption *option); 669 670 // Read file line by line. If line is longer than bsize, 671 // rest of line is skipped. Returns number of bytes read or -1 on EOF 672 static int get_line_chars(int fd, char *buf, const size_t bsize); 673 674 // Platform dependent stuff 675#ifdef TARGET_OS_FAMILY_linux 676# include "os_linux.hpp" 677#endif 678#ifdef TARGET_OS_FAMILY_solaris 679# include "os_solaris.hpp" 680#endif 681#ifdef TARGET_OS_FAMILY_windows 682# include "os_windows.hpp" 683#endif 684#ifdef TARGET_OS_FAMILY_bsd 685# include "os_bsd.hpp" 686#endif 687#ifdef TARGET_OS_ARCH_linux_x86 688# include "os_linux_x86.hpp" 689#endif 690#ifdef TARGET_OS_ARCH_linux_sparc 691# include "os_linux_sparc.hpp" 692#endif 693#ifdef TARGET_OS_ARCH_linux_zero 694# include "os_linux_zero.hpp" 695#endif 696#ifdef TARGET_OS_ARCH_solaris_x86 697# include "os_solaris_x86.hpp" 698#endif 699#ifdef TARGET_OS_ARCH_solaris_sparc 700# include "os_solaris_sparc.hpp" 701#endif 702#ifdef TARGET_OS_ARCH_windows_x86 703# include "os_windows_x86.hpp" 704#endif 705#ifdef TARGET_OS_ARCH_linux_arm 706# include "os_linux_arm.hpp" 707#endif 708#ifdef TARGET_OS_ARCH_linux_ppc 709# include "os_linux_ppc.hpp" 710#endif 711#ifdef TARGET_OS_ARCH_bsd_x86 712# include "os_bsd_x86.hpp" 713#endif 714#ifdef TARGET_OS_ARCH_bsd_zero 715# include "os_bsd_zero.hpp" 716#endif 717 718 719 // debugging support (mostly used by debug.cpp but also fatal error handler) 720 static bool find(address pc, outputStream* st = tty); // OS specific function to make sense out of an address 721 722 static bool dont_yield(); // when true, JVM_Yield() is nop 723 static void print_statistics(); 724 725 // Thread priority helpers (implemented in OS-specific part) 726 static OSReturn set_native_priority(Thread* thread, int native_prio); 727 static OSReturn get_native_priority(const Thread* const thread, int* priority_ptr); 728 static int java_to_os_priority[MaxPriority + 1]; 729 // Hint to the underlying OS that a task switch would not be good. 730 // Void return because it's a hint and can fail. 731 static void hint_no_preempt(); 732 733 // Used at creation if requested by the diagnostic flag PauseAtStartup. 734 // Causes the VM to wait until an external stimulus has been applied 735 // (for Unix, that stimulus is a signal, for Windows, an external 736 // ResumeThread call) 737 static void pause(); 738 739 protected: 740 static long _rand_seed; // seed for random number generator 741 static int _processor_count; // number of processors 742 743 static char* format_boot_path(const char* format_string, 744 const char* home, 745 int home_len, 746 char fileSep, 747 char pathSep); 748 static bool set_boot_path(char fileSep, char pathSep); 749 static char** split_path(const char* path, int* n); 750}; 751 752// Note that "PAUSE" is almost always used with synchronization 753// so arguably we should provide Atomic::SpinPause() instead 754// of the global SpinPause() with C linkage. 755// It'd also be eligible for inlining on many platforms. 756 757extern "C" int SpinPause () ; 758extern "C" int SafeFetch32 (int * adr, int errValue) ; 759extern "C" intptr_t SafeFetchN (intptr_t * adr, intptr_t errValue) ; 760 761#endif // SHARE_VM_RUNTIME_OS_HPP 762