os.hpp revision 2944:b16494a69d3d
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 static void init(void); // Called before command line parsing 103 static jint init_2(void); // Called after command line parsing 104 static void init_globals(void) { // Called from init_globals() in init.cpp 105 init_globals_ext(); 106 } 107 static void init_3(void); // Called at the end of vm init 108 109 // File names are case-insensitive on windows only 110 // Override me as needed 111 static int file_name_strcmp(const char* s1, const char* s2); 112 113 static bool getenv(const char* name, char* buffer, int len); 114 static bool have_special_privileges(); 115 116 static jlong javaTimeMillis(); 117 static jlong javaTimeNanos(); 118 static void javaTimeNanos_info(jvmtiTimerInfo *info_ptr); 119 static void run_periodic_checks(); 120 121 122 // Returns the elapsed time in seconds since the vm started. 123 static double elapsedTime(); 124 125 // Returns real time in seconds since an arbitrary point 126 // in the past. 127 static bool getTimesSecs(double* process_real_time, 128 double* process_user_time, 129 double* process_system_time); 130 131 // Interface to the performance counter 132 static jlong elapsed_counter(); 133 static jlong elapsed_frequency(); 134 135 // The "virtual time" of a thread is the amount of time a thread has 136 // actually run. The first function indicates whether the OS supports 137 // this functionality for the current thread, and if so: 138 // * the second enables vtime tracking (if that is required). 139 // * the third tells whether vtime is enabled. 140 // * the fourth returns the elapsed virtual time for the current 141 // thread. 142 static bool supports_vtime(); 143 static bool enable_vtime(); 144 static bool vtime_enabled(); 145 static double elapsedVTime(); 146 147 // Return current local time in a string (YYYY-MM-DD HH:MM:SS). 148 // It is MT safe, but not async-safe, as reading time zone 149 // information may require a lock on some platforms. 150 static char* local_time_string(char *buf, size_t buflen); 151 static struct tm* localtime_pd (const time_t* clock, struct tm* res); 152 // Fill in buffer with current local time as an ISO-8601 string. 153 // E.g., YYYY-MM-DDThh:mm:ss.mmm+zzzz. 154 // Returns buffer, or NULL if it failed. 155 static char* iso8601_time(char* buffer, size_t buffer_length); 156 157 // Interface for detecting multiprocessor system 158 static inline bool is_MP() { 159 assert(_processor_count > 0, "invalid processor count"); 160 return _processor_count > 1; 161 } 162 static julong available_memory(); 163 static julong physical_memory(); 164 static julong allocatable_physical_memory(julong size); 165 static bool is_server_class_machine(); 166 167 // number of CPUs 168 static int processor_count() { 169 return _processor_count; 170 } 171 static void set_processor_count(int count) { _processor_count = count; } 172 173 // Returns the number of CPUs this process is currently allowed to run on. 174 // Note that on some OSes this can change dynamically. 175 static int active_processor_count(); 176 177 // Bind processes to processors. 178 // This is a two step procedure: 179 // first you generate a distribution of processes to processors, 180 // then you bind processes according to that distribution. 181 // Compute a distribution for number of processes to processors. 182 // Stores the processor id's into the distribution array argument. 183 // Returns true if it worked, false if it didn't. 184 static bool distribute_processes(uint length, uint* distribution); 185 // Binds the current process to a processor. 186 // Returns true if it worked, false if it didn't. 187 static bool bind_to_processor(uint processor_id); 188 189 // Give a name to the current thread. 190 static void set_native_thread_name(const char *name); 191 192 // Interface for stack banging (predetect possible stack overflow for 193 // exception processing) There are guard pages, and above that shadow 194 // pages for stack overflow checking. 195 static bool uses_stack_guard_pages(); 196 static bool allocate_stack_guard_pages(); 197 static void bang_stack_shadow_pages(); 198 static bool stack_shadow_pages_available(Thread *thread, methodHandle method); 199 200 // OS interface to Virtual Memory 201 202 // Return the default page size. 203 static int vm_page_size(); 204 205 // Return the page size to use for a region of memory. The min_pages argument 206 // is a hint intended to limit fragmentation; it says the returned page size 207 // should be <= region_max_size / min_pages. Because min_pages is a hint, 208 // this routine may return a size larger than region_max_size / min_pages. 209 // 210 // The current implementation ignores min_pages if a larger page size is an 211 // exact multiple of both region_min_size and region_max_size. This allows 212 // larger pages to be used when doing so would not cause fragmentation; in 213 // particular, a single page can be used when region_min_size == 214 // region_max_size == a supported page size. 215 static size_t page_size_for_region(size_t region_min_size, 216 size_t region_max_size, 217 uint min_pages); 218 219 // Methods for tracing page sizes returned by the above method; enabled by 220 // TracePageSizes. The region_{min,max}_size parameters should be the values 221 // passed to page_size_for_region() and page_size should be the result of that 222 // call. The (optional) base and size parameters should come from the 223 // ReservedSpace base() and size() methods. 224 static void trace_page_sizes(const char* str, const size_t* page_sizes, 225 int count) PRODUCT_RETURN; 226 static void trace_page_sizes(const char* str, const size_t region_min_size, 227 const size_t region_max_size, 228 const size_t page_size, 229 const char* base = NULL, 230 const size_t size = 0) PRODUCT_RETURN; 231 232 static int vm_allocation_granularity(); 233 static char* reserve_memory(size_t bytes, char* addr = 0, 234 size_t alignment_hint = 0); 235 static char* attempt_reserve_memory_at(size_t bytes, char* addr); 236 static void split_reserved_memory(char *base, size_t size, 237 size_t split, bool realloc); 238 static bool commit_memory(char* addr, size_t bytes, 239 bool executable = false); 240 static bool commit_memory(char* addr, size_t size, size_t alignment_hint, 241 bool executable = false); 242 static bool uncommit_memory(char* addr, size_t bytes); 243 static bool release_memory(char* addr, size_t bytes); 244 245 enum ProtType { MEM_PROT_NONE, MEM_PROT_READ, MEM_PROT_RW, MEM_PROT_RWX }; 246 static bool protect_memory(char* addr, size_t bytes, ProtType prot, 247 bool is_committed = true); 248 249 static bool guard_memory(char* addr, size_t bytes); 250 static bool unguard_memory(char* addr, size_t bytes); 251 static bool create_stack_guard_pages(char* addr, size_t bytes); 252 static bool remove_stack_guard_pages(char* addr, size_t bytes); 253 254 static char* map_memory(int fd, const char* file_name, size_t file_offset, 255 char *addr, size_t bytes, bool read_only = false, 256 bool allow_exec = false); 257 static char* remap_memory(int fd, const char* file_name, size_t file_offset, 258 char *addr, size_t bytes, bool read_only, 259 bool allow_exec); 260 static bool unmap_memory(char *addr, size_t bytes); 261 static void free_memory(char *addr, size_t bytes); 262 static void realign_memory(char *addr, size_t bytes, size_t alignment_hint); 263 264 // NUMA-specific interface 265 static bool numa_has_static_binding(); 266 static bool numa_has_group_homing(); 267 static void numa_make_local(char *addr, size_t bytes, int lgrp_hint); 268 static void numa_make_global(char *addr, size_t bytes); 269 static size_t numa_get_groups_num(); 270 static size_t numa_get_leaf_groups(int *ids, size_t size); 271 static bool numa_topology_changed(); 272 static int numa_get_group_id(); 273 274 // Page manipulation 275 struct page_info { 276 size_t size; 277 int lgrp_id; 278 }; 279 static bool get_page_info(char *start, page_info* info); 280 static char* scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found); 281 282 static char* non_memory_address_word(); 283 // reserve, commit and pin the entire memory region 284 static char* reserve_memory_special(size_t size, char* addr = NULL, 285 bool executable = false); 286 static bool release_memory_special(char* addr, size_t bytes); 287 static void large_page_init(); 288 static size_t large_page_size(); 289 static bool can_commit_large_page_memory(); 290 static bool can_execute_large_page_memory(); 291 292 // OS interface to polling page 293 static address get_polling_page() { return _polling_page; } 294 static void set_polling_page(address page) { _polling_page = page; } 295 static bool is_poll_address(address addr) { return addr >= _polling_page && addr < (_polling_page + os::vm_page_size()); } 296 static void make_polling_page_unreadable(); 297 static void make_polling_page_readable(); 298 299 // Routines used to serialize the thread state without using membars 300 static void serialize_thread_states(); 301 302 // Since we write to the serialize page from every thread, we 303 // want stores to be on unique cache lines whenever possible 304 // in order to minimize CPU cross talk. We pre-compute the 305 // amount to shift the thread* to make this offset unique to 306 // each thread. 307 static int get_serialize_page_shift_count() { 308 return SerializePageShiftCount; 309 } 310 311 static void set_serialize_page_mask(uintptr_t mask) { 312 _serialize_page_mask = mask; 313 } 314 315 static unsigned int get_serialize_page_mask() { 316 return _serialize_page_mask; 317 } 318 319 static void set_memory_serialize_page(address page); 320 321 static address get_memory_serialize_page() { 322 return (address)_mem_serialize_page; 323 } 324 325 static inline void write_memory_serialize_page(JavaThread *thread) { 326 uintptr_t page_offset = ((uintptr_t)thread >> 327 get_serialize_page_shift_count()) & 328 get_serialize_page_mask(); 329 *(volatile int32_t *)((uintptr_t)_mem_serialize_page+page_offset) = 1; 330 } 331 332 static bool is_memory_serialize_page(JavaThread *thread, address addr) { 333 if (UseMembar) return false; 334 // Previously this function calculated the exact address of this 335 // thread's serialize page, and checked if the faulting address 336 // was equal. However, some platforms mask off faulting addresses 337 // to the page size, so now we just check that the address is 338 // within the page. This makes the thread argument unnecessary, 339 // but we retain the NULL check to preserve existing behaviour. 340 if (thread == NULL) return false; 341 address page = (address) _mem_serialize_page; 342 return addr >= page && addr < (page + os::vm_page_size()); 343 } 344 345 static void block_on_serialize_page_trap(); 346 347 // threads 348 349 enum ThreadType { 350 vm_thread, 351 cgc_thread, // Concurrent GC thread 352 pgc_thread, // Parallel GC thread 353 java_thread, 354 compiler_thread, 355 watcher_thread, 356 os_thread 357 }; 358 359 static bool create_thread(Thread* thread, 360 ThreadType thr_type, 361 size_t stack_size = 0); 362 static bool create_main_thread(JavaThread* thread); 363 static bool create_attached_thread(JavaThread* thread); 364 static void pd_start_thread(Thread* thread); 365 static void start_thread(Thread* thread); 366 367 static void initialize_thread(); 368 static void free_thread(OSThread* osthread); 369 370 // thread id on Linux/64bit is 64bit, on Windows and Solaris, it's 32bit 371 static intx current_thread_id(); 372 static int current_process_id(); 373 static int sleep(Thread* thread, jlong ms, bool interruptable); 374 static int naked_sleep(); 375 static void infinite_sleep(); // never returns, use with CAUTION 376 static void yield(); // Yields to all threads with same priority 377 enum YieldResult { 378 YIELD_SWITCHED = 1, // caller descheduled, other ready threads exist & ran 379 YIELD_NONEREADY = 0, // No other runnable/ready threads. 380 // platform-specific yield return immediately 381 YIELD_UNKNOWN = -1 // Unknown: platform doesn't support _SWITCHED or _NONEREADY 382 // YIELD_SWITCHED and YIELD_NONREADY imply the platform supports a "strong" 383 // yield that can be used in lieu of blocking. 384 } ; 385 static YieldResult NakedYield () ; 386 static void yield_all(int attempts = 0); // Yields to all other threads including lower priority 387 static void loop_breaker(int attempts); // called from within tight loops to possibly influence time-sharing 388 static OSReturn set_priority(Thread* thread, ThreadPriority priority); 389 static OSReturn get_priority(const Thread* const thread, ThreadPriority& priority); 390 391 static void interrupt(Thread* thread); 392 static bool is_interrupted(Thread* thread, bool clear_interrupted); 393 394 static int pd_self_suspend_thread(Thread* thread); 395 396 static ExtendedPC fetch_frame_from_context(void* ucVoid, intptr_t** sp, intptr_t** fp); 397 static frame fetch_frame_from_context(void* ucVoid); 398 399 static ExtendedPC get_thread_pc(Thread *thread); 400 static void breakpoint(); 401 402 static address current_stack_pointer(); 403 static address current_stack_base(); 404 static size_t current_stack_size(); 405 406 static int message_box(const char* title, const char* message); 407 static char* do_you_want_to_debug(const char* message); 408 409 // run cmd in a separate process and return its exit code; or -1 on failures 410 static int fork_and_exec(char *cmd); 411 412 // Set file to send error reports. 413 static void set_error_file(const char *logfile); 414 415 // os::exit() is merged with vm_exit() 416 // static void exit(int num); 417 418 // Terminate the VM, but don't exit the process 419 static void shutdown(); 420 421 // Terminate with an error. Default is to generate a core file on platforms 422 // that support such things. This calls shutdown() and then aborts. 423 static void abort(bool dump_core = true); 424 425 // Die immediately, no exit hook, no abort hook, no cleanup. 426 static void die(); 427 428 // File i/o operations 429 static const int default_file_open_flags(); 430 static int open(const char *path, int oflag, int mode); 431 static int close(int fd); 432 static jlong lseek(int fd, jlong offset, int whence); 433 static char* native_path(char *path); 434 static int ftruncate(int fd, jlong length); 435 static int fsync(int fd); 436 static int available(int fd, jlong *bytes); 437 438 //File i/o operations 439 440 static size_t read(int fd, void *buf, unsigned int nBytes); 441 static size_t restartable_read(int fd, void *buf, unsigned int nBytes); 442 static size_t write(int fd, const void *buf, unsigned int nBytes); 443 444 // Reading directories. 445 static DIR* opendir(const char* dirname); 446 static int readdir_buf_size(const char *path); 447 static struct dirent* readdir(DIR* dirp, dirent* dbuf); 448 static int closedir(DIR* dirp); 449 450 // Dynamic library extension 451 static const char* dll_file_extension(); 452 453 static const char* get_temp_directory(); 454 static const char* get_current_directory(char *buf, int buflen); 455 456 // Builds a platform-specific full library path given a ld path and lib name 457 static void dll_build_name(char* buffer, size_t size, 458 const char* pathname, const char* fname); 459 460 // Symbol lookup, find nearest function name; basically it implements 461 // dladdr() for all platforms. Name of the nearest function is copied 462 // to buf. Distance from its base address is returned as offset. 463 // If function name is not found, buf[0] is set to '\0' and offset is 464 // set to -1. 465 static bool dll_address_to_function_name(address addr, char* buf, 466 int buflen, int* offset); 467 468 // Locate DLL/DSO. On success, full path of the library is copied to 469 // buf, and offset is set to be the distance between addr and the 470 // library's base address. On failure, buf[0] is set to '\0' and 471 // offset is set to -1. 472 static bool dll_address_to_library_name(address addr, char* buf, 473 int buflen, int* offset); 474 475 // Find out whether the pc is in the static code for jvm.dll/libjvm.so. 476 static bool address_is_in_vm(address addr); 477 478 // Loads .dll/.so and 479 // in case of error it checks if .dll/.so was built for the 480 // same architecture as Hotspot is running on 481 static void* dll_load(const char *name, char *ebuf, int ebuflen); 482 483 // lookup symbol in a shared library 484 static void* dll_lookup(void* handle, const char* name); 485 486 // Unload library 487 static void dll_unload(void *lib); 488 489 // Print out system information; they are called by fatal error handler. 490 // Output format may be different on different platforms. 491 static void print_os_info(outputStream* st); 492 static void print_cpu_info(outputStream* st); 493 static void pd_print_cpu_info(outputStream* st); 494 static void print_memory_info(outputStream* st); 495 static void print_dll_info(outputStream* st); 496 static void print_environment_variables(outputStream* st, const char** env_list, char* buffer, int len); 497 static void print_context(outputStream* st, void* context); 498 static void print_register_info(outputStream* st, void* context); 499 static void print_siginfo(outputStream* st, void* siginfo); 500 static void print_signal_handlers(outputStream* st, char* buf, size_t buflen); 501 static void print_date_and_time(outputStream* st); 502 503 static void print_location(outputStream* st, intptr_t x, bool verbose = false); 504 static size_t lasterror(char *buf, size_t len); 505 static int get_last_error(); 506 507 // Determines whether the calling process is being debugged by a user-mode debugger. 508 static bool is_debugger_attached(); 509 510 // wait for a key press if PauseAtExit is set 511 static void wait_for_keypress_at_exit(void); 512 513 // The following two functions are used by fatal error handler to trace 514 // native (C) frames. They are not part of frame.hpp/frame.cpp because 515 // frame.hpp/cpp assume thread is JavaThread, and also because different 516 // OS/compiler may have different convention or provide different API to 517 // walk C frames. 518 // 519 // We don't attempt to become a debugger, so we only follow frames if that 520 // does not require a lookup in the unwind table, which is part of the binary 521 // file but may be unsafe to read after a fatal error. So on x86, we can 522 // only walk stack if %ebp is used as frame pointer; on ia64, it's not 523 // possible to walk C stack without having the unwind table. 524 static bool is_first_C_frame(frame *fr); 525 static frame get_sender_for_C_frame(frame *fr); 526 527 // return current frame. pc() and sp() are set to NULL on failure. 528 static frame current_frame(); 529 530 static void print_hex_dump(outputStream* st, address start, address end, int unitsize); 531 532 // returns a string to describe the exception/signal; 533 // returns NULL if exception_code is not an OS exception/signal. 534 static const char* exception_name(int exception_code, char* buf, size_t buflen); 535 536 // Returns native Java library, loads if necessary 537 static void* native_java_library(); 538 539 // Fills in path to jvm.dll/libjvm.so (used by the Disassembler) 540 static void jvm_path(char *buf, jint buflen); 541 542 // Returns true if we are running in a headless jre. 543 static bool is_headless_jre(); 544 545 // JNI names 546 static void print_jni_name_prefix_on(outputStream* st, int args_size); 547 static void print_jni_name_suffix_on(outputStream* st, int args_size); 548 549 // File conventions 550 static const char* file_separator(); 551 static const char* line_separator(); 552 static const char* path_separator(); 553 554 // Init os specific system properties values 555 static void init_system_properties_values(); 556 557 // IO operations, non-JVM_ version. 558 static int stat(const char* path, struct stat* sbuf); 559 static bool dir_is_empty(const char* path); 560 561 // IO operations on binary files 562 static int create_binary_file(const char* path, bool rewrite_existing); 563 static jlong current_file_offset(int fd); 564 static jlong seek_to_file_offset(int fd, jlong offset); 565 566 // Thread Local Storage 567 static int allocate_thread_local_storage(); 568 static void thread_local_storage_at_put(int index, void* value); 569 static void* thread_local_storage_at(int index); 570 static void free_thread_local_storage(int index); 571 572 // General allocation (must be MT-safe) 573 static void* malloc (size_t size); 574 static void* realloc (void *memblock, size_t size); 575 static void free (void *memblock); 576 static bool check_heap(bool force = false); // verify C heap integrity 577 static char* strdup(const char *); // Like strdup 578 579#ifndef PRODUCT 580 static julong num_mallocs; // # of calls to malloc/realloc 581 static julong alloc_bytes; // # of bytes allocated 582 static julong num_frees; // # of calls to free 583 static julong free_bytes; // # of bytes freed 584#endif 585 586 // SocketInterface (ex HPI SocketInterface ) 587 static int socket(int domain, int type, int protocol); 588 static int socket_close(int fd); 589 static int socket_shutdown(int fd, int howto); 590 static int recv(int fd, char* buf, size_t nBytes, uint flags); 591 static int send(int fd, char* buf, size_t nBytes, uint flags); 592 static int raw_send(int fd, char* buf, size_t nBytes, uint flags); 593 static int timeout(int fd, long timeout); 594 static int listen(int fd, int count); 595 static int connect(int fd, struct sockaddr* him, socklen_t len); 596 static int bind(int fd, struct sockaddr* him, socklen_t len); 597 static int accept(int fd, struct sockaddr* him, socklen_t* len); 598 static int recvfrom(int fd, char* buf, size_t nbytes, uint flags, 599 struct sockaddr* from, socklen_t* fromlen); 600 static int get_sock_name(int fd, struct sockaddr* him, socklen_t* len); 601 static int sendto(int fd, char* buf, size_t len, uint flags, 602 struct sockaddr* to, socklen_t tolen); 603 static int socket_available(int fd, jint* pbytes); 604 605 static int get_sock_opt(int fd, int level, int optname, 606 char* optval, socklen_t* optlen); 607 static int set_sock_opt(int fd, int level, int optname, 608 const char* optval, socklen_t optlen); 609 static int get_host_name(char* name, int namelen); 610 611 static struct hostent* get_host_by_name(char* name); 612 613 // Printing 64 bit integers 614 static const char* jlong_format_specifier(); 615 static const char* julong_format_specifier(); 616 617 // Support for signals (see JVM_RaiseSignal, JVM_RegisterSignal) 618 static void signal_init(); 619 static void signal_init_pd(); 620 static void signal_notify(int signal_number); 621 static void* signal(int signal_number, void* handler); 622 static void signal_raise(int signal_number); 623 static int signal_wait(); 624 static int signal_lookup(); 625 static void* user_handler(); 626 static void terminate_signal_thread(); 627 static int sigexitnum_pd(); 628 629 // random number generation 630 static long random(); // return 32bit pseudorandom number 631 static void init_random(long initval); // initialize random sequence 632 633 // Structured OS Exception support 634 static void os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread); 635 636 // On Windows this will create an actual minidump, on Linux/Solaris it will simply check core dump limits 637 static void check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize); 638 639 // JVMTI & JVM monitoring and management support 640 // The thread_cpu_time() and current_thread_cpu_time() are only 641 // supported if is_thread_cpu_time_supported() returns true. 642 // They are not supported on Solaris T1. 643 644 // Thread CPU Time - return the fast estimate on a platform 645 // On Solaris - call gethrvtime (fast) - user time only 646 // On Linux - fast clock_gettime where available - user+sys 647 // - otherwise: very slow /proc fs - user+sys 648 // On Windows - GetThreadTimes - user+sys 649 static jlong current_thread_cpu_time(); 650 static jlong thread_cpu_time(Thread* t); 651 652 // Thread CPU Time with user_sys_cpu_time parameter. 653 // 654 // If user_sys_cpu_time is true, user+sys time is returned. 655 // Otherwise, only user time is returned 656 static jlong current_thread_cpu_time(bool user_sys_cpu_time); 657 static jlong thread_cpu_time(Thread* t, bool user_sys_cpu_time); 658 659 // Return a bunch of info about the timers. 660 // Note that the returned info for these two functions may be different 661 // on some platforms 662 static void current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr); 663 static void thread_cpu_time_info(jvmtiTimerInfo *info_ptr); 664 665 static bool is_thread_cpu_time_supported(); 666 667 // System loadavg support. Returns -1 if load average cannot be obtained. 668 static int loadavg(double loadavg[], int nelem); 669 670 // Hook for os specific jvm options that we don't want to abort on seeing 671 static bool obsolete_option(const JavaVMOption *option); 672 673 // Read file line by line. If line is longer than bsize, 674 // rest of line is skipped. Returns number of bytes read or -1 on EOF 675 static int get_line_chars(int fd, char *buf, const size_t bsize); 676 677 // Extensions 678#include "runtime/os_ext.hpp" 679 680 public: 681 682 // Platform dependent stuff 683#ifdef TARGET_OS_FAMILY_linux 684# include "os_linux.hpp" 685#endif 686#ifdef TARGET_OS_FAMILY_solaris 687# include "os_solaris.hpp" 688#endif 689#ifdef TARGET_OS_FAMILY_windows 690# include "os_windows.hpp" 691#endif 692#ifdef TARGET_OS_FAMILY_bsd 693# include "os_bsd.hpp" 694#endif 695#ifdef TARGET_OS_ARCH_linux_x86 696# include "os_linux_x86.hpp" 697#endif 698#ifdef TARGET_OS_ARCH_linux_sparc 699# include "os_linux_sparc.hpp" 700#endif 701#ifdef TARGET_OS_ARCH_linux_zero 702# include "os_linux_zero.hpp" 703#endif 704#ifdef TARGET_OS_ARCH_solaris_x86 705# include "os_solaris_x86.hpp" 706#endif 707#ifdef TARGET_OS_ARCH_solaris_sparc 708# include "os_solaris_sparc.hpp" 709#endif 710#ifdef TARGET_OS_ARCH_windows_x86 711# include "os_windows_x86.hpp" 712#endif 713#ifdef TARGET_OS_ARCH_linux_arm 714# include "os_linux_arm.hpp" 715#endif 716#ifdef TARGET_OS_ARCH_linux_ppc 717# include "os_linux_ppc.hpp" 718#endif 719#ifdef TARGET_OS_ARCH_bsd_x86 720# include "os_bsd_x86.hpp" 721#endif 722#ifdef TARGET_OS_ARCH_bsd_zero 723# include "os_bsd_zero.hpp" 724#endif 725 726 public: 727 // debugging support (mostly used by debug.cpp but also fatal error handler) 728 static bool find(address pc, outputStream* st = tty); // OS specific function to make sense out of an address 729 730 static bool dont_yield(); // when true, JVM_Yield() is nop 731 static void print_statistics(); 732 733 // Thread priority helpers (implemented in OS-specific part) 734 static OSReturn set_native_priority(Thread* thread, int native_prio); 735 static OSReturn get_native_priority(const Thread* const thread, int* priority_ptr); 736 static int java_to_os_priority[MaxPriority + 1]; 737 // Hint to the underlying OS that a task switch would not be good. 738 // Void return because it's a hint and can fail. 739 static void hint_no_preempt(); 740 741 // Used at creation if requested by the diagnostic flag PauseAtStartup. 742 // Causes the VM to wait until an external stimulus has been applied 743 // (for Unix, that stimulus is a signal, for Windows, an external 744 // ResumeThread call) 745 static void pause(); 746 747 protected: 748 static long _rand_seed; // seed for random number generator 749 static int _processor_count; // number of processors 750 751 static char* format_boot_path(const char* format_string, 752 const char* home, 753 int home_len, 754 char fileSep, 755 char pathSep); 756 static bool set_boot_path(char fileSep, char pathSep); 757 static char** split_path(const char* path, int* n); 758}; 759 760// Note that "PAUSE" is almost always used with synchronization 761// so arguably we should provide Atomic::SpinPause() instead 762// of the global SpinPause() with C linkage. 763// It'd also be eligible for inlining on many platforms. 764 765extern "C" int SpinPause () ; 766extern "C" int SafeFetch32 (int * adr, int errValue) ; 767extern "C" intptr_t SafeFetchN (intptr_t * adr, intptr_t errValue) ; 768 769#endif // SHARE_VM_RUNTIME_OS_HPP 770