os.hpp revision 3934:730cc4ddd550
1/* 2 * Copyright (c) 1997, 2012, 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 CriticalPriority = 11 // Critical thread priority 79}; 80 81// Typedef for structured exception handling support 82typedef void (*java_call_t)(JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread); 83 84class os: AllStatic { 85 public: 86 enum { page_sizes_max = 9 }; // Size of _page_sizes array (8 plus a sentinel) 87 88 private: 89 static OSThread* _starting_thread; 90 static address _polling_page; 91 static volatile int32_t * _mem_serialize_page; 92 static uintptr_t _serialize_page_mask; 93 public: 94 static size_t _page_sizes[page_sizes_max]; 95 96 private: 97 static void init_page_sizes(size_t default_page_size) { 98 _page_sizes[0] = default_page_size; 99 _page_sizes[1] = 0; // sentinel 100 } 101 102 static char* pd_reserve_memory(size_t bytes, char* addr = 0, 103 size_t alignment_hint = 0); 104 static char* pd_attempt_reserve_memory_at(size_t bytes, char* addr); 105 static void pd_split_reserved_memory(char *base, size_t size, 106 size_t split, bool realloc); 107 static bool pd_commit_memory(char* addr, size_t bytes, bool executable = false); 108 static bool pd_commit_memory(char* addr, size_t size, size_t alignment_hint, 109 bool executable = false); 110 static bool pd_uncommit_memory(char* addr, size_t bytes); 111 static bool pd_release_memory(char* addr, size_t bytes); 112 113 static char* pd_map_memory(int fd, const char* file_name, size_t file_offset, 114 char *addr, size_t bytes, bool read_only = false, 115 bool allow_exec = false); 116 static char* pd_remap_memory(int fd, const char* file_name, size_t file_offset, 117 char *addr, size_t bytes, bool read_only, 118 bool allow_exec); 119 static bool pd_unmap_memory(char *addr, size_t bytes); 120 static void pd_free_memory(char *addr, size_t bytes, size_t alignment_hint); 121 static void pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint); 122 123 124 public: 125 static void init(void); // Called before command line parsing 126 static jint init_2(void); // Called after command line parsing 127 static void init_globals(void) { // Called from init_globals() in init.cpp 128 init_globals_ext(); 129 } 130 static void init_3(void); // Called at the end of vm init 131 132 // File names are case-insensitive on windows only 133 // Override me as needed 134 static int file_name_strcmp(const char* s1, const char* s2); 135 136 static bool getenv(const char* name, char* buffer, int len); 137 static bool have_special_privileges(); 138 139 static jlong javaTimeMillis(); 140 static jlong javaTimeNanos(); 141 static void javaTimeNanos_info(jvmtiTimerInfo *info_ptr); 142 static void run_periodic_checks(); 143 144 145 // Returns the elapsed time in seconds since the vm started. 146 static double elapsedTime(); 147 148 // Returns real time in seconds since an arbitrary point 149 // in the past. 150 static bool getTimesSecs(double* process_real_time, 151 double* process_user_time, 152 double* process_system_time); 153 154 // Interface to the performance counter 155 static jlong elapsed_counter(); 156 static jlong elapsed_frequency(); 157 158 // The "virtual time" of a thread is the amount of time a thread has 159 // actually run. The first function indicates whether the OS supports 160 // this functionality for the current thread, and if so: 161 // * the second enables vtime tracking (if that is required). 162 // * the third tells whether vtime is enabled. 163 // * the fourth returns the elapsed virtual time for the current 164 // thread. 165 static bool supports_vtime(); 166 static bool enable_vtime(); 167 static bool vtime_enabled(); 168 static double elapsedVTime(); 169 170 // Return current local time in a string (YYYY-MM-DD HH:MM:SS). 171 // It is MT safe, but not async-safe, as reading time zone 172 // information may require a lock on some platforms. 173 static char* local_time_string(char *buf, size_t buflen); 174 static struct tm* localtime_pd (const time_t* clock, struct tm* res); 175 // Fill in buffer with current local time as an ISO-8601 string. 176 // E.g., YYYY-MM-DDThh:mm:ss.mmm+zzzz. 177 // Returns buffer, or NULL if it failed. 178 static char* iso8601_time(char* buffer, size_t buffer_length); 179 180 // Interface for detecting multiprocessor system 181 static inline bool is_MP() { 182 assert(_processor_count > 0, "invalid processor count"); 183 return _processor_count > 1; 184 } 185 static julong available_memory(); 186 static julong physical_memory(); 187 static julong allocatable_physical_memory(julong size); 188 static bool is_server_class_machine(); 189 190 // number of CPUs 191 static int processor_count() { 192 return _processor_count; 193 } 194 static void set_processor_count(int count) { _processor_count = count; } 195 196 // Returns the number of CPUs this process is currently allowed to run on. 197 // Note that on some OSes this can change dynamically. 198 static int active_processor_count(); 199 200 // Bind processes to processors. 201 // This is a two step procedure: 202 // first you generate a distribution of processes to processors, 203 // then you bind processes according to that distribution. 204 // Compute a distribution for number of processes to processors. 205 // Stores the processor id's into the distribution array argument. 206 // Returns true if it worked, false if it didn't. 207 static bool distribute_processes(uint length, uint* distribution); 208 // Binds the current process to a processor. 209 // Returns true if it worked, false if it didn't. 210 static bool bind_to_processor(uint processor_id); 211 212 // Give a name to the current thread. 213 static void set_native_thread_name(const char *name); 214 215 // Interface for stack banging (predetect possible stack overflow for 216 // exception processing) There are guard pages, and above that shadow 217 // pages for stack overflow checking. 218 static bool uses_stack_guard_pages(); 219 static bool allocate_stack_guard_pages(); 220 static void bang_stack_shadow_pages(); 221 static bool stack_shadow_pages_available(Thread *thread, methodHandle method); 222 223 // OS interface to Virtual Memory 224 225 // Return the default page size. 226 static int vm_page_size(); 227 228 // Return the page size to use for a region of memory. The min_pages argument 229 // is a hint intended to limit fragmentation; it says the returned page size 230 // should be <= region_max_size / min_pages. Because min_pages is a hint, 231 // this routine may return a size larger than region_max_size / min_pages. 232 // 233 // The current implementation ignores min_pages if a larger page size is an 234 // exact multiple of both region_min_size and region_max_size. This allows 235 // larger pages to be used when doing so would not cause fragmentation; in 236 // particular, a single page can be used when region_min_size == 237 // region_max_size == a supported page size. 238 static size_t page_size_for_region(size_t region_min_size, 239 size_t region_max_size, 240 uint min_pages); 241 242 // Methods for tracing page sizes returned by the above method; enabled by 243 // TracePageSizes. The region_{min,max}_size parameters should be the values 244 // passed to page_size_for_region() and page_size should be the result of that 245 // call. The (optional) base and size parameters should come from the 246 // ReservedSpace base() and size() methods. 247 static void trace_page_sizes(const char* str, const size_t* page_sizes, 248 int count) PRODUCT_RETURN; 249 static void trace_page_sizes(const char* str, const size_t region_min_size, 250 const size_t region_max_size, 251 const size_t page_size, 252 const char* base = NULL, 253 const size_t size = 0) PRODUCT_RETURN; 254 255 static int vm_allocation_granularity(); 256 static char* reserve_memory(size_t bytes, char* addr = 0, 257 size_t alignment_hint = 0); 258 static char* reserve_memory_aligned(size_t size, size_t alignment); 259 static char* attempt_reserve_memory_at(size_t bytes, char* addr); 260 static void split_reserved_memory(char *base, size_t size, 261 size_t split, bool realloc); 262 static bool commit_memory(char* addr, size_t bytes, bool executable = false); 263 static bool commit_memory(char* addr, size_t size, size_t alignment_hint, 264 bool executable = false); 265 static bool uncommit_memory(char* addr, size_t bytes); 266 static bool release_memory(char* addr, size_t bytes); 267 268 enum ProtType { MEM_PROT_NONE, MEM_PROT_READ, MEM_PROT_RW, MEM_PROT_RWX }; 269 static bool protect_memory(char* addr, size_t bytes, ProtType prot, 270 bool is_committed = true); 271 272 static bool guard_memory(char* addr, size_t bytes); 273 static bool unguard_memory(char* addr, size_t bytes); 274 static bool create_stack_guard_pages(char* addr, size_t bytes); 275 static bool pd_create_stack_guard_pages(char* addr, size_t bytes); 276 static bool remove_stack_guard_pages(char* addr, size_t bytes); 277 278 static char* map_memory(int fd, const char* file_name, size_t file_offset, 279 char *addr, size_t bytes, bool read_only = false, 280 bool allow_exec = false); 281 static char* remap_memory(int fd, const char* file_name, size_t file_offset, 282 char *addr, size_t bytes, bool read_only, 283 bool allow_exec); 284 static bool unmap_memory(char *addr, size_t bytes); 285 static void free_memory(char *addr, size_t bytes, size_t alignment_hint); 286 static void realign_memory(char *addr, size_t bytes, size_t alignment_hint); 287 288 // NUMA-specific interface 289 static bool numa_has_static_binding(); 290 static bool numa_has_group_homing(); 291 static void numa_make_local(char *addr, size_t bytes, int lgrp_hint); 292 static void numa_make_global(char *addr, size_t bytes); 293 static size_t numa_get_groups_num(); 294 static size_t numa_get_leaf_groups(int *ids, size_t size); 295 static bool numa_topology_changed(); 296 static int numa_get_group_id(); 297 298 // Page manipulation 299 struct page_info { 300 size_t size; 301 int lgrp_id; 302 }; 303 static bool get_page_info(char *start, page_info* info); 304 static char* scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found); 305 306 static char* non_memory_address_word(); 307 // reserve, commit and pin the entire memory region 308 static char* reserve_memory_special(size_t size, char* addr = NULL, 309 bool executable = false); 310 static bool release_memory_special(char* addr, size_t bytes); 311 static void large_page_init(); 312 static size_t large_page_size(); 313 static bool can_commit_large_page_memory(); 314 static bool can_execute_large_page_memory(); 315 316 // OS interface to polling page 317 static address get_polling_page() { return _polling_page; } 318 static void set_polling_page(address page) { _polling_page = page; } 319 static bool is_poll_address(address addr) { return addr >= _polling_page && addr < (_polling_page + os::vm_page_size()); } 320 static void make_polling_page_unreadable(); 321 static void make_polling_page_readable(); 322 323 // Routines used to serialize the thread state without using membars 324 static void serialize_thread_states(); 325 326 // Since we write to the serialize page from every thread, we 327 // want stores to be on unique cache lines whenever possible 328 // in order to minimize CPU cross talk. We pre-compute the 329 // amount to shift the thread* to make this offset unique to 330 // each thread. 331 static int get_serialize_page_shift_count() { 332 return SerializePageShiftCount; 333 } 334 335 static void set_serialize_page_mask(uintptr_t mask) { 336 _serialize_page_mask = mask; 337 } 338 339 static unsigned int get_serialize_page_mask() { 340 return _serialize_page_mask; 341 } 342 343 static void set_memory_serialize_page(address page); 344 345 static address get_memory_serialize_page() { 346 return (address)_mem_serialize_page; 347 } 348 349 static inline void write_memory_serialize_page(JavaThread *thread) { 350 uintptr_t page_offset = ((uintptr_t)thread >> 351 get_serialize_page_shift_count()) & 352 get_serialize_page_mask(); 353 *(volatile int32_t *)((uintptr_t)_mem_serialize_page+page_offset) = 1; 354 } 355 356 static bool is_memory_serialize_page(JavaThread *thread, address addr) { 357 if (UseMembar) return false; 358 // Previously this function calculated the exact address of this 359 // thread's serialize page, and checked if the faulting address 360 // was equal. However, some platforms mask off faulting addresses 361 // to the page size, so now we just check that the address is 362 // within the page. This makes the thread argument unnecessary, 363 // but we retain the NULL check to preserve existing behaviour. 364 if (thread == NULL) return false; 365 address page = (address) _mem_serialize_page; 366 return addr >= page && addr < (page + os::vm_page_size()); 367 } 368 369 static void block_on_serialize_page_trap(); 370 371 // threads 372 373 enum ThreadType { 374 vm_thread, 375 cgc_thread, // Concurrent GC thread 376 pgc_thread, // Parallel GC thread 377 java_thread, 378 compiler_thread, 379 watcher_thread, 380 os_thread 381 }; 382 383 static bool create_thread(Thread* thread, 384 ThreadType thr_type, 385 size_t stack_size = 0); 386 static bool create_main_thread(JavaThread* thread); 387 static bool create_attached_thread(JavaThread* thread); 388 static void pd_start_thread(Thread* thread); 389 static void start_thread(Thread* thread); 390 391 static void initialize_thread(Thread* thr); 392 static void free_thread(OSThread* osthread); 393 394 // thread id on Linux/64bit is 64bit, on Windows and Solaris, it's 32bit 395 static intx current_thread_id(); 396 static int current_process_id(); 397 static int sleep(Thread* thread, jlong ms, bool interruptable); 398 static int naked_sleep(); 399 static void infinite_sleep(); // never returns, use with CAUTION 400 static void yield(); // Yields to all threads with same priority 401 enum YieldResult { 402 YIELD_SWITCHED = 1, // caller descheduled, other ready threads exist & ran 403 YIELD_NONEREADY = 0, // No other runnable/ready threads. 404 // platform-specific yield return immediately 405 YIELD_UNKNOWN = -1 // Unknown: platform doesn't support _SWITCHED or _NONEREADY 406 // YIELD_SWITCHED and YIELD_NONREADY imply the platform supports a "strong" 407 // yield that can be used in lieu of blocking. 408 } ; 409 static YieldResult NakedYield () ; 410 static void yield_all(int attempts = 0); // Yields to all other threads including lower priority 411 static void loop_breaker(int attempts); // called from within tight loops to possibly influence time-sharing 412 static OSReturn set_priority(Thread* thread, ThreadPriority priority); 413 static OSReturn get_priority(const Thread* const thread, ThreadPriority& priority); 414 415 static void interrupt(Thread* thread); 416 static bool is_interrupted(Thread* thread, bool clear_interrupted); 417 418 static int pd_self_suspend_thread(Thread* thread); 419 420 static ExtendedPC fetch_frame_from_context(void* ucVoid, intptr_t** sp, intptr_t** fp); 421 static frame fetch_frame_from_context(void* ucVoid); 422 423 static ExtendedPC get_thread_pc(Thread *thread); 424 static void breakpoint(); 425 426 static address current_stack_pointer(); 427 static address current_stack_base(); 428 static size_t current_stack_size(); 429 430 static void verify_stack_alignment() PRODUCT_RETURN; 431 432 static int message_box(const char* title, const char* message); 433 static char* do_you_want_to_debug(const char* message); 434 435 // run cmd in a separate process and return its exit code; or -1 on failures 436 static int fork_and_exec(char *cmd); 437 438 // Set file to send error reports. 439 static void set_error_file(const char *logfile); 440 441 // os::exit() is merged with vm_exit() 442 // static void exit(int num); 443 444 // Terminate the VM, but don't exit the process 445 static void shutdown(); 446 447 // Terminate with an error. Default is to generate a core file on platforms 448 // that support such things. This calls shutdown() and then aborts. 449 static void abort(bool dump_core = true); 450 451 // Die immediately, no exit hook, no abort hook, no cleanup. 452 static void die(); 453 454 // File i/o operations 455 static const int default_file_open_flags(); 456 static int open(const char *path, int oflag, int mode); 457 static int close(int fd); 458 static jlong lseek(int fd, jlong offset, int whence); 459 static char* native_path(char *path); 460 static int ftruncate(int fd, jlong length); 461 static int fsync(int fd); 462 static int available(int fd, jlong *bytes); 463 464 //File i/o operations 465 466 static size_t read(int fd, void *buf, unsigned int nBytes); 467 static size_t restartable_read(int fd, void *buf, unsigned int nBytes); 468 static size_t write(int fd, const void *buf, unsigned int nBytes); 469 470 // Reading directories. 471 static DIR* opendir(const char* dirname); 472 static int readdir_buf_size(const char *path); 473 static struct dirent* readdir(DIR* dirp, dirent* dbuf); 474 static int closedir(DIR* dirp); 475 476 // Dynamic library extension 477 static const char* dll_file_extension(); 478 479 static const char* get_temp_directory(); 480 static const char* get_current_directory(char *buf, int buflen); 481 482 // Builds a platform-specific full library path given a ld path and lib name 483 // Returns true if buffer contains full path to existing file, false otherwise 484 static bool dll_build_name(char* buffer, size_t size, 485 const char* pathname, const char* fname); 486 487 // Symbol lookup, find nearest function name; basically it implements 488 // dladdr() for all platforms. Name of the nearest function is copied 489 // to buf. Distance from its base address is returned as offset. 490 // If function name is not found, buf[0] is set to '\0' and offset is 491 // set to -1. 492 static bool dll_address_to_function_name(address addr, char* buf, 493 int buflen, int* offset); 494 495 // Locate DLL/DSO. On success, full path of the library is copied to 496 // buf, and offset is set to be the distance between addr and the 497 // library's base address. On failure, buf[0] is set to '\0' and 498 // offset is set to -1. 499 static bool dll_address_to_library_name(address addr, char* buf, 500 int buflen, int* offset); 501 502 // Find out whether the pc is in the static code for jvm.dll/libjvm.so. 503 static bool address_is_in_vm(address addr); 504 505 // Loads .dll/.so and 506 // in case of error it checks if .dll/.so was built for the 507 // same architecture as Hotspot is running on 508 static void* dll_load(const char *name, char *ebuf, int ebuflen); 509 510 // lookup symbol in a shared library 511 static void* dll_lookup(void* handle, const char* name); 512 513 // Unload library 514 static void dll_unload(void *lib); 515 516 // Print out system information; they are called by fatal error handler. 517 // Output format may be different on different platforms. 518 static void print_os_info(outputStream* st); 519 static void print_os_info_brief(outputStream* st); 520 static void print_cpu_info(outputStream* st); 521 static void pd_print_cpu_info(outputStream* st); 522 static void print_memory_info(outputStream* st); 523 static void print_dll_info(outputStream* st); 524 static void print_environment_variables(outputStream* st, const char** env_list, char* buffer, int len); 525 static void print_context(outputStream* st, void* context); 526 static void print_register_info(outputStream* st, void* context); 527 static void print_siginfo(outputStream* st, void* siginfo); 528 static void print_signal_handlers(outputStream* st, char* buf, size_t buflen); 529 static void print_date_and_time(outputStream* st); 530 531 static void print_location(outputStream* st, intptr_t x, bool verbose = false); 532 static size_t lasterror(char *buf, size_t len); 533 static int get_last_error(); 534 535 // Determines whether the calling process is being debugged by a user-mode debugger. 536 static bool is_debugger_attached(); 537 538 // wait for a key press if PauseAtExit is set 539 static void wait_for_keypress_at_exit(void); 540 541 // The following two functions are used by fatal error handler to trace 542 // native (C) frames. They are not part of frame.hpp/frame.cpp because 543 // frame.hpp/cpp assume thread is JavaThread, and also because different 544 // OS/compiler may have different convention or provide different API to 545 // walk C frames. 546 // 547 // We don't attempt to become a debugger, so we only follow frames if that 548 // does not require a lookup in the unwind table, which is part of the binary 549 // file but may be unsafe to read after a fatal error. So on x86, we can 550 // only walk stack if %ebp is used as frame pointer; on ia64, it's not 551 // possible to walk C stack without having the unwind table. 552 static bool is_first_C_frame(frame *fr); 553 static frame get_sender_for_C_frame(frame *fr); 554 555 // return current frame. pc() and sp() are set to NULL on failure. 556 static frame current_frame(); 557 558 static void print_hex_dump(outputStream* st, address start, address end, int unitsize); 559 560 // returns a string to describe the exception/signal; 561 // returns NULL if exception_code is not an OS exception/signal. 562 static const char* exception_name(int exception_code, char* buf, size_t buflen); 563 564 // Returns native Java library, loads if necessary 565 static void* native_java_library(); 566 567 // Fills in path to jvm.dll/libjvm.so (used by the Disassembler) 568 static void jvm_path(char *buf, jint buflen); 569 570 // Returns true if we are running in a headless jre. 571 static bool is_headless_jre(); 572 573 // JNI names 574 static void print_jni_name_prefix_on(outputStream* st, int args_size); 575 static void print_jni_name_suffix_on(outputStream* st, int args_size); 576 577 // File conventions 578 static const char* file_separator(); 579 static const char* line_separator(); 580 static const char* path_separator(); 581 582 // Init os specific system properties values 583 static void init_system_properties_values(); 584 585 // IO operations, non-JVM_ version. 586 static int stat(const char* path, struct stat* sbuf); 587 static bool dir_is_empty(const char* path); 588 589 // IO operations on binary files 590 static int create_binary_file(const char* path, bool rewrite_existing); 591 static jlong current_file_offset(int fd); 592 static jlong seek_to_file_offset(int fd, jlong offset); 593 594 // Thread Local Storage 595 static int allocate_thread_local_storage(); 596 static void thread_local_storage_at_put(int index, void* value); 597 static void* thread_local_storage_at(int index); 598 static void free_thread_local_storage(int index); 599 600 // Stack walk 601 static address get_caller_pc(int n = 0); 602 603 // General allocation (must be MT-safe) 604 static void* malloc (size_t size, MEMFLAGS flags, address caller_pc = 0); 605 static void* realloc (void *memblock, size_t size, MEMFLAGS flags, address caller_pc = 0); 606 static void free (void *memblock, MEMFLAGS flags = mtNone); 607 static bool check_heap(bool force = false); // verify C heap integrity 608 static char* strdup(const char *, MEMFLAGS flags = mtInternal); // Like strdup 609 610#ifndef PRODUCT 611 static julong num_mallocs; // # of calls to malloc/realloc 612 static julong alloc_bytes; // # of bytes allocated 613 static julong num_frees; // # of calls to free 614 static julong free_bytes; // # of bytes freed 615#endif 616 617 // SocketInterface (ex HPI SocketInterface ) 618 static int socket(int domain, int type, int protocol); 619 static int socket_close(int fd); 620 static int socket_shutdown(int fd, int howto); 621 static int recv(int fd, char* buf, size_t nBytes, uint flags); 622 static int send(int fd, char* buf, size_t nBytes, uint flags); 623 static int raw_send(int fd, char* buf, size_t nBytes, uint flags); 624 static int timeout(int fd, long timeout); 625 static int listen(int fd, int count); 626 static int connect(int fd, struct sockaddr* him, socklen_t len); 627 static int bind(int fd, struct sockaddr* him, socklen_t len); 628 static int accept(int fd, struct sockaddr* him, socklen_t* len); 629 static int recvfrom(int fd, char* buf, size_t nbytes, uint flags, 630 struct sockaddr* from, socklen_t* fromlen); 631 static int get_sock_name(int fd, struct sockaddr* him, socklen_t* len); 632 static int sendto(int fd, char* buf, size_t len, uint flags, 633 struct sockaddr* to, socklen_t tolen); 634 static int socket_available(int fd, jint* pbytes); 635 636 static int get_sock_opt(int fd, int level, int optname, 637 char* optval, socklen_t* optlen); 638 static int set_sock_opt(int fd, int level, int optname, 639 const char* optval, socklen_t optlen); 640 static int get_host_name(char* name, int namelen); 641 642 static struct hostent* get_host_by_name(char* name); 643 644 // Printing 64 bit integers 645 static const char* jlong_format_specifier(); 646 static const char* julong_format_specifier(); 647 648 // Support for signals (see JVM_RaiseSignal, JVM_RegisterSignal) 649 static void signal_init(); 650 static void signal_init_pd(); 651 static void signal_notify(int signal_number); 652 static void* signal(int signal_number, void* handler); 653 static void signal_raise(int signal_number); 654 static int signal_wait(); 655 static int signal_lookup(); 656 static void* user_handler(); 657 static void terminate_signal_thread(); 658 static int sigexitnum_pd(); 659 660 // random number generation 661 static long random(); // return 32bit pseudorandom number 662 static void init_random(long initval); // initialize random sequence 663 664 // Structured OS Exception support 665 static void os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread); 666 667 // On Windows this will create an actual minidump, on Linux/Solaris it will simply check core dump limits 668 static void check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize); 669 670 // Get the default path to the core file 671 // Returns the length of the string 672 static int get_core_path(char* buffer, size_t bufferSize); 673 674 // JVMTI & JVM monitoring and management support 675 // The thread_cpu_time() and current_thread_cpu_time() are only 676 // supported if is_thread_cpu_time_supported() returns true. 677 // They are not supported on Solaris T1. 678 679 // Thread CPU Time - return the fast estimate on a platform 680 // On Solaris - call gethrvtime (fast) - user time only 681 // On Linux - fast clock_gettime where available - user+sys 682 // - otherwise: very slow /proc fs - user+sys 683 // On Windows - GetThreadTimes - user+sys 684 static jlong current_thread_cpu_time(); 685 static jlong thread_cpu_time(Thread* t); 686 687 // Thread CPU Time with user_sys_cpu_time parameter. 688 // 689 // If user_sys_cpu_time is true, user+sys time is returned. 690 // Otherwise, only user time is returned 691 static jlong current_thread_cpu_time(bool user_sys_cpu_time); 692 static jlong thread_cpu_time(Thread* t, bool user_sys_cpu_time); 693 694 // Return a bunch of info about the timers. 695 // Note that the returned info for these two functions may be different 696 // on some platforms 697 static void current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr); 698 static void thread_cpu_time_info(jvmtiTimerInfo *info_ptr); 699 700 static bool is_thread_cpu_time_supported(); 701 702 // System loadavg support. Returns -1 if load average cannot be obtained. 703 static int loadavg(double loadavg[], int nelem); 704 705 // Hook for os specific jvm options that we don't want to abort on seeing 706 static bool obsolete_option(const JavaVMOption *option); 707 708 // Read file line by line. If line is longer than bsize, 709 // rest of line is skipped. Returns number of bytes read or -1 on EOF 710 static int get_line_chars(int fd, char *buf, const size_t bsize); 711 712 // Extensions 713#include "runtime/os_ext.hpp" 714 715 public: 716 717 // Platform dependent stuff 718#ifdef TARGET_OS_FAMILY_linux 719# include "os_linux.hpp" 720# include "os_posix.hpp" 721#endif 722#ifdef TARGET_OS_FAMILY_solaris 723# include "os_solaris.hpp" 724# include "os_posix.hpp" 725#endif 726#ifdef TARGET_OS_FAMILY_windows 727# include "os_windows.hpp" 728#endif 729#ifdef TARGET_OS_FAMILY_bsd 730# include "os_posix.hpp" 731# include "os_bsd.hpp" 732#endif 733#ifdef TARGET_OS_ARCH_linux_x86 734# include "os_linux_x86.hpp" 735#endif 736#ifdef TARGET_OS_ARCH_linux_sparc 737# include "os_linux_sparc.hpp" 738#endif 739#ifdef TARGET_OS_ARCH_linux_zero 740# include "os_linux_zero.hpp" 741#endif 742#ifdef TARGET_OS_ARCH_solaris_x86 743# include "os_solaris_x86.hpp" 744#endif 745#ifdef TARGET_OS_ARCH_solaris_sparc 746# include "os_solaris_sparc.hpp" 747#endif 748#ifdef TARGET_OS_ARCH_windows_x86 749# include "os_windows_x86.hpp" 750#endif 751#ifdef TARGET_OS_ARCH_linux_arm 752# include "os_linux_arm.hpp" 753#endif 754#ifdef TARGET_OS_ARCH_linux_ppc 755# include "os_linux_ppc.hpp" 756#endif 757#ifdef TARGET_OS_ARCH_bsd_x86 758# include "os_bsd_x86.hpp" 759#endif 760#ifdef TARGET_OS_ARCH_bsd_zero 761# include "os_bsd_zero.hpp" 762#endif 763 764 public: 765 // debugging support (mostly used by debug.cpp but also fatal error handler) 766 static bool find(address pc, outputStream* st = tty); // OS specific function to make sense out of an address 767 768 static bool dont_yield(); // when true, JVM_Yield() is nop 769 static void print_statistics(); 770 771 // Thread priority helpers (implemented in OS-specific part) 772 static OSReturn set_native_priority(Thread* thread, int native_prio); 773 static OSReturn get_native_priority(const Thread* const thread, int* priority_ptr); 774 static int java_to_os_priority[CriticalPriority + 1]; 775 // Hint to the underlying OS that a task switch would not be good. 776 // Void return because it's a hint and can fail. 777 static void hint_no_preempt(); 778 779 // Used at creation if requested by the diagnostic flag PauseAtStartup. 780 // Causes the VM to wait until an external stimulus has been applied 781 // (for Unix, that stimulus is a signal, for Windows, an external 782 // ResumeThread call) 783 static void pause(); 784 785 protected: 786 static long _rand_seed; // seed for random number generator 787 static int _processor_count; // number of processors 788 789 static char* format_boot_path(const char* format_string, 790 const char* home, 791 int home_len, 792 char fileSep, 793 char pathSep); 794 static bool set_boot_path(char fileSep, char pathSep); 795 static char** split_path(const char* path, int* n); 796}; 797 798// Note that "PAUSE" is almost always used with synchronization 799// so arguably we should provide Atomic::SpinPause() instead 800// of the global SpinPause() with C linkage. 801// It'd also be eligible for inlining on many platforms. 802 803extern "C" int SpinPause () ; 804extern "C" int SafeFetch32 (int * adr, int errValue) ; 805extern "C" intptr_t SafeFetchN (intptr_t * adr, intptr_t errValue) ; 806 807#endif // SHARE_VM_RUNTIME_OS_HPP 808