os.hpp revision 3171:da4be62fb889
1281843Sdteske/* 2222417Sjulian * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. 3222417Sjulian * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4222417Sjulian * 5222417Sjulian * This code is free software; you can redistribute it and/or modify it 6222417Sjulian * under the terms of the GNU General Public License version 2 only, as 7222417Sjulian * published by the Free Software Foundation. 8222417Sjulian * 9222417Sjulian * This code is distributed in the hope that it will be useful, but WITHOUT 10222417Sjulian * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11222417Sjulian * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12222417Sjulian * version 2 for more details (a copy is included in the LICENSE file that 13222417Sjulian * accompanied this code). 14222417Sjulian * 15222417Sjulian * You should have received a copy of the GNU General Public License version 16222417Sjulian * 2 along with this work; if not, write to the Free Software Foundation, 17222417Sjulian * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18222417Sjulian * 19222417Sjulian * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20222417Sjulian * or visit www.oracle.com if you need additional information or have any 21222417Sjulian * questions. 22222417Sjulian * 23222417Sjulian */ 24222417Sjulian 25222417Sjulian#ifndef SHARE_VM_RUNTIME_OS_HPP 26222417Sjulian#define SHARE_VM_RUNTIME_OS_HPP 27222417Sjulian 28222417Sjulian#include "jvmtifiles/jvmti.h" 29242667Sdteske#include "runtime/atomic.hpp" 30242667Sdteske#include "runtime/extendedPC.hpp" 31281843Sdteske#include "runtime/handles.hpp" 32281843Sdteske#include "utilities/top.hpp" 33241523Sdteske#ifdef TARGET_OS_FAMILY_linux 34241523Sdteske# include "jvm_linux.h" 35262701Sdteske#endif 36262701Sdteske#ifdef TARGET_OS_FAMILY_solaris 37241523Sdteske# include "jvm_solaris.h" 38281843Sdteske#endif 39281843Sdteske#ifdef TARGET_OS_FAMILY_windows 40243114Sdteske# include "jvm_windows.h" 41243660Sdteske#endif 42243660Sdteske#ifdef TARGET_OS_FAMILY_bsd 43243660Sdteske# include "jvm_bsd.h" 44243660Sdteske#endif 45243660Sdteske 46243660Sdteske// os defines the interface to operating system; this includes traditional 47243660Sdteske// OS services (time, I/O) as well as other functionality with system- 48243660Sdteske// dependent code. 49243660Sdteske 50243660Sdtesketypedef void (*dll_func)(...); 51243660Sdteske 52243660Sdteskeclass Thread; 53243660Sdteskeclass JavaThread; 54243660Sdteskeclass Event; 55243660Sdteskeclass DLL; 56243660Sdteskeclass FileHandle; 57243660Sdtesketemplate<class E> class GrowableArray; 58243660Sdteske 59243660Sdteske// %%%%% Moved ThreadState, START_FN, OSThread to new osThread.hpp. -- Rose 60243660Sdteske 61243660Sdteske// Platform-independent error return values from OS functions 62243660Sdteskeenum OSReturn { 63243660Sdteske OS_OK = 0, // Operation was successful 64243660Sdteske OS_ERR = -1, // Operation failed 65243660Sdteske OS_INTRPT = -2, // Operation was interrupted 66243660Sdteske OS_TIMEOUT = -3, // Operation timed out 67243660Sdteske OS_NOMEM = -5, // Operation failed for lack of memory 68243660Sdteske OS_NORESOURCE = -6 // Operation failed for lack of nonmemory resource 69243660Sdteske}; 70243660Sdteske 71243660Sdteskeenum ThreadPriority { // JLS 20.20.1-3 72243660Sdteske NoPriority = -1, // Initial non-priority value 73243660Sdteske MinPriority = 1, // Minimum priority 74281843Sdteske NormPriority = 5, // Normal (non-daemon) priority 75243660Sdteske NearMaxPriority = 9, // High priority, used for VMThread 76243660Sdteske MaxPriority = 10, // Highest priority, used for WatcherThread 77243660Sdteske // ensures that VMThread doesn't starve profiler 78243660Sdteske CriticalPriority = 11 // Critical thread priority 79243660Sdteske}; 80243660Sdteske 81243660Sdteske// Typedef for structured exception handling support 82243660Sdtesketypedef void (*java_call_t)(JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread); 83243660Sdteske 84243660Sdteskeclass os: AllStatic { 85243660Sdteske public: 86243114Sdteske enum { page_sizes_max = 9 }; // Size of _page_sizes array (8 plus a sentinel) 87243114Sdteske 88243114Sdteske private: 89222417Sjulian static OSThread* _starting_thread; 90222417Sjulian static address _polling_page; 91222417Sjulian static volatile int32_t * _mem_serialize_page; 92222417Sjulian static uintptr_t _serialize_page_mask; 93222417Sjulian public: 94222417Sjulian static size_t _page_sizes[page_sizes_max]; 95222417Sjulian 96222417Sjulian private: 97222417Sjulian static void init_page_sizes(size_t default_page_size) { 98222417Sjulian _page_sizes[0] = default_page_size; 99222417Sjulian _page_sizes[1] = 0; // sentinel 100222417Sjulian } 101222417Sjulian 102222417Sjulian public: 103222417Sjulian static void init(void); // Called before command line parsing 104222417Sjulian static jint init_2(void); // Called after command line parsing 105222417Sjulian static void init_globals(void) { // Called from init_globals() in init.cpp 106222417Sjulian init_globals_ext(); 107222417Sjulian } 108222417Sjulian static void init_3(void); // Called at the end of vm init 109222417Sjulian 110222417Sjulian // File names are case-insensitive on windows only 111222417Sjulian // Override me as needed 112222417Sjulian static int file_name_strcmp(const char* s1, const char* s2); 113222417Sjulian 114222417Sjulian static bool getenv(const char* name, char* buffer, int len); 115222417Sjulian static bool have_special_privileges(); 116243114Sdteske 117243114Sdteske static jlong javaTimeMillis(); 118243114Sdteske static jlong javaTimeNanos(); 119243114Sdteske static void javaTimeNanos_info(jvmtiTimerInfo *info_ptr); 120243114Sdteske static void run_periodic_checks(); 121243114Sdteske 122243114Sdteske 123243114Sdteske // Returns the elapsed time in seconds since the vm started. 124243114Sdteske static double elapsedTime(); 125243114Sdteske 126243114Sdteske // Returns real time in seconds since an arbitrary point 127243114Sdteske // in the past. 128243114Sdteske static bool getTimesSecs(double* process_real_time, 129243114Sdteske double* process_user_time, 130243114Sdteske double* process_system_time); 131243114Sdteske 132243114Sdteske // Interface to the performance counter 133243114Sdteske static jlong elapsed_counter(); 134243114Sdteske static jlong elapsed_frequency(); 135243114Sdteske 136243114Sdteske // The "virtual time" of a thread is the amount of time a thread has 137243114Sdteske // actually run. The first function indicates whether the OS supports 138243114Sdteske // this functionality for the current thread, and if so: 139243114Sdteske // * the second enables vtime tracking (if that is required). 140243114Sdteske // * the third tells whether vtime is enabled. 141243114Sdteske // * the fourth returns the elapsed virtual time for the current 142243114Sdteske // thread. 143243114Sdteske static bool supports_vtime(); 144243114Sdteske static bool enable_vtime(); 145243114Sdteske static bool vtime_enabled(); 146241523Sdteske static double elapsedVTime(); 147243114Sdteske 148241523Sdteske // Return current local time in a string (YYYY-MM-DD HH:MM:SS). 149241523Sdteske // It is MT safe, but not async-safe, as reading time zone 150241523Sdteske // information may require a lock on some platforms. 151241523Sdteske static char* local_time_string(char *buf, size_t buflen); 152222417Sjulian static struct tm* localtime_pd (const time_t* clock, struct tm* res); 153222417Sjulian // Fill in buffer with current local time as an ISO-8601 string. 154222417Sjulian // E.g., YYYY-MM-DDThh:mm:ss.mmm+zzzz. 155222417Sjulian // Returns buffer, or NULL if it failed. 156222417Sjulian static char* iso8601_time(char* buffer, size_t buffer_length); 157243114Sdteske 158243114Sdteske // Interface for detecting multiprocessor system 159222417Sjulian static inline bool is_MP() { 160243114Sdteske assert(_processor_count > 0, "invalid processor count"); 161222417Sjulian return _processor_count > 1; 162222417Sjulian } 163222417Sjulian static julong available_memory(); 164222417Sjulian static julong physical_memory(); 165222417Sjulian static julong allocatable_physical_memory(julong size); 166222417Sjulian static bool is_server_class_machine(); 167222417Sjulian 168243114Sdteske // number of CPUs 169243114Sdteske static int processor_count() { 170243114Sdteske return _processor_count; 171243114Sdteske } 172243114Sdteske static void set_processor_count(int count) { _processor_count = count; } 173243114Sdteske 174243114Sdteske // Returns the number of CPUs this process is currently allowed to run on. 175243114Sdteske // Note that on some OSes this can change dynamically. 176243114Sdteske static int active_processor_count(); 177243114Sdteske 178243114Sdteske // Bind processes to processors. 179243114Sdteske // This is a two step procedure: 180243114Sdteske // first you generate a distribution of processes to processors, 181243114Sdteske // then you bind processes according to that distribution. 182243114Sdteske // Compute a distribution for number of processes to processors. 183243114Sdteske // Stores the processor id's into the distribution array argument. 184243114Sdteske // Returns true if it worked, false if it didn't. 185243114Sdteske static bool distribute_processes(uint length, uint* distribution); 186241523Sdteske // Binds the current process to a processor. 187243114Sdteske // Returns true if it worked, false if it didn't. 188241523Sdteske static bool bind_to_processor(uint processor_id); 189241523Sdteske 190241523Sdteske // Give a name to the current thread. 191241523Sdteske static void set_native_thread_name(const char *name); 192222417Sjulian 193222417Sjulian // Interface for stack banging (predetect possible stack overflow for 194222417Sjulian // exception processing) There are guard pages, and above that shadow 195222417Sjulian // pages for stack overflow checking. 196222417Sjulian static bool uses_stack_guard_pages(); 197222417Sjulian static bool allocate_stack_guard_pages(); 198243114Sdteske static void bang_stack_shadow_pages(); 199243114Sdteske static bool stack_shadow_pages_available(Thread *thread, methodHandle method); 200222417Sjulian 201243114Sdteske // OS interface to Virtual Memory 202222417Sjulian 203222417Sjulian // Return the default page size. 204222417Sjulian static int vm_page_size(); 205222417Sjulian 206222417Sjulian // Return the page size to use for a region of memory. The min_pages argument 207243114Sdteske // is a hint intended to limit fragmentation; it says the returned page size 208243114Sdteske // should be <= region_max_size / min_pages. Because min_pages is a hint, 209243114Sdteske // this routine may return a size larger than region_max_size / min_pages. 210243114Sdteske // 211243114Sdteske // The current implementation ignores min_pages if a larger page size is an 212243114Sdteske // exact multiple of both region_min_size and region_max_size. This allows 213243114Sdteske // larger pages to be used when doing so would not cause fragmentation; in 214243114Sdteske // particular, a single page can be used when region_min_size == 215243114Sdteske // region_max_size == a supported page size. 216243114Sdteske static size_t page_size_for_region(size_t region_min_size, 217243114Sdteske size_t region_max_size, 218243114Sdteske uint min_pages); 219243114Sdteske 220243114Sdteske // Methods for tracing page sizes returned by the above method; enabled by 221243114Sdteske // TracePageSizes. The region_{min,max}_size parameters should be the values 222243114Sdteske // passed to page_size_for_region() and page_size should be the result of that 223243114Sdteske // call. The (optional) base and size parameters should come from the 224243114Sdteske // ReservedSpace base() and size() methods. 225241523Sdteske static void trace_page_sizes(const char* str, const size_t* page_sizes, 226243114Sdteske int count) PRODUCT_RETURN; 227241523Sdteske static void trace_page_sizes(const char* str, const size_t region_min_size, 228241523Sdteske const size_t region_max_size, 229241523Sdteske const size_t page_size, 230241523Sdteske const char* base = NULL, 231222417Sjulian const size_t size = 0) PRODUCT_RETURN; 232222417Sjulian 233222417Sjulian static int vm_allocation_granularity(); 234222417Sjulian static char* reserve_memory(size_t bytes, char* addr = 0, 235222417Sjulian size_t alignment_hint = 0); 236222417Sjulian static char* attempt_reserve_memory_at(size_t bytes, char* addr); 237243114Sdteske static void split_reserved_memory(char *base, size_t size, 238243114Sdteske size_t split, bool realloc); 239222417Sjulian static bool commit_memory(char* addr, size_t bytes, 240243114Sdteske bool executable = false); 241222417Sjulian static bool commit_memory(char* addr, size_t size, size_t alignment_hint, 242222417Sjulian bool executable = false); 243222417Sjulian static bool uncommit_memory(char* addr, size_t bytes); 244222417Sjulian static bool release_memory(char* addr, size_t bytes); 245222417Sjulian 246243114Sdteske enum ProtType { MEM_PROT_NONE, MEM_PROT_READ, MEM_PROT_RW, MEM_PROT_RWX }; 247243114Sdteske static bool protect_memory(char* addr, size_t bytes, ProtType prot, 248243114Sdteske bool is_committed = true); 249243114Sdteske 250222417Sjulian static bool guard_memory(char* addr, size_t bytes); 251222417Sjulian static bool unguard_memory(char* addr, size_t bytes); 252222417Sjulian static bool create_stack_guard_pages(char* addr, size_t bytes); 253222417Sjulian static bool remove_stack_guard_pages(char* addr, size_t bytes); 254222417Sjulian 255222417Sjulian static char* map_memory(int fd, const char* file_name, size_t file_offset, 256222417Sjulian char *addr, size_t bytes, bool read_only = false, 257222417Sjulian bool allow_exec = false); 258222417Sjulian static char* remap_memory(int fd, const char* file_name, size_t file_offset, 259222417Sjulian char *addr, size_t bytes, bool read_only, 260222417Sjulian bool allow_exec); 261222417Sjulian static bool unmap_memory(char *addr, size_t bytes); 262243114Sdteske static void free_memory(char *addr, size_t bytes, size_t alignment_hint); 263243114Sdteske static void realign_memory(char *addr, size_t bytes, size_t alignment_hint); 264243114Sdteske 265243114Sdteske // NUMA-specific interface 266241523Sdteske static bool numa_has_static_binding(); 267243114Sdteske static bool numa_has_group_homing(); 268241523Sdteske static void numa_make_local(char *addr, size_t bytes, int lgrp_hint); 269241523Sdteske static void numa_make_global(char *addr, size_t bytes); 270241523Sdteske static size_t numa_get_groups_num(); 271241523Sdteske static size_t numa_get_leaf_groups(int *ids, size_t size); 272241523Sdteske static bool numa_topology_changed(); 273241523Sdteske static int numa_get_group_id(); 274241523Sdteske 275241523Sdteske // Page manipulation 276241523Sdteske struct page_info { 277241523Sdteske size_t size; 278241523Sdteske int lgrp_id; 279243114Sdteske }; 280243114Sdteske static bool get_page_info(char *start, page_info* info); 281243114Sdteske static char* scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found); 282243114Sdteske 283241523Sdteske static char* non_memory_address_word(); 284241523Sdteske // reserve, commit and pin the entire memory region 285241523Sdteske static char* reserve_memory_special(size_t size, char* addr = NULL, 286241523Sdteske bool executable = false); 287241523Sdteske static bool release_memory_special(char* addr, size_t bytes); 288262701Sdteske static void large_page_init(); 289262701Sdteske static size_t large_page_size(); 290262701Sdteske static bool can_commit_large_page_memory(); 291262701Sdteske static bool can_execute_large_page_memory(); 292222417Sjulian 293222417Sjulian // OS interface to polling page 294262701Sdteske static address get_polling_page() { return _polling_page; } 295262701Sdteske static void set_polling_page(address page) { _polling_page = page; } 296262701Sdteske static bool is_poll_address(address addr) { return addr >= _polling_page && addr < (_polling_page + os::vm_page_size()); } 297222417Sjulian static void make_polling_page_unreadable(); 298262701Sdteske static void make_polling_page_readable(); 299262701Sdteske 300262701Sdteske // Routines used to serialize the thread state without using membars 301262701Sdteske static void serialize_thread_states(); 302262701Sdteske 303222417Sjulian // Since we write to the serialize page from every thread, we 304222417Sjulian // want stores to be on unique cache lines whenever possible 305243114Sdteske // in order to minimize CPU cross talk. We pre-compute the 306243114Sdteske // amount to shift the thread* to make this offset unique to 307243114Sdteske // each thread. 308243114Sdteske static int get_serialize_page_shift_count() { 309241523Sdteske return SerializePageShiftCount; 310241523Sdteske } 311241523Sdteske 312241523Sdteske static void set_serialize_page_mask(uintptr_t mask) { 313241523Sdteske _serialize_page_mask = mask; 314262701Sdteske } 315262701Sdteske 316262701Sdteske static unsigned int get_serialize_page_mask() { 317262701Sdteske return _serialize_page_mask; 318222417Sjulian } 319241367Sdteske 320262701Sdteske static void set_memory_serialize_page(address page); 321262701Sdteske 322262701Sdteske static address get_memory_serialize_page() { 323222417Sjulian return (address)_mem_serialize_page; 324262701Sdteske } 325262701Sdteske 326262701Sdteske static inline void write_memory_serialize_page(JavaThread *thread) { 327262701Sdteske uintptr_t page_offset = ((uintptr_t)thread >> 328262701Sdteske get_serialize_page_shift_count()) & 329222417Sjulian get_serialize_page_mask(); 330242667Sdteske *(volatile int32_t *)((uintptr_t)_mem_serialize_page+page_offset) = 1; 331243114Sdteske } 332243114Sdteske 333243114Sdteske static bool is_memory_serialize_page(JavaThread *thread, address addr) { 334243114Sdteske if (UseMembar) return false; 335242667Sdteske // Previously this function calculated the exact address of this 336242667Sdteske // thread's serialize page, and checked if the faulting address 337242667Sdteske // was equal. However, some platforms mask off faulting addresses 338242667Sdteske // to the page size, so now we just check that the address is 339242667Sdteske // within the page. This makes the thread argument unnecessary, 340242667Sdteske // but we retain the NULL check to preserve existing behaviour. 341243660Sdteske if (thread == NULL) return false; 342243660Sdteske address page = (address) _mem_serialize_page; 343243660Sdteske return addr >= page && addr < (page + os::vm_page_size()); 344243660Sdteske } 345243660Sdteske 346243660Sdteske static void block_on_serialize_page_trap(); 347243660Sdteske 348243660Sdteske // threads 349243660Sdteske 350243660Sdteske enum ThreadType { 351243660Sdteske vm_thread, 352243660Sdteske cgc_thread, // Concurrent GC thread 353281843Sdteske pgc_thread, // Parallel GC thread 354281843Sdteske java_thread, 355 compiler_thread, 356 watcher_thread, 357 os_thread 358 }; 359 360 static bool create_thread(Thread* thread, 361 ThreadType thr_type, 362 size_t stack_size = 0); 363 static bool create_main_thread(JavaThread* thread); 364 static bool create_attached_thread(JavaThread* thread); 365 static void pd_start_thread(Thread* thread); 366 static void start_thread(Thread* thread); 367 368 static void initialize_thread(); 369 static void free_thread(OSThread* osthread); 370 371 // thread id on Linux/64bit is 64bit, on Windows and Solaris, it's 32bit 372 static intx current_thread_id(); 373 static int current_process_id(); 374 static int sleep(Thread* thread, jlong ms, bool interruptable); 375 static int naked_sleep(); 376 static void infinite_sleep(); // never returns, use with CAUTION 377 static void yield(); // Yields to all threads with same priority 378 enum YieldResult { 379 YIELD_SWITCHED = 1, // caller descheduled, other ready threads exist & ran 380 YIELD_NONEREADY = 0, // No other runnable/ready threads. 381 // platform-specific yield return immediately 382 YIELD_UNKNOWN = -1 // Unknown: platform doesn't support _SWITCHED or _NONEREADY 383 // YIELD_SWITCHED and YIELD_NONREADY imply the platform supports a "strong" 384 // yield that can be used in lieu of blocking. 385 } ; 386 static YieldResult NakedYield () ; 387 static void yield_all(int attempts = 0); // Yields to all other threads including lower priority 388 static void loop_breaker(int attempts); // called from within tight loops to possibly influence time-sharing 389 static OSReturn set_priority(Thread* thread, ThreadPriority priority); 390 static OSReturn get_priority(const Thread* const thread, ThreadPriority& priority); 391 392 static void interrupt(Thread* thread); 393 static bool is_interrupted(Thread* thread, bool clear_interrupted); 394 395 static int pd_self_suspend_thread(Thread* thread); 396 397 static ExtendedPC fetch_frame_from_context(void* ucVoid, intptr_t** sp, intptr_t** fp); 398 static frame fetch_frame_from_context(void* ucVoid); 399 400 static ExtendedPC get_thread_pc(Thread *thread); 401 static void breakpoint(); 402 403 static address current_stack_pointer(); 404 static address current_stack_base(); 405 static size_t current_stack_size(); 406 407 static void verify_stack_alignment() PRODUCT_RETURN; 408 409 static int message_box(const char* title, const char* message); 410 static char* do_you_want_to_debug(const char* message); 411 412 // run cmd in a separate process and return its exit code; or -1 on failures 413 static int fork_and_exec(char *cmd); 414 415 // Set file to send error reports. 416 static void set_error_file(const char *logfile); 417 418 // os::exit() is merged with vm_exit() 419 // static void exit(int num); 420 421 // Terminate the VM, but don't exit the process 422 static void shutdown(); 423 424 // Terminate with an error. Default is to generate a core file on platforms 425 // that support such things. This calls shutdown() and then aborts. 426 static void abort(bool dump_core = true); 427 428 // Die immediately, no exit hook, no abort hook, no cleanup. 429 static void die(); 430 431 // File i/o operations 432 static const int default_file_open_flags(); 433 static int open(const char *path, int oflag, int mode); 434 static int close(int fd); 435 static jlong lseek(int fd, jlong offset, int whence); 436 static char* native_path(char *path); 437 static int ftruncate(int fd, jlong length); 438 static int fsync(int fd); 439 static int available(int fd, jlong *bytes); 440 441 //File i/o operations 442 443 static size_t read(int fd, void *buf, unsigned int nBytes); 444 static size_t restartable_read(int fd, void *buf, unsigned int nBytes); 445 static size_t write(int fd, const void *buf, unsigned int nBytes); 446 447 // Reading directories. 448 static DIR* opendir(const char* dirname); 449 static int readdir_buf_size(const char *path); 450 static struct dirent* readdir(DIR* dirp, dirent* dbuf); 451 static int closedir(DIR* dirp); 452 453 // Dynamic library extension 454 static const char* dll_file_extension(); 455 456 static const char* get_temp_directory(); 457 static const char* get_current_directory(char *buf, int buflen); 458 459 // Builds a platform-specific full library path given a ld path and lib name 460 static void dll_build_name(char* buffer, size_t size, 461 const char* pathname, const char* fname); 462 463 // Symbol lookup, find nearest function name; basically it implements 464 // dladdr() for all platforms. Name of the nearest function is copied 465 // to buf. Distance from its base address is returned as offset. 466 // If function name is not found, buf[0] is set to '\0' and offset is 467 // set to -1. 468 static bool dll_address_to_function_name(address addr, char* buf, 469 int buflen, int* offset); 470 471 // Locate DLL/DSO. On success, full path of the library is copied to 472 // buf, and offset is set to be the distance between addr and the 473 // library's base address. On failure, buf[0] is set to '\0' and 474 // offset is set to -1. 475 static bool dll_address_to_library_name(address addr, char* buf, 476 int buflen, int* offset); 477 478 // Find out whether the pc is in the static code for jvm.dll/libjvm.so. 479 static bool address_is_in_vm(address addr); 480 481 // Loads .dll/.so and 482 // in case of error it checks if .dll/.so was built for the 483 // same architecture as Hotspot is running on 484 static void* dll_load(const char *name, char *ebuf, int ebuflen); 485 486 // lookup symbol in a shared library 487 static void* dll_lookup(void* handle, const char* name); 488 489 // Unload library 490 static void dll_unload(void *lib); 491 492 // Print out system information; they are called by fatal error handler. 493 // Output format may be different on different platforms. 494 static void print_os_info(outputStream* st); 495 static void print_cpu_info(outputStream* st); 496 static void pd_print_cpu_info(outputStream* st); 497 static void print_memory_info(outputStream* st); 498 static void print_dll_info(outputStream* st); 499 static void print_environment_variables(outputStream* st, const char** env_list, char* buffer, int len); 500 static void print_context(outputStream* st, void* context); 501 static void print_register_info(outputStream* st, void* context); 502 static void print_siginfo(outputStream* st, void* siginfo); 503 static void print_signal_handlers(outputStream* st, char* buf, size_t buflen); 504 static void print_date_and_time(outputStream* st); 505 506 static void print_location(outputStream* st, intptr_t x, bool verbose = false); 507 static size_t lasterror(char *buf, size_t len); 508 static int get_last_error(); 509 510 // Determines whether the calling process is being debugged by a user-mode debugger. 511 static bool is_debugger_attached(); 512 513 // wait for a key press if PauseAtExit is set 514 static void wait_for_keypress_at_exit(void); 515 516 // The following two functions are used by fatal error handler to trace 517 // native (C) frames. They are not part of frame.hpp/frame.cpp because 518 // frame.hpp/cpp assume thread is JavaThread, and also because different 519 // OS/compiler may have different convention or provide different API to 520 // walk C frames. 521 // 522 // We don't attempt to become a debugger, so we only follow frames if that 523 // does not require a lookup in the unwind table, which is part of the binary 524 // file but may be unsafe to read after a fatal error. So on x86, we can 525 // only walk stack if %ebp is used as frame pointer; on ia64, it's not 526 // possible to walk C stack without having the unwind table. 527 static bool is_first_C_frame(frame *fr); 528 static frame get_sender_for_C_frame(frame *fr); 529 530 // return current frame. pc() and sp() are set to NULL on failure. 531 static frame current_frame(); 532 533 static void print_hex_dump(outputStream* st, address start, address end, int unitsize); 534 535 // returns a string to describe the exception/signal; 536 // returns NULL if exception_code is not an OS exception/signal. 537 static const char* exception_name(int exception_code, char* buf, size_t buflen); 538 539 // Returns native Java library, loads if necessary 540 static void* native_java_library(); 541 542 // Fills in path to jvm.dll/libjvm.so (used by the Disassembler) 543 static void jvm_path(char *buf, jint buflen); 544 545 // Returns true if we are running in a headless jre. 546 static bool is_headless_jre(); 547 548 // JNI names 549 static void print_jni_name_prefix_on(outputStream* st, int args_size); 550 static void print_jni_name_suffix_on(outputStream* st, int args_size); 551 552 // File conventions 553 static const char* file_separator(); 554 static const char* line_separator(); 555 static const char* path_separator(); 556 557 // Init os specific system properties values 558 static void init_system_properties_values(); 559 560 // IO operations, non-JVM_ version. 561 static int stat(const char* path, struct stat* sbuf); 562 static bool dir_is_empty(const char* path); 563 564 // IO operations on binary files 565 static int create_binary_file(const char* path, bool rewrite_existing); 566 static jlong current_file_offset(int fd); 567 static jlong seek_to_file_offset(int fd, jlong offset); 568 569 // Thread Local Storage 570 static int allocate_thread_local_storage(); 571 static void thread_local_storage_at_put(int index, void* value); 572 static void* thread_local_storage_at(int index); 573 static void free_thread_local_storage(int index); 574 575 // General allocation (must be MT-safe) 576 static void* malloc (size_t size); 577 static void* realloc (void *memblock, size_t size); 578 static void free (void *memblock); 579 static bool check_heap(bool force = false); // verify C heap integrity 580 static char* strdup(const char *); // Like strdup 581 582#ifndef PRODUCT 583 static julong num_mallocs; // # of calls to malloc/realloc 584 static julong alloc_bytes; // # of bytes allocated 585 static julong num_frees; // # of calls to free 586 static julong free_bytes; // # of bytes freed 587#endif 588 589 // SocketInterface (ex HPI SocketInterface ) 590 static int socket(int domain, int type, int protocol); 591 static int socket_close(int fd); 592 static int socket_shutdown(int fd, int howto); 593 static int recv(int fd, char* buf, size_t nBytes, uint flags); 594 static int send(int fd, char* buf, size_t nBytes, uint flags); 595 static int raw_send(int fd, char* buf, size_t nBytes, uint flags); 596 static int timeout(int fd, long timeout); 597 static int listen(int fd, int count); 598 static int connect(int fd, struct sockaddr* him, socklen_t len); 599 static int bind(int fd, struct sockaddr* him, socklen_t len); 600 static int accept(int fd, struct sockaddr* him, socklen_t* len); 601 static int recvfrom(int fd, char* buf, size_t nbytes, uint flags, 602 struct sockaddr* from, socklen_t* fromlen); 603 static int get_sock_name(int fd, struct sockaddr* him, socklen_t* len); 604 static int sendto(int fd, char* buf, size_t len, uint flags, 605 struct sockaddr* to, socklen_t tolen); 606 static int socket_available(int fd, jint* pbytes); 607 608 static int get_sock_opt(int fd, int level, int optname, 609 char* optval, socklen_t* optlen); 610 static int set_sock_opt(int fd, int level, int optname, 611 const char* optval, socklen_t optlen); 612 static int get_host_name(char* name, int namelen); 613 614 static struct hostent* get_host_by_name(char* name); 615 616 // Printing 64 bit integers 617 static const char* jlong_format_specifier(); 618 static const char* julong_format_specifier(); 619 620 // Support for signals (see JVM_RaiseSignal, JVM_RegisterSignal) 621 static void signal_init(); 622 static void signal_init_pd(); 623 static void signal_notify(int signal_number); 624 static void* signal(int signal_number, void* handler); 625 static void signal_raise(int signal_number); 626 static int signal_wait(); 627 static int signal_lookup(); 628 static void* user_handler(); 629 static void terminate_signal_thread(); 630 static int sigexitnum_pd(); 631 632 // random number generation 633 static long random(); // return 32bit pseudorandom number 634 static void init_random(long initval); // initialize random sequence 635 636 // Structured OS Exception support 637 static void os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread); 638 639 // On Windows this will create an actual minidump, on Linux/Solaris it will simply check core dump limits 640 static void check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize); 641 642 // JVMTI & JVM monitoring and management support 643 // The thread_cpu_time() and current_thread_cpu_time() are only 644 // supported if is_thread_cpu_time_supported() returns true. 645 // They are not supported on Solaris T1. 646 647 // Thread CPU Time - return the fast estimate on a platform 648 // On Solaris - call gethrvtime (fast) - user time only 649 // On Linux - fast clock_gettime where available - user+sys 650 // - otherwise: very slow /proc fs - user+sys 651 // On Windows - GetThreadTimes - user+sys 652 static jlong current_thread_cpu_time(); 653 static jlong thread_cpu_time(Thread* t); 654 655 // Thread CPU Time with user_sys_cpu_time parameter. 656 // 657 // If user_sys_cpu_time is true, user+sys time is returned. 658 // Otherwise, only user time is returned 659 static jlong current_thread_cpu_time(bool user_sys_cpu_time); 660 static jlong thread_cpu_time(Thread* t, bool user_sys_cpu_time); 661 662 // Return a bunch of info about the timers. 663 // Note that the returned info for these two functions may be different 664 // on some platforms 665 static void current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr); 666 static void thread_cpu_time_info(jvmtiTimerInfo *info_ptr); 667 668 static bool is_thread_cpu_time_supported(); 669 670 // System loadavg support. Returns -1 if load average cannot be obtained. 671 static int loadavg(double loadavg[], int nelem); 672 673 // Hook for os specific jvm options that we don't want to abort on seeing 674 static bool obsolete_option(const JavaVMOption *option); 675 676 // Read file line by line. If line is longer than bsize, 677 // rest of line is skipped. Returns number of bytes read or -1 on EOF 678 static int get_line_chars(int fd, char *buf, const size_t bsize); 679 680 // Extensions 681#include "runtime/os_ext.hpp" 682 683 public: 684 685 // Platform dependent stuff 686#ifdef TARGET_OS_FAMILY_linux 687# include "os_linux.hpp" 688#endif 689#ifdef TARGET_OS_FAMILY_solaris 690# include "os_solaris.hpp" 691#endif 692#ifdef TARGET_OS_FAMILY_windows 693# include "os_windows.hpp" 694#endif 695#ifdef TARGET_OS_FAMILY_bsd 696# include "os_bsd.hpp" 697#endif 698#ifdef TARGET_OS_ARCH_linux_x86 699# include "os_linux_x86.hpp" 700#endif 701#ifdef TARGET_OS_ARCH_linux_sparc 702# include "os_linux_sparc.hpp" 703#endif 704#ifdef TARGET_OS_ARCH_linux_zero 705# include "os_linux_zero.hpp" 706#endif 707#ifdef TARGET_OS_ARCH_solaris_x86 708# include "os_solaris_x86.hpp" 709#endif 710#ifdef TARGET_OS_ARCH_solaris_sparc 711# include "os_solaris_sparc.hpp" 712#endif 713#ifdef TARGET_OS_ARCH_windows_x86 714# include "os_windows_x86.hpp" 715#endif 716#ifdef TARGET_OS_ARCH_linux_arm 717# include "os_linux_arm.hpp" 718#endif 719#ifdef TARGET_OS_ARCH_linux_ppc 720# include "os_linux_ppc.hpp" 721#endif 722#ifdef TARGET_OS_ARCH_bsd_x86 723# include "os_bsd_x86.hpp" 724#endif 725#ifdef TARGET_OS_ARCH_bsd_zero 726# include "os_bsd_zero.hpp" 727#endif 728 729 public: 730 // debugging support (mostly used by debug.cpp but also fatal error handler) 731 static bool find(address pc, outputStream* st = tty); // OS specific function to make sense out of an address 732 733 static bool dont_yield(); // when true, JVM_Yield() is nop 734 static void print_statistics(); 735 736 // Thread priority helpers (implemented in OS-specific part) 737 static OSReturn set_native_priority(Thread* thread, int native_prio); 738 static OSReturn get_native_priority(const Thread* const thread, int* priority_ptr); 739 static int java_to_os_priority[CriticalPriority + 1]; 740 // Hint to the underlying OS that a task switch would not be good. 741 // Void return because it's a hint and can fail. 742 static void hint_no_preempt(); 743 744 // Used at creation if requested by the diagnostic flag PauseAtStartup. 745 // Causes the VM to wait until an external stimulus has been applied 746 // (for Unix, that stimulus is a signal, for Windows, an external 747 // ResumeThread call) 748 static void pause(); 749 750 protected: 751 static long _rand_seed; // seed for random number generator 752 static int _processor_count; // number of processors 753 754 static char* format_boot_path(const char* format_string, 755 const char* home, 756 int home_len, 757 char fileSep, 758 char pathSep); 759 static bool set_boot_path(char fileSep, char pathSep); 760 static char** split_path(const char* path, int* n); 761}; 762 763// Note that "PAUSE" is almost always used with synchronization 764// so arguably we should provide Atomic::SpinPause() instead 765// of the global SpinPause() with C linkage. 766// It'd also be eligible for inlining on many platforms. 767 768extern "C" int SpinPause () ; 769extern "C" int SafeFetch32 (int * adr, int errValue) ; 770extern "C" intptr_t SafeFetchN (intptr_t * adr, intptr_t errValue) ; 771 772#endif // SHARE_VM_RUNTIME_OS_HPP 773