1 /* 2 * Copyright (c) 1997, 2013, 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 # include <setjmp.h> 36 #endif 37 #ifdef TARGET_OS_FAMILY_solaris 38 # include "jvm_solaris.h" 39 # include <setjmp.h> 40 #endif 41 #ifdef TARGET_OS_FAMILY_windows 42 # include "jvm_windows.h" 43 #endif 44 #ifdef TARGET_OS_FAMILY_bsd 45 # include "jvm_bsd.h" 46 # include <setjmp.h> 47 #endif 48 49 // os defines the interface to operating system; this includes traditional 50 // OS services (time, I/O) as well as other functionality with system- 51 // dependent code. 52 53 typedef void (*dll_func)(...); 54 55 class Thread; 56 class JavaThread; 57 class Event; 58 class DLL; 59 class FileHandle; 60 template<class E> class GrowableArray; 61 62 // %%%%% Moved ThreadState, START_FN, OSThread to new osThread.hpp. -- Rose 63 64 // Platform-independent error return values from OS functions 65 enum OSReturn { 66 OS_OK = 0, // Operation was successful 67 OS_ERR = -1, // Operation failed 68 OS_INTRPT = -2, // Operation was interrupted 69 OS_TIMEOUT = -3, // Operation timed out 70 OS_NOMEM = -5, // Operation failed for lack of memory 71 OS_NORESOURCE = -6 // Operation failed for lack of nonmemory resource 72 }; 73 74 enum ThreadPriority { // JLS 20.20.1-3 75 NoPriority = -1, // Initial non-priority value 76 MinPriority = 1, // Minimum priority 77 NormPriority = 5, // Normal (non-daemon) priority 78 NearMaxPriority = 9, // High priority, used for VMThread 79 MaxPriority = 10, // Highest priority, used for WatcherThread 80 // ensures that VMThread doesn't starve profiler 81 CriticalPriority = 11 // Critical thread priority 82 }; 83 84 // Executable parameter flag for os::commit_memory() and 85 // os::commit_memory_or_exit(). 86 const bool ExecMem = true; 87 88 // Typedef for structured exception handling support 89 typedef void (*java_call_t)(JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread); 90 91 class os: AllStatic { 92 public: 93 enum { page_sizes_max = 9 }; // Size of _page_sizes array (8 plus a sentinel) 94 95 private: 96 static OSThread* _starting_thread; 97 static address _polling_page; 98 static volatile int32_t * _mem_serialize_page; 99 static uintptr_t _serialize_page_mask; 100 public: 101 static size_t _page_sizes[page_sizes_max]; 102 103 private: 104 static void init_page_sizes(size_t default_page_size) { 105 _page_sizes[0] = default_page_size; 106 _page_sizes[1] = 0; // sentinel 107 } 108 109 static char* pd_reserve_memory(size_t bytes, char* addr = 0, 110 size_t alignment_hint = 0); 111 static char* pd_attempt_reserve_memory_at(size_t bytes, char* addr); 112 static void pd_split_reserved_memory(char *base, size_t size, 113 size_t split, bool realloc); 114 static bool pd_commit_memory(char* addr, size_t bytes, bool executable); 115 static bool pd_commit_memory(char* addr, size_t size, size_t alignment_hint, 116 bool executable); 117 // Same as pd_commit_memory() that either succeeds or calls 118 // vm_exit_out_of_memory() with the specified mesg. 119 static void pd_commit_memory_or_exit(char* addr, size_t bytes, 120 bool executable, const char* mesg); 121 static void pd_commit_memory_or_exit(char* addr, size_t size, 122 size_t alignment_hint, 123 bool executable, const char* mesg); 124 static bool pd_uncommit_memory(char* addr, size_t bytes); 125 static bool pd_release_memory(char* addr, size_t bytes); 126 127 static char* pd_map_memory(int fd, const char* file_name, size_t file_offset, 128 char *addr, size_t bytes, bool read_only = false, 129 bool allow_exec = false); 130 static char* pd_remap_memory(int fd, const char* file_name, size_t file_offset, 131 char *addr, size_t bytes, bool read_only, 132 bool allow_exec); 133 static bool pd_unmap_memory(char *addr, size_t bytes); 134 static void pd_free_memory(char *addr, size_t bytes, size_t alignment_hint); 135 static void pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint); 136 137 138 public: 139 static void init(void); // Called before command line parsing 140 static jint init_2(void); // Called after command line parsing 141 static void init_globals(void) { // Called from init_globals() in init.cpp 142 init_globals_ext(); 143 } 144 static void init_3(void); // Called at the end of vm init 145 146 // File names are case-insensitive on windows only 147 // Override me as needed 148 static int file_name_strcmp(const char* s1, const char* s2); 149 150 static bool getenv(const char* name, char* buffer, int len); 151 static bool have_special_privileges(); 152 153 static jlong javaTimeMillis(); 154 static jlong javaTimeNanos(); 155 static void javaTimeNanos_info(jvmtiTimerInfo *info_ptr); 156 static void run_periodic_checks(); 157 158 159 // Returns the elapsed time in seconds since the vm started. 160 static double elapsedTime(); 161 162 // Returns real time in seconds since an arbitrary point 163 // in the past. 164 static bool getTimesSecs(double* process_real_time, 165 double* process_user_time, 166 double* process_system_time); 167 168 // Interface to the performance counter 169 static jlong elapsed_counter(); 170 static jlong elapsed_frequency(); 171 172 // The "virtual time" of a thread is the amount of time a thread has 173 // actually run. The first function indicates whether the OS supports 174 // this functionality for the current thread, and if so: 175 // * the second enables vtime tracking (if that is required). 176 // * the third tells whether vtime is enabled. 177 // * the fourth returns the elapsed virtual time for the current 178 // thread. 179 static bool supports_vtime(); 180 static bool enable_vtime(); 181 static bool vtime_enabled(); 182 static double elapsedVTime(); 183 184 // Return current local time in a string (YYYY-MM-DD HH:MM:SS). 185 // It is MT safe, but not async-safe, as reading time zone 186 // information may require a lock on some platforms. 187 static char* local_time_string(char *buf, size_t buflen); 188 static struct tm* localtime_pd (const time_t* clock, struct tm* res); 189 // Fill in buffer with current local time as an ISO-8601 string. 190 // E.g., YYYY-MM-DDThh:mm:ss.mmm+zzzz. 191 // Returns buffer, or NULL if it failed. 192 static char* iso8601_time(char* buffer, size_t buffer_length); 193 194 // Interface for detecting multiprocessor system 195 static inline bool is_MP() { 196 assert(_processor_count > 0, "invalid processor count"); 197 return _processor_count > 1 || AssumeMP; 198 } 199 static julong available_memory(); 200 static julong physical_memory(); 201 static bool has_allocatable_memory_limit(julong* limit); 202 static bool is_server_class_machine(); 203 204 // number of CPUs 205 static int processor_count() { 206 return _processor_count; 207 } 208 static void set_processor_count(int count) { _processor_count = count; } 209 210 // Returns the number of CPUs this process is currently allowed to run on. 211 // Note that on some OSes this can change dynamically. 212 static int active_processor_count(); 213 214 // Bind processes to processors. 215 // This is a two step procedure: 216 // first you generate a distribution of processes to processors, 217 // then you bind processes according to that distribution. 218 // Compute a distribution for number of processes to processors. 219 // Stores the processor id's into the distribution array argument. 220 // Returns true if it worked, false if it didn't. 221 static bool distribute_processes(uint length, uint* distribution); 222 // Binds the current process to a processor. 223 // Returns true if it worked, false if it didn't. 224 static bool bind_to_processor(uint processor_id); 225 226 // Give a name to the current thread. 227 static void set_native_thread_name(const char *name); 228 229 // Interface for stack banging (predetect possible stack overflow for 230 // exception processing) There are guard pages, and above that shadow 231 // pages for stack overflow checking. 232 static bool uses_stack_guard_pages(); 233 static bool allocate_stack_guard_pages(); 234 static void bang_stack_shadow_pages(); 235 static bool stack_shadow_pages_available(Thread *thread, methodHandle method); 236 237 // OS interface to Virtual Memory 238 239 // Return the default page size. 240 static int vm_page_size(); 241 242 // Return the page size to use for a region of memory. The min_pages argument 243 // is a hint intended to limit fragmentation; it says the returned page size 244 // should be <= region_max_size / min_pages. Because min_pages is a hint, 245 // this routine may return a size larger than region_max_size / min_pages. 246 // 247 // The current implementation ignores min_pages if a larger page size is an 248 // exact multiple of both region_min_size and region_max_size. This allows 249 // larger pages to be used when doing so would not cause fragmentation; in 250 // particular, a single page can be used when region_min_size == 251 // region_max_size == a supported page size. 252 static size_t page_size_for_region(size_t region_min_size, 253 size_t region_max_size, 254 uint min_pages); 255 256 // Methods for tracing page sizes returned by the above method; enabled by 257 // TracePageSizes. The region_{min,max}_size parameters should be the values 258 // passed to page_size_for_region() and page_size should be the result of that 259 // call. The (optional) base and size parameters should come from the 260 // ReservedSpace base() and size() methods. 261 static void trace_page_sizes(const char* str, const size_t* page_sizes, 262 int count) PRODUCT_RETURN; 263 static void trace_page_sizes(const char* str, const size_t region_min_size, 264 const size_t region_max_size, 265 const size_t page_size, 266 const char* base = NULL, 267 const size_t size = 0) PRODUCT_RETURN; 268 269 static int vm_allocation_granularity(); 270 static char* reserve_memory(size_t bytes, char* addr = 0, 271 size_t alignment_hint = 0); 272 static char* reserve_memory(size_t bytes, char* addr, 273 size_t alignment_hint, MEMFLAGS flags); 274 static char* reserve_memory_aligned(size_t size, size_t alignment); 275 static char* attempt_reserve_memory_at(size_t bytes, char* addr); 276 static void split_reserved_memory(char *base, size_t size, 277 size_t split, bool realloc); 278 static bool commit_memory(char* addr, size_t bytes, bool executable); 279 static bool commit_memory(char* addr, size_t size, size_t alignment_hint, 280 bool executable); 281 // Same as commit_memory() that either succeeds or calls 282 // vm_exit_out_of_memory() with the specified mesg. 283 static void commit_memory_or_exit(char* addr, size_t bytes, 284 bool executable, const char* mesg); 285 static void commit_memory_or_exit(char* addr, size_t size, 286 size_t alignment_hint, 287 bool executable, const char* mesg); 288 static bool uncommit_memory(char* addr, size_t bytes); 289 static bool release_memory(char* addr, size_t bytes); 290 291 enum ProtType { MEM_PROT_NONE, MEM_PROT_READ, MEM_PROT_RW, MEM_PROT_RWX }; 292 static bool protect_memory(char* addr, size_t bytes, ProtType prot, 293 bool is_committed = true); 294 295 static bool guard_memory(char* addr, size_t bytes); 296 static bool unguard_memory(char* addr, size_t bytes); 297 static bool create_stack_guard_pages(char* addr, size_t bytes); 298 static bool pd_create_stack_guard_pages(char* addr, size_t bytes); 299 static bool remove_stack_guard_pages(char* addr, size_t bytes); 300 301 static char* map_memory(int fd, const char* file_name, size_t file_offset, 302 char *addr, size_t bytes, bool read_only = false, 303 bool allow_exec = false); 304 static char* remap_memory(int fd, const char* file_name, size_t file_offset, 305 char *addr, size_t bytes, bool read_only, 306 bool allow_exec); 307 static bool unmap_memory(char *addr, size_t bytes); 308 static void free_memory(char *addr, size_t bytes, size_t alignment_hint); 309 static void realign_memory(char *addr, size_t bytes, size_t alignment_hint); 310 311 // NUMA-specific interface 312 static bool numa_has_static_binding(); 313 static bool numa_has_group_homing(); 314 static void numa_make_local(char *addr, size_t bytes, int lgrp_hint); 315 static void numa_make_global(char *addr, size_t bytes); 316 static size_t numa_get_groups_num(); 317 static size_t numa_get_leaf_groups(int *ids, size_t size); 318 static bool numa_topology_changed(); 319 static int numa_get_group_id(); 320 321 // Page manipulation 322 struct page_info { 323 size_t size; 324 int lgrp_id; 325 }; 326 static bool get_page_info(char *start, page_info* info); 327 static char* scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found); 328 329 static char* non_memory_address_word(); 330 // reserve, commit and pin the entire memory region 331 static char* reserve_memory_special(size_t size, size_t alignment, 332 char* addr, bool executable); 333 static bool release_memory_special(char* addr, size_t bytes); 334 static void large_page_init(); 335 static size_t large_page_size(); 336 static bool can_commit_large_page_memory(); 337 static bool can_execute_large_page_memory(); 338 339 // OS interface to polling page 340 static address get_polling_page() { return _polling_page; } 341 static void set_polling_page(address page) { _polling_page = page; } 342 static bool is_poll_address(address addr) { return addr >= _polling_page && addr < (_polling_page + os::vm_page_size()); } 343 static void make_polling_page_unreadable(); 344 static void make_polling_page_readable(); 345 346 // Routines used to serialize the thread state without using membars 347 static void serialize_thread_states(); 348 349 // Since we write to the serialize page from every thread, we 350 // want stores to be on unique cache lines whenever possible 351 // in order to minimize CPU cross talk. We pre-compute the 352 // amount to shift the thread* to make this offset unique to 353 // each thread. 354 static int get_serialize_page_shift_count() { 355 return SerializePageShiftCount; 356 } 357 358 static void set_serialize_page_mask(uintptr_t mask) { 359 _serialize_page_mask = mask; 360 } 361 362 static unsigned int get_serialize_page_mask() { 363 return _serialize_page_mask; 364 } 365 366 static void set_memory_serialize_page(address page); 367 368 static address get_memory_serialize_page() { 369 return (address)_mem_serialize_page; 370 } 371 372 static inline void write_memory_serialize_page(JavaThread *thread) { 373 uintptr_t page_offset = ((uintptr_t)thread >> 374 get_serialize_page_shift_count()) & 375 get_serialize_page_mask(); 376 *(volatile int32_t *)((uintptr_t)_mem_serialize_page+page_offset) = 1; 377 } 378 379 static bool is_memory_serialize_page(JavaThread *thread, address addr) { 380 if (UseMembar) return false; 381 // Previously this function calculated the exact address of this 382 // thread's serialize page, and checked if the faulting address 383 // was equal. However, some platforms mask off faulting addresses 384 // to the page size, so now we just check that the address is 385 // within the page. This makes the thread argument unnecessary, 386 // but we retain the NULL check to preserve existing behaviour. 387 if (thread == NULL) return false; 388 address page = (address) _mem_serialize_page; 389 return addr >= page && addr < (page + os::vm_page_size()); 390 } 391 392 static void block_on_serialize_page_trap(); 393 394 // threads 395 396 enum ThreadType { 397 vm_thread, 398 cgc_thread, // Concurrent GC thread 399 pgc_thread, // Parallel GC thread 400 java_thread, 401 compiler_thread, 402 watcher_thread, 403 os_thread 404 }; 405 406 static bool create_thread(Thread* thread, 407 ThreadType thr_type, 408 size_t stack_size = 0); 409 static bool create_main_thread(JavaThread* thread); 410 static bool create_attached_thread(JavaThread* thread); 411 static void pd_start_thread(Thread* thread); 412 static void start_thread(Thread* thread); 413 414 static void initialize_thread(Thread* thr); 415 static void free_thread(OSThread* osthread); 416 417 // thread id on Linux/64bit is 64bit, on Windows and Solaris, it's 32bit 418 static intx current_thread_id(); 419 static int current_process_id(); 420 static int sleep(Thread* thread, jlong ms, bool interruptable); 421 static int naked_sleep(); 422 static void infinite_sleep(); // never returns, use with CAUTION 423 static void yield(); // Yields to all threads with same priority 424 enum YieldResult { 425 YIELD_SWITCHED = 1, // caller descheduled, other ready threads exist & ran 426 YIELD_NONEREADY = 0, // No other runnable/ready threads. 427 // platform-specific yield return immediately 428 YIELD_UNKNOWN = -1 // Unknown: platform doesn't support _SWITCHED or _NONEREADY 429 // YIELD_SWITCHED and YIELD_NONREADY imply the platform supports a "strong" 430 // yield that can be used in lieu of blocking. 431 } ; 432 static YieldResult NakedYield () ; 433 static void yield_all(int attempts = 0); // Yields to all other threads including lower priority 434 static void loop_breaker(int attempts); // called from within tight loops to possibly influence time-sharing 435 static OSReturn set_priority(Thread* thread, ThreadPriority priority); 436 static OSReturn get_priority(const Thread* const thread, ThreadPriority& priority); 437 438 static void interrupt(Thread* thread); 439 static bool is_interrupted(Thread* thread, bool clear_interrupted); 440 441 static int pd_self_suspend_thread(Thread* thread); 442 443 static ExtendedPC fetch_frame_from_context(void* ucVoid, intptr_t** sp, intptr_t** fp); 444 static frame fetch_frame_from_context(void* ucVoid); 445 446 static ExtendedPC get_thread_pc(Thread *thread); 447 static void breakpoint(); 448 449 static address current_stack_pointer(); 450 static address current_stack_base(); 451 static size_t current_stack_size(); 452 453 static void verify_stack_alignment() PRODUCT_RETURN; 454 455 static int message_box(const char* title, const char* message); 456 static char* do_you_want_to_debug(const char* message); 457 458 // run cmd in a separate process and return its exit code; or -1 on failures 459 static int fork_and_exec(char *cmd); 460 461 // Set file to send error reports. 462 static void set_error_file(const char *logfile); 463 464 // os::exit() is merged with vm_exit() 465 // static void exit(int num); 466 467 // Terminate the VM, but don't exit the process 468 static void shutdown(); 469 470 // Terminate with an error. Default is to generate a core file on platforms 471 // that support such things. This calls shutdown() and then aborts. 472 static void abort(bool dump_core = true); 473 474 // Die immediately, no exit hook, no abort hook, no cleanup. 475 static void die(); 476 477 // File i/o operations 478 static const int default_file_open_flags(); 479 static int open(const char *path, int oflag, int mode); 480 static FILE* open(int fd, const char* mode); 481 static int close(int fd); 482 static jlong lseek(int fd, jlong offset, int whence); 483 static char* native_path(char *path); 484 static int ftruncate(int fd, jlong length); 485 static int fsync(int fd); 486 static int available(int fd, jlong *bytes); 487 488 //File i/o operations 489 490 static size_t read(int fd, void *buf, unsigned int nBytes); 491 static size_t restartable_read(int fd, void *buf, unsigned int nBytes); 492 static size_t write(int fd, const void *buf, unsigned int nBytes); 493 494 // Reading directories. 495 static DIR* opendir(const char* dirname); 496 static int readdir_buf_size(const char *path); 497 static struct dirent* readdir(DIR* dirp, dirent* dbuf); 498 static int closedir(DIR* dirp); 499 500 // Dynamic library extension 501 static const char* dll_file_extension(); 502 503 static const char* get_temp_directory(); 504 static const char* get_current_directory(char *buf, size_t buflen); 505 506 // Builds a platform-specific full library path given a ld path and lib name 507 // Returns true if buffer contains full path to existing file, false otherwise 508 static bool dll_build_name(char* buffer, size_t size, 509 const char* pathname, const char* fname); 510 511 // Symbol lookup, find nearest function name; basically it implements 512 // dladdr() for all platforms. Name of the nearest function is copied 513 // to buf. Distance from its base address is optionally returned as offset. 514 // If function name is not found, buf[0] is set to '\0' and offset is 515 // set to -1 (if offset is non-NULL). 516 static bool dll_address_to_function_name(address addr, char* buf, 517 int buflen, int* offset); 518 519 // Locate DLL/DSO. On success, full path of the library is copied to 520 // buf, and offset is optionally set to be the distance between addr 521 // and the library's base address. On failure, buf[0] is set to '\0' 522 // and offset is set to -1 (if offset is non-NULL). 523 static bool dll_address_to_library_name(address addr, char* buf, 524 int buflen, int* offset); 525 526 // Find out whether the pc is in the static code for jvm.dll/libjvm.so. 527 static bool address_is_in_vm(address addr); 528 529 // Loads .dll/.so and 530 // in case of error it checks if .dll/.so was built for the 531 // same architecture as Hotspot is running on 532 static void* dll_load(const char *name, char *ebuf, int ebuflen); 533 534 // lookup symbol in a shared library 535 static void* dll_lookup(void* handle, const char* name); 536 537 // Unload library 538 static void dll_unload(void *lib); 539 540 // Print out system information; they are called by fatal error handler. 541 // Output format may be different on different platforms. 542 static void print_os_info(outputStream* st); 543 static void print_os_info_brief(outputStream* st); 544 static void print_cpu_info(outputStream* st); 545 static void pd_print_cpu_info(outputStream* st); 546 static void print_memory_info(outputStream* st); 547 static void print_dll_info(outputStream* st); 548 static void print_environment_variables(outputStream* st, const char** env_list, char* buffer, int len); 549 static void print_context(outputStream* st, void* context); 550 static void print_register_info(outputStream* st, void* context); 551 static void print_siginfo(outputStream* st, void* siginfo); 552 static void print_signal_handlers(outputStream* st, char* buf, size_t buflen); 553 static void print_date_and_time(outputStream* st); 554 555 static void print_location(outputStream* st, intptr_t x, bool verbose = false); 556 static size_t lasterror(char *buf, size_t len); 557 static int get_last_error(); 558 559 // Determines whether the calling process is being debugged by a user-mode debugger. 560 static bool is_debugger_attached(); 561 562 // wait for a key press if PauseAtExit is set 563 static void wait_for_keypress_at_exit(void); 564 565 // The following two functions are used by fatal error handler to trace 566 // native (C) frames. They are not part of frame.hpp/frame.cpp because 567 // frame.hpp/cpp assume thread is JavaThread, and also because different 568 // OS/compiler may have different convention or provide different API to 569 // walk C frames. 570 // 571 // We don't attempt to become a debugger, so we only follow frames if that 572 // does not require a lookup in the unwind table, which is part of the binary 573 // file but may be unsafe to read after a fatal error. So on x86, we can 574 // only walk stack if %ebp is used as frame pointer; on ia64, it's not 575 // possible to walk C stack without having the unwind table. 576 static bool is_first_C_frame(frame *fr); 577 static frame get_sender_for_C_frame(frame *fr); 578 579 // return current frame. pc() and sp() are set to NULL on failure. 580 static frame current_frame(); 581 582 static void print_hex_dump(outputStream* st, address start, address end, int unitsize); 583 584 // returns a string to describe the exception/signal; 585 // returns NULL if exception_code is not an OS exception/signal. 586 static const char* exception_name(int exception_code, char* buf, size_t buflen); 587 588 // Returns native Java library, loads if necessary 589 static void* native_java_library(); 590 591 // Fills in path to jvm.dll/libjvm.so (used by the Disassembler) 592 static void jvm_path(char *buf, jint buflen); 593 594 // Returns true if we are running in a headless jre. 595 static bool is_headless_jre(); 596 597 // JNI names 598 static void print_jni_name_prefix_on(outputStream* st, int args_size); 599 static void print_jni_name_suffix_on(outputStream* st, int args_size); 600 601 // File conventions 602 static const char* file_separator(); 603 static const char* line_separator(); 604 static const char* path_separator(); 605 606 // Init os specific system properties values 607 static void init_system_properties_values(); 608 609 // IO operations, non-JVM_ version. 610 static int stat(const char* path, struct stat* sbuf); 611 static bool dir_is_empty(const char* path); 612 613 // IO operations on binary files 614 static int create_binary_file(const char* path, bool rewrite_existing); 615 static jlong current_file_offset(int fd); 616 static jlong seek_to_file_offset(int fd, jlong offset); 617 618 // Thread Local Storage 619 static int allocate_thread_local_storage(); 620 static void thread_local_storage_at_put(int index, void* value); 621 static void* thread_local_storage_at(int index); 622 static void free_thread_local_storage(int index); 623 624 // Stack walk 625 static address get_caller_pc(int n = 0); 626 627 // General allocation (must be MT-safe) 628 static void* malloc (size_t size, MEMFLAGS flags, address caller_pc = 0); 629 static void* realloc (void *memblock, size_t size, MEMFLAGS flags, address caller_pc = 0); 630 static void free (void *memblock, MEMFLAGS flags = mtNone); 631 static bool check_heap(bool force = false); // verify C heap integrity 632 static char* strdup(const char *, MEMFLAGS flags = mtInternal); // Like strdup 633 634 #ifndef PRODUCT 635 static julong num_mallocs; // # of calls to malloc/realloc 636 static julong alloc_bytes; // # of bytes allocated 637 static julong num_frees; // # of calls to free 638 static julong free_bytes; // # of bytes freed 639 #endif 640 641 // SocketInterface (ex HPI SocketInterface ) 642 static int socket(int domain, int type, int protocol); 643 static int socket_close(int fd); 644 static int socket_shutdown(int fd, int howto); 645 static int recv(int fd, char* buf, size_t nBytes, uint flags); 646 static int send(int fd, char* buf, size_t nBytes, uint flags); 647 static int raw_send(int fd, char* buf, size_t nBytes, uint flags); 648 static int timeout(int fd, long timeout); 649 static int listen(int fd, int count); 650 static int connect(int fd, struct sockaddr* him, socklen_t len); 651 static int bind(int fd, struct sockaddr* him, socklen_t len); 652 static int accept(int fd, struct sockaddr* him, socklen_t* len); 653 static int recvfrom(int fd, char* buf, size_t nbytes, uint flags, 654 struct sockaddr* from, socklen_t* fromlen); 655 static int get_sock_name(int fd, struct sockaddr* him, socklen_t* len); 656 static int sendto(int fd, char* buf, size_t len, uint flags, 657 struct sockaddr* to, socklen_t tolen); 658 static int socket_available(int fd, jint* pbytes); 659 660 static int get_sock_opt(int fd, int level, int optname, 661 char* optval, socklen_t* optlen); 662 static int set_sock_opt(int fd, int level, int optname, 663 const char* optval, socklen_t optlen); 664 static int get_host_name(char* name, int namelen); 665 666 static struct hostent* get_host_by_name(char* name); 667 668 // Support for signals (see JVM_RaiseSignal, JVM_RegisterSignal) 669 static void signal_init(); 670 static void signal_init_pd(); 671 static void signal_notify(int signal_number); 672 static void* signal(int signal_number, void* handler); 673 static void signal_raise(int signal_number); 674 static int signal_wait(); 675 static int signal_lookup(); 676 static void* user_handler(); 677 static void terminate_signal_thread(); 678 static int sigexitnum_pd(); 679 680 // random number generation 681 static long random(); // return 32bit pseudorandom number 682 static void init_random(long initval); // initialize random sequence 683 684 // Structured OS Exception support 685 static void os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread); 686 687 // On Windows this will create an actual minidump, on Linux/Solaris it will simply check core dump limits 688 static void check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize); 689 690 // Get the default path to the core file 691 // Returns the length of the string 692 static int get_core_path(char* buffer, size_t bufferSize); 693 694 // JVMTI & JVM monitoring and management support 695 // The thread_cpu_time() and current_thread_cpu_time() are only 696 // supported if is_thread_cpu_time_supported() returns true. 697 // They are not supported on Solaris T1. 698 699 // Thread CPU Time - return the fast estimate on a platform 700 // On Solaris - call gethrvtime (fast) - user time only 701 // On Linux - fast clock_gettime where available - user+sys 702 // - otherwise: very slow /proc fs - user+sys 703 // On Windows - GetThreadTimes - user+sys 704 static jlong current_thread_cpu_time(); 705 static jlong thread_cpu_time(Thread* t); 706 707 // Thread CPU Time with user_sys_cpu_time parameter. 708 // 709 // If user_sys_cpu_time is true, user+sys time is returned. 710 // Otherwise, only user time is returned 711 static jlong current_thread_cpu_time(bool user_sys_cpu_time); 712 static jlong thread_cpu_time(Thread* t, bool user_sys_cpu_time); 713 714 // Return a bunch of info about the timers. 715 // Note that the returned info for these two functions may be different 716 // on some platforms 717 static void current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr); 718 static void thread_cpu_time_info(jvmtiTimerInfo *info_ptr); 719 720 static bool is_thread_cpu_time_supported(); 721 722 // System loadavg support. Returns -1 if load average cannot be obtained. 723 static int loadavg(double loadavg[], int nelem); 724 725 // Hook for os specific jvm options that we don't want to abort on seeing 726 static bool obsolete_option(const JavaVMOption *option); 727 728 // Read file line by line. If line is longer than bsize, 729 // rest of line is skipped. Returns number of bytes read or -1 on EOF 730 static int get_line_chars(int fd, char *buf, const size_t bsize); 731 732 // Extensions 733 #include "runtime/os_ext.hpp" 734 735 public: 736 class CrashProtectionCallback : public StackObj { 737 public: 738 virtual void call() = 0; 739 }; 740 741 // Platform dependent stuff 742 #ifdef TARGET_OS_FAMILY_linux 743 # include "os_linux.hpp" 744 # include "os_posix.hpp" 745 #endif 746 #ifdef TARGET_OS_FAMILY_solaris 747 # include "os_solaris.hpp" 748 # include "os_posix.hpp" 749 #endif 750 #ifdef TARGET_OS_FAMILY_windows 751 # include "os_windows.hpp" 752 #endif 753 #ifdef TARGET_OS_FAMILY_bsd 754 # include "os_posix.hpp" 755 # include "os_bsd.hpp" 756 #endif 757 #ifdef TARGET_OS_ARCH_linux_x86 758 # include "os_linux_x86.hpp" 759 #endif 760 #ifdef TARGET_OS_ARCH_linux_sparc 761 # include "os_linux_sparc.hpp" 762 #endif 763 #ifdef TARGET_OS_ARCH_linux_zero 764 # include "os_linux_zero.hpp" 765 #endif 766 #ifdef TARGET_OS_ARCH_solaris_x86 767 # include "os_solaris_x86.hpp" 768 #endif 769 #ifdef TARGET_OS_ARCH_solaris_sparc 770 # include "os_solaris_sparc.hpp" 771 #endif 772 #ifdef TARGET_OS_ARCH_windows_x86 773 # include "os_windows_x86.hpp" 774 #endif 775 #ifdef TARGET_OS_ARCH_linux_arm 776 # include "os_linux_arm.hpp" 777 #endif 778 #ifdef TARGET_OS_ARCH_linux_ppc 779 # include "os_linux_ppc.hpp" 780 #endif 781 #ifdef TARGET_OS_ARCH_bsd_x86 782 # include "os_bsd_x86.hpp" 783 #endif 784 #ifdef TARGET_OS_ARCH_bsd_zero 785 # include "os_bsd_zero.hpp" 786 #endif 787 788 public: 789 // debugging support (mostly used by debug.cpp but also fatal error handler) 790 static bool find(address pc, outputStream* st = tty); // OS specific function to make sense out of an address 791 792 static bool dont_yield(); // when true, JVM_Yield() is nop 793 static void print_statistics(); 794 795 // Thread priority helpers (implemented in OS-specific part) 796 static OSReturn set_native_priority(Thread* thread, int native_prio); 797 static OSReturn get_native_priority(const Thread* const thread, int* priority_ptr); 798 static int java_to_os_priority[CriticalPriority + 1]; 799 // Hint to the underlying OS that a task switch would not be good. 800 // Void return because it's a hint and can fail. 801 static void hint_no_preempt(); 802 803 // Used at creation if requested by the diagnostic flag PauseAtStartup. 804 // Causes the VM to wait until an external stimulus has been applied 805 // (for Unix, that stimulus is a signal, for Windows, an external 806 // ResumeThread call) 807 static void pause(); 808 809 class SuspendedThreadTaskContext { 810 public: 811 SuspendedThreadTaskContext(Thread* thread, void *ucontext) : _thread(thread), _ucontext(ucontext) {} 812 Thread* thread() const { return _thread; } 813 void* ucontext() const { return _ucontext; } 814 private: 815 Thread* _thread; 816 void* _ucontext; 817 }; 818 819 class SuspendedThreadTask { 820 public: 821 SuspendedThreadTask(Thread* thread) : _thread(thread), _done(false) {} 822 virtual ~SuspendedThreadTask() {} 823 void run(); 824 bool is_done() { return _done; } 825 virtual void do_task(const SuspendedThreadTaskContext& context) = 0; 826 protected: 827 private: 828 void internal_do_task(); 829 Thread* _thread; 830 bool _done; 831 }; 832 833 #ifndef TARGET_OS_FAMILY_windows 834 // Suspend/resume support 835 // Protocol: 836 // 837 // a thread starts in SR_RUNNING 838 // 839 // SR_RUNNING can go to 840 // * SR_SUSPEND_REQUEST when the WatcherThread wants to suspend it 841 // SR_SUSPEND_REQUEST can go to 842 // * SR_RUNNING if WatcherThread decides it waited for SR_SUSPENDED too long (timeout) 843 // * SR_SUSPENDED if the stopped thread receives the signal and switches state 844 // SR_SUSPENDED can go to 845 // * SR_WAKEUP_REQUEST when the WatcherThread has done the work and wants to resume 846 // SR_WAKEUP_REQUEST can go to 847 // * SR_RUNNING when the stopped thread receives the signal 848 // * SR_WAKEUP_REQUEST on timeout (resend the signal and try again) 849 class SuspendResume { 850 public: 851 enum State { 852 SR_RUNNING, 853 SR_SUSPEND_REQUEST, 854 SR_SUSPENDED, 855 SR_WAKEUP_REQUEST 856 }; 857 858 private: 859 volatile State _state; 860 861 private: 862 /* try to switch state from state "from" to state "to" 863 * returns the state set after the method is complete 864 */ 865 State switch_state(State from, State to); 866 867 public: 868 SuspendResume() : _state(SR_RUNNING) { } 869 870 State state() const { return _state; } 871 872 State request_suspend() { 873 return switch_state(SR_RUNNING, SR_SUSPEND_REQUEST); 874 } 875 876 State cancel_suspend() { 877 return switch_state(SR_SUSPEND_REQUEST, SR_RUNNING); 878 } 879 880 State suspended() { 881 return switch_state(SR_SUSPEND_REQUEST, SR_SUSPENDED); 882 } 883 884 State request_wakeup() { 885 return switch_state(SR_SUSPENDED, SR_WAKEUP_REQUEST); 886 } 887 888 State running() { 889 return switch_state(SR_WAKEUP_REQUEST, SR_RUNNING); 890 } 891 892 bool is_running() const { 893 return _state == SR_RUNNING; 894 } 895 896 bool is_suspend_request() const { 897 return _state == SR_SUSPEND_REQUEST; 898 } 899 900 bool is_suspended() const { 901 return _state == SR_SUSPENDED; 902 } 903 }; 904 #endif 905 906 907 protected: 908 static long _rand_seed; // seed for random number generator 909 static int _processor_count; // number of processors 910 911 static char* format_boot_path(const char* format_string, 912 const char* home, 913 int home_len, 914 char fileSep, 915 char pathSep); 916 static bool set_boot_path(char fileSep, char pathSep); 917 static char** split_path(const char* path, int* n); 918 919 }; 920 921 // Note that "PAUSE" is almost always used with synchronization 922 // so arguably we should provide Atomic::SpinPause() instead 923 // of the global SpinPause() with C linkage. 924 // It'd also be eligible for inlining on many platforms. 925 926 extern "C" int SpinPause(); 927 928 #endif // SHARE_VM_RUNTIME_OS_HPP