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comparison: src/share/vm/runtime/os.hpp

src/share/vm/runtime/os.hpp

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1 /*
2 * Copyright 1997-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 // os defines the interface to operating system; this includes traditional
26 // OS services (time, I/O) as well as other functionality with system-
27 // dependent code.
28
29 typedef void (*dll_func)(...);
30
31 class Thread;
32 class JavaThread;
33 class Event;
34 class DLL;
35 class FileHandle;
36
37 // %%%%% Moved ThreadState, START_FN, OSThread to new osThread.hpp. -- Rose
38
39 // Platform-independent error return values from OS functions
40 enum OSReturn {
41 OS_OK = 0, // Operation was successful
42 OS_ERR = -1, // Operation failed
43 OS_INTRPT = -2, // Operation was interrupted
44 OS_TIMEOUT = -3, // Operation timed out
45 OS_NOMEM = -5, // Operation failed for lack of memory
46 OS_NORESOURCE = -6 // Operation failed for lack of nonmemory resource
47 };
48
49 enum ThreadPriority { // JLS 20.20.1-3
50 NoPriority = -1, // Initial non-priority value
51 MinPriority = 1, // Minimum priority
52 NormPriority = 5, // Normal (non-daemon) priority
53 NearMaxPriority = 9, // High priority, used for VMThread
54 MaxPriority = 10 // Highest priority, used for WatcherThread
55 // ensures that VMThread doesn't starve profiler
56 };
57
58 // Typedef for structured exception handling support
59 typedef void (*java_call_t)(JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread);
60
61 class os: AllStatic {
62 private:
63 enum { page_sizes_max = 9 }; // Size of _page_sizes array (8 plus a sentinel)
64
65 static OSThread* _starting_thread;
66 static address _polling_page;
67 static volatile int32_t * _mem_serialize_page;
68 static uintptr_t _serialize_page_mask;
69 static volatile jlong _global_time;
70 static volatile int _global_time_lock;
71 static bool _use_global_time;
72 static size_t _page_sizes[page_sizes_max];
73
74 static void init_page_sizes(size_t default_page_size) {
75 _page_sizes[0] = default_page_size;
76 _page_sizes[1] = 0; // sentinel
77 }
78
79 public:
80
81 static void init(void); // Called before command line parsing
82 static jint init_2(void); // Called after command line parsing
83
84 // File names are case-insensitive on windows only
85 // Override me as needed
86 static int file_name_strcmp(const char* s1, const char* s2);
87
88 static bool getenv(const char* name, char* buffer, int len);
89 static bool have_special_privileges();
90
91 static jlong timeofday();
92 static void enable_global_time() { _use_global_time = true; }
93 static void disable_global_time() { _use_global_time = false; }
94 static jlong read_global_time();
95 static void update_global_time();
96 static jlong javaTimeMillis();
97 static jlong javaTimeNanos();
98 static void javaTimeNanos_info(jvmtiTimerInfo *info_ptr);
99 static void run_periodic_checks();
100
101
102 // Returns the elapsed time in seconds since the vm started.
103 static double elapsedTime();
104
105 // Returns real time in seconds since an arbitrary point
106 // in the past.
107 static bool getTimesSecs(double* process_real_time,
108 double* process_user_time,
109 double* process_system_time);
110
111 // Interface to the performance counter
112 static jlong elapsed_counter();
113 static jlong elapsed_frequency();
114
115 // Return current local time in a string (YYYY-MM-DD HH:MM:SS).
116 // It is MT safe, but not async-safe, as reading time zone
117 // information may require a lock on some platforms.
118 static char* local_time_string(char *buf, size_t buflen);
119 // Fill in buffer with current local time as an ISO-8601 string.
120 // E.g., YYYY-MM-DDThh:mm:ss.mmm+zzzz.
121 // Returns buffer, or NULL if it failed.
122 static char* iso8601_time(char* buffer, size_t buffer_length);
123
124 // Interface for detecting multiprocessor system
125 static inline bool is_MP() {
126 assert(_processor_count > 0, "invalid processor count");
127 return _processor_count > 1;
128 }
129 static julong available_memory();
130 static julong physical_memory();
131 static julong allocatable_physical_memory(julong size);
132 static bool is_server_class_machine();
133
134 // number of CPUs
135 static int processor_count() {
136 return _processor_count;
137 }
138
139 // Returns the number of CPUs this process is currently allowed to run on.
140 // Note that on some OSes this can change dynamically.
141 static int active_processor_count();
142
143 // Bind processes to processors.
144 // This is a two step procedure:
145 // first you generate a distribution of processes to processors,
146 // then you bind processes according to that distribution.
147 // Compute a distribution for number of processes to processors.
148 // Stores the processor id's into the distribution array argument.
149 // Returns true if it worked, false if it didn't.
150 static bool distribute_processes(uint length, uint* distribution);
151 // Binds the current process to a processor.
152 // Returns true if it worked, false if it didn't.
153 static bool bind_to_processor(uint processor_id);
154
155 // Interface for stack banging (predetect possible stack overflow for
156 // exception processing) There are guard pages, and above that shadow
157 // pages for stack overflow checking.
158 static bool uses_stack_guard_pages();
159 static bool allocate_stack_guard_pages();
160 static void bang_stack_shadow_pages();
161 static bool stack_shadow_pages_available(Thread *thread, methodHandle method);
162
163 // OS interface to Virtual Memory
164
165 // Return the default page size.
166 static int vm_page_size();
167
168 // Return the page size to use for a region of memory. The min_pages argument
169 // is a hint intended to limit fragmentation; it says the returned page size
170 // should be <= region_max_size / min_pages. Because min_pages is a hint,
171 // this routine may return a size larger than region_max_size / min_pages.
172 //
173 // The current implementation ignores min_pages if a larger page size is an
174 // exact multiple of both region_min_size and region_max_size. This allows
175 // larger pages to be used when doing so would not cause fragmentation; in
176 // particular, a single page can be used when region_min_size ==
177 // region_max_size == a supported page size.
178 static size_t page_size_for_region(size_t region_min_size,
179 size_t region_max_size,
180 uint min_pages);
181
182 // Method for tracing page sizes returned by the above method; enabled by
183 // TracePageSizes. The region_{min,max}_size parameters should be the values
184 // passed to page_size_for_region() and page_size should be the result of that
185 // call. The (optional) base and size parameters should come from the
186 // ReservedSpace base() and size() methods.
187 static void trace_page_sizes(const char* str, const size_t region_min_size,
188 const size_t region_max_size,
189 const size_t page_size,
190 const char* base = NULL,
191 const size_t size = 0) PRODUCT_RETURN;
192
193 static int vm_allocation_granularity();
194 static char* reserve_memory(size_t bytes, char* addr = 0,
195 size_t alignment_hint = 0);
196 static char* attempt_reserve_memory_at(size_t bytes, char* addr);
197 static void split_reserved_memory(char *base, size_t size,
198 size_t split, bool realloc);
199 static bool commit_memory(char* addr, size_t bytes);
200 static bool commit_memory(char* addr, size_t size, size_t alignment_hint);
201 static bool uncommit_memory(char* addr, size_t bytes);
202 static bool release_memory(char* addr, size_t bytes);
203 static bool protect_memory(char* addr, size_t bytes);
204 static bool guard_memory(char* addr, size_t bytes);
205 static bool unguard_memory(char* addr, size_t bytes);
206 static char* map_memory(int fd, const char* file_name, size_t file_offset,
207 char *addr, size_t bytes, bool read_only = false,
208 bool allow_exec = false);
209 static char* remap_memory(int fd, const char* file_name, size_t file_offset,
210 char *addr, size_t bytes, bool read_only,
211 bool allow_exec);
212 static bool unmap_memory(char *addr, size_t bytes);
213 static void free_memory(char *addr, size_t bytes);
214 static void realign_memory(char *addr, size_t bytes, size_t alignment_hint);
215
216 // NUMA-specific interface
217 static void numa_make_local(char *addr, size_t bytes);
218 static void numa_make_global(char *addr, size_t bytes);
219 static size_t numa_get_groups_num();
220 static size_t numa_get_leaf_groups(int *ids, size_t size);
221 static bool numa_topology_changed();
222 static int numa_get_group_id();
223
224 // Page manipulation
225 struct page_info {
226 size_t size;
227 int lgrp_id;
228 };
229 static bool get_page_info(char *start, page_info* info);
230 static char* scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found);
231
232 static char* non_memory_address_word();
233 // reserve, commit and pin the entire memory region
234 static char* reserve_memory_special(size_t size);
235 static bool release_memory_special(char* addr, size_t bytes);
236 static bool large_page_init();
237 static size_t large_page_size();
238 static bool can_commit_large_page_memory();
239
240 // OS interface to polling page
241 static address get_polling_page() { return _polling_page; }
242 static void set_polling_page(address page) { _polling_page = page; }
243 static bool is_poll_address(address addr) { return addr >= _polling_page && addr < (_polling_page + os::vm_page_size()); }
244 static void make_polling_page_unreadable();
245 static void make_polling_page_readable();
246
247 // Routines used to serialize the thread state without using membars
248 static void serialize_thread_states();
249
250 // Since we write to the serialize page from every thread, we
251 // want stores to be on unique cache lines whenever possible
252 // in order to minimize CPU cross talk. We pre-compute the
253 // amount to shift the thread* to make this offset unique to
254 // each thread.
255 static int get_serialize_page_shift_count() {
256 return SerializePageShiftCount;
257 }
258
259 static void set_serialize_page_mask(uintptr_t mask) {
260 _serialize_page_mask = mask;
261 }
262
263 static unsigned int get_serialize_page_mask() {
264 return _serialize_page_mask;
265 }
266
267 static void set_memory_serialize_page(address page);
268
269 static address get_memory_serialize_page() {
270 return (address)_mem_serialize_page;
271 }
272
273 static inline void write_memory_serialize_page(JavaThread *thread) {
274 uintptr_t page_offset = ((uintptr_t)thread >>
275 get_serialize_page_shift_count()) &
276 get_serialize_page_mask();
277 *(volatile int32_t *)((uintptr_t)_mem_serialize_page+page_offset) = 1;
278 }
279
280 static bool is_memory_serialize_page(JavaThread *thread, address addr) {
281 address thr_addr;
282 if (UseMembar) return false;
283 // Calculate thread specific address
284 if (thread == NULL) return false;
285 // TODO-FIXME: some platforms mask off faulting addresses to the base pagesize.
286 // Instead of using a test for equality we should probably use something
287 // of the form:
288 // return ((_mem_serialize_page ^ addr) & -pagesize) == 0
289 //
290 thr_addr = (address)(((uintptr_t)thread >>
291 get_serialize_page_shift_count()) &
292 get_serialize_page_mask()) + (uintptr_t)_mem_serialize_page;
293 return (thr_addr == addr);
294 }
295
296 static void block_on_serialize_page_trap();
297
298 // threads
299
300 enum ThreadType {
301 vm_thread,
302 cgc_thread, // Concurrent GC thread
303 pgc_thread, // Parallel GC thread
304 java_thread,
305 compiler_thread,
306 watcher_thread
307 };
308
309 static bool create_thread(Thread* thread,
310 ThreadType thr_type,
311 size_t stack_size = 0);
312 static bool create_main_thread(JavaThread* thread);
313 static bool create_attached_thread(JavaThread* thread);
314 static void pd_start_thread(Thread* thread);
315 static void start_thread(Thread* thread);
316
317 static void initialize_thread();
318 static void free_thread(OSThread* osthread);
319
320 // thread id on Linux/64bit is 64bit, on Windows and Solaris, it's 32bit
321 static intx current_thread_id();
322 static int current_process_id();
323 // hpi::read for calls from non native state
324 // For performance, hpi::read is only callable from _thread_in_native
325 static size_t read(int fd, void *buf, unsigned int nBytes);
326 static int sleep(Thread* thread, jlong ms, bool interruptable);
327 static int naked_sleep();
328 static void infinite_sleep(); // never returns, use with CAUTION
329 static void yield(); // Yields to all threads with same priority
330 enum YieldResult {
331 YIELD_SWITCHED = 1, // caller descheduled, other ready threads exist & ran
332 YIELD_NONEREADY = 0, // No other runnable/ready threads.
333 // platform-specific yield return immediately
334 YIELD_UNKNOWN = -1 // Unknown: platform doesn't support _SWITCHED or _NONEREADY
335 // YIELD_SWITCHED and YIELD_NONREADY imply the platform supports a "strong"
336 // yield that can be used in lieu of blocking.
337 } ;
338 static YieldResult NakedYield () ;
339 static void yield_all(int attempts = 0); // Yields to all other threads including lower priority
340 static void loop_breaker(int attempts); // called from within tight loops to possibly influence time-sharing
341 static OSReturn set_priority(Thread* thread, ThreadPriority priority);
342 static OSReturn get_priority(const Thread* const thread, ThreadPriority& priority);
343
344 static void interrupt(Thread* thread);
345 static bool is_interrupted(Thread* thread, bool clear_interrupted);
346
347 static int pd_self_suspend_thread(Thread* thread);
348
349 static ExtendedPC fetch_frame_from_context(void* ucVoid, intptr_t** sp, intptr_t** fp);
350 static frame fetch_frame_from_context(void* ucVoid);
351
352 static ExtendedPC get_thread_pc(Thread *thread);
353 static void breakpoint();
354
355 static address current_stack_pointer();
356 static address current_stack_base();
357 static size_t current_stack_size();
358
359 static int message_box(const char* title, const char* message);
360 static char* do_you_want_to_debug(const char* message);
361
362 // run cmd in a separate process and return its exit code; or -1 on failures
363 static int fork_and_exec(char *cmd);
364
365 // Set file to send error reports.
366 static void set_error_file(const char *logfile);
367
368 // os::exit() is merged with vm_exit()
369 // static void exit(int num);
370
371 // Terminate the VM, but don't exit the process
372 static void shutdown();
373
374 // Terminate with an error. Default is to generate a core file on platforms
375 // that support such things. This calls shutdown() and then aborts.
376 static void abort(bool dump_core = true);
377
378 // Die immediately, no exit hook, no abort hook, no cleanup.
379 static void die();
380
381 // Reading directories.
382 static DIR* opendir(const char* dirname);
383 static int readdir_buf_size(const char *path);
384 static struct dirent* readdir(DIR* dirp, dirent* dbuf);
385 static int closedir(DIR* dirp);
386
387 // Dynamic library extension
388 static const char* dll_file_extension();
389
390 static const char* get_temp_directory();
391 static const char* get_current_directory(char *buf, int buflen);
392
393 // Symbol lookup, find nearest function name; basically it implements
394 // dladdr() for all platforms. Name of the nearest function is copied
395 // to buf. Distance from its base address is returned as offset.
396 // If function name is not found, buf[0] is set to '\0' and offset is
397 // set to -1.
398 static bool dll_address_to_function_name(address addr, char* buf,
399 int buflen, int* offset);
400
401 // Locate DLL/DSO. On success, full path of the library is copied to
402 // buf, and offset is set to be the distance between addr and the
403 // library's base address. On failure, buf[0] is set to '\0' and
404 // offset is set to -1.
405 static bool dll_address_to_library_name(address addr, char* buf,
406 int buflen, int* offset);
407
408 // Find out whether the pc is in the static code for jvm.dll/libjvm.so.
409 static bool address_is_in_vm(address addr);
410
411 // Loads .dll/.so and
412 // in case of error it checks if .dll/.so was built for the
413 // same architecture as Hotspot is running on
414 static void* dll_load(const char *name, char *ebuf, int ebuflen);
415
416 // Print out system information; they are called by fatal error handler.
417 // Output format may be different on different platforms.
418 static void print_os_info(outputStream* st);
419 static void print_cpu_info(outputStream* st);
420 static void print_memory_info(outputStream* st);
421 static void print_dll_info(outputStream* st);
422 static void print_environment_variables(outputStream* st, const char** env_list, char* buffer, int len);
423 static void print_context(outputStream* st, void* context);
424 static void print_siginfo(outputStream* st, void* siginfo);
425 static void print_signal_handlers(outputStream* st, char* buf, size_t buflen);
426 static void print_date_and_time(outputStream* st);
427
428 // The following two functions are used by fatal error handler to trace
429 // native (C) frames. They are not part of frame.hpp/frame.cpp because
430 // frame.hpp/cpp assume thread is JavaThread, and also because different
431 // OS/compiler may have different convention or provide different API to
432 // walk C frames.
433 //
434 // We don't attempt to become a debugger, so we only follow frames if that
435 // does not require a lookup in the unwind table, which is part of the binary
436 // file but may be unsafe to read after a fatal error. So on x86, we can
437 // only walk stack if %ebp is used as frame pointer; on ia64, it's not
438 // possible to walk C stack without having the unwind table.
439 static bool is_first_C_frame(frame *fr);
440 static frame get_sender_for_C_frame(frame *fr);
441
442 // return current frame. pc() and sp() are set to NULL on failure.
443 static frame current_frame();
444
445 static void print_hex_dump(outputStream* st, address start, address end, int unitsize);
446
447 // returns a string to describe the exception/signal;
448 // returns NULL if exception_code is not an OS exception/signal.
449 static const char* exception_name(int exception_code, char* buf, size_t buflen);
450
451 // Returns native Java library, loads if necessary
452 static void* native_java_library();
453
454 // Fills in path to jvm.dll/libjvm.so (this info used to find hpi).
455 static void jvm_path(char *buf, jint buflen);
456
457 // JNI names
458 static void print_jni_name_prefix_on(outputStream* st, int args_size);
459 static void print_jni_name_suffix_on(outputStream* st, int args_size);
460
461 // File conventions
462 static const char* file_separator();
463 static const char* line_separator();
464 static const char* path_separator();
465
466 // Init os specific system properties values
467 static void init_system_properties_values();
468
469 // IO operations, non-JVM_ version.
470 static int stat(const char* path, struct stat* sbuf);
471 static bool dir_is_empty(const char* path);
472
473 // IO operations on binary files
474 static int create_binary_file(const char* path, bool rewrite_existing);
475 static jlong current_file_offset(int fd);
476 static jlong seek_to_file_offset(int fd, jlong offset);
477
478 // Thread Local Storage
479 static int allocate_thread_local_storage();
480 static void thread_local_storage_at_put(int index, void* value);
481 static void* thread_local_storage_at(int index);
482 static void free_thread_local_storage(int index);
483
484 // General allocation (must be MT-safe)
485 static void* malloc (size_t size);
486 static void* realloc (void *memblock, size_t size);
487 static void free (void *memblock);
488 static bool check_heap(bool force = false); // verify C heap integrity
489 static char* strdup(const char *); // Like strdup
490
491 #ifndef PRODUCT
492 static int num_mallocs; // # of calls to malloc/realloc
493 static size_t alloc_bytes; // # of bytes allocated
494 static int num_frees; // # of calls to free
495 #endif
496
497 // Printing 64 bit integers
498 static const char* jlong_format_specifier();
499 static const char* julong_format_specifier();
500
501 // Support for signals (see JVM_RaiseSignal, JVM_RegisterSignal)
502 static void signal_init();
503 static void signal_init_pd();
504 static void signal_notify(int signal_number);
505 static void* signal(int signal_number, void* handler);
506 static void signal_raise(int signal_number);
507 static int signal_wait();
508 static int signal_lookup();
509 static void* user_handler();
510 static void terminate_signal_thread();
511 static int sigexitnum_pd();
512
513 // random number generation
514 static long random(); // return 32bit pseudorandom number
515 static void init_random(long initval); // initialize random sequence
516
517 // Structured OS Exception support
518 static void os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread);
519
520 // JVMTI & JVM monitoring and management support
521 // The thread_cpu_time() and current_thread_cpu_time() are only
522 // supported if is_thread_cpu_time_supported() returns true.
523 // They are not supported on Solaris T1.
524
525 // Thread CPU Time - return the fast estimate on a platform
526 // On Solaris - call gethrvtime (fast) - user time only
527 // On Linux - fast clock_gettime where available - user+sys
528 // - otherwise: very slow /proc fs - user+sys
529 // On Windows - GetThreadTimes - user+sys
530 static jlong current_thread_cpu_time();
531 static jlong thread_cpu_time(Thread* t);
532
533 // Thread CPU Time with user_sys_cpu_time parameter.
534 //
535 // If user_sys_cpu_time is true, user+sys time is returned.
536 // Otherwise, only user time is returned
537 static jlong current_thread_cpu_time(bool user_sys_cpu_time);
538 static jlong thread_cpu_time(Thread* t, bool user_sys_cpu_time);
539
540 // Return a bunch of info about the timers.
541 // Note that the returned info for these two functions may be different
542 // on some platforms
543 static void current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr);
544 static void thread_cpu_time_info(jvmtiTimerInfo *info_ptr);
545
546 static bool is_thread_cpu_time_supported();
547
548 // System loadavg support. Returns -1 if load average cannot be obtained.
549 static int loadavg(double loadavg[], int nelem);
550
551 // Hook for os specific jvm options that we don't want to abort on seeing
552 static bool obsolete_option(const JavaVMOption *option);
553
554 // Platform dependent stuff
555 #include "incls/_os_pd.hpp.incl"
556
557 // debugging support (mostly used by debug.cpp)
558 static bool find(address pc) PRODUCT_RETURN0; // OS specific function to make sense out of an address
559
560 static bool dont_yield(); // when true, JVM_Yield() is nop
561 static void print_statistics();
562
563 // Thread priority helpers (implemented in OS-specific part)
564 static OSReturn set_native_priority(Thread* thread, int native_prio);
565 static OSReturn get_native_priority(const Thread* const thread, int* priority_ptr);
566 static int java_to_os_priority[MaxPriority + 1];
567 // Hint to the underlying OS that a task switch would not be good.
568 // Void return because it's a hint and can fail.
569 static void hint_no_preempt();
570
571 // Used at creation if requested by the diagnostic flag PauseAtStartup.
572 // Causes the VM to wait until an external stimulus has been applied
573 // (for Unix, that stimulus is a signal, for Windows, an external
574 // ResumeThread call)
575 static void pause();
576
577 protected:
578 static long _rand_seed; // seed for random number generator
579 static int _processor_count; // number of processors
580
581 static char* format_boot_path(const char* format_string,
582 const char* home,
583 int home_len,
584 char fileSep,
585 char pathSep);
586 static bool set_boot_path(char fileSep, char pathSep);
587 };
588
589 // Note that "PAUSE" is almost always used with synchronization
590 // so arguably we should provide Atomic::SpinPause() instead
591 // of the global SpinPause() with C linkage.
592 // It'd also be eligible for inlining on many platforms.
593
594 extern "C" int SpinPause () ;
595 extern "C" int SafeFetch32 (int * adr, int errValue) ;
596 extern "C" intptr_t SafeFetchN (intptr_t * adr, intptr_t errValue) ;

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