Mercurial > hg > graal-jvmci-8
annotate src/share/vm/runtime/os.hpp @ 350:d28aa69f0959
6618726: Introduce -XX:+UnlockExperimentalVMOptions flag
Summary: experimental() flags will protect features of an experimental nature that are not supported in the regular product build. Made UseG1GC an experimental flag.
Reviewed-by: jmasa, kamg, coleenp
author | ysr |
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date | Mon, 30 Jun 2008 17:04:59 -0700 |
parents | 37f87013dfd8 |
children | 1ee8caae33af |
rev | line source |
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0 | 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; | |
141 | 36 template<class E> class GrowableArray; |
0 | 37 |
38 // %%%%% Moved ThreadState, START_FN, OSThread to new osThread.hpp. -- Rose | |
39 | |
40 // Platform-independent error return values from OS functions | |
41 enum OSReturn { | |
42 OS_OK = 0, // Operation was successful | |
43 OS_ERR = -1, // Operation failed | |
44 OS_INTRPT = -2, // Operation was interrupted | |
45 OS_TIMEOUT = -3, // Operation timed out | |
46 OS_NOMEM = -5, // Operation failed for lack of memory | |
47 OS_NORESOURCE = -6 // Operation failed for lack of nonmemory resource | |
48 }; | |
49 | |
50 enum ThreadPriority { // JLS 20.20.1-3 | |
51 NoPriority = -1, // Initial non-priority value | |
52 MinPriority = 1, // Minimum priority | |
53 NormPriority = 5, // Normal (non-daemon) priority | |
54 NearMaxPriority = 9, // High priority, used for VMThread | |
55 MaxPriority = 10 // Highest priority, used for WatcherThread | |
56 // ensures that VMThread doesn't starve profiler | |
57 }; | |
58 | |
59 // Typedef for structured exception handling support | |
60 typedef void (*java_call_t)(JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread); | |
61 | |
62 class os: AllStatic { | |
63 private: | |
64 enum { page_sizes_max = 9 }; // Size of _page_sizes array (8 plus a sentinel) | |
65 | |
66 static OSThread* _starting_thread; | |
67 static address _polling_page; | |
68 static volatile int32_t * _mem_serialize_page; | |
69 static uintptr_t _serialize_page_mask; | |
70 static size_t _page_sizes[page_sizes_max]; | |
71 | |
72 static void init_page_sizes(size_t default_page_size) { | |
73 _page_sizes[0] = default_page_size; | |
74 _page_sizes[1] = 0; // sentinel | |
75 } | |
76 | |
77 public: | |
78 | |
79 static void init(void); // Called before command line parsing | |
80 static jint init_2(void); // Called after command line parsing | |
81 | |
82 // File names are case-insensitive on windows only | |
83 // Override me as needed | |
84 static int file_name_strcmp(const char* s1, const char* s2); | |
85 | |
86 static bool getenv(const char* name, char* buffer, int len); | |
87 static bool have_special_privileges(); | |
88 | |
89 static jlong javaTimeMillis(); | |
90 static jlong javaTimeNanos(); | |
91 static void javaTimeNanos_info(jvmtiTimerInfo *info_ptr); | |
92 static void run_periodic_checks(); | |
93 | |
94 | |
95 // Returns the elapsed time in seconds since the vm started. | |
96 static double elapsedTime(); | |
97 | |
98 // Returns real time in seconds since an arbitrary point | |
99 // in the past. | |
100 static bool getTimesSecs(double* process_real_time, | |
101 double* process_user_time, | |
102 double* process_system_time); | |
103 | |
104 // Interface to the performance counter | |
105 static jlong elapsed_counter(); | |
106 static jlong elapsed_frequency(); | |
107 | |
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108 // The "virtual time" of a thread is the amount of time a thread has |
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109 // actually run. The first function indicates whether the OS supports |
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110 // this functionality for the current thread, and if so: |
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111 // * the second enables vtime tracking (if that is required). |
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112 // * the third tells whether vtime is enabled. |
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113 // * the fourth returns the elapsed virtual time for the current |
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114 // thread. |
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115 static bool supports_vtime(); |
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116 static bool enable_vtime(); |
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117 static bool vtime_enabled(); |
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118 static double elapsedVTime(); |
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119 |
0 | 120 // Return current local time in a string (YYYY-MM-DD HH:MM:SS). |
121 // It is MT safe, but not async-safe, as reading time zone | |
122 // information may require a lock on some platforms. | |
123 static char* local_time_string(char *buf, size_t buflen); | |
124 // Fill in buffer with current local time as an ISO-8601 string. | |
125 // E.g., YYYY-MM-DDThh:mm:ss.mmm+zzzz. | |
126 // Returns buffer, or NULL if it failed. | |
127 static char* iso8601_time(char* buffer, size_t buffer_length); | |
128 | |
129 // Interface for detecting multiprocessor system | |
130 static inline bool is_MP() { | |
131 assert(_processor_count > 0, "invalid processor count"); | |
132 return _processor_count > 1; | |
133 } | |
134 static julong available_memory(); | |
135 static julong physical_memory(); | |
136 static julong allocatable_physical_memory(julong size); | |
137 static bool is_server_class_machine(); | |
138 | |
139 // number of CPUs | |
140 static int processor_count() { | |
141 return _processor_count; | |
142 } | |
143 | |
144 // Returns the number of CPUs this process is currently allowed to run on. | |
145 // Note that on some OSes this can change dynamically. | |
146 static int active_processor_count(); | |
147 | |
148 // Bind processes to processors. | |
149 // This is a two step procedure: | |
150 // first you generate a distribution of processes to processors, | |
151 // then you bind processes according to that distribution. | |
152 // Compute a distribution for number of processes to processors. | |
153 // Stores the processor id's into the distribution array argument. | |
154 // Returns true if it worked, false if it didn't. | |
155 static bool distribute_processes(uint length, uint* distribution); | |
156 // Binds the current process to a processor. | |
157 // Returns true if it worked, false if it didn't. | |
158 static bool bind_to_processor(uint processor_id); | |
159 | |
160 // Interface for stack banging (predetect possible stack overflow for | |
161 // exception processing) There are guard pages, and above that shadow | |
162 // pages for stack overflow checking. | |
163 static bool uses_stack_guard_pages(); | |
164 static bool allocate_stack_guard_pages(); | |
165 static void bang_stack_shadow_pages(); | |
166 static bool stack_shadow_pages_available(Thread *thread, methodHandle method); | |
167 | |
168 // OS interface to Virtual Memory | |
169 | |
170 // Return the default page size. | |
171 static int vm_page_size(); | |
172 | |
173 // Return the page size to use for a region of memory. The min_pages argument | |
174 // is a hint intended to limit fragmentation; it says the returned page size | |
175 // should be <= region_max_size / min_pages. Because min_pages is a hint, | |
176 // this routine may return a size larger than region_max_size / min_pages. | |
177 // | |
178 // The current implementation ignores min_pages if a larger page size is an | |
179 // exact multiple of both region_min_size and region_max_size. This allows | |
180 // larger pages to be used when doing so would not cause fragmentation; in | |
181 // particular, a single page can be used when region_min_size == | |
182 // region_max_size == a supported page size. | |
183 static size_t page_size_for_region(size_t region_min_size, | |
184 size_t region_max_size, | |
185 uint min_pages); | |
186 | |
187 // Method for tracing page sizes returned by the above method; enabled by | |
188 // TracePageSizes. The region_{min,max}_size parameters should be the values | |
189 // passed to page_size_for_region() and page_size should be the result of that | |
190 // call. The (optional) base and size parameters should come from the | |
191 // ReservedSpace base() and size() methods. | |
192 static void trace_page_sizes(const char* str, const size_t region_min_size, | |
193 const size_t region_max_size, | |
194 const size_t page_size, | |
195 const char* base = NULL, | |
196 const size_t size = 0) PRODUCT_RETURN; | |
197 | |
198 static int vm_allocation_granularity(); | |
199 static char* reserve_memory(size_t bytes, char* addr = 0, | |
200 size_t alignment_hint = 0); | |
201 static char* attempt_reserve_memory_at(size_t bytes, char* addr); | |
202 static void split_reserved_memory(char *base, size_t size, | |
203 size_t split, bool realloc); | |
204 static bool commit_memory(char* addr, size_t bytes); | |
205 static bool commit_memory(char* addr, size_t size, size_t alignment_hint); | |
206 static bool uncommit_memory(char* addr, size_t bytes); | |
207 static bool release_memory(char* addr, size_t bytes); | |
208 static bool protect_memory(char* addr, size_t bytes); | |
209 static bool guard_memory(char* addr, size_t bytes); | |
210 static bool unguard_memory(char* addr, size_t bytes); | |
211 static char* map_memory(int fd, const char* file_name, size_t file_offset, | |
212 char *addr, size_t bytes, bool read_only = false, | |
213 bool allow_exec = false); | |
214 static char* remap_memory(int fd, const char* file_name, size_t file_offset, | |
215 char *addr, size_t bytes, bool read_only, | |
216 bool allow_exec); | |
217 static bool unmap_memory(char *addr, size_t bytes); | |
218 static void free_memory(char *addr, size_t bytes); | |
219 static void realign_memory(char *addr, size_t bytes, size_t alignment_hint); | |
220 | |
221 // NUMA-specific interface | |
141 | 222 static bool numa_has_static_binding(); |
223 static bool numa_has_group_homing(); | |
224 static void numa_make_local(char *addr, size_t bytes, int lgrp_hint); | |
0 | 225 static void numa_make_global(char *addr, size_t bytes); |
226 static size_t numa_get_groups_num(); | |
227 static size_t numa_get_leaf_groups(int *ids, size_t size); | |
228 static bool numa_topology_changed(); | |
229 static int numa_get_group_id(); | |
230 | |
231 // Page manipulation | |
232 struct page_info { | |
233 size_t size; | |
234 int lgrp_id; | |
235 }; | |
236 static bool get_page_info(char *start, page_info* info); | |
237 static char* scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found); | |
238 | |
239 static char* non_memory_address_word(); | |
240 // reserve, commit and pin the entire memory region | |
241 static char* reserve_memory_special(size_t size); | |
242 static bool release_memory_special(char* addr, size_t bytes); | |
243 static bool large_page_init(); | |
244 static size_t large_page_size(); | |
245 static bool can_commit_large_page_memory(); | |
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246 static bool can_execute_large_page_memory(); |
0 | 247 |
248 // OS interface to polling page | |
249 static address get_polling_page() { return _polling_page; } | |
250 static void set_polling_page(address page) { _polling_page = page; } | |
251 static bool is_poll_address(address addr) { return addr >= _polling_page && addr < (_polling_page + os::vm_page_size()); } | |
252 static void make_polling_page_unreadable(); | |
253 static void make_polling_page_readable(); | |
254 | |
255 // Routines used to serialize the thread state without using membars | |
256 static void serialize_thread_states(); | |
257 | |
258 // Since we write to the serialize page from every thread, we | |
259 // want stores to be on unique cache lines whenever possible | |
260 // in order to minimize CPU cross talk. We pre-compute the | |
261 // amount to shift the thread* to make this offset unique to | |
262 // each thread. | |
263 static int get_serialize_page_shift_count() { | |
264 return SerializePageShiftCount; | |
265 } | |
266 | |
267 static void set_serialize_page_mask(uintptr_t mask) { | |
268 _serialize_page_mask = mask; | |
269 } | |
270 | |
271 static unsigned int get_serialize_page_mask() { | |
272 return _serialize_page_mask; | |
273 } | |
274 | |
275 static void set_memory_serialize_page(address page); | |
276 | |
277 static address get_memory_serialize_page() { | |
278 return (address)_mem_serialize_page; | |
279 } | |
280 | |
281 static inline void write_memory_serialize_page(JavaThread *thread) { | |
282 uintptr_t page_offset = ((uintptr_t)thread >> | |
283 get_serialize_page_shift_count()) & | |
284 get_serialize_page_mask(); | |
285 *(volatile int32_t *)((uintptr_t)_mem_serialize_page+page_offset) = 1; | |
286 } | |
287 | |
288 static bool is_memory_serialize_page(JavaThread *thread, address addr) { | |
289 address thr_addr; | |
290 if (UseMembar) return false; | |
291 // Calculate thread specific address | |
292 if (thread == NULL) return false; | |
293 // TODO-FIXME: some platforms mask off faulting addresses to the base pagesize. | |
294 // Instead of using a test for equality we should probably use something | |
295 // of the form: | |
296 // return ((_mem_serialize_page ^ addr) & -pagesize) == 0 | |
297 // | |
298 thr_addr = (address)(((uintptr_t)thread >> | |
299 get_serialize_page_shift_count()) & | |
300 get_serialize_page_mask()) + (uintptr_t)_mem_serialize_page; | |
301 return (thr_addr == addr); | |
302 } | |
303 | |
304 static void block_on_serialize_page_trap(); | |
305 | |
306 // threads | |
307 | |
308 enum ThreadType { | |
309 vm_thread, | |
310 cgc_thread, // Concurrent GC thread | |
311 pgc_thread, // Parallel GC thread | |
312 java_thread, | |
313 compiler_thread, | |
314 watcher_thread | |
315 }; | |
316 | |
317 static bool create_thread(Thread* thread, | |
318 ThreadType thr_type, | |
319 size_t stack_size = 0); | |
320 static bool create_main_thread(JavaThread* thread); | |
321 static bool create_attached_thread(JavaThread* thread); | |
322 static void pd_start_thread(Thread* thread); | |
323 static void start_thread(Thread* thread); | |
324 | |
325 static void initialize_thread(); | |
326 static void free_thread(OSThread* osthread); | |
327 | |
328 // thread id on Linux/64bit is 64bit, on Windows and Solaris, it's 32bit | |
329 static intx current_thread_id(); | |
330 static int current_process_id(); | |
331 // hpi::read for calls from non native state | |
332 // For performance, hpi::read is only callable from _thread_in_native | |
333 static size_t read(int fd, void *buf, unsigned int nBytes); | |
334 static int sleep(Thread* thread, jlong ms, bool interruptable); | |
335 static int naked_sleep(); | |
336 static void infinite_sleep(); // never returns, use with CAUTION | |
337 static void yield(); // Yields to all threads with same priority | |
338 enum YieldResult { | |
339 YIELD_SWITCHED = 1, // caller descheduled, other ready threads exist & ran | |
340 YIELD_NONEREADY = 0, // No other runnable/ready threads. | |
341 // platform-specific yield return immediately | |
342 YIELD_UNKNOWN = -1 // Unknown: platform doesn't support _SWITCHED or _NONEREADY | |
343 // YIELD_SWITCHED and YIELD_NONREADY imply the platform supports a "strong" | |
344 // yield that can be used in lieu of blocking. | |
345 } ; | |
346 static YieldResult NakedYield () ; | |
347 static void yield_all(int attempts = 0); // Yields to all other threads including lower priority | |
348 static void loop_breaker(int attempts); // called from within tight loops to possibly influence time-sharing | |
349 static OSReturn set_priority(Thread* thread, ThreadPriority priority); | |
350 static OSReturn get_priority(const Thread* const thread, ThreadPriority& priority); | |
351 | |
352 static void interrupt(Thread* thread); | |
353 static bool is_interrupted(Thread* thread, bool clear_interrupted); | |
354 | |
355 static int pd_self_suspend_thread(Thread* thread); | |
356 | |
357 static ExtendedPC fetch_frame_from_context(void* ucVoid, intptr_t** sp, intptr_t** fp); | |
358 static frame fetch_frame_from_context(void* ucVoid); | |
359 | |
360 static ExtendedPC get_thread_pc(Thread *thread); | |
361 static void breakpoint(); | |
362 | |
363 static address current_stack_pointer(); | |
364 static address current_stack_base(); | |
365 static size_t current_stack_size(); | |
366 | |
367 static int message_box(const char* title, const char* message); | |
368 static char* do_you_want_to_debug(const char* message); | |
369 | |
370 // run cmd in a separate process and return its exit code; or -1 on failures | |
371 static int fork_and_exec(char *cmd); | |
372 | |
373 // Set file to send error reports. | |
374 static void set_error_file(const char *logfile); | |
375 | |
376 // os::exit() is merged with vm_exit() | |
377 // static void exit(int num); | |
378 | |
379 // Terminate the VM, but don't exit the process | |
380 static void shutdown(); | |
381 | |
382 // Terminate with an error. Default is to generate a core file on platforms | |
383 // that support such things. This calls shutdown() and then aborts. | |
384 static void abort(bool dump_core = true); | |
385 | |
386 // Die immediately, no exit hook, no abort hook, no cleanup. | |
387 static void die(); | |
388 | |
389 // Reading directories. | |
390 static DIR* opendir(const char* dirname); | |
391 static int readdir_buf_size(const char *path); | |
392 static struct dirent* readdir(DIR* dirp, dirent* dbuf); | |
393 static int closedir(DIR* dirp); | |
394 | |
395 // Dynamic library extension | |
396 static const char* dll_file_extension(); | |
397 | |
398 static const char* get_temp_directory(); | |
399 static const char* get_current_directory(char *buf, int buflen); | |
400 | |
401 // Symbol lookup, find nearest function name; basically it implements | |
402 // dladdr() for all platforms. Name of the nearest function is copied | |
403 // to buf. Distance from its base address is returned as offset. | |
404 // If function name is not found, buf[0] is set to '\0' and offset is | |
405 // set to -1. | |
406 static bool dll_address_to_function_name(address addr, char* buf, | |
407 int buflen, int* offset); | |
408 | |
409 // Locate DLL/DSO. On success, full path of the library is copied to | |
410 // buf, and offset is set to be the distance between addr and the | |
411 // library's base address. On failure, buf[0] is set to '\0' and | |
412 // offset is set to -1. | |
413 static bool dll_address_to_library_name(address addr, char* buf, | |
414 int buflen, int* offset); | |
415 | |
416 // Find out whether the pc is in the static code for jvm.dll/libjvm.so. | |
417 static bool address_is_in_vm(address addr); | |
418 | |
419 // Loads .dll/.so and | |
420 // in case of error it checks if .dll/.so was built for the | |
421 // same architecture as Hotspot is running on | |
422 static void* dll_load(const char *name, char *ebuf, int ebuflen); | |
423 | |
424 // Print out system information; they are called by fatal error handler. | |
425 // Output format may be different on different platforms. | |
426 static void print_os_info(outputStream* st); | |
427 static void print_cpu_info(outputStream* st); | |
428 static void print_memory_info(outputStream* st); | |
429 static void print_dll_info(outputStream* st); | |
430 static void print_environment_variables(outputStream* st, const char** env_list, char* buffer, int len); | |
431 static void print_context(outputStream* st, void* context); | |
432 static void print_siginfo(outputStream* st, void* siginfo); | |
433 static void print_signal_handlers(outputStream* st, char* buf, size_t buflen); | |
434 static void print_date_and_time(outputStream* st); | |
435 | |
436 // The following two functions are used by fatal error handler to trace | |
437 // native (C) frames. They are not part of frame.hpp/frame.cpp because | |
438 // frame.hpp/cpp assume thread is JavaThread, and also because different | |
439 // OS/compiler may have different convention or provide different API to | |
440 // walk C frames. | |
441 // | |
442 // We don't attempt to become a debugger, so we only follow frames if that | |
443 // does not require a lookup in the unwind table, which is part of the binary | |
444 // file but may be unsafe to read after a fatal error. So on x86, we can | |
445 // only walk stack if %ebp is used as frame pointer; on ia64, it's not | |
446 // possible to walk C stack without having the unwind table. | |
447 static bool is_first_C_frame(frame *fr); | |
448 static frame get_sender_for_C_frame(frame *fr); | |
449 | |
450 // return current frame. pc() and sp() are set to NULL on failure. | |
451 static frame current_frame(); | |
452 | |
453 static void print_hex_dump(outputStream* st, address start, address end, int unitsize); | |
454 | |
455 // returns a string to describe the exception/signal; | |
456 // returns NULL if exception_code is not an OS exception/signal. | |
457 static const char* exception_name(int exception_code, char* buf, size_t buflen); | |
458 | |
459 // Returns native Java library, loads if necessary | |
460 static void* native_java_library(); | |
461 | |
462 // Fills in path to jvm.dll/libjvm.so (this info used to find hpi). | |
463 static void jvm_path(char *buf, jint buflen); | |
464 | |
465 // JNI names | |
466 static void print_jni_name_prefix_on(outputStream* st, int args_size); | |
467 static void print_jni_name_suffix_on(outputStream* st, int args_size); | |
468 | |
469 // File conventions | |
470 static const char* file_separator(); | |
471 static const char* line_separator(); | |
472 static const char* path_separator(); | |
473 | |
474 // Init os specific system properties values | |
475 static void init_system_properties_values(); | |
476 | |
477 // IO operations, non-JVM_ version. | |
478 static int stat(const char* path, struct stat* sbuf); | |
479 static bool dir_is_empty(const char* path); | |
480 | |
481 // IO operations on binary files | |
482 static int create_binary_file(const char* path, bool rewrite_existing); | |
483 static jlong current_file_offset(int fd); | |
484 static jlong seek_to_file_offset(int fd, jlong offset); | |
485 | |
486 // Thread Local Storage | |
487 static int allocate_thread_local_storage(); | |
488 static void thread_local_storage_at_put(int index, void* value); | |
489 static void* thread_local_storage_at(int index); | |
490 static void free_thread_local_storage(int index); | |
491 | |
492 // General allocation (must be MT-safe) | |
493 static void* malloc (size_t size); | |
494 static void* realloc (void *memblock, size_t size); | |
495 static void free (void *memblock); | |
496 static bool check_heap(bool force = false); // verify C heap integrity | |
497 static char* strdup(const char *); // Like strdup | |
498 | |
499 #ifndef PRODUCT | |
500 static int num_mallocs; // # of calls to malloc/realloc | |
501 static size_t alloc_bytes; // # of bytes allocated | |
502 static int num_frees; // # of calls to free | |
503 #endif | |
504 | |
505 // Printing 64 bit integers | |
506 static const char* jlong_format_specifier(); | |
507 static const char* julong_format_specifier(); | |
508 | |
509 // Support for signals (see JVM_RaiseSignal, JVM_RegisterSignal) | |
510 static void signal_init(); | |
511 static void signal_init_pd(); | |
512 static void signal_notify(int signal_number); | |
513 static void* signal(int signal_number, void* handler); | |
514 static void signal_raise(int signal_number); | |
515 static int signal_wait(); | |
516 static int signal_lookup(); | |
517 static void* user_handler(); | |
518 static void terminate_signal_thread(); | |
519 static int sigexitnum_pd(); | |
520 | |
521 // random number generation | |
522 static long random(); // return 32bit pseudorandom number | |
523 static void init_random(long initval); // initialize random sequence | |
524 | |
525 // Structured OS Exception support | |
526 static void os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread); | |
527 | |
528 // JVMTI & JVM monitoring and management support | |
529 // The thread_cpu_time() and current_thread_cpu_time() are only | |
530 // supported if is_thread_cpu_time_supported() returns true. | |
531 // They are not supported on Solaris T1. | |
532 | |
533 // Thread CPU Time - return the fast estimate on a platform | |
534 // On Solaris - call gethrvtime (fast) - user time only | |
535 // On Linux - fast clock_gettime where available - user+sys | |
536 // - otherwise: very slow /proc fs - user+sys | |
537 // On Windows - GetThreadTimes - user+sys | |
538 static jlong current_thread_cpu_time(); | |
539 static jlong thread_cpu_time(Thread* t); | |
540 | |
541 // Thread CPU Time with user_sys_cpu_time parameter. | |
542 // | |
543 // If user_sys_cpu_time is true, user+sys time is returned. | |
544 // Otherwise, only user time is returned | |
545 static jlong current_thread_cpu_time(bool user_sys_cpu_time); | |
546 static jlong thread_cpu_time(Thread* t, bool user_sys_cpu_time); | |
547 | |
548 // Return a bunch of info about the timers. | |
549 // Note that the returned info for these two functions may be different | |
550 // on some platforms | |
551 static void current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr); | |
552 static void thread_cpu_time_info(jvmtiTimerInfo *info_ptr); | |
553 | |
554 static bool is_thread_cpu_time_supported(); | |
555 | |
556 // System loadavg support. Returns -1 if load average cannot be obtained. | |
557 static int loadavg(double loadavg[], int nelem); | |
558 | |
559 // Hook for os specific jvm options that we don't want to abort on seeing | |
560 static bool obsolete_option(const JavaVMOption *option); | |
561 | |
562 // Platform dependent stuff | |
563 #include "incls/_os_pd.hpp.incl" | |
564 | |
565 // debugging support (mostly used by debug.cpp) | |
566 static bool find(address pc) PRODUCT_RETURN0; // OS specific function to make sense out of an address | |
567 | |
568 static bool dont_yield(); // when true, JVM_Yield() is nop | |
569 static void print_statistics(); | |
570 | |
571 // Thread priority helpers (implemented in OS-specific part) | |
572 static OSReturn set_native_priority(Thread* thread, int native_prio); | |
573 static OSReturn get_native_priority(const Thread* const thread, int* priority_ptr); | |
574 static int java_to_os_priority[MaxPriority + 1]; | |
575 // Hint to the underlying OS that a task switch would not be good. | |
576 // Void return because it's a hint and can fail. | |
577 static void hint_no_preempt(); | |
578 | |
579 // Used at creation if requested by the diagnostic flag PauseAtStartup. | |
580 // Causes the VM to wait until an external stimulus has been applied | |
581 // (for Unix, that stimulus is a signal, for Windows, an external | |
582 // ResumeThread call) | |
583 static void pause(); | |
584 | |
585 protected: | |
586 static long _rand_seed; // seed for random number generator | |
587 static int _processor_count; // number of processors | |
588 | |
589 static char* format_boot_path(const char* format_string, | |
590 const char* home, | |
591 int home_len, | |
592 char fileSep, | |
593 char pathSep); | |
594 static bool set_boot_path(char fileSep, char pathSep); | |
595 }; | |
596 | |
597 // Note that "PAUSE" is almost always used with synchronization | |
598 // so arguably we should provide Atomic::SpinPause() instead | |
599 // of the global SpinPause() with C linkage. | |
600 // It'd also be eligible for inlining on many platforms. | |
601 | |
602 extern "C" int SpinPause () ; | |
603 extern "C" int SafeFetch32 (int * adr, int errValue) ; | |
604 extern "C" intptr_t SafeFetchN (intptr_t * adr, intptr_t errValue) ; |