Mercurial > hg > truffle
annotate src/share/vm/runtime/os.hpp @ 3109:3664989976e2
Merge
author | Gilles Duboscq <gilles.duboscq@oracle.com> |
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date | Fri, 01 Jul 2011 12:57:10 +0200 |
parents | 677234770800 |
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rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_RUNTIME_OS_HPP |
26 #define SHARE_VM_RUNTIME_OS_HPP | |
27 | |
28 #include "jvmtifiles/jvmti.h" | |
29 #include "runtime/atomic.hpp" | |
30 #include "runtime/extendedPC.hpp" | |
31 #include "runtime/handles.hpp" | |
32 #include "utilities/top.hpp" | |
33 #ifdef TARGET_OS_FAMILY_linux | |
34 # include "jvm_linux.h" | |
35 #endif | |
36 #ifdef TARGET_OS_FAMILY_solaris | |
37 # include "jvm_solaris.h" | |
38 #endif | |
39 #ifdef TARGET_OS_FAMILY_windows | |
40 # include "jvm_windows.h" | |
41 #endif | |
42 | |
0 | 43 // os defines the interface to operating system; this includes traditional |
44 // OS services (time, I/O) as well as other functionality with system- | |
45 // dependent code. | |
46 | |
47 typedef void (*dll_func)(...); | |
48 | |
49 class Thread; | |
50 class JavaThread; | |
51 class Event; | |
52 class DLL; | |
53 class FileHandle; | |
141 | 54 template<class E> class GrowableArray; |
0 | 55 |
56 // %%%%% Moved ThreadState, START_FN, OSThread to new osThread.hpp. -- Rose | |
57 | |
58 // Platform-independent error return values from OS functions | |
59 enum OSReturn { | |
60 OS_OK = 0, // Operation was successful | |
61 OS_ERR = -1, // Operation failed | |
62 OS_INTRPT = -2, // Operation was interrupted | |
63 OS_TIMEOUT = -3, // Operation timed out | |
64 OS_NOMEM = -5, // Operation failed for lack of memory | |
65 OS_NORESOURCE = -6 // Operation failed for lack of nonmemory resource | |
66 }; | |
67 | |
68 enum ThreadPriority { // JLS 20.20.1-3 | |
69 NoPriority = -1, // Initial non-priority value | |
70 MinPriority = 1, // Minimum priority | |
71 NormPriority = 5, // Normal (non-daemon) priority | |
72 NearMaxPriority = 9, // High priority, used for VMThread | |
73 MaxPriority = 10 // Highest priority, used for WatcherThread | |
74 // ensures that VMThread doesn't starve profiler | |
75 }; | |
76 | |
77 // Typedef for structured exception handling support | |
78 typedef void (*java_call_t)(JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread); | |
79 | |
80 class os: AllStatic { | |
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81 public: |
0 | 82 enum { page_sizes_max = 9 }; // Size of _page_sizes array (8 plus a sentinel) |
83 | |
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84 private: |
0 | 85 static OSThread* _starting_thread; |
86 static address _polling_page; | |
87 static volatile int32_t * _mem_serialize_page; | |
88 static uintptr_t _serialize_page_mask; | |
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89 public: |
0 | 90 static size_t _page_sizes[page_sizes_max]; |
91 | |
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92 private: |
0 | 93 static void init_page_sizes(size_t default_page_size) { |
94 _page_sizes[0] = default_page_size; | |
95 _page_sizes[1] = 0; // sentinel | |
96 } | |
97 | |
98 public: | |
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99 |
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100 static void init(void); // Called before command line parsing |
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101 static jint init_2(void); // Called after command line parsing |
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102 static void init_3(void); // Called at the end of vm init |
0 | 103 |
104 // File names are case-insensitive on windows only | |
105 // Override me as needed | |
106 static int file_name_strcmp(const char* s1, const char* s2); | |
107 | |
108 static bool getenv(const char* name, char* buffer, int len); | |
109 static bool have_special_privileges(); | |
110 | |
111 static jlong javaTimeMillis(); | |
112 static jlong javaTimeNanos(); | |
113 static void javaTimeNanos_info(jvmtiTimerInfo *info_ptr); | |
114 static void run_periodic_checks(); | |
115 | |
116 | |
117 // Returns the elapsed time in seconds since the vm started. | |
118 static double elapsedTime(); | |
119 | |
120 // Returns real time in seconds since an arbitrary point | |
121 // in the past. | |
122 static bool getTimesSecs(double* process_real_time, | |
123 double* process_user_time, | |
124 double* process_system_time); | |
125 | |
126 // Interface to the performance counter | |
127 static jlong elapsed_counter(); | |
128 static jlong elapsed_frequency(); | |
129 | |
342
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130 // The "virtual time" of a thread is the amount of time a thread has |
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131 // actually run. The first function indicates whether the OS supports |
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132 // this functionality for the current thread, and if so: |
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133 // * the second enables vtime tracking (if that is required). |
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134 // * the third tells whether vtime is enabled. |
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135 // * the fourth returns the elapsed virtual time for the current |
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136 // thread. |
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137 static bool supports_vtime(); |
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138 static bool enable_vtime(); |
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139 static bool vtime_enabled(); |
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140 static double elapsedVTime(); |
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141 |
0 | 142 // Return current local time in a string (YYYY-MM-DD HH:MM:SS). |
143 // It is MT safe, but not async-safe, as reading time zone | |
144 // information may require a lock on some platforms. | |
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145 static char* local_time_string(char *buf, size_t buflen); |
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146 static struct tm* localtime_pd (const time_t* clock, struct tm* res); |
0 | 147 // Fill in buffer with current local time as an ISO-8601 string. |
148 // E.g., YYYY-MM-DDThh:mm:ss.mmm+zzzz. | |
149 // Returns buffer, or NULL if it failed. | |
150 static char* iso8601_time(char* buffer, size_t buffer_length); | |
151 | |
152 // Interface for detecting multiprocessor system | |
153 static inline bool is_MP() { | |
154 assert(_processor_count > 0, "invalid processor count"); | |
155 return _processor_count > 1; | |
156 } | |
157 static julong available_memory(); | |
158 static julong physical_memory(); | |
159 static julong allocatable_physical_memory(julong size); | |
160 static bool is_server_class_machine(); | |
161 | |
162 // number of CPUs | |
163 static int processor_count() { | |
164 return _processor_count; | |
165 } | |
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166 static void set_processor_count(int count) { _processor_count = count; } |
0 | 167 |
168 // Returns the number of CPUs this process is currently allowed to run on. | |
169 // Note that on some OSes this can change dynamically. | |
170 static int active_processor_count(); | |
171 | |
172 // Bind processes to processors. | |
173 // This is a two step procedure: | |
174 // first you generate a distribution of processes to processors, | |
175 // then you bind processes according to that distribution. | |
176 // Compute a distribution for number of processes to processors. | |
177 // Stores the processor id's into the distribution array argument. | |
178 // Returns true if it worked, false if it didn't. | |
179 static bool distribute_processes(uint length, uint* distribution); | |
180 // Binds the current process to a processor. | |
181 // Returns true if it worked, false if it didn't. | |
182 static bool bind_to_processor(uint processor_id); | |
183 | |
184 // Interface for stack banging (predetect possible stack overflow for | |
185 // exception processing) There are guard pages, and above that shadow | |
186 // pages for stack overflow checking. | |
187 static bool uses_stack_guard_pages(); | |
188 static bool allocate_stack_guard_pages(); | |
189 static void bang_stack_shadow_pages(); | |
190 static bool stack_shadow_pages_available(Thread *thread, methodHandle method); | |
191 | |
192 // OS interface to Virtual Memory | |
193 | |
194 // Return the default page size. | |
195 static int vm_page_size(); | |
196 | |
197 // Return the page size to use for a region of memory. The min_pages argument | |
198 // is a hint intended to limit fragmentation; it says the returned page size | |
199 // should be <= region_max_size / min_pages. Because min_pages is a hint, | |
200 // this routine may return a size larger than region_max_size / min_pages. | |
201 // | |
202 // The current implementation ignores min_pages if a larger page size is an | |
203 // exact multiple of both region_min_size and region_max_size. This allows | |
204 // larger pages to be used when doing so would not cause fragmentation; in | |
205 // particular, a single page can be used when region_min_size == | |
206 // region_max_size == a supported page size. | |
207 static size_t page_size_for_region(size_t region_min_size, | |
208 size_t region_max_size, | |
209 uint min_pages); | |
210 | |
211 // Method for tracing page sizes returned by the above method; enabled by | |
212 // TracePageSizes. The region_{min,max}_size parameters should be the values | |
213 // passed to page_size_for_region() and page_size should be the result of that | |
214 // call. The (optional) base and size parameters should come from the | |
215 // ReservedSpace base() and size() methods. | |
216 static void trace_page_sizes(const char* str, const size_t region_min_size, | |
217 const size_t region_max_size, | |
218 const size_t page_size, | |
219 const char* base = NULL, | |
220 const size_t size = 0) PRODUCT_RETURN; | |
221 | |
222 static int vm_allocation_granularity(); | |
223 static char* reserve_memory(size_t bytes, char* addr = 0, | |
224 size_t alignment_hint = 0); | |
225 static char* attempt_reserve_memory_at(size_t bytes, char* addr); | |
226 static void split_reserved_memory(char *base, size_t size, | |
227 size_t split, bool realloc); | |
656 | 228 static bool commit_memory(char* addr, size_t bytes, |
229 bool executable = false); | |
230 static bool commit_memory(char* addr, size_t size, size_t alignment_hint, | |
231 bool executable = false); | |
0 | 232 static bool uncommit_memory(char* addr, size_t bytes); |
233 static bool release_memory(char* addr, size_t bytes); | |
237
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234 |
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235 enum ProtType { MEM_PROT_NONE, MEM_PROT_READ, MEM_PROT_RW, MEM_PROT_RWX }; |
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236 static bool protect_memory(char* addr, size_t bytes, ProtType prot, |
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237 bool is_committed = true); |
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238 |
0 | 239 static bool guard_memory(char* addr, size_t bytes); |
240 static bool unguard_memory(char* addr, size_t bytes); | |
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241 static bool create_stack_guard_pages(char* addr, size_t bytes); |
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242 static bool remove_stack_guard_pages(char* addr, size_t bytes); |
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243 |
0 | 244 static char* map_memory(int fd, const char* file_name, size_t file_offset, |
245 char *addr, size_t bytes, bool read_only = false, | |
246 bool allow_exec = false); | |
247 static char* remap_memory(int fd, const char* file_name, size_t file_offset, | |
248 char *addr, size_t bytes, bool read_only, | |
249 bool allow_exec); | |
250 static bool unmap_memory(char *addr, size_t bytes); | |
251 static void free_memory(char *addr, size_t bytes); | |
252 static void realign_memory(char *addr, size_t bytes, size_t alignment_hint); | |
253 | |
254 // NUMA-specific interface | |
141 | 255 static bool numa_has_static_binding(); |
256 static bool numa_has_group_homing(); | |
257 static void numa_make_local(char *addr, size_t bytes, int lgrp_hint); | |
0 | 258 static void numa_make_global(char *addr, size_t bytes); |
259 static size_t numa_get_groups_num(); | |
260 static size_t numa_get_leaf_groups(int *ids, size_t size); | |
261 static bool numa_topology_changed(); | |
262 static int numa_get_group_id(); | |
263 | |
264 // Page manipulation | |
265 struct page_info { | |
266 size_t size; | |
267 int lgrp_id; | |
268 }; | |
269 static bool get_page_info(char *start, page_info* info); | |
270 static char* scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found); | |
271 | |
272 static char* non_memory_address_word(); | |
273 // reserve, commit and pin the entire memory region | |
656 | 274 static char* reserve_memory_special(size_t size, char* addr = NULL, |
275 bool executable = false); | |
0 | 276 static bool release_memory_special(char* addr, size_t bytes); |
277 static bool large_page_init(); | |
278 static size_t large_page_size(); | |
279 static bool can_commit_large_page_memory(); | |
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280 static bool can_execute_large_page_memory(); |
0 | 281 |
282 // OS interface to polling page | |
283 static address get_polling_page() { return _polling_page; } | |
284 static void set_polling_page(address page) { _polling_page = page; } | |
285 static bool is_poll_address(address addr) { return addr >= _polling_page && addr < (_polling_page + os::vm_page_size()); } | |
286 static void make_polling_page_unreadable(); | |
287 static void make_polling_page_readable(); | |
288 | |
289 // Routines used to serialize the thread state without using membars | |
290 static void serialize_thread_states(); | |
291 | |
292 // Since we write to the serialize page from every thread, we | |
293 // want stores to be on unique cache lines whenever possible | |
294 // in order to minimize CPU cross talk. We pre-compute the | |
295 // amount to shift the thread* to make this offset unique to | |
296 // each thread. | |
297 static int get_serialize_page_shift_count() { | |
298 return SerializePageShiftCount; | |
299 } | |
300 | |
301 static void set_serialize_page_mask(uintptr_t mask) { | |
302 _serialize_page_mask = mask; | |
303 } | |
304 | |
305 static unsigned int get_serialize_page_mask() { | |
306 return _serialize_page_mask; | |
307 } | |
308 | |
309 static void set_memory_serialize_page(address page); | |
310 | |
311 static address get_memory_serialize_page() { | |
312 return (address)_mem_serialize_page; | |
313 } | |
314 | |
315 static inline void write_memory_serialize_page(JavaThread *thread) { | |
316 uintptr_t page_offset = ((uintptr_t)thread >> | |
317 get_serialize_page_shift_count()) & | |
318 get_serialize_page_mask(); | |
319 *(volatile int32_t *)((uintptr_t)_mem_serialize_page+page_offset) = 1; | |
320 } | |
321 | |
322 static bool is_memory_serialize_page(JavaThread *thread, address addr) { | |
323 if (UseMembar) return false; | |
1078 | 324 // Previously this function calculated the exact address of this |
325 // thread's serialize page, and checked if the faulting address | |
326 // was equal. However, some platforms mask off faulting addresses | |
327 // to the page size, so now we just check that the address is | |
328 // within the page. This makes the thread argument unnecessary, | |
329 // but we retain the NULL check to preserve existing behaviour. | |
0 | 330 if (thread == NULL) return false; |
1078 | 331 address page = (address) _mem_serialize_page; |
332 return addr >= page && addr < (page + os::vm_page_size()); | |
0 | 333 } |
334 | |
335 static void block_on_serialize_page_trap(); | |
336 | |
337 // threads | |
338 | |
339 enum ThreadType { | |
340 vm_thread, | |
341 cgc_thread, // Concurrent GC thread | |
342 pgc_thread, // Parallel GC thread | |
343 java_thread, | |
344 compiler_thread, | |
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345 watcher_thread, |
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346 os_thread |
0 | 347 }; |
348 | |
349 static bool create_thread(Thread* thread, | |
350 ThreadType thr_type, | |
351 size_t stack_size = 0); | |
352 static bool create_main_thread(JavaThread* thread); | |
353 static bool create_attached_thread(JavaThread* thread); | |
354 static void pd_start_thread(Thread* thread); | |
355 static void start_thread(Thread* thread); | |
356 | |
357 static void initialize_thread(); | |
358 static void free_thread(OSThread* osthread); | |
359 | |
360 // thread id on Linux/64bit is 64bit, on Windows and Solaris, it's 32bit | |
361 static intx current_thread_id(); | |
362 static int current_process_id(); | |
363 static int sleep(Thread* thread, jlong ms, bool interruptable); | |
364 static int naked_sleep(); | |
365 static void infinite_sleep(); // never returns, use with CAUTION | |
366 static void yield(); // Yields to all threads with same priority | |
367 enum YieldResult { | |
368 YIELD_SWITCHED = 1, // caller descheduled, other ready threads exist & ran | |
369 YIELD_NONEREADY = 0, // No other runnable/ready threads. | |
370 // platform-specific yield return immediately | |
371 YIELD_UNKNOWN = -1 // Unknown: platform doesn't support _SWITCHED or _NONEREADY | |
372 // YIELD_SWITCHED and YIELD_NONREADY imply the platform supports a "strong" | |
373 // yield that can be used in lieu of blocking. | |
374 } ; | |
375 static YieldResult NakedYield () ; | |
376 static void yield_all(int attempts = 0); // Yields to all other threads including lower priority | |
377 static void loop_breaker(int attempts); // called from within tight loops to possibly influence time-sharing | |
378 static OSReturn set_priority(Thread* thread, ThreadPriority priority); | |
379 static OSReturn get_priority(const Thread* const thread, ThreadPriority& priority); | |
380 | |
381 static void interrupt(Thread* thread); | |
382 static bool is_interrupted(Thread* thread, bool clear_interrupted); | |
383 | |
384 static int pd_self_suspend_thread(Thread* thread); | |
385 | |
386 static ExtendedPC fetch_frame_from_context(void* ucVoid, intptr_t** sp, intptr_t** fp); | |
387 static frame fetch_frame_from_context(void* ucVoid); | |
388 | |
389 static ExtendedPC get_thread_pc(Thread *thread); | |
390 static void breakpoint(); | |
391 | |
392 static address current_stack_pointer(); | |
393 static address current_stack_base(); | |
394 static size_t current_stack_size(); | |
395 | |
396 static int message_box(const char* title, const char* message); | |
397 static char* do_you_want_to_debug(const char* message); | |
398 | |
399 // run cmd in a separate process and return its exit code; or -1 on failures | |
400 static int fork_and_exec(char *cmd); | |
401 | |
402 // Set file to send error reports. | |
403 static void set_error_file(const char *logfile); | |
404 | |
405 // os::exit() is merged with vm_exit() | |
406 // static void exit(int num); | |
407 | |
408 // Terminate the VM, but don't exit the process | |
409 static void shutdown(); | |
410 | |
411 // Terminate with an error. Default is to generate a core file on platforms | |
412 // that support such things. This calls shutdown() and then aborts. | |
413 static void abort(bool dump_core = true); | |
414 | |
415 // Die immediately, no exit hook, no abort hook, no cleanup. | |
416 static void die(); | |
417 | |
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418 // File i/o operations |
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419 static const int default_file_open_flags(); |
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420 static int open(const char *path, int oflag, int mode); |
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421 static int close(int fd); |
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422 static jlong lseek(int fd, jlong offset, int whence); |
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423 static char* native_path(char *path); |
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424 static int ftruncate(int fd, jlong length); |
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425 static int fsync(int fd); |
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426 static int available(int fd, jlong *bytes); |
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427 |
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428 //File i/o operations |
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429 |
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430 static size_t read(int fd, void *buf, unsigned int nBytes); |
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431 static size_t restartable_read(int fd, void *buf, unsigned int nBytes); |
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432 static size_t write(int fd, const void *buf, unsigned int nBytes); |
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433 |
0 | 434 // Reading directories. |
435 static DIR* opendir(const char* dirname); | |
436 static int readdir_buf_size(const char *path); | |
437 static struct dirent* readdir(DIR* dirp, dirent* dbuf); | |
438 static int closedir(DIR* dirp); | |
439 | |
440 // Dynamic library extension | |
441 static const char* dll_file_extension(); | |
442 | |
443 static const char* get_temp_directory(); | |
444 static const char* get_current_directory(char *buf, int buflen); | |
445 | |
242 | 446 // Builds a platform-specific full library path given a ld path and lib name |
447 static void dll_build_name(char* buffer, size_t size, | |
448 const char* pathname, const char* fname); | |
449 | |
0 | 450 // Symbol lookup, find nearest function name; basically it implements |
451 // dladdr() for all platforms. Name of the nearest function is copied | |
452 // to buf. Distance from its base address is returned as offset. | |
453 // If function name is not found, buf[0] is set to '\0' and offset is | |
454 // set to -1. | |
455 static bool dll_address_to_function_name(address addr, char* buf, | |
456 int buflen, int* offset); | |
457 | |
458 // Locate DLL/DSO. On success, full path of the library is copied to | |
459 // buf, and offset is set to be the distance between addr and the | |
460 // library's base address. On failure, buf[0] is set to '\0' and | |
461 // offset is set to -1. | |
462 static bool dll_address_to_library_name(address addr, char* buf, | |
463 int buflen, int* offset); | |
464 | |
465 // Find out whether the pc is in the static code for jvm.dll/libjvm.so. | |
466 static bool address_is_in_vm(address addr); | |
467 | |
468 // Loads .dll/.so and | |
469 // in case of error it checks if .dll/.so was built for the | |
470 // same architecture as Hotspot is running on | |
471 static void* dll_load(const char *name, char *ebuf, int ebuflen); | |
472 | |
242 | 473 // lookup symbol in a shared library |
474 static void* dll_lookup(void* handle, const char* name); | |
475 | |
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476 // Unload library |
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477 static void dll_unload(void *lib); |
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478 |
0 | 479 // Print out system information; they are called by fatal error handler. |
480 // Output format may be different on different platforms. | |
481 static void print_os_info(outputStream* st); | |
482 static void print_cpu_info(outputStream* st); | |
483 static void print_memory_info(outputStream* st); | |
484 static void print_dll_info(outputStream* st); | |
485 static void print_environment_variables(outputStream* st, const char** env_list, char* buffer, int len); | |
486 static void print_context(outputStream* st, void* context); | |
1907 | 487 static void print_register_info(outputStream* st, void* context); |
0 | 488 static void print_siginfo(outputStream* st, void* siginfo); |
489 static void print_signal_handlers(outputStream* st, char* buf, size_t buflen); | |
490 static void print_date_and_time(outputStream* st); | |
491 | |
1907 | 492 static void print_location(outputStream* st, intptr_t x, bool verbose = false); |
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493 static size_t lasterror(char *buf, size_t len); |
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494 |
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495 // Determines whether the calling process is being debugged by a user-mode debugger. |
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496 static bool is_debugger_attached(); |
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497 |
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498 // wait for a key press if PauseAtExit is set |
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499 static void wait_for_keypress_at_exit(void); |
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500 |
0 | 501 // The following two functions are used by fatal error handler to trace |
502 // native (C) frames. They are not part of frame.hpp/frame.cpp because | |
503 // frame.hpp/cpp assume thread is JavaThread, and also because different | |
504 // OS/compiler may have different convention or provide different API to | |
505 // walk C frames. | |
506 // | |
507 // We don't attempt to become a debugger, so we only follow frames if that | |
508 // does not require a lookup in the unwind table, which is part of the binary | |
509 // file but may be unsafe to read after a fatal error. So on x86, we can | |
510 // only walk stack if %ebp is used as frame pointer; on ia64, it's not | |
511 // possible to walk C stack without having the unwind table. | |
512 static bool is_first_C_frame(frame *fr); | |
513 static frame get_sender_for_C_frame(frame *fr); | |
514 | |
515 // return current frame. pc() and sp() are set to NULL on failure. | |
516 static frame current_frame(); | |
517 | |
518 static void print_hex_dump(outputStream* st, address start, address end, int unitsize); | |
519 | |
520 // returns a string to describe the exception/signal; | |
521 // returns NULL if exception_code is not an OS exception/signal. | |
522 static const char* exception_name(int exception_code, char* buf, size_t buflen); | |
523 | |
524 // Returns native Java library, loads if necessary | |
525 static void* native_java_library(); | |
526 | |
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527 // Fills in path to jvm.dll/libjvm.so (used by the Disassembler) |
0 | 528 static void jvm_path(char *buf, jint buflen); |
529 | |
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530 // Returns true if we are running in a headless jre. |
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531 static bool is_headless_jre(); |
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532 |
0 | 533 // JNI names |
534 static void print_jni_name_prefix_on(outputStream* st, int args_size); | |
535 static void print_jni_name_suffix_on(outputStream* st, int args_size); | |
536 | |
537 // File conventions | |
538 static const char* file_separator(); | |
539 static const char* line_separator(); | |
540 static const char* path_separator(); | |
541 | |
542 // Init os specific system properties values | |
543 static void init_system_properties_values(); | |
544 | |
545 // IO operations, non-JVM_ version. | |
546 static int stat(const char* path, struct stat* sbuf); | |
547 static bool dir_is_empty(const char* path); | |
548 | |
549 // IO operations on binary files | |
550 static int create_binary_file(const char* path, bool rewrite_existing); | |
551 static jlong current_file_offset(int fd); | |
552 static jlong seek_to_file_offset(int fd, jlong offset); | |
553 | |
554 // Thread Local Storage | |
555 static int allocate_thread_local_storage(); | |
556 static void thread_local_storage_at_put(int index, void* value); | |
557 static void* thread_local_storage_at(int index); | |
558 static void free_thread_local_storage(int index); | |
559 | |
560 // General allocation (must be MT-safe) | |
561 static void* malloc (size_t size); | |
562 static void* realloc (void *memblock, size_t size); | |
563 static void free (void *memblock); | |
564 static bool check_heap(bool force = false); // verify C heap integrity | |
565 static char* strdup(const char *); // Like strdup | |
566 | |
567 #ifndef PRODUCT | |
2250 | 568 static julong num_mallocs; // # of calls to malloc/realloc |
569 static julong alloc_bytes; // # of bytes allocated | |
570 static julong num_frees; // # of calls to free | |
571 static julong free_bytes; // # of bytes freed | |
0 | 572 #endif |
573 | |
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574 // SocketInterface (ex HPI SocketInterface ) |
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575 static int socket(int domain, int type, int protocol); |
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576 static int socket_close(int fd); |
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577 static int socket_shutdown(int fd, int howto); |
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578 static int recv(int fd, char *buf, int nBytes, int flags); |
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579 static int send(int fd, char *buf, int nBytes, int flags); |
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580 static int raw_send(int fd, char *buf, int nBytes, int flags); |
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581 static int timeout(int fd, long timeout); |
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582 static int listen(int fd, int count); |
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583 static int connect(int fd, struct sockaddr *him, int len); |
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584 static int bind(int fd, struct sockaddr *him, int len); |
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585 static int accept(int fd, struct sockaddr *him, int *len); |
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586 static int recvfrom(int fd, char *buf, int nbytes, int flags, |
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587 struct sockaddr *from, int *fromlen); |
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588 static int get_sock_name(int fd, struct sockaddr *him, int *len); |
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589 static int sendto(int fd, char *buf, int len, int flags, |
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590 struct sockaddr *to, int tolen); |
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591 static int socket_available(int fd, jint *pbytes); |
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592 |
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593 static int get_sock_opt(int fd, int level, int optname, |
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594 char *optval, int* optlen); |
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595 static int set_sock_opt(int fd, int level, int optname, |
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596 const char *optval, int optlen); |
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597 static int get_host_name(char* name, int namelen); |
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598 |
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599 static struct hostent* get_host_by_name(char* name); |
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600 |
0 | 601 // Printing 64 bit integers |
602 static const char* jlong_format_specifier(); | |
603 static const char* julong_format_specifier(); | |
604 | |
605 // Support for signals (see JVM_RaiseSignal, JVM_RegisterSignal) | |
606 static void signal_init(); | |
607 static void signal_init_pd(); | |
608 static void signal_notify(int signal_number); | |
609 static void* signal(int signal_number, void* handler); | |
610 static void signal_raise(int signal_number); | |
611 static int signal_wait(); | |
612 static int signal_lookup(); | |
613 static void* user_handler(); | |
614 static void terminate_signal_thread(); | |
615 static int sigexitnum_pd(); | |
616 | |
617 // random number generation | |
618 static long random(); // return 32bit pseudorandom number | |
619 static void init_random(long initval); // initialize random sequence | |
620 | |
621 // Structured OS Exception support | |
622 static void os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread); | |
623 | |
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624 // On Windows this will create an actual minidump, on Linux/Solaris it will simply check core dump limits |
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625 static void check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize); |
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626 |
0 | 627 // JVMTI & JVM monitoring and management support |
628 // The thread_cpu_time() and current_thread_cpu_time() are only | |
629 // supported if is_thread_cpu_time_supported() returns true. | |
630 // They are not supported on Solaris T1. | |
631 | |
632 // Thread CPU Time - return the fast estimate on a platform | |
633 // On Solaris - call gethrvtime (fast) - user time only | |
634 // On Linux - fast clock_gettime where available - user+sys | |
635 // - otherwise: very slow /proc fs - user+sys | |
636 // On Windows - GetThreadTimes - user+sys | |
637 static jlong current_thread_cpu_time(); | |
638 static jlong thread_cpu_time(Thread* t); | |
639 | |
640 // Thread CPU Time with user_sys_cpu_time parameter. | |
641 // | |
642 // If user_sys_cpu_time is true, user+sys time is returned. | |
643 // Otherwise, only user time is returned | |
644 static jlong current_thread_cpu_time(bool user_sys_cpu_time); | |
645 static jlong thread_cpu_time(Thread* t, bool user_sys_cpu_time); | |
646 | |
647 // Return a bunch of info about the timers. | |
648 // Note that the returned info for these two functions may be different | |
649 // on some platforms | |
650 static void current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr); | |
651 static void thread_cpu_time_info(jvmtiTimerInfo *info_ptr); | |
652 | |
653 static bool is_thread_cpu_time_supported(); | |
654 | |
655 // System loadavg support. Returns -1 if load average cannot be obtained. | |
656 static int loadavg(double loadavg[], int nelem); | |
657 | |
658 // Hook for os specific jvm options that we don't want to abort on seeing | |
659 static bool obsolete_option(const JavaVMOption *option); | |
660 | |
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661 // Read file line by line. If line is longer than bsize, |
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662 // rest of line is skipped. Returns number of bytes read or -1 on EOF |
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663 static int get_line_chars(int fd, char *buf, const size_t bsize); |
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664 |
0 | 665 // Platform dependent stuff |
1972 | 666 #ifdef TARGET_OS_FAMILY_linux |
667 # include "os_linux.hpp" | |
668 #endif | |
669 #ifdef TARGET_OS_FAMILY_solaris | |
670 # include "os_solaris.hpp" | |
671 #endif | |
672 #ifdef TARGET_OS_FAMILY_windows | |
673 # include "os_windows.hpp" | |
674 #endif | |
675 #ifdef TARGET_OS_ARCH_linux_x86 | |
676 # include "os_linux_x86.hpp" | |
677 #endif | |
678 #ifdef TARGET_OS_ARCH_linux_sparc | |
679 # include "os_linux_sparc.hpp" | |
680 #endif | |
681 #ifdef TARGET_OS_ARCH_linux_zero | |
682 # include "os_linux_zero.hpp" | |
683 #endif | |
684 #ifdef TARGET_OS_ARCH_solaris_x86 | |
685 # include "os_solaris_x86.hpp" | |
686 #endif | |
687 #ifdef TARGET_OS_ARCH_solaris_sparc | |
688 # include "os_solaris_sparc.hpp" | |
689 #endif | |
690 #ifdef TARGET_OS_ARCH_windows_x86 | |
691 # include "os_windows_x86.hpp" | |
692 #endif | |
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693 #ifdef TARGET_OS_ARCH_linux_arm |
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694 # include "os_linux_arm.hpp" |
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695 #endif |
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696 #ifdef TARGET_OS_ARCH_linux_ppc |
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697 # include "os_linux_ppc.hpp" |
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698 #endif |
1972 | 699 |
0 | 700 |
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701 // debugging support (mostly used by debug.cpp but also fatal error handler) |
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702 static bool find(address pc, outputStream* st = tty); // OS specific function to make sense out of an address |
0 | 703 |
704 static bool dont_yield(); // when true, JVM_Yield() is nop | |
705 static void print_statistics(); | |
706 | |
707 // Thread priority helpers (implemented in OS-specific part) | |
708 static OSReturn set_native_priority(Thread* thread, int native_prio); | |
709 static OSReturn get_native_priority(const Thread* const thread, int* priority_ptr); | |
710 static int java_to_os_priority[MaxPriority + 1]; | |
711 // Hint to the underlying OS that a task switch would not be good. | |
712 // Void return because it's a hint and can fail. | |
713 static void hint_no_preempt(); | |
714 | |
715 // Used at creation if requested by the diagnostic flag PauseAtStartup. | |
716 // Causes the VM to wait until an external stimulus has been applied | |
717 // (for Unix, that stimulus is a signal, for Windows, an external | |
718 // ResumeThread call) | |
719 static void pause(); | |
720 | |
721 protected: | |
722 static long _rand_seed; // seed for random number generator | |
723 static int _processor_count; // number of processors | |
724 | |
725 static char* format_boot_path(const char* format_string, | |
726 const char* home, | |
727 int home_len, | |
728 char fileSep, | |
729 char pathSep); | |
730 static bool set_boot_path(char fileSep, char pathSep); | |
691 | 731 static char** split_path(const char* path, int* n); |
0 | 732 }; |
733 | |
734 // Note that "PAUSE" is almost always used with synchronization | |
735 // so arguably we should provide Atomic::SpinPause() instead | |
736 // of the global SpinPause() with C linkage. | |
737 // It'd also be eligible for inlining on many platforms. | |
738 | |
739 extern "C" int SpinPause () ; | |
740 extern "C" int SafeFetch32 (int * adr, int errValue) ; | |
741 extern "C" intptr_t SafeFetchN (intptr_t * adr, intptr_t errValue) ; | |
1972 | 742 |
743 #endif // SHARE_VM_RUNTIME_OS_HPP |