1 /*
2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_RUNTIME_OS_HPP
26 #define SHARE_VM_RUNTIME_OS_HPP
27
28 #include "jvmtifiles/jvmti.h"
29 #include "runtime/atomic.hpp"
30 #include "runtime/extendedPC.hpp"
31 #include "runtime/handles.hpp"
32 #include "utilities/top.hpp"
33 #ifdef TARGET_OS_FAMILY_linux
34 # include "jvm_linux.h"
35 #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 #ifdef TARGET_OS_FAMILY_bsd
43 # include "jvm_bsd.h"
44 #endif
45
46 // os defines the interface to operating system; this includes traditional
47 // OS services (time, I/O) as well as other functionality with system-
48 // dependent code.
49
50 typedef void (*dll_func)(...);
51
52 class Thread;
53 class JavaThread;
54 class Event;
55 class DLL;
56 class FileHandle;
57 template<class E> class GrowableArray;
58
59 // %%%%% Moved ThreadState, START_FN, OSThread to new osThread.hpp. -- Rose
60
61 // Platform-independent error return values from OS functions
62 enum OSReturn {
63 OS_OK = 0, // Operation was successful
64 OS_ERR = -1, // Operation failed
65 OS_INTRPT = -2, // Operation was interrupted
66 OS_TIMEOUT = -3, // Operation timed out
67 OS_NOMEM = -5, // Operation failed for lack of memory
68 OS_NORESOURCE = -6 // Operation failed for lack of nonmemory resource
69 };
70
71 enum ThreadPriority { // JLS 20.20.1-3
72 NoPriority = -1, // Initial non-priority value
73 MinPriority = 1, // Minimum priority
74 NormPriority = 5, // Normal (non-daemon) priority
75 NearMaxPriority = 9, // High priority, used for VMThread
76 MaxPriority = 10, // Highest priority, used for WatcherThread
77 // ensures that VMThread doesn't starve profiler
78 CriticalPriority = 11 // Critical thread priority
79 };
80
81 // Typedef for structured exception handling support
82 typedef void (*java_call_t)(JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread);
83
84 class os: AllStatic {
85 public:
86 enum { page_sizes_max = 9 }; // Size of _page_sizes array (8 plus a sentinel)
87
88 private:
89 static OSThread* _starting_thread;
90 static address _polling_page;
91 static volatile int32_t * _mem_serialize_page;
92 static uintptr_t _serialize_page_mask;
93 public:
94 static size_t _page_sizes[page_sizes_max];
95
96 private:
97 static void init_page_sizes(size_t default_page_size) {
98 _page_sizes[0] = default_page_size;
99 _page_sizes[1] = 0; // sentinel
100 }
101
102 static char* pd_reserve_memory(size_t bytes, char* addr = 0,
103 size_t alignment_hint = 0);
104 static char* pd_attempt_reserve_memory_at(size_t bytes, char* addr);
105 static void pd_split_reserved_memory(char *base, size_t size,
106 size_t split, bool realloc);
107 static bool pd_commit_memory(char* addr, size_t bytes, bool executable = false);
108 static bool pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
109 bool executable = false);
110 static bool pd_uncommit_memory(char* addr, size_t bytes);
111 static bool pd_release_memory(char* addr, size_t bytes);
112
113 static char* pd_map_memory(int fd, const char* file_name, size_t file_offset,
114 char *addr, size_t bytes, bool read_only = false,
115 bool allow_exec = false);
116 static char* pd_remap_memory(int fd, const char* file_name, size_t file_offset,
117 char *addr, size_t bytes, bool read_only,
118 bool allow_exec);
119 static bool pd_unmap_memory(char *addr, size_t bytes);
120 static void pd_free_memory(char *addr, size_t bytes, size_t alignment_hint);
121 static void pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint);
122
123
124 public:
125 static void init(void); // Called before command line parsing
126 static jint init_2(void); // Called after command line parsing
127 static void init_globals(void) { // Called from init_globals() in init.cpp
128 init_globals_ext();
129 }
130 static void init_3(void); // Called at the end of vm init
131
132 // File names are case-insensitive on windows only
133 // Override me as needed
134 static int file_name_strcmp(const char* s1, const char* s2);
135
136 static bool getenv(const char* name, char* buffer, int len);
137 static bool have_special_privileges();
138
139 static jlong javaTimeMillis();
140 static jlong javaTimeNanos();
141 static void javaTimeNanos_info(jvmtiTimerInfo *info_ptr);
142 static void run_periodic_checks();
143
144
145 // Returns the elapsed time in seconds since the vm started.
146 static double elapsedTime();
147
148 // Returns real time in seconds since an arbitrary point
149 // in the past.
150 static bool getTimesSecs(double* process_real_time,
151 double* process_user_time,
152 double* process_system_time);
153
154 // Interface to the performance counter
155 static jlong elapsed_counter();
156 static jlong elapsed_frequency();
157
158 // The "virtual time" of a thread is the amount of time a thread has
159 // actually run. The first function indicates whether the OS supports
160 // this functionality for the current thread, and if so:
161 // * the second enables vtime tracking (if that is required).
162 // * the third tells whether vtime is enabled.
163 // * the fourth returns the elapsed virtual time for the current
164 // thread.
165 static bool supports_vtime();
166 static bool enable_vtime();
167 static bool vtime_enabled();
168 static double elapsedVTime();
169
170 // Return current local time in a string (YYYY-MM-DD HH:MM:SS).
171 // It is MT safe, but not async-safe, as reading time zone
172 // information may require a lock on some platforms.
173 static char* local_time_string(char *buf, size_t buflen);
174 static struct tm* localtime_pd (const time_t* clock, struct tm* res);
175 // Fill in buffer with current local time as an ISO-8601 string.
176 // E.g., YYYY-MM-DDThh:mm:ss.mmm+zzzz.
177 // Returns buffer, or NULL if it failed.
178 static char* iso8601_time(char* buffer, size_t buffer_length);
179
180 // Interface for detecting multiprocessor system
181 static inline bool is_MP() {
182 assert(_processor_count > 0, "invalid processor count");
183 return _processor_count > 1;
184 }
185 static julong available_memory();
186 static julong physical_memory();
187 static julong allocatable_physical_memory(julong size);
188 static bool is_server_class_machine();
189
190 // number of CPUs
191 static int processor_count() {
192 return _processor_count;
193 }
194 static void set_processor_count(int count) { _processor_count = count; }
195
196 // Returns the number of CPUs this process is currently allowed to run on.
197 // Note that on some OSes this can change dynamically.
198 static int active_processor_count();
199
200 // Bind processes to processors.
201 // This is a two step procedure:
202 // first you generate a distribution of processes to processors,
203 // then you bind processes according to that distribution.
204 // Compute a distribution for number of processes to processors.
205 // Stores the processor id's into the distribution array argument.
206 // Returns true if it worked, false if it didn't.
207 static bool distribute_processes(uint length, uint* distribution);
208 // Binds the current process to a processor.
209 // Returns true if it worked, false if it didn't.
210 static bool bind_to_processor(uint processor_id);
211
212 // Give a name to the current thread.
213 static void set_native_thread_name(const char *name);
214
215 // Interface for stack banging (predetect possible stack overflow for
216 // exception processing) There are guard pages, and above that shadow
217 // pages for stack overflow checking.
218 static bool uses_stack_guard_pages();
219 static bool allocate_stack_guard_pages();
220 static void bang_stack_shadow_pages();
221 static bool stack_shadow_pages_available(Thread *thread, methodHandle method);
222
223 // OS interface to Virtual Memory
224
225 // Return the default page size.
226 static int vm_page_size();
227
228 // Return the page size to use for a region of memory. The min_pages argument
229 // is a hint intended to limit fragmentation; it says the returned page size
230 // should be <= region_max_size / min_pages. Because min_pages is a hint,
231 // this routine may return a size larger than region_max_size / min_pages.
232 //
233 // The current implementation ignores min_pages if a larger page size is an
234 // exact multiple of both region_min_size and region_max_size. This allows
235 // larger pages to be used when doing so would not cause fragmentation; in
236 // particular, a single page can be used when region_min_size ==
237 // region_max_size == a supported page size.
238 static size_t page_size_for_region(size_t region_min_size,
239 size_t region_max_size,
240 uint min_pages);
241
242 // Methods for tracing page sizes returned by the above method; enabled by
243 // TracePageSizes. The region_{min,max}_size parameters should be the values
244 // passed to page_size_for_region() and page_size should be the result of that
245 // call. The (optional) base and size parameters should come from the
246 // ReservedSpace base() and size() methods.
247 static void trace_page_sizes(const char* str, const size_t* page_sizes,
248 int count) PRODUCT_RETURN;
249 static void trace_page_sizes(const char* str, const size_t region_min_size,
250 const size_t region_max_size,
251 const size_t page_size,
252 const char* base = NULL,
253 const size_t size = 0) PRODUCT_RETURN;
254
255 static int vm_allocation_granularity();
256 static char* reserve_memory(size_t bytes, char* addr = 0,
257 size_t alignment_hint = 0);
258 static char* reserve_memory_aligned(size_t bytes, size_t alignment);
259 static char* attempt_reserve_memory_at(size_t bytes, char* addr);
260 static void split_reserved_memory(char *base, size_t size,
261 size_t split, bool realloc);
262 static bool commit_memory(char* addr, size_t bytes, bool executable = false);
263 static bool commit_memory(char* addr, size_t size, size_t alignment_hint,
264 bool executable = false);
265 static bool uncommit_memory(char* addr, size_t bytes);
266 static bool release_memory(char* addr, size_t bytes);
267
268 enum ProtType { MEM_PROT_NONE, MEM_PROT_READ, MEM_PROT_RW, MEM_PROT_RWX };
269 static bool protect_memory(char* addr, size_t bytes, ProtType prot,
270 bool is_committed = true);
271
272 static bool guard_memory(char* addr, size_t bytes);
273 static bool unguard_memory(char* addr, size_t bytes);
274 static bool create_stack_guard_pages(char* addr, size_t bytes);
275 static bool pd_create_stack_guard_pages(char* addr, size_t bytes);
276 static bool remove_stack_guard_pages(char* addr, size_t bytes);
277
278 static char* map_memory(int fd, const char* file_name, size_t file_offset,
279 char *addr, size_t bytes, bool read_only = false,
280 bool allow_exec = false);
281 static char* remap_memory(int fd, const char* file_name, size_t file_offset,
282 char *addr, size_t bytes, bool read_only,
283 bool allow_exec);
284 static bool unmap_memory(char *addr, size_t bytes);
285 static void free_memory(char *addr, size_t bytes, size_t alignment_hint);
286 static void realign_memory(char *addr, size_t bytes, size_t alignment_hint);
287
288 // NUMA-specific interface
289 static bool numa_has_static_binding();
290 static bool numa_has_group_homing();
291 static void numa_make_local(char *addr, size_t bytes, int lgrp_hint);
292 static void numa_make_global(char *addr, size_t bytes);
293 static size_t numa_get_groups_num();
294 static size_t numa_get_leaf_groups(int *ids, size_t size);
295 static bool numa_topology_changed();
296 static int numa_get_group_id();
297
298 // Page manipulation
299 struct page_info {
300 size_t size;
301 int lgrp_id;
302 };
303 static bool get_page_info(char *start, page_info* info);
304 static char* scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found);
305
306 static char* non_memory_address_word();
307 // reserve, commit and pin the entire memory region
308 static char* reserve_memory_special(size_t size, char* addr = NULL,
309 bool executable = false);
310 static bool release_memory_special(char* addr, size_t bytes);
311 static void large_page_init();
312 static size_t large_page_size();
313 static bool can_commit_large_page_memory();
314 static bool can_execute_large_page_memory();
315
316 // OS interface to polling page
317 static address get_polling_page() { return _polling_page; }
318 static void set_polling_page(address page) { _polling_page = page; }
319 static bool is_poll_address(address addr) { return addr >= _polling_page && addr < (_polling_page + os::vm_page_size()); }
320 static void make_polling_page_unreadable();
321 static void make_polling_page_readable();
322
323 // Routines used to serialize the thread state without using membars
324 static void serialize_thread_states();
325
326 // Since we write to the serialize page from every thread, we
327 // want stores to be on unique cache lines whenever possible
328 // in order to minimize CPU cross talk. We pre-compute the
329 // amount to shift the thread* to make this offset unique to
330 // each thread.
331 static int get_serialize_page_shift_count() {
332 return SerializePageShiftCount;
333 }
334
335 static void set_serialize_page_mask(uintptr_t mask) {
336 _serialize_page_mask = mask;
337 }
338
339 static unsigned int get_serialize_page_mask() {
340 return _serialize_page_mask;
341 }
342
343 static void set_memory_serialize_page(address page);
344
345 static address get_memory_serialize_page() {
346 return (address)_mem_serialize_page;
347 }
348
349 static inline void write_memory_serialize_page(JavaThread *thread) {
350 uintptr_t page_offset = ((uintptr_t)thread >>
351 get_serialize_page_shift_count()) &
352 get_serialize_page_mask();
353 *(volatile int32_t *)((uintptr_t)_mem_serialize_page+page_offset) = 1;
354 }
355
356 static bool is_memory_serialize_page(JavaThread *thread, address addr) {
357 if (UseMembar) return false;
358 // Previously this function calculated the exact address of this
359 // thread's serialize page, and checked if the faulting address
360 // was equal. However, some platforms mask off faulting addresses
361 // to the page size, so now we just check that the address is
362 // within the page. This makes the thread argument unnecessary,
363 // but we retain the NULL check to preserve existing behaviour.
364 if (thread == NULL) return false;
365 address page = (address) _mem_serialize_page;
366 return addr >= page && addr < (page + os::vm_page_size());
367 }
368
369 static void block_on_serialize_page_trap();
370
371 // threads
372
373 enum ThreadType {
374 vm_thread,
375 cgc_thread, // Concurrent GC thread
376 pgc_thread, // Parallel GC thread
377 java_thread,
378 compiler_thread,
379 watcher_thread,
380 os_thread
381 };
382
383 static bool create_thread(Thread* thread,
384 ThreadType thr_type,
385 size_t stack_size = 0);
386 static bool create_main_thread(JavaThread* thread);
387 static bool create_attached_thread(JavaThread* thread);
388 static void pd_start_thread(Thread* thread);
389 static void start_thread(Thread* thread);
390
391 static void initialize_thread(Thread* thr);
392 static void free_thread(OSThread* osthread);
393
394 // thread id on Linux/64bit is 64bit, on Windows and Solaris, it's 32bit
395 static intx current_thread_id();
396 static int current_process_id();
397 static int sleep(Thread* thread, jlong ms, bool interruptable);
398 static int naked_sleep();
399 static void infinite_sleep(); // never returns, use with CAUTION
400 static void yield(); // Yields to all threads with same priority
401 enum YieldResult {
402 YIELD_SWITCHED = 1, // caller descheduled, other ready threads exist & ran
403 YIELD_NONEREADY = 0, // No other runnable/ready threads.
404 // platform-specific yield return immediately
405 YIELD_UNKNOWN = -1 // Unknown: platform doesn't support _SWITCHED or _NONEREADY
406 // YIELD_SWITCHED and YIELD_NONREADY imply the platform supports a "strong"
407 // yield that can be used in lieu of blocking.
408 } ;
409 static YieldResult NakedYield () ;
410 static void yield_all(int attempts = 0); // Yields to all other threads including lower priority
411 static void loop_breaker(int attempts); // called from within tight loops to possibly influence time-sharing
412 static OSReturn set_priority(Thread* thread, ThreadPriority priority);
413 static OSReturn get_priority(const Thread* const thread, ThreadPriority& priority);
414
415 static void interrupt(Thread* thread);
416 static bool is_interrupted(Thread* thread, bool clear_interrupted);
417
418 static int pd_self_suspend_thread(Thread* thread);
419
420 static ExtendedPC fetch_frame_from_context(void* ucVoid, intptr_t** sp, intptr_t** fp);
421 static frame fetch_frame_from_context(void* ucVoid);
422
423 static ExtendedPC get_thread_pc(Thread *thread);
424 static void breakpoint();
425
426 static address current_stack_pointer();
427 static address current_stack_base();
428 static size_t current_stack_size();
429
430 static void verify_stack_alignment() PRODUCT_RETURN;
431
432 static int message_box(const char* title, const char* message);
433 static char* do_you_want_to_debug(const char* message);
434
435 // run cmd in a separate process and return its exit code; or -1 on failures
436 static int fork_and_exec(char *cmd);
437
438 // Set file to send error reports.
439 static void set_error_file(const char *logfile);
440
441 // os::exit() is merged with vm_exit()
442 // static void exit(int num);
443
444 // Terminate the VM, but don't exit the process
445 static void shutdown();
446
447 // Terminate with an error. Default is to generate a core file on platforms
448 // that support such things. This calls shutdown() and then aborts.
449 static void abort(bool dump_core = true);
450
451 // Die immediately, no exit hook, no abort hook, no cleanup.
452 static void die();
453
454 // File i/o operations
455 static const int default_file_open_flags();
456 static int open(const char *path, int oflag, int mode);
457 static int close(int fd);
458 static jlong lseek(int fd, jlong offset, int whence);
459 static char* native_path(char *path);
460 static int ftruncate(int fd, jlong length);
461 static int fsync(int fd);
462 static int available(int fd, jlong *bytes);
463
464 //File i/o operations
465
466 static size_t read(int fd, void *buf, unsigned int nBytes);
467 static size_t restartable_read(int fd, void *buf, unsigned int nBytes);
468 static size_t write(int fd, const void *buf, unsigned int nBytes);
469
470 // Reading directories.
471 static DIR* opendir(const char* dirname);
472 static int readdir_buf_size(const char *path);
473 static struct dirent* readdir(DIR* dirp, dirent* dbuf);
474 static int closedir(DIR* dirp);
475
476 // Dynamic library extension
477 static const char* dll_file_extension();
478
479 static const char* get_temp_directory();
480 static const char* get_current_directory(char *buf, int buflen);
481
482 // Builds a platform-specific full library path given a ld path and lib name
483 // Returns true if buffer contains full path to existing file, false otherwise
484 static bool dll_build_name(char* buffer, size_t size,
485 const char* pathname, const char* fname);
486
487 // Symbol lookup, find nearest function name; basically it implements
488 // dladdr() for all platforms. Name of the nearest function is copied
489 // to buf. Distance from its base address is returned as offset.
490 // If function name is not found, buf[0] is set to '\0' and offset is
491 // set to -1.
492 static bool dll_address_to_function_name(address addr, char* buf,
493 int buflen, int* offset);
494
495 // Locate DLL/DSO. On success, full path of the library is copied to
496 // buf, and offset is set to be the distance between addr and the
497 // library's base address. On failure, buf[0] is set to '\0' and
498 // offset is set to -1.
499 static bool dll_address_to_library_name(address addr, char* buf,
500 int buflen, int* offset);
501
502 // Find out whether the pc is in the static code for jvm.dll/libjvm.so.
503 static bool address_is_in_vm(address addr);
504
505 // Loads .dll/.so and
506 // in case of error it checks if .dll/.so was built for the
507 // same architecture as Hotspot is running on
508 static void* dll_load(const char *name, char *ebuf, int ebuflen);
509
510 // lookup symbol in a shared library
511 static void* dll_lookup(void* handle, const char* name);
512
513 // Unload library
514 static void dll_unload(void *lib);
515
516 // Print out system information; they are called by fatal error handler.
517 // Output format may be different on different platforms.
518 static void print_os_info(outputStream* st);
519 static void print_os_info_brief(outputStream* st);
520 static void print_cpu_info(outputStream* st);
521 static void pd_print_cpu_info(outputStream* st);
522 static void print_memory_info(outputStream* st);
523 static void print_dll_info(outputStream* st);
524 static void print_environment_variables(outputStream* st, const char** env_list, char* buffer, int len);
525 static void print_context(outputStream* st, void* context);
526 static void print_register_info(outputStream* st, void* context);
527 static void print_siginfo(outputStream* st, void* siginfo);
528 static void print_signal_handlers(outputStream* st, char* buf, size_t buflen);
529 static void print_date_and_time(outputStream* st);
530
531 static void print_location(outputStream* st, intptr_t x, bool verbose = false);
532 static size_t lasterror(char *buf, size_t len);
533 static int get_last_error();
534
535 // Determines whether the calling process is being debugged by a user-mode debugger.
536 static bool is_debugger_attached();
537
538 // wait for a key press if PauseAtExit is set
539 static void wait_for_keypress_at_exit(void);
540
541 // The following two functions are used by fatal error handler to trace
542 // native (C) frames. They are not part of frame.hpp/frame.cpp because
543 // frame.hpp/cpp assume thread is JavaThread, and also because different
544 // OS/compiler may have different convention or provide different API to
545 // walk C frames.
546 //
547 // We don't attempt to become a debugger, so we only follow frames if that
548 // does not require a lookup in the unwind table, which is part of the binary
549 // file but may be unsafe to read after a fatal error. So on x86, we can
550 // only walk stack if %ebp is used as frame pointer; on ia64, it's not
551 // possible to walk C stack without having the unwind table.
552 static bool is_first_C_frame(frame *fr);
553 static frame get_sender_for_C_frame(frame *fr);
554
555 // return current frame. pc() and sp() are set to NULL on failure.
556 static frame current_frame();
557
558 static void print_hex_dump(outputStream* st, address start, address end, int unitsize);
559
560 // returns a string to describe the exception/signal;
561 // returns NULL if exception_code is not an OS exception/signal.
562 static const char* exception_name(int exception_code, char* buf, size_t buflen);
563
564 // Returns native Java library, loads if necessary
565 static void* native_java_library();
566
567 // Fills in path to jvm.dll/libjvm.so (used by the Disassembler)
568 static void jvm_path(char *buf, jint buflen);
569
570 // Returns true if we are running in a headless jre.
571 static bool is_headless_jre();
572
573 // JNI names
574 static void print_jni_name_prefix_on(outputStream* st, int args_size);
575 static void print_jni_name_suffix_on(outputStream* st, int args_size);
576
577 // File conventions
578 static const char* file_separator();
579 static const char* line_separator();
580 static const char* path_separator();
581
582 // Init os specific system properties values
583 static void init_system_properties_values();
584
585 // IO operations, non-JVM_ version.
586 static int stat(const char* path, struct stat* sbuf);
587 static bool dir_is_empty(const char* path);
588
589 // IO operations on binary files
590 static int create_binary_file(const char* path, bool rewrite_existing);
591 static jlong current_file_offset(int fd);
592 static jlong seek_to_file_offset(int fd, jlong offset);
593
594 // Thread Local Storage
595 static int allocate_thread_local_storage();
596 static void thread_local_storage_at_put(int index, void* value);
597 static void* thread_local_storage_at(int index);
598 static void free_thread_local_storage(int index);
599
600 // Stack walk
601 static address get_caller_pc(int n = 0);
602
603 // General allocation (must be MT-safe)
604 static void* malloc (size_t size, MEMFLAGS flags, address caller_pc = 0);
605 static void* realloc (void *memblock, size_t size, MEMFLAGS flags, address caller_pc = 0);
606 static void free (void *memblock, MEMFLAGS flags = mtNone);
607 static bool check_heap(bool force = false); // verify C heap integrity
608 static char* strdup(const char *, MEMFLAGS flags = mtInternal); // Like strdup
609
610 #ifndef PRODUCT
611 static julong num_mallocs; // # of calls to malloc/realloc
612 static julong alloc_bytes; // # of bytes allocated
613 static julong num_frees; // # of calls to free
614 static julong free_bytes; // # of bytes freed
615 #endif
616
617 // SocketInterface (ex HPI SocketInterface )
618 static int socket(int domain, int type, int protocol);
619 static int socket_close(int fd);
620 static int socket_shutdown(int fd, int howto);
621 static int recv(int fd, char* buf, size_t nBytes, uint flags);
622 static int send(int fd, char* buf, size_t nBytes, uint flags);
623 static int raw_send(int fd, char* buf, size_t nBytes, uint flags);
624 static int timeout(int fd, long timeout);
625 static int listen(int fd, int count);
626 static int connect(int fd, struct sockaddr* him, socklen_t len);
627 static int bind(int fd, struct sockaddr* him, socklen_t len);
628 static int accept(int fd, struct sockaddr* him, socklen_t* len);
629 static int recvfrom(int fd, char* buf, size_t nbytes, uint flags,
630 struct sockaddr* from, socklen_t* fromlen);
631 static int get_sock_name(int fd, struct sockaddr* him, socklen_t* len);
632 static int sendto(int fd, char* buf, size_t len, uint flags,
633 struct sockaddr* to, socklen_t tolen);
634 static int socket_available(int fd, jint* pbytes);
635
636 static int get_sock_opt(int fd, int level, int optname,
637 char* optval, socklen_t* optlen);
638 static int set_sock_opt(int fd, int level, int optname,
639 const char* optval, socklen_t optlen);
640 static int get_host_name(char* name, int namelen);
641
642 static struct hostent* get_host_by_name(char* name);
643
644 // Printing 64 bit integers
645 static const char* jlong_format_specifier();
646 static const char* julong_format_specifier();
647
648 // Support for signals (see JVM_RaiseSignal, JVM_RegisterSignal)
649 static void signal_init();
650 static void signal_init_pd();
651 static void signal_notify(int signal_number);
652 static void* signal(int signal_number, void* handler);
653 static void signal_raise(int signal_number);
654 static int signal_wait();
655 static int signal_lookup();
656 static void* user_handler();
657 static void terminate_signal_thread();
658 static int sigexitnum_pd();
659
660 // random number generation
661 static long random(); // return 32bit pseudorandom number
662 static void init_random(long initval); // initialize random sequence
663
664 // Structured OS Exception support
665 static void os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread);
666
667 // On Windows this will create an actual minidump, on Linux/Solaris it will simply check core dump limits
668 static void check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize);
669
670 // Get the default path to the core file
671 // Returns the length of the string
672 static int get_core_path(char* buffer, size_t bufferSize);
673
674 // JVMTI & JVM monitoring and management support
675 // The thread_cpu_time() and current_thread_cpu_time() are only
676 // supported if is_thread_cpu_time_supported() returns true.
677 // They are not supported on Solaris T1.
678
679 // Thread CPU Time - return the fast estimate on a platform
680 // On Solaris - call gethrvtime (fast) - user time only
681 // On Linux - fast clock_gettime where available - user+sys
682 // - otherwise: very slow /proc fs - user+sys
683 // On Windows - GetThreadTimes - user+sys
684 static jlong current_thread_cpu_time();
685 static jlong thread_cpu_time(Thread* t);
686
687 // Thread CPU Time with user_sys_cpu_time parameter.
688 //
689 // If user_sys_cpu_time is true, user+sys time is returned.
690 // Otherwise, only user time is returned
691 static jlong current_thread_cpu_time(bool user_sys_cpu_time);
692 static jlong thread_cpu_time(Thread* t, bool user_sys_cpu_time);
693
694 // Return a bunch of info about the timers.
695 // Note that the returned info for these two functions may be different
696 // on some platforms
697 static void current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr);
698 static void thread_cpu_time_info(jvmtiTimerInfo *info_ptr);
699
700 static bool is_thread_cpu_time_supported();
701
702 // System loadavg support. Returns -1 if load average cannot be obtained.
703 static int loadavg(double loadavg[], int nelem);
704
705 // Hook for os specific jvm options that we don't want to abort on seeing
706 static bool obsolete_option(const JavaVMOption *option);
707
708 // Read file line by line. If line is longer than bsize,
709 // rest of line is skipped. Returns number of bytes read or -1 on EOF
710 static int get_line_chars(int fd, char *buf, const size_t bsize);
711
712 // Extensions
713 #include "runtime/os_ext.hpp"
714
715 public:
716
717 // Platform dependent stuff
718 #ifdef TARGET_OS_FAMILY_linux
719 # include "os_linux.hpp"
720 # include "os_posix.hpp"
721 #endif
722 #ifdef TARGET_OS_FAMILY_solaris
723 # include "os_solaris.hpp"
724 # include "os_posix.hpp"
725 #endif
726 #ifdef TARGET_OS_FAMILY_windows
727 # include "os_windows.hpp"
728 #endif
729 #ifdef TARGET_OS_FAMILY_bsd
730 # include "os_posix.hpp"
731 # include "os_bsd.hpp"
732 #endif
733 #ifdef TARGET_OS_ARCH_linux_x86
734 # include "os_linux_x86.hpp"
735 #endif
736 #ifdef TARGET_OS_ARCH_linux_sparc
737 # include "os_linux_sparc.hpp"
738 #endif
739 #ifdef TARGET_OS_ARCH_linux_zero
740 # include "os_linux_zero.hpp"
741 #endif
742 #ifdef TARGET_OS_ARCH_solaris_x86
743 # include "os_solaris_x86.hpp"
744 #endif
745 #ifdef TARGET_OS_ARCH_solaris_sparc
746 # include "os_solaris_sparc.hpp"
747 #endif
748 #ifdef TARGET_OS_ARCH_windows_x86
749 # include "os_windows_x86.hpp"
750 #endif
751 #ifdef TARGET_OS_ARCH_linux_arm
752 # include "os_linux_arm.hpp"
753 #endif
754 #ifdef TARGET_OS_ARCH_linux_ppc
755 # include "os_linux_ppc.hpp"
756 #endif
757 #ifdef TARGET_OS_ARCH_bsd_x86
758 # include "os_bsd_x86.hpp"
759 #endif
760 #ifdef TARGET_OS_ARCH_bsd_zero
761 # include "os_bsd_zero.hpp"
762 #endif
763
764 public:
765 // debugging support (mostly used by debug.cpp but also fatal error handler)
766 static bool find(address pc, outputStream* st = tty); // OS specific function to make sense out of an address
767
768 static bool dont_yield(); // when true, JVM_Yield() is nop
769 static void print_statistics();
770
771 // Thread priority helpers (implemented in OS-specific part)
772 static OSReturn set_native_priority(Thread* thread, int native_prio);
773 static OSReturn get_native_priority(const Thread* const thread, int* priority_ptr);
774 static int java_to_os_priority[CriticalPriority + 1];
775 // Hint to the underlying OS that a task switch would not be good.
776 // Void return because it's a hint and can fail.
777 static void hint_no_preempt();
778
779 // Used at creation if requested by the diagnostic flag PauseAtStartup.
780 // Causes the VM to wait until an external stimulus has been applied
781 // (for Unix, that stimulus is a signal, for Windows, an external
782 // ResumeThread call)
783 static void pause();
784
785 protected:
786 static long _rand_seed; // seed for random number generator
787 static int _processor_count; // number of processors
788
789 static char* format_boot_path(const char* format_string,
790 const char* home,
791 int home_len,
792 char fileSep,
793 char pathSep);
794 static bool set_boot_path(char fileSep, char pathSep);
795 static char** split_path(const char* path, int* n);
796 };
797
798 // Note that "PAUSE" is almost always used with synchronization
799 // so arguably we should provide Atomic::SpinPause() instead
800 // of the global SpinPause() with C linkage.
801 // It'd also be eligible for inlining on many platforms.
802
803 extern "C" int SpinPause () ;
804 extern "C" int SafeFetch32 (int * adr, int errValue) ;
805 extern "C" intptr_t SafeFetchN (intptr_t * adr, intptr_t errValue) ;
806
807 #endif // SHARE_VM_RUNTIME_OS_HPP