Thu, 05 Sep 2013 11:04:39 -0700
Merge
1 /*
2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
25 #ifndef SHARE_VM_RUNTIME_OS_HPP
26 #define SHARE_VM_RUNTIME_OS_HPP
28 #include "jvmtifiles/jvmti.h"
29 #include "runtime/atomic.hpp"
30 #include "runtime/extendedPC.hpp"
31 #include "runtime/handles.hpp"
32 #include "utilities/top.hpp"
33 #ifdef TARGET_OS_FAMILY_linux
34 # include "jvm_linux.h"
35 # include <setjmp.h>
36 #endif
37 #ifdef TARGET_OS_FAMILY_solaris
38 # include "jvm_solaris.h"
39 # include <setjmp.h>
40 #endif
41 #ifdef TARGET_OS_FAMILY_windows
42 # include "jvm_windows.h"
43 #endif
44 #ifdef TARGET_OS_FAMILY_aix
45 # include "jvm_aix.h"
46 # include <setjmp.h>
47 #endif
48 #ifdef TARGET_OS_FAMILY_bsd
49 # include "jvm_bsd.h"
50 # include <setjmp.h>
51 #endif
53 class AgentLibrary;
55 // os defines the interface to operating system; this includes traditional
56 // OS services (time, I/O) as well as other functionality with system-
57 // dependent code.
59 typedef void (*dll_func)(...);
61 class Thread;
62 class JavaThread;
63 class Event;
64 class DLL;
65 class FileHandle;
66 template<class E> class GrowableArray;
68 // %%%%% Moved ThreadState, START_FN, OSThread to new osThread.hpp. -- Rose
70 // Platform-independent error return values from OS functions
71 enum OSReturn {
72 OS_OK = 0, // Operation was successful
73 OS_ERR = -1, // Operation failed
74 OS_INTRPT = -2, // Operation was interrupted
75 OS_TIMEOUT = -3, // Operation timed out
76 OS_NOMEM = -5, // Operation failed for lack of memory
77 OS_NORESOURCE = -6 // Operation failed for lack of nonmemory resource
78 };
80 enum ThreadPriority { // JLS 20.20.1-3
81 NoPriority = -1, // Initial non-priority value
82 MinPriority = 1, // Minimum priority
83 NormPriority = 5, // Normal (non-daemon) priority
84 NearMaxPriority = 9, // High priority, used for VMThread
85 MaxPriority = 10, // Highest priority, used for WatcherThread
86 // ensures that VMThread doesn't starve profiler
87 CriticalPriority = 11 // Critical thread priority
88 };
90 // Executable parameter flag for os::commit_memory() and
91 // os::commit_memory_or_exit().
92 const bool ExecMem = true;
94 // Typedef for structured exception handling support
95 typedef void (*java_call_t)(JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread);
97 class os: AllStatic {
98 public:
99 enum { page_sizes_max = 9 }; // Size of _page_sizes array (8 plus a sentinel)
101 private:
102 static OSThread* _starting_thread;
103 static address _polling_page;
104 static volatile int32_t * _mem_serialize_page;
105 static uintptr_t _serialize_page_mask;
106 public:
107 static size_t _page_sizes[page_sizes_max];
109 private:
110 static void init_page_sizes(size_t default_page_size) {
111 _page_sizes[0] = default_page_size;
112 _page_sizes[1] = 0; // sentinel
113 }
115 static char* pd_reserve_memory(size_t bytes, char* addr = 0,
116 size_t alignment_hint = 0);
117 static char* pd_attempt_reserve_memory_at(size_t bytes, char* addr);
118 static void pd_split_reserved_memory(char *base, size_t size,
119 size_t split, bool realloc);
120 static bool pd_commit_memory(char* addr, size_t bytes, bool executable);
121 static bool pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
122 bool executable);
123 // Same as pd_commit_memory() that either succeeds or calls
124 // vm_exit_out_of_memory() with the specified mesg.
125 static void pd_commit_memory_or_exit(char* addr, size_t bytes,
126 bool executable, const char* mesg);
127 static void pd_commit_memory_or_exit(char* addr, size_t size,
128 size_t alignment_hint,
129 bool executable, const char* mesg);
130 static bool pd_uncommit_memory(char* addr, size_t bytes);
131 static bool pd_release_memory(char* addr, size_t bytes);
133 static char* pd_map_memory(int fd, const char* file_name, size_t file_offset,
134 char *addr, size_t bytes, bool read_only = false,
135 bool allow_exec = false);
136 static char* pd_remap_memory(int fd, const char* file_name, size_t file_offset,
137 char *addr, size_t bytes, bool read_only,
138 bool allow_exec);
139 static bool pd_unmap_memory(char *addr, size_t bytes);
140 static void pd_free_memory(char *addr, size_t bytes, size_t alignment_hint);
141 static void pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint);
144 public:
145 static void init(void); // Called before command line parsing
146 static jint init_2(void); // Called after command line parsing
147 static void init_globals(void) { // Called from init_globals() in init.cpp
148 init_globals_ext();
149 }
150 static void init_3(void); // Called at the end of vm init
152 // File names are case-insensitive on windows only
153 // Override me as needed
154 static int file_name_strcmp(const char* s1, const char* s2);
156 static bool getenv(const char* name, char* buffer, int len);
157 static bool have_special_privileges();
159 static jlong javaTimeMillis();
160 static jlong javaTimeNanos();
161 static void javaTimeNanos_info(jvmtiTimerInfo *info_ptr);
162 static void run_periodic_checks();
165 // Returns the elapsed time in seconds since the vm started.
166 static double elapsedTime();
168 // Returns real time in seconds since an arbitrary point
169 // in the past.
170 static bool getTimesSecs(double* process_real_time,
171 double* process_user_time,
172 double* process_system_time);
174 // Interface to the performance counter
175 static jlong elapsed_counter();
176 static jlong elapsed_frequency();
178 // The "virtual time" of a thread is the amount of time a thread has
179 // actually run. The first function indicates whether the OS supports
180 // this functionality for the current thread, and if so:
181 // * the second enables vtime tracking (if that is required).
182 // * the third tells whether vtime is enabled.
183 // * the fourth returns the elapsed virtual time for the current
184 // thread.
185 static bool supports_vtime();
186 static bool enable_vtime();
187 static bool vtime_enabled();
188 static double elapsedVTime();
190 // Return current local time in a string (YYYY-MM-DD HH:MM:SS).
191 // It is MT safe, but not async-safe, as reading time zone
192 // information may require a lock on some platforms.
193 static char* local_time_string(char *buf, size_t buflen);
194 static struct tm* localtime_pd (const time_t* clock, struct tm* res);
195 // Fill in buffer with current local time as an ISO-8601 string.
196 // E.g., YYYY-MM-DDThh:mm:ss.mmm+zzzz.
197 // Returns buffer, or NULL if it failed.
198 static char* iso8601_time(char* buffer, size_t buffer_length);
200 // Interface for detecting multiprocessor system
201 static inline bool is_MP() {
202 assert(_processor_count > 0, "invalid processor count");
203 return _processor_count > 1 || AssumeMP;
204 }
205 static julong available_memory();
206 static julong physical_memory();
207 static bool has_allocatable_memory_limit(julong* limit);
208 static bool is_server_class_machine();
210 // number of CPUs
211 static int processor_count() {
212 return _processor_count;
213 }
214 static void set_processor_count(int count) { _processor_count = count; }
216 // Returns the number of CPUs this process is currently allowed to run on.
217 // Note that on some OSes this can change dynamically.
218 static int active_processor_count();
220 // Bind processes to processors.
221 // This is a two step procedure:
222 // first you generate a distribution of processes to processors,
223 // then you bind processes according to that distribution.
224 // Compute a distribution for number of processes to processors.
225 // Stores the processor id's into the distribution array argument.
226 // Returns true if it worked, false if it didn't.
227 static bool distribute_processes(uint length, uint* distribution);
228 // Binds the current process to a processor.
229 // Returns true if it worked, false if it didn't.
230 static bool bind_to_processor(uint processor_id);
232 // Give a name to the current thread.
233 static void set_native_thread_name(const char *name);
235 // Interface for stack banging (predetect possible stack overflow for
236 // exception processing) There are guard pages, and above that shadow
237 // pages for stack overflow checking.
238 static bool uses_stack_guard_pages();
239 static bool allocate_stack_guard_pages();
240 static void bang_stack_shadow_pages();
241 static bool stack_shadow_pages_available(Thread *thread, methodHandle method);
243 // OS interface to Virtual Memory
245 // Return the default page size.
246 static int vm_page_size();
248 // Return the page size to use for a region of memory. The min_pages argument
249 // is a hint intended to limit fragmentation; it says the returned page size
250 // should be <= region_max_size / min_pages. Because min_pages is a hint,
251 // this routine may return a size larger than region_max_size / min_pages.
252 //
253 // The current implementation ignores min_pages if a larger page size is an
254 // exact multiple of both region_min_size and region_max_size. This allows
255 // larger pages to be used when doing so would not cause fragmentation; in
256 // particular, a single page can be used when region_min_size ==
257 // region_max_size == a supported page size.
258 static size_t page_size_for_region(size_t region_min_size,
259 size_t region_max_size,
260 uint min_pages);
262 // Methods for tracing page sizes returned by the above method; enabled by
263 // TracePageSizes. The region_{min,max}_size parameters should be the values
264 // passed to page_size_for_region() and page_size should be the result of that
265 // call. The (optional) base and size parameters should come from the
266 // ReservedSpace base() and size() methods.
267 static void trace_page_sizes(const char* str, const size_t* page_sizes,
268 int count) PRODUCT_RETURN;
269 static void trace_page_sizes(const char* str, const size_t region_min_size,
270 const size_t region_max_size,
271 const size_t page_size,
272 const char* base = NULL,
273 const size_t size = 0) PRODUCT_RETURN;
275 static int vm_allocation_granularity();
276 static char* reserve_memory(size_t bytes, char* addr = 0,
277 size_t alignment_hint = 0);
278 static char* reserve_memory(size_t bytes, char* addr,
279 size_t alignment_hint, MEMFLAGS flags);
280 static char* reserve_memory_aligned(size_t size, size_t alignment);
281 static char* attempt_reserve_memory_at(size_t bytes, char* addr);
282 static void split_reserved_memory(char *base, size_t size,
283 size_t split, bool realloc);
284 static bool commit_memory(char* addr, size_t bytes, bool executable);
285 static bool commit_memory(char* addr, size_t size, size_t alignment_hint,
286 bool executable);
287 // Same as commit_memory() that either succeeds or calls
288 // vm_exit_out_of_memory() with the specified mesg.
289 static void commit_memory_or_exit(char* addr, size_t bytes,
290 bool executable, const char* mesg);
291 static void commit_memory_or_exit(char* addr, size_t size,
292 size_t alignment_hint,
293 bool executable, const char* mesg);
294 static bool uncommit_memory(char* addr, size_t bytes);
295 static bool release_memory(char* addr, size_t bytes);
297 enum ProtType { MEM_PROT_NONE, MEM_PROT_READ, MEM_PROT_RW, MEM_PROT_RWX };
298 static bool protect_memory(char* addr, size_t bytes, ProtType prot,
299 bool is_committed = true);
301 static bool guard_memory(char* addr, size_t bytes);
302 static bool unguard_memory(char* addr, size_t bytes);
303 static bool create_stack_guard_pages(char* addr, size_t bytes);
304 static bool pd_create_stack_guard_pages(char* addr, size_t bytes);
305 static bool remove_stack_guard_pages(char* addr, size_t bytes);
307 static char* map_memory(int fd, const char* file_name, size_t file_offset,
308 char *addr, size_t bytes, bool read_only = false,
309 bool allow_exec = false);
310 static char* remap_memory(int fd, const char* file_name, size_t file_offset,
311 char *addr, size_t bytes, bool read_only,
312 bool allow_exec);
313 static bool unmap_memory(char *addr, size_t bytes);
314 static void free_memory(char *addr, size_t bytes, size_t alignment_hint);
315 static void realign_memory(char *addr, size_t bytes, size_t alignment_hint);
317 // NUMA-specific interface
318 static bool numa_has_static_binding();
319 static bool numa_has_group_homing();
320 static void numa_make_local(char *addr, size_t bytes, int lgrp_hint);
321 static void numa_make_global(char *addr, size_t bytes);
322 static size_t numa_get_groups_num();
323 static size_t numa_get_leaf_groups(int *ids, size_t size);
324 static bool numa_topology_changed();
325 static int numa_get_group_id();
327 // Page manipulation
328 struct page_info {
329 size_t size;
330 int lgrp_id;
331 };
332 static bool get_page_info(char *start, page_info* info);
333 static char* scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found);
335 static char* non_memory_address_word();
336 // reserve, commit and pin the entire memory region
337 static char* reserve_memory_special(size_t size, size_t alignment,
338 char* addr, bool executable);
339 static bool release_memory_special(char* addr, size_t bytes);
340 static void large_page_init();
341 static size_t large_page_size();
342 static bool can_commit_large_page_memory();
343 static bool can_execute_large_page_memory();
345 // OS interface to polling page
346 static address get_polling_page() { return _polling_page; }
347 static void set_polling_page(address page) { _polling_page = page; }
348 static bool is_poll_address(address addr) { return addr >= _polling_page && addr < (_polling_page + os::vm_page_size()); }
349 static void make_polling_page_unreadable();
350 static void make_polling_page_readable();
352 // Routines used to serialize the thread state without using membars
353 static void serialize_thread_states();
355 // Since we write to the serialize page from every thread, we
356 // want stores to be on unique cache lines whenever possible
357 // in order to minimize CPU cross talk. We pre-compute the
358 // amount to shift the thread* to make this offset unique to
359 // each thread.
360 static int get_serialize_page_shift_count() {
361 return SerializePageShiftCount;
362 }
364 static void set_serialize_page_mask(uintptr_t mask) {
365 _serialize_page_mask = mask;
366 }
368 static unsigned int get_serialize_page_mask() {
369 return _serialize_page_mask;
370 }
372 static void set_memory_serialize_page(address page);
374 static address get_memory_serialize_page() {
375 return (address)_mem_serialize_page;
376 }
378 static inline void write_memory_serialize_page(JavaThread *thread) {
379 uintptr_t page_offset = ((uintptr_t)thread >>
380 get_serialize_page_shift_count()) &
381 get_serialize_page_mask();
382 *(volatile int32_t *)((uintptr_t)_mem_serialize_page+page_offset) = 1;
383 }
385 static bool is_memory_serialize_page(JavaThread *thread, address addr) {
386 if (UseMembar) return false;
387 // Previously this function calculated the exact address of this
388 // thread's serialize page, and checked if the faulting address
389 // was equal. However, some platforms mask off faulting addresses
390 // to the page size, so now we just check that the address is
391 // within the page. This makes the thread argument unnecessary,
392 // but we retain the NULL check to preserve existing behaviour.
393 if (thread == NULL) return false;
394 address page = (address) _mem_serialize_page;
395 return addr >= page && addr < (page + os::vm_page_size());
396 }
398 static void block_on_serialize_page_trap();
400 // threads
402 enum ThreadType {
403 vm_thread,
404 cgc_thread, // Concurrent GC thread
405 pgc_thread, // Parallel GC thread
406 java_thread,
407 compiler_thread,
408 watcher_thread,
409 os_thread
410 };
412 static bool create_thread(Thread* thread,
413 ThreadType thr_type,
414 size_t stack_size = 0);
415 static bool create_main_thread(JavaThread* thread);
416 static bool create_attached_thread(JavaThread* thread);
417 static void pd_start_thread(Thread* thread);
418 static void start_thread(Thread* thread);
420 static void initialize_thread(Thread* thr);
421 static void free_thread(OSThread* osthread);
423 // thread id on Linux/64bit is 64bit, on Windows and Solaris, it's 32bit
424 static intx current_thread_id();
425 static int current_process_id();
426 static int sleep(Thread* thread, jlong ms, bool interruptable);
427 static int naked_sleep();
428 static void infinite_sleep(); // never returns, use with CAUTION
429 static void yield(); // Yields to all threads with same priority
430 enum YieldResult {
431 YIELD_SWITCHED = 1, // caller descheduled, other ready threads exist & ran
432 YIELD_NONEREADY = 0, // No other runnable/ready threads.
433 // platform-specific yield return immediately
434 YIELD_UNKNOWN = -1 // Unknown: platform doesn't support _SWITCHED or _NONEREADY
435 // YIELD_SWITCHED and YIELD_NONREADY imply the platform supports a "strong"
436 // yield that can be used in lieu of blocking.
437 } ;
438 static YieldResult NakedYield () ;
439 static void yield_all(int attempts = 0); // Yields to all other threads including lower priority
440 static void loop_breaker(int attempts); // called from within tight loops to possibly influence time-sharing
441 static OSReturn set_priority(Thread* thread, ThreadPriority priority);
442 static OSReturn get_priority(const Thread* const thread, ThreadPriority& priority);
444 static void interrupt(Thread* thread);
445 static bool is_interrupted(Thread* thread, bool clear_interrupted);
447 static int pd_self_suspend_thread(Thread* thread);
449 static ExtendedPC fetch_frame_from_context(void* ucVoid, intptr_t** sp, intptr_t** fp);
450 static frame fetch_frame_from_context(void* ucVoid);
452 static ExtendedPC get_thread_pc(Thread *thread);
453 static void breakpoint();
455 static address current_stack_pointer();
456 static address current_stack_base();
457 static size_t current_stack_size();
459 static void verify_stack_alignment() PRODUCT_RETURN;
461 static int message_box(const char* title, const char* message);
462 static char* do_you_want_to_debug(const char* message);
464 // run cmd in a separate process and return its exit code; or -1 on failures
465 static int fork_and_exec(char *cmd);
467 // Set file to send error reports.
468 static void set_error_file(const char *logfile);
470 // os::exit() is merged with vm_exit()
471 // static void exit(int num);
473 // Terminate the VM, but don't exit the process
474 static void shutdown();
476 // Terminate with an error. Default is to generate a core file on platforms
477 // that support such things. This calls shutdown() and then aborts.
478 static void abort(bool dump_core = true);
480 // Die immediately, no exit hook, no abort hook, no cleanup.
481 static void die();
483 // File i/o operations
484 static const int default_file_open_flags();
485 static int open(const char *path, int oflag, int mode);
486 static FILE* open(int fd, const char* mode);
487 static int close(int fd);
488 static jlong lseek(int fd, jlong offset, int whence);
489 static char* native_path(char *path);
490 static int ftruncate(int fd, jlong length);
491 static int fsync(int fd);
492 static int available(int fd, jlong *bytes);
494 //File i/o operations
496 static size_t read(int fd, void *buf, unsigned int nBytes);
497 static size_t restartable_read(int fd, void *buf, unsigned int nBytes);
498 static size_t write(int fd, const void *buf, unsigned int nBytes);
500 // Reading directories.
501 static DIR* opendir(const char* dirname);
502 static int readdir_buf_size(const char *path);
503 static struct dirent* readdir(DIR* dirp, dirent* dbuf);
504 static int closedir(DIR* dirp);
506 // Dynamic library extension
507 static const char* dll_file_extension();
509 static const char* get_temp_directory();
510 static const char* get_current_directory(char *buf, size_t buflen);
512 // Builds a platform-specific full library path given a ld path and lib name
513 // Returns true if buffer contains full path to existing file, false otherwise
514 static bool dll_build_name(char* buffer, size_t size,
515 const char* pathname, const char* fname);
517 // Symbol lookup, find nearest function name; basically it implements
518 // dladdr() for all platforms. Name of the nearest function is copied
519 // to buf. Distance from its base address is optionally returned as offset.
520 // If function name is not found, buf[0] is set to '\0' and offset is
521 // set to -1 (if offset is non-NULL).
522 static bool dll_address_to_function_name(address addr, char* buf,
523 int buflen, int* offset);
525 // Locate DLL/DSO. On success, full path of the library is copied to
526 // buf, and offset is optionally set to be the distance between addr
527 // and the library's base address. On failure, buf[0] is set to '\0'
528 // and offset is set to -1 (if offset is non-NULL).
529 static bool dll_address_to_library_name(address addr, char* buf,
530 int buflen, int* offset);
532 // Find out whether the pc is in the static code for jvm.dll/libjvm.so.
533 static bool address_is_in_vm(address addr);
535 // Loads .dll/.so and
536 // in case of error it checks if .dll/.so was built for the
537 // same architecture as Hotspot is running on
538 static void* dll_load(const char *name, char *ebuf, int ebuflen);
540 // lookup symbol in a shared library
541 static void* dll_lookup(void* handle, const char* name);
543 // Unload library
544 static void dll_unload(void *lib);
546 // Return the handle of this process
547 static void* get_default_process_handle();
549 // Check for static linked agent library
550 static bool find_builtin_agent(AgentLibrary *agent_lib, const char *syms[],
551 size_t syms_len);
553 // Find agent entry point
554 static void *find_agent_function(AgentLibrary *agent_lib, bool check_lib,
555 const char *syms[], size_t syms_len);
557 // Print out system information; they are called by fatal error handler.
558 // Output format may be different on different platforms.
559 static void print_os_info(outputStream* st);
560 static void print_os_info_brief(outputStream* st);
561 static void print_cpu_info(outputStream* st);
562 static void pd_print_cpu_info(outputStream* st);
563 static void print_memory_info(outputStream* st);
564 static void print_dll_info(outputStream* st);
565 static void print_environment_variables(outputStream* st, const char** env_list, char* buffer, int len);
566 static void print_context(outputStream* st, void* context);
567 static void print_register_info(outputStream* st, void* context);
568 static void print_siginfo(outputStream* st, void* siginfo);
569 static void print_signal_handlers(outputStream* st, char* buf, size_t buflen);
570 static void print_date_and_time(outputStream* st);
572 static void print_location(outputStream* st, intptr_t x, bool verbose = false);
573 static size_t lasterror(char *buf, size_t len);
574 static int get_last_error();
576 // Determines whether the calling process is being debugged by a user-mode debugger.
577 static bool is_debugger_attached();
579 // wait for a key press if PauseAtExit is set
580 static void wait_for_keypress_at_exit(void);
582 // The following two functions are used by fatal error handler to trace
583 // native (C) frames. They are not part of frame.hpp/frame.cpp because
584 // frame.hpp/cpp assume thread is JavaThread, and also because different
585 // OS/compiler may have different convention or provide different API to
586 // walk C frames.
587 //
588 // We don't attempt to become a debugger, so we only follow frames if that
589 // does not require a lookup in the unwind table, which is part of the binary
590 // file but may be unsafe to read after a fatal error. So on x86, we can
591 // only walk stack if %ebp is used as frame pointer; on ia64, it's not
592 // possible to walk C stack without having the unwind table.
593 static bool is_first_C_frame(frame *fr);
594 static frame get_sender_for_C_frame(frame *fr);
596 // return current frame. pc() and sp() are set to NULL on failure.
597 static frame current_frame();
599 static void print_hex_dump(outputStream* st, address start, address end, int unitsize);
601 // returns a string to describe the exception/signal;
602 // returns NULL if exception_code is not an OS exception/signal.
603 static const char* exception_name(int exception_code, char* buf, size_t buflen);
605 // Returns native Java library, loads if necessary
606 static void* native_java_library();
608 // Fills in path to jvm.dll/libjvm.so (used by the Disassembler)
609 static void jvm_path(char *buf, jint buflen);
611 // Returns true if we are running in a headless jre.
612 static bool is_headless_jre();
614 // JNI names
615 static void print_jni_name_prefix_on(outputStream* st, int args_size);
616 static void print_jni_name_suffix_on(outputStream* st, int args_size);
618 // File conventions
619 static const char* file_separator();
620 static const char* line_separator();
621 static const char* path_separator();
623 // Init os specific system properties values
624 static void init_system_properties_values();
626 // IO operations, non-JVM_ version.
627 static int stat(const char* path, struct stat* sbuf);
628 static bool dir_is_empty(const char* path);
630 // IO operations on binary files
631 static int create_binary_file(const char* path, bool rewrite_existing);
632 static jlong current_file_offset(int fd);
633 static jlong seek_to_file_offset(int fd, jlong offset);
635 // Thread Local Storage
636 static int allocate_thread_local_storage();
637 static void thread_local_storage_at_put(int index, void* value);
638 static void* thread_local_storage_at(int index);
639 static void free_thread_local_storage(int index);
641 // Stack walk
642 static address get_caller_pc(int n = 0);
644 // General allocation (must be MT-safe)
645 static void* malloc (size_t size, MEMFLAGS flags, address caller_pc = 0);
646 static void* realloc (void *memblock, size_t size, MEMFLAGS flags, address caller_pc = 0);
647 static void free (void *memblock, MEMFLAGS flags = mtNone);
648 static bool check_heap(bool force = false); // verify C heap integrity
649 static char* strdup(const char *, MEMFLAGS flags = mtInternal); // Like strdup
651 #ifndef PRODUCT
652 static julong num_mallocs; // # of calls to malloc/realloc
653 static julong alloc_bytes; // # of bytes allocated
654 static julong num_frees; // # of calls to free
655 static julong free_bytes; // # of bytes freed
656 #endif
658 // SocketInterface (ex HPI SocketInterface )
659 static int socket(int domain, int type, int protocol);
660 static int socket_close(int fd);
661 static int socket_shutdown(int fd, int howto);
662 static int recv(int fd, char* buf, size_t nBytes, uint flags);
663 static int send(int fd, char* buf, size_t nBytes, uint flags);
664 static int raw_send(int fd, char* buf, size_t nBytes, uint flags);
665 static int timeout(int fd, long timeout);
666 static int listen(int fd, int count);
667 static int connect(int fd, struct sockaddr* him, socklen_t len);
668 static int bind(int fd, struct sockaddr* him, socklen_t len);
669 static int accept(int fd, struct sockaddr* him, socklen_t* len);
670 static int recvfrom(int fd, char* buf, size_t nbytes, uint flags,
671 struct sockaddr* from, socklen_t* fromlen);
672 static int get_sock_name(int fd, struct sockaddr* him, socklen_t* len);
673 static int sendto(int fd, char* buf, size_t len, uint flags,
674 struct sockaddr* to, socklen_t tolen);
675 static int socket_available(int fd, jint* pbytes);
677 static int get_sock_opt(int fd, int level, int optname,
678 char* optval, socklen_t* optlen);
679 static int set_sock_opt(int fd, int level, int optname,
680 const char* optval, socklen_t optlen);
681 static int get_host_name(char* name, int namelen);
683 static struct hostent* get_host_by_name(char* name);
685 // Support for signals (see JVM_RaiseSignal, JVM_RegisterSignal)
686 static void signal_init();
687 static void signal_init_pd();
688 static void signal_notify(int signal_number);
689 static void* signal(int signal_number, void* handler);
690 static void signal_raise(int signal_number);
691 static int signal_wait();
692 static int signal_lookup();
693 static void* user_handler();
694 static void terminate_signal_thread();
695 static int sigexitnum_pd();
697 // random number generation
698 static long random(); // return 32bit pseudorandom number
699 static void init_random(long initval); // initialize random sequence
701 // Structured OS Exception support
702 static void os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread);
704 // On Windows this will create an actual minidump, on Linux/Solaris it will simply check core dump limits
705 static void check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize);
707 // Get the default path to the core file
708 // Returns the length of the string
709 static int get_core_path(char* buffer, size_t bufferSize);
711 // JVMTI & JVM monitoring and management support
712 // The thread_cpu_time() and current_thread_cpu_time() are only
713 // supported if is_thread_cpu_time_supported() returns true.
714 // They are not supported on Solaris T1.
716 // Thread CPU Time - return the fast estimate on a platform
717 // On Solaris - call gethrvtime (fast) - user time only
718 // On Linux - fast clock_gettime where available - user+sys
719 // - otherwise: very slow /proc fs - user+sys
720 // On Windows - GetThreadTimes - user+sys
721 static jlong current_thread_cpu_time();
722 static jlong thread_cpu_time(Thread* t);
724 // Thread CPU Time with user_sys_cpu_time parameter.
725 //
726 // If user_sys_cpu_time is true, user+sys time is returned.
727 // Otherwise, only user time is returned
728 static jlong current_thread_cpu_time(bool user_sys_cpu_time);
729 static jlong thread_cpu_time(Thread* t, bool user_sys_cpu_time);
731 // Return a bunch of info about the timers.
732 // Note that the returned info for these two functions may be different
733 // on some platforms
734 static void current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr);
735 static void thread_cpu_time_info(jvmtiTimerInfo *info_ptr);
737 static bool is_thread_cpu_time_supported();
739 // System loadavg support. Returns -1 if load average cannot be obtained.
740 static int loadavg(double loadavg[], int nelem);
742 // Hook for os specific jvm options that we don't want to abort on seeing
743 static bool obsolete_option(const JavaVMOption *option);
745 // Read file line by line. If line is longer than bsize,
746 // rest of line is skipped. Returns number of bytes read or -1 on EOF
747 static int get_line_chars(int fd, char *buf, const size_t bsize);
749 // Extensions
750 #include "runtime/os_ext.hpp"
752 public:
753 class CrashProtectionCallback : public StackObj {
754 public:
755 virtual void call() = 0;
756 };
758 // Platform dependent stuff
759 #ifdef TARGET_OS_FAMILY_linux
760 # include "os_linux.hpp"
761 # include "os_posix.hpp"
762 #endif
763 #ifdef TARGET_OS_FAMILY_solaris
764 # include "os_solaris.hpp"
765 # include "os_posix.hpp"
766 #endif
767 #ifdef TARGET_OS_FAMILY_windows
768 # include "os_windows.hpp"
769 #endif
770 #ifdef TARGET_OS_FAMILY_aix
771 # include "os_aix.hpp"
772 # include "os_posix.hpp"
773 #endif
774 #ifdef TARGET_OS_FAMILY_bsd
775 # include "os_posix.hpp"
776 # include "os_bsd.hpp"
777 #endif
778 #ifdef TARGET_OS_ARCH_linux_x86
779 # include "os_linux_x86.hpp"
780 #endif
781 #ifdef TARGET_OS_ARCH_linux_sparc
782 # include "os_linux_sparc.hpp"
783 #endif
784 #ifdef TARGET_OS_ARCH_linux_zero
785 # include "os_linux_zero.hpp"
786 #endif
787 #ifdef TARGET_OS_ARCH_solaris_x86
788 # include "os_solaris_x86.hpp"
789 #endif
790 #ifdef TARGET_OS_ARCH_solaris_sparc
791 # include "os_solaris_sparc.hpp"
792 #endif
793 #ifdef TARGET_OS_ARCH_windows_x86
794 # include "os_windows_x86.hpp"
795 #endif
796 #ifdef TARGET_OS_ARCH_linux_arm
797 # include "os_linux_arm.hpp"
798 #endif
799 #ifdef TARGET_OS_ARCH_linux_ppc
800 # include "os_linux_ppc.hpp"
801 #endif
802 #ifdef TARGET_OS_ARCH_aix_ppc
803 # include "os_aix_ppc.hpp"
804 #endif
805 #ifdef TARGET_OS_ARCH_bsd_x86
806 # include "os_bsd_x86.hpp"
807 #endif
808 #ifdef TARGET_OS_ARCH_bsd_zero
809 # include "os_bsd_zero.hpp"
810 #endif
812 public:
813 // debugging support (mostly used by debug.cpp but also fatal error handler)
814 static bool find(address pc, outputStream* st = tty); // OS specific function to make sense out of an address
816 static bool dont_yield(); // when true, JVM_Yield() is nop
817 static void print_statistics();
819 // Thread priority helpers (implemented in OS-specific part)
820 static OSReturn set_native_priority(Thread* thread, int native_prio);
821 static OSReturn get_native_priority(const Thread* const thread, int* priority_ptr);
822 static int java_to_os_priority[CriticalPriority + 1];
823 // Hint to the underlying OS that a task switch would not be good.
824 // Void return because it's a hint and can fail.
825 static void hint_no_preempt();
827 // Used at creation if requested by the diagnostic flag PauseAtStartup.
828 // Causes the VM to wait until an external stimulus has been applied
829 // (for Unix, that stimulus is a signal, for Windows, an external
830 // ResumeThread call)
831 static void pause();
833 // Builds a platform dependent Agent_OnLoad_<libname> function name
834 // which is used to find statically linked in agents.
835 static char* build_agent_function_name(const char *sym, const char *cname,
836 bool is_absolute_path);
838 class SuspendedThreadTaskContext {
839 public:
840 SuspendedThreadTaskContext(Thread* thread, void *ucontext) : _thread(thread), _ucontext(ucontext) {}
841 Thread* thread() const { return _thread; }
842 void* ucontext() const { return _ucontext; }
843 private:
844 Thread* _thread;
845 void* _ucontext;
846 };
848 class SuspendedThreadTask {
849 public:
850 SuspendedThreadTask(Thread* thread) : _thread(thread), _done(false) {}
851 virtual ~SuspendedThreadTask() {}
852 void run();
853 bool is_done() { return _done; }
854 virtual void do_task(const SuspendedThreadTaskContext& context) = 0;
855 protected:
856 private:
857 void internal_do_task();
858 Thread* _thread;
859 bool _done;
860 };
862 #ifndef TARGET_OS_FAMILY_windows
863 // Suspend/resume support
864 // Protocol:
865 //
866 // a thread starts in SR_RUNNING
867 //
868 // SR_RUNNING can go to
869 // * SR_SUSPEND_REQUEST when the WatcherThread wants to suspend it
870 // SR_SUSPEND_REQUEST can go to
871 // * SR_RUNNING if WatcherThread decides it waited for SR_SUSPENDED too long (timeout)
872 // * SR_SUSPENDED if the stopped thread receives the signal and switches state
873 // SR_SUSPENDED can go to
874 // * SR_WAKEUP_REQUEST when the WatcherThread has done the work and wants to resume
875 // SR_WAKEUP_REQUEST can go to
876 // * SR_RUNNING when the stopped thread receives the signal
877 // * SR_WAKEUP_REQUEST on timeout (resend the signal and try again)
878 class SuspendResume {
879 public:
880 enum State {
881 SR_RUNNING,
882 SR_SUSPEND_REQUEST,
883 SR_SUSPENDED,
884 SR_WAKEUP_REQUEST
885 };
887 private:
888 volatile State _state;
890 private:
891 /* try to switch state from state "from" to state "to"
892 * returns the state set after the method is complete
893 */
894 State switch_state(State from, State to);
896 public:
897 SuspendResume() : _state(SR_RUNNING) { }
899 State state() const { return _state; }
901 State request_suspend() {
902 return switch_state(SR_RUNNING, SR_SUSPEND_REQUEST);
903 }
905 State cancel_suspend() {
906 return switch_state(SR_SUSPEND_REQUEST, SR_RUNNING);
907 }
909 State suspended() {
910 return switch_state(SR_SUSPEND_REQUEST, SR_SUSPENDED);
911 }
913 State request_wakeup() {
914 return switch_state(SR_SUSPENDED, SR_WAKEUP_REQUEST);
915 }
917 State running() {
918 return switch_state(SR_WAKEUP_REQUEST, SR_RUNNING);
919 }
921 bool is_running() const {
922 return _state == SR_RUNNING;
923 }
925 bool is_suspend_request() const {
926 return _state == SR_SUSPEND_REQUEST;
927 }
929 bool is_suspended() const {
930 return _state == SR_SUSPENDED;
931 }
932 };
933 #endif
936 protected:
937 static long _rand_seed; // seed for random number generator
938 static int _processor_count; // number of processors
940 static char* format_boot_path(const char* format_string,
941 const char* home,
942 int home_len,
943 char fileSep,
944 char pathSep);
945 static bool set_boot_path(char fileSep, char pathSep);
946 static char** split_path(const char* path, int* n);
948 };
950 // Note that "PAUSE" is almost always used with synchronization
951 // so arguably we should provide Atomic::SpinPause() instead
952 // of the global SpinPause() with C linkage.
953 // It'd also be eligible for inlining on many platforms.
955 extern "C" int SpinPause();
957 #endif // SHARE_VM_RUNTIME_OS_HPP