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src/share/vm/runtime/os.hpp@bfcb639d5bca (annotated)

src/share/vm/runtime/os.hpp

Wed, 20 Aug 2008 15:41:36 -0700

author

ysr

date

Wed, 20 Aug 2008 15:41:36 -0700

changeset 735

bfcb639d5bca

parent 677

d95b224e9f17

child 791

1ee8caae33af

permissions

-rw-r--r--

6739357: CMS: Switch off CMSPrecleanRefLists1 until 6722113 can be fixed
Summary: Temporarily switch off the precleaning of Reference lists completely until related issues are fixed in 6722113.
Reviewed-by: jmasa, poonam, tonyp

duke@435	1	/*
xdono@631	2	* Copyright 1997-2008 Sun Microsystems, Inc. All Rights Reserved.
duke@435	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435	4	*
duke@435	5	* This code is free software; you can redistribute it and/or modify it
duke@435	6	* under the terms of the GNU General Public License version 2 only, as
duke@435	7	* published by the Free Software Foundation.
duke@435	8	*
duke@435	9	* This code is distributed in the hope that it will be useful, but WITHOUT
duke@435	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435	12	* version 2 for more details (a copy is included in the LICENSE file that
duke@435	13	* accompanied this code).
duke@435	14	*
duke@435	15	* You should have received a copy of the GNU General Public License version
duke@435	16	* 2 along with this work; if not, write to the Free Software Foundation,
duke@435	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435	18	*
duke@435	19	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435	20	* CA 95054 USA or visit www.sun.com if you need additional information or
duke@435	21	* have any questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
duke@435	25	// os defines the interface to operating system; this includes traditional
duke@435	26	// OS services (time, I/O) as well as other functionality with system-
duke@435	27	// dependent code.
duke@435	28
duke@435	29	typedef void (*dll_func)(...);
duke@435	30
duke@435	31	class Thread;
duke@435	32	class JavaThread;
duke@435	33	class Event;
duke@435	34	class DLL;
duke@435	35	class FileHandle;
iveresov@576	36	template<class E> class GrowableArray;
duke@435	37
duke@435	38	// %%%%% Moved ThreadState, START_FN, OSThread to new osThread.hpp. -- Rose
duke@435	39
duke@435	40	// Platform-independent error return values from OS functions
duke@435	41	enum OSReturn {
duke@435	42	OS_OK = 0, // Operation was successful
duke@435	43	OS_ERR = -1, // Operation failed
duke@435	44	OS_INTRPT = -2, // Operation was interrupted
duke@435	45	OS_TIMEOUT = -3, // Operation timed out
duke@435	46	OS_NOMEM = -5, // Operation failed for lack of memory
duke@435	47	OS_NORESOURCE = -6 // Operation failed for lack of nonmemory resource
duke@435	48	};
duke@435	49
duke@435	50	enum ThreadPriority { // JLS 20.20.1-3
duke@435	51	NoPriority = -1, // Initial non-priority value
duke@435	52	MinPriority = 1, // Minimum priority
duke@435	53	NormPriority = 5, // Normal (non-daemon) priority
duke@435	54	NearMaxPriority = 9, // High priority, used for VMThread
duke@435	55	MaxPriority = 10 // Highest priority, used for WatcherThread
duke@435	56	// ensures that VMThread doesn't starve profiler
duke@435	57	};
duke@435	58
duke@435	59	// Typedef for structured exception handling support
duke@435	60	typedef void (*java_call_t)(JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread);
duke@435	61
duke@435	62	class os: AllStatic {
duke@435	63	private:
duke@435	64	enum { page_sizes_max = 9 }; // Size of _page_sizes array (8 plus a sentinel)
duke@435	65
duke@435	66	static OSThread* _starting_thread;
duke@435	67	static address _polling_page;
duke@435	68	static volatile int32_t * _mem_serialize_page;
duke@435	69	static uintptr_t _serialize_page_mask;
duke@435	70	static size_t _page_sizes[page_sizes_max];
duke@435	71
duke@435	72	static void init_page_sizes(size_t default_page_size) {
duke@435	73	_page_sizes[0] = default_page_size;
duke@435	74	_page_sizes[1] = 0; // sentinel
duke@435	75	}
duke@435	76
duke@435	77	public:
duke@435	78
duke@435	79	static void init(void); // Called before command line parsing
duke@435	80	static jint init_2(void); // Called after command line parsing
duke@435	81
duke@435	82	// File names are case-insensitive on windows only
duke@435	83	// Override me as needed
duke@435	84	static int file_name_strcmp(const char* s1, const char* s2);
duke@435	85
duke@435	86	static bool getenv(const char* name, char* buffer, int len);
duke@435	87	static bool have_special_privileges();
duke@435	88
duke@435	89	static jlong javaTimeMillis();
duke@435	90	static jlong javaTimeNanos();
duke@435	91	static void javaTimeNanos_info(jvmtiTimerInfo *info_ptr);
duke@435	92	static void run_periodic_checks();
duke@435	93
duke@435	94
duke@435	95	// Returns the elapsed time in seconds since the vm started.
duke@435	96	static double elapsedTime();
duke@435	97
duke@435	98	// Returns real time in seconds since an arbitrary point
duke@435	99	// in the past.
duke@435	100	static bool getTimesSecs(double* process_real_time,
duke@435	101	double* process_user_time,
duke@435	102	double* process_system_time);
duke@435	103
duke@435	104	// Interface to the performance counter
duke@435	105	static jlong elapsed_counter();
duke@435	106	static jlong elapsed_frequency();
duke@435	107
duke@435	108	// Return current local time in a string (YYYY-MM-DD HH:MM:SS).
duke@435	109	// It is MT safe, but not async-safe, as reading time zone
duke@435	110	// information may require a lock on some platforms.
duke@435	111	static char* local_time_string(char *buf, size_t buflen);
duke@435	112	// Fill in buffer with current local time as an ISO-8601 string.
duke@435	113	// E.g., YYYY-MM-DDThh:mm:ss.mmm+zzzz.
duke@435	114	// Returns buffer, or NULL if it failed.
duke@435	115	static char* iso8601_time(char* buffer, size_t buffer_length);
duke@435	116
duke@435	117	// Interface for detecting multiprocessor system
duke@435	118	static inline bool is_MP() {
duke@435	119	assert(_processor_count > 0, "invalid processor count");
duke@435	120	return _processor_count > 1;
duke@435	121	}
duke@435	122	static julong available_memory();
duke@435	123	static julong physical_memory();
duke@435	124	static julong allocatable_physical_memory(julong size);
duke@435	125	static bool is_server_class_machine();
duke@435	126
duke@435	127	// number of CPUs
duke@435	128	static int processor_count() {
duke@435	129	return _processor_count;
duke@435	130	}
duke@435	131
duke@435	132	// Returns the number of CPUs this process is currently allowed to run on.
duke@435	133	// Note that on some OSes this can change dynamically.
duke@435	134	static int active_processor_count();
duke@435	135
duke@435	136	// Bind processes to processors.
duke@435	137	// This is a two step procedure:
duke@435	138	// first you generate a distribution of processes to processors,
duke@435	139	// then you bind processes according to that distribution.
duke@435	140	// Compute a distribution for number of processes to processors.
duke@435	141	// Stores the processor id's into the distribution array argument.
duke@435	142	// Returns true if it worked, false if it didn't.
duke@435	143	static bool distribute_processes(uint length, uint* distribution);
duke@435	144	// Binds the current process to a processor.
duke@435	145	// Returns true if it worked, false if it didn't.
duke@435	146	static bool bind_to_processor(uint processor_id);
duke@435	147
duke@435	148	// Interface for stack banging (predetect possible stack overflow for
duke@435	149	// exception processing) There are guard pages, and above that shadow
duke@435	150	// pages for stack overflow checking.
duke@435	151	static bool uses_stack_guard_pages();
duke@435	152	static bool allocate_stack_guard_pages();
duke@435	153	static void bang_stack_shadow_pages();
duke@435	154	static bool stack_shadow_pages_available(Thread *thread, methodHandle method);
duke@435	155
duke@435	156	// OS interface to Virtual Memory
duke@435	157
duke@435	158	// Return the default page size.
duke@435	159	static int vm_page_size();
duke@435	160
duke@435	161	// Return the page size to use for a region of memory. The min_pages argument
duke@435	162	// is a hint intended to limit fragmentation; it says the returned page size
duke@435	163	// should be <= region_max_size / min_pages. Because min_pages is a hint,
duke@435	164	// this routine may return a size larger than region_max_size / min_pages.
duke@435	165	//
duke@435	166	// The current implementation ignores min_pages if a larger page size is an
duke@435	167	// exact multiple of both region_min_size and region_max_size. This allows
duke@435	168	// larger pages to be used when doing so would not cause fragmentation; in
duke@435	169	// particular, a single page can be used when region_min_size ==
duke@435	170	// region_max_size == a supported page size.
duke@435	171	static size_t page_size_for_region(size_t region_min_size,
duke@435	172	size_t region_max_size,
duke@435	173	uint min_pages);
duke@435	174
duke@435	175	// Method for tracing page sizes returned by the above method; enabled by
duke@435	176	// TracePageSizes. The region_{min,max}_size parameters should be the values
duke@435	177	// passed to page_size_for_region() and page_size should be the result of that
duke@435	178	// call. The (optional) base and size parameters should come from the
duke@435	179	// ReservedSpace base() and size() methods.
duke@435	180	static void trace_page_sizes(const char* str, const size_t region_min_size,
duke@435	181	const size_t region_max_size,
duke@435	182	const size_t page_size,
duke@435	183	const char* base = NULL,
duke@435	184	const size_t size = 0) PRODUCT_RETURN;
duke@435	185
duke@435	186	static int vm_allocation_granularity();
duke@435	187	static char* reserve_memory(size_t bytes, char* addr = 0,
duke@435	188	size_t alignment_hint = 0);
duke@435	189	static char* attempt_reserve_memory_at(size_t bytes, char* addr);
duke@435	190	static void split_reserved_memory(char *base, size_t size,
duke@435	191	size_t split, bool realloc);
duke@435	192	static bool commit_memory(char* addr, size_t bytes);
duke@435	193	static bool commit_memory(char* addr, size_t size, size_t alignment_hint);
duke@435	194	static bool uncommit_memory(char* addr, size_t bytes);
duke@435	195	static bool release_memory(char* addr, size_t bytes);
coleenp@672	196
coleenp@672	197	enum ProtType { MEM_PROT_NONE, MEM_PROT_READ, MEM_PROT_RW, MEM_PROT_RWX };
coleenp@672	198	static bool protect_memory(char* addr, size_t bytes, ProtType prot,
coleenp@672	199	bool is_committed = false);
coleenp@672	200
duke@435	201	static bool guard_memory(char* addr, size_t bytes);
duke@435	202	static bool unguard_memory(char* addr, size_t bytes);
duke@435	203	static char* map_memory(int fd, const char* file_name, size_t file_offset,
duke@435	204	char *addr, size_t bytes, bool read_only = false,
duke@435	205	bool allow_exec = false);
duke@435	206	static char* remap_memory(int fd, const char* file_name, size_t file_offset,
duke@435	207	char *addr, size_t bytes, bool read_only,
duke@435	208	bool allow_exec);
duke@435	209	static bool unmap_memory(char *addr, size_t bytes);
duke@435	210	static void free_memory(char *addr, size_t bytes);
duke@435	211	static void realign_memory(char *addr, size_t bytes, size_t alignment_hint);
duke@435	212
duke@435	213	// NUMA-specific interface
iveresov@576	214	static bool numa_has_static_binding();
iveresov@576	215	static bool numa_has_group_homing();
iveresov@576	216	static void numa_make_local(char *addr, size_t bytes, int lgrp_hint);
duke@435	217	static void numa_make_global(char *addr, size_t bytes);
duke@435	218	static size_t numa_get_groups_num();
duke@435	219	static size_t numa_get_leaf_groups(int *ids, size_t size);
duke@435	220	static bool numa_topology_changed();
duke@435	221	static int numa_get_group_id();
duke@435	222
duke@435	223	// Page manipulation
duke@435	224	struct page_info {
duke@435	225	size_t size;
duke@435	226	int lgrp_id;
duke@435	227	};
duke@435	228	static bool get_page_info(char *start, page_info* info);
duke@435	229	static char* scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found);
duke@435	230
duke@435	231	static char* non_memory_address_word();
duke@435	232	// reserve, commit and pin the entire memory region
duke@435	233	static char* reserve_memory_special(size_t size);
duke@435	234	static bool release_memory_special(char* addr, size_t bytes);
duke@435	235	static bool large_page_init();
duke@435	236	static size_t large_page_size();
duke@435	237	static bool can_commit_large_page_memory();
jcoomes@514	238	static bool can_execute_large_page_memory();
duke@435	239
duke@435	240	// OS interface to polling page
duke@435	241	static address get_polling_page() { return _polling_page; }
duke@435	242	static void set_polling_page(address page) { _polling_page = page; }
duke@435	243	static bool is_poll_address(address addr) { return addr >= _polling_page && addr < (_polling_page + os::vm_page_size()); }
duke@435	244	static void make_polling_page_unreadable();
duke@435	245	static void make_polling_page_readable();
duke@435	246
duke@435	247	// Routines used to serialize the thread state without using membars
duke@435	248	static void serialize_thread_states();
duke@435	249
duke@435	250	// Since we write to the serialize page from every thread, we
duke@435	251	// want stores to be on unique cache lines whenever possible
duke@435	252	// in order to minimize CPU cross talk. We pre-compute the
duke@435	253	// amount to shift the thread* to make this offset unique to
duke@435	254	// each thread.
duke@435	255	static int get_serialize_page_shift_count() {
duke@435	256	return SerializePageShiftCount;
duke@435	257	}
duke@435	258
duke@435	259	static void set_serialize_page_mask(uintptr_t mask) {
duke@435	260	_serialize_page_mask = mask;
duke@435	261	}
duke@435	262
duke@435	263	static unsigned int get_serialize_page_mask() {
duke@435	264	return _serialize_page_mask;
duke@435	265	}
duke@435	266
duke@435	267	static void set_memory_serialize_page(address page);
duke@435	268
duke@435	269	static address get_memory_serialize_page() {
duke@435	270	return (address)_mem_serialize_page;
duke@435	271	}
duke@435	272
duke@435	273	static inline void write_memory_serialize_page(JavaThread *thread) {
duke@435	274	uintptr_t page_offset = ((uintptr_t)thread >>
duke@435	275	get_serialize_page_shift_count()) &
duke@435	276	get_serialize_page_mask();
duke@435	277	*(volatile int32_t *)((uintptr_t)_mem_serialize_page+page_offset) = 1;
duke@435	278	}
duke@435	279
duke@435	280	static bool is_memory_serialize_page(JavaThread *thread, address addr) {
duke@435	281	address thr_addr;
duke@435	282	if (UseMembar) return false;
duke@435	283	// Calculate thread specific address
duke@435	284	if (thread == NULL) return false;
duke@435	285	// TODO-FIXME: some platforms mask off faulting addresses to the base pagesize.
duke@435	286	// Instead of using a test for equality we should probably use something
duke@435	287	// of the form:
duke@435	288	// return ((_mem_serialize_page ^ addr) & -pagesize) == 0
duke@435	289	//
duke@435	290	thr_addr = (address)(((uintptr_t)thread >>
duke@435	291	get_serialize_page_shift_count()) &
duke@435	292	get_serialize_page_mask()) + (uintptr_t)_mem_serialize_page;
duke@435	293	return (thr_addr == addr);
duke@435	294	}
duke@435	295
duke@435	296	static void block_on_serialize_page_trap();
duke@435	297
duke@435	298	// threads
duke@435	299
duke@435	300	enum ThreadType {
duke@435	301	vm_thread,
duke@435	302	cgc_thread, // Concurrent GC thread
duke@435	303	pgc_thread, // Parallel GC thread
duke@435	304	java_thread,
duke@435	305	compiler_thread,
duke@435	306	watcher_thread
duke@435	307	};
duke@435	308
duke@435	309	static bool create_thread(Thread* thread,
duke@435	310	ThreadType thr_type,
duke@435	311	size_t stack_size = 0);
duke@435	312	static bool create_main_thread(JavaThread* thread);
duke@435	313	static bool create_attached_thread(JavaThread* thread);
duke@435	314	static void pd_start_thread(Thread* thread);
duke@435	315	static void start_thread(Thread* thread);
duke@435	316
duke@435	317	static void initialize_thread();
duke@435	318	static void free_thread(OSThread* osthread);
duke@435	319
duke@435	320	// thread id on Linux/64bit is 64bit, on Windows and Solaris, it's 32bit
duke@435	321	static intx current_thread_id();
duke@435	322	static int current_process_id();
duke@435	323	// hpi::read for calls from non native state
duke@435	324	// For performance, hpi::read is only callable from _thread_in_native
duke@435	325	static size_t read(int fd, void *buf, unsigned int nBytes);
duke@435	326	static int sleep(Thread* thread, jlong ms, bool interruptable);
duke@435	327	static int naked_sleep();
duke@435	328	static void infinite_sleep(); // never returns, use with CAUTION
duke@435	329	static void yield(); // Yields to all threads with same priority
duke@435	330	enum YieldResult {
duke@435	331	YIELD_SWITCHED = 1, // caller descheduled, other ready threads exist & ran
duke@435	332	YIELD_NONEREADY = 0, // No other runnable/ready threads.
duke@435	333	// platform-specific yield return immediately
duke@435	334	YIELD_UNKNOWN = -1 // Unknown: platform doesn't support _SWITCHED or _NONEREADY
duke@435	335	// YIELD_SWITCHED and YIELD_NONREADY imply the platform supports a "strong"
duke@435	336	// yield that can be used in lieu of blocking.
duke@435	337	} ;
duke@435	338	static YieldResult NakedYield () ;
duke@435	339	static void yield_all(int attempts = 0); // Yields to all other threads including lower priority
duke@435	340	static void loop_breaker(int attempts); // called from within tight loops to possibly influence time-sharing
duke@435	341	static OSReturn set_priority(Thread* thread, ThreadPriority priority);
duke@435	342	static OSReturn get_priority(const Thread* const thread, ThreadPriority& priority);
duke@435	343
duke@435	344	static void interrupt(Thread* thread);
duke@435	345	static bool is_interrupted(Thread* thread, bool clear_interrupted);
duke@435	346
duke@435	347	static int pd_self_suspend_thread(Thread* thread);
duke@435	348
duke@435	349	static ExtendedPC fetch_frame_from_context(void* ucVoid, intptr_t** sp, intptr_t** fp);
duke@435	350	static frame fetch_frame_from_context(void* ucVoid);
duke@435	351
duke@435	352	static ExtendedPC get_thread_pc(Thread *thread);
duke@435	353	static void breakpoint();
duke@435	354
duke@435	355	static address current_stack_pointer();
duke@435	356	static address current_stack_base();
duke@435	357	static size_t current_stack_size();
duke@435	358
duke@435	359	static int message_box(const char* title, const char* message);
duke@435	360	static char* do_you_want_to_debug(const char* message);
duke@435	361
duke@435	362	// run cmd in a separate process and return its exit code; or -1 on failures
duke@435	363	static int fork_and_exec(char *cmd);
duke@435	364
duke@435	365	// Set file to send error reports.
duke@435	366	static void set_error_file(const char *logfile);
duke@435	367
duke@435	368	// os::exit() is merged with vm_exit()
duke@435	369	// static void exit(int num);
duke@435	370
duke@435	371	// Terminate the VM, but don't exit the process
duke@435	372	static void shutdown();
duke@435	373
duke@435	374	// Terminate with an error. Default is to generate a core file on platforms
duke@435	375	// that support such things. This calls shutdown() and then aborts.
duke@435	376	static void abort(bool dump_core = true);
duke@435	377
duke@435	378	// Die immediately, no exit hook, no abort hook, no cleanup.
duke@435	379	static void die();
duke@435	380
duke@435	381	// Reading directories.
duke@435	382	static DIR* opendir(const char* dirname);
duke@435	383	static int readdir_buf_size(const char *path);
duke@435	384	static struct dirent* readdir(DIR* dirp, dirent* dbuf);
duke@435	385	static int closedir(DIR* dirp);
duke@435	386
duke@435	387	// Dynamic library extension
duke@435	388	static const char* dll_file_extension();
duke@435	389
duke@435	390	static const char* get_temp_directory();
duke@435	391	static const char* get_current_directory(char *buf, int buflen);
duke@435	392
kamg@677	393	// Builds a platform-specific full library path given a ld path and lib name
kamg@677	394	static void dll_build_name(char* buffer, size_t size,
kamg@677	395	const char* pathname, const char* fname);
kamg@677	396
duke@435	397	// Symbol lookup, find nearest function name; basically it implements
duke@435	398	// dladdr() for all platforms. Name of the nearest function is copied
duke@435	399	// to buf. Distance from its base address is returned as offset.
duke@435	400	// If function name is not found, buf[0] is set to '\0' and offset is
duke@435	401	// set to -1.
duke@435	402	static bool dll_address_to_function_name(address addr, char* buf,
duke@435	403	int buflen, int* offset);
duke@435	404
duke@435	405	// Locate DLL/DSO. On success, full path of the library is copied to
duke@435	406	// buf, and offset is set to be the distance between addr and the
duke@435	407	// library's base address. On failure, buf[0] is set to '\0' and
duke@435	408	// offset is set to -1.
duke@435	409	static bool dll_address_to_library_name(address addr, char* buf,
duke@435	410	int buflen, int* offset);
duke@435	411
duke@435	412	// Find out whether the pc is in the static code for jvm.dll/libjvm.so.
duke@435	413	static bool address_is_in_vm(address addr);
duke@435	414
duke@435	415	// Loads .dll/.so and
duke@435	416	// in case of error it checks if .dll/.so was built for the
duke@435	417	// same architecture as Hotspot is running on
duke@435	418	static void* dll_load(const char *name, char *ebuf, int ebuflen);
duke@435	419
kamg@677	420	// lookup symbol in a shared library
kamg@677	421	static void* dll_lookup(void* handle, const char* name);
kamg@677	422
duke@435	423	// Print out system information; they are called by fatal error handler.
duke@435	424	// Output format may be different on different platforms.
duke@435	425	static void print_os_info(outputStream* st);
duke@435	426	static void print_cpu_info(outputStream* st);
duke@435	427	static void print_memory_info(outputStream* st);
duke@435	428	static void print_dll_info(outputStream* st);
duke@435	429	static void print_environment_variables(outputStream* st, const char** env_list, char* buffer, int len);
duke@435	430	static void print_context(outputStream* st, void* context);
duke@435	431	static void print_siginfo(outputStream* st, void* siginfo);
duke@435	432	static void print_signal_handlers(outputStream* st, char* buf, size_t buflen);
duke@435	433	static void print_date_and_time(outputStream* st);
duke@435	434
duke@435	435	// The following two functions are used by fatal error handler to trace
duke@435	436	// native (C) frames. They are not part of frame.hpp/frame.cpp because
duke@435	437	// frame.hpp/cpp assume thread is JavaThread, and also because different
duke@435	438	// OS/compiler may have different convention or provide different API to
duke@435	439	// walk C frames.
duke@435	440	//
duke@435	441	// We don't attempt to become a debugger, so we only follow frames if that
duke@435	442	// does not require a lookup in the unwind table, which is part of the binary
duke@435	443	// file but may be unsafe to read after a fatal error. So on x86, we can
duke@435	444	// only walk stack if %ebp is used as frame pointer; on ia64, it's not
duke@435	445	// possible to walk C stack without having the unwind table.
duke@435	446	static bool is_first_C_frame(frame *fr);
duke@435	447	static frame get_sender_for_C_frame(frame *fr);
duke@435	448
duke@435	449	// return current frame. pc() and sp() are set to NULL on failure.
duke@435	450	static frame current_frame();
duke@435	451
duke@435	452	static void print_hex_dump(outputStream* st, address start, address end, int unitsize);
duke@435	453
duke@435	454	// returns a string to describe the exception/signal;
duke@435	455	// returns NULL if exception_code is not an OS exception/signal.
duke@435	456	static const char* exception_name(int exception_code, char* buf, size_t buflen);
duke@435	457
duke@435	458	// Returns native Java library, loads if necessary
duke@435	459	static void* native_java_library();
duke@435	460
duke@435	461	// Fills in path to jvm.dll/libjvm.so (this info used to find hpi).
duke@435	462	static void jvm_path(char *buf, jint buflen);
duke@435	463
duke@435	464	// JNI names
duke@435	465	static void print_jni_name_prefix_on(outputStream* st, int args_size);
duke@435	466	static void print_jni_name_suffix_on(outputStream* st, int args_size);
duke@435	467
duke@435	468	// File conventions
duke@435	469	static const char* file_separator();
duke@435	470	static const char* line_separator();
duke@435	471	static const char* path_separator();
duke@435	472
duke@435	473	// Init os specific system properties values
duke@435	474	static void init_system_properties_values();
duke@435	475
duke@435	476	// IO operations, non-JVM_ version.
duke@435	477	static int stat(const char* path, struct stat* sbuf);
duke@435	478	static bool dir_is_empty(const char* path);
duke@435	479
duke@435	480	// IO operations on binary files
duke@435	481	static int create_binary_file(const char* path, bool rewrite_existing);
duke@435	482	static jlong current_file_offset(int fd);
duke@435	483	static jlong seek_to_file_offset(int fd, jlong offset);
duke@435	484
duke@435	485	// Thread Local Storage
duke@435	486	static int allocate_thread_local_storage();
duke@435	487	static void thread_local_storage_at_put(int index, void* value);
duke@435	488	static void* thread_local_storage_at(int index);
duke@435	489	static void free_thread_local_storage(int index);
duke@435	490
duke@435	491	// General allocation (must be MT-safe)
duke@435	492	static void* malloc (size_t size);
duke@435	493	static void* realloc (void *memblock, size_t size);
duke@435	494	static void free (void *memblock);
duke@435	495	static bool check_heap(bool force = false); // verify C heap integrity
duke@435	496	static char* strdup(const char *); // Like strdup
duke@435	497
duke@435	498	#ifndef PRODUCT
duke@435	499	static int num_mallocs; // # of calls to malloc/realloc
duke@435	500	static size_t alloc_bytes; // # of bytes allocated
duke@435	501	static int num_frees; // # of calls to free
duke@435	502	#endif
duke@435	503
duke@435	504	// Printing 64 bit integers
duke@435	505	static const char* jlong_format_specifier();
duke@435	506	static const char* julong_format_specifier();
duke@435	507
duke@435	508	// Support for signals (see JVM_RaiseSignal, JVM_RegisterSignal)
duke@435	509	static void signal_init();
duke@435	510	static void signal_init_pd();
duke@435	511	static void signal_notify(int signal_number);
duke@435	512	static void* signal(int signal_number, void* handler);
duke@435	513	static void signal_raise(int signal_number);
duke@435	514	static int signal_wait();
duke@435	515	static int signal_lookup();
duke@435	516	static void* user_handler();
duke@435	517	static void terminate_signal_thread();
duke@435	518	static int sigexitnum_pd();
duke@435	519
duke@435	520	// random number generation
duke@435	521	static long random(); // return 32bit pseudorandom number
duke@435	522	static void init_random(long initval); // initialize random sequence
duke@435	523
duke@435	524	// Structured OS Exception support
duke@435	525	static void os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread);
duke@435	526
duke@435	527	// JVMTI & JVM monitoring and management support
duke@435	528	// The thread_cpu_time() and current_thread_cpu_time() are only
duke@435	529	// supported if is_thread_cpu_time_supported() returns true.
duke@435	530	// They are not supported on Solaris T1.
duke@435	531
duke@435	532	// Thread CPU Time - return the fast estimate on a platform
duke@435	533	// On Solaris - call gethrvtime (fast) - user time only
duke@435	534	// On Linux - fast clock_gettime where available - user+sys
duke@435	535	// - otherwise: very slow /proc fs - user+sys
duke@435	536	// On Windows - GetThreadTimes - user+sys
duke@435	537	static jlong current_thread_cpu_time();
duke@435	538	static jlong thread_cpu_time(Thread* t);
duke@435	539
duke@435	540	// Thread CPU Time with user_sys_cpu_time parameter.
duke@435	541	//
duke@435	542	// If user_sys_cpu_time is true, user+sys time is returned.
duke@435	543	// Otherwise, only user time is returned
duke@435	544	static jlong current_thread_cpu_time(bool user_sys_cpu_time);
duke@435	545	static jlong thread_cpu_time(Thread* t, bool user_sys_cpu_time);
duke@435	546
duke@435	547	// Return a bunch of info about the timers.
duke@435	548	// Note that the returned info for these two functions may be different
duke@435	549	// on some platforms
duke@435	550	static void current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr);
duke@435	551	static void thread_cpu_time_info(jvmtiTimerInfo *info_ptr);
duke@435	552
duke@435	553	static bool is_thread_cpu_time_supported();
duke@435	554
duke@435	555	// System loadavg support. Returns -1 if load average cannot be obtained.
duke@435	556	static int loadavg(double loadavg[], int nelem);
duke@435	557
duke@435	558	// Hook for os specific jvm options that we don't want to abort on seeing
duke@435	559	static bool obsolete_option(const JavaVMOption *option);
duke@435	560
duke@435	561	// Platform dependent stuff
duke@435	562	#include "incls/_os_pd.hpp.incl"
duke@435	563
duke@435	564	// debugging support (mostly used by debug.cpp)
duke@435	565	static bool find(address pc) PRODUCT_RETURN0; // OS specific function to make sense out of an address
duke@435	566
duke@435	567	static bool dont_yield(); // when true, JVM_Yield() is nop
duke@435	568	static void print_statistics();
duke@435	569
duke@435	570	// Thread priority helpers (implemented in OS-specific part)
duke@435	571	static OSReturn set_native_priority(Thread* thread, int native_prio);
duke@435	572	static OSReturn get_native_priority(const Thread* const thread, int* priority_ptr);
duke@435	573	static int java_to_os_priority[MaxPriority + 1];
duke@435	574	// Hint to the underlying OS that a task switch would not be good.
duke@435	575	// Void return because it's a hint and can fail.
duke@435	576	static void hint_no_preempt();
duke@435	577
duke@435	578	// Used at creation if requested by the diagnostic flag PauseAtStartup.
duke@435	579	// Causes the VM to wait until an external stimulus has been applied
duke@435	580	// (for Unix, that stimulus is a signal, for Windows, an external
duke@435	581	// ResumeThread call)
duke@435	582	static void pause();
duke@435	583
duke@435	584	protected:
duke@435	585	static long _rand_seed; // seed for random number generator
duke@435	586	static int _processor_count; // number of processors
duke@435	587
duke@435	588	static char* format_boot_path(const char* format_string,
duke@435	589	const char* home,
duke@435	590	int home_len,
duke@435	591	char fileSep,
duke@435	592	char pathSep);
duke@435	593	static bool set_boot_path(char fileSep, char pathSep);
duke@435	594	};
duke@435	595
duke@435	596	// Note that "PAUSE" is almost always used with synchronization
duke@435	597	// so arguably we should provide Atomic::SpinPause() instead
duke@435	598	// of the global SpinPause() with C linkage.
duke@435	599	// It'd also be eligible for inlining on many platforms.
duke@435	600
duke@435	601	extern "C" int SpinPause () ;
duke@435	602	extern "C" int SafeFetch32 (int * adr, int errValue) ;
duke@435	603	extern "C" intptr_t SafeFetchN (intptr_t * adr, intptr_t errValue) ;