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src/share/vm/runtime/os.hpp@c6ff24ceec1c (annotated)

src/share/vm/runtime/os.hpp

Thu, 10 Apr 2008 15:49:16 -0400

author

sbohne

date

Thu, 10 Apr 2008 15:49:16 -0400

changeset 528

c6ff24ceec1c

parent 514

82db0859acbe

child 576

fcbfc50865ab

permissions

-rw-r--r--

6686407: Fix for 6666698 broke -XX:BiasedLockingStartupDelay=0
Summary: Stack allocated VM_EnableBiasedLocking op must be marked as such
Reviewed-by: xlu, acorn, never, dholmes

duke@435	1	/*
duke@435	2	* Copyright 1997-2007 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;
duke@435	36
duke@435	37	// %%%%% Moved ThreadState, START_FN, OSThread to new osThread.hpp. -- Rose
duke@435	38
duke@435	39	// Platform-independent error return values from OS functions
duke@435	40	enum OSReturn {
duke@435	41	OS_OK = 0, // Operation was successful
duke@435	42	OS_ERR = -1, // Operation failed
duke@435	43	OS_INTRPT = -2, // Operation was interrupted
duke@435	44	OS_TIMEOUT = -3, // Operation timed out
duke@435	45	OS_NOMEM = -5, // Operation failed for lack of memory
duke@435	46	OS_NORESOURCE = -6 // Operation failed for lack of nonmemory resource
duke@435	47	};
duke@435	48
duke@435	49	enum ThreadPriority { // JLS 20.20.1-3
duke@435	50	NoPriority = -1, // Initial non-priority value
duke@435	51	MinPriority = 1, // Minimum priority
duke@435	52	NormPriority = 5, // Normal (non-daemon) priority
duke@435	53	NearMaxPriority = 9, // High priority, used for VMThread
duke@435	54	MaxPriority = 10 // Highest priority, used for WatcherThread
duke@435	55	// ensures that VMThread doesn't starve profiler
duke@435	56	};
duke@435	57
duke@435	58	// Typedef for structured exception handling support
duke@435	59	typedef void (*java_call_t)(JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread);
duke@435	60
duke@435	61	class os: AllStatic {
duke@435	62	private:
duke@435	63	enum { page_sizes_max = 9 }; // Size of _page_sizes array (8 plus a sentinel)
duke@435	64
duke@435	65	static OSThread* _starting_thread;
duke@435	66	static address _polling_page;
duke@435	67	static volatile int32_t * _mem_serialize_page;
duke@435	68	static uintptr_t _serialize_page_mask;
duke@435	69	static size_t _page_sizes[page_sizes_max];
duke@435	70
duke@435	71	static void init_page_sizes(size_t default_page_size) {
duke@435	72	_page_sizes[0] = default_page_size;
duke@435	73	_page_sizes[1] = 0; // sentinel
duke@435	74	}
duke@435	75
duke@435	76	public:
duke@435	77
duke@435	78	static void init(void); // Called before command line parsing
duke@435	79	static jint init_2(void); // Called after command line parsing
duke@435	80
duke@435	81	// File names are case-insensitive on windows only
duke@435	82	// Override me as needed
duke@435	83	static int file_name_strcmp(const char* s1, const char* s2);
duke@435	84
duke@435	85	static bool getenv(const char* name, char* buffer, int len);
duke@435	86	static bool have_special_privileges();
duke@435	87
duke@435	88	static jlong javaTimeMillis();
duke@435	89	static jlong javaTimeNanos();
duke@435	90	static void javaTimeNanos_info(jvmtiTimerInfo *info_ptr);
duke@435	91	static void run_periodic_checks();
duke@435	92
duke@435	93
duke@435	94	// Returns the elapsed time in seconds since the vm started.
duke@435	95	static double elapsedTime();
duke@435	96
duke@435	97	// Returns real time in seconds since an arbitrary point
duke@435	98	// in the past.
duke@435	99	static bool getTimesSecs(double* process_real_time,
duke@435	100	double* process_user_time,
duke@435	101	double* process_system_time);
duke@435	102
duke@435	103	// Interface to the performance counter
duke@435	104	static jlong elapsed_counter();
duke@435	105	static jlong elapsed_frequency();
duke@435	106
duke@435	107	// Return current local time in a string (YYYY-MM-DD HH:MM:SS).
duke@435	108	// It is MT safe, but not async-safe, as reading time zone
duke@435	109	// information may require a lock on some platforms.
duke@435	110	static char* local_time_string(char *buf, size_t buflen);
duke@435	111	// Fill in buffer with current local time as an ISO-8601 string.
duke@435	112	// E.g., YYYY-MM-DDThh:mm:ss.mmm+zzzz.
duke@435	113	// Returns buffer, or NULL if it failed.
duke@435	114	static char* iso8601_time(char* buffer, size_t buffer_length);
duke@435	115
duke@435	116	// Interface for detecting multiprocessor system
duke@435	117	static inline bool is_MP() {
duke@435	118	assert(_processor_count > 0, "invalid processor count");
duke@435	119	return _processor_count > 1;
duke@435	120	}
duke@435	121	static julong available_memory();
duke@435	122	static julong physical_memory();
duke@435	123	static julong allocatable_physical_memory(julong size);
duke@435	124	static bool is_server_class_machine();
duke@435	125
duke@435	126	// number of CPUs
duke@435	127	static int processor_count() {
duke@435	128	return _processor_count;
duke@435	129	}
duke@435	130
duke@435	131	// Returns the number of CPUs this process is currently allowed to run on.
duke@435	132	// Note that on some OSes this can change dynamically.
duke@435	133	static int active_processor_count();
duke@435	134
duke@435	135	// Bind processes to processors.
duke@435	136	// This is a two step procedure:
duke@435	137	// first you generate a distribution of processes to processors,
duke@435	138	// then you bind processes according to that distribution.
duke@435	139	// Compute a distribution for number of processes to processors.
duke@435	140	// Stores the processor id's into the distribution array argument.
duke@435	141	// Returns true if it worked, false if it didn't.
duke@435	142	static bool distribute_processes(uint length, uint* distribution);
duke@435	143	// Binds the current process to a processor.
duke@435	144	// Returns true if it worked, false if it didn't.
duke@435	145	static bool bind_to_processor(uint processor_id);
duke@435	146
duke@435	147	// Interface for stack banging (predetect possible stack overflow for
duke@435	148	// exception processing) There are guard pages, and above that shadow
duke@435	149	// pages for stack overflow checking.
duke@435	150	static bool uses_stack_guard_pages();
duke@435	151	static bool allocate_stack_guard_pages();
duke@435	152	static void bang_stack_shadow_pages();
duke@435	153	static bool stack_shadow_pages_available(Thread *thread, methodHandle method);
duke@435	154
duke@435	155	// OS interface to Virtual Memory
duke@435	156
duke@435	157	// Return the default page size.
duke@435	158	static int vm_page_size();
duke@435	159
duke@435	160	// Return the page size to use for a region of memory. The min_pages argument
duke@435	161	// is a hint intended to limit fragmentation; it says the returned page size
duke@435	162	// should be <= region_max_size / min_pages. Because min_pages is a hint,
duke@435	163	// this routine may return a size larger than region_max_size / min_pages.
duke@435	164	//
duke@435	165	// The current implementation ignores min_pages if a larger page size is an
duke@435	166	// exact multiple of both region_min_size and region_max_size. This allows
duke@435	167	// larger pages to be used when doing so would not cause fragmentation; in
duke@435	168	// particular, a single page can be used when region_min_size ==
duke@435	169	// region_max_size == a supported page size.
duke@435	170	static size_t page_size_for_region(size_t region_min_size,
duke@435	171	size_t region_max_size,
duke@435	172	uint min_pages);
duke@435	173
duke@435	174	// Method for tracing page sizes returned by the above method; enabled by
duke@435	175	// TracePageSizes. The region_{min,max}_size parameters should be the values
duke@435	176	// passed to page_size_for_region() and page_size should be the result of that
duke@435	177	// call. The (optional) base and size parameters should come from the
duke@435	178	// ReservedSpace base() and size() methods.
duke@435	179	static void trace_page_sizes(const char* str, const size_t region_min_size,
duke@435	180	const size_t region_max_size,
duke@435	181	const size_t page_size,
duke@435	182	const char* base = NULL,
duke@435	183	const size_t size = 0) PRODUCT_RETURN;
duke@435	184
duke@435	185	static int vm_allocation_granularity();
duke@435	186	static char* reserve_memory(size_t bytes, char* addr = 0,
duke@435	187	size_t alignment_hint = 0);
duke@435	188	static char* attempt_reserve_memory_at(size_t bytes, char* addr);
duke@435	189	static void split_reserved_memory(char *base, size_t size,
duke@435	190	size_t split, bool realloc);
duke@435	191	static bool commit_memory(char* addr, size_t bytes);
duke@435	192	static bool commit_memory(char* addr, size_t size, size_t alignment_hint);
duke@435	193	static bool uncommit_memory(char* addr, size_t bytes);
duke@435	194	static bool release_memory(char* addr, size_t bytes);
duke@435	195	static bool protect_memory(char* addr, size_t bytes);
duke@435	196	static bool guard_memory(char* addr, size_t bytes);
duke@435	197	static bool unguard_memory(char* addr, size_t bytes);
duke@435	198	static char* map_memory(int fd, const char* file_name, size_t file_offset,
duke@435	199	char *addr, size_t bytes, bool read_only = false,
duke@435	200	bool allow_exec = false);
duke@435	201	static char* remap_memory(int fd, const char* file_name, size_t file_offset,
duke@435	202	char *addr, size_t bytes, bool read_only,
duke@435	203	bool allow_exec);
duke@435	204	static bool unmap_memory(char *addr, size_t bytes);
duke@435	205	static void free_memory(char *addr, size_t bytes);
duke@435	206	static void realign_memory(char *addr, size_t bytes, size_t alignment_hint);
duke@435	207
duke@435	208	// NUMA-specific interface
duke@435	209	static void numa_make_local(char *addr, size_t bytes);
duke@435	210	static void numa_make_global(char *addr, size_t bytes);
duke@435	211	static size_t numa_get_groups_num();
duke@435	212	static size_t numa_get_leaf_groups(int *ids, size_t size);
duke@435	213	static bool numa_topology_changed();
duke@435	214	static int numa_get_group_id();
duke@435	215
duke@435	216	// Page manipulation
duke@435	217	struct page_info {
duke@435	218	size_t size;
duke@435	219	int lgrp_id;
duke@435	220	};
duke@435	221	static bool get_page_info(char *start, page_info* info);
duke@435	222	static char* scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found);
duke@435	223
duke@435	224	static char* non_memory_address_word();
duke@435	225	// reserve, commit and pin the entire memory region
duke@435	226	static char* reserve_memory_special(size_t size);
duke@435	227	static bool release_memory_special(char* addr, size_t bytes);
duke@435	228	static bool large_page_init();
duke@435	229	static size_t large_page_size();
duke@435	230	static bool can_commit_large_page_memory();
jcoomes@514	231	static bool can_execute_large_page_memory();
duke@435	232
duke@435	233	// OS interface to polling page
duke@435	234	static address get_polling_page() { return _polling_page; }
duke@435	235	static void set_polling_page(address page) { _polling_page = page; }
duke@435	236	static bool is_poll_address(address addr) { return addr >= _polling_page && addr < (_polling_page + os::vm_page_size()); }
duke@435	237	static void make_polling_page_unreadable();
duke@435	238	static void make_polling_page_readable();
duke@435	239
duke@435	240	// Routines used to serialize the thread state without using membars
duke@435	241	static void serialize_thread_states();
duke@435	242
duke@435	243	// Since we write to the serialize page from every thread, we
duke@435	244	// want stores to be on unique cache lines whenever possible
duke@435	245	// in order to minimize CPU cross talk. We pre-compute the
duke@435	246	// amount to shift the thread* to make this offset unique to
duke@435	247	// each thread.
duke@435	248	static int get_serialize_page_shift_count() {
duke@435	249	return SerializePageShiftCount;
duke@435	250	}
duke@435	251
duke@435	252	static void set_serialize_page_mask(uintptr_t mask) {
duke@435	253	_serialize_page_mask = mask;
duke@435	254	}
duke@435	255
duke@435	256	static unsigned int get_serialize_page_mask() {
duke@435	257	return _serialize_page_mask;
duke@435	258	}
duke@435	259
duke@435	260	static void set_memory_serialize_page(address page);
duke@435	261
duke@435	262	static address get_memory_serialize_page() {
duke@435	263	return (address)_mem_serialize_page;
duke@435	264	}
duke@435	265
duke@435	266	static inline void write_memory_serialize_page(JavaThread *thread) {
duke@435	267	uintptr_t page_offset = ((uintptr_t)thread >>
duke@435	268	get_serialize_page_shift_count()) &
duke@435	269	get_serialize_page_mask();
duke@435	270	*(volatile int32_t *)((uintptr_t)_mem_serialize_page+page_offset) = 1;
duke@435	271	}
duke@435	272
duke@435	273	static bool is_memory_serialize_page(JavaThread *thread, address addr) {
duke@435	274	address thr_addr;
duke@435	275	if (UseMembar) return false;
duke@435	276	// Calculate thread specific address
duke@435	277	if (thread == NULL) return false;
duke@435	278	// TODO-FIXME: some platforms mask off faulting addresses to the base pagesize.
duke@435	279	// Instead of using a test for equality we should probably use something
duke@435	280	// of the form:
duke@435	281	// return ((_mem_serialize_page ^ addr) & -pagesize) == 0
duke@435	282	//
duke@435	283	thr_addr = (address)(((uintptr_t)thread >>
duke@435	284	get_serialize_page_shift_count()) &
duke@435	285	get_serialize_page_mask()) + (uintptr_t)_mem_serialize_page;
duke@435	286	return (thr_addr == addr);
duke@435	287	}
duke@435	288
duke@435	289	static void block_on_serialize_page_trap();
duke@435	290
duke@435	291	// threads
duke@435	292
duke@435	293	enum ThreadType {
duke@435	294	vm_thread,
duke@435	295	cgc_thread, // Concurrent GC thread
duke@435	296	pgc_thread, // Parallel GC thread
duke@435	297	java_thread,
duke@435	298	compiler_thread,
duke@435	299	watcher_thread
duke@435	300	};
duke@435	301
duke@435	302	static bool create_thread(Thread* thread,
duke@435	303	ThreadType thr_type,
duke@435	304	size_t stack_size = 0);
duke@435	305	static bool create_main_thread(JavaThread* thread);
duke@435	306	static bool create_attached_thread(JavaThread* thread);
duke@435	307	static void pd_start_thread(Thread* thread);
duke@435	308	static void start_thread(Thread* thread);
duke@435	309
duke@435	310	static void initialize_thread();
duke@435	311	static void free_thread(OSThread* osthread);
duke@435	312
duke@435	313	// thread id on Linux/64bit is 64bit, on Windows and Solaris, it's 32bit
duke@435	314	static intx current_thread_id();
duke@435	315	static int current_process_id();
duke@435	316	// hpi::read for calls from non native state
duke@435	317	// For performance, hpi::read is only callable from _thread_in_native
duke@435	318	static size_t read(int fd, void *buf, unsigned int nBytes);
duke@435	319	static int sleep(Thread* thread, jlong ms, bool interruptable);
duke@435	320	static int naked_sleep();
duke@435	321	static void infinite_sleep(); // never returns, use with CAUTION
duke@435	322	static void yield(); // Yields to all threads with same priority
duke@435	323	enum YieldResult {
duke@435	324	YIELD_SWITCHED = 1, // caller descheduled, other ready threads exist & ran
duke@435	325	YIELD_NONEREADY = 0, // No other runnable/ready threads.
duke@435	326	// platform-specific yield return immediately
duke@435	327	YIELD_UNKNOWN = -1 // Unknown: platform doesn't support _SWITCHED or _NONEREADY
duke@435	328	// YIELD_SWITCHED and YIELD_NONREADY imply the platform supports a "strong"
duke@435	329	// yield that can be used in lieu of blocking.
duke@435	330	} ;
duke@435	331	static YieldResult NakedYield () ;
duke@435	332	static void yield_all(int attempts = 0); // Yields to all other threads including lower priority
duke@435	333	static void loop_breaker(int attempts); // called from within tight loops to possibly influence time-sharing
duke@435	334	static OSReturn set_priority(Thread* thread, ThreadPriority priority);
duke@435	335	static OSReturn get_priority(const Thread* const thread, ThreadPriority& priority);
duke@435	336
duke@435	337	static void interrupt(Thread* thread);
duke@435	338	static bool is_interrupted(Thread* thread, bool clear_interrupted);
duke@435	339
duke@435	340	static int pd_self_suspend_thread(Thread* thread);
duke@435	341
duke@435	342	static ExtendedPC fetch_frame_from_context(void* ucVoid, intptr_t** sp, intptr_t** fp);
duke@435	343	static frame fetch_frame_from_context(void* ucVoid);
duke@435	344
duke@435	345	static ExtendedPC get_thread_pc(Thread *thread);
duke@435	346	static void breakpoint();
duke@435	347
duke@435	348	static address current_stack_pointer();
duke@435	349	static address current_stack_base();
duke@435	350	static size_t current_stack_size();
duke@435	351
duke@435	352	static int message_box(const char* title, const char* message);
duke@435	353	static char* do_you_want_to_debug(const char* message);
duke@435	354
duke@435	355	// run cmd in a separate process and return its exit code; or -1 on failures
duke@435	356	static int fork_and_exec(char *cmd);
duke@435	357
duke@435	358	// Set file to send error reports.
duke@435	359	static void set_error_file(const char *logfile);
duke@435	360
duke@435	361	// os::exit() is merged with vm_exit()
duke@435	362	// static void exit(int num);
duke@435	363
duke@435	364	// Terminate the VM, but don't exit the process
duke@435	365	static void shutdown();
duke@435	366
duke@435	367	// Terminate with an error. Default is to generate a core file on platforms
duke@435	368	// that support such things. This calls shutdown() and then aborts.
duke@435	369	static void abort(bool dump_core = true);
duke@435	370
duke@435	371	// Die immediately, no exit hook, no abort hook, no cleanup.
duke@435	372	static void die();
duke@435	373
duke@435	374	// Reading directories.
duke@435	375	static DIR* opendir(const char* dirname);
duke@435	376	static int readdir_buf_size(const char *path);
duke@435	377	static struct dirent* readdir(DIR* dirp, dirent* dbuf);
duke@435	378	static int closedir(DIR* dirp);
duke@435	379
duke@435	380	// Dynamic library extension
duke@435	381	static const char* dll_file_extension();
duke@435	382
duke@435	383	static const char* get_temp_directory();
duke@435	384	static const char* get_current_directory(char *buf, int buflen);
duke@435	385
duke@435	386	// Symbol lookup, find nearest function name; basically it implements
duke@435	387	// dladdr() for all platforms. Name of the nearest function is copied
duke@435	388	// to buf. Distance from its base address is returned as offset.
duke@435	389	// If function name is not found, buf[0] is set to '\0' and offset is
duke@435	390	// set to -1.
duke@435	391	static bool dll_address_to_function_name(address addr, char* buf,
duke@435	392	int buflen, int* offset);
duke@435	393
duke@435	394	// Locate DLL/DSO. On success, full path of the library is copied to
duke@435	395	// buf, and offset is set to be the distance between addr and the
duke@435	396	// library's base address. On failure, buf[0] is set to '\0' and
duke@435	397	// offset is set to -1.
duke@435	398	static bool dll_address_to_library_name(address addr, char* buf,
duke@435	399	int buflen, int* offset);
duke@435	400
duke@435	401	// Find out whether the pc is in the static code for jvm.dll/libjvm.so.
duke@435	402	static bool address_is_in_vm(address addr);
duke@435	403
duke@435	404	// Loads .dll/.so and
duke@435	405	// in case of error it checks if .dll/.so was built for the
duke@435	406	// same architecture as Hotspot is running on
duke@435	407	static void* dll_load(const char *name, char *ebuf, int ebuflen);
duke@435	408
duke@435	409	// Print out system information; they are called by fatal error handler.
duke@435	410	// Output format may be different on different platforms.
duke@435	411	static void print_os_info(outputStream* st);
duke@435	412	static void print_cpu_info(outputStream* st);
duke@435	413	static void print_memory_info(outputStream* st);
duke@435	414	static void print_dll_info(outputStream* st);
duke@435	415	static void print_environment_variables(outputStream* st, const char** env_list, char* buffer, int len);
duke@435	416	static void print_context(outputStream* st, void* context);
duke@435	417	static void print_siginfo(outputStream* st, void* siginfo);
duke@435	418	static void print_signal_handlers(outputStream* st, char* buf, size_t buflen);
duke@435	419	static void print_date_and_time(outputStream* st);
duke@435	420
duke@435	421	// The following two functions are used by fatal error handler to trace
duke@435	422	// native (C) frames. They are not part of frame.hpp/frame.cpp because
duke@435	423	// frame.hpp/cpp assume thread is JavaThread, and also because different
duke@435	424	// OS/compiler may have different convention or provide different API to
duke@435	425	// walk C frames.
duke@435	426	//
duke@435	427	// We don't attempt to become a debugger, so we only follow frames if that
duke@435	428	// does not require a lookup in the unwind table, which is part of the binary
duke@435	429	// file but may be unsafe to read after a fatal error. So on x86, we can
duke@435	430	// only walk stack if %ebp is used as frame pointer; on ia64, it's not
duke@435	431	// possible to walk C stack without having the unwind table.
duke@435	432	static bool is_first_C_frame(frame *fr);
duke@435	433	static frame get_sender_for_C_frame(frame *fr);
duke@435	434
duke@435	435	// return current frame. pc() and sp() are set to NULL on failure.
duke@435	436	static frame current_frame();
duke@435	437
duke@435	438	static void print_hex_dump(outputStream* st, address start, address end, int unitsize);
duke@435	439
duke@435	440	// returns a string to describe the exception/signal;
duke@435	441	// returns NULL if exception_code is not an OS exception/signal.
duke@435	442	static const char* exception_name(int exception_code, char* buf, size_t buflen);
duke@435	443
duke@435	444	// Returns native Java library, loads if necessary
duke@435	445	static void* native_java_library();
duke@435	446
duke@435	447	// Fills in path to jvm.dll/libjvm.so (this info used to find hpi).
duke@435	448	static void jvm_path(char *buf, jint buflen);
duke@435	449
duke@435	450	// JNI names
duke@435	451	static void print_jni_name_prefix_on(outputStream* st, int args_size);
duke@435	452	static void print_jni_name_suffix_on(outputStream* st, int args_size);
duke@435	453
duke@435	454	// File conventions
duke@435	455	static const char* file_separator();
duke@435	456	static const char* line_separator();
duke@435	457	static const char* path_separator();
duke@435	458
duke@435	459	// Init os specific system properties values
duke@435	460	static void init_system_properties_values();
duke@435	461
duke@435	462	// IO operations, non-JVM_ version.
duke@435	463	static int stat(const char* path, struct stat* sbuf);
duke@435	464	static bool dir_is_empty(const char* path);
duke@435	465
duke@435	466	// IO operations on binary files
duke@435	467	static int create_binary_file(const char* path, bool rewrite_existing);
duke@435	468	static jlong current_file_offset(int fd);
duke@435	469	static jlong seek_to_file_offset(int fd, jlong offset);
duke@435	470
duke@435	471	// Thread Local Storage
duke@435	472	static int allocate_thread_local_storage();
duke@435	473	static void thread_local_storage_at_put(int index, void* value);
duke@435	474	static void* thread_local_storage_at(int index);
duke@435	475	static void free_thread_local_storage(int index);
duke@435	476
duke@435	477	// General allocation (must be MT-safe)
duke@435	478	static void* malloc (size_t size);
duke@435	479	static void* realloc (void *memblock, size_t size);
duke@435	480	static void free (void *memblock);
duke@435	481	static bool check_heap(bool force = false); // verify C heap integrity
duke@435	482	static char* strdup(const char *); // Like strdup
duke@435	483
duke@435	484	#ifndef PRODUCT
duke@435	485	static int num_mallocs; // # of calls to malloc/realloc
duke@435	486	static size_t alloc_bytes; // # of bytes allocated
duke@435	487	static int num_frees; // # of calls to free
duke@435	488	#endif
duke@435	489
duke@435	490	// Printing 64 bit integers
duke@435	491	static const char* jlong_format_specifier();
duke@435	492	static const char* julong_format_specifier();
duke@435	493
duke@435	494	// Support for signals (see JVM_RaiseSignal, JVM_RegisterSignal)
duke@435	495	static void signal_init();
duke@435	496	static void signal_init_pd();
duke@435	497	static void signal_notify(int signal_number);
duke@435	498	static void* signal(int signal_number, void* handler);
duke@435	499	static void signal_raise(int signal_number);
duke@435	500	static int signal_wait();
duke@435	501	static int signal_lookup();
duke@435	502	static void* user_handler();
duke@435	503	static void terminate_signal_thread();
duke@435	504	static int sigexitnum_pd();
duke@435	505
duke@435	506	// random number generation
duke@435	507	static long random(); // return 32bit pseudorandom number
duke@435	508	static void init_random(long initval); // initialize random sequence
duke@435	509
duke@435	510	// Structured OS Exception support
duke@435	511	static void os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread);
duke@435	512
duke@435	513	// JVMTI & JVM monitoring and management support
duke@435	514	// The thread_cpu_time() and current_thread_cpu_time() are only
duke@435	515	// supported if is_thread_cpu_time_supported() returns true.
duke@435	516	// They are not supported on Solaris T1.
duke@435	517
duke@435	518	// Thread CPU Time - return the fast estimate on a platform
duke@435	519	// On Solaris - call gethrvtime (fast) - user time only
duke@435	520	// On Linux - fast clock_gettime where available - user+sys
duke@435	521	// - otherwise: very slow /proc fs - user+sys
duke@435	522	// On Windows - GetThreadTimes - user+sys
duke@435	523	static jlong current_thread_cpu_time();
duke@435	524	static jlong thread_cpu_time(Thread* t);
duke@435	525
duke@435	526	// Thread CPU Time with user_sys_cpu_time parameter.
duke@435	527	//
duke@435	528	// If user_sys_cpu_time is true, user+sys time is returned.
duke@435	529	// Otherwise, only user time is returned
duke@435	530	static jlong current_thread_cpu_time(bool user_sys_cpu_time);
duke@435	531	static jlong thread_cpu_time(Thread* t, bool user_sys_cpu_time);
duke@435	532
duke@435	533	// Return a bunch of info about the timers.
duke@435	534	// Note that the returned info for these two functions may be different
duke@435	535	// on some platforms
duke@435	536	static void current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr);
duke@435	537	static void thread_cpu_time_info(jvmtiTimerInfo *info_ptr);
duke@435	538
duke@435	539	static bool is_thread_cpu_time_supported();
duke@435	540
duke@435	541	// System loadavg support. Returns -1 if load average cannot be obtained.
duke@435	542	static int loadavg(double loadavg[], int nelem);
duke@435	543
duke@435	544	// Hook for os specific jvm options that we don't want to abort on seeing
duke@435	545	static bool obsolete_option(const JavaVMOption *option);
duke@435	546
duke@435	547	// Platform dependent stuff
duke@435	548	#include "incls/_os_pd.hpp.incl"
duke@435	549
duke@435	550	// debugging support (mostly used by debug.cpp)
duke@435	551	static bool find(address pc) PRODUCT_RETURN0; // OS specific function to make sense out of an address
duke@435	552
duke@435	553	static bool dont_yield(); // when true, JVM_Yield() is nop
duke@435	554	static void print_statistics();
duke@435	555
duke@435	556	// Thread priority helpers (implemented in OS-specific part)
duke@435	557	static OSReturn set_native_priority(Thread* thread, int native_prio);
duke@435	558	static OSReturn get_native_priority(const Thread* const thread, int* priority_ptr);
duke@435	559	static int java_to_os_priority[MaxPriority + 1];
duke@435	560	// Hint to the underlying OS that a task switch would not be good.
duke@435	561	// Void return because it's a hint and can fail.
duke@435	562	static void hint_no_preempt();
duke@435	563
duke@435	564	// Used at creation if requested by the diagnostic flag PauseAtStartup.
duke@435	565	// Causes the VM to wait until an external stimulus has been applied
duke@435	566	// (for Unix, that stimulus is a signal, for Windows, an external
duke@435	567	// ResumeThread call)
duke@435	568	static void pause();
duke@435	569
duke@435	570	protected:
duke@435	571	static long _rand_seed; // seed for random number generator
duke@435	572	static int _processor_count; // number of processors
duke@435	573
duke@435	574	static char* format_boot_path(const char* format_string,
duke@435	575	const char* home,
duke@435	576	int home_len,
duke@435	577	char fileSep,
duke@435	578	char pathSep);
duke@435	579	static bool set_boot_path(char fileSep, char pathSep);
duke@435	580	};
duke@435	581
duke@435	582	// Note that "PAUSE" is almost always used with synchronization
duke@435	583	// so arguably we should provide Atomic::SpinPause() instead
duke@435	584	// of the global SpinPause() with C linkage.
duke@435	585	// It'd also be eligible for inlining on many platforms.
duke@435	586
duke@435	587	extern "C" int SpinPause () ;
duke@435	588	extern "C" int SafeFetch32 (int * adr, int errValue) ;
duke@435	589	extern "C" intptr_t SafeFetchN (intptr_t * adr, intptr_t errValue) ;