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src/share/vm/runtime/os.hpp@0a10d80352d5 (annotated)

src/share/vm/runtime/os.hpp

Fri, 27 Jan 2012 09:04:57 +0100

author

brutisso

date

Fri, 27 Jan 2012 09:04:57 +0100

changeset 3467

0a10d80352d5

parent 3384

2b3acb34791f

child 3481

de268c8a8075

permissions

-rw-r--r--

Merge

duke@435	1	/*
ctornqvi@2520	2	* Copyright (c) 1997, 2011, Oracle and/or its affiliates. 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	*
trims@1907	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907	20	* or visit www.oracle.com if you need additional information or have any
trims@1907	21	* questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
stefank@2314	25	#ifndef SHARE_VM_RUNTIME_OS_HPP
stefank@2314	26	#define SHARE_VM_RUNTIME_OS_HPP
stefank@2314	27
stefank@2314	28	#include "jvmtifiles/jvmti.h"
stefank@2314	29	#include "runtime/atomic.hpp"
stefank@2314	30	#include "runtime/extendedPC.hpp"
stefank@2314	31	#include "runtime/handles.hpp"
stefank@2314	32	#include "utilities/top.hpp"
stefank@2314	33	#ifdef TARGET_OS_FAMILY_linux
stefank@2314	34	# include "jvm_linux.h"
stefank@2314	35	#endif
stefank@2314	36	#ifdef TARGET_OS_FAMILY_solaris
stefank@2314	37	# include "jvm_solaris.h"
stefank@2314	38	#endif
stefank@2314	39	#ifdef TARGET_OS_FAMILY_windows
stefank@2314	40	# include "jvm_windows.h"
stefank@2314	41	#endif
never@3156	42	#ifdef TARGET_OS_FAMILY_bsd
never@3156	43	# include "jvm_bsd.h"
never@3156	44	#endif
stefank@2314	45
duke@435	46	// os defines the interface to operating system; this includes traditional
duke@435	47	// OS services (time, I/O) as well as other functionality with system-
duke@435	48	// dependent code.
duke@435	49
duke@435	50	typedef void (*dll_func)(...);
duke@435	51
duke@435	52	class Thread;
duke@435	53	class JavaThread;
duke@435	54	class Event;
duke@435	55	class DLL;
duke@435	56	class FileHandle;
iveresov@576	57	template<class E> class GrowableArray;
duke@435	58
duke@435	59	// %%%%% Moved ThreadState, START_FN, OSThread to new osThread.hpp. -- Rose
duke@435	60
duke@435	61	// Platform-independent error return values from OS functions
duke@435	62	enum OSReturn {
duke@435	63	OS_OK = 0, // Operation was successful
duke@435	64	OS_ERR = -1, // Operation failed
duke@435	65	OS_INTRPT = -2, // Operation was interrupted
duke@435	66	OS_TIMEOUT = -3, // Operation timed out
duke@435	67	OS_NOMEM = -5, // Operation failed for lack of memory
duke@435	68	OS_NORESOURCE = -6 // Operation failed for lack of nonmemory resource
duke@435	69	};
duke@435	70
duke@435	71	enum ThreadPriority { // JLS 20.20.1-3
duke@435	72	NoPriority = -1, // Initial non-priority value
duke@435	73	MinPriority = 1, // Minimum priority
duke@435	74	NormPriority = 5, // Normal (non-daemon) priority
duke@435	75	NearMaxPriority = 9, // High priority, used for VMThread
duke@435	76	MaxPriority = 10 // Highest priority, used for WatcherThread
duke@435	77	// ensures that VMThread doesn't starve profiler
duke@435	78	};
duke@435	79
duke@435	80	// Typedef for structured exception handling support
duke@435	81	typedef void (*java_call_t)(JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread);
duke@435	82
duke@435	83	class os: AllStatic {
phh@1558	84	public:
duke@435	85	enum { page_sizes_max = 9 }; // Size of _page_sizes array (8 plus a sentinel)
duke@435	86
phh@1558	87	private:
duke@435	88	static OSThread* _starting_thread;
duke@435	89	static address _polling_page;
duke@435	90	static volatile int32_t * _mem_serialize_page;
duke@435	91	static uintptr_t _serialize_page_mask;
phh@1558	92	public:
duke@435	93	static size_t _page_sizes[page_sizes_max];
duke@435	94
phh@1558	95	private:
duke@435	96	static void init_page_sizes(size_t default_page_size) {
duke@435	97	_page_sizes[0] = default_page_size;
duke@435	98	_page_sizes[1] = 0; // sentinel
duke@435	99	}
duke@435	100
duke@435	101	public:
bobv@2036	102	static void init(void); // Called before command line parsing
bobv@2036	103	static jint init_2(void); // Called after command line parsing
phh@3378	104	static void init_globals(void) { // Called from init_globals() in init.cpp
phh@3378	105	init_globals_ext();
phh@3378	106	}
bobv@2036	107	static void init_3(void); // Called at the end of vm init
duke@435	108
duke@435	109	// File names are case-insensitive on windows only
duke@435	110	// Override me as needed
duke@435	111	static int file_name_strcmp(const char* s1, const char* s2);
duke@435	112
duke@435	113	static bool getenv(const char* name, char* buffer, int len);
duke@435	114	static bool have_special_privileges();
duke@435	115
duke@435	116	static jlong javaTimeMillis();
duke@435	117	static jlong javaTimeNanos();
duke@435	118	static void javaTimeNanos_info(jvmtiTimerInfo *info_ptr);
duke@435	119	static void run_periodic_checks();
duke@435	120
duke@435	121
duke@435	122	// Returns the elapsed time in seconds since the vm started.
duke@435	123	static double elapsedTime();
duke@435	124
duke@435	125	// Returns real time in seconds since an arbitrary point
duke@435	126	// in the past.
duke@435	127	static bool getTimesSecs(double* process_real_time,
duke@435	128	double* process_user_time,
duke@435	129	double* process_system_time);
duke@435	130
duke@435	131	// Interface to the performance counter
duke@435	132	static jlong elapsed_counter();
duke@435	133	static jlong elapsed_frequency();
duke@435	134
ysr@777	135	// The "virtual time" of a thread is the amount of time a thread has
ysr@777	136	// actually run. The first function indicates whether the OS supports
ysr@777	137	// this functionality for the current thread, and if so:
ysr@777	138	// * the second enables vtime tracking (if that is required).
ysr@777	139	// * the third tells whether vtime is enabled.
ysr@777	140	// * the fourth returns the elapsed virtual time for the current
ysr@777	141	// thread.
ysr@777	142	static bool supports_vtime();
ysr@777	143	static bool enable_vtime();
ysr@777	144	static bool vtime_enabled();
ysr@777	145	static double elapsedVTime();
ysr@777	146
duke@435	147	// Return current local time in a string (YYYY-MM-DD HH:MM:SS).
duke@435	148	// It is MT safe, but not async-safe, as reading time zone
duke@435	149	// information may require a lock on some platforms.
ysr@983	150	static char* local_time_string(char *buf, size_t buflen);
ysr@983	151	static struct tm* localtime_pd (const time_t* clock, struct tm* res);
duke@435	152	// Fill in buffer with current local time as an ISO-8601 string.
duke@435	153	// E.g., YYYY-MM-DDThh:mm:ss.mmm+zzzz.
duke@435	154	// Returns buffer, or NULL if it failed.
duke@435	155	static char* iso8601_time(char* buffer, size_t buffer_length);
duke@435	156
duke@435	157	// Interface for detecting multiprocessor system
duke@435	158	static inline bool is_MP() {
duke@435	159	assert(_processor_count > 0, "invalid processor count");
duke@435	160	return _processor_count > 1;
duke@435	161	}
duke@435	162	static julong available_memory();
duke@435	163	static julong physical_memory();
duke@435	164	static julong allocatable_physical_memory(julong size);
duke@435	165	static bool is_server_class_machine();
duke@435	166
duke@435	167	// number of CPUs
duke@435	168	static int processor_count() {
duke@435	169	return _processor_count;
duke@435	170	}
phh@1558	171	static void set_processor_count(int count) { _processor_count = count; }
duke@435	172
duke@435	173	// Returns the number of CPUs this process is currently allowed to run on.
duke@435	174	// Note that on some OSes this can change dynamically.
duke@435	175	static int active_processor_count();
duke@435	176
duke@435	177	// Bind processes to processors.
duke@435	178	// This is a two step procedure:
duke@435	179	// first you generate a distribution of processes to processors,
duke@435	180	// then you bind processes according to that distribution.
duke@435	181	// Compute a distribution for number of processes to processors.
duke@435	182	// Stores the processor id's into the distribution array argument.
duke@435	183	// Returns true if it worked, false if it didn't.
duke@435	184	static bool distribute_processes(uint length, uint* distribution);
duke@435	185	// Binds the current process to a processor.
duke@435	186	// Returns true if it worked, false if it didn't.
duke@435	187	static bool bind_to_processor(uint processor_id);
duke@435	188
dcubed@3202	189	// Give a name to the current thread.
dcubed@3202	190	static void set_native_thread_name(const char *name);
dcubed@3202	191
duke@435	192	// Interface for stack banging (predetect possible stack overflow for
duke@435	193	// exception processing) There are guard pages, and above that shadow
duke@435	194	// pages for stack overflow checking.
duke@435	195	static bool uses_stack_guard_pages();
duke@435	196	static bool allocate_stack_guard_pages();
duke@435	197	static void bang_stack_shadow_pages();
duke@435	198	static bool stack_shadow_pages_available(Thread *thread, methodHandle method);
duke@435	199
duke@435	200	// OS interface to Virtual Memory
duke@435	201
duke@435	202	// Return the default page size.
duke@435	203	static int vm_page_size();
duke@435	204
duke@435	205	// Return the page size to use for a region of memory. The min_pages argument
duke@435	206	// is a hint intended to limit fragmentation; it says the returned page size
duke@435	207	// should be <= region_max_size / min_pages. Because min_pages is a hint,
duke@435	208	// this routine may return a size larger than region_max_size / min_pages.
duke@435	209	//
duke@435	210	// The current implementation ignores min_pages if a larger page size is an
duke@435	211	// exact multiple of both region_min_size and region_max_size. This allows
duke@435	212	// larger pages to be used when doing so would not cause fragmentation; in
duke@435	213	// particular, a single page can be used when region_min_size ==
duke@435	214	// region_max_size == a supported page size.
duke@435	215	static size_t page_size_for_region(size_t region_min_size,
duke@435	216	size_t region_max_size,
duke@435	217	uint min_pages);
duke@435	218
jcoomes@3057	219	// Methods for tracing page sizes returned by the above method; enabled by
duke@435	220	// TracePageSizes. The region_{min,max}_size parameters should be the values
duke@435	221	// passed to page_size_for_region() and page_size should be the result of that
duke@435	222	// call. The (optional) base and size parameters should come from the
duke@435	223	// ReservedSpace base() and size() methods.
jcoomes@3057	224	static void trace_page_sizes(const char* str, const size_t* page_sizes,
jcoomes@3057	225	int count) PRODUCT_RETURN;
duke@435	226	static void trace_page_sizes(const char* str, const size_t region_min_size,
duke@435	227	const size_t region_max_size,
duke@435	228	const size_t page_size,
duke@435	229	const char* base = NULL,
duke@435	230	const size_t size = 0) PRODUCT_RETURN;
duke@435	231
duke@435	232	static int vm_allocation_granularity();
duke@435	233	static char* reserve_memory(size_t bytes, char* addr = 0,
duke@435	234	size_t alignment_hint = 0);
duke@435	235	static char* attempt_reserve_memory_at(size_t bytes, char* addr);
duke@435	236	static void split_reserved_memory(char *base, size_t size,
duke@435	237	size_t split, bool realloc);
coleenp@1091	238	static bool commit_memory(char* addr, size_t bytes,
coleenp@1091	239	bool executable = false);
coleenp@1091	240	static bool commit_memory(char* addr, size_t size, size_t alignment_hint,
coleenp@1091	241	bool executable = false);
duke@435	242	static bool uncommit_memory(char* addr, size_t bytes);
duke@435	243	static bool release_memory(char* addr, size_t bytes);
coleenp@672	244
coleenp@672	245	enum ProtType { MEM_PROT_NONE, MEM_PROT_READ, MEM_PROT_RW, MEM_PROT_RWX };
coleenp@672	246	static bool protect_memory(char* addr, size_t bytes, ProtType prot,
coleenp@912	247	bool is_committed = true);
coleenp@672	248
duke@435	249	static bool guard_memory(char* addr, size_t bytes);
duke@435	250	static bool unguard_memory(char* addr, size_t bytes);
coleenp@1755	251	static bool create_stack_guard_pages(char* addr, size_t bytes);
coleenp@1755	252	static bool remove_stack_guard_pages(char* addr, size_t bytes);
coleenp@1755	253
duke@435	254	static char* map_memory(int fd, const char* file_name, size_t file_offset,
duke@435	255	char *addr, size_t bytes, bool read_only = false,
duke@435	256	bool allow_exec = false);
duke@435	257	static char* remap_memory(int fd, const char* file_name, size_t file_offset,
duke@435	258	char *addr, size_t bytes, bool read_only,
duke@435	259	bool allow_exec);
duke@435	260	static bool unmap_memory(char *addr, size_t bytes);
iveresov@3363	261	static void free_memory(char *addr, size_t bytes, size_t alignment_hint);
duke@435	262	static void realign_memory(char *addr, size_t bytes, size_t alignment_hint);
duke@435	263
duke@435	264	// NUMA-specific interface
iveresov@576	265	static bool numa_has_static_binding();
iveresov@576	266	static bool numa_has_group_homing();
iveresov@576	267	static void numa_make_local(char *addr, size_t bytes, int lgrp_hint);
duke@435	268	static void numa_make_global(char *addr, size_t bytes);
duke@435	269	static size_t numa_get_groups_num();
duke@435	270	static size_t numa_get_leaf_groups(int *ids, size_t size);
duke@435	271	static bool numa_topology_changed();
duke@435	272	static int numa_get_group_id();
duke@435	273
duke@435	274	// Page manipulation
duke@435	275	struct page_info {
duke@435	276	size_t size;
duke@435	277	int lgrp_id;
duke@435	278	};
duke@435	279	static bool get_page_info(char *start, page_info* info);
duke@435	280	static char* scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found);
duke@435	281
duke@435	282	static char* non_memory_address_word();
duke@435	283	// reserve, commit and pin the entire memory region
coleenp@1091	284	static char* reserve_memory_special(size_t size, char* addr = NULL,
coleenp@1091	285	bool executable = false);
duke@435	286	static bool release_memory_special(char* addr, size_t bytes);
iveresov@2850	287	static void large_page_init();
duke@435	288	static size_t large_page_size();
duke@435	289	static bool can_commit_large_page_memory();
jcoomes@514	290	static bool can_execute_large_page_memory();
duke@435	291
duke@435	292	// OS interface to polling page
duke@435	293	static address get_polling_page() { return _polling_page; }
duke@435	294	static void set_polling_page(address page) { _polling_page = page; }
duke@435	295	static bool is_poll_address(address addr) { return addr >= _polling_page && addr < (_polling_page + os::vm_page_size()); }
duke@435	296	static void make_polling_page_unreadable();
duke@435	297	static void make_polling_page_readable();
duke@435	298
duke@435	299	// Routines used to serialize the thread state without using membars
duke@435	300	static void serialize_thread_states();
duke@435	301
duke@435	302	// Since we write to the serialize page from every thread, we
duke@435	303	// want stores to be on unique cache lines whenever possible
duke@435	304	// in order to minimize CPU cross talk. We pre-compute the
duke@435	305	// amount to shift the thread* to make this offset unique to
duke@435	306	// each thread.
duke@435	307	static int get_serialize_page_shift_count() {
duke@435	308	return SerializePageShiftCount;
duke@435	309	}
duke@435	310
duke@435	311	static void set_serialize_page_mask(uintptr_t mask) {
duke@435	312	_serialize_page_mask = mask;
duke@435	313	}
duke@435	314
duke@435	315	static unsigned int get_serialize_page_mask() {
duke@435	316	return _serialize_page_mask;
duke@435	317	}
duke@435	318
duke@435	319	static void set_memory_serialize_page(address page);
duke@435	320
duke@435	321	static address get_memory_serialize_page() {
duke@435	322	return (address)_mem_serialize_page;
duke@435	323	}
duke@435	324
duke@435	325	static inline void write_memory_serialize_page(JavaThread *thread) {
duke@435	326	uintptr_t page_offset = ((uintptr_t)thread >>
duke@435	327	get_serialize_page_shift_count()) &
duke@435	328	get_serialize_page_mask();
duke@435	329	*(volatile int32_t *)((uintptr_t)_mem_serialize_page+page_offset) = 1;
duke@435	330	}
duke@435	331
duke@435	332	static bool is_memory_serialize_page(JavaThread *thread, address addr) {
duke@435	333	if (UseMembar) return false;
twisti@1513	334	// Previously this function calculated the exact address of this
twisti@1513	335	// thread's serialize page, and checked if the faulting address
twisti@1513	336	// was equal. However, some platforms mask off faulting addresses
twisti@1513	337	// to the page size, so now we just check that the address is
twisti@1513	338	// within the page. This makes the thread argument unnecessary,
twisti@1513	339	// but we retain the NULL check to preserve existing behaviour.
duke@435	340	if (thread == NULL) return false;
twisti@1513	341	address page = (address) _mem_serialize_page;
twisti@1513	342	return addr >= page && addr < (page + os::vm_page_size());
duke@435	343	}
duke@435	344
duke@435	345	static void block_on_serialize_page_trap();
duke@435	346
duke@435	347	// threads
duke@435	348
duke@435	349	enum ThreadType {
duke@435	350	vm_thread,
duke@435	351	cgc_thread, // Concurrent GC thread
duke@435	352	pgc_thread, // Parallel GC thread
duke@435	353	java_thread,
duke@435	354	compiler_thread,
bobv@2036	355	watcher_thread,
bobv@2036	356	os_thread
duke@435	357	};
duke@435	358
duke@435	359	static bool create_thread(Thread* thread,
duke@435	360	ThreadType thr_type,
duke@435	361	size_t stack_size = 0);
duke@435	362	static bool create_main_thread(JavaThread* thread);
duke@435	363	static bool create_attached_thread(JavaThread* thread);
duke@435	364	static void pd_start_thread(Thread* thread);
duke@435	365	static void start_thread(Thread* thread);
duke@435	366
duke@435	367	static void initialize_thread();
duke@435	368	static void free_thread(OSThread* osthread);
duke@435	369
duke@435	370	// thread id on Linux/64bit is 64bit, on Windows and Solaris, it's 32bit
duke@435	371	static intx current_thread_id();
duke@435	372	static int current_process_id();
duke@435	373	static int sleep(Thread* thread, jlong ms, bool interruptable);
duke@435	374	static int naked_sleep();
duke@435	375	static void infinite_sleep(); // never returns, use with CAUTION
duke@435	376	static void yield(); // Yields to all threads with same priority
duke@435	377	enum YieldResult {
duke@435	378	YIELD_SWITCHED = 1, // caller descheduled, other ready threads exist & ran
duke@435	379	YIELD_NONEREADY = 0, // No other runnable/ready threads.
duke@435	380	// platform-specific yield return immediately
duke@435	381	YIELD_UNKNOWN = -1 // Unknown: platform doesn't support _SWITCHED or _NONEREADY
duke@435	382	// YIELD_SWITCHED and YIELD_NONREADY imply the platform supports a "strong"
duke@435	383	// yield that can be used in lieu of blocking.
duke@435	384	} ;
duke@435	385	static YieldResult NakedYield () ;
duke@435	386	static void yield_all(int attempts = 0); // Yields to all other threads including lower priority
duke@435	387	static void loop_breaker(int attempts); // called from within tight loops to possibly influence time-sharing
duke@435	388	static OSReturn set_priority(Thread* thread, ThreadPriority priority);
duke@435	389	static OSReturn get_priority(const Thread* const thread, ThreadPriority& priority);
duke@435	390
duke@435	391	static void interrupt(Thread* thread);
duke@435	392	static bool is_interrupted(Thread* thread, bool clear_interrupted);
duke@435	393
duke@435	394	static int pd_self_suspend_thread(Thread* thread);
duke@435	395
duke@435	396	static ExtendedPC fetch_frame_from_context(void* ucVoid, intptr_t** sp, intptr_t** fp);
duke@435	397	static frame fetch_frame_from_context(void* ucVoid);
duke@435	398
duke@435	399	static ExtendedPC get_thread_pc(Thread *thread);
duke@435	400	static void breakpoint();
duke@435	401
duke@435	402	static address current_stack_pointer();
duke@435	403	static address current_stack_base();
duke@435	404	static size_t current_stack_size();
duke@435	405
duke@435	406	static int message_box(const char* title, const char* message);
duke@435	407	static char* do_you_want_to_debug(const char* message);
duke@435	408
duke@435	409	// run cmd in a separate process and return its exit code; or -1 on failures
duke@435	410	static int fork_and_exec(char *cmd);
duke@435	411
duke@435	412	// Set file to send error reports.
duke@435	413	static void set_error_file(const char *logfile);
duke@435	414
duke@435	415	// os::exit() is merged with vm_exit()
duke@435	416	// static void exit(int num);
duke@435	417
duke@435	418	// Terminate the VM, but don't exit the process
duke@435	419	static void shutdown();
duke@435	420
duke@435	421	// Terminate with an error. Default is to generate a core file on platforms
duke@435	422	// that support such things. This calls shutdown() and then aborts.
duke@435	423	static void abort(bool dump_core = true);
duke@435	424
duke@435	425	// Die immediately, no exit hook, no abort hook, no cleanup.
duke@435	426	static void die();
duke@435	427
ikrylov@2322	428	// File i/o operations
ikrylov@2322	429	static const int default_file_open_flags();
ikrylov@2322	430	static int open(const char *path, int oflag, int mode);
ikrylov@2322	431	static int close(int fd);
ikrylov@2322	432	static jlong lseek(int fd, jlong offset, int whence);
ikrylov@2322	433	static char* native_path(char *path);
ikrylov@2322	434	static int ftruncate(int fd, jlong length);
ikrylov@2322	435	static int fsync(int fd);
ikrylov@2322	436	static int available(int fd, jlong *bytes);
ikrylov@2322	437
ikrylov@2322	438	//File i/o operations
ikrylov@2322	439
ikrylov@2322	440	static size_t read(int fd, void *buf, unsigned int nBytes);
ikrylov@2322	441	static size_t restartable_read(int fd, void *buf, unsigned int nBytes);
ikrylov@2322	442	static size_t write(int fd, const void *buf, unsigned int nBytes);
ikrylov@2322	443
duke@435	444	// Reading directories.
duke@435	445	static DIR* opendir(const char* dirname);
duke@435	446	static int readdir_buf_size(const char *path);
duke@435	447	static struct dirent* readdir(DIR* dirp, dirent* dbuf);
duke@435	448	static int closedir(DIR* dirp);
duke@435	449
duke@435	450	// Dynamic library extension
duke@435	451	static const char* dll_file_extension();
duke@435	452
duke@435	453	static const char* get_temp_directory();
duke@435	454	static const char* get_current_directory(char *buf, int buflen);
duke@435	455
kamg@677	456	// Builds a platform-specific full library path given a ld path and lib name
kamg@677	457	static void dll_build_name(char* buffer, size_t size,
kamg@677	458	const char* pathname, const char* fname);
kamg@677	459
duke@435	460	// Symbol lookup, find nearest function name; basically it implements
duke@435	461	// dladdr() for all platforms. Name of the nearest function is copied
duke@435	462	// to buf. Distance from its base address is returned as offset.
duke@435	463	// If function name is not found, buf[0] is set to '\0' and offset is
duke@435	464	// set to -1.
duke@435	465	static bool dll_address_to_function_name(address addr, char* buf,
duke@435	466	int buflen, int* offset);
duke@435	467
duke@435	468	// Locate DLL/DSO. On success, full path of the library is copied to
duke@435	469	// buf, and offset is set to be the distance between addr and the
duke@435	470	// library's base address. On failure, buf[0] is set to '\0' and
duke@435	471	// offset is set to -1.
duke@435	472	static bool dll_address_to_library_name(address addr, char* buf,
duke@435	473	int buflen, int* offset);
duke@435	474
duke@435	475	// Find out whether the pc is in the static code for jvm.dll/libjvm.so.
duke@435	476	static bool address_is_in_vm(address addr);
duke@435	477
duke@435	478	// Loads .dll/.so and
duke@435	479	// in case of error it checks if .dll/.so was built for the
duke@435	480	// same architecture as Hotspot is running on
duke@435	481	static void* dll_load(const char *name, char *ebuf, int ebuflen);
duke@435	482
kamg@677	483	// lookup symbol in a shared library
kamg@677	484	static void* dll_lookup(void* handle, const char* name);
kamg@677	485
ikrylov@2322	486	// Unload library
ikrylov@2322	487	static void dll_unload(void *lib);
ikrylov@2322	488
duke@435	489	// Print out system information; they are called by fatal error handler.
duke@435	490	// Output format may be different on different platforms.
duke@435	491	static void print_os_info(outputStream* st);
duke@435	492	static void print_cpu_info(outputStream* st);
jcoomes@2997	493	static void pd_print_cpu_info(outputStream* st);
duke@435	494	static void print_memory_info(outputStream* st);
duke@435	495	static void print_dll_info(outputStream* st);
duke@435	496	static void print_environment_variables(outputStream* st, const char** env_list, char* buffer, int len);
duke@435	497	static void print_context(outputStream* st, void* context);
never@2262	498	static void print_register_info(outputStream* st, void* context);
duke@435	499	static void print_siginfo(outputStream* st, void* siginfo);
duke@435	500	static void print_signal_handlers(outputStream* st, char* buf, size_t buflen);
duke@435	501	static void print_date_and_time(outputStream* st);
duke@435	502
never@2262	503	static void print_location(outputStream* st, intptr_t x, bool verbose = false);
ikrylov@2322	504	static size_t lasterror(char *buf, size_t len);
phh@3379	505	static int get_last_error();
bobv@2036	506
sla@2584	507	// Determines whether the calling process is being debugged by a user-mode debugger.
sla@2584	508	static bool is_debugger_attached();
sla@2584	509
sla@2584	510	// wait for a key press if PauseAtExit is set
sla@2584	511	static void wait_for_keypress_at_exit(void);
sla@2584	512
duke@435	513	// The following two functions are used by fatal error handler to trace
duke@435	514	// native (C) frames. They are not part of frame.hpp/frame.cpp because
duke@435	515	// frame.hpp/cpp assume thread is JavaThread, and also because different
duke@435	516	// OS/compiler may have different convention or provide different API to
duke@435	517	// walk C frames.
duke@435	518	//
duke@435	519	// We don't attempt to become a debugger, so we only follow frames if that
duke@435	520	// does not require a lookup in the unwind table, which is part of the binary
duke@435	521	// file but may be unsafe to read after a fatal error. So on x86, we can
duke@435	522	// only walk stack if %ebp is used as frame pointer; on ia64, it's not
duke@435	523	// possible to walk C stack without having the unwind table.
duke@435	524	static bool is_first_C_frame(frame *fr);
duke@435	525	static frame get_sender_for_C_frame(frame *fr);
duke@435	526
duke@435	527	// return current frame. pc() and sp() are set to NULL on failure.
duke@435	528	static frame current_frame();
duke@435	529
duke@435	530	static void print_hex_dump(outputStream* st, address start, address end, int unitsize);
duke@435	531
duke@435	532	// returns a string to describe the exception/signal;
duke@435	533	// returns NULL if exception_code is not an OS exception/signal.
duke@435	534	static const char* exception_name(int exception_code, char* buf, size_t buflen);
duke@435	535
duke@435	536	// Returns native Java library, loads if necessary
duke@435	537	static void* native_java_library();
duke@435	538
ikrylov@2322	539	// Fills in path to jvm.dll/libjvm.so (used by the Disassembler)
duke@435	540	static void jvm_path(char *buf, jint buflen);
duke@435	541
bobv@2036	542	// Returns true if we are running in a headless jre.
bobv@2036	543	static bool is_headless_jre();
bobv@2036	544
duke@435	545	// JNI names
duke@435	546	static void print_jni_name_prefix_on(outputStream* st, int args_size);
duke@435	547	static void print_jni_name_suffix_on(outputStream* st, int args_size);
duke@435	548
duke@435	549	// File conventions
duke@435	550	static const char* file_separator();
duke@435	551	static const char* line_separator();
duke@435	552	static const char* path_separator();
duke@435	553
duke@435	554	// Init os specific system properties values
duke@435	555	static void init_system_properties_values();
duke@435	556
duke@435	557	// IO operations, non-JVM_ version.
duke@435	558	static int stat(const char* path, struct stat* sbuf);
duke@435	559	static bool dir_is_empty(const char* path);
duke@435	560
duke@435	561	// IO operations on binary files
duke@435	562	static int create_binary_file(const char* path, bool rewrite_existing);
duke@435	563	static jlong current_file_offset(int fd);
duke@435	564	static jlong seek_to_file_offset(int fd, jlong offset);
duke@435	565
duke@435	566	// Thread Local Storage
duke@435	567	static int allocate_thread_local_storage();
duke@435	568	static void thread_local_storage_at_put(int index, void* value);
duke@435	569	static void* thread_local_storage_at(int index);
duke@435	570	static void free_thread_local_storage(int index);
duke@435	571
duke@435	572	// General allocation (must be MT-safe)
duke@435	573	static void* malloc (size_t size);
duke@435	574	static void* realloc (void *memblock, size_t size);
duke@435	575	static void free (void *memblock);
duke@435	576	static bool check_heap(bool force = false); // verify C heap integrity
duke@435	577	static char* strdup(const char *); // Like strdup
duke@435	578
duke@435	579	#ifndef PRODUCT
kvn@2557	580	static julong num_mallocs; // # of calls to malloc/realloc
kvn@2557	581	static julong alloc_bytes; // # of bytes allocated
kvn@2557	582	static julong num_frees; // # of calls to free
kvn@2557	583	static julong free_bytes; // # of bytes freed
duke@435	584	#endif
duke@435	585
ikrylov@2322	586	// SocketInterface (ex HPI SocketInterface )
ikrylov@2322	587	static int socket(int domain, int type, int protocol);
ikrylov@2322	588	static int socket_close(int fd);
ikrylov@2322	589	static int socket_shutdown(int fd, int howto);
phh@3344	590	static int recv(int fd, char* buf, size_t nBytes, uint flags);
phh@3344	591	static int send(int fd, char* buf, size_t nBytes, uint flags);
phh@3344	592	static int raw_send(int fd, char* buf, size_t nBytes, uint flags);
ikrylov@2322	593	static int timeout(int fd, long timeout);
ikrylov@2322	594	static int listen(int fd, int count);
phh@3344	595	static int connect(int fd, struct sockaddr* him, socklen_t len);
phh@3344	596	static int bind(int fd, struct sockaddr* him, socklen_t len);
phh@3344	597	static int accept(int fd, struct sockaddr* him, socklen_t* len);
phh@3344	598	static int recvfrom(int fd, char* buf, size_t nbytes, uint flags,
phh@3344	599	struct sockaddr* from, socklen_t* fromlen);
phh@3344	600	static int get_sock_name(int fd, struct sockaddr* him, socklen_t* len);
phh@3344	601	static int sendto(int fd, char* buf, size_t len, uint flags,
phh@3344	602	struct sockaddr* to, socklen_t tolen);
phh@3344	603	static int socket_available(int fd, jint* pbytes);
ikrylov@2322	604
ikrylov@2322	605	static int get_sock_opt(int fd, int level, int optname,
phh@3344	606	char* optval, socklen_t* optlen);
ikrylov@2322	607	static int set_sock_opt(int fd, int level, int optname,
phh@3344	608	const char* optval, socklen_t optlen);
ikrylov@2322	609	static int get_host_name(char* name, int namelen);
ikrylov@2322	610
phh@3344	611	static struct hostent* get_host_by_name(char* name);
ikrylov@2322	612
duke@435	613	// Printing 64 bit integers
duke@435	614	static const char* jlong_format_specifier();
duke@435	615	static const char* julong_format_specifier();
duke@435	616
duke@435	617	// Support for signals (see JVM_RaiseSignal, JVM_RegisterSignal)
duke@435	618	static void signal_init();
duke@435	619	static void signal_init_pd();
duke@435	620	static void signal_notify(int signal_number);
duke@435	621	static void* signal(int signal_number, void* handler);
duke@435	622	static void signal_raise(int signal_number);
duke@435	623	static int signal_wait();
duke@435	624	static int signal_lookup();
duke@435	625	static void* user_handler();
duke@435	626	static void terminate_signal_thread();
duke@435	627	static int sigexitnum_pd();
duke@435	628
duke@435	629	// random number generation
duke@435	630	static long random(); // return 32bit pseudorandom number
duke@435	631	static void init_random(long initval); // initialize random sequence
duke@435	632
duke@435	633	// Structured OS Exception support
duke@435	634	static void os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread);
duke@435	635
ctornqvi@2520	636	// On Windows this will create an actual minidump, on Linux/Solaris it will simply check core dump limits
ctornqvi@2520	637	static void check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize);
ctornqvi@2520	638
duke@435	639	// JVMTI & JVM monitoring and management support
duke@435	640	// The thread_cpu_time() and current_thread_cpu_time() are only
duke@435	641	// supported if is_thread_cpu_time_supported() returns true.
duke@435	642	// They are not supported on Solaris T1.
duke@435	643
duke@435	644	// Thread CPU Time - return the fast estimate on a platform
duke@435	645	// On Solaris - call gethrvtime (fast) - user time only
duke@435	646	// On Linux - fast clock_gettime where available - user+sys
duke@435	647	// - otherwise: very slow /proc fs - user+sys
duke@435	648	// On Windows - GetThreadTimes - user+sys
duke@435	649	static jlong current_thread_cpu_time();
duke@435	650	static jlong thread_cpu_time(Thread* t);
duke@435	651
duke@435	652	// Thread CPU Time with user_sys_cpu_time parameter.
duke@435	653	//
duke@435	654	// If user_sys_cpu_time is true, user+sys time is returned.
duke@435	655	// Otherwise, only user time is returned
duke@435	656	static jlong current_thread_cpu_time(bool user_sys_cpu_time);
duke@435	657	static jlong thread_cpu_time(Thread* t, bool user_sys_cpu_time);
duke@435	658
duke@435	659	// Return a bunch of info about the timers.
duke@435	660	// Note that the returned info for these two functions may be different
duke@435	661	// on some platforms
duke@435	662	static void current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr);
duke@435	663	static void thread_cpu_time_info(jvmtiTimerInfo *info_ptr);
duke@435	664
duke@435	665	static bool is_thread_cpu_time_supported();
duke@435	666
duke@435	667	// System loadavg support. Returns -1 if load average cannot be obtained.
duke@435	668	static int loadavg(double loadavg[], int nelem);
duke@435	669
duke@435	670	// Hook for os specific jvm options that we don't want to abort on seeing
duke@435	671	static bool obsolete_option(const JavaVMOption *option);
duke@435	672
dsamersoff@2751	673	// Read file line by line. If line is longer than bsize,
dsamersoff@2751	674	// rest of line is skipped. Returns number of bytes read or -1 on EOF
dsamersoff@2751	675	static int get_line_chars(int fd, char *buf, const size_t bsize);
dsamersoff@2751	676
phh@3378	677	// Extensions
phh@3378	678	#include "runtime/os_ext.hpp"
phh@3378	679
phh@3378	680	public:
phh@3378	681
duke@435	682	// Platform dependent stuff
stefank@2314	683	#ifdef TARGET_OS_FAMILY_linux
stefank@2314	684	# include "os_linux.hpp"
stefank@2314	685	#endif
stefank@2314	686	#ifdef TARGET_OS_FAMILY_solaris
stefank@2314	687	# include "os_solaris.hpp"
stefank@2314	688	#endif
stefank@2314	689	#ifdef TARGET_OS_FAMILY_windows
stefank@2314	690	# include "os_windows.hpp"
stefank@2314	691	#endif
never@3156	692	#ifdef TARGET_OS_FAMILY_bsd
never@3156	693	# include "os_bsd.hpp"
never@3156	694	#endif
stefank@2314	695	#ifdef TARGET_OS_ARCH_linux_x86
stefank@2314	696	# include "os_linux_x86.hpp"
stefank@2314	697	#endif
stefank@2314	698	#ifdef TARGET_OS_ARCH_linux_sparc
stefank@2314	699	# include "os_linux_sparc.hpp"
stefank@2314	700	#endif
stefank@2314	701	#ifdef TARGET_OS_ARCH_linux_zero
stefank@2314	702	# include "os_linux_zero.hpp"
stefank@2314	703	#endif
stefank@2314	704	#ifdef TARGET_OS_ARCH_solaris_x86
stefank@2314	705	# include "os_solaris_x86.hpp"
stefank@2314	706	#endif
stefank@2314	707	#ifdef TARGET_OS_ARCH_solaris_sparc
stefank@2314	708	# include "os_solaris_sparc.hpp"
stefank@2314	709	#endif
stefank@2314	710	#ifdef TARGET_OS_ARCH_windows_x86
stefank@2314	711	# include "os_windows_x86.hpp"
stefank@2314	712	#endif
bobv@2508	713	#ifdef TARGET_OS_ARCH_linux_arm
bobv@2508	714	# include "os_linux_arm.hpp"
bobv@2508	715	#endif
bobv@2508	716	#ifdef TARGET_OS_ARCH_linux_ppc
bobv@2508	717	# include "os_linux_ppc.hpp"
bobv@2508	718	#endif
never@3156	719	#ifdef TARGET_OS_ARCH_bsd_x86
never@3156	720	# include "os_bsd_x86.hpp"
never@3156	721	#endif
never@3156	722	#ifdef TARGET_OS_ARCH_bsd_zero
never@3156	723	# include "os_bsd_zero.hpp"
never@3156	724	#endif
stefank@2314	725
phh@3378	726	public:
bobv@2036	727	// debugging support (mostly used by debug.cpp but also fatal error handler)
bobv@2036	728	static bool find(address pc, outputStream* st = tty); // OS specific function to make sense out of an address
duke@435	729
duke@435	730	static bool dont_yield(); // when true, JVM_Yield() is nop
duke@435	731	static void print_statistics();
duke@435	732
duke@435	733	// Thread priority helpers (implemented in OS-specific part)
duke@435	734	static OSReturn set_native_priority(Thread* thread, int native_prio);
duke@435	735	static OSReturn get_native_priority(const Thread* const thread, int* priority_ptr);
duke@435	736	static int java_to_os_priority[MaxPriority + 1];
duke@435	737	// Hint to the underlying OS that a task switch would not be good.
duke@435	738	// Void return because it's a hint and can fail.
duke@435	739	static void hint_no_preempt();
duke@435	740
duke@435	741	// Used at creation if requested by the diagnostic flag PauseAtStartup.
duke@435	742	// Causes the VM to wait until an external stimulus has been applied
duke@435	743	// (for Unix, that stimulus is a signal, for Windows, an external
duke@435	744	// ResumeThread call)
duke@435	745	static void pause();
duke@435	746
duke@435	747	protected:
duke@435	748	static long _rand_seed; // seed for random number generator
duke@435	749	static int _processor_count; // number of processors
duke@435	750
duke@435	751	static char* format_boot_path(const char* format_string,
duke@435	752	const char* home,
duke@435	753	int home_len,
duke@435	754	char fileSep,
duke@435	755	char pathSep);
duke@435	756	static bool set_boot_path(char fileSep, char pathSep);
phh@1126	757	static char** split_path(const char* path, int* n);
duke@435	758	};
duke@435	759
duke@435	760	// Note that "PAUSE" is almost always used with synchronization
duke@435	761	// so arguably we should provide Atomic::SpinPause() instead
duke@435	762	// of the global SpinPause() with C linkage.
duke@435	763	// It'd also be eligible for inlining on many platforms.
duke@435	764
duke@435	765	extern "C" int SpinPause () ;
duke@435	766	extern "C" int SafeFetch32 (int * adr, int errValue) ;
duke@435	767	extern "C" intptr_t SafeFetchN (intptr_t * adr, intptr_t errValue) ;
stefank@2314	768
stefank@2314	769	#endif // SHARE_VM_RUNTIME_OS_HPP