• file
• revisions
• annotate
• diff
• comparison
• raw

src/share/vm/runtime/os.hpp@b20d64f83668 (annotated)

src/share/vm/runtime/os.hpp

Mon, 24 Oct 2011 07:53:17 -0700

author

twisti

date

Mon, 24 Oct 2011 07:53:17 -0700

changeset 3238

b20d64f83668

parent 3202

436b4a3231bf

child 3344

11c26bfcf8c7

permissions

-rw-r--r--

7090904: JSR 292: JRuby junit test crashes in PSScavengeRootsClosure::do_oop
Reviewed-by: kvn, never, jrose

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