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src/os/linux/vm/os_linux.hpp@53eec13fbaa5 (annotated)

src/os/linux/vm/os_linux.hpp

Thu, 26 Jul 2018 16:04:06 +0800

author

aoqi

date

Thu, 26 Jul 2018 16:04:06 +0800

changeset 9203

53eec13fbaa5

parent 9182

0f31f18d2241

parent 9041

95a08233f46c

child 9448

73d689add964

permissions

-rw-r--r--

Merge

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation.
aoqi@0	8	*
aoqi@0	9	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	12	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	13	* accompanied this code).
aoqi@0	14	*
aoqi@0	15	* You should have received a copy of the GNU General Public License version
aoqi@0	16	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	18	*
aoqi@0	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	20	* or visit www.oracle.com if you need additional information or have any
aoqi@0	21	* questions.
aoqi@0	22	*
aoqi@0	23	*/
aoqi@0	24
aoqi@0	25	#ifndef OS_LINUX_VM_OS_LINUX_HPP
aoqi@0	26	#define OS_LINUX_VM_OS_LINUX_HPP
aoqi@0	27
aoqi@0	28	// Linux_OS defines the interface to Linux operating systems
aoqi@0	29
aoqi@0	30	/* pthread_getattr_np comes with LinuxThreads-0.9-7 on RedHat 7.1 */
aoqi@0	31	typedef int (*pthread_getattr_func_type) (pthread_t, pthread_attr_t *);
aoqi@0	32
aoqi@0	33	// Information about the protection of the page at address '0' on this os.
aoqi@0	34	static bool zero_page_read_protected() { return true; }
aoqi@0	35
aoqi@0	36	class Linux {
aoqi@0	37	friend class os;
aoqi@0	38	friend class TestReserveMemorySpecial;
aoqi@0	39
aoqi@0	40	// For signal-chaining
aoqi@0	41	#define MAXSIGNUM 32
aoqi@0	42	static struct sigaction sigact[MAXSIGNUM]; // saved preinstalled sigactions
aoqi@0	43	static unsigned int sigs; // mask of signals that have
aoqi@0	44	// preinstalled signal handlers
aoqi@0	45	static bool libjsig_is_loaded; // libjsig that interposes sigaction(),
aoqi@0	46	// __sigaction(), signal() is loaded
aoqi@0	47	static struct sigaction *(*get_signal_action)(int);
aoqi@0	48	static struct sigaction *get_preinstalled_handler(int);
aoqi@0	49	static void save_preinstalled_handler(int, struct sigaction&);
aoqi@0	50
aoqi@0	51	static void check_signal_handler(int sig);
aoqi@0	52
aoqi@0	53	// For signal flags diagnostics
aoqi@0	54	static int sigflags[MAXSIGNUM];
aoqi@0	55
aoqi@0	56	static int (*_clock_gettime)(clockid_t, struct timespec *);
aoqi@0	57	static int (*_pthread_getcpuclockid)(pthread_t, clockid_t *);
aoqi@0	58
aoqi@0	59	static address _initial_thread_stack_bottom;
aoqi@0	60	static uintptr_t _initial_thread_stack_size;
aoqi@0	61
aoqi@0	62	static const char *_glibc_version;
aoqi@0	63	static const char *_libpthread_version;
aoqi@0	64
aoqi@0	65	static bool _is_floating_stack;
aoqi@0	66	static bool _is_NPTL;
aoqi@0	67	static bool _supports_fast_thread_cpu_time;
aoqi@0	68
aoqi@0	69	static GrowableArray<int>* _cpu_to_node;
gromero@8776	70	static GrowableArray<int>* _nindex_to_node;
aoqi@0	71
aoqi@0	72	protected:
aoqi@0	73
aoqi@0	74	static julong _physical_memory;
aoqi@0	75	static pthread_t _main_thread;
aoqi@0	76	static Mutex* _createThread_lock;
aoqi@0	77	static int _page_size;
aoqi@0	78	static const int _vm_default_page_size;
aoqi@0	79
aoqi@0	80	static julong available_memory();
aoqi@0	81	static julong physical_memory() { return _physical_memory; }
aoqi@0	82	static void initialize_system_info();
aoqi@0	83
aoqi@0	84	static int commit_memory_impl(char* addr, size_t bytes, bool exec);
aoqi@0	85	static int commit_memory_impl(char* addr, size_t bytes,
aoqi@0	86	size_t alignment_hint, bool exec);
aoqi@0	87
aoqi@0	88	static void set_glibc_version(const char *s) { _glibc_version = s; }
aoqi@0	89	static void set_libpthread_version(const char *s) { _libpthread_version = s; }
aoqi@0	90
aoqi@0	91	static bool supports_variable_stack_size();
aoqi@0	92
aoqi@0	93	static void set_is_NPTL() { _is_NPTL = true; }
aoqi@0	94	static void set_is_LinuxThreads() { _is_NPTL = false; }
aoqi@0	95	static void set_is_floating_stack() { _is_floating_stack = true; }
aoqi@0	96
aoqi@0	97	static void rebuild_cpu_to_node_map();
gromero@8776	98	static void rebuild_nindex_to_node_map();
aoqi@0	99	static GrowableArray<int>* cpu_to_node() { return _cpu_to_node; }
gromero@8776	100	static GrowableArray<int>* nindex_to_node() { return _nindex_to_node; }
aoqi@0	101
aoqi@0	102	static size_t find_large_page_size();
aoqi@0	103	static size_t setup_large_page_size();
aoqi@0	104
aoqi@0	105	static bool setup_large_page_type(size_t page_size);
aoqi@0	106	static bool transparent_huge_pages_sanity_check(bool warn, size_t pages_size);
aoqi@0	107	static bool hugetlbfs_sanity_check(bool warn, size_t page_size);
aoqi@0	108
aoqi@0	109	static char* reserve_memory_special_shm(size_t bytes, size_t alignment, char* req_addr, bool exec);
aoqi@0	110	static char* reserve_memory_special_huge_tlbfs(size_t bytes, size_t alignment, char* req_addr, bool exec);
aoqi@0	111	static char* reserve_memory_special_huge_tlbfs_only(size_t bytes, char* req_addr, bool exec);
aoqi@0	112	static char* reserve_memory_special_huge_tlbfs_mixed(size_t bytes, size_t alignment, char* req_addr, bool exec);
aoqi@0	113
zgu@7074	114	static bool release_memory_special_impl(char* base, size_t bytes);
aoqi@0	115	static bool release_memory_special_shm(char* base, size_t bytes);
aoqi@0	116	static bool release_memory_special_huge_tlbfs(char* base, size_t bytes);
aoqi@0	117
aoqi@0	118	static void print_full_memory_info(outputStream* st);
aoqi@0	119	static void print_distro_info(outputStream* st);
aoqi@0	120	static void print_libversion_info(outputStream* st);
aoqi@0	121
aoqi@0	122	public:
aoqi@0	123	static bool _stack_is_executable;
aoqi@0	124	static void *dlopen_helper(const char *name, char *ebuf, int ebuflen);
aoqi@0	125	static void *dll_load_in_vmthread(const char *name, char *ebuf, int ebuflen);
aoqi@0	126
aoqi@0	127	static void init_thread_fpu_state();
aoqi@0	128	static int get_fpu_control_word();
aoqi@0	129	static void set_fpu_control_word(int fpu_control);
aoqi@0	130	static pthread_t main_thread(void) { return _main_thread; }
aoqi@0	131	// returns kernel thread id (similar to LWP id on Solaris), which can be
aoqi@0	132	// used to access /proc
aoqi@0	133	static pid_t gettid();
aoqi@0	134	static void set_createThread_lock(Mutex* lk) { _createThread_lock = lk; }
aoqi@0	135	static Mutex* createThread_lock(void) { return _createThread_lock; }
aoqi@0	136	static void hotspot_sigmask(Thread* thread);
aoqi@0	137
aoqi@0	138	static address initial_thread_stack_bottom(void) { return _initial_thread_stack_bottom; }
aoqi@0	139	static uintptr_t initial_thread_stack_size(void) { return _initial_thread_stack_size; }
aoqi@0	140	static bool is_initial_thread(void);
aoqi@0	141
aoqi@0	142	static int page_size(void) { return _page_size; }
aoqi@0	143	static void set_page_size(int val) { _page_size = val; }
aoqi@0	144
aoqi@0	145	static int vm_default_page_size(void) { return _vm_default_page_size; }
aoqi@0	146
aoqi@0	147	static address ucontext_get_pc(ucontext_t* uc);
aoqi@0	148	static intptr_t* ucontext_get_sp(ucontext_t* uc);
aoqi@0	149	static intptr_t* ucontext_get_fp(ucontext_t* uc);
aoqi@0	150
aoqi@0	151	// For Analyzer Forte AsyncGetCallTrace profiling support:
aoqi@0	152	//
aoqi@0	153	// This interface should be declared in os_linux_i486.hpp, but
aoqi@0	154	// that file provides extensions to the os class and not the
aoqi@0	155	// Linux class.
aoqi@0	156	static ExtendedPC fetch_frame_from_ucontext(Thread* thread, ucontext_t* uc,
aoqi@0	157	intptr_t** ret_sp, intptr_t** ret_fp);
aoqi@0	158
aoqi@0	159	// This boolean allows users to forward their own non-matching signals
aoqi@0	160	// to JVM_handle_linux_signal, harmlessly.
aoqi@0	161	static bool signal_handlers_are_installed;
aoqi@0	162
aoqi@0	163	static int get_our_sigflags(int);
aoqi@0	164	static void set_our_sigflags(int, int);
aoqi@0	165	static void signal_sets_init();
aoqi@0	166	static void install_signal_handlers();
aoqi@0	167	static void set_signal_handler(int, bool);
aoqi@0	168	static bool is_sig_ignored(int sig);
aoqi@0	169
aoqi@0	170	static sigset_t* unblocked_signals();
aoqi@0	171	static sigset_t* vm_signals();
aoqi@0	172	static sigset_t* allowdebug_blocked_signals();
aoqi@0	173
aoqi@0	174	// For signal-chaining
aoqi@0	175	static struct sigaction *get_chained_signal_action(int sig);
aoqi@0	176	static bool chained_handler(int sig, siginfo_t* siginfo, void* context);
aoqi@0	177
aoqi@0	178	// GNU libc and libpthread version strings
aoqi@0	179	static const char *glibc_version() { return _glibc_version; }
aoqi@0	180	static const char *libpthread_version() { return _libpthread_version; }
aoqi@0	181
aoqi@0	182	// NPTL or LinuxThreads?
aoqi@0	183	static bool is_LinuxThreads() { return !_is_NPTL; }
aoqi@0	184	static bool is_NPTL() { return _is_NPTL; }
aoqi@0	185
aoqi@0	186	// NPTL is always floating stack. LinuxThreads could be using floating
aoqi@0	187	// stack or fixed stack.
aoqi@0	188	static bool is_floating_stack() { return _is_floating_stack; }
aoqi@0	189
aoqi@0	190	static void libpthread_init();
aoqi@0	191	static bool libnuma_init();
aoqi@0	192	static void* libnuma_dlsym(void* handle, const char* name);
zgu@8878	193	// libnuma v2 (libnuma_1.2) symbols
zgu@8878	194	static void* libnuma_v2_dlsym(void* handle, const char* name);
aoqi@0	195	// Minimum stack size a thread can be created with (allowing
aoqi@0	196	// the VM to completely create the thread and enter user code)
aoqi@0	197	static size_t min_stack_allowed;
aoqi@0	198
aoqi@0	199	// Return default stack size or guard size for the specified thread type
aoqi@0	200	static size_t default_stack_size(os::ThreadType thr_type);
aoqi@0	201	static size_t default_guard_size(os::ThreadType thr_type);
aoqi@0	202
aoqi@0	203	static void capture_initial_stack(size_t max_size);
aoqi@0	204
aoqi@0	205	// Stack overflow handling
aoqi@0	206	static bool manually_expand_stack(JavaThread * t, address addr);
aoqi@0	207	static int max_register_window_saves_before_flushing();
aoqi@0	208
aoqi@0	209	// Real-time clock functions
aoqi@0	210	static void clock_init(void);
aoqi@0	211
aoqi@0	212	// fast POSIX clocks support
aoqi@0	213	static void fast_thread_clock_init(void);
aoqi@0	214
aoqi@0	215	static inline bool supports_monotonic_clock() {
aoqi@0	216	return _clock_gettime != NULL;
aoqi@0	217	}
aoqi@0	218
aoqi@0	219	static int clock_gettime(clockid_t clock_id, struct timespec *tp) {
aoqi@0	220	return _clock_gettime ? _clock_gettime(clock_id, tp) : -1;
aoqi@0	221	}
aoqi@0	222
aoqi@0	223	static int pthread_getcpuclockid(pthread_t tid, clockid_t *clock_id) {
aoqi@0	224	return _pthread_getcpuclockid ? _pthread_getcpuclockid(tid, clock_id) : -1;
aoqi@0	225	}
aoqi@0	226
aoqi@0	227	static bool supports_fast_thread_cpu_time() {
aoqi@0	228	return _supports_fast_thread_cpu_time;
aoqi@0	229	}
aoqi@0	230
aoqi@0	231	static jlong fast_thread_cpu_time(clockid_t clockid);
aoqi@0	232
aoqi@0	233	// pthread_cond clock suppport
aoqi@0	234	private:
aoqi@0	235	static pthread_condattr_t _condattr[1];
aoqi@0	236
aoqi@0	237	public:
aoqi@0	238	static pthread_condattr_t* condAttr() { return _condattr; }
aoqi@0	239
aoqi@0	240	// Stack repair handling
aoqi@0	241
aoqi@0	242	// none present
aoqi@0	243
aoqi@0	244	// LinuxThreads work-around for 6292965
aoqi@0	245	static int safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime);
aoqi@0	246
aoqi@0	247	private:
aoqi@0	248	typedef int (*sched_getcpu_func_t)(void);
aoqi@0	249	typedef int (*numa_node_to_cpus_func_t)(int node, unsigned long *buffer, int bufferlen);
aoqi@0	250	typedef int (*numa_max_node_func_t)(void);
gromero@8776	251	typedef int (*numa_num_configured_nodes_func_t)(void);
aoqi@0	252	typedef int (*numa_available_func_t)(void);
aoqi@0	253	typedef int (*numa_tonode_memory_func_t)(void *start, size_t size, int node);
aoqi@0	254	typedef void (*numa_interleave_memory_func_t)(void *start, size_t size, unsigned long *nodemask);
zgu@8878	255	typedef void (*numa_interleave_memory_v2_func_t)(void *start, size_t size, struct bitmask* mask);
zgu@8878	256
aoqi@0	257	typedef void (*numa_set_bind_policy_func_t)(int policy);
gromero@8776	258	typedef int (*numa_bitmask_isbitset_func_t)(struct bitmask *bmp, unsigned int n);
gromero@8776	259	typedef int (*numa_distance_func_t)(int node1, int node2);
aoqi@0	260
aoqi@0	261	static sched_getcpu_func_t _sched_getcpu;
aoqi@0	262	static numa_node_to_cpus_func_t _numa_node_to_cpus;
aoqi@0	263	static numa_max_node_func_t _numa_max_node;
gromero@8776	264	static numa_num_configured_nodes_func_t _numa_num_configured_nodes;
aoqi@0	265	static numa_available_func_t _numa_available;
aoqi@0	266	static numa_tonode_memory_func_t _numa_tonode_memory;
aoqi@0	267	static numa_interleave_memory_func_t _numa_interleave_memory;
zgu@8878	268	static numa_interleave_memory_v2_func_t _numa_interleave_memory_v2;
aoqi@0	269	static numa_set_bind_policy_func_t _numa_set_bind_policy;
gromero@8776	270	static numa_bitmask_isbitset_func_t _numa_bitmask_isbitset;
gromero@8776	271	static numa_distance_func_t _numa_distance;
aoqi@0	272	static unsigned long* _numa_all_nodes;
gromero@8776	273	static struct bitmask* _numa_all_nodes_ptr;
gromero@8776	274	static struct bitmask* _numa_nodes_ptr;
aoqi@0	275
aoqi@0	276	static void set_sched_getcpu(sched_getcpu_func_t func) { _sched_getcpu = func; }
aoqi@0	277	static void set_numa_node_to_cpus(numa_node_to_cpus_func_t func) { _numa_node_to_cpus = func; }
aoqi@0	278	static void set_numa_max_node(numa_max_node_func_t func) { _numa_max_node = func; }
gromero@8776	279	static void set_numa_num_configured_nodes(numa_num_configured_nodes_func_t func) { _numa_num_configured_nodes = func; }
aoqi@0	280	static void set_numa_available(numa_available_func_t func) { _numa_available = func; }
aoqi@0	281	static void set_numa_tonode_memory(numa_tonode_memory_func_t func) { _numa_tonode_memory = func; }
aoqi@0	282	static void set_numa_interleave_memory(numa_interleave_memory_func_t func) { _numa_interleave_memory = func; }
zgu@8878	283	static void set_numa_interleave_memory_v2(numa_interleave_memory_v2_func_t func) { _numa_interleave_memory_v2 = func; }
aoqi@0	284	static void set_numa_set_bind_policy(numa_set_bind_policy_func_t func) { _numa_set_bind_policy = func; }
gromero@8776	285	static void set_numa_bitmask_isbitset(numa_bitmask_isbitset_func_t func) { _numa_bitmask_isbitset = func; }
gromero@8776	286	static void set_numa_distance(numa_distance_func_t func) { _numa_distance = func; }
aoqi@0	287	static void set_numa_all_nodes(unsigned long* ptr) { _numa_all_nodes = ptr; }
gromero@9182	288	static void set_numa_all_nodes_ptr(struct bitmask **ptr) { _numa_all_nodes_ptr = (ptr == NULL ? NULL : *ptr); }
gromero@9182	289	static void set_numa_nodes_ptr(struct bitmask **ptr) { _numa_nodes_ptr = (ptr == NULL ? NULL : *ptr); }
aoqi@0	290	static int sched_getcpu_syscall(void);
aoqi@0	291	public:
aoqi@0	292	static int sched_getcpu() { return _sched_getcpu != NULL ? _sched_getcpu() : -1; }
aoqi@0	293	static int numa_node_to_cpus(int node, unsigned long *buffer, int bufferlen) {
aoqi@0	294	return _numa_node_to_cpus != NULL ? _numa_node_to_cpus(node, buffer, bufferlen) : -1;
aoqi@0	295	}
aoqi@0	296	static int numa_max_node() { return _numa_max_node != NULL ? _numa_max_node() : -1; }
gromero@8776	297	static int numa_num_configured_nodes() {
gromero@8776	298	return _numa_num_configured_nodes != NULL ? _numa_num_configured_nodes() : -1;
gromero@8776	299	}
aoqi@0	300	static int numa_available() { return _numa_available != NULL ? _numa_available() : -1; }
aoqi@0	301	static int numa_tonode_memory(void *start, size_t size, int node) {
aoqi@0	302	return _numa_tonode_memory != NULL ? _numa_tonode_memory(start, size, node) : -1;
aoqi@0	303	}
aoqi@0	304	static void numa_interleave_memory(void *start, size_t size) {
zgu@8878	305	// Use v2 api if available
zgu@8878	306	if (_numa_interleave_memory_v2 != NULL && _numa_all_nodes_ptr != NULL) {
zgu@8878	307	_numa_interleave_memory_v2(start, size, _numa_all_nodes_ptr);
zgu@8878	308	} else if (_numa_interleave_memory != NULL && _numa_all_nodes != NULL) {
aoqi@0	309	_numa_interleave_memory(start, size, _numa_all_nodes);
aoqi@0	310	}
aoqi@0	311	}
aoqi@0	312	static void numa_set_bind_policy(int policy) {
aoqi@0	313	if (_numa_set_bind_policy != NULL) {
aoqi@0	314	_numa_set_bind_policy(policy);
aoqi@0	315	}
aoqi@0	316	}
gromero@8776	317	static int numa_distance(int node1, int node2) {
gromero@8776	318	return _numa_distance != NULL ? _numa_distance(node1, node2) : -1;
gromero@8776	319	}
aoqi@0	320	static int get_node_by_cpu(int cpu_id);
gromero@8776	321	static int get_existing_num_nodes();
gromero@8776	322	// Check if numa node is configured (non-zero memory node).
gromero@8776	323	static bool isnode_in_configured_nodes(unsigned int n) {
gromero@8776	324	if (_numa_bitmask_isbitset != NULL && _numa_all_nodes_ptr != NULL) {
gromero@8776	325	return _numa_bitmask_isbitset(_numa_all_nodes_ptr, n);
gromero@8776	326	} else
gromero@8776	327	return 0;
gromero@8776	328	}
gromero@8776	329	// Check if numa node exists in the system (including zero memory nodes).
gromero@8776	330	static bool isnode_in_existing_nodes(unsigned int n) {
gromero@8776	331	if (_numa_bitmask_isbitset != NULL && _numa_nodes_ptr != NULL) {
gromero@8776	332	return _numa_bitmask_isbitset(_numa_nodes_ptr, n);
gromero@9182	333	} else if (_numa_bitmask_isbitset != NULL && _numa_all_nodes_ptr != NULL) {
gromero@9182	334	// Not all libnuma API v2 implement numa_nodes_ptr, so it's not possible
gromero@9182	335	// to trust the API version for checking its absence. On the other hand,
gromero@9182	336	// numa_nodes_ptr found in libnuma 2.0.9 and above is the only way to get
gromero@9182	337	// a complete view of all numa nodes in the system, hence numa_nodes_ptr
gromero@9182	338	// is used to handle CPU and nodes on architectures (like PowerPC) where
gromero@9182	339	// there can exist nodes with CPUs but no memory or vice-versa and the
gromero@9182	340	// nodes may be non-contiguous. For most of the architectures, like
gromero@9182	341	// x86_64, numa_node_ptr presents the same node set as found in
gromero@9182	342	// numa_all_nodes_ptr so it's possible to use numa_all_nodes_ptr as a
gromero@9182	343	// substitute.
gromero@9182	344	return _numa_bitmask_isbitset(_numa_all_nodes_ptr, n);
gromero@8776	345	} else
gromero@8776	346	return 0;
gromero@8776	347	}
aoqi@0	348	};
aoqi@0	349
aoqi@0	350
aoqi@0	351	class PlatformEvent : public CHeapObj<mtInternal> {
aoqi@0	352	private:
aoqi@0	353	double CachePad [4] ; // increase odds that _mutex is sole occupant of cache line
aoqi@0	354	volatile int _Event ;
aoqi@0	355	volatile int _nParked ;
aoqi@0	356	pthread_mutex_t _mutex [1] ;
aoqi@0	357	pthread_cond_t _cond [1] ;
aoqi@0	358	double PostPad [2] ;
aoqi@0	359	Thread * _Assoc ;
aoqi@0	360
aoqi@0	361	public: // TODO-FIXME: make dtor private
aoqi@0	362	~PlatformEvent() { guarantee (0, "invariant") ; }
aoqi@0	363
aoqi@0	364	public:
aoqi@0	365	PlatformEvent() {
aoqi@0	366	int status;
aoqi@0	367	status = pthread_cond_init (_cond, os::Linux::condAttr());
aoqi@0	368	assert_status(status == 0, status, "cond_init");
aoqi@0	369	status = pthread_mutex_init (_mutex, NULL);
aoqi@0	370	assert_status(status == 0, status, "mutex_init");
aoqi@0	371	_Event = 0 ;
aoqi@0	372	_nParked = 0 ;
aoqi@0	373	_Assoc = NULL ;
aoqi@0	374	}
aoqi@0	375
aoqi@0	376	// Use caution with reset() and fired() -- they may require MEMBARs
aoqi@0	377	void reset() { _Event = 0 ; }
aoqi@0	378	int fired() { return _Event; }
aoqi@0	379	void park () ;
aoqi@0	380	void unpark () ;
aoqi@0	381	int TryPark () ;
aoqi@0	382	int park (jlong millis) ; // relative timed-wait only
aoqi@0	383	void SetAssociation (Thread * a) { _Assoc = a ; }
aoqi@0	384	} ;
aoqi@0	385
aoqi@0	386	class PlatformParker : public CHeapObj<mtInternal> {
aoqi@0	387	protected:
aoqi@0	388	enum {
aoqi@0	389	REL_INDEX = 0,
aoqi@0	390	ABS_INDEX = 1
aoqi@0	391	};
aoqi@0	392	int _cur_index; // which cond is in use: -1, 0, 1
aoqi@0	393	pthread_mutex_t _mutex [1] ;
aoqi@0	394	pthread_cond_t _cond [2] ; // one for relative times and one for abs.
aoqi@0	395
aoqi@0	396	public: // TODO-FIXME: make dtor private
aoqi@0	397	~PlatformParker() { guarantee (0, "invariant") ; }
aoqi@0	398
aoqi@0	399	public:
aoqi@0	400	PlatformParker() {
aoqi@0	401	int status;
aoqi@0	402	status = pthread_cond_init (&_cond[REL_INDEX], os::Linux::condAttr());
aoqi@0	403	assert_status(status == 0, status, "cond_init rel");
aoqi@0	404	status = pthread_cond_init (&_cond[ABS_INDEX], NULL);
aoqi@0	405	assert_status(status == 0, status, "cond_init abs");
aoqi@0	406	status = pthread_mutex_init (_mutex, NULL);
aoqi@0	407	assert_status(status == 0, status, "mutex_init");
aoqi@0	408	_cur_index = -1; // mark as unused
aoqi@0	409	}
aoqi@0	410	};
aoqi@0	411
aoqi@0	412	#endif // OS_LINUX_VM_OS_LINUX_HPP