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src/os/linux/vm/os_linux.hpp@c2ee42fa54cd (annotated)

src/os/linux/vm/os_linux.hpp

Thu, 22 Mar 2018 21:47:01 -0400

author

gromero

date

Thu, 22 Mar 2018 21:47:01 -0400

changeset 9303

c2ee42fa54cd

parent 9289

427b2fb1944f

child 9348

cb9634ab2906

permissions

-rw-r--r--

8198794: Hotspot crash on Cassandra 3.11.1 startup with libnuma 2.0.3
Reviewed-by: dholmes, phh

duke@435	1	/*
dbuck@9289	2	* Copyright (c) 1999, 2018, 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 OS_LINUX_VM_OS_LINUX_HPP
stefank@2314	26	#define OS_LINUX_VM_OS_LINUX_HPP
stefank@2314	27
duke@435	28	// Linux_OS defines the interface to Linux operating systems
duke@435	29
duke@435	30	/* pthread_getattr_np comes with LinuxThreads-0.9-7 on RedHat 7.1 */
duke@435	31	typedef int (*pthread_getattr_func_type) (pthread_t, pthread_attr_t *);
duke@435	32
goetz@6486	33	// Information about the protection of the page at address '0' on this os.
goetz@6486	34	static bool zero_page_read_protected() { return true; }
goetz@6486	35
duke@435	36	class Linux {
duke@435	37	friend class os;
stefank@5578	38	friend class TestReserveMemorySpecial;
duke@435	39
duke@435	40	// For signal-chaining
duke@435	41	#define MAXSIGNUM 32
duke@435	42	static struct sigaction sigact[MAXSIGNUM]; // saved preinstalled sigactions
duke@435	43	static unsigned int sigs; // mask of signals that have
duke@435	44	// preinstalled signal handlers
duke@435	45	static bool libjsig_is_loaded; // libjsig that interposes sigaction(),
duke@435	46	// __sigaction(), signal() is loaded
duke@435	47	static struct sigaction *(*get_signal_action)(int);
duke@435	48	static struct sigaction *get_preinstalled_handler(int);
duke@435	49	static void save_preinstalled_handler(int, struct sigaction&);
duke@435	50
duke@435	51	static void check_signal_handler(int sig);
duke@435	52
duke@435	53	// For signal flags diagnostics
duke@435	54	static int sigflags[MAXSIGNUM];
duke@435	55
duke@435	56	static int (*_clock_gettime)(clockid_t, struct timespec *);
duke@435	57	static int (*_pthread_getcpuclockid)(pthread_t, clockid_t *);
duke@435	58
duke@435	59	static address _initial_thread_stack_bottom;
duke@435	60	static uintptr_t _initial_thread_stack_size;
duke@435	61
xlu@634	62	static const char *_glibc_version;
xlu@634	63	static const char *_libpthread_version;
duke@435	64
duke@435	65	static bool _is_floating_stack;
duke@435	66	static bool _is_NPTL;
duke@435	67	static bool _supports_fast_thread_cpu_time;
duke@435	68
iveresov@576	69	static GrowableArray<int>* _cpu_to_node;
gromero@8776	70	static GrowableArray<int>* _nindex_to_node;
iveresov@576	71
duke@435	72	protected:
duke@435	73
duke@435	74	static julong _physical_memory;
duke@435	75	static pthread_t _main_thread;
duke@435	76	static Mutex* _createThread_lock;
duke@435	77	static int _page_size;
vladidan@4996	78	static const int _vm_default_page_size;
duke@435	79
duke@435	80	static julong available_memory();
duke@435	81	static julong physical_memory() { return _physical_memory; }
duke@435	82	static void initialize_system_info();
duke@435	83
dcubed@5255	84	static int commit_memory_impl(char* addr, size_t bytes, bool exec);
dcubed@5255	85	static int commit_memory_impl(char* addr, size_t bytes,
dcubed@5255	86	size_t alignment_hint, bool exec);
dcubed@5255	87
xlu@634	88	static void set_glibc_version(const char *s) { _glibc_version = s; }
xlu@634	89	static void set_libpthread_version(const char *s) { _libpthread_version = s; }
duke@435	90
duke@435	91	static bool supports_variable_stack_size();
duke@435	92
duke@435	93	static void set_is_NPTL() { _is_NPTL = true; }
duke@435	94	static void set_is_LinuxThreads() { _is_NPTL = false; }
duke@435	95	static void set_is_floating_stack() { _is_floating_stack = true; }
duke@435	96
iveresov@576	97	static void rebuild_cpu_to_node_map();
gromero@8776	98	static void rebuild_nindex_to_node_map();
iveresov@576	99	static GrowableArray<int>* cpu_to_node() { return _cpu_to_node; }
gromero@8776	100	static GrowableArray<int>* nindex_to_node() { return _nindex_to_node; }
iveresov@2818	101
stefank@5578	102	static size_t find_large_page_size();
stefank@5578	103	static size_t setup_large_page_size();
stefank@5578	104
stefank@5578	105	static bool setup_large_page_type(size_t page_size);
stefank@5578	106	static bool transparent_huge_pages_sanity_check(bool warn, size_t pages_size);
iveresov@2818	107	static bool hugetlbfs_sanity_check(bool warn, size_t page_size);
iveresov@2818	108
stefank@5578	109	static char* reserve_memory_special_shm(size_t bytes, size_t alignment, char* req_addr, bool exec);
stefank@5578	110	static char* reserve_memory_special_huge_tlbfs(size_t bytes, size_t alignment, char* req_addr, bool exec);
stefank@5578	111	static char* reserve_memory_special_huge_tlbfs_only(size_t bytes, char* req_addr, bool exec);
stefank@5578	112	static char* reserve_memory_special_huge_tlbfs_mixed(size_t bytes, size_t alignment, char* req_addr, bool exec);
stefank@5578	113
zgu@7074	114	static bool release_memory_special_impl(char* base, size_t bytes);
stefank@5578	115	static bool release_memory_special_shm(char* base, size_t bytes);
stefank@5578	116	static bool release_memory_special_huge_tlbfs(char* base, size_t bytes);
stefank@5578	117
nloodin@3783	118	static void print_full_memory_info(outputStream* st);
nloodin@3783	119	static void print_distro_info(outputStream* st);
nloodin@3783	120	static void print_libversion_info(outputStream* st);
nloodin@3783	121
duke@435	122	public:
iklam@4710	123	static bool _stack_is_executable;
iklam@4812	124	static void *dlopen_helper(const char *name, char *ebuf, int ebuflen);
iklam@4812	125	static void *dll_load_in_vmthread(const char *name, char *ebuf, int ebuflen);
iklam@4710	126
duke@435	127	static void init_thread_fpu_state();
duke@435	128	static int get_fpu_control_word();
duke@435	129	static void set_fpu_control_word(int fpu_control);
duke@435	130	static pthread_t main_thread(void) { return _main_thread; }
duke@435	131	// returns kernel thread id (similar to LWP id on Solaris), which can be
duke@435	132	// used to access /proc
duke@435	133	static pid_t gettid();
duke@435	134	static void set_createThread_lock(Mutex* lk) { _createThread_lock = lk; }
duke@435	135	static Mutex* createThread_lock(void) { return _createThread_lock; }
duke@435	136	static void hotspot_sigmask(Thread* thread);
duke@435	137
duke@435	138	static address initial_thread_stack_bottom(void) { return _initial_thread_stack_bottom; }
duke@435	139	static uintptr_t initial_thread_stack_size(void) { return _initial_thread_stack_size; }
duke@435	140
duke@435	141	static int page_size(void) { return _page_size; }
duke@435	142	static void set_page_size(int val) { _page_size = val; }
duke@435	143
vladidan@4996	144	static int vm_default_page_size(void) { return _vm_default_page_size; }
vladidan@4996	145
duke@435	146	static address ucontext_get_pc(ucontext_t* uc);
duke@435	147	static intptr_t* ucontext_get_sp(ucontext_t* uc);
duke@435	148	static intptr_t* ucontext_get_fp(ucontext_t* uc);
duke@435	149
duke@435	150	// For Analyzer Forte AsyncGetCallTrace profiling support:
duke@435	151	//
duke@435	152	// This interface should be declared in os_linux_i486.hpp, but
duke@435	153	// that file provides extensions to the os class and not the
duke@435	154	// Linux class.
duke@435	155	static ExtendedPC fetch_frame_from_ucontext(Thread* thread, ucontext_t* uc,
duke@435	156	intptr_t** ret_sp, intptr_t** ret_fp);
duke@435	157
duke@435	158	// This boolean allows users to forward their own non-matching signals
duke@435	159	// to JVM_handle_linux_signal, harmlessly.
duke@435	160	static bool signal_handlers_are_installed;
duke@435	161
duke@435	162	static int get_our_sigflags(int);
duke@435	163	static void set_our_sigflags(int, int);
duke@435	164	static void signal_sets_init();
duke@435	165	static void install_signal_handlers();
duke@435	166	static void set_signal_handler(int, bool);
duke@435	167	static bool is_sig_ignored(int sig);
duke@435	168
duke@435	169	static sigset_t* unblocked_signals();
duke@435	170	static sigset_t* vm_signals();
duke@435	171	static sigset_t* allowdebug_blocked_signals();
duke@435	172
duke@435	173	// For signal-chaining
duke@435	174	static struct sigaction *get_chained_signal_action(int sig);
duke@435	175	static bool chained_handler(int sig, siginfo_t* siginfo, void* context);
duke@435	176
duke@435	177	// GNU libc and libpthread version strings
xlu@634	178	static const char *glibc_version() { return _glibc_version; }
xlu@634	179	static const char *libpthread_version() { return _libpthread_version; }
duke@435	180
duke@435	181	// NPTL or LinuxThreads?
duke@435	182	static bool is_LinuxThreads() { return !_is_NPTL; }
duke@435	183	static bool is_NPTL() { return _is_NPTL; }
duke@435	184
duke@435	185	// NPTL is always floating stack. LinuxThreads could be using floating
duke@435	186	// stack or fixed stack.
duke@435	187	static bool is_floating_stack() { return _is_floating_stack; }
duke@435	188
duke@435	189	static void libpthread_init();
iveresov@897	190	static bool libnuma_init();
iveresov@1198	191	static void* libnuma_dlsym(void* handle, const char* name);
zgu@8878	192	// libnuma v2 (libnuma_1.2) symbols
zgu@8878	193	static void* libnuma_v2_dlsym(void* handle, const char* name);
duke@435	194	// Minimum stack size a thread can be created with (allowing
duke@435	195	// the VM to completely create the thread and enter user code)
duke@435	196	static size_t min_stack_allowed;
duke@435	197
duke@435	198	// Return default stack size or guard size for the specified thread type
duke@435	199	static size_t default_stack_size(os::ThreadType thr_type);
duke@435	200	static size_t default_guard_size(os::ThreadType thr_type);
duke@435	201
duke@435	202	static void capture_initial_stack(size_t max_size);
duke@435	203
duke@435	204	// Stack overflow handling
duke@435	205	static bool manually_expand_stack(JavaThread * t, address addr);
duke@435	206	static int max_register_window_saves_before_flushing();
duke@435	207
duke@435	208	// Real-time clock functions
duke@435	209	static void clock_init(void);
duke@435	210
duke@435	211	// fast POSIX clocks support
duke@435	212	static void fast_thread_clock_init(void);
duke@435	213
johnc@4017	214	static inline bool supports_monotonic_clock() {
duke@435	215	return _clock_gettime != NULL;
duke@435	216	}
duke@435	217
duke@435	218	static int clock_gettime(clockid_t clock_id, struct timespec *tp) {
duke@435	219	return _clock_gettime ? _clock_gettime(clock_id, tp) : -1;
duke@435	220	}
duke@435	221
duke@435	222	static int pthread_getcpuclockid(pthread_t tid, clockid_t *clock_id) {
duke@435	223	return _pthread_getcpuclockid ? _pthread_getcpuclockid(tid, clock_id) : -1;
duke@435	224	}
duke@435	225
duke@435	226	static bool supports_fast_thread_cpu_time() {
duke@435	227	return _supports_fast_thread_cpu_time;
duke@435	228	}
duke@435	229
duke@435	230	static jlong fast_thread_cpu_time(clockid_t clockid);
duke@435	231
dholmes@5679	232	// pthread_cond clock suppport
dholmes@5679	233	private:
dholmes@5679	234	static pthread_condattr_t _condattr[1];
dholmes@5679	235
dholmes@5679	236	public:
dholmes@5679	237	static pthread_condattr_t* condAttr() { return _condattr; }
dholmes@5679	238
duke@435	239	// Stack repair handling
duke@435	240
duke@435	241	// none present
duke@435	242
duke@435	243	// LinuxThreads work-around for 6292965
duke@435	244	static int safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime);
duke@435	245
iveresov@576	246	private:
iveresov@576	247	typedef int (*sched_getcpu_func_t)(void);
iveresov@576	248	typedef int (*numa_node_to_cpus_func_t)(int node, unsigned long *buffer, int bufferlen);
iveresov@576	249	typedef int (*numa_max_node_func_t)(void);
gromero@8776	250	typedef int (*numa_num_configured_nodes_func_t)(void);
iveresov@576	251	typedef int (*numa_available_func_t)(void);
iveresov@576	252	typedef int (*numa_tonode_memory_func_t)(void *start, size_t size, int node);
iveresov@897	253	typedef void (*numa_interleave_memory_func_t)(void *start, size_t size, unsigned long *nodemask);
zgu@8878	254	typedef void (*numa_interleave_memory_v2_func_t)(void *start, size_t size, struct bitmask* mask);
zgu@8878	255
mgerdin@5644	256	typedef void (*numa_set_bind_policy_func_t)(int policy);
gromero@8776	257	typedef int (*numa_bitmask_isbitset_func_t)(struct bitmask *bmp, unsigned int n);
gromero@8776	258	typedef int (*numa_distance_func_t)(int node1, int node2);
iveresov@576	259
iveresov@576	260	static sched_getcpu_func_t _sched_getcpu;
iveresov@576	261	static numa_node_to_cpus_func_t _numa_node_to_cpus;
iveresov@576	262	static numa_max_node_func_t _numa_max_node;
gromero@8776	263	static numa_num_configured_nodes_func_t _numa_num_configured_nodes;
iveresov@576	264	static numa_available_func_t _numa_available;
iveresov@576	265	static numa_tonode_memory_func_t _numa_tonode_memory;
iveresov@897	266	static numa_interleave_memory_func_t _numa_interleave_memory;
zgu@8878	267	static numa_interleave_memory_v2_func_t _numa_interleave_memory_v2;
mgerdin@5644	268	static numa_set_bind_policy_func_t _numa_set_bind_policy;
gromero@8776	269	static numa_bitmask_isbitset_func_t _numa_bitmask_isbitset;
gromero@8776	270	static numa_distance_func_t _numa_distance;
iveresov@897	271	static unsigned long* _numa_all_nodes;
gromero@8776	272	static struct bitmask* _numa_all_nodes_ptr;
gromero@8776	273	static struct bitmask* _numa_nodes_ptr;
iveresov@576	274
iveresov@576	275	static void set_sched_getcpu(sched_getcpu_func_t func) { _sched_getcpu = func; }
iveresov@576	276	static void set_numa_node_to_cpus(numa_node_to_cpus_func_t func) { _numa_node_to_cpus = func; }
iveresov@576	277	static void set_numa_max_node(numa_max_node_func_t func) { _numa_max_node = func; }
gromero@8776	278	static void set_numa_num_configured_nodes(numa_num_configured_nodes_func_t func) { _numa_num_configured_nodes = func; }
iveresov@576	279	static void set_numa_available(numa_available_func_t func) { _numa_available = func; }
iveresov@576	280	static void set_numa_tonode_memory(numa_tonode_memory_func_t func) { _numa_tonode_memory = func; }
iveresov@897	281	static void set_numa_interleave_memory(numa_interleave_memory_func_t func) { _numa_interleave_memory = func; }
zgu@8878	282	static void set_numa_interleave_memory_v2(numa_interleave_memory_v2_func_t func) { _numa_interleave_memory_v2 = func; }
mgerdin@5644	283	static void set_numa_set_bind_policy(numa_set_bind_policy_func_t func) { _numa_set_bind_policy = func; }
gromero@8776	284	static void set_numa_bitmask_isbitset(numa_bitmask_isbitset_func_t func) { _numa_bitmask_isbitset = func; }
gromero@8776	285	static void set_numa_distance(numa_distance_func_t func) { _numa_distance = func; }
iveresov@897	286	static void set_numa_all_nodes(unsigned long* ptr) { _numa_all_nodes = ptr; }
gromero@9303	287	static void set_numa_all_nodes_ptr(struct bitmask **ptr) { _numa_all_nodes_ptr = (ptr == NULL ? NULL : *ptr); }
gromero@9303	288	static void set_numa_nodes_ptr(struct bitmask **ptr) { _numa_nodes_ptr = (ptr == NULL ? NULL : *ptr); }
iveresov@3024	289	static int sched_getcpu_syscall(void);
iveresov@576	290	public:
iveresov@576	291	static int sched_getcpu() { return _sched_getcpu != NULL ? _sched_getcpu() : -1; }
iveresov@576	292	static int numa_node_to_cpus(int node, unsigned long *buffer, int bufferlen) {
iveresov@576	293	return _numa_node_to_cpus != NULL ? _numa_node_to_cpus(node, buffer, bufferlen) : -1;
iveresov@576	294	}
iveresov@576	295	static int numa_max_node() { return _numa_max_node != NULL ? _numa_max_node() : -1; }
gromero@8776	296	static int numa_num_configured_nodes() {
gromero@8776	297	return _numa_num_configured_nodes != NULL ? _numa_num_configured_nodes() : -1;
gromero@8776	298	}
iveresov@576	299	static int numa_available() { return _numa_available != NULL ? _numa_available() : -1; }
iveresov@576	300	static int numa_tonode_memory(void *start, size_t size, int node) {
iveresov@576	301	return _numa_tonode_memory != NULL ? _numa_tonode_memory(start, size, node) : -1;
iveresov@576	302	}
iveresov@897	303	static void numa_interleave_memory(void *start, size_t size) {
zgu@8878	304	// Use v2 api if available
zgu@8878	305	if (_numa_interleave_memory_v2 != NULL && _numa_all_nodes_ptr != NULL) {
zgu@8878	306	_numa_interleave_memory_v2(start, size, _numa_all_nodes_ptr);
zgu@8878	307	} else if (_numa_interleave_memory != NULL && _numa_all_nodes != NULL) {
iveresov@897	308	_numa_interleave_memory(start, size, _numa_all_nodes);
iveresov@897	309	}
iveresov@897	310	}
mgerdin@5644	311	static void numa_set_bind_policy(int policy) {
mgerdin@5644	312	if (_numa_set_bind_policy != NULL) {
mgerdin@5644	313	_numa_set_bind_policy(policy);
mgerdin@5644	314	}
mgerdin@5644	315	}
gromero@8776	316	static int numa_distance(int node1, int node2) {
gromero@8776	317	return _numa_distance != NULL ? _numa_distance(node1, node2) : -1;
gromero@8776	318	}
iveresov@576	319	static int get_node_by_cpu(int cpu_id);
gromero@8776	320	static int get_existing_num_nodes();
gromero@8776	321	// Check if numa node is configured (non-zero memory node).
gromero@8776	322	static bool isnode_in_configured_nodes(unsigned int n) {
gromero@8776	323	if (_numa_bitmask_isbitset != NULL && _numa_all_nodes_ptr != NULL) {
gromero@8776	324	return _numa_bitmask_isbitset(_numa_all_nodes_ptr, n);
gromero@8776	325	} else
gromero@8776	326	return 0;
gromero@8776	327	}
gromero@8776	328	// Check if numa node exists in the system (including zero memory nodes).
gromero@8776	329	static bool isnode_in_existing_nodes(unsigned int n) {
gromero@8776	330	if (_numa_bitmask_isbitset != NULL && _numa_nodes_ptr != NULL) {
gromero@8776	331	return _numa_bitmask_isbitset(_numa_nodes_ptr, n);
gromero@9303	332	} else if (_numa_bitmask_isbitset != NULL && _numa_all_nodes_ptr != NULL) {
gromero@9303	333	// Not all libnuma API v2 implement numa_nodes_ptr, so it's not possible
gromero@9303	334	// to trust the API version for checking its absence. On the other hand,
gromero@9303	335	// numa_nodes_ptr found in libnuma 2.0.9 and above is the only way to get
gromero@9303	336	// a complete view of all numa nodes in the system, hence numa_nodes_ptr
gromero@9303	337	// is used to handle CPU and nodes on architectures (like PowerPC) where
gromero@9303	338	// there can exist nodes with CPUs but no memory or vice-versa and the
gromero@9303	339	// nodes may be non-contiguous. For most of the architectures, like
gromero@9303	340	// x86_64, numa_node_ptr presents the same node set as found in
gromero@9303	341	// numa_all_nodes_ptr so it's possible to use numa_all_nodes_ptr as a
gromero@9303	342	// substitute.
gromero@9303	343	return _numa_bitmask_isbitset(_numa_all_nodes_ptr, n);
gromero@8776	344	} else
gromero@8776	345	return 0;
gromero@8776	346	}
duke@435	347	};
duke@435	348
duke@435	349
zgu@3900	350	class PlatformEvent : public CHeapObj<mtInternal> {
duke@435	351	private:
duke@435	352	double CachePad [4] ; // increase odds that _mutex is sole occupant of cache line
duke@435	353	volatile int _Event ;
duke@435	354	volatile int _nParked ;
duke@435	355	pthread_mutex_t _mutex [1] ;
duke@435	356	pthread_cond_t _cond [1] ;
duke@435	357	double PostPad [2] ;
duke@435	358	Thread * _Assoc ;
duke@435	359
duke@435	360	public: // TODO-FIXME: make dtor private
duke@435	361	~PlatformEvent() { guarantee (0, "invariant") ; }
duke@435	362
duke@435	363	public:
duke@435	364	PlatformEvent() {
duke@435	365	int status;
dholmes@5679	366	status = pthread_cond_init (_cond, os::Linux::condAttr());
duke@435	367	assert_status(status == 0, status, "cond_init");
duke@435	368	status = pthread_mutex_init (_mutex, NULL);
duke@435	369	assert_status(status == 0, status, "mutex_init");
duke@435	370	_Event = 0 ;
duke@435	371	_nParked = 0 ;
duke@435	372	_Assoc = NULL ;
duke@435	373	}
duke@435	374
duke@435	375	// Use caution with reset() and fired() -- they may require MEMBARs
duke@435	376	void reset() { _Event = 0 ; }
duke@435	377	int fired() { return _Event; }
duke@435	378	void park () ;
duke@435	379	void unpark () ;
duke@435	380	int TryPark () ;
dholmes@5679	381	int park (jlong millis) ; // relative timed-wait only
duke@435	382	void SetAssociation (Thread * a) { _Assoc = a ; }
duke@435	383	} ;
duke@435	384
zgu@3900	385	class PlatformParker : public CHeapObj<mtInternal> {
duke@435	386	protected:
dholmes@5679	387	enum {
dholmes@5679	388	REL_INDEX = 0,
dholmes@5679	389	ABS_INDEX = 1
dholmes@5679	390	};
dholmes@5679	391	int _cur_index; // which cond is in use: -1, 0, 1
duke@435	392	pthread_mutex_t _mutex [1] ;
dholmes@5679	393	pthread_cond_t _cond [2] ; // one for relative times and one for abs.
duke@435	394
duke@435	395	public: // TODO-FIXME: make dtor private
duke@435	396	~PlatformParker() { guarantee (0, "invariant") ; }
duke@435	397
duke@435	398	public:
duke@435	399	PlatformParker() {
duke@435	400	int status;
dholmes@5679	401	status = pthread_cond_init (&_cond[REL_INDEX], os::Linux::condAttr());
dholmes@5679	402	assert_status(status == 0, status, "cond_init rel");
dholmes@5679	403	status = pthread_cond_init (&_cond[ABS_INDEX], NULL);
dholmes@5679	404	assert_status(status == 0, status, "cond_init abs");
duke@435	405	status = pthread_mutex_init (_mutex, NULL);
duke@435	406	assert_status(status == 0, status, "mutex_init");
dholmes@5679	407	_cur_index = -1; // mark as unused
duke@435	408	}
sla@5237	409	};
stefank@2314	410
stefank@2314	411	#endif // OS_LINUX_VM_OS_LINUX_HPP