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src/os/linux/vm/os_linux.hpp@5aa3d728164a (annotated)

src/os/linux/vm/os_linux.hpp

Fri, 06 Jul 2018 18:50:13 +0000

author

poonam

date

Fri, 06 Jul 2018 18:50:13 +0000

changeset 9413

5aa3d728164a

parent 9182

0f31f18d2241

child 9417

65409bcab2ad

permissions

-rw-r--r--

8146115: Improve docker container detection and resource configuration usage
Reviewed-by: bobv, dbuck

duke@435	1	/*
simonis@4675	2	* Copyright (c) 1999, 2013, 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;
poonam@9413	38	friend class OSContainer;
stefank@5578	39	friend class TestReserveMemorySpecial;
duke@435	40
duke@435	41	// For signal-chaining
duke@435	42	#define MAXSIGNUM 32
duke@435	43	static struct sigaction sigact[MAXSIGNUM]; // saved preinstalled sigactions
duke@435	44	static unsigned int sigs; // mask of signals that have
duke@435	45	// preinstalled signal handlers
duke@435	46	static bool libjsig_is_loaded; // libjsig that interposes sigaction(),
duke@435	47	// __sigaction(), signal() is loaded
duke@435	48	static struct sigaction *(*get_signal_action)(int);
duke@435	49	static struct sigaction *get_preinstalled_handler(int);
duke@435	50	static void save_preinstalled_handler(int, struct sigaction&);
duke@435	51
duke@435	52	static void check_signal_handler(int sig);
duke@435	53
duke@435	54	// For signal flags diagnostics
duke@435	55	static int sigflags[MAXSIGNUM];
duke@435	56
duke@435	57	static int (*_clock_gettime)(clockid_t, struct timespec *);
duke@435	58	static int (*_pthread_getcpuclockid)(pthread_t, clockid_t *);
duke@435	59
duke@435	60	static address _initial_thread_stack_bottom;
duke@435	61	static uintptr_t _initial_thread_stack_size;
duke@435	62
xlu@634	63	static const char *_glibc_version;
xlu@634	64	static const char *_libpthread_version;
duke@435	65
duke@435	66	static bool _is_floating_stack;
duke@435	67	static bool _is_NPTL;
duke@435	68	static bool _supports_fast_thread_cpu_time;
duke@435	69
iveresov@576	70	static GrowableArray<int>* _cpu_to_node;
gromero@8776	71	static GrowableArray<int>* _nindex_to_node;
iveresov@576	72
duke@435	73	protected:
duke@435	74
duke@435	75	static julong _physical_memory;
duke@435	76	static pthread_t _main_thread;
duke@435	77	static Mutex* _createThread_lock;
duke@435	78	static int _page_size;
vladidan@4996	79	static const int _vm_default_page_size;
duke@435	80
duke@435	81	static julong available_memory();
duke@435	82	static julong physical_memory() { return _physical_memory; }
poonam@9413	83	static void set_physical_memory(julong phys_mem) { _physical_memory = phys_mem; }
poonam@9413	84	static int active_processor_count();
poonam@9413	85
duke@435	86	static void initialize_system_info();
duke@435	87
dcubed@5255	88	static int commit_memory_impl(char* addr, size_t bytes, bool exec);
dcubed@5255	89	static int commit_memory_impl(char* addr, size_t bytes,
dcubed@5255	90	size_t alignment_hint, bool exec);
dcubed@5255	91
xlu@634	92	static void set_glibc_version(const char *s) { _glibc_version = s; }
xlu@634	93	static void set_libpthread_version(const char *s) { _libpthread_version = s; }
duke@435	94
duke@435	95	static bool supports_variable_stack_size();
duke@435	96
duke@435	97	static void set_is_NPTL() { _is_NPTL = true; }
duke@435	98	static void set_is_LinuxThreads() { _is_NPTL = false; }
duke@435	99	static void set_is_floating_stack() { _is_floating_stack = true; }
duke@435	100
iveresov@576	101	static void rebuild_cpu_to_node_map();
gromero@8776	102	static void rebuild_nindex_to_node_map();
iveresov@576	103	static GrowableArray<int>* cpu_to_node() { return _cpu_to_node; }
gromero@8776	104	static GrowableArray<int>* nindex_to_node() { return _nindex_to_node; }
iveresov@2818	105
stefank@5578	106	static size_t find_large_page_size();
stefank@5578	107	static size_t setup_large_page_size();
stefank@5578	108
stefank@5578	109	static bool setup_large_page_type(size_t page_size);
stefank@5578	110	static bool transparent_huge_pages_sanity_check(bool warn, size_t pages_size);
iveresov@2818	111	static bool hugetlbfs_sanity_check(bool warn, size_t page_size);
iveresov@2818	112
stefank@5578	113	static char* reserve_memory_special_shm(size_t bytes, size_t alignment, char* req_addr, bool exec);
stefank@5578	114	static char* reserve_memory_special_huge_tlbfs(size_t bytes, size_t alignment, char* req_addr, bool exec);
stefank@5578	115	static char* reserve_memory_special_huge_tlbfs_only(size_t bytes, char* req_addr, bool exec);
stefank@5578	116	static char* reserve_memory_special_huge_tlbfs_mixed(size_t bytes, size_t alignment, char* req_addr, bool exec);
stefank@5578	117
zgu@7074	118	static bool release_memory_special_impl(char* base, size_t bytes);
stefank@5578	119	static bool release_memory_special_shm(char* base, size_t bytes);
stefank@5578	120	static bool release_memory_special_huge_tlbfs(char* base, size_t bytes);
stefank@5578	121
nloodin@3783	122	static void print_full_memory_info(outputStream* st);
poonam@9413	123	static void print_container_info(outputStream* st);
nloodin@3783	124	static void print_distro_info(outputStream* st);
nloodin@3783	125	static void print_libversion_info(outputStream* st);
nloodin@3783	126
duke@435	127	public:
iklam@4710	128	static bool _stack_is_executable;
iklam@4812	129	static void *dlopen_helper(const char *name, char *ebuf, int ebuflen);
iklam@4812	130	static void *dll_load_in_vmthread(const char *name, char *ebuf, int ebuflen);
iklam@4710	131
duke@435	132	static void init_thread_fpu_state();
duke@435	133	static int get_fpu_control_word();
duke@435	134	static void set_fpu_control_word(int fpu_control);
duke@435	135	static pthread_t main_thread(void) { return _main_thread; }
duke@435	136	// returns kernel thread id (similar to LWP id on Solaris), which can be
duke@435	137	// used to access /proc
duke@435	138	static pid_t gettid();
duke@435	139	static void set_createThread_lock(Mutex* lk) { _createThread_lock = lk; }
duke@435	140	static Mutex* createThread_lock(void) { return _createThread_lock; }
duke@435	141	static void hotspot_sigmask(Thread* thread);
duke@435	142
duke@435	143	static address initial_thread_stack_bottom(void) { return _initial_thread_stack_bottom; }
duke@435	144	static uintptr_t initial_thread_stack_size(void) { return _initial_thread_stack_size; }
duke@435	145	static bool is_initial_thread(void);
duke@435	146
duke@435	147	static int page_size(void) { return _page_size; }
duke@435	148	static void set_page_size(int val) { _page_size = val; }
duke@435	149
vladidan@4996	150	static int vm_default_page_size(void) { return _vm_default_page_size; }
vladidan@4996	151
duke@435	152	static address ucontext_get_pc(ucontext_t* uc);
duke@435	153	static intptr_t* ucontext_get_sp(ucontext_t* uc);
duke@435	154	static intptr_t* ucontext_get_fp(ucontext_t* uc);
duke@435	155
duke@435	156	// For Analyzer Forte AsyncGetCallTrace profiling support:
duke@435	157	//
duke@435	158	// This interface should be declared in os_linux_i486.hpp, but
duke@435	159	// that file provides extensions to the os class and not the
duke@435	160	// Linux class.
duke@435	161	static ExtendedPC fetch_frame_from_ucontext(Thread* thread, ucontext_t* uc,
duke@435	162	intptr_t** ret_sp, intptr_t** ret_fp);
duke@435	163
duke@435	164	// This boolean allows users to forward their own non-matching signals
duke@435	165	// to JVM_handle_linux_signal, harmlessly.
duke@435	166	static bool signal_handlers_are_installed;
duke@435	167
duke@435	168	static int get_our_sigflags(int);
duke@435	169	static void set_our_sigflags(int, int);
duke@435	170	static void signal_sets_init();
duke@435	171	static void install_signal_handlers();
duke@435	172	static void set_signal_handler(int, bool);
duke@435	173	static bool is_sig_ignored(int sig);
duke@435	174
duke@435	175	static sigset_t* unblocked_signals();
duke@435	176	static sigset_t* vm_signals();
duke@435	177	static sigset_t* allowdebug_blocked_signals();
duke@435	178
duke@435	179	// For signal-chaining
duke@435	180	static struct sigaction *get_chained_signal_action(int sig);
duke@435	181	static bool chained_handler(int sig, siginfo_t* siginfo, void* context);
duke@435	182
duke@435	183	// GNU libc and libpthread version strings
xlu@634	184	static const char *glibc_version() { return _glibc_version; }
xlu@634	185	static const char *libpthread_version() { return _libpthread_version; }
duke@435	186
duke@435	187	// NPTL or LinuxThreads?
duke@435	188	static bool is_LinuxThreads() { return !_is_NPTL; }
duke@435	189	static bool is_NPTL() { return _is_NPTL; }
duke@435	190
duke@435	191	// NPTL is always floating stack. LinuxThreads could be using floating
duke@435	192	// stack or fixed stack.
duke@435	193	static bool is_floating_stack() { return _is_floating_stack; }
duke@435	194
duke@435	195	static void libpthread_init();
iveresov@897	196	static bool libnuma_init();
iveresov@1198	197	static void* libnuma_dlsym(void* handle, const char* name);
zgu@8878	198	// libnuma v2 (libnuma_1.2) symbols
zgu@8878	199	static void* libnuma_v2_dlsym(void* handle, const char* name);
duke@435	200	// Minimum stack size a thread can be created with (allowing
duke@435	201	// the VM to completely create the thread and enter user code)
duke@435	202	static size_t min_stack_allowed;
duke@435	203
duke@435	204	// Return default stack size or guard size for the specified thread type
duke@435	205	static size_t default_stack_size(os::ThreadType thr_type);
duke@435	206	static size_t default_guard_size(os::ThreadType thr_type);
duke@435	207
duke@435	208	static void capture_initial_stack(size_t max_size);
duke@435	209
duke@435	210	// Stack overflow handling
duke@435	211	static bool manually_expand_stack(JavaThread * t, address addr);
duke@435	212	static int max_register_window_saves_before_flushing();
duke@435	213
duke@435	214	// Real-time clock functions
duke@435	215	static void clock_init(void);
duke@435	216
duke@435	217	// fast POSIX clocks support
duke@435	218	static void fast_thread_clock_init(void);
duke@435	219
johnc@4017	220	static inline bool supports_monotonic_clock() {
duke@435	221	return _clock_gettime != NULL;
duke@435	222	}
duke@435	223
duke@435	224	static int clock_gettime(clockid_t clock_id, struct timespec *tp) {
duke@435	225	return _clock_gettime ? _clock_gettime(clock_id, tp) : -1;
duke@435	226	}
duke@435	227
duke@435	228	static int pthread_getcpuclockid(pthread_t tid, clockid_t *clock_id) {
duke@435	229	return _pthread_getcpuclockid ? _pthread_getcpuclockid(tid, clock_id) : -1;
duke@435	230	}
duke@435	231
duke@435	232	static bool supports_fast_thread_cpu_time() {
duke@435	233	return _supports_fast_thread_cpu_time;
duke@435	234	}
duke@435	235
duke@435	236	static jlong fast_thread_cpu_time(clockid_t clockid);
duke@435	237
dholmes@5679	238	// pthread_cond clock suppport
dholmes@5679	239	private:
dholmes@5679	240	static pthread_condattr_t _condattr[1];
dholmes@5679	241
dholmes@5679	242	public:
dholmes@5679	243	static pthread_condattr_t* condAttr() { return _condattr; }
dholmes@5679	244
duke@435	245	// Stack repair handling
duke@435	246
duke@435	247	// none present
duke@435	248
duke@435	249	// LinuxThreads work-around for 6292965
duke@435	250	static int safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime);
duke@435	251
iveresov@576	252	private:
iveresov@576	253	typedef int (*sched_getcpu_func_t)(void);
iveresov@576	254	typedef int (*numa_node_to_cpus_func_t)(int node, unsigned long *buffer, int bufferlen);
iveresov@576	255	typedef int (*numa_max_node_func_t)(void);
gromero@8776	256	typedef int (*numa_num_configured_nodes_func_t)(void);
iveresov@576	257	typedef int (*numa_available_func_t)(void);
iveresov@576	258	typedef int (*numa_tonode_memory_func_t)(void *start, size_t size, int node);
iveresov@897	259	typedef void (*numa_interleave_memory_func_t)(void *start, size_t size, unsigned long *nodemask);
zgu@8878	260	typedef void (*numa_interleave_memory_v2_func_t)(void *start, size_t size, struct bitmask* mask);
zgu@8878	261
mgerdin@5644	262	typedef void (*numa_set_bind_policy_func_t)(int policy);
gromero@8776	263	typedef int (*numa_bitmask_isbitset_func_t)(struct bitmask *bmp, unsigned int n);
gromero@8776	264	typedef int (*numa_distance_func_t)(int node1, int node2);
iveresov@576	265
iveresov@576	266	static sched_getcpu_func_t _sched_getcpu;
iveresov@576	267	static numa_node_to_cpus_func_t _numa_node_to_cpus;
iveresov@576	268	static numa_max_node_func_t _numa_max_node;
gromero@8776	269	static numa_num_configured_nodes_func_t _numa_num_configured_nodes;
iveresov@576	270	static numa_available_func_t _numa_available;
iveresov@576	271	static numa_tonode_memory_func_t _numa_tonode_memory;
iveresov@897	272	static numa_interleave_memory_func_t _numa_interleave_memory;
zgu@8878	273	static numa_interleave_memory_v2_func_t _numa_interleave_memory_v2;
mgerdin@5644	274	static numa_set_bind_policy_func_t _numa_set_bind_policy;
gromero@8776	275	static numa_bitmask_isbitset_func_t _numa_bitmask_isbitset;
gromero@8776	276	static numa_distance_func_t _numa_distance;
iveresov@897	277	static unsigned long* _numa_all_nodes;
gromero@8776	278	static struct bitmask* _numa_all_nodes_ptr;
gromero@8776	279	static struct bitmask* _numa_nodes_ptr;
iveresov@576	280
iveresov@576	281	static void set_sched_getcpu(sched_getcpu_func_t func) { _sched_getcpu = func; }
iveresov@576	282	static void set_numa_node_to_cpus(numa_node_to_cpus_func_t func) { _numa_node_to_cpus = func; }
iveresov@576	283	static void set_numa_max_node(numa_max_node_func_t func) { _numa_max_node = func; }
gromero@8776	284	static void set_numa_num_configured_nodes(numa_num_configured_nodes_func_t func) { _numa_num_configured_nodes = func; }
iveresov@576	285	static void set_numa_available(numa_available_func_t func) { _numa_available = func; }
iveresov@576	286	static void set_numa_tonode_memory(numa_tonode_memory_func_t func) { _numa_tonode_memory = func; }
iveresov@897	287	static void set_numa_interleave_memory(numa_interleave_memory_func_t func) { _numa_interleave_memory = func; }
zgu@8878	288	static void set_numa_interleave_memory_v2(numa_interleave_memory_v2_func_t func) { _numa_interleave_memory_v2 = func; }
mgerdin@5644	289	static void set_numa_set_bind_policy(numa_set_bind_policy_func_t func) { _numa_set_bind_policy = func; }
gromero@8776	290	static void set_numa_bitmask_isbitset(numa_bitmask_isbitset_func_t func) { _numa_bitmask_isbitset = func; }
gromero@8776	291	static void set_numa_distance(numa_distance_func_t func) { _numa_distance = func; }
iveresov@897	292	static void set_numa_all_nodes(unsigned long* ptr) { _numa_all_nodes = ptr; }
gromero@9182	293	static void set_numa_all_nodes_ptr(struct bitmask **ptr) { _numa_all_nodes_ptr = (ptr == NULL ? NULL : *ptr); }
gromero@9182	294	static void set_numa_nodes_ptr(struct bitmask **ptr) { _numa_nodes_ptr = (ptr == NULL ? NULL : *ptr); }
iveresov@3024	295	static int sched_getcpu_syscall(void);
iveresov@576	296	public:
iveresov@576	297	static int sched_getcpu() { return _sched_getcpu != NULL ? _sched_getcpu() : -1; }
iveresov@576	298	static int numa_node_to_cpus(int node, unsigned long *buffer, int bufferlen) {
iveresov@576	299	return _numa_node_to_cpus != NULL ? _numa_node_to_cpus(node, buffer, bufferlen) : -1;
iveresov@576	300	}
iveresov@576	301	static int numa_max_node() { return _numa_max_node != NULL ? _numa_max_node() : -1; }
gromero@8776	302	static int numa_num_configured_nodes() {
gromero@8776	303	return _numa_num_configured_nodes != NULL ? _numa_num_configured_nodes() : -1;
gromero@8776	304	}
iveresov@576	305	static int numa_available() { return _numa_available != NULL ? _numa_available() : -1; }
iveresov@576	306	static int numa_tonode_memory(void *start, size_t size, int node) {
iveresov@576	307	return _numa_tonode_memory != NULL ? _numa_tonode_memory(start, size, node) : -1;
iveresov@576	308	}
iveresov@897	309	static void numa_interleave_memory(void *start, size_t size) {
zgu@8878	310	// Use v2 api if available
zgu@8878	311	if (_numa_interleave_memory_v2 != NULL && _numa_all_nodes_ptr != NULL) {
zgu@8878	312	_numa_interleave_memory_v2(start, size, _numa_all_nodes_ptr);
zgu@8878	313	} else if (_numa_interleave_memory != NULL && _numa_all_nodes != NULL) {
iveresov@897	314	_numa_interleave_memory(start, size, _numa_all_nodes);
iveresov@897	315	}
iveresov@897	316	}
mgerdin@5644	317	static void numa_set_bind_policy(int policy) {
mgerdin@5644	318	if (_numa_set_bind_policy != NULL) {
mgerdin@5644	319	_numa_set_bind_policy(policy);
mgerdin@5644	320	}
mgerdin@5644	321	}
gromero@8776	322	static int numa_distance(int node1, int node2) {
gromero@8776	323	return _numa_distance != NULL ? _numa_distance(node1, node2) : -1;
gromero@8776	324	}
iveresov@576	325	static int get_node_by_cpu(int cpu_id);
gromero@8776	326	static int get_existing_num_nodes();
gromero@8776	327	// Check if numa node is configured (non-zero memory node).
gromero@8776	328	static bool isnode_in_configured_nodes(unsigned int n) {
gromero@8776	329	if (_numa_bitmask_isbitset != NULL && _numa_all_nodes_ptr != NULL) {
gromero@8776	330	return _numa_bitmask_isbitset(_numa_all_nodes_ptr, n);
gromero@8776	331	} else
gromero@8776	332	return 0;
gromero@8776	333	}
gromero@8776	334	// Check if numa node exists in the system (including zero memory nodes).
gromero@8776	335	static bool isnode_in_existing_nodes(unsigned int n) {
gromero@8776	336	if (_numa_bitmask_isbitset != NULL && _numa_nodes_ptr != NULL) {
gromero@8776	337	return _numa_bitmask_isbitset(_numa_nodes_ptr, n);
gromero@9182	338	} else if (_numa_bitmask_isbitset != NULL && _numa_all_nodes_ptr != NULL) {
gromero@9182	339	// Not all libnuma API v2 implement numa_nodes_ptr, so it's not possible
gromero@9182	340	// to trust the API version for checking its absence. On the other hand,
gromero@9182	341	// numa_nodes_ptr found in libnuma 2.0.9 and above is the only way to get
gromero@9182	342	// a complete view of all numa nodes in the system, hence numa_nodes_ptr
gromero@9182	343	// is used to handle CPU and nodes on architectures (like PowerPC) where
gromero@9182	344	// there can exist nodes with CPUs but no memory or vice-versa and the
gromero@9182	345	// nodes may be non-contiguous. For most of the architectures, like
gromero@9182	346	// x86_64, numa_node_ptr presents the same node set as found in
gromero@9182	347	// numa_all_nodes_ptr so it's possible to use numa_all_nodes_ptr as a
gromero@9182	348	// substitute.
gromero@9182	349	return _numa_bitmask_isbitset(_numa_all_nodes_ptr, n);
gromero@8776	350	} else
gromero@8776	351	return 0;
gromero@8776	352	}
duke@435	353	};
duke@435	354
duke@435	355
zgu@3900	356	class PlatformEvent : public CHeapObj<mtInternal> {
duke@435	357	private:
duke@435	358	double CachePad [4] ; // increase odds that _mutex is sole occupant of cache line
duke@435	359	volatile int _Event ;
duke@435	360	volatile int _nParked ;
duke@435	361	pthread_mutex_t _mutex [1] ;
duke@435	362	pthread_cond_t _cond [1] ;
duke@435	363	double PostPad [2] ;
duke@435	364	Thread * _Assoc ;
duke@435	365
duke@435	366	public: // TODO-FIXME: make dtor private
duke@435	367	~PlatformEvent() { guarantee (0, "invariant") ; }
duke@435	368
duke@435	369	public:
duke@435	370	PlatformEvent() {
duke@435	371	int status;
dholmes@5679	372	status = pthread_cond_init (_cond, os::Linux::condAttr());
duke@435	373	assert_status(status == 0, status, "cond_init");
duke@435	374	status = pthread_mutex_init (_mutex, NULL);
duke@435	375	assert_status(status == 0, status, "mutex_init");
duke@435	376	_Event = 0 ;
duke@435	377	_nParked = 0 ;
duke@435	378	_Assoc = NULL ;
duke@435	379	}
duke@435	380
duke@435	381	// Use caution with reset() and fired() -- they may require MEMBARs
duke@435	382	void reset() { _Event = 0 ; }
duke@435	383	int fired() { return _Event; }
duke@435	384	void park () ;
duke@435	385	void unpark () ;
duke@435	386	int TryPark () ;
dholmes@5679	387	int park (jlong millis) ; // relative timed-wait only
duke@435	388	void SetAssociation (Thread * a) { _Assoc = a ; }
duke@435	389	} ;
duke@435	390
zgu@3900	391	class PlatformParker : public CHeapObj<mtInternal> {
duke@435	392	protected:
dholmes@5679	393	enum {
dholmes@5679	394	REL_INDEX = 0,
dholmes@5679	395	ABS_INDEX = 1
dholmes@5679	396	};
dholmes@5679	397	int _cur_index; // which cond is in use: -1, 0, 1
duke@435	398	pthread_mutex_t _mutex [1] ;
dholmes@5679	399	pthread_cond_t _cond [2] ; // one for relative times and one for abs.
duke@435	400
duke@435	401	public: // TODO-FIXME: make dtor private
duke@435	402	~PlatformParker() { guarantee (0, "invariant") ; }
duke@435	403
duke@435	404	public:
duke@435	405	PlatformParker() {
duke@435	406	int status;
dholmes@5679	407	status = pthread_cond_init (&_cond[REL_INDEX], os::Linux::condAttr());
dholmes@5679	408	assert_status(status == 0, status, "cond_init rel");
dholmes@5679	409	status = pthread_cond_init (&_cond[ABS_INDEX], NULL);
dholmes@5679	410	assert_status(status == 0, status, "cond_init abs");
duke@435	411	status = pthread_mutex_init (_mutex, NULL);
duke@435	412	assert_status(status == 0, status, "mutex_init");
dholmes@5679	413	_cur_index = -1; // mark as unused
duke@435	414	}
sla@5237	415	};
stefank@2314	416
stefank@2314	417	#endif // OS_LINUX_VM_OS_LINUX_HPP