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src/os/bsd/vm/os_bsd.hpp@6cb0d32b828b (annotated)

src/os/bsd/vm/os_bsd.hpp

Wed, 07 Nov 2012 17:53:02 -0500

author

bpittore

date

Wed, 07 Nov 2012 17:53:02 -0500

changeset 4261

6cb0d32b828b

parent 4229

0af5da0c9d9d

child 4675

63e54c37ac64

permissions

-rw-r--r--

8001185: parsing of sun.boot.library.path in os::dll_build_name somewhat broken
Summary: dll_dir can contain multiple paths, need to parse them correctly when loading agents
Reviewed-by: dholmes, dlong
Contributed-by: bill.pittore@oracle.com

never@3156	1	/*
johnc@4017	2	* Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved.
never@3156	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
never@3156	4	*
never@3156	5	* This code is free software; you can redistribute it and/or modify it
never@3156	6	* under the terms of the GNU General Public License version 2 only, as
never@3156	7	* published by the Free Software Foundation.
never@3156	8	*
never@3156	9	* This code is distributed in the hope that it will be useful, but WITHOUT
never@3156	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
never@3156	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
never@3156	12	* version 2 for more details (a copy is included in the LICENSE file that
never@3156	13	* accompanied this code).
never@3156	14	*
never@3156	15	* You should have received a copy of the GNU General Public License version
never@3156	16	* 2 along with this work; if not, write to the Free Software Foundation,
never@3156	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
never@3156	18	*
never@3156	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
never@3156	20	* or visit www.oracle.com if you need additional information or have any
never@3156	21	* questions.
never@3156	22	*
never@3156	23	*/
never@3156	24
never@3156	25	#ifndef OS_BSD_VM_OS_BSD_HPP
never@3156	26	#define OS_BSD_VM_OS_BSD_HPP
never@3156	27
never@3156	28	// Bsd_OS defines the interface to Bsd operating systems
never@3156	29
never@3156	30	/* pthread_getattr_np comes with BsdThreads-0.9-7 on RedHat 7.1 */
never@3156	31	typedef int (*pthread_getattr_func_type) (pthread_t, pthread_attr_t *);
never@3156	32
never@3156	33	#ifdef __APPLE__
never@3156	34	// Mac OS X doesn't support clock_gettime. Stub out the type, it is
never@3156	35	// unused
never@3156	36	typedef int clockid_t;
never@3156	37	#endif
never@3156	38
never@3156	39	class Bsd {
never@3156	40	friend class os;
never@3156	41
never@3156	42	// For signal-chaining
never@3156	43	#define MAXSIGNUM 32
never@3156	44	static struct sigaction sigact[MAXSIGNUM]; // saved preinstalled sigactions
never@3156	45	static unsigned int sigs; // mask of signals that have
never@3156	46	// preinstalled signal handlers
never@3156	47	static bool libjsig_is_loaded; // libjsig that interposes sigaction(),
never@3156	48	// __sigaction(), signal() is loaded
never@3156	49	static struct sigaction *(*get_signal_action)(int);
never@3156	50	static struct sigaction *get_preinstalled_handler(int);
never@3156	51	static void save_preinstalled_handler(int, struct sigaction&);
never@3156	52
never@3156	53	static void check_signal_handler(int sig);
never@3156	54
never@3156	55	// For signal flags diagnostics
never@3156	56	static int sigflags[MAXSIGNUM];
never@3156	57
never@3156	58	static int (*_clock_gettime)(clockid_t, struct timespec *);
never@3156	59
never@3156	60	static GrowableArray<int>* _cpu_to_node;
never@3156	61
never@3156	62	protected:
never@3156	63
never@3156	64	static julong _physical_memory;
never@3156	65	static pthread_t _main_thread;
never@3156	66	static int _page_size;
never@3156	67
never@3156	68	static julong available_memory();
never@3156	69	static julong physical_memory() { return _physical_memory; }
never@3156	70	static void initialize_system_info();
never@3156	71
never@3156	72	static bool supports_variable_stack_size();
never@3156	73
never@3156	74	static void rebuild_cpu_to_node_map();
never@3156	75	static GrowableArray<int>* cpu_to_node() { return _cpu_to_node; }
never@3156	76
never@3156	77	static bool hugetlbfs_sanity_check(bool warn, size_t page_size);
never@3156	78
never@3156	79	public:
never@3156	80
never@3156	81	static void init_thread_fpu_state();
never@3156	82	static pthread_t main_thread(void) { return _main_thread; }
never@3156	83
never@3156	84	static void hotspot_sigmask(Thread* thread);
never@3156	85
never@3156	86	static bool is_initial_thread(void);
never@3156	87
never@3156	88	static int page_size(void) { return _page_size; }
never@3156	89	static void set_page_size(int val) { _page_size = val; }
never@3156	90
never@3156	91	static address ucontext_get_pc(ucontext_t* uc);
never@3156	92	static intptr_t* ucontext_get_sp(ucontext_t* uc);
never@3156	93	static intptr_t* ucontext_get_fp(ucontext_t* uc);
never@3156	94
never@3156	95	// For Analyzer Forte AsyncGetCallTrace profiling support:
never@3156	96	//
never@3156	97	// This interface should be declared in os_bsd_i486.hpp, but
never@3156	98	// that file provides extensions to the os class and not the
never@3156	99	// Bsd class.
never@3156	100	static ExtendedPC fetch_frame_from_ucontext(Thread* thread, ucontext_t* uc,
never@3156	101	intptr_t** ret_sp, intptr_t** ret_fp);
never@3156	102
never@3156	103	// This boolean allows users to forward their own non-matching signals
never@3156	104	// to JVM_handle_bsd_signal, harmlessly.
never@3156	105	static bool signal_handlers_are_installed;
never@3156	106
never@3156	107	static int get_our_sigflags(int);
never@3156	108	static void set_our_sigflags(int, int);
never@3156	109	static void signal_sets_init();
never@3156	110	static void install_signal_handlers();
never@3156	111	static void set_signal_handler(int, bool);
never@3156	112	static bool is_sig_ignored(int sig);
never@3156	113
never@3156	114	static sigset_t* unblocked_signals();
never@3156	115	static sigset_t* vm_signals();
never@3156	116	static sigset_t* allowdebug_blocked_signals();
never@3156	117
never@3156	118	// For signal-chaining
never@3156	119	static struct sigaction *get_chained_signal_action(int sig);
never@3156	120	static bool chained_handler(int sig, siginfo_t* siginfo, void* context);
never@3156	121
never@3156	122	// Minimum stack size a thread can be created with (allowing
never@3156	123	// the VM to completely create the thread and enter user code)
never@3156	124	static size_t min_stack_allowed;
never@3156	125
never@3156	126	// Return default stack size or guard size for the specified thread type
never@3156	127	static size_t default_stack_size(os::ThreadType thr_type);
never@3156	128	static size_t default_guard_size(os::ThreadType thr_type);
never@3156	129
never@3156	130	// Real-time clock functions
never@3156	131	static void clock_init(void);
never@3156	132
johnc@4017	133	static inline bool supports_monotonic_clock() {
never@3156	134	return _clock_gettime != NULL;
never@3156	135	}
never@3156	136
never@3156	137	static int clock_gettime(clockid_t clock_id, struct timespec *tp) {
never@3156	138	return _clock_gettime ? _clock_gettime(clock_id, tp) : -1;
never@3156	139	}
never@3156	140
never@3156	141	// Stack repair handling
never@3156	142
never@3156	143	// none present
never@3156	144
never@3156	145	// BsdThreads work-around for 6292965
never@3156	146	static int safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime);
never@3156	147
never@3156	148
never@3156	149	// Bsd suspend/resume support - this helper is a shadow of its former
never@3156	150	// self now that low-level suspension is barely used, and old workarounds
never@3156	151	// for BsdThreads are no longer needed.
never@3156	152	class SuspendResume {
never@3156	153	private:
never@3156	154	volatile int _suspend_action;
never@3156	155	// values for suspend_action:
never@3156	156	#define SR_NONE (0x00)
never@3156	157	#define SR_SUSPEND (0x01) // suspend request
never@3156	158	#define SR_CONTINUE (0x02) // resume request
never@3156	159
never@3156	160	volatile jint _state;
never@3156	161	// values for _state: + SR_NONE
never@3156	162	#define SR_SUSPENDED (0x20)
never@3156	163	public:
never@3156	164	SuspendResume() { _suspend_action = SR_NONE; _state = SR_NONE; }
never@3156	165
never@3156	166	int suspend_action() const { return _suspend_action; }
never@3156	167	void set_suspend_action(int x) { _suspend_action = x; }
never@3156	168
never@3156	169	// atomic updates for _state
never@3156	170	void set_suspended() {
never@3156	171	jint temp, temp2;
never@3156	172	do {
never@3156	173	temp = _state;
never@3156	174	temp2 = Atomic::cmpxchg(temp | SR_SUSPENDED, &_state, temp);
never@3156	175	} while (temp2 != temp);
never@3156	176	}
never@3156	177	void clear_suspended() {
never@3156	178	jint temp, temp2;
never@3156	179	do {
never@3156	180	temp = _state;
never@3156	181	temp2 = Atomic::cmpxchg(temp & ~SR_SUSPENDED, &_state, temp);
never@3156	182	} while (temp2 != temp);
never@3156	183	}
never@3156	184	bool is_suspended() { return _state & SR_SUSPENDED; }
never@3156	185
never@3156	186	#undef SR_SUSPENDED
never@3156	187	};
never@3156	188
never@3156	189	private:
never@3156	190	typedef int (*sched_getcpu_func_t)(void);
never@3156	191	typedef int (*numa_node_to_cpus_func_t)(int node, unsigned long *buffer, int bufferlen);
never@3156	192	typedef int (*numa_max_node_func_t)(void);
never@3156	193	typedef int (*numa_available_func_t)(void);
never@3156	194	typedef int (*numa_tonode_memory_func_t)(void *start, size_t size, int node);
never@3156	195	typedef void (*numa_interleave_memory_func_t)(void *start, size_t size, unsigned long *nodemask);
never@3156	196
never@3156	197	static sched_getcpu_func_t _sched_getcpu;
never@3156	198	static numa_node_to_cpus_func_t _numa_node_to_cpus;
never@3156	199	static numa_max_node_func_t _numa_max_node;
never@3156	200	static numa_available_func_t _numa_available;
never@3156	201	static numa_tonode_memory_func_t _numa_tonode_memory;
never@3156	202	static numa_interleave_memory_func_t _numa_interleave_memory;
never@3156	203	static unsigned long* _numa_all_nodes;
never@3156	204
never@3156	205	static void set_sched_getcpu(sched_getcpu_func_t func) { _sched_getcpu = func; }
never@3156	206	static void set_numa_node_to_cpus(numa_node_to_cpus_func_t func) { _numa_node_to_cpus = func; }
never@3156	207	static void set_numa_max_node(numa_max_node_func_t func) { _numa_max_node = func; }
never@3156	208	static void set_numa_available(numa_available_func_t func) { _numa_available = func; }
never@3156	209	static void set_numa_tonode_memory(numa_tonode_memory_func_t func) { _numa_tonode_memory = func; }
never@3156	210	static void set_numa_interleave_memory(numa_interleave_memory_func_t func) { _numa_interleave_memory = func; }
never@3156	211	static void set_numa_all_nodes(unsigned long* ptr) { _numa_all_nodes = ptr; }
never@3156	212	public:
never@3156	213	static int sched_getcpu() { return _sched_getcpu != NULL ? _sched_getcpu() : -1; }
never@3156	214	static int numa_node_to_cpus(int node, unsigned long *buffer, int bufferlen) {
never@3156	215	return _numa_node_to_cpus != NULL ? _numa_node_to_cpus(node, buffer, bufferlen) : -1;
never@3156	216	}
never@3156	217	static int numa_max_node() { return _numa_max_node != NULL ? _numa_max_node() : -1; }
never@3156	218	static int numa_available() { return _numa_available != NULL ? _numa_available() : -1; }
never@3156	219	static int numa_tonode_memory(void *start, size_t size, int node) {
never@3156	220	return _numa_tonode_memory != NULL ? _numa_tonode_memory(start, size, node) : -1;
never@3156	221	}
never@3156	222	static void numa_interleave_memory(void *start, size_t size) {
never@3156	223	if (_numa_interleave_memory != NULL && _numa_all_nodes != NULL) {
never@3156	224	_numa_interleave_memory(start, size, _numa_all_nodes);
never@3156	225	}
never@3156	226	}
never@3156	227	static int get_node_by_cpu(int cpu_id);
never@3156	228	};
never@3156	229
never@3156	230
zgu@3900	231	class PlatformEvent : public CHeapObj<mtInternal> {
never@3156	232	private:
never@3156	233	double CachePad [4] ; // increase odds that _mutex is sole occupant of cache line
never@3156	234	volatile int _Event ;
never@3156	235	volatile int _nParked ;
never@3156	236	pthread_mutex_t _mutex [1] ;
never@3156	237	pthread_cond_t _cond [1] ;
never@3156	238	double PostPad [2] ;
never@3156	239	Thread * _Assoc ;
never@3156	240
never@3156	241	public: // TODO-FIXME: make dtor private
never@3156	242	~PlatformEvent() { guarantee (0, "invariant") ; }
never@3156	243
never@3156	244	public:
never@3156	245	PlatformEvent() {
never@3156	246	int status;
never@3156	247	status = pthread_cond_init (_cond, NULL);
never@3156	248	assert_status(status == 0, status, "cond_init");
never@3156	249	status = pthread_mutex_init (_mutex, NULL);
never@3156	250	assert_status(status == 0, status, "mutex_init");
never@3156	251	_Event = 0 ;
never@3156	252	_nParked = 0 ;
never@3156	253	_Assoc = NULL ;
never@3156	254	}
never@3156	255
never@3156	256	// Use caution with reset() and fired() -- they may require MEMBARs
never@3156	257	void reset() { _Event = 0 ; }
never@3156	258	int fired() { return _Event; }
never@3156	259	void park () ;
never@3156	260	void unpark () ;
never@3156	261	int TryPark () ;
never@3156	262	int park (jlong millis) ;
never@3156	263	void SetAssociation (Thread * a) { _Assoc = a ; }
never@3156	264	} ;
never@3156	265
zgu@3900	266	class PlatformParker : public CHeapObj<mtInternal> {
never@3156	267	protected:
never@3156	268	pthread_mutex_t _mutex [1] ;
never@3156	269	pthread_cond_t _cond [1] ;
never@3156	270
never@3156	271	public: // TODO-FIXME: make dtor private
never@3156	272	~PlatformParker() { guarantee (0, "invariant") ; }
never@3156	273
never@3156	274	public:
never@3156	275	PlatformParker() {
never@3156	276	int status;
never@3156	277	status = pthread_cond_init (_cond, NULL);
never@3156	278	assert_status(status == 0, status, "cond_init");
never@3156	279	status = pthread_mutex_init (_mutex, NULL);
never@3156	280	assert_status(status == 0, status, "mutex_init");
never@3156	281	}
never@3156	282	} ;
never@3156	283
never@3156	284	#endif // OS_BSD_VM_OS_BSD_HPP