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src/os/linux/vm/os_linux.hpp@14509df4cd63 (annotated)

src/os/linux/vm/os_linux.hpp

Thu, 21 Mar 2013 20:46:46 -0700

author

iklam

date

Thu, 21 Mar 2013 20:46:46 -0700

changeset 4812

14509df4cd63

parent 4710

9058789475af

child 4996

b4081e9714ec

permissions

-rw-r--r--

8010389: After fix for 7107135 a failed dlopen() call results in a VM crash
Summary: Call dlerror() in VM thread as necessary.
Reviewed-by: coleenp, dholmes

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
duke@435	33	class Linux {
duke@435	34	friend class os;
duke@435	35
duke@435	36	// For signal-chaining
duke@435	37	#define MAXSIGNUM 32
duke@435	38	static struct sigaction sigact[MAXSIGNUM]; // saved preinstalled sigactions
duke@435	39	static unsigned int sigs; // mask of signals that have
duke@435	40	// preinstalled signal handlers
duke@435	41	static bool libjsig_is_loaded; // libjsig that interposes sigaction(),
duke@435	42	// __sigaction(), signal() is loaded
duke@435	43	static struct sigaction *(*get_signal_action)(int);
duke@435	44	static struct sigaction *get_preinstalled_handler(int);
duke@435	45	static void save_preinstalled_handler(int, struct sigaction&);
duke@435	46
duke@435	47	static void check_signal_handler(int sig);
duke@435	48
duke@435	49	// For signal flags diagnostics
duke@435	50	static int sigflags[MAXSIGNUM];
duke@435	51
duke@435	52	static int (*_clock_gettime)(clockid_t, struct timespec *);
duke@435	53	static int (*_pthread_getcpuclockid)(pthread_t, clockid_t *);
duke@435	54
duke@435	55	static address _initial_thread_stack_bottom;
duke@435	56	static uintptr_t _initial_thread_stack_size;
duke@435	57
xlu@634	58	static const char *_glibc_version;
xlu@634	59	static const char *_libpthread_version;
duke@435	60
duke@435	61	static bool _is_floating_stack;
duke@435	62	static bool _is_NPTL;
duke@435	63	static bool _supports_fast_thread_cpu_time;
duke@435	64
iveresov@576	65	static GrowableArray<int>* _cpu_to_node;
iveresov@576	66
duke@435	67	protected:
duke@435	68
duke@435	69	static julong _physical_memory;
duke@435	70	static pthread_t _main_thread;
duke@435	71	static Mutex* _createThread_lock;
duke@435	72	static int _page_size;
duke@435	73
duke@435	74	static julong available_memory();
duke@435	75	static julong physical_memory() { return _physical_memory; }
duke@435	76	static void initialize_system_info();
duke@435	77
xlu@634	78	static void set_glibc_version(const char *s) { _glibc_version = s; }
xlu@634	79	static void set_libpthread_version(const char *s) { _libpthread_version = s; }
duke@435	80
duke@435	81	static bool supports_variable_stack_size();
duke@435	82
duke@435	83	static void set_is_NPTL() { _is_NPTL = true; }
duke@435	84	static void set_is_LinuxThreads() { _is_NPTL = false; }
duke@435	85	static void set_is_floating_stack() { _is_floating_stack = true; }
duke@435	86
iveresov@576	87	static void rebuild_cpu_to_node_map();
iveresov@576	88	static GrowableArray<int>* cpu_to_node() { return _cpu_to_node; }
iveresov@2818	89
iveresov@2818	90	static bool hugetlbfs_sanity_check(bool warn, size_t page_size);
iveresov@2818	91
nloodin@3783	92	static void print_full_memory_info(outputStream* st);
nloodin@3783	93	static void print_distro_info(outputStream* st);
nloodin@3783	94	static void print_libversion_info(outputStream* st);
nloodin@3783	95
duke@435	96	public:
iklam@4710	97	static bool _stack_is_executable;
iklam@4812	98	static void *dlopen_helper(const char *name, char *ebuf, int ebuflen);
iklam@4812	99	static void *dll_load_in_vmthread(const char *name, char *ebuf, int ebuflen);
iklam@4710	100
duke@435	101	static void init_thread_fpu_state();
duke@435	102	static int get_fpu_control_word();
duke@435	103	static void set_fpu_control_word(int fpu_control);
duke@435	104	static pthread_t main_thread(void) { return _main_thread; }
duke@435	105	// returns kernel thread id (similar to LWP id on Solaris), which can be
duke@435	106	// used to access /proc
duke@435	107	static pid_t gettid();
duke@435	108	static void set_createThread_lock(Mutex* lk) { _createThread_lock = lk; }
duke@435	109	static Mutex* createThread_lock(void) { return _createThread_lock; }
duke@435	110	static void hotspot_sigmask(Thread* thread);
duke@435	111
duke@435	112	static address initial_thread_stack_bottom(void) { return _initial_thread_stack_bottom; }
duke@435	113	static uintptr_t initial_thread_stack_size(void) { return _initial_thread_stack_size; }
duke@435	114	static bool is_initial_thread(void);
duke@435	115
duke@435	116	static int page_size(void) { return _page_size; }
duke@435	117	static void set_page_size(int val) { _page_size = val; }
duke@435	118
duke@435	119	static address ucontext_get_pc(ucontext_t* uc);
duke@435	120	static intptr_t* ucontext_get_sp(ucontext_t* uc);
duke@435	121	static intptr_t* ucontext_get_fp(ucontext_t* uc);
duke@435	122
duke@435	123	// For Analyzer Forte AsyncGetCallTrace profiling support:
duke@435	124	//
duke@435	125	// This interface should be declared in os_linux_i486.hpp, but
duke@435	126	// that file provides extensions to the os class and not the
duke@435	127	// Linux class.
duke@435	128	static ExtendedPC fetch_frame_from_ucontext(Thread* thread, ucontext_t* uc,
duke@435	129	intptr_t** ret_sp, intptr_t** ret_fp);
duke@435	130
duke@435	131	// This boolean allows users to forward their own non-matching signals
duke@435	132	// to JVM_handle_linux_signal, harmlessly.
duke@435	133	static bool signal_handlers_are_installed;
duke@435	134
duke@435	135	static int get_our_sigflags(int);
duke@435	136	static void set_our_sigflags(int, int);
duke@435	137	static void signal_sets_init();
duke@435	138	static void install_signal_handlers();
duke@435	139	static void set_signal_handler(int, bool);
duke@435	140	static bool is_sig_ignored(int sig);
duke@435	141
duke@435	142	static sigset_t* unblocked_signals();
duke@435	143	static sigset_t* vm_signals();
duke@435	144	static sigset_t* allowdebug_blocked_signals();
duke@435	145
duke@435	146	// For signal-chaining
duke@435	147	static struct sigaction *get_chained_signal_action(int sig);
duke@435	148	static bool chained_handler(int sig, siginfo_t* siginfo, void* context);
duke@435	149
duke@435	150	// GNU libc and libpthread version strings
xlu@634	151	static const char *glibc_version() { return _glibc_version; }
xlu@634	152	static const char *libpthread_version() { return _libpthread_version; }
duke@435	153
duke@435	154	// NPTL or LinuxThreads?
duke@435	155	static bool is_LinuxThreads() { return !_is_NPTL; }
duke@435	156	static bool is_NPTL() { return _is_NPTL; }
duke@435	157
duke@435	158	// NPTL is always floating stack. LinuxThreads could be using floating
duke@435	159	// stack or fixed stack.
duke@435	160	static bool is_floating_stack() { return _is_floating_stack; }
duke@435	161
duke@435	162	static void libpthread_init();
iveresov@897	163	static bool libnuma_init();
iveresov@1198	164	static void* libnuma_dlsym(void* handle, const char* name);
duke@435	165	// Minimum stack size a thread can be created with (allowing
duke@435	166	// the VM to completely create the thread and enter user code)
duke@435	167	static size_t min_stack_allowed;
duke@435	168
duke@435	169	// Return default stack size or guard size for the specified thread type
duke@435	170	static size_t default_stack_size(os::ThreadType thr_type);
duke@435	171	static size_t default_guard_size(os::ThreadType thr_type);
duke@435	172
duke@435	173	static void capture_initial_stack(size_t max_size);
duke@435	174
duke@435	175	// Stack overflow handling
duke@435	176	static bool manually_expand_stack(JavaThread * t, address addr);
duke@435	177	static int max_register_window_saves_before_flushing();
duke@435	178
duke@435	179	// Real-time clock functions
duke@435	180	static void clock_init(void);
duke@435	181
duke@435	182	// fast POSIX clocks support
duke@435	183	static void fast_thread_clock_init(void);
duke@435	184
johnc@4017	185	static inline bool supports_monotonic_clock() {
duke@435	186	return _clock_gettime != NULL;
duke@435	187	}
duke@435	188
duke@435	189	static int clock_gettime(clockid_t clock_id, struct timespec *tp) {
duke@435	190	return _clock_gettime ? _clock_gettime(clock_id, tp) : -1;
duke@435	191	}
duke@435	192
duke@435	193	static int pthread_getcpuclockid(pthread_t tid, clockid_t *clock_id) {
duke@435	194	return _pthread_getcpuclockid ? _pthread_getcpuclockid(tid, clock_id) : -1;
duke@435	195	}
duke@435	196
duke@435	197	static bool supports_fast_thread_cpu_time() {
duke@435	198	return _supports_fast_thread_cpu_time;
duke@435	199	}
duke@435	200
duke@435	201	static jlong fast_thread_cpu_time(clockid_t clockid);
duke@435	202
duke@435	203	// Stack repair handling
duke@435	204
duke@435	205	// none present
duke@435	206
duke@435	207	// LinuxThreads work-around for 6292965
duke@435	208	static int safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime);
duke@435	209
duke@435	210
duke@435	211	// Linux suspend/resume support - this helper is a shadow of its former
duke@435	212	// self now that low-level suspension is barely used, and old workarounds
duke@435	213	// for LinuxThreads are no longer needed.
duke@435	214	class SuspendResume {
duke@435	215	private:
simonis@4675	216	volatile int _suspend_action;
simonis@4675	217	volatile jint _state;
simonis@4675	218	public:
duke@435	219	// values for suspend_action:
simonis@4675	220	enum {
simonis@4675	221	SR_NONE = 0x00,
simonis@4675	222	SR_SUSPEND = 0x01, // suspend request
simonis@4675	223	SR_CONTINUE = 0x02, // resume request
simonis@4675	224	SR_SUSPENDED = 0x20 // values for _state: + SR_NONE
simonis@4675	225	};
duke@435	226
duke@435	227	SuspendResume() { _suspend_action = SR_NONE; _state = SR_NONE; }
duke@435	228
duke@435	229	int suspend_action() const { return _suspend_action; }
duke@435	230	void set_suspend_action(int x) { _suspend_action = x; }
duke@435	231
duke@435	232	// atomic updates for _state
simonis@4675	233	inline void set_suspended();
simonis@4675	234	inline void clear_suspended();
duke@435	235	bool is_suspended() { return _state & SR_SUSPENDED; }
duke@435	236
duke@435	237	};
iveresov@576	238
iveresov@576	239	private:
iveresov@576	240	typedef int (*sched_getcpu_func_t)(void);
iveresov@576	241	typedef int (*numa_node_to_cpus_func_t)(int node, unsigned long *buffer, int bufferlen);
iveresov@576	242	typedef int (*numa_max_node_func_t)(void);
iveresov@576	243	typedef int (*numa_available_func_t)(void);
iveresov@576	244	typedef int (*numa_tonode_memory_func_t)(void *start, size_t size, int node);
iveresov@897	245	typedef void (*numa_interleave_memory_func_t)(void *start, size_t size, unsigned long *nodemask);
iveresov@576	246
iveresov@576	247	static sched_getcpu_func_t _sched_getcpu;
iveresov@576	248	static numa_node_to_cpus_func_t _numa_node_to_cpus;
iveresov@576	249	static numa_max_node_func_t _numa_max_node;
iveresov@576	250	static numa_available_func_t _numa_available;
iveresov@576	251	static numa_tonode_memory_func_t _numa_tonode_memory;
iveresov@897	252	static numa_interleave_memory_func_t _numa_interleave_memory;
iveresov@897	253	static unsigned long* _numa_all_nodes;
iveresov@576	254
iveresov@576	255	static void set_sched_getcpu(sched_getcpu_func_t func) { _sched_getcpu = func; }
iveresov@576	256	static void set_numa_node_to_cpus(numa_node_to_cpus_func_t func) { _numa_node_to_cpus = func; }
iveresov@576	257	static void set_numa_max_node(numa_max_node_func_t func) { _numa_max_node = func; }
iveresov@576	258	static void set_numa_available(numa_available_func_t func) { _numa_available = func; }
iveresov@576	259	static void set_numa_tonode_memory(numa_tonode_memory_func_t func) { _numa_tonode_memory = func; }
iveresov@897	260	static void set_numa_interleave_memory(numa_interleave_memory_func_t func) { _numa_interleave_memory = func; }
iveresov@897	261	static void set_numa_all_nodes(unsigned long* ptr) { _numa_all_nodes = ptr; }
iveresov@3024	262	static int sched_getcpu_syscall(void);
iveresov@576	263	public:
iveresov@576	264	static int sched_getcpu() { return _sched_getcpu != NULL ? _sched_getcpu() : -1; }
iveresov@576	265	static int numa_node_to_cpus(int node, unsigned long *buffer, int bufferlen) {
iveresov@576	266	return _numa_node_to_cpus != NULL ? _numa_node_to_cpus(node, buffer, bufferlen) : -1;
iveresov@576	267	}
iveresov@576	268	static int numa_max_node() { return _numa_max_node != NULL ? _numa_max_node() : -1; }
iveresov@576	269	static int numa_available() { return _numa_available != NULL ? _numa_available() : -1; }
iveresov@576	270	static int numa_tonode_memory(void *start, size_t size, int node) {
iveresov@576	271	return _numa_tonode_memory != NULL ? _numa_tonode_memory(start, size, node) : -1;
iveresov@576	272	}
iveresov@897	273	static void numa_interleave_memory(void *start, size_t size) {
iveresov@897	274	if (_numa_interleave_memory != NULL && _numa_all_nodes != NULL) {
iveresov@897	275	_numa_interleave_memory(start, size, _numa_all_nodes);
iveresov@897	276	}
iveresov@897	277	}
iveresov@576	278	static int get_node_by_cpu(int cpu_id);
duke@435	279	};
duke@435	280
duke@435	281
zgu@3900	282	class PlatformEvent : public CHeapObj<mtInternal> {
duke@435	283	private:
duke@435	284	double CachePad [4] ; // increase odds that _mutex is sole occupant of cache line
duke@435	285	volatile int _Event ;
duke@435	286	volatile int _nParked ;
duke@435	287	pthread_mutex_t _mutex [1] ;
duke@435	288	pthread_cond_t _cond [1] ;
duke@435	289	double PostPad [2] ;
duke@435	290	Thread * _Assoc ;
duke@435	291
duke@435	292	public: // TODO-FIXME: make dtor private
duke@435	293	~PlatformEvent() { guarantee (0, "invariant") ; }
duke@435	294
duke@435	295	public:
duke@435	296	PlatformEvent() {
duke@435	297	int status;
duke@435	298	status = pthread_cond_init (_cond, NULL);
duke@435	299	assert_status(status == 0, status, "cond_init");
duke@435	300	status = pthread_mutex_init (_mutex, NULL);
duke@435	301	assert_status(status == 0, status, "mutex_init");
duke@435	302	_Event = 0 ;
duke@435	303	_nParked = 0 ;
duke@435	304	_Assoc = NULL ;
duke@435	305	}
duke@435	306
duke@435	307	// Use caution with reset() and fired() -- they may require MEMBARs
duke@435	308	void reset() { _Event = 0 ; }
duke@435	309	int fired() { return _Event; }
duke@435	310	void park () ;
duke@435	311	void unpark () ;
duke@435	312	int TryPark () ;
duke@435	313	int park (jlong millis) ;
duke@435	314	void SetAssociation (Thread * a) { _Assoc = a ; }
duke@435	315	} ;
duke@435	316
zgu@3900	317	class PlatformParker : public CHeapObj<mtInternal> {
duke@435	318	protected:
duke@435	319	pthread_mutex_t _mutex [1] ;
duke@435	320	pthread_cond_t _cond [1] ;
duke@435	321
duke@435	322	public: // TODO-FIXME: make dtor private
duke@435	323	~PlatformParker() { guarantee (0, "invariant") ; }
duke@435	324
duke@435	325	public:
duke@435	326	PlatformParker() {
duke@435	327	int status;
duke@435	328	status = pthread_cond_init (_cond, NULL);
duke@435	329	assert_status(status == 0, status, "cond_init");
duke@435	330	status = pthread_mutex_init (_mutex, NULL);
duke@435	331	assert_status(status == 0, status, "mutex_init");
duke@435	332	}
duke@435	333	} ;
stefank@2314	334
stefank@2314	335	#endif // OS_LINUX_VM_OS_LINUX_HPP