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comparison src/os/linux/vm/os_linux.hpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 1999-2007 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 // Linux_OS defines the interface to Linux operating systems
26
27 /* pthread_getattr_np comes with LinuxThreads-0.9-7 on RedHat 7.1 */
28 typedef int (*pthread_getattr_func_type) (pthread_t, pthread_attr_t *);
29
30 class Linux {
31 friend class os;
32
33 // For signal-chaining
34 #define MAXSIGNUM 32
35 static struct sigaction sigact[MAXSIGNUM]; // saved preinstalled sigactions
36 static unsigned int sigs; // mask of signals that have
37 // preinstalled signal handlers
38 static bool libjsig_is_loaded; // libjsig that interposes sigaction(),
39 // __sigaction(), signal() is loaded
40 static struct sigaction *(*get_signal_action)(int);
41 static struct sigaction *get_preinstalled_handler(int);
42 static void save_preinstalled_handler(int, struct sigaction&);
43
44 static void check_signal_handler(int sig);
45
46 // For signal flags diagnostics
47 static int sigflags[MAXSIGNUM];
48
49 static int (*_clock_gettime)(clockid_t, struct timespec *);
50 static int (*_pthread_getcpuclockid)(pthread_t, clockid_t *);
51
52 static address _initial_thread_stack_bottom;
53 static uintptr_t _initial_thread_stack_size;
54
55 static char *_glibc_version;
56 static char *_libpthread_version;
57
58 static bool _is_floating_stack;
59 static bool _is_NPTL;
60 static bool _supports_fast_thread_cpu_time;
61
62 protected:
63
64 static julong _physical_memory;
65 static pthread_t _main_thread;
66 static Mutex* _createThread_lock;
67 static int _page_size;
68
69 static julong available_memory();
70 static julong physical_memory() { return _physical_memory; }
71 static void initialize_system_info();
72
73 static void set_glibc_version(char *s) { _glibc_version = s; }
74 static void set_libpthread_version(char *s) { _libpthread_version = s; }
75
76 static bool supports_variable_stack_size();
77
78 static void set_is_NPTL() { _is_NPTL = true; }
79 static void set_is_LinuxThreads() { _is_NPTL = false; }
80 static void set_is_floating_stack() { _is_floating_stack = true; }
81
82 public:
83
84 static void init_thread_fpu_state();
85 static int get_fpu_control_word();
86 static void set_fpu_control_word(int fpu_control);
87 static pthread_t main_thread(void) { return _main_thread; }
88 // returns kernel thread id (similar to LWP id on Solaris), which can be
89 // used to access /proc
90 static pid_t gettid();
91 static void set_createThread_lock(Mutex* lk) { _createThread_lock = lk; }
92 static Mutex* createThread_lock(void) { return _createThread_lock; }
93 static void hotspot_sigmask(Thread* thread);
94
95 static address initial_thread_stack_bottom(void) { return _initial_thread_stack_bottom; }
96 static uintptr_t initial_thread_stack_size(void) { return _initial_thread_stack_size; }
97 static bool is_initial_thread(void);
98
99 static int page_size(void) { return _page_size; }
100 static void set_page_size(int val) { _page_size = val; }
101
102 static address ucontext_get_pc(ucontext_t* uc);
103 static intptr_t* ucontext_get_sp(ucontext_t* uc);
104 static intptr_t* ucontext_get_fp(ucontext_t* uc);
105
106 // For Analyzer Forte AsyncGetCallTrace profiling support:
107 //
108 // This interface should be declared in os_linux_i486.hpp, but
109 // that file provides extensions to the os class and not the
110 // Linux class.
111 static ExtendedPC fetch_frame_from_ucontext(Thread* thread, ucontext_t* uc,
112 intptr_t** ret_sp, intptr_t** ret_fp);
113
114 // This boolean allows users to forward their own non-matching signals
115 // to JVM_handle_linux_signal, harmlessly.
116 static bool signal_handlers_are_installed;
117
118 static int get_our_sigflags(int);
119 static void set_our_sigflags(int, int);
120 static void signal_sets_init();
121 static void install_signal_handlers();
122 static void set_signal_handler(int, bool);
123 static bool is_sig_ignored(int sig);
124
125 static sigset_t* unblocked_signals();
126 static sigset_t* vm_signals();
127 static sigset_t* allowdebug_blocked_signals();
128
129 // For signal-chaining
130 static struct sigaction *get_chained_signal_action(int sig);
131 static bool chained_handler(int sig, siginfo_t* siginfo, void* context);
132
133 // GNU libc and libpthread version strings
134 static char *glibc_version() { return _glibc_version; }
135 static char *libpthread_version() { return _libpthread_version; }
136
137 // NPTL or LinuxThreads?
138 static bool is_LinuxThreads() { return !_is_NPTL; }
139 static bool is_NPTL() { return _is_NPTL; }
140
141 // NPTL is always floating stack. LinuxThreads could be using floating
142 // stack or fixed stack.
143 static bool is_floating_stack() { return _is_floating_stack; }
144
145 static void libpthread_init();
146
147 // Minimum stack size a thread can be created with (allowing
148 // the VM to completely create the thread and enter user code)
149 static size_t min_stack_allowed;
150
151 // Return default stack size or guard size for the specified thread type
152 static size_t default_stack_size(os::ThreadType thr_type);
153 static size_t default_guard_size(os::ThreadType thr_type);
154
155 static void capture_initial_stack(size_t max_size);
156
157 // Stack overflow handling
158 static bool manually_expand_stack(JavaThread * t, address addr);
159 static int max_register_window_saves_before_flushing();
160
161 // Real-time clock functions
162 static void clock_init(void);
163
164 // fast POSIX clocks support
165 static void fast_thread_clock_init(void);
166
167 static bool supports_monotonic_clock() {
168 return _clock_gettime != NULL;
169 }
170
171 static int clock_gettime(clockid_t clock_id, struct timespec *tp) {
172 return _clock_gettime ? _clock_gettime(clock_id, tp) : -1;
173 }
174
175 static int pthread_getcpuclockid(pthread_t tid, clockid_t *clock_id) {
176 return _pthread_getcpuclockid ? _pthread_getcpuclockid(tid, clock_id) : -1;
177 }
178
179 static bool supports_fast_thread_cpu_time() {
180 return _supports_fast_thread_cpu_time;
181 }
182
183 static jlong fast_thread_cpu_time(clockid_t clockid);
184
185 // Stack repair handling
186
187 // none present
188
189 // LinuxThreads work-around for 6292965
190 static int safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime);
191
192
193 // Linux suspend/resume support - this helper is a shadow of its former
194 // self now that low-level suspension is barely used, and old workarounds
195 // for LinuxThreads are no longer needed.
196 class SuspendResume {
197 private:
198 volatile int _suspend_action;
199 // values for suspend_action:
200 #define SR_NONE (0x00)
201 #define SR_SUSPEND (0x01) // suspend request
202 #define SR_CONTINUE (0x02) // resume request
203
204 volatile jint _state;
205 // values for _state: + SR_NONE
206 #define SR_SUSPENDED (0x20)
207 public:
208 SuspendResume() { _suspend_action = SR_NONE; _state = SR_NONE; }
209
210 int suspend_action() const { return _suspend_action; }
211 void set_suspend_action(int x) { _suspend_action = x; }
212
213 // atomic updates for _state
214 void set_suspended() {
215 jint temp, temp2;
216 do {
217 temp = _state;
218 temp2 = Atomic::cmpxchg(temp | SR_SUSPENDED, &_state, temp);
219 } while (temp2 != temp);
220 }
221 void clear_suspended() {
222 jint temp, temp2;
223 do {
224 temp = _state;
225 temp2 = Atomic::cmpxchg(temp & ~SR_SUSPENDED, &_state, temp);
226 } while (temp2 != temp);
227 }
228 bool is_suspended() { return _state & SR_SUSPENDED; }
229
230 #undef SR_SUSPENDED
231 };
232 };
233
234
235 class PlatformEvent : public CHeapObj {
236 private:
237 double CachePad [4] ; // increase odds that _mutex is sole occupant of cache line
238 volatile int _Event ;
239 volatile int _nParked ;
240 pthread_mutex_t _mutex [1] ;
241 pthread_cond_t _cond [1] ;
242 double PostPad [2] ;
243 Thread * _Assoc ;
244
245 public: // TODO-FIXME: make dtor private
246 ~PlatformEvent() { guarantee (0, "invariant") ; }
247
248 public:
249 PlatformEvent() {
250 int status;
251 status = pthread_cond_init (_cond, NULL);
252 assert_status(status == 0, status, "cond_init");
253 status = pthread_mutex_init (_mutex, NULL);
254 assert_status(status == 0, status, "mutex_init");
255 _Event = 0 ;
256 _nParked = 0 ;
257 _Assoc = NULL ;
258 }
259
260 // Use caution with reset() and fired() -- they may require MEMBARs
261 void reset() { _Event = 0 ; }
262 int fired() { return _Event; }
263 void park () ;
264 void unpark () ;
265 int TryPark () ;
266 int park (jlong millis) ;
267 void SetAssociation (Thread * a) { _Assoc = a ; }
268 } ;
269
270 class PlatformParker : public CHeapObj {
271 protected:
272 pthread_mutex_t _mutex [1] ;
273 pthread_cond_t _cond [1] ;
274
275 public: // TODO-FIXME: make dtor private
276 ~PlatformParker() { guarantee (0, "invariant") ; }
277
278 public:
279 PlatformParker() {
280 int status;
281 status = pthread_cond_init (_cond, NULL);
282 assert_status(status == 0, status, "cond_init");
283 status = pthread_mutex_init (_mutex, NULL);
284 assert_status(status == 0, status, "mutex_init");
285 }
286 } ;