Mercurial > hg > truffle
comparison src/os/linux/vm/os_linux.hpp @ 0:a61af66fc99e jdk7-b24
Initial load
author | duke |
---|---|
date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | fcbfc50865ab |
comparison
equal
deleted
inserted
replaced
-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 } ; |