Mercurial > hg > graal-compiler
annotate src/os/bsd/vm/os_bsd.hpp @ 9800:2eaac2c3670b
VerifyUsageWithEquals/VerifyPhase: add documentation
author | Bernhard Urban <bernhard.urban@jku.at> |
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date | Thu, 23 May 2013 12:00:40 +0200 |
parents | 63e54c37ac64 |
children | f2110083203d |
rev | line source |
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3960 | 1 /* |
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2 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved. |
3960 | 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
20 * or visit www.oracle.com if you need additional information or have any | |
21 * questions. | |
22 * | |
23 */ | |
24 | |
25 #ifndef OS_BSD_VM_OS_BSD_HPP | |
26 #define OS_BSD_VM_OS_BSD_HPP | |
27 | |
28 // Bsd_OS defines the interface to Bsd operating systems | |
29 | |
30 /* pthread_getattr_np comes with BsdThreads-0.9-7 on RedHat 7.1 */ | |
31 typedef int (*pthread_getattr_func_type) (pthread_t, pthread_attr_t *); | |
32 | |
33 #ifdef __APPLE__ | |
34 // Mac OS X doesn't support clock_gettime. Stub out the type, it is | |
35 // unused | |
36 typedef int clockid_t; | |
37 #endif | |
38 | |
39 class Bsd { | |
40 friend class os; | |
41 | |
42 // For signal-chaining | |
43 #define MAXSIGNUM 32 | |
44 static struct sigaction sigact[MAXSIGNUM]; // saved preinstalled sigactions | |
45 static unsigned int sigs; // mask of signals that have | |
46 // preinstalled signal handlers | |
47 static bool libjsig_is_loaded; // libjsig that interposes sigaction(), | |
48 // __sigaction(), signal() is loaded | |
49 static struct sigaction *(*get_signal_action)(int); | |
50 static struct sigaction *get_preinstalled_handler(int); | |
51 static void save_preinstalled_handler(int, struct sigaction&); | |
52 | |
53 static void check_signal_handler(int sig); | |
54 | |
55 // For signal flags diagnostics | |
56 static int sigflags[MAXSIGNUM]; | |
57 | |
58 static int (*_clock_gettime)(clockid_t, struct timespec *); | |
59 | |
60 static GrowableArray<int>* _cpu_to_node; | |
61 | |
62 protected: | |
63 | |
64 static julong _physical_memory; | |
65 static pthread_t _main_thread; | |
66 static int _page_size; | |
67 | |
68 static julong available_memory(); | |
69 static julong physical_memory() { return _physical_memory; } | |
70 static void initialize_system_info(); | |
71 | |
72 static bool supports_variable_stack_size(); | |
73 | |
74 static void rebuild_cpu_to_node_map(); | |
75 static GrowableArray<int>* cpu_to_node() { return _cpu_to_node; } | |
76 | |
77 static bool hugetlbfs_sanity_check(bool warn, size_t page_size); | |
78 | |
79 public: | |
80 | |
81 static void init_thread_fpu_state(); | |
82 static pthread_t main_thread(void) { return _main_thread; } | |
83 | |
84 static void hotspot_sigmask(Thread* thread); | |
85 | |
86 static bool is_initial_thread(void); | |
87 | |
88 static int page_size(void) { return _page_size; } | |
89 static void set_page_size(int val) { _page_size = val; } | |
90 | |
91 static address ucontext_get_pc(ucontext_t* uc); | |
92 static intptr_t* ucontext_get_sp(ucontext_t* uc); | |
93 static intptr_t* ucontext_get_fp(ucontext_t* uc); | |
94 | |
95 // For Analyzer Forte AsyncGetCallTrace profiling support: | |
96 // | |
97 // This interface should be declared in os_bsd_i486.hpp, but | |
98 // that file provides extensions to the os class and not the | |
99 // Bsd class. | |
100 static ExtendedPC fetch_frame_from_ucontext(Thread* thread, ucontext_t* uc, | |
101 intptr_t** ret_sp, intptr_t** ret_fp); | |
102 | |
103 // This boolean allows users to forward their own non-matching signals | |
104 // to JVM_handle_bsd_signal, harmlessly. | |
105 static bool signal_handlers_are_installed; | |
106 | |
107 static int get_our_sigflags(int); | |
108 static void set_our_sigflags(int, int); | |
109 static void signal_sets_init(); | |
110 static void install_signal_handlers(); | |
111 static void set_signal_handler(int, bool); | |
112 static bool is_sig_ignored(int sig); | |
113 | |
114 static sigset_t* unblocked_signals(); | |
115 static sigset_t* vm_signals(); | |
116 static sigset_t* allowdebug_blocked_signals(); | |
117 | |
118 // For signal-chaining | |
119 static struct sigaction *get_chained_signal_action(int sig); | |
120 static bool chained_handler(int sig, siginfo_t* siginfo, void* context); | |
121 | |
122 // Minimum stack size a thread can be created with (allowing | |
123 // the VM to completely create the thread and enter user code) | |
124 static size_t min_stack_allowed; | |
125 | |
126 // Return default stack size or guard size for the specified thread type | |
127 static size_t default_stack_size(os::ThreadType thr_type); | |
128 static size_t default_guard_size(os::ThreadType thr_type); | |
129 | |
130 // Real-time clock functions | |
131 static void clock_init(void); | |
132 | |
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133 static inline bool supports_monotonic_clock() { |
3960 | 134 return _clock_gettime != NULL; |
135 } | |
136 | |
137 static int clock_gettime(clockid_t clock_id, struct timespec *tp) { | |
138 return _clock_gettime ? _clock_gettime(clock_id, tp) : -1; | |
139 } | |
140 | |
141 // Stack repair handling | |
142 | |
143 // none present | |
144 | |
145 // BsdThreads work-around for 6292965 | |
146 static int safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime); | |
147 | |
148 | |
149 // Bsd suspend/resume support - this helper is a shadow of its former | |
150 // self now that low-level suspension is barely used, and old workarounds | |
151 // for BsdThreads are no longer needed. | |
152 class SuspendResume { | |
153 private: | |
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154 volatile int _suspend_action; |
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155 volatile jint _state; |
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156 public: |
3960 | 157 // values for suspend_action: |
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158 enum { |
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159 SR_NONE = 0x00, |
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160 SR_SUSPEND = 0x01, // suspend request |
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161 SR_CONTINUE = 0x02, // resume request |
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162 SR_SUSPENDED = 0x20 // values for _state: + SR_NONE |
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163 }; |
3960 | 164 |
165 SuspendResume() { _suspend_action = SR_NONE; _state = SR_NONE; } | |
166 | |
167 int suspend_action() const { return _suspend_action; } | |
168 void set_suspend_action(int x) { _suspend_action = x; } | |
169 | |
170 // atomic updates for _state | |
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171 inline void set_suspended(); |
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172 inline void clear_suspended(); |
3960 | 173 bool is_suspended() { return _state & SR_SUSPENDED; } |
174 | |
175 #undef SR_SUSPENDED | |
176 }; | |
177 | |
178 private: | |
179 typedef int (*sched_getcpu_func_t)(void); | |
180 typedef int (*numa_node_to_cpus_func_t)(int node, unsigned long *buffer, int bufferlen); | |
181 typedef int (*numa_max_node_func_t)(void); | |
182 typedef int (*numa_available_func_t)(void); | |
183 typedef int (*numa_tonode_memory_func_t)(void *start, size_t size, int node); | |
184 typedef void (*numa_interleave_memory_func_t)(void *start, size_t size, unsigned long *nodemask); | |
185 | |
186 static sched_getcpu_func_t _sched_getcpu; | |
187 static numa_node_to_cpus_func_t _numa_node_to_cpus; | |
188 static numa_max_node_func_t _numa_max_node; | |
189 static numa_available_func_t _numa_available; | |
190 static numa_tonode_memory_func_t _numa_tonode_memory; | |
191 static numa_interleave_memory_func_t _numa_interleave_memory; | |
192 static unsigned long* _numa_all_nodes; | |
193 | |
194 static void set_sched_getcpu(sched_getcpu_func_t func) { _sched_getcpu = func; } | |
195 static void set_numa_node_to_cpus(numa_node_to_cpus_func_t func) { _numa_node_to_cpus = func; } | |
196 static void set_numa_max_node(numa_max_node_func_t func) { _numa_max_node = func; } | |
197 static void set_numa_available(numa_available_func_t func) { _numa_available = func; } | |
198 static void set_numa_tonode_memory(numa_tonode_memory_func_t func) { _numa_tonode_memory = func; } | |
199 static void set_numa_interleave_memory(numa_interleave_memory_func_t func) { _numa_interleave_memory = func; } | |
200 static void set_numa_all_nodes(unsigned long* ptr) { _numa_all_nodes = ptr; } | |
201 public: | |
202 static int sched_getcpu() { return _sched_getcpu != NULL ? _sched_getcpu() : -1; } | |
203 static int numa_node_to_cpus(int node, unsigned long *buffer, int bufferlen) { | |
204 return _numa_node_to_cpus != NULL ? _numa_node_to_cpus(node, buffer, bufferlen) : -1; | |
205 } | |
206 static int numa_max_node() { return _numa_max_node != NULL ? _numa_max_node() : -1; } | |
207 static int numa_available() { return _numa_available != NULL ? _numa_available() : -1; } | |
208 static int numa_tonode_memory(void *start, size_t size, int node) { | |
209 return _numa_tonode_memory != NULL ? _numa_tonode_memory(start, size, node) : -1; | |
210 } | |
211 static void numa_interleave_memory(void *start, size_t size) { | |
212 if (_numa_interleave_memory != NULL && _numa_all_nodes != NULL) { | |
213 _numa_interleave_memory(start, size, _numa_all_nodes); | |
214 } | |
215 } | |
216 static int get_node_by_cpu(int cpu_id); | |
217 }; | |
218 | |
219 | |
6197 | 220 class PlatformEvent : public CHeapObj<mtInternal> { |
3960 | 221 private: |
222 double CachePad [4] ; // increase odds that _mutex is sole occupant of cache line | |
223 volatile int _Event ; | |
224 volatile int _nParked ; | |
225 pthread_mutex_t _mutex [1] ; | |
226 pthread_cond_t _cond [1] ; | |
227 double PostPad [2] ; | |
228 Thread * _Assoc ; | |
229 | |
230 public: // TODO-FIXME: make dtor private | |
231 ~PlatformEvent() { guarantee (0, "invariant") ; } | |
232 | |
233 public: | |
234 PlatformEvent() { | |
235 int status; | |
236 status = pthread_cond_init (_cond, NULL); | |
237 assert_status(status == 0, status, "cond_init"); | |
238 status = pthread_mutex_init (_mutex, NULL); | |
239 assert_status(status == 0, status, "mutex_init"); | |
240 _Event = 0 ; | |
241 _nParked = 0 ; | |
242 _Assoc = NULL ; | |
243 } | |
244 | |
245 // Use caution with reset() and fired() -- they may require MEMBARs | |
246 void reset() { _Event = 0 ; } | |
247 int fired() { return _Event; } | |
248 void park () ; | |
249 void unpark () ; | |
250 int TryPark () ; | |
251 int park (jlong millis) ; | |
252 void SetAssociation (Thread * a) { _Assoc = a ; } | |
253 } ; | |
254 | |
6197 | 255 class PlatformParker : public CHeapObj<mtInternal> { |
3960 | 256 protected: |
257 pthread_mutex_t _mutex [1] ; | |
258 pthread_cond_t _cond [1] ; | |
259 | |
260 public: // TODO-FIXME: make dtor private | |
261 ~PlatformParker() { guarantee (0, "invariant") ; } | |
262 | |
263 public: | |
264 PlatformParker() { | |
265 int status; | |
266 status = pthread_cond_init (_cond, NULL); | |
267 assert_status(status == 0, status, "cond_init"); | |
268 status = pthread_mutex_init (_mutex, NULL); | |
269 assert_status(status == 0, status, "mutex_init"); | |
270 } | |
271 } ; | |
272 | |
273 #endif // OS_BSD_VM_OS_BSD_HPP |