Mercurial > hg > graal-compiler
annotate src/os/solaris/vm/osThread_solaris.cpp @ 4559:723df37192d6
Make it possible again to build a real client libjvm, drop the UseGraal flag.
Use the --vm option instead of a special -vm option in the bench command
author | Gilles Duboscq <duboscq@ssw.jku.at> |
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date | Fri, 10 Feb 2012 17:04:03 +0100 |
parents | f95d63e2154a |
children | cd3d6a6b95d9 |
rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 1998, 2010, Oracle and/or its affiliates. All rights reserved. |
0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 // no precompiled headers |
26 #include "runtime/atomic.hpp" | |
27 #include "runtime/handles.inline.hpp" | |
28 #include "runtime/mutexLocker.hpp" | |
29 #include "runtime/os.hpp" | |
30 #include "runtime/osThread.hpp" | |
31 #include "runtime/safepoint.hpp" | |
32 #include "runtime/vmThread.hpp" | |
33 #ifdef TARGET_ARCH_x86 | |
34 # include "assembler_x86.inline.hpp" | |
35 #endif | |
36 #ifdef TARGET_ARCH_sparc | |
37 # include "assembler_sparc.inline.hpp" | |
38 #endif | |
39 | |
0 | 40 # include <signal.h> |
41 | |
42 // *************************************************************** | |
43 // Platform dependent initialization and cleanup | |
44 // *************************************************************** | |
45 | |
46 void OSThread::pd_initialize() { | |
47 _thread_id = 0; | |
48 sigemptyset(&_caller_sigmask); | |
49 | |
50 _current_callback = NULL; | |
51 _current_callback_lock = VM_Version::supports_compare_and_exchange() ? NULL | |
52 : new Mutex(Mutex::suspend_resume, "Callback_lock", true); | |
53 | |
54 _saved_interrupt_thread_state = _thread_new; | |
55 _vm_created_thread = false; | |
56 } | |
57 | |
58 void OSThread::pd_destroy() { | |
59 } | |
60 | |
61 // Synchronous interrupt support | |
62 // | |
63 // _current_callback == NULL no pending callback | |
64 // == 1 callback_in_progress | |
65 // == other value pointer to the pending callback | |
66 // | |
67 | |
68 // CAS on v8 is implemented by using a global atomic_memory_operation_lock, | |
69 // which is shared by other atomic functions. It is OK for normal uses, but | |
70 // dangerous if used after some thread is suspended or if used in signal | |
71 // handlers. Instead here we use a special per-thread lock to synchronize | |
72 // updating _current_callback if we are running on v8. Note in general trying | |
73 // to grab locks after a thread is suspended is not safe, but it is safe for | |
74 // updating _current_callback, because synchronous interrupt callbacks are | |
75 // currently only used in: | |
76 // 1. GetThreadPC_Callback - used by WatcherThread to profile VM thread | |
77 // There is no overlap between the callbacks, which means we won't try to | |
78 // grab a thread's sync lock after the thread has been suspended while holding | |
79 // the same lock. | |
80 | |
81 // used after a thread is suspended | |
82 static intptr_t compare_and_exchange_current_callback ( | |
83 intptr_t callback, intptr_t *addr, intptr_t compare_value, Mutex *sync) { | |
84 if (VM_Version::supports_compare_and_exchange()) { | |
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85 return Atomic::cmpxchg_ptr(callback, addr, compare_value); |
0 | 86 } else { |
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87 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); |
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88 if (*addr == compare_value) { |
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89 *addr = callback; |
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90 return compare_value; |
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91 } else { |
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92 return callback; |
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93 } |
0 | 94 } |
95 } | |
96 | |
97 // used in signal handler | |
98 static intptr_t exchange_current_callback(intptr_t callback, intptr_t *addr, Mutex *sync) { | |
99 if (VM_Version::supports_compare_and_exchange()) { | |
100 return Atomic::xchg_ptr(callback, addr); | |
101 } else { | |
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102 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); |
0 | 103 intptr_t cb = *addr; |
104 *addr = callback; | |
105 return cb; | |
106 } | |
107 } | |
108 | |
109 // one interrupt at a time. spin if _current_callback != NULL | |
110 int OSThread::set_interrupt_callback(Sync_Interrupt_Callback * cb) { | |
111 int count = 0; | |
112 while (compare_and_exchange_current_callback( | |
113 (intptr_t)cb, (intptr_t *)&_current_callback, (intptr_t)NULL, _current_callback_lock) != NULL) { | |
114 while (_current_callback != NULL) { | |
115 count++; | |
116 #ifdef ASSERT | |
117 if ((WarnOnStalledSpinLock > 0) && | |
118 (count % WarnOnStalledSpinLock == 0)) { | |
119 warning("_current_callback seems to be stalled: %p", _current_callback); | |
120 } | |
121 #endif | |
122 os::yield_all(count); | |
123 } | |
124 } | |
125 return 0; | |
126 } | |
127 | |
128 // reset _current_callback, spin if _current_callback is callback_in_progress | |
129 void OSThread::remove_interrupt_callback(Sync_Interrupt_Callback * cb) { | |
130 int count = 0; | |
131 while (compare_and_exchange_current_callback( | |
132 (intptr_t)NULL, (intptr_t *)&_current_callback, (intptr_t)cb, _current_callback_lock) != (intptr_t)cb) { | |
133 #ifdef ASSERT | |
134 intptr_t p = (intptr_t)_current_callback; | |
135 assert(p == (intptr_t)callback_in_progress || | |
136 p == (intptr_t)cb, "wrong _current_callback value"); | |
137 #endif | |
138 while (_current_callback != cb) { | |
139 count++; | |
140 #ifdef ASSERT | |
141 if ((WarnOnStalledSpinLock > 0) && | |
142 (count % WarnOnStalledSpinLock == 0)) { | |
143 warning("_current_callback seems to be stalled: %p", _current_callback); | |
144 } | |
145 #endif | |
146 os::yield_all(count); | |
147 } | |
148 } | |
149 } | |
150 | |
151 void OSThread::do_interrupt_callbacks_at_interrupt(InterruptArguments *args) { | |
152 Sync_Interrupt_Callback * cb; | |
153 cb = (Sync_Interrupt_Callback *)exchange_current_callback( | |
154 (intptr_t)callback_in_progress, (intptr_t *)&_current_callback, _current_callback_lock); | |
155 | |
156 if (cb == NULL) { | |
157 // signal is delivered too late (thread is masking interrupt signal??). | |
158 // there is nothing we need to do because requesting thread has given up. | |
159 } else if ((intptr_t)cb == (intptr_t)callback_in_progress) { | |
160 fatal("invalid _current_callback state"); | |
161 } else { | |
162 assert(cb->target()->osthread() == this, "wrong target"); | |
163 cb->execute(args); | |
164 cb->leave_callback(); // notify the requester | |
165 } | |
166 | |
167 // restore original _current_callback value | |
168 intptr_t p; | |
169 p = exchange_current_callback((intptr_t)cb, (intptr_t *)&_current_callback, _current_callback_lock); | |
170 assert(p == (intptr_t)callback_in_progress, "just checking"); | |
171 } | |
172 | |
173 // Called by the requesting thread to send a signal to target thread and | |
174 // execute "this" callback from the signal handler. | |
175 int OSThread::Sync_Interrupt_Callback::interrupt(Thread * target, int timeout) { | |
176 // Let signals to the vm_thread go even if the Threads_lock is not acquired | |
177 assert(Threads_lock->owned_by_self() || (target == VMThread::vm_thread()), | |
178 "must have threads lock to call this"); | |
179 | |
180 OSThread * osthread = target->osthread(); | |
181 | |
182 // may block if target thread already has a pending callback | |
183 osthread->set_interrupt_callback(this); | |
184 | |
185 _target = target; | |
186 | |
187 int rslt = thr_kill(osthread->thread_id(), os::Solaris::SIGasync()); | |
188 assert(rslt == 0, "thr_kill != 0"); | |
189 | |
190 bool status = false; | |
191 jlong t1 = os::javaTimeMillis(); | |
192 { // don't use safepoint check because we might be the watcher thread. | |
193 MutexLockerEx ml(_sync, Mutex::_no_safepoint_check_flag); | |
194 while (!is_done()) { | |
195 status = _sync->wait(Mutex::_no_safepoint_check_flag, timeout); | |
196 | |
197 // status == true if timed out | |
198 if (status) break; | |
199 | |
200 // update timeout | |
201 jlong t2 = os::javaTimeMillis(); | |
202 timeout -= t2 - t1; | |
203 t1 = t2; | |
204 } | |
205 } | |
206 | |
207 // reset current_callback | |
208 osthread->remove_interrupt_callback(this); | |
209 | |
210 return status; | |
211 } | |
212 | |
213 void OSThread::Sync_Interrupt_Callback::leave_callback() { | |
214 if (!_sync->owned_by_self()) { | |
215 // notify requesting thread | |
216 MutexLockerEx ml(_sync, Mutex::_no_safepoint_check_flag); | |
217 _is_done = true; | |
218 _sync->notify_all(); | |
219 } else { | |
220 // Current thread is interrupted while it is holding the _sync lock, trying | |
221 // to grab it again will deadlock. The requester will timeout anyway, | |
222 // so just return. | |
223 _is_done = true; | |
224 } | |
225 } | |
226 | |
227 // copied from synchronizer.cpp | |
228 | |
229 void OSThread::handle_spinlock_contention(int tries) { | |
230 if (NoYieldsInMicrolock) return; | |
231 | |
232 if (tries > 10) { | |
233 os::yield_all(tries); // Yield to threads of any priority | |
234 } else if (tries > 5) { | |
235 os::yield(); // Yield to threads of same or higher priority | |
236 } | |
237 } |