Mercurial > hg > graal-compiler
annotate src/os/solaris/vm/osThread_solaris.cpp @ 7199:cd3d6a6b95d9
8003240: x86: move MacroAssembler into separate file
Reviewed-by: kvn
| author | twisti |
|---|---|
| date | Fri, 30 Nov 2012 15:23:16 -0800 |
| parents | f95d63e2154a |
| children | f2110083203d |
| rev | line source |
|---|---|
| 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 | |
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34 #include <signal.h> |
| 0 | 35 |
| 36 // *************************************************************** | |
| 37 // Platform dependent initialization and cleanup | |
| 38 // *************************************************************** | |
| 39 | |
| 40 void OSThread::pd_initialize() { | |
| 41 _thread_id = 0; | |
| 42 sigemptyset(&_caller_sigmask); | |
| 43 | |
| 44 _current_callback = NULL; | |
| 45 _current_callback_lock = VM_Version::supports_compare_and_exchange() ? NULL | |
| 46 : new Mutex(Mutex::suspend_resume, "Callback_lock", true); | |
| 47 | |
| 48 _saved_interrupt_thread_state = _thread_new; | |
| 49 _vm_created_thread = false; | |
| 50 } | |
| 51 | |
| 52 void OSThread::pd_destroy() { | |
| 53 } | |
| 54 | |
| 55 // Synchronous interrupt support | |
| 56 // | |
| 57 // _current_callback == NULL no pending callback | |
| 58 // == 1 callback_in_progress | |
| 59 // == other value pointer to the pending callback | |
| 60 // | |
| 61 | |
| 62 // CAS on v8 is implemented by using a global atomic_memory_operation_lock, | |
| 63 // which is shared by other atomic functions. It is OK for normal uses, but | |
| 64 // dangerous if used after some thread is suspended or if used in signal | |
| 65 // handlers. Instead here we use a special per-thread lock to synchronize | |
| 66 // updating _current_callback if we are running on v8. Note in general trying | |
| 67 // to grab locks after a thread is suspended is not safe, but it is safe for | |
| 68 // updating _current_callback, because synchronous interrupt callbacks are | |
| 69 // currently only used in: | |
| 70 // 1. GetThreadPC_Callback - used by WatcherThread to profile VM thread | |
| 71 // There is no overlap between the callbacks, which means we won't try to | |
| 72 // grab a thread's sync lock after the thread has been suspended while holding | |
| 73 // the same lock. | |
| 74 | |
| 75 // used after a thread is suspended | |
| 76 static intptr_t compare_and_exchange_current_callback ( | |
| 77 intptr_t callback, intptr_t *addr, intptr_t compare_value, Mutex *sync) { | |
| 78 if (VM_Version::supports_compare_and_exchange()) { | |
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79 return Atomic::cmpxchg_ptr(callback, addr, compare_value); |
| 0 | 80 } else { |
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81 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); |
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82 if (*addr == compare_value) { |
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83 *addr = callback; |
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84 return compare_value; |
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85 } else { |
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86 return callback; |
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87 } |
| 0 | 88 } |
| 89 } | |
| 90 | |
| 91 // used in signal handler | |
| 92 static intptr_t exchange_current_callback(intptr_t callback, intptr_t *addr, Mutex *sync) { | |
| 93 if (VM_Version::supports_compare_and_exchange()) { | |
| 94 return Atomic::xchg_ptr(callback, addr); | |
| 95 } else { | |
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96 MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag); |
| 0 | 97 intptr_t cb = *addr; |
| 98 *addr = callback; | |
| 99 return cb; | |
| 100 } | |
| 101 } | |
| 102 | |
| 103 // one interrupt at a time. spin if _current_callback != NULL | |
| 104 int OSThread::set_interrupt_callback(Sync_Interrupt_Callback * cb) { | |
| 105 int count = 0; | |
| 106 while (compare_and_exchange_current_callback( | |
| 107 (intptr_t)cb, (intptr_t *)&_current_callback, (intptr_t)NULL, _current_callback_lock) != NULL) { | |
| 108 while (_current_callback != NULL) { | |
| 109 count++; | |
| 110 #ifdef ASSERT | |
| 111 if ((WarnOnStalledSpinLock > 0) && | |
| 112 (count % WarnOnStalledSpinLock == 0)) { | |
| 113 warning("_current_callback seems to be stalled: %p", _current_callback); | |
| 114 } | |
| 115 #endif | |
| 116 os::yield_all(count); | |
| 117 } | |
| 118 } | |
| 119 return 0; | |
| 120 } | |
| 121 | |
| 122 // reset _current_callback, spin if _current_callback is callback_in_progress | |
| 123 void OSThread::remove_interrupt_callback(Sync_Interrupt_Callback * cb) { | |
| 124 int count = 0; | |
| 125 while (compare_and_exchange_current_callback( | |
| 126 (intptr_t)NULL, (intptr_t *)&_current_callback, (intptr_t)cb, _current_callback_lock) != (intptr_t)cb) { | |
| 127 #ifdef ASSERT | |
| 128 intptr_t p = (intptr_t)_current_callback; | |
| 129 assert(p == (intptr_t)callback_in_progress || | |
| 130 p == (intptr_t)cb, "wrong _current_callback value"); | |
| 131 #endif | |
| 132 while (_current_callback != cb) { | |
| 133 count++; | |
| 134 #ifdef ASSERT | |
| 135 if ((WarnOnStalledSpinLock > 0) && | |
| 136 (count % WarnOnStalledSpinLock == 0)) { | |
| 137 warning("_current_callback seems to be stalled: %p", _current_callback); | |
| 138 } | |
| 139 #endif | |
| 140 os::yield_all(count); | |
| 141 } | |
| 142 } | |
| 143 } | |
| 144 | |
| 145 void OSThread::do_interrupt_callbacks_at_interrupt(InterruptArguments *args) { | |
| 146 Sync_Interrupt_Callback * cb; | |
| 147 cb = (Sync_Interrupt_Callback *)exchange_current_callback( | |
| 148 (intptr_t)callback_in_progress, (intptr_t *)&_current_callback, _current_callback_lock); | |
| 149 | |
| 150 if (cb == NULL) { | |
| 151 // signal is delivered too late (thread is masking interrupt signal??). | |
| 152 // there is nothing we need to do because requesting thread has given up. | |
| 153 } else if ((intptr_t)cb == (intptr_t)callback_in_progress) { | |
| 154 fatal("invalid _current_callback state"); | |
| 155 } else { | |
| 156 assert(cb->target()->osthread() == this, "wrong target"); | |
| 157 cb->execute(args); | |
| 158 cb->leave_callback(); // notify the requester | |
| 159 } | |
| 160 | |
| 161 // restore original _current_callback value | |
| 162 intptr_t p; | |
| 163 p = exchange_current_callback((intptr_t)cb, (intptr_t *)&_current_callback, _current_callback_lock); | |
| 164 assert(p == (intptr_t)callback_in_progress, "just checking"); | |
| 165 } | |
| 166 | |
| 167 // Called by the requesting thread to send a signal to target thread and | |
| 168 // execute "this" callback from the signal handler. | |
| 169 int OSThread::Sync_Interrupt_Callback::interrupt(Thread * target, int timeout) { | |
| 170 // Let signals to the vm_thread go even if the Threads_lock is not acquired | |
| 171 assert(Threads_lock->owned_by_self() || (target == VMThread::vm_thread()), | |
| 172 "must have threads lock to call this"); | |
| 173 | |
| 174 OSThread * osthread = target->osthread(); | |
| 175 | |
| 176 // may block if target thread already has a pending callback | |
| 177 osthread->set_interrupt_callback(this); | |
| 178 | |
| 179 _target = target; | |
| 180 | |
| 181 int rslt = thr_kill(osthread->thread_id(), os::Solaris::SIGasync()); | |
| 182 assert(rslt == 0, "thr_kill != 0"); | |
| 183 | |
| 184 bool status = false; | |
| 185 jlong t1 = os::javaTimeMillis(); | |
| 186 { // don't use safepoint check because we might be the watcher thread. | |
| 187 MutexLockerEx ml(_sync, Mutex::_no_safepoint_check_flag); | |
| 188 while (!is_done()) { | |
| 189 status = _sync->wait(Mutex::_no_safepoint_check_flag, timeout); | |
| 190 | |
| 191 // status == true if timed out | |
| 192 if (status) break; | |
| 193 | |
| 194 // update timeout | |
| 195 jlong t2 = os::javaTimeMillis(); | |
| 196 timeout -= t2 - t1; | |
| 197 t1 = t2; | |
| 198 } | |
| 199 } | |
| 200 | |
| 201 // reset current_callback | |
| 202 osthread->remove_interrupt_callback(this); | |
| 203 | |
| 204 return status; | |
| 205 } | |
| 206 | |
| 207 void OSThread::Sync_Interrupt_Callback::leave_callback() { | |
| 208 if (!_sync->owned_by_self()) { | |
| 209 // notify requesting thread | |
| 210 MutexLockerEx ml(_sync, Mutex::_no_safepoint_check_flag); | |
| 211 _is_done = true; | |
| 212 _sync->notify_all(); | |
| 213 } else { | |
| 214 // Current thread is interrupted while it is holding the _sync lock, trying | |
| 215 // to grab it again will deadlock. The requester will timeout anyway, | |
| 216 // so just return. | |
| 217 _is_done = true; | |
| 218 } | |
| 219 } | |
| 220 | |
| 221 // copied from synchronizer.cpp | |
| 222 | |
| 223 void OSThread::handle_spinlock_contention(int tries) { | |
| 224 if (NoYieldsInMicrolock) return; | |
| 225 | |
| 226 if (tries > 10) { | |
| 227 os::yield_all(tries); // Yield to threads of any priority | |
| 228 } else if (tries > 5) { | |
| 229 os::yield(); // Yield to threads of same or higher priority | |
| 230 } | |
| 231 } |