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| 1 /* | |
| 2 * Copyright (C) 2009 Google Inc. All rights reserved. | |
| 3 * | |
| 4 * Redistribution and use in source and binary forms, with or without | |
| 5 * modification, are permitted provided that the following conditions are | |
| 6 * met: | |
| 7 * | |
| 8 * * Redistributions of source code must retain the above copyright | |
| 9 * notice, this list of conditions and the following disclaimer. | |
| 10 * * Redistributions in binary form must reproduce the above | |
| 11 * copyright notice, this list of conditions and the following disclaimer | |
| 12 * in the documentation and/or other materials provided with the | |
| 13 * distribution. | |
| 14 * * Neither the name of Google Inc. nor the names of its | |
| 15 * contributors may be used to endorse or promote products derived from | |
| 16 * this software without specific prior written permission. | |
| 17 * | |
| 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
| 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
| 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
| 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
| 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
| 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
| 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
| 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
| 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 29 */ | |
| 30 | |
| 31 #include "config.h" | |
| 32 #include "core/workers/WorkerRunLoop.h" | |
| 33 | |
| 34 #include "core/inspector/InspectorInstrumentation.h" | |
| 35 #include "core/workers/WorkerGlobalScope.h" | |
| 36 #include "core/workers/WorkerThread.h" | |
| 37 #include "platform/PlatformThreadData.h" | |
| 38 #include "platform/SharedTimer.h" | |
| 39 #include "platform/ThreadTimers.h" | |
| 40 #include "platform/heap/ThreadState.h" | |
| 41 #include "wtf/CurrentTime.h" | |
| 42 | |
| 43 namespace blink { | |
| 44 | |
| 45 class WorkerRunLoopTask : public blink::WebThread::Task { | |
| 46 WTF_MAKE_NONCOPYABLE(WorkerRunLoopTask); WTF_MAKE_FAST_ALLOCATED; | |
| 47 public: | |
| 48 static PassOwnPtr<WorkerRunLoopTask> create(const WorkerRunLoop& runLoop, Pa
ssOwnPtr<ExecutionContextTask> task, bool isInstrumented) | |
| 49 { | |
| 50 return adoptPtr(new WorkerRunLoopTask(runLoop, task, isInstrumented)); | |
| 51 } | |
| 52 | |
| 53 virtual ~WorkerRunLoopTask() { } | |
| 54 | |
| 55 virtual void run() OVERRIDE | |
| 56 { | |
| 57 WorkerGlobalScope* workerGlobalScope = m_runLoop.context(); | |
| 58 if (m_isInstrumented) | |
| 59 InspectorInstrumentation::willPerformExecutionContextTask(workerGlob
alScope, m_task.get()); | |
| 60 if ((!workerGlobalScope->isClosing() && !m_runLoop.terminated()) || m_ta
sk->isCleanupTask()) | |
| 61 m_task->performTask(workerGlobalScope); | |
| 62 if (m_isInstrumented) | |
| 63 InspectorInstrumentation::didPerformExecutionContextTask(workerGloba
lScope); | |
| 64 } | |
| 65 | |
| 66 private: | |
| 67 WorkerRunLoopTask(const WorkerRunLoop& runLoop, PassOwnPtr<ExecutionContextT
ask> task, bool isInstrumented) | |
| 68 : m_runLoop(runLoop) | |
| 69 , m_task(task) | |
| 70 , m_isInstrumented(isInstrumented) | |
| 71 { | |
| 72 if (m_isInstrumented) | |
| 73 m_isInstrumented = !m_task->taskNameForInstrumentation().isEmpty(); | |
| 74 if (m_isInstrumented) | |
| 75 InspectorInstrumentation::didPostExecutionContextTask(m_runLoop.cont
ext(), m_task.get()); | |
| 76 } | |
| 77 | |
| 78 const WorkerRunLoop& m_runLoop; | |
| 79 OwnPtr<ExecutionContextTask> m_task; | |
| 80 bool m_isInstrumented; | |
| 81 }; | |
| 82 | |
| 83 class TickleDebuggerQueueTask FINAL : public ExecutionContextTask { | |
| 84 public: | |
| 85 static PassOwnPtr<TickleDebuggerQueueTask> create(WorkerRunLoop* loop) | |
| 86 { | |
| 87 return adoptPtr(new TickleDebuggerQueueTask(loop)); | |
| 88 } | |
| 89 virtual void performTask(ExecutionContext* context) OVERRIDE | |
| 90 { | |
| 91 ASSERT(context->isWorkerGlobalScope()); | |
| 92 m_loop->runDebuggerTask(WorkerRunLoop::DontWaitForMessage); | |
| 93 } | |
| 94 | |
| 95 private: | |
| 96 explicit TickleDebuggerQueueTask(WorkerRunLoop* loop) : m_loop(loop) { } | |
| 97 | |
| 98 WorkerRunLoop* m_loop; | |
| 99 }; | |
| 100 | |
| 101 class WorkerSharedTimer : public SharedTimer { | |
| 102 public: | |
| 103 WorkerSharedTimer() | |
| 104 : m_sharedTimerFunction(0) | |
| 105 , m_nextFireTime(0) | |
| 106 { | |
| 107 } | |
| 108 | |
| 109 // SharedTimer interface. | |
| 110 virtual void setFiredFunction(void (*function)()) { m_sharedTimerFunction =
function; } | |
| 111 virtual void setFireInterval(double interval) { m_nextFireTime = interval +
currentTime(); } | |
| 112 virtual void stop() { m_nextFireTime = 0; } | |
| 113 | |
| 114 bool isActive() { return m_sharedTimerFunction && m_nextFireTime; } | |
| 115 double fireTime() { return m_nextFireTime; } | |
| 116 void fire() { m_sharedTimerFunction(); } | |
| 117 | |
| 118 private: | |
| 119 void (*m_sharedTimerFunction)(); | |
| 120 double m_nextFireTime; | |
| 121 }; | |
| 122 | |
| 123 WorkerRunLoop::WorkerRunLoop() | |
| 124 : m_sharedTimer(adoptPtr(new WorkerSharedTimer)) | |
| 125 , m_context(0) | |
| 126 , m_nestedCount(0) | |
| 127 { | |
| 128 } | |
| 129 | |
| 130 WorkerRunLoop::~WorkerRunLoop() | |
| 131 { | |
| 132 ASSERT(!m_nestedCount); | |
| 133 } | |
| 134 | |
| 135 class RunLoopSetup { | |
| 136 WTF_MAKE_NONCOPYABLE(RunLoopSetup); | |
| 137 public: | |
| 138 RunLoopSetup(WorkerRunLoop& runLoop, WorkerGlobalScope* context) | |
| 139 : m_runLoop(runLoop) | |
| 140 , m_context(context) | |
| 141 { | |
| 142 if (!m_runLoop.m_nestedCount) | |
| 143 PlatformThreadData::current().threadTimers().setSharedTimer(m_runLoo
p.m_sharedTimer.get()); | |
| 144 m_runLoop.m_nestedCount++; | |
| 145 InspectorInstrumentation::willEnterNestedRunLoop(m_context); | |
| 146 } | |
| 147 | |
| 148 ~RunLoopSetup() | |
| 149 { | |
| 150 m_runLoop.m_nestedCount--; | |
| 151 if (!m_runLoop.m_nestedCount) | |
| 152 PlatformThreadData::current().threadTimers().setSharedTimer(0); | |
| 153 InspectorInstrumentation::didLeaveNestedRunLoop(m_context); | |
| 154 } | |
| 155 private: | |
| 156 WorkerRunLoop& m_runLoop; | |
| 157 WorkerGlobalScope* m_context; | |
| 158 }; | |
| 159 | |
| 160 void WorkerRunLoop::setWorkerGlobalScope(WorkerGlobalScope* context) | |
| 161 { | |
| 162 ASSERT(!m_context); | |
| 163 ASSERT(context); | |
| 164 m_context = context; | |
| 165 } | |
| 166 | |
| 167 void WorkerRunLoop::run() | |
| 168 { | |
| 169 ASSERT(m_context); | |
| 170 RunLoopSetup setup(*this, m_context); | |
| 171 MessageQueueWaitResult result; | |
| 172 do { | |
| 173 ThreadState::current()->safePoint(ThreadState::NoHeapPointersOnStack); | |
| 174 result = run(m_messageQueue, WaitForMessage); | |
| 175 } while (result != MessageQueueTerminated); | |
| 176 runCleanupTasks(); | |
| 177 } | |
| 178 | |
| 179 MessageQueueWaitResult WorkerRunLoop::runDebuggerTask(WaitMode waitMode) | |
| 180 { | |
| 181 ASSERT(m_context); | |
| 182 RunLoopSetup setup(*this, m_context); | |
| 183 return run(m_debuggerMessageQueue, waitMode); | |
| 184 } | |
| 185 | |
| 186 MessageQueueWaitResult WorkerRunLoop::run(MessageQueue<blink::WebThread::Task>&
queue, WaitMode waitMode) | |
| 187 { | |
| 188 ASSERT(m_context); | |
| 189 ASSERT(m_context->thread()); | |
| 190 ASSERT(m_context->thread()->isCurrentThread()); | |
| 191 | |
| 192 bool isDebuggerQueue = (&queue == &m_debuggerMessageQueue); | |
| 193 bool nextTimeoutEventIsIdleWatchdog; | |
| 194 MessageQueueWaitResult result; | |
| 195 OwnPtr<blink::WebThread::Task> task; | |
| 196 do { | |
| 197 double absoluteTime = 0.0; | |
| 198 nextTimeoutEventIsIdleWatchdog = false; | |
| 199 if (waitMode == WaitForMessage) { | |
| 200 absoluteTime = !isDebuggerQueue && m_sharedTimer->isActive() ? m_sha
redTimer->fireTime() : MessageQueue<blink::WebThread::Task>::infiniteTime(); | |
| 201 | |
| 202 // Do a script engine idle notification if the next event is distant
enough. | |
| 203 const double kMinIdleTimespan = 0.3; // seconds | |
| 204 if (queue.isEmpty() && absoluteTime > currentTime() + kMinIdleTimesp
an) { | |
| 205 bool hasMoreWork = !m_context->idleNotification(); | |
| 206 if (hasMoreWork) { | |
| 207 // Schedule a watchdog, so if there are no events within a p
articular time interval | |
| 208 // idle notifications won't stop firing. | |
| 209 const double kWatchdogInterval = 3; // seconds | |
| 210 double nextWatchdogTime = currentTime() + kWatchdogInterval; | |
| 211 if (absoluteTime > nextWatchdogTime) { | |
| 212 absoluteTime = nextWatchdogTime; | |
| 213 nextTimeoutEventIsIdleWatchdog = true; | |
| 214 } | |
| 215 } | |
| 216 } | |
| 217 } | |
| 218 | |
| 219 { | |
| 220 ThreadState::SafePointScope safePointScope(ThreadState::NoHeapPointe
rsOnStack); | |
| 221 task = queue.waitForMessageWithTimeout(result, absoluteTime); | |
| 222 } | |
| 223 } while (result == MessageQueueTimeout && nextTimeoutEventIsIdleWatchdog); | |
| 224 | |
| 225 // If the context is closing, don't execute any further JavaScript tasks (pe
r section 4.1.1 of the Web Workers spec). | |
| 226 // However, there may be implementation cleanup tasks in the queue, so keep
running through it. | |
| 227 | |
| 228 switch (result) { | |
| 229 case MessageQueueTerminated: | |
| 230 break; | |
| 231 | |
| 232 case MessageQueueMessageReceived: | |
| 233 InspectorInstrumentation::willProcessTask(m_context); | |
| 234 task->run(); | |
| 235 InspectorInstrumentation::didProcessTask(m_context); | |
| 236 break; | |
| 237 | |
| 238 case MessageQueueTimeout: | |
| 239 ASSERT(!isDebuggerQueue || waitMode != WaitForMessage); | |
| 240 if (!m_context->isClosing()) | |
| 241 m_sharedTimer->fire(); | |
| 242 break; | |
| 243 } | |
| 244 | |
| 245 return result; | |
| 246 } | |
| 247 | |
| 248 void WorkerRunLoop::runCleanupTasks() | |
| 249 { | |
| 250 ASSERT(m_context); | |
| 251 ASSERT(m_context->thread()); | |
| 252 ASSERT(m_context->thread()->isCurrentThread()); | |
| 253 ASSERT(m_messageQueue.killed()); | |
| 254 ASSERT(m_debuggerMessageQueue.killed()); | |
| 255 | |
| 256 while (true) { | |
| 257 OwnPtr<blink::WebThread::Task> task = m_debuggerMessageQueue.tryGetMessa
geIgnoringKilled(); | |
| 258 if (!task) | |
| 259 task = m_messageQueue.tryGetMessageIgnoringKilled(); | |
| 260 if (!task) | |
| 261 return; | |
| 262 task->run(); | |
| 263 } | |
| 264 } | |
| 265 | |
| 266 void WorkerRunLoop::terminate() | |
| 267 { | |
| 268 InspectorInstrumentation::didKillAllExecutionContextTasks(m_context); | |
| 269 m_messageQueue.kill(); | |
| 270 m_debuggerMessageQueue.kill(); | |
| 271 } | |
| 272 | |
| 273 bool WorkerRunLoop::postTask(PassOwnPtr<ExecutionContextTask> task) | |
| 274 { | |
| 275 return m_messageQueue.append(WorkerRunLoopTask::create(*this, task, true)); | |
| 276 } | |
| 277 | |
| 278 void WorkerRunLoop::postTaskAndTerminate(PassOwnPtr<ExecutionContextTask> task) | |
| 279 { | |
| 280 InspectorInstrumentation::didKillAllExecutionContextTasks(m_context); | |
| 281 m_debuggerMessageQueue.kill(); | |
| 282 m_messageQueue.appendAndKill(WorkerRunLoopTask::create(*this, task, false)); | |
| 283 } | |
| 284 | |
| 285 bool WorkerRunLoop::postDebuggerTask(PassOwnPtr<ExecutionContextTask> task) | |
| 286 { | |
| 287 bool posted = m_debuggerMessageQueue.append(WorkerRunLoopTask::create(*this,
task, false)); | |
| 288 if (posted) | |
| 289 postTask(TickleDebuggerQueueTask::create(this)); | |
| 290 return posted; | |
| 291 } | |
| 292 | |
| 293 } // namespace blink | |
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Chromium Code Reviews
Issue 423303004:
Change WokerThread to use a blink::WebThread (Closed)
Base URL: svn://svn.chromium.org/blink/trunk