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| 1 /* | |
| 2 * Copyright (C) 2014 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 #ifndef MessageLoopInterruptor_h | |
| 32 #define MessageLoopInterruptor_h | |
| 33 | |
| 34 #include "platform/heap/ThreadState.h" | |
| 35 #include "public/platform/WebThread.h" | |
| 36 | |
| 37 namespace blink { | |
| 38 | |
| 39 class MessageLoopInterruptor : public ThreadState::Interruptor { | |
| 40 public: | |
| 41 explicit MessageLoopInterruptor(blink::WebThread* thread) : m_thread(thread)
{ } | |
| 42 | |
| 43 virtual void requestInterrupt() OVERRIDE | |
| 44 { | |
| 45 // GCTask has an empty run() method. Its only purpose is to guarantee | |
| 46 // that MessageLoop will have a task to process which will result | |
| 47 // in PendingGCRunner::didProcessTask being executed. | |
| 48 m_thread->postTask(new GCTask); | |
| 49 } | |
| 50 | |
| 51 virtual void clearInterrupt() OVERRIDE { } | |
| 52 | |
| 53 private: | |
| 54 class GCTask : public blink::WebThread::Task { | |
| 55 public: | |
| 56 virtual ~GCTask() { } | |
| 57 | |
| 58 virtual void run() OVERRIDE | |
| 59 { | |
| 60 // Don't do anything here because we don't know if this is | |
| 61 // a nested event loop or not. PendingGCRunner::didProcessTask | |
| 62 // will enter correct safepoint for us. | |
| 63 // We are not calling onInterrupted() because that always | |
| 64 // conservatively enters safepoint with pointers on stack. | |
| 65 } | |
| 66 }; | |
| 67 | |
| 68 blink::WebThread* m_thread; | |
| 69 }; | |
| 70 | |
| 71 } | |
| 72 | |
| 73 #endif | |
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