OLD | NEW |
1 /* | 1 /* |
2 * Copyright (C) 2014 Google Inc. All rights reserved. | 2 * Copyright (C) 2014 Google Inc. All rights reserved. |
3 * | 3 * |
4 * Redistribution and use in source and binary forms, with or without | 4 * Redistribution and use in source and binary forms, with or without |
5 * modification, are permitted provided that the following conditions are | 5 * modification, are permitted provided that the following conditions are |
6 * met: | 6 * met: |
7 * | 7 * |
8 * * Redistributions of source code must retain the above copyright | 8 * * Redistributions of source code must retain the above copyright |
9 * notice, this list of conditions and the following disclaimer. | 9 * notice, this list of conditions and the following disclaimer. |
10 * * Redistributions in binary form must reproduce the above | 10 * * Redistributions in binary form must reproduce the above |
(...skipping 23 matching lines...) Expand all Loading... |
34 #include "platform/CrossThreadFunctional.h" | 34 #include "platform/CrossThreadFunctional.h" |
35 #include "platform/WebTaskRunner.h" | 35 #include "platform/WebTaskRunner.h" |
36 #include "platform/heap/ThreadState.h" | 36 #include "platform/heap/ThreadState.h" |
37 #include "public/platform/WebThread.h" | 37 #include "public/platform/WebThread.h" |
38 #include "public/platform/WebTraceLocation.h" | 38 #include "public/platform/WebTraceLocation.h" |
39 #include "wtf/PtrUtil.h" | 39 #include "wtf/PtrUtil.h" |
40 #include <memory> | 40 #include <memory> |
41 | 41 |
42 namespace blink { | 42 namespace blink { |
43 | 43 |
44 class MessageLoopInterruptor final : public BlinkGCInterruptor { | |
45 public: | |
46 explicit MessageLoopInterruptor(RefPtr<WebTaskRunner> taskRunner) | |
47 : m_taskRunner(std::move(taskRunner)) {} | |
48 | |
49 void requestInterrupt() override { | |
50 // GCTask has an empty run() method. Its only purpose is to guarantee | |
51 // that MessageLoop will have a task to process which will result | |
52 // in GCTaskRunner::didProcessTask being executed. | |
53 m_taskRunner->postTask(BLINK_FROM_HERE, crossThreadBind(&runGCTask)); | |
54 } | |
55 | |
56 private: | |
57 static void runGCTask() { | |
58 // Don't do anything here because we don't know if this is | |
59 // a nested event loop or not. GCTaskRunner::didProcessTask | |
60 // will enter correct safepoint for us. | |
61 // We are not calling onInterrupted() because that always | |
62 // conservatively enters safepoint with pointers on stack. | |
63 } | |
64 | |
65 RefPtr<WebTaskRunner> m_taskRunner; | |
66 }; | |
67 | |
68 class GCTaskObserver final : public WebThread::TaskObserver { | 44 class GCTaskObserver final : public WebThread::TaskObserver { |
69 USING_FAST_MALLOC(GCTaskObserver); | 45 USING_FAST_MALLOC(GCTaskObserver); |
70 | 46 |
71 public: | 47 public: |
72 GCTaskObserver() : m_nesting(0) {} | 48 GCTaskObserver() : m_nesting(0) {} |
73 | 49 |
74 ~GCTaskObserver() { | 50 ~GCTaskObserver() { |
75 // m_nesting can be 1 if this was unregistered in a task and | 51 // m_nesting can be 1 if this was unregistered in a task and |
76 // didProcessTask was not called. | 52 // didProcessTask was not called. |
77 ASSERT(!m_nesting || m_nesting == 1); | 53 ASSERT(!m_nesting || m_nesting == 1); |
(...skipping 18 matching lines...) Expand all Loading... |
96 }; | 72 }; |
97 | 73 |
98 class GCTaskRunner final { | 74 class GCTaskRunner final { |
99 USING_FAST_MALLOC(GCTaskRunner); | 75 USING_FAST_MALLOC(GCTaskRunner); |
100 | 76 |
101 public: | 77 public: |
102 explicit GCTaskRunner(WebThread* thread) | 78 explicit GCTaskRunner(WebThread* thread) |
103 : m_gcTaskObserver(WTF::wrapUnique(new GCTaskObserver)), | 79 : m_gcTaskObserver(WTF::wrapUnique(new GCTaskObserver)), |
104 m_thread(thread) { | 80 m_thread(thread) { |
105 m_thread->addTaskObserver(m_gcTaskObserver.get()); | 81 m_thread->addTaskObserver(m_gcTaskObserver.get()); |
106 ThreadState::current()->addInterruptor(WTF::wrapUnique( | |
107 new MessageLoopInterruptor(thread->getWebTaskRunner()))); | |
108 } | 82 } |
109 | 83 |
110 ~GCTaskRunner() { m_thread->removeTaskObserver(m_gcTaskObserver.get()); } | 84 ~GCTaskRunner() { m_thread->removeTaskObserver(m_gcTaskObserver.get()); } |
111 | 85 |
112 private: | 86 private: |
113 std::unique_ptr<GCTaskObserver> m_gcTaskObserver; | 87 std::unique_ptr<GCTaskObserver> m_gcTaskObserver; |
114 WebThread* m_thread; | 88 WebThread* m_thread; |
115 }; | 89 }; |
116 | 90 |
117 } // namespace blink | 91 } // namespace blink |
118 | 92 |
119 #endif | 93 #endif |
OLD | NEW |