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1 // Copyright 2015 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #include "config.h" | |
6 #include "modules/compositorworker/CompositorWorkerManager.h" | |
7 | |
8 #include "bindings/core/v8/V8Binding.h" | |
9 #include "bindings/core/v8/V8GCController.h" | |
10 #include "bindings/core/v8/V8Initializer.h" | |
11 #include "bindings/core/v8/V8PerIsolateData.h" | |
12 #include "platform/ThreadSafeFunctional.h" | |
13 #include "platform/WebThreadSupportingGC.h" | |
14 #include "wtf/MainThread.h" | |
15 #include "wtf/ThreadingPrimitives.h" | |
16 | |
17 namespace blink { | |
18 | |
19 namespace { | |
20 | |
21 static CompositorWorkerManager* s_instance = nullptr; | |
22 | |
23 Mutex& singletonMutex() | |
24 { | |
25 AtomicallyInitializedStaticReference(Mutex, mutex, new Mutex); | |
26 return mutex; | |
27 } | |
28 | |
29 void destroyThread(WebThread* thread) | |
30 { | |
31 delete thread; | |
32 } | |
33 | |
34 } // namespace | |
35 | |
36 void CompositorWorkerManager::initialize() | |
37 { | |
38 MutexLocker lock(singletonMutex()); | |
39 ASSERT(!s_instance); | |
40 s_instance = new CompositorWorkerManager(); | |
41 } | |
42 | |
43 void CompositorWorkerManager::shutdown() | |
44 { | |
45 MutexLocker lock(singletonMutex()); | |
46 ASSERT(s_instance); | |
47 delete s_instance; | |
48 s_instance = nullptr; | |
49 } | |
50 | |
51 CompositorWorkerManager* CompositorWorkerManager::instance() | |
52 { | |
53 MutexLocker lock(singletonMutex()); | |
54 ASSERT(s_instance); | |
55 return s_instance; | |
56 } | |
57 | |
58 CompositorWorkerManager::CompositorWorkerManager() | |
59 { | |
60 } | |
61 | |
62 CompositorWorkerManager::~CompositorWorkerManager() | |
63 { | |
64 } | |
65 | |
66 WebThreadSupportingGC& CompositorWorkerManager::compositorWorkerThread() | |
67 { | |
68 MutexLocker lock(m_mutex); | |
69 if (!m_thread) { | |
70 ASSERT(isMainThread()); | |
71 ASSERT(!m_workerCount); | |
72 // TODO(sadrul): Instead of creating a new thread, retrieve the thread f
rom | |
73 // Platform using a more specialized function | |
74 // (e.g. Platform::compositorWorkerThread()). | |
75 m_platformThread = adoptPtr(Platform::current()->createThread("Composito
rWorker Thread")); | |
76 m_thread = WebThreadSupportingGC::createForThread(m_platformThread.get()
); | |
77 } | |
78 return *m_thread.get(); | |
79 } | |
80 | |
81 void CompositorWorkerManager::initializeBackingThread() | |
82 { | |
83 ASSERT(m_thread->isCurrentThread()); | |
84 MutexLocker lock(m_mutex); | |
85 ++m_workerCount; | |
86 if (m_workerCount > 1) | |
87 return; | |
88 | |
89 m_thread->initialize(); | |
90 | |
91 // Initialize the isolate at the same time. | |
92 ASSERT(!m_isolate); | |
93 m_isolate = V8PerIsolateData::initialize(); | |
94 V8Initializer::initializeWorker(m_isolate); | |
95 | |
96 OwnPtr<V8IsolateInterruptor> interruptor = adoptPtr(new V8IsolateInterruptor
(m_isolate)); | |
97 ThreadState::current()->addInterruptor(interruptor.release()); | |
98 ThreadState::current()->registerTraceDOMWrappers(m_isolate, V8GCController::
traceDOMWrappers); | |
99 } | |
100 | |
101 void CompositorWorkerManager::shutdownBackingThread() | |
102 { | |
103 MutexLocker lock(m_mutex); | |
104 ASSERT(m_thread->isCurrentThread()); | |
105 ASSERT(m_workerCount > 0); | |
106 --m_workerCount; | |
107 if (m_workerCount == 0) { | |
108 m_thread->shutdown(); | |
109 m_thread = nullptr; | |
110 Platform::current()->mainThread()->taskRunner()->postTask(BLINK_FROM_HER
E, threadSafeBind(destroyThread, AllowCrossThreadAccess(m_platformThread.leakPtr
()))); | |
111 } | |
112 } | |
113 | |
114 v8::Isolate* CompositorWorkerManager::initializeIsolate() | |
115 { | |
116 MutexLocker lock(m_mutex); | |
117 ASSERT(m_thread->isCurrentThread()); | |
118 ASSERT(m_isolate); | |
119 // It is safe to use the existing isolate even if TerminateExecution() has b
een | |
120 // called on it, without calling CancelTerminateExecution(). | |
121 return m_isolate; | |
122 } | |
123 | |
124 void CompositorWorkerManager::willDestroyIsolate() | |
125 { | |
126 MutexLocker lock(m_mutex); | |
127 ASSERT(m_thread->isCurrentThread()); | |
128 if (m_workerCount == 1) | |
129 V8PerIsolateData::willBeDestroyed(m_isolate); | |
130 } | |
131 | |
132 void CompositorWorkerManager::destroyIsolate() | |
133 { | |
134 MutexLocker lock(m_mutex); | |
135 if (!m_thread) { | |
136 ASSERT(m_workerCount == 0); | |
137 V8PerIsolateData::destroy(m_isolate); | |
138 m_isolate = nullptr; | |
139 } | |
140 } | |
141 | |
142 void CompositorWorkerManager::terminateV8Execution() | |
143 { | |
144 MutexLocker lock(m_mutex); | |
145 ASSERT(isMainThread()); | |
146 if (m_workerCount > 1) | |
147 return; | |
148 | |
149 v8::V8::TerminateExecution(m_isolate); | |
150 } | |
151 | |
152 } // namespace blink | |
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