| // Copyright 2015 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "config.h" |
| #include "modules/compositorworker/CompositorWorkerManager.h" |
| |
| #include "bindings/core/v8/V8Binding.h" |
| #include "bindings/core/v8/V8GCController.h" |
| #include "bindings/core/v8/V8Initializer.h" |
| #include "bindings/core/v8/V8PerIsolateData.h" |
| #include "platform/ThreadSafeFunctional.h" |
| #include "platform/WebThreadSupportingGC.h" |
| #include "wtf/MainThread.h" |
| #include "wtf/ThreadingPrimitives.h" |
| |
| namespace blink { |
| |
| namespace { |
| |
| static CompositorWorkerManager* s_instance = nullptr; |
| |
| Mutex& singletonMutex() |
| { |
| AtomicallyInitializedStaticReference(Mutex, mutex, new Mutex); |
| return mutex; |
| } |
| |
| void destroyThread(WebThread* thread) |
| { |
| delete thread; |
| } |
| |
| } // namespace |
| |
| void CompositorWorkerManager::initialize() |
| { |
| MutexLocker lock(singletonMutex()); |
| ASSERT(!s_instance); |
| s_instance = new CompositorWorkerManager(); |
| } |
| |
| void CompositorWorkerManager::shutdown() |
| { |
| MutexLocker lock(singletonMutex()); |
| ASSERT(s_instance); |
| delete s_instance; |
| s_instance = nullptr; |
| } |
| |
| CompositorWorkerManager* CompositorWorkerManager::instance() |
| { |
| MutexLocker lock(singletonMutex()); |
| ASSERT(s_instance); |
| return s_instance; |
| } |
| |
| CompositorWorkerManager::CompositorWorkerManager() |
| { |
| } |
| |
| CompositorWorkerManager::~CompositorWorkerManager() |
| { |
| } |
| |
| WebThreadSupportingGC& CompositorWorkerManager::compositorWorkerThread() |
| { |
| MutexLocker lock(m_mutex); |
| if (!m_thread) { |
| ASSERT(isMainThread()); |
| ASSERT(!m_workerCount); |
| // TODO(sadrul): Instead of creating a new thread, retrieve the thread from |
| // Platform using a more specialized function |
| // (e.g. Platform::compositorWorkerThread()). |
| m_platformThread = adoptPtr(Platform::current()->createThread("CompositorWorker Thread")); |
| m_thread = WebThreadSupportingGC::createForThread(m_platformThread.get()); |
| } |
| return *m_thread.get(); |
| } |
| |
| void CompositorWorkerManager::initializeBackingThread() |
| { |
| ASSERT(m_thread->isCurrentThread()); |
| MutexLocker lock(m_mutex); |
| ++m_workerCount; |
| if (m_workerCount > 1) |
| return; |
| |
| m_thread->initialize(); |
| |
| // Initialize the isolate at the same time. |
| ASSERT(!m_isolate); |
| m_isolate = V8PerIsolateData::initialize(); |
| V8Initializer::initializeWorker(m_isolate); |
| |
| OwnPtr<V8IsolateInterruptor> interruptor = adoptPtr(new V8IsolateInterruptor(m_isolate)); |
| ThreadState::current()->addInterruptor(interruptor.release()); |
| ThreadState::current()->registerTraceDOMWrappers(m_isolate, V8GCController::traceDOMWrappers); |
| } |
| |
| void CompositorWorkerManager::shutdownBackingThread() |
| { |
| MutexLocker lock(m_mutex); |
| ASSERT(m_thread->isCurrentThread()); |
| ASSERT(m_workerCount > 0); |
| --m_workerCount; |
| if (m_workerCount == 0) { |
| m_thread->shutdown(); |
| m_thread = nullptr; |
| Platform::current()->mainThread()->taskRunner()->postTask(BLINK_FROM_HERE, threadSafeBind(destroyThread, AllowCrossThreadAccess(m_platformThread.leakPtr()))); |
| } |
| } |
| |
| v8::Isolate* CompositorWorkerManager::initializeIsolate() |
| { |
| MutexLocker lock(m_mutex); |
| ASSERT(m_thread->isCurrentThread()); |
| ASSERT(m_isolate); |
| // It is safe to use the existing isolate even if TerminateExecution() has been |
| // called on it, without calling CancelTerminateExecution(). |
| return m_isolate; |
| } |
| |
| void CompositorWorkerManager::willDestroyIsolate() |
| { |
| MutexLocker lock(m_mutex); |
| ASSERT(m_thread->isCurrentThread()); |
| if (m_workerCount == 1) |
| V8PerIsolateData::willBeDestroyed(m_isolate); |
| } |
| |
| void CompositorWorkerManager::destroyIsolate() |
| { |
| MutexLocker lock(m_mutex); |
| if (!m_thread) { |
| ASSERT(m_workerCount == 0); |
| V8PerIsolateData::destroy(m_isolate); |
| m_isolate = nullptr; |
| } |
| } |
| |
| void CompositorWorkerManager::terminateV8Execution() |
| { |
| MutexLocker lock(m_mutex); |
| ASSERT(isMainThread()); |
| if (m_workerCount > 1) |
| return; |
| |
| v8::V8::TerminateExecution(m_isolate); |
| } |
| |
| } // namespace blink |