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| 1 // Copyright 2016 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 #ifndef WorkerBackingThread_h |
| 6 #define WorkerBackingThread_h |
| 7 |
| 8 #include "core/CoreExport.h" |
| 9 #include "wtf/Forward.h" |
| 10 #include "wtf/OwnPtr.h" |
| 11 #include "wtf/PassOwnPtr.h" |
| 12 #include "wtf/ThreadingPrimitives.h" |
| 13 #include <v8.h> |
| 14 |
| 15 namespace blink { |
| 16 |
| 17 class WebThread; |
| 18 class WebThreadSupportingGC; |
| 19 |
| 20 // WorkerBackingThread represents a WebThread with Oilpan and V8 potentially |
| 21 // shared by multiple WebWorker scripts. A WebWorker needs to call attach() when |
| 22 // attaching itself to the backing thread, and call detach() when the script |
| 23 // no longer needs the thread. |
| 24 // A WorkerBackingThread represents a WebThread while a WorkerThread corresponds |
| 25 // to a web worker. There is one-to-one correspondence between WorkerThread and |
| 26 // WorkerGlobalScope, but multiple WorkerThreads (i.e., multiple |
| 27 // WorkerGlobalScopes) can share one WorkerBackingThread. |
| 28 class CORE_EXPORT WorkerBackingThread final { |
| 29 public: |
| 30 static PassOwnPtr<WorkerBackingThread> create(const char* name) { return ado
ptPtr(new WorkerBackingThread(name, false)); } |
| 31 static PassOwnPtr<WorkerBackingThread> create(WebThread* thread) { return ad
optPtr(new WorkerBackingThread(thread, false)); } |
| 32 |
| 33 // These are needed to suppress leak reports. See |
| 34 // https://crbug.com/590802 and https://crbug.com/v8/1428. |
| 35 static PassOwnPtr<WorkerBackingThread> createForTest(const char* name) { ret
urn adoptPtr(new WorkerBackingThread(name, true)); } |
| 36 static PassOwnPtr<WorkerBackingThread> createForTest(WebThread* thread) { re
turn adoptPtr(new WorkerBackingThread(thread, true)); } |
| 37 |
| 38 ~WorkerBackingThread(); |
| 39 |
| 40 // attach() and detach() attaches and detaches Oilpan and V8 to / from |
| 41 // the caller worker script, respectively. attach() and detach() increments |
| 42 // and decrements m_workerScriptCount. attach() initializes Oilpan and V8 |
| 43 // when m_workerScriptCount is 0. detach() terminates Oilpan and V8 when |
| 44 // m_workerScriptCount is 1. A worker script must not call any function |
| 45 // after calling detach(). |
| 46 // They should be called from |this| thread. |
| 47 void attach(); |
| 48 void detach(); |
| 49 |
| 50 unsigned workerScriptCount() |
| 51 { |
| 52 MutexLocker locker(m_mutex); |
| 53 return m_workerScriptCount; |
| 54 } |
| 55 |
| 56 WebThreadSupportingGC& backingThread() |
| 57 { |
| 58 ASSERT(m_backingThread); |
| 59 return *m_backingThread; |
| 60 } |
| 61 |
| 62 v8::Isolate* isolate() { return m_isolate; } |
| 63 |
| 64 private: |
| 65 WorkerBackingThread(const char* name, bool shouldCallGCOnShutdown); |
| 66 WorkerBackingThread(WebThread*, bool shouldCallGCOnSHutdown); |
| 67 void initialize(); |
| 68 void shutdown(); |
| 69 |
| 70 // Protects |m_workerScriptCount|. |
| 71 Mutex m_mutex; |
| 72 OwnPtr<WebThreadSupportingGC> m_backingThread; |
| 73 v8::Isolate* m_isolate = nullptr; |
| 74 unsigned m_workerScriptCount = 0; |
| 75 bool m_isOwningThread; |
| 76 bool m_shouldCallGCOnShutdown; |
| 77 }; |
| 78 |
| 79 } // namespace blink |
| 80 |
| 81 #endif // WorkerBackingThread_h |
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