Refactor TimeBase to post tasks. Workers to use real Idle tasks.

Source/core/workers/WorkerThread.h

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 29 matching lines @@
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefCounted.h"
 #include <v8.h>
 
 namespace blink {
 
 class WebWaitableEvent;
 class WorkerGlobalScope;
 class WorkerInspectorController;
 class WorkerReportingProxy;
-class WorkerSharedTimer;
 class WorkerThreadShutdownFinishTask;
 class WorkerThreadStartupData;
 class WorkerThreadTask;
 
 enum WorkerThreadStartMode {
     DontPauseWorkerGlobalScopeOnStart,
     PauseWorkerGlobalScopeOnStart
 };
 
 class CORE_EXPORT WorkerThread : public RefCounted<WorkerThread> {
@@ skipping 30 matching lines @@
     void postDebuggerTask(const WebTraceLocation&, PassOwnPtr<ExecutionContextTask>);
 
     enum WaitMode { WaitForMessage, DontWaitForMessage };
     MessageQueueWaitResult runDebuggerTask(WaitMode = WaitForMessage);
 
     // These methods should be called if the holder of the thread is
     // going to call runDebuggerTask in a loop.
     void willEnterNestedLoop();
     void didLeaveNestedLoop();
 
+    // Prevent execution of all non-shutdown tasks.
+    void preShutdown();
+
     WorkerGlobalScope* workerGlobalScope() const { return m_workerGlobalScope.get(); }
-    bool terminated();
+
+    // Virtual for testing.
+    virtual bool terminated();
 
     // Number of active worker threads.
     static unsigned workerThreadCount();
 
     PlatformThreadId platformThreadId() const;
 
     void interruptAndDispatchInspectorCommands();
     void setWorkerInspectorController(WorkerInspectorController*);
 
 protected:
     WorkerThread(const char* threadName, PassRefPtr<WorkerLoaderProxy>, WorkerReportingProxy&, PassOwnPtr<WorkerThreadStartupData>);
 
     // Factory method for creating a new worker context for the thread.
     virtual PassRefPtrWillBeRawPtr<WorkerGlobalScope> createWorkerGlobalScope(PassOwnPtr<WorkerThreadStartupData>) = 0;
 
     virtual void postInitialize() { }
 
     virtual v8::Isolate* initializeIsolate();
     virtual void willDestroyIsolate();
     virtual void destroyIsolate();
     virtual void terminateV8Execution();
 
+    // This is protected virtual for testing.
+    virtual bool doIdleGc(double deadlineSeconds);
+
+    WebScheduler* schedulerForTesting() const
+    {
+        return m_webScheduler;
+    }
+
+    WebThreadSupportingGC* threadForTesting() const
+    {
+        return m_thread.get();
+    }
+
 private:
-    friend class WorkerSharedTimer;
+    friend class WorkerThreadIdleTask;
     friend class WorkerThreadShutdownFinishTask;
 
     void stopInShutdownSequence();
     void stopInternal();
 
     void initialize();
     void cleanup();
-    void idleHandler();
+    void idleTask(double deadlineSeconds);
     void postDelayedTask(PassOwnPtr<ExecutionContextTask>, long long delayMs);
     void postDelayedTask(const WebTraceLocation&, PassOwnPtr<ExecutionContextTask>, long long delayMs);
 
     const char* m_threadName;
     bool m_terminated;
     MessageQueue<WorkerThreadTask> m_debuggerMessageQueue;
     OwnPtr<WebThread::TaskObserver> m_microtaskRunner;
 
     RefPtr<WorkerLoaderProxy> m_workerLoaderProxy;
     WorkerReportingProxy& m_workerReportingProxy;
 
     RefPtrWillBePersistent<WorkerInspectorController> m_workerInspectorController;
     Mutex m_workerInspectorControllerMutex;
 
     Mutex m_threadCreationMutex;
     RefPtrWillBePersistent<WorkerGlobalScope> m_workerGlobalScope;
     OwnPtr<WorkerThreadStartupData> m_startupData;
 
     v8::Isolate* m_isolate;
     OwnPtr<V8IsolateInterruptor> m_interruptor;
 
     // Used to signal thread shutdown.
     OwnPtr<WebWaitableEvent> m_shutdownEvent;
 
     // Used to signal thread termination.
     OwnPtr<WebWaitableEvent> m_terminationEvent;
 
+    RawPtr<WebScheduler> m_webScheduler; // NOT OWNED.
+
+    Mutex m_preShutdownMutex;
+    bool m_preShutdown;
+
     // FIXME: This has to be last because of crbug.com/401397 - the
     // WorkerThread might get deleted before it had a chance to properly
     // shut down. By deleting the WebThread first, we can guarantee that
     // no pending tasks on the thread might want to access any of the other
     // members during the WorkerThread's destruction.
     OwnPtr<WebThreadSupportingGC> m_thread;
 };
 
 } // namespace blink
 
 #endif // WorkerThread_h