Revert of Implement timers by posting delayed tasks

Source/core/workers/WorkerThread.cpp

 /*
  * 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 20 matching lines @@
 #include "bindings/core/v8/ScriptSourceCode.h"
 #include "bindings/core/v8/V8GCController.h"
 #include "bindings/core/v8/V8Initializer.h"
 #include "core/dom/Microtask.h"
 #include "core/inspector/InspectorInstrumentation.h"
 #include "core/inspector/WorkerInspectorController.h"
 #include "core/workers/DedicatedWorkerGlobalScope.h"
 #include "core/workers/WorkerClients.h"
 #include "core/workers/WorkerReportingProxy.h"
 #include "core/workers/WorkerThreadStartupData.h"
+#include "platform/PlatformThreadData.h"
 #include "platform/Task.h"
 #include "platform/ThreadSafeFunctional.h"
+#include "platform/ThreadTimers.h"
 #include "platform/heap/SafePoint.h"
 #include "platform/heap/ThreadState.h"
 #include "platform/weborigin/KURL.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebScheduler.h"
 #include "public/platform/WebThread.h"
 #include "public/platform/WebWaitableEvent.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/WeakPtr.h"
 #include "wtf/text/WTFString.h"
@@ skipping 49 matching lines @@
     DEFINE_STATIC_LOCAL(HashSet<WorkerThread*>, threads, ());
     return threads;
 }
 
 unsigned WorkerThread::workerThreadCount()
 {
     MutexLocker lock(threadSetMutex());
     return workerThreads().size();
 }
 
+class WorkerThreadCancelableTask final : public ExecutionContextTask {
+    WTF_MAKE_NONCOPYABLE(WorkerThreadCancelableTask); WTF_MAKE_FAST_ALLOCATED(WorkerThreadCancelableTask);
+public:
+    static PassOwnPtr<WorkerThreadCancelableTask> create(PassOwnPtr<Closure> closure)
+    {
+        return adoptPtr(new WorkerThreadCancelableTask(closure));
+    }
+
+    virtual ~WorkerThreadCancelableTask() { }
+
+    virtual void performTask(ExecutionContext*) override
+    {
+        if (!m_taskCanceled)
+            (*m_closure)();
+    }
+
+    WeakPtr<WorkerThreadCancelableTask> createWeakPtr() { return m_weakFactory.createWeakPtr(); }
+    void cancelTask() { m_taskCanceled = true; }
+
+private:
+    explicit WorkerThreadCancelableTask(PassOwnPtr<Closure> closure)
+        : m_closure(closure)
+        , m_weakFactory(this)
+        , m_taskCanceled(false)
+    { }
+
+    OwnPtr<Closure> m_closure;
+    WeakPtrFactory<WorkerThreadCancelableTask> m_weakFactory;
+    bool m_taskCanceled;
+};
+
+class WorkerSharedTimer : public SharedTimer {
+public:
+    explicit WorkerSharedTimer(WorkerThread* workerThread)
+        : m_workerThread(workerThread)
+        , m_running(false)
+    { }
+
+    typedef void (*SharedTimerFunction)();
+    virtual void setFiredFunction(SharedTimerFunction func)
+    {
+        m_sharedTimerFunction = func;
+    }
+
+    virtual void setFireInterval(double interval)
+    {
+        ASSERT(m_sharedTimerFunction);
+
+        // See BlinkPlatformImpl::setSharedTimerFireInterval for explanation of
+        // why ceil is used in the interval calculation.
+        int64_t delay = static_cast<int64_t>(ceil(interval * 1000));
+
+        if (delay < 0) {
+            delay = 0;
+        }
+
+        m_running = true;
+
+        if (m_lastQueuedTask.get())
+            m_lastQueuedTask->cancelTask();
+
+        // Now queue the task as a cancellable one.
+        OwnPtr<WorkerThreadCancelableTask> task = WorkerThreadCancelableTask::create(bind(&WorkerSharedTimer::OnTimeout, this));
+        m_lastQueuedTask = task->createWeakPtr();
+        m_workerThread->postDelayedTask(FROM_HERE, task.release(), delay);
+    }
+
+    virtual void stop()
+    {
+        m_running = false;
+        m_lastQueuedTask = nullptr;
+    }
+
+private:
+    void OnTimeout()
+    {
+        ASSERT(m_workerThread->workerGlobalScope());
+
+        m_lastQueuedTask = nullptr;
+
+        if (m_sharedTimerFunction && m_running && !m_workerThread->workerGlobalScope()->isClosing())
+            m_sharedTimerFunction();
+    }
+
+    WorkerThread* m_workerThread;
+    SharedTimerFunction m_sharedTimerFunction;
+    bool m_running;
+
+    // The task to run OnTimeout, if any. While OnTimeout resets
+    // m_lastQueuedTask, this must be a weak pointer because the
+    // worker runloop may delete the task as it is shutting down.
+    WeakPtr<WorkerThreadCancelableTask> m_lastQueuedTask;
+};
+
 class WorkerThreadTask : public WebThread::Task {
     WTF_MAKE_NONCOPYABLE(WorkerThreadTask); WTF_MAKE_FAST_ALLOCATED(WorkerThreadTask);
 public:
     static PassOwnPtr<WorkerThreadTask> create(WorkerThread& workerThread, PassOwnPtr<ExecutionContextTask> task, bool isInstrumented)
     {
         return adoptPtr(new WorkerThreadTask(workerThread, task, isInstrumented));
     }
 
     virtual ~WorkerThreadTask() { }
 
@@ skipping 96 matching lines @@
             return;
         }
 
         m_microtaskRunner = adoptPtr(new WorkerMicrotaskRunner(this));
         backingThread().addTaskObserver(m_microtaskRunner.get());
         backingThread().initialize();
 
         m_isolate = initializeIsolate();
         m_workerGlobalScope = createWorkerGlobalScope(startupData);
         m_workerGlobalScope->scriptLoaded(sourceCode.length(), cachedMetaData.get() ? cachedMetaData->size() : 0);
+
+        PlatformThreadData::current().threadTimers().setSharedTimer(adoptPtr(new WorkerSharedTimer(this)));
     }
 
     // The corresponding call to stopRunLoop() is in ~WorkerScriptController().
     didStartRunLoop();
 
     // Notify proxy that a new WorkerGlobalScope has been created and started.
     m_workerReportingProxy.workerGlobalScopeStarted(m_workerGlobalScope.get());
 
     WorkerScriptController* script = m_workerGlobalScope->script();
     if (!script->isExecutionForbidden())
@@ skipping 13 matching lines @@
 
 void WorkerThread::shutdown()
 {
     ASSERT(isCurrentThread());
     {
         MutexLocker lock(m_threadStateMutex);
         ASSERT(!m_shutdown);
         m_shutdown = true;
     }
 
+    PlatformThreadData::current().threadTimers().setSharedTimer(nullptr);
     workerGlobalScope()->dispose();
     willDestroyIsolate();
 
     // This should be called before we start the shutdown procedure.
     workerReportingProxy().willDestroyWorkerGlobalScope();
 
     // The below assignment will destroy the context, which will in turn notify messaging proxy.
     // We cannot let any objects survive past thread exit, because no other thread will run GC or otherwise destroy them.
     // If Oilpan is enabled, we detach of the context/global scope, with the final heap cleanup below sweeping it out.
 #if !ENABLE(OILPAN)
     ASSERT(m_workerGlobalScope->hasOneRef());
 #endif
     m_workerGlobalScope->notifyContextDestroyed();
     m_workerGlobalScope = nullptr;
 
     backingThread().removeTaskObserver(m_microtaskRunner.get());
     backingThread().shutdown();
     destroyIsolate();
 
     m_microtaskRunner = nullptr;
 
     // Notify the proxy that the WorkerGlobalScope has been disposed of.
     // This can free this thread object, hence it must not be touched afterwards.
     workerReportingProxy().workerThreadTerminated();
 
     m_terminationEvent->signal();
+
+    // Clean up PlatformThreadData before WTF::WTFThreadData goes away!
+    PlatformThreadData::current().destroy();
 }
 
 
 void WorkerThread::stop()
 {
     // Prevent the deadlock between GC and an attempt to stop a thread.
     SafePointScope safePointScope(ThreadState::HeapPointersOnStack);
     stopInternal();
 }
 
@@ skipping 181 matching lines @@
     InspectorInstrumentation::didLeaveNestedRunLoop(m_workerGlobalScope.get());
 }
 
 void WorkerThread::setWorkerInspectorController(WorkerInspectorController* workerInspectorController)
 {
     MutexLocker locker(m_workerInspectorControllerMutex);
     m_workerInspectorController = workerInspectorController;
 }
 
 } // namespace blink