Track webcore worker message loops in chromium.

content/common/worker_task_runner.h

+// Copyright (c) 2011 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.
+
+#ifndef CONTENT_COMMON_WORKER_TASK_RUNNER_H_
+#define CONTENT_COMMON_WORKER_TASK_RUNNER_H_
+#pragma once
+
+#include "base/callback_forward.h"
+#include "base/memory/ref_counted.h"
+#include "base/observer_list.h"
+#include "base/synchronization/lock.h"
+#include "base/threading/thread_local.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebWorkerRunLoop.h"
+
+#include <map>
+
+
+class WorkerTaskRunner : public base::RefCountedThreadSafe<WorkerTaskRunner> {
+ public:
+  WorkerTaskRunner();
+  ~WorkerTaskRunner();
+  // This could be changed to take a chromium closure that is then wrapped by

[michaeln, 2011/12/06 02:28:22]

this comment is stale

+  // this class.
+  void PostTask(int id, const base::Closure& task);
+  int CurrentWorkerId();
+
+  class Observer {
+   public:
+    virtual ~Observer() {}
+    virtual void OnWorkerRunLoopStarted();
+    virtual void OnWorkerRunLoopStopped();
+  };
+  // Can be called on any thread.  The notifications will be called on the
+  // worker thread in question.
+  void AddObserver(Observer* obs);
+  // Unlike most Observerlists, observers can't remove themselves from this one
+  // during a notification.  Deadlock may result.
+  void RemoveObserver(Observer* obs);
+
+ private:
+  friend class RendererWebKitPlatformSupportImpl;
+
+  typedef std::map<int, WebKit::WebWorkerRunLoop> IDToLoopMap;
+
+  void OnWorkerRunLoopStarted(const WebKit::WebWorkerRunLoop& loop);
+  void OnWorkerRunLoopStopped(const WebKit::WebWorkerRunLoop& loop);
+
+  base::ThreadLocalPointer<std::pair<int, WebKit::WebWorkerRunLoop> >
+      current_tls_;
+
+  base::Lock lock_;
+  int id_sequence_;
+  IDToLoopMap loop_map_;
+
+  ObserverList<Observer> observer_list_;
+  base::Lock observer_lock_;
+};
+
+#endif  // CONTENT_COMMON_SOCKET_STREAM_H_