Created a MessageLoopProxy interface. This provides a thread-safe refcounted ...

base/message_loop_proxy.h

+// Copyright (c) 2010 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 BASE_MESSAGE_LOOP_PROXY_H_
+#define BASE_MESSAGE_LOOP_PROXY_H_
+
+#include "base/basictypes.h"
+#include "base/ref_counted.h"
+#include "base/task.h"
+
+// This class provides a thread-safe refcounted interface to the Post* methods
+// of a message loop. This class can outlive the target message loop.
+class MessageLoopProxy : public base::RefCountedThreadSafe<MessageLoopProxy> {
+ public:
+  // These are the same methods in message_loop.h, but are guaranteed to either
+  // get posted to the MessageLoop if it's still alive, or be deleted otherwise.
+  // They return true iff the thread existed and the task was posted.  Note that
+  // even if the task is posted, there's no guarantee that it will run, since
+  // the target thread may already have a Quit message in its queue.
+  virtual bool PostTask(const tracked_objects::Location& from_here,
+                        Task* task) = 0;
+  virtual bool PostDelayedTask(const tracked_objects::Location& from_here,
+                               Task* task, int64 delay_ms) = 0;
+  virtual bool PostNonNestableTask(const tracked_objects::Location& from_here,
+                                   Task* task) = 0;
+  virtual bool PostNonNestableDelayedTask(
+      const tracked_objects::Location& from_here,
+      Task* task,
+      int64 delay_ms) = 0;
+
+  template <class T>
+  bool DeleteSoon(const tracked_objects::Location& from_here,
+                  T* object) {
+    return PostNonNestableTask(from_here, new DeleteTask<T>(object));
+  }
+  template <class T>
+  bool ReleaseSoon(const tracked_objects::Location& from_here,
+                   T* object) {
+    return PostNonNestableTask(from_here, new ReleaseTask<T>(object));
+  }
+};
+
+#endif  // BASE_MESSAGE_LOOP_PROXY_H_
+