1 // Copyright (c) 2012 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 BASE_MESSAGE_LOOP_MESSAGE_LOOP_PROXY_H_ 6 #define BASE_MESSAGE_LOOP_MESSAGE_LOOP_PROXY_H_ 7 8 #include "base/base_export.h" 9 #include "base/compiler_specific.h" 10 #include "base/memory/ref_counted.h" 11 #include "base/single_thread_task_runner.h" 12 13 namespace base { 14 15 // This class provides a thread-safe refcounted interface to the Post* methods 16 // of a message loop. This class can outlive the target message loop. 17 // MessageLoopProxy objects are constructed automatically for all MessageLoops. 18 // So, to access them, you can use any of the following: 19 // Thread::message_loop_proxy() 20 // MessageLoop::current()->message_loop_proxy() 21 // MessageLoopProxy::current() 22 // 23 // TODO(akalin): Now that we have the *TaskRunner interfaces, we can 24 // merge this with MessageLoopProxyImpl. 25 class BASE_EXPORT MessageLoopProxy : public SingleThreadTaskRunner { 26 public: 27 // Gets the MessageLoopProxy for the current message loop, creating one if 28 // needed. 29 static scoped_refptr<MessageLoopProxy> current(); 30 31 protected: 32 MessageLoopProxy(); 33 virtual ~MessageLoopProxy(); 34 }; 35 36 } // namespace base 37 38 #endif // BASE_MESSAGE_LOOP_MESSAGE_LOOP_PROXY_H_ 39