Adds a modified copy of talk/base to webrtc/base. It is the first step in migrating talk/base to webrtc/base.

BUG=N/A
R=andrew@webrtc.org, wu@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/12199004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@6107 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/base/asyncfile.h

@@ -0,0 +1,40 @@
+/*
+ *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_BASE_ASYNCFILE_H__
+#define WEBRTC_BASE_ASYNCFILE_H__
+
+#include "webrtc/base/sigslot.h"
+
+namespace rtc {
+
+// Provides the ability to perform file I/O asynchronously.
+// TODO: Create a common base class with AsyncSocket.
+class AsyncFile {
+ public:
+  AsyncFile();
+  virtual ~AsyncFile();
+
+  // Determines whether the file will receive read events.
+  virtual bool readable() = 0;
+  virtual void set_readable(bool value) = 0;
+
+  // Determines whether the file will receive write events.
+  virtual bool writable() = 0;
+  virtual void set_writable(bool value) = 0;
+
+  sigslot::signal1<AsyncFile*> SignalReadEvent;
+  sigslot::signal1<AsyncFile*> SignalWriteEvent;
+  sigslot::signal2<AsyncFile*, int> SignalCloseEvent;
+};
+
+}  // namespace rtc
+
+#endif  // WEBRTC_BASE_ASYNCFILE_H__