Add DeviceListener and PipeNotifier to Forwarder2.

The big picture CL can be seem here: https://chromiumcodereview.appspot.com/10918057/

BUG=146502


Review URL: https://chromiumcodereview.appspot.com/10909170

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@156120 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 35 insertions, 0 deletions

diff --git a/tools/android/forwarder2/pipe_notifier.h b/tools/android/forwarder2/pipe_notifier.h
new file mode 100644
index 0000000..efe303b
--- /dev/null
+++ b/tools/android/forwarder2/pipe_notifier.h
@@ -0,0 +1,35 @@
+// Copyright (c) 2012 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 TOOLS_ANDROID_FORWARDER2_PIPE_NOTIFIER_H_
+#define TOOLS_ANDROID_FORWARDER2_PIPE_NOTIFIER_H_
+
+#include "base/basictypes.h"
+
+namespace forwarder2 {
+
+// Helper class used to create a unix pipe that sends notifications to the
+// |receiver_fd_| file descriptor when called |Notify()|.  This should be used
+// by the main thread to notify other threads that it must exit.
+// The |receiver_fd_| can be put into a fd_set and used in a select together
+// with a socket waiting to accept or read.
+class PipeNotifier {
+ public:
+  PipeNotifier();
+  ~PipeNotifier();
+
+  bool Notify();
+
+  int receiver_fd() const { return receiver_fd_; }
+
+ private:
+  int sender_fd_;
+  int receiver_fd_;
+
+  DISALLOW_COPY_AND_ASSIGN(PipeNotifier);
+};
+
+}  // namespace forwarder
+
+#endif  // TOOLS_ANDROID_FORWARDER2_PIPE_NOTIFIER_H_