Add forwarder2

tools/android/forwarder2/device_listener.h

Index: tools/android/forwarder2/device_listener.h
diff --git a/tools/android/forwarder2/device_listener.h b/tools/android/forwarder2/device_listener.h
new file mode 100644
index 0000000000000000000000000000000000000000..a7380d1f2856e59111beb1339125ba66e89fb9b0
--- /dev/null
+++ b/tools/android/forwarder2/device_listener.h
@@ -0,0 +1,78 @@
+// 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_DEVICE_LISTENER_H_
+#define TOOLS_ANDROID_FORWARDER2_DEVICE_LISTENER_H_
+
+#include <pthread.h>
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "base/logging.h"
+#include "base/memory/scoped_ptr.h"
+#include "tools/android/forwarder2/pipe_notifier.h"
+#include "tools/android/forwarder2/socket.h"
+#include "tools/android/forwarder2/thread.h"
+
+namespace forwarder {
+
+class Forwarder;
+
+class DeviceListener : public Thread {
+ public:
+  DeviceListener(scoped_ptr<Socket> adb_control_socket, int port);
+  virtual ~DeviceListener();
+
+  bool WaitForAdbDataSocket();
+
+  bool SetAdbDataSocket(scoped_ptr<Socket> adb_data_socket);
+
+  // |is_alive_| is set only on creation and written once when Run() terminates.
+  // So even in case of a race condition, the worst that could happen is for the
+  // main thread to see the lsitener alive when it isn't. And also, this is not
+  // a problem since the main thread checks the livenss of the listeners in a
+  // loop.
+  bool is_alive() const { return is_alive_; }
+  void ForceExit();
+
+ protected:
+  // Thread:
+  virtual void Run() OVERRIDE;
+
+ private:
+  // Must be called after successfully acquired mutex.
+  void SetMustExitLocked();
+
+  // The listener socket for sending control commands.
+  scoped_ptr<Socket> adb_control_socket_;
+
+  // The local device listener socket for accepting connections from the local
+  // port (listener_port_).
+  Socket listener_socket_;
+
+  // This is the adb connection to transport the actual data, used for creating
+  // the forwarder. Ownership transferred to the Forwarder.
+  scoped_ptr<Socket> adb_data_socket_;
+
+  const int listener_port_;
+  pthread_mutex_t adb_data_socket_mutex_;
+  pthread_cond_t adb_data_socket_cond_;
+  bool is_alive_;
+  bool must_exit_;
+
+  // Used for the listener thread to be notified from ForceExit() which is
+  // called from the main thread. We have one notifier per Listener thread since
+  // each Listener thread may be requested to exit for different reasons
+  // independently from each other and independent from the main program,
+  // ex. when the host requests to forward/listen the same port again.  Both the
+  // |adb_control_socket_| and |listener_socket_| must share the same receiver
+  // file descriptor from |exit_notifier_| and it is set in the constructor.
+  PipeNotifier exit_notifier_;
+
+  DISALLOW_COPY_AND_ASSIGN(DeviceListener);
+};
+
+}  // namespace forwarder
+
+#endif  // TOOLS_ANDROID_FORWARDER2_DEVICE_LISTENER_H_