[NaCl SDK] Support non blocking TCP/UDP

native_client_sdk/src/libraries/nacl_io/event_emitter_udp.h

+// Copyright (c) 2013 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 LIBRARIES_NACL_IO_EVENT_EMITTER_UDP_H_
+#define LIBRARIES_NACL_IO_EVENT_EMITTER_UDP_H_
+
+#include "nacl_io/event_emitter_stream.h"
+#include "nacl_io/fifo_packet.h"
+
+#include "sdk_util/macros.h"
+#include "sdk_util/scoped_ref.h"
+
+namespace nacl_io {
+
+class EventEmitterUDP;
+typedef sdk_util::ScopedRef<EventEmitterUDP> ScopedEventEmitterUDP;
+
+class EventEmitterUDP : public EventEmitterStream {
+ public:
+  EventEmitterUDP(size_t rsize, size_t wsize);
+
+  // Takes or gives away ownership of the packet.
+  Packet* ReadRXPacket_Locked();
+  void WriteRXPacket_Locked(Packet* packet);
+
+  Packet* ReadTXPacket_Locked();
+  void WriteTXPacket_Locked(Packet* packet);
+
+  virtual FIFOPacket* in_fifo() { return &in_fifo_; }
+  virtual FIFOPacket* out_fifo() { return &out_fifo_; }
+
+protected:
+  FIFOPacket in_fifo_;
+  FIFOPacket out_fifo_;
+  DISALLOW_COPY_AND_ASSIGN(EventEmitterUDP);
+};
+
+}  // namespace nacl_io
+
+#endif  // LIBRARIES_NACL_IO_EVENT_EMITTER_UDP_H_
+