[NaCl SDK] Support non blocking TCP/UDP

native_client_sdk/src/libraries/nacl_io/event_emitter_stream.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_STREAM_H_
+#define LIBRARIES_NACL_IO_EVENT_EMITTER_STREAM_H_
+
+#include "nacl_io/event_emitter.h"
+
+#include "sdk_util/macros.h"
+#include "sdk_util/scoped_ref.h"
+
+namespace nacl_io {
+
+class EventEmitterStream;
+class FIFOInterface;
+class MountNodeStream;
+
+typedef sdk_util::ScopedRef<EventEmitterStream> ScopedEventEmitterStream;
+
+class EventEmitterStream : public EventEmitter {
+ public:
+  EventEmitterStream();
+
+  void AttachStream(MountNodeStream* stream);
+  void DetachStream();
+
+  MountNodeStream* stream() { return stream_; }
+  virtual FIFOInterface* rx_fifo() = 0;
+  virtual FIFOInterface* tx_fifo() = 0;
+
+protected:
+  void UpdateStatus_Locked();
+
+protected:
+  MountNodeStream* stream_;
+  DISALLOW_COPY_AND_ASSIGN(EventEmitterStream);
+};
+
+}  // namespace nacl_io
+
+#endif  // LIBRARIES_NACL_IO_EVENT_EMITTER_STREAM_H_
+