[NaCl SDK] Support non blocking TCP/UDP

native_client_sdk/src/libraries/nacl_io/event_emitter_signal.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_SIGNAL_H_
+#define LIBRARIES_NACL_IO_EVENT_EMITTER_SIGNAL_H_
+
+#include <poll.h>
+
+#include "nacl_io/event_emitter.h"
+#include "sdk_util/auto_lock.h"
+#include "sdk_util/scoped_ref.h"
+
+namespace nacl_io {
+
+class EventEmitterSignal;
+typedef sdk_util::ScopedRef<EventEmitterSignal> ScopedEmitterSignal;
+
+class EventEmitterSignal : public EventEmitter {
+public:
+  EventEmitterSignal() : events_(0) {};
+
+  virtual uint32_t GetEventStatus() { return events_; }
+
+  void Raise(uint32_t events) {
+    AUTO_LOCK(emitter_lock_);
+    events_ |= events;
+    RaiseEvents_Locked(POLLERR);
+  }
+
+  void Clear(uint32_t events) {
+    AUTO_LOCK(emitter_lock_);
+    events_ &= ~events;
+  }
+
+ protected:
+  uint32_t events_;
+};
+
+}  // namespace nacl_io
+
+#endif  // LIBRARIES_NACL_IO_EVENT_EMITTER_SIGNAL_H_
+