git-svn-id: http://webrtc.googlecode.com/svn/trunk@6 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/system_wrappers/interface/event_wrapper.h b/system_wrappers/interface/event_wrapper.h
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+/*
+ * Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ * Use of this source code is governed by a BSD-style license
+ * that can be found in the LICENSE file in the root of the source
+ * tree. An additional intellectual property rights grant can be found
+ * in the file PATENTS. All contributing project authors may
+ * be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_SYSTEM_WRAPPERS_INTERFACE_EVENT_WRAPPER_H_
+#define WEBRTC_SYSTEM_WRAPPERS_INTERFACE_EVENT_WRAPPER_H_
+
+namespace webrtc {
+enum EventTypeWrapper
+{
+ kEventSignaled = 1,
+ kEventError = 2,
+ kEventTimeout = 3
+};
+
+#define WEBRTC_EVENT_10_SEC 10000
+#define WEBRTC_EVENT_INFINITE 0xffffffff
+
+class EventWrapper
+{
+public:
+ // Factory method. Constructor disabled.
+ static EventWrapper* Create();
+ virtual ~EventWrapper() {}
+
+ // Releases threads who are calling Wait() and has started waiting. Please
+ // note that a thread calling Wait() will not start waiting immediately.
+ // assumptions to the contrary is a very common source of issues in
+ // multithreaded programming.
+ // Set is sticky in the sense that it will release at least one thread
+ // either immediately or some time in the future.
+ virtual bool Set() = 0;
+
+ // Prevents future Wait() calls from finishing without a new Set() call.
+ virtual bool Reset() = 0;
+
+ // Puts the calling thread into a wait state. The thread may be released
+ // by a Set() call depending on if other threads are waiting and if so on
+ // timing. The thread that was released will call Reset() before leaving
+ // preventing more threads from being released. If multiple threads
+ // are waiting for the same Set(), only one (random) thread is guaranteed to
+ // be released. It is possible that multiple (random) threads are released
+ // Depending on timing.
+ virtual EventTypeWrapper Wait(unsigned long maxTime) = 0;
+
+ // Starts a timer that will call a non-sticky version of Set() either once
+ // or periodically. If the timer is periodic it ensures that there is no
+ // drift over time relative to the system clock.
+ virtual bool StartTimer(bool periodic, unsigned long time) = 0;
+
+ virtual bool StopTimer() = 0;
+
+ // Only implemented on Windows
+ // Returns 1 if a key has been pressed since last call to this function.
+ // -1 indicates failure
+ // 0 indicates no key has been pressed since last call
+ // TODO(hellner) this function does not seem to belong here
+ static int KeyPressed();
+};
+} // namespace webrtc
+
+#endif // WEBRTC_SYSTEM_WRAPPERS_INTERFACE_EVENT_WRAPPER_H_