system_wrappers: rename interface -> include

webrtc/system_wrappers/interface/event_wrapper.h

-/*
- *  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_INFINITE 0xffffffff
-
-class EventTimerWrapper;
-
-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;
-
-  // 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 reset the event 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.
-  //
-  // |max_time| is the maximum time to wait in milliseconds or
-  // WEBRTC_EVENT_INFINITE to wait infinitely.
-  virtual EventTypeWrapper Wait(unsigned long max_time) = 0;
-};
-
-class EventTimerWrapper : public EventWrapper {
- public:
-  static EventTimerWrapper* Create();
-
-  // 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.
-  //
-  // |time| is in milliseconds.
-  virtual bool StartTimer(bool periodic, unsigned long time) = 0;
-
-  virtual bool StopTimer() = 0;
-
-};
-
-}  // namespace webrtc
-
-#endif  // WEBRTC_SYSTEM_WRAPPERS_INTERFACE_EVENT_WRAPPER_H_