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      1 /*
      2  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
      3  *
      4  *  Use of this source code is governed by a BSD-style license
      5  *  that can be found in the LICENSE file in the root of the source
      6  *  tree. An additional intellectual property rights grant can be found
      7  *  in the file PATENTS.  All contributing project authors may
      8  *  be found in the AUTHORS file in the root of the source tree.
      9  */
     10 
     11 #include "event_win.h"
     12 
     13 #include "Mmsystem.h"
     14 
     15 namespace webrtc {
     16 EventWindows::EventWindows()
     17     : _event(::CreateEvent(NULL  /* security attributes */,
     18                            FALSE /* manual reset */,
     19                            FALSE /* initial state */,
     20                            NULL  /* name of event */)),
     21       _timerID(NULL)
     22 {
     23 }
     24 
     25 EventWindows::~EventWindows()
     26 {
     27     CloseHandle(_event);
     28 }
     29 
     30 bool EventWindows::Set()
     31 {
     32     // Note: setting an event that is already set has no effect.
     33     return SetEvent(_event) == 1 ? true : false;
     34 }
     35 
     36 bool EventWindows::Reset()
     37 {
     38     return ResetEvent(_event) == 1 ? true : false;
     39 }
     40 
     41 EventTypeWrapper EventWindows::Wait(unsigned long maxTime)
     42 {
     43     unsigned long res = WaitForSingleObject(_event, maxTime);
     44     switch(res)
     45     {
     46     case WAIT_OBJECT_0:
     47         return kEventSignaled;
     48     case WAIT_TIMEOUT:
     49         return kEventTimeout;
     50     default:
     51         return kEventError;
     52     }
     53 }
     54 
     55 bool EventWindows::StartTimer(bool periodic, unsigned long time)
     56 {
     57     if (_timerID != NULL)
     58     {
     59         timeKillEvent(_timerID);
     60         _timerID=NULL;
     61     }
     62     if (periodic)
     63     {
     64         _timerID=timeSetEvent(time, 0,(LPTIMECALLBACK)HANDLE(_event),0,
     65                               TIME_PERIODIC|TIME_CALLBACK_EVENT_PULSE);
     66     } else {
     67         _timerID=timeSetEvent(time, 0,(LPTIMECALLBACK)HANDLE(_event),0,
     68                               TIME_ONESHOT|TIME_CALLBACK_EVENT_SET);
     69     }
     70 
     71     if (_timerID == NULL)
     72     {
     73         return false;
     74     }
     75     return true;
     76 }
     77 
     78 bool EventWindows::StopTimer()
     79 {
     80     timeKillEvent(_timerID);
     81     _timerID = NULL;
     82     return true;
     83 }
     84 } // namespace webrtc
     85