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      1 /*
      2  *  Copyright (c) 2011 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 #ifndef WEBRTC_SYSTEM_WRAPPERS_SOURCE_CONDITION_VARIABLE_WINDOWS_H_
     12 #define WEBRTC_SYSTEM_WRAPPERS_SOURCE_CONDITION_VARIABLE_WINDOWS_H_
     13 
     14 #include "condition_variable_wrapper.h"
     15 
     16 #include <windows.h>
     17 
     18 namespace webrtc {
     19 #if !defined CONDITION_VARIABLE_INIT
     20     typedef struct _RTL_CONDITION_VARIABLE
     21     {
     22         void* Ptr;
     23     } RTL_CONDITION_VARIABLE, *PRTL_CONDITION_VARIABLE;
     24 
     25     typedef RTL_CONDITION_VARIABLE CONDITION_VARIABLE, *PCONDITION_VARIABLE;
     26 #endif
     27 
     28 typedef void (WINAPI *PInitializeConditionVariable)(PCONDITION_VARIABLE);
     29 typedef BOOL (WINAPI *PSleepConditionVariableCS)(PCONDITION_VARIABLE,
     30                                                  PCRITICAL_SECTION, DWORD);
     31 typedef void (WINAPI *PWakeConditionVariable)(PCONDITION_VARIABLE);
     32 typedef void (WINAPI *PWakeAllConditionVariable)(PCONDITION_VARIABLE);
     33 
     34 
     35 class ConditionVariableWindows : public ConditionVariableWrapper
     36 {
     37 public:
     38     ConditionVariableWindows();
     39     ~ConditionVariableWindows();
     40 
     41     void SleepCS(CriticalSectionWrapper& critSect);
     42     bool SleepCS(CriticalSectionWrapper& critSect, unsigned long maxTimeInMS);
     43     void Wake();
     44     void WakeAll();
     45 
     46 private:
     47     enum EventWakeUpType
     48     {
     49         WAKEALL_0   = 0,
     50         WAKEALL_1   = 1,
     51         WAKE        = 2,
     52         EVENT_COUNT = 3
     53     };
     54 
     55 private:
     56     // Native support for Windows Vista+
     57     static bool              _winSupportConditionVariablesPrimitive;
     58     CONDITION_VARIABLE       _conditionVariable;
     59 
     60     unsigned int     _numWaiters[2];
     61     EventWakeUpType  _eventID;
     62     CRITICAL_SECTION _numWaitersCritSect;
     63     HANDLE           _events[EVENT_COUNT];
     64 };
     65 } // namespace webrtc
     66 
     67 #endif // WEBRTC_SYSTEM_WRAPPERS_SOURCE_CONDITION_VARIABLE_WINDOWS_H_
     68