88 lines
1.7 KiB
C
88 lines
1.7 KiB
C
|
/******************************************************************************
|
||
|
|
*
|
||
|
|
* Copyright (c) 2000 Microsoft Corporation
|
||
|
|
*
|
||
|
|
* Module Name:
|
||
|
|
* counter.h
|
||
|
|
*
|
||
|
|
* Abstract:
|
||
|
|
* simple counter class - up/down counter, wait till zero
|
||
|
|
*
|
||
|
|
* Revision History:
|
||
|
|
* Brijesh Krishnaswami (brijeshk) 05/02/2000
|
||
|
|
* created
|
||
|
|
*
|
||
|
|
*****************************************************************************/
|
||
|
|
|
||
|
|
#ifndef _COUNTER_H_
|
||
|
|
#define _COUNTER_H_
|
||
|
|
|
||
|
|
#include <windows.h>
|
||
|
|
|
||
|
|
#define INLINE_EXPORT_SPEC __declspec( dllexport)
|
||
|
|
|
||
|
|
class INLINE_EXPORT_SPEC CCounter
|
||
|
|
{
|
||
|
|
private:
|
||
|
|
HANDLE _hEvent;
|
||
|
|
LONG _lCount;
|
||
|
|
|
||
|
|
public:
|
||
|
|
CCounter( )
|
||
|
|
{
|
||
|
|
_lCount = 0;
|
||
|
|
_hEvent = NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
DWORD Init ()
|
||
|
|
{
|
||
|
|
_hEvent = CreateEvent ( NULL, TRUE, TRUE, L"SRCounter" );
|
||
|
|
return _hEvent == NULL ? GetLastError() : ERROR_SUCCESS;
|
||
|
|
}
|
||
|
|
|
||
|
|
~CCounter( )
|
||
|
|
{
|
||
|
|
if ( _hEvent != NULL )
|
||
|
|
CloseHandle( _hEvent );
|
||
|
|
}
|
||
|
|
|
||
|
|
void Up( )
|
||
|
|
{
|
||
|
|
if (InterlockedIncrement (&_lCount) == 1)
|
||
|
|
{
|
||
|
|
if (_hEvent != NULL)
|
||
|
|
ResetEvent ( _hEvent );
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
DWORD Down( )
|
||
|
|
{
|
||
|
|
if ( InterlockedDecrement(&_lCount) == 0 )
|
||
|
|
{
|
||
|
|
if (_hEvent != NULL && FALSE == SetEvent ( _hEvent ))
|
||
|
|
{
|
||
|
|
return GetLastError();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return ERROR_SUCCESS;
|
||
|
|
}
|
||
|
|
|
||
|
|
DWORD WaitForZero( )
|
||
|
|
{
|
||
|
|
if (_hEvent != NULL)
|
||
|
|
{
|
||
|
|
return WaitForSingleObject( _hEvent, 10 * 60000 ); /* 10 minutes */
|
||
|
|
}
|
||
|
|
else
|
||
|
|
return ERROR_INTERNAL_ERROR;
|
||
|
|
}
|
||
|
|
|
||
|
|
LONG GetCount( )
|
||
|
|
{
|
||
|
|
return _lCount;
|
||
|
|
}
|
||
|
|
|
||
|
|
};
|
||
|
|
|
||
|
|
#endif
|