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