52 lines
1 KiB
C
52 lines
1 KiB
C
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/* xmtx.c -- mutex support for VC++ */
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#include "xmtx.h"
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#if !_MULTI_THREAD
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#else /* !_MULTI_THREAD */
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/* Win32 critical sections are recursive, but
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Win32 does not have once-function */
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void _Once(_Once_t *_Cntrl, void (*_Func)(void))
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{ /* execute _Func exactly one time */
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_Once_t old;
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if (*_Cntrl == 2)
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;
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else if ((old = InterlockedExchange(_Cntrl, 1)) == 0)
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{ /* execute _Func, mark as executed */
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_Func();
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*_Cntrl = 2;
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}
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else if (old == 2)
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*_Cntrl = 2;
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else
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while (*_Cntrl != 2)
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Sleep(1);
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}
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void _Mtxinit(_Rmtx *_Mtx)
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{ /* initialize mutex */
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InitializeCriticalSection(_Mtx);
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}
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void _Mtxdst(_Rmtx *_Mtx)
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{ /* delete mutex */
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DeleteCriticalSection(_Mtx);
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}
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void _Mtxlock(_Rmtx *_Mtx)
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{ /* lock mutex */
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EnterCriticalSection(_Mtx);
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}
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void _Mtxunlock(_Rmtx *_Mtx)
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{ /* unlock mutex */
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LeaveCriticalSection(_Mtx);
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}
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#endif /* !_MULTI_THREAD */
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/*
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* Copyright (c) 1992-2001 by P.J. Plauger. ALL RIGHTS RESERVED.
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* Consult your license regarding permissions and restrictions.
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V3.10:0009 */
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