36 lines
656 B
C
36 lines
656 B
C
/* SPINLOCK.H -- This file is the include file for spinlocks
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**
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** Created 04/20/93 by LaleD
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**
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*/
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#ifdef DEBUG
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void free_spinlock(long *);
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#else
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#define free_spinlock(a) *(a) = 0 ;
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#endif
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/*
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** When /Ogb1 or /Ogb2 flag is used in the compiler, this function will
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** be expanded in line
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*/
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__inline int get_spinlock(long VOLATILE *plock, int b)
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{
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# ifdef _X86_
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_asm // Use bit test and set instruction
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{
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mov eax, plock
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lock bts [eax], 0x0
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jc bsy // If already set go to busy, otherwise return TRUE
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} ;
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#else
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if (InterlockedExchange(plock, 1) == 0)
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#endif
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{
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return(TRUE);
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}
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bsy:
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return(get_spinlockfn(plock, b, c));
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}
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