sem.h,v

来自「TCP-IP红宝书源代码」· H,V 代码 · 共 57 行

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date	97.09.21.19.26.19;	author dls;	state Dist;
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date	94.05.10.20.48.46;	author dls;	state Old;
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@pre-3e code
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@/* sem.h - isbadsem */

#ifndef	NSEM
#define	NSEM		50	/* number of semaphores, if not defined	*/
#endif

#define	SFREE	'\01'		/* this semaphore is free		*/
#define	SUSED	'\02'		/* this semaphore is used		*/

struct	sentry	{		/* semaphore table entry		*/
	char	sstate;		/* the state SFREE or SUSED		*/
	int	semcnt;		/* count for this semaphore		*/
	int	sqhead;		/* q index of head of list		*/
	int	sqtail;		/* q index of tail of list		*/
};
extern	struct	sentry	semaph[];
extern	int	nextsem;

#define	isbadsem(s)	(s<0 || s>=NSEM)
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@Initial revision
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