getprio.c,v

来自「TCP-IP红宝书源代码」· C,V 代码 · 共 49 行

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date	97.09.21.19.29.30;	author dls;	state Dist;
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@/* getprio.c - getprio */

#include <conf.h>
#include <kernel.h>
#include <proc.h>

/*------------------------------------------------------------------------
 * getprio -- return the scheduling priority of a given process
 *------------------------------------------------------------------------
 */
SYSCALL getprio(pid)
	int	pid;
{
	STATWORD ps;    
	struct	pentry	*pptr;

	disable(ps);
	if (isbadpid(pid) || (pptr = &proctab[pid])->pstate == PRFREE) {
		restore(ps);
		return(SYSERR);
	}
	restore(ps);
	return(pptr->pprio);
}
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