sleep100.c

来自「TCP-IP红宝书源代码」· C语言 代码 · 共 34 行

/* sleep100.c - sleep100 */

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

/*------------------------------------------------------------------------
 * sleep100  --  delay the caller for a time specified in 1/100 of seconds
 *------------------------------------------------------------------------
 */
SYSCALL
sleep100(n)
int	n;
{
	STATWORD ps;    

	if (n < 0  || clkruns==0)
	         return(SYSERR);
	disable(ps);
	if (n == 0) {		/* sleep100(0) -> end time slice */
	        ;
	} else {
		insertd(currpid,clockq,n);
		slnempty = TRUE;
		sltop = &q[q[clockq].qnext].qkey;
		proctab[currpid].pstate = PRSLEEP;
	}
	resched();
        restore(ps);
	return(OK);
}