sleep10.c

来自「TCP-IP红宝书源代码」· C语言 代码 · 共 32 行

/* sleep10.c - sleep10 */

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

/*------------------------------------------------------------------------
 * sleep10  --  delay the caller for a time specified in tenths of seconds
 *------------------------------------------------------------------------
 */
SYSCALL	sleep10(n)
	int n;
{
	STATWORD ps;    
	if (n < 0  || clkruns==0)
	         return(SYSERR);
	disable(ps);
	if (n == 0) {		/* sleep10(0) -> end time slice */
	        ;
	} else {
		insertd(currpid,clockq,n*10);
		slnempty = TRUE;
		sltop = &q[q[clockq].qnext].qkey;
		proctab[currpid].pstate = PRSLEEP;
	}
	resched();
        restore(ps);
	return(OK);
}