sleep.c

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/* sleep.c - sleep sleepms */

#include <xinu.h>

#define MAXSECONDS  2147483     /* Max seconds per 32-bit msec  */

/*------------------------------------------------------------------------
 *  sleep  -  Delay the calling process n seconds
 *------------------------------------------------------------------------
 */
syscall sleep(
      int32 delay       /* Time to delay in seconds */
    )
{
    if ( (delay < 0) || (delay > MAXSECONDS) ) {
        return SYSERR;
    }
    sleepms(1000*delay);
    return OK;
}

/*------------------------------------------------------------------------
 *  sleepms  -  Delay the calling process n milliseconds
 *------------------------------------------------------------------------
 */
syscall sleepms(
      int32 delay           /* Time to delay in msec.   */
    )
{
    intmask mask;           /* Saved interrupt mask     */

    if (delay < 0) {
        return SYSERR;
    }

    if (delay == 0) {
        yield();
        return OK;
    }

    /* Delay calling process */

    mask = disable();
    if (insertd(currpid, sleepq, delay) == SYSERR) {
        restore(mask);
        return SYSERR;
    }

    proctab[currpid].prstate = PR_SLEEP;
    resched();
    restore(mask);
    return OK;
}