/* recvtime.c - recvtime */

#include 

/*------------------------------------------------------------------------
 *  recvtime  -  Wait specified time to receive a message and return
 *------------------------------------------------------------------------
 */
umsg32  recvtime(
          int32         maxwait         /* Ticks to wait before timeout */
        )
{
        intmask mask;                   /* Saved interrupt mask         */
        struct  procent *prptr;         /* Tbl entry of current process */
        umsg32  msg;                    /* Message to return            */

        if (maxwait < 0) {
                return SYSERR;
        }
        mask = disable();

        /* Schedule wakeup and place process in timed-receive state */

        prptr = &proctab[currpid];
        if (prptr->prhasmsg == FALSE) { /* Delay if no message waiting  */
                if (insertd(currpid,sleepq,maxwait) == SYSERR) {
                        restore(mask);
                        return SYSERR;
                }
                prptr->prstate = PR_RECTIM;
                resched();
        }

        /* Either message arrived or timer expired */

        if (prptr->prhasmsg) {
                msg = prptr->prmsg;     /* Retrieve message             */
                prptr->prhasmsg = FALSE;/* Reset message indicator      */
        } else {
                msg = TIMEOUT;
        }
        restore(mask);
        return msg;
}