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Annotation of xinu/sys/recvtim.c, revision 1.1.1.1

1.1       root        1: /* recvtim.c - recvtim */
                      2: 
                      3: #include <conf.h>
                      4: #include <kernel.h>
                      5: #include <proc.h>
                      6: #include <q.h>
                      7: #include <sleep.h>
                      8: 
                      9: /*------------------------------------------------------------------------
                     10:  *  recvtim  -  wait to receive a message or timeout and return result
                     11:  *------------------------------------------------------------------------
                     12:  */
                     13: SYSCALL        recvtim(maxwait)
                     14:        int     maxwait;
                     15: {
                     16:        struct  pentry  *pptr;
                     17:        int     msg;
                     18:        PStype  ps;
                     19: 
                     20:        if (maxwait<0 || clkruns == 0)
                     21:                return(SYSERR);
                     22:        disable(ps);
                     23:        pptr = &proctab[currpid];
                     24:        if ( !pptr->phasmsg ) {         /* if no message, wait          */
                     25:                insertd(currpid, clockq, maxwait);
                     26:                slnempty = TRUE;
                     27:                sltop = (short *)&q[q[clockq].qnext].qkey;
                     28:                pptr->pstate = PRTRECV;
                     29:                resched();
                     30:        }
                     31:        if ( pptr->phasmsg ) {
                     32:                msg = pptr->pmsg;       /* msg. arrived => retrieve it  */
                     33:                pptr->phasmsg = FALSE;
                     34:        } else {                        /* still no message => TIMEOUT  */
                     35:                msg = TIMEOUT;
                     36:        }
                     37:        restore(ps);
                     38:        return(msg);
                     39: }

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