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

1.1       root        1: /* receive.c - receive */
                      2: 
                      3: #include <conf.h>
                      4: #include <kernel.h>
                      5: #include <proc.h>
                      6: 
                      7: /*------------------------------------------------------------------------
                      8:  *  receive  -  wait for a message and return it
                      9:  *------------------------------------------------------------------------
                     10:  */
                     11: SYSCALL        receive()
                     12: {
                     13:        struct  pentry  *pptr;
                     14:        int     msg;
                     15:        PStype  ps;
                     16: 
                     17:        disable(ps);
                     18:        pptr = &proctab[currpid];
                     19:        if ( !pptr->phasmsg ) {         /* if no message, wait for one  */
                     20:                pptr->pstate = PRRECV;
                     21:                resched();
                     22:        }
                     23:        msg = pptr->pmsg;               /* retrieve message             */
                     24:        pptr->phasmsg = FALSE;
                     25:        restore(ps);
                     26:        return(msg);
                     27: }

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