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Annotation of xinu/sys/send.c, revision 1.1

1.1     ! root        1: /* send.c - send */
        !             2: 
        !             3: #include <conf.h>
        !             4: #include <kernel.h>
        !             5: #include <proc.h>
        !             6: 
        !             7: /*------------------------------------------------------------------------
        !             8:  *  send  --  send a message to another process
        !             9:  *------------------------------------------------------------------------
        !            10:  */
        !            11: SYSCALL        send(pid, msg)
        !            12: int    pid;
        !            13: int    msg;
        !            14: {
        !            15:        struct  pentry  *pptr;          /* receiver's proc. table addr. */
        !            16:        PStype  ps;
        !            17: 
        !            18:        disable(ps);
        !            19:        if (isbadpid(pid) || ( (pptr= &proctab[pid])->pstate == PRFREE)
        !            20:           || pptr->phasmsg) {
        !            21:                restore(ps);
        !            22:                return(SYSERR);
        !            23:        }
        !            24:        pptr->pmsg = msg;               /* deposit message              */
        !            25:        pptr->phasmsg = TRUE;
        !            26:        if (pptr->pstate == PRRECV)     /* if receiver waits, start it  */
        !            27:                ready(pid, RESCHYES);
        !            28:        else if (pptr->pstate == PRTRECV) {
        !            29:                unsleep(pid);
        !            30:                ready(pid, RESCHYES);
        !            31:        }
        !            32:        restore(ps);
        !            33:        return(OK);
        !            34: }

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