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

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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