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Annotation of xinu/sys/send.c, revision 1.1.1.2

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;
1.1.1.2 ! root       13: WORD   msg;
1.1       root       14: {
1.1.1.2 ! root       15:        struct  pentry  *pptr;
1.1       root       16: 
1.1.1.2 ! root       17:        disable();
1.1       root       18:        if (isbadpid(pid) || ( (pptr= &proctab[pid])->pstate == PRFREE)
1.1.1.2 ! root       19:           || pptr->phasmsg != 0) {
        !            20:                restore();
1.1       root       21:                return(SYSERR);
                     22:        }
1.1.1.2 ! root       23:        pptr->pmsg = msg;
        !            24:        pptr->phasmsg++;
        !            25:        if (pptr->pstate == PRRECV)
1.1       root       26:                ready(pid, RESCHYES);
                     27:        return(OK);
                     28: }

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