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

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;
1.1.1.2 ! root       14:        WORD    msg;
1.1       root       15: 
1.1.1.2 ! root       16:        disable();
1.1       root       17:        pptr = &proctab[currpid];
1.1.1.2 ! root       18:        if (pptr->phasmsg == 0) {
1.1       root       19:                pptr->pstate = PRRECV;
                     20:                resched();
                     21:        }
1.1.1.2 ! root       22:        msg = pptr->pmsg;
        !            23:        pptr->phasmsg = 0;
        !            24:        restore();
1.1       root       25:        return(msg);
                     26: }

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