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

1.1     ! root        1: /* pcount.c - pcount */
        !             2: 
        !             3: #include <conf.h>
        !             4: #include <kernel.h>
        !             5: #include <mark.h>
        !             6: #include <ports.h>
        !             7: 
        !             8: /*------------------------------------------------------------------------
        !             9:  *  pcount  --  return the count of current messages in a port
        !            10:  *------------------------------------------------------------------------
        !            11:  */
        !            12: SYSCALL        pcount(portid)
        !            13: int    portid;
        !            14: {
        !            15:        int     scnt;
        !            16:        int     count;
        !            17:        PStype  ps;
        !            18:        struct  pt      *ptptr;
        !            19: 
        !            20:        disable(ps);
        !            21:        if ( isbadport(portid) ||
        !            22: #ifdef MEMMARK
        !            23:                unmarked(ptmark) ||
        !            24: #endif
        !            25:                (ptptr= &ports[portid])->ptstate != PTALLOC ) {
        !            26:                        restore(ps);
        !            27:                        return(SYSERR);
        !            28:        }
        !            29:        count = scount(ptptr->ptrsem);
        !            30:        if ( (scnt=scount(ptptr->ptssem)) < 0 )
        !            31:                count -= scnt;                  /* add number waiting   */
        !            32:        restore(ps);
        !            33:        return(count);
        !            34: }

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