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

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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