/* ptcreate.c - ptcreate */

#include 

/*------------------------------------------------------------------------
 *  ptcreate  -  Create a port that allows "count" outstanding messages
 *------------------------------------------------------------------------
 */
syscall ptcreate(
          int32         count           /* Size of port                 */
        )
{
        intmask mask;                   /* Saved interrupt mask         */
        int32   i;                      /* Counts all possible ports    */
        int32   ptnum;                  /* Candidate port number to try */
        struct  ptentry *ptptr;         /* Pointer to port table entry  */

        mask = disable();
        if (count < 0) {
                restore(mask);
                return SYSERR;
        }

        for (i=0 ; i= NPORTS) {
                        ptnextid = 0;   /* Reset for next iteration     */
                }

                /* Check table entry that corresponds to ID ptnum */

                ptptr= &porttab[ptnum];
                if (ptptr->ptstate == PT_FREE) {
                        ptptr->ptstate = PT_ALLOC;
                        ptptr->ptssem = semcreate(count);
                        ptptr->ptrsem = semcreate(0);
                        ptptr->pthead = ptptr->pttail = NULL;
                        ptptr->ptseq++;
                        ptptr->ptmaxcnt = count;
                        restore(mask);
                        return ptnum;
                }
        }
        restore(mask);
        return SYSERR;
}