/* newqueue.c - newqueue */

#include 

/*------------------------------------------------------------------------
 *  newqueue  -  Allocate and initialize a queue in the global queue table
 *------------------------------------------------------------------------
 */
qid16   newqueue(void)
{
        static qid16    nextqid=NPROC;  /* Next list in queuetab to use */
        qid16           q;              /* ID of allocated queue        */

        q = nextqid;
        if (q >= NQENT) {               /* Check for table overflow     */
                return SYSERR;
        }

        nextqid += 2;                   /* Increment index for next call*/

        /* Initialize head and tail nodes to form an empty queue */

        queuetab[queuehead(q)].qnext = queuetail(q);
        queuetab[queuehead(q)].qprev = EMPTY;
        queuetab[queuehead(q)].qkey  = MAXKEY;
        queuetab[queuetail(q)].qnext = EMPTY;
        queuetab[queuetail(q)].qprev = queuehead(q);
        queuetab[queuetail(q)].qkey  = MINKEY;
        return q;
}