/* unsleep.c - unsleep */

#include 

/*------------------------------------------------------------------------
 *  unsleep  -  Internal function to remove a process from the sleep
 *                  queue prematurely.  The caller must adjust the delay
 *                  of successive processes.
 *------------------------------------------------------------------------
 */
status  unsleep(
          pid32         pid             /* ID of process to remove      */
        )
{
        intmask mask;                   /* Saved interrupt mask         */
        struct  procent *prptr;         /* Ptr to process's table entry */

        pid32   pidnext;                /* ID of process on sleep queue */
                                        /*   that follows the process   */
                                        /*   which is being removed     */

        mask = disable();

        if (isbadpid(pid)) {
                restore(mask);
                return SYSERR;
        }

        /* Verify that candidate process is on the sleep queue */

        prptr = &proctab[pid];
        if ((prptr->prstate!=PR_SLEEP) && (prptr->prstate!=PR_RECTIM)) {
                restore(mask);
                return SYSERR;
        }

        /* Increment delay of next process if such a process exists */

        pidnext = queuetab[pid].qnext;
        if (pidnext < NPROC) {
                queuetab[pidnext].qkey += queuetab[pid].qkey;
        }

        getitem(pid);                   /* Unlink process from queue */
        restore(mask);
        return OK;
}