resume.c

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#include <xinu.h>

pri16 resume(pid32 pid)
{
    intmask mask;          /* Saved interrupt mask      */
    struct procent *prptr; /* Ptr to process's table entry  */
    pri16 prio;            /* Priority to return        */

    mask = disable();
    if (isbadpid(pid))
    {
        restore(mask);
        return (pri16)SYSERR;
    }
    prptr = &proctab[pid];
    if (prptr->prstate != PR_SUSP)
    {
        restore(mask);
        return (pri16)SYSERR;
    }
    prio = prptr->prprio; /* Record priority to return  */
    ready(pid);
    restore(mask);
    return prio;
}