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Annotation of xinu/sys/resume.c, revision 1.1

1.1     ! root        1: /* resume.c - resume */
        !             2: 
        !             3: #include <conf.h>
        !             4: #include <kernel.h>
        !             5: #include <proc.h>
        !             6: 
        !             7: /*------------------------------------------------------------------------
        !             8:  * resume  --  unsuspend a process, making it ready; return the priority
        !             9:  *------------------------------------------------------------------------
        !            10:  */
        !            11: SYSCALL resume(pid)
        !            12:        int     pid;
        !            13: {
        !            14:        PStype  ps;                     /* saved processor status       */
        !            15:        struct  pentry  *pptr;          /* pointer to proc. tab. entry  */
        !            16:        int     prio;                   /* priority to return           */
        !            17: 
        !            18:        disable(ps);
        !            19:        if (isbadpid(pid) || (pptr = &proctab[pid])->pstate != PRSUSP) {
        !            20:                restore(ps);
        !            21:                return(SYSERR);
        !            22:        }
        !            23:        prio = pptr->pprio;
        !            24:        ready(pid, RESCHYES);
        !            25:        restore(ps);
        !            26:        return(prio);
        !            27: }

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