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

1.1     ! root        1: /* unsleep.c - unsleep */
        !             2: 
        !             3: #include <conf.h>
        !             4: #include <kernel.h>
        !             5: #include <proc.h>
        !             6: #include <q.h>
        !             7: #include <sleep.h>
        !             8: 
        !             9: /*------------------------------------------------------------------------
        !            10:  * unsleep  --  remove  process from the sleep queue prematurely
        !            11:  *------------------------------------------------------------------------
        !            12:  */
        !            13: SYSCALL        unsleep(pid)
        !            14:        int     pid;
        !            15: {
        !            16:        struct  pentry  *pptr;
        !            17:        struct  qent    *qptr;
        !            18:        int     remain;
        !            19:        int     next;
        !            20:        PStype  ps;
        !            21: 
        !            22:         disable(ps);
        !            23:        if (isbadpid(pid) ||
        !            24:            ( (pptr = &proctab[pid])->pstate != PRSLEEP &&
        !            25:             pptr->pstate != PRTRECV) ) {
        !            26:                restore(ps);
        !            27:                return(SYSERR);
        !            28:        }
        !            29:        qptr = &q[pid];
        !            30:        remain = qptr->qkey;
        !            31:        if ( (next=qptr->qnext) < NPROC)
        !            32:                q[next].qkey += remain;
        !            33:        dequeue(pid);
        !            34:        if ( (next=q[clockq].qnext) < NPROC)
        !            35:                sltop = (short *) & q[next].qkey;
        !            36:        else
        !            37:                slnempty = FALSE;
        !            38:         restore(ps);
        !            39:        return(OK);
        !            40: }

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