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

1.1     ! root        1: /* insertd.c - insertd */
        !             2: 
        !             3: #include <conf.h>
        !             4: #include <kernel.h>
        !             5: #include <q.h>
        !             6: 
        !             7: /*------------------------------------------------------------------------
        !             8:  *  insertd  --  insert process pid in delta list "head", given its key
        !             9:  *------------------------------------------------------------------------
        !            10:  */
        !            11: insertd(pid, head, key)
        !            12:        int     pid;
        !            13:        int     head;
        !            14:        int     key;
        !            15: {
        !            16: 
        !            17:        int     next;                   /* runs through list            */
        !            18:        int     prev;                   /* follows next through list    */
        !            19: 
        !            20:        if (key < 0 || key > MAXSHORT)
        !            21:                return (SYSERR);
        !            22: 
        !            23:        for(prev=head,next=q[head].qnext ;
        !            24:            q[next].qkey < key ; prev=next,next=q[next].qnext)
        !            25:                key -= q[next].qkey;
        !            26:        q[pid].qnext = next;
        !            27:        q[pid].qprev = prev;
        !            28:        q[pid].qkey  = key;
        !            29:        q[prev].qnext = pid;
        !            30:        q[next].qprev = pid;
        !            31:        if (next < NPROC)
        !            32:                q[next].qkey -= key;
        !            33:        return(OK);
        !            34: }

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