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

1.1     ! root        1: /* newqueue.c  -  newqueue */
        !             2: 
        !             3: #include <conf.h>
        !             4: #include <kernel.h>
        !             5: #include <q.h>
        !             6: 
        !             7: /*------------------------------------------------------------------------
        !             8:  * newqueue  --  initialize a new list in the q structure
        !             9:  *------------------------------------------------------------------------
        !            10:  */
        !            11: int    newqueue()
        !            12: {
        !            13:        struct  qent    *hptr;          /* address of new list head     */
        !            14:        struct  qent    *tptr;          /* address of new list tail     */
        !            15:        int     hindex, tindex;         /* head and tail indexes        */
        !            16: 
        !            17:        hptr = &q[ hindex=nextqueue++ ];/* nextqueue is global variable */
        !            18:        tptr = &q[ tindex=nextqueue++ ];/*  giving next used q pos.     */
        !            19:        hptr->qnext = tindex;
        !            20:        hptr->qprev = EMPTY;
        !            21:        hptr->qkey  = MINSHORT;
        !            22:        tptr->qnext = EMPTY;
        !            23:        tptr->qprev = hindex;
        !            24:        tptr->qkey  = MAXSHORT;
        !            25:        return(hindex);
        !            26: }

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