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Annotation of xinu/sys/getitem.c, revision 1.1.1.1

1.1       root        1: /* getitem.c - getfirst, getlast */
                      2: 
                      3: #include <conf.h>
                      4: #include <kernel.h>
                      5: #include <q.h>
                      6: 
                      7: /*------------------------------------------------------------------------
                      8:  * getfirst  --         remove and return the first process on a list
                      9:  *------------------------------------------------------------------------
                     10:  */
                     11: int    getfirst(head)
                     12:        int     head;                   /* q index of head of list      */
                     13: {
                     14:        int     proc;                   /* first process on the list    */
                     15: 
                     16:        if ((proc=q[head].qnext) < NPROC)
                     17:                return( dequeue(proc) );
                     18:        else
                     19:                return(EMPTY);
                     20: }
                     21: 
                     22: 
                     23: 
                     24: /*------------------------------------------------------------------------
                     25:  * getlast  --  remove and return the last process from a list
                     26:  *------------------------------------------------------------------------
                     27:  */
                     28: int    getlast(tail)
                     29:        int     tail;                   /* q index of tail of list      */
                     30: {
                     31:        int     proc;                   /* last process on the list     */
                     32: 
                     33:        if ((proc=q[tail].qprev) < NPROC)
                     34:                return( dequeue(proc) );
                     35:        else
                     36:                return(EMPTY);
                     37: }

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