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

1.1     ! root        1: /* getbuf.c - getbuf */
        !             2: 
        !             3: #include <conf.h>
        !             4: #include <kernel.h>
        !             5: #include <mark.h>
        !             6: #include <bufpool.h>
        !             7: 
        !             8: /*------------------------------------------------------------------------
        !             9:  *  getbuf  --  get a buffer from a preestablished buffer pool
        !            10:  *------------------------------------------------------------------------
        !            11:  */
        !            12: SYSCALL        *getbuf(poolid)
        !            13: int poolid;
        !            14: {
        !            15:        PStype  ps;
        !            16:        int     *buf;
        !            17: 
        !            18: #ifdef MEMMARK
        !            19:        if ( unmarked(bpmark) )
        !            20:                return((int *)SYSERR);
        !            21: #endif
        !            22:        if (poolid<0 || poolid>=nbpools)
        !            23:                return((int *)SYSERR);
        !            24:        wait(bptab[poolid].bpsem);
        !            25:        disable(ps);
        !            26:        buf = (int *)bptab[poolid].bpnext;
        !            27:        bptab[poolid].bpnext = (char *)*buf;
        !            28:        restore(ps);
        !            29:        *buf++ = poolid;
        !            30:        return(buf);
        !            31: }

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