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

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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