INUSE_BITS        459 lj_alloc.c     #define FENCEPOST_HEAD		(INUSE_BITS|SIZE_T_SIZE)
INUSE_BITS        464 lj_alloc.c     #define chunksize(p)		((p)->head & ~(INUSE_BITS))
INUSE_BITS        474 lj_alloc.c     #define next_chunk(p)	((mchunkptr)(((char *)(p)) + ((p)->head & ~INUSE_BITS)))
INUSE_BITS       1377 lj_alloc.c     	} else if ((next->head & INUSE_BITS) == INUSE_BITS) {