libc/stdlib/malloc.c

766 	 * recently freed chunk.  The spare is left in the arena's chunk trees
769 	 * There is one spare chunk per arena, rather than one spare total, in
771 	 * a single spare inadequate.
773 	arena_chunk_t		*spare;
2736 	if (arena->spare != NULL) {
2737 		chunk = arena->spare;
2738 		arena->spare = NULL;
2785 	if (arena->spare != NULL) {
2786 		if (arena->spare->dirtied) {
2788 			    &chunk->arena->chunks_dirty, arena->spare);
2789 			arena->ndirty -= arena->spare->ndirty;
2791 		chunk_dealloc((void *)arena->spare, chunksize);
2806 	arena->spare = chunk;
3035 	 * deallocated above, since in that case it is the spare.  Waiting
3037 	 * allows for an old spare to be fully deallocated, thus decreasing the
3144 		/* The last element has spare bits that need to be unset. */
4615 	arena->spare = NULL;