Exemple #1
0
void
hash_create_mutexes(
/*================*/
	hash_table_t*	table,		/* in: hash table */
	ulint		n_mutexes,	/* in: number of mutexes, must be a
					power of 2 */
	ulint		sync_level)	/* in: latching order level of the
					mutexes: used in the debug version */
{
	ulint	i;

	ut_a(n_mutexes == ut_2_power_up(n_mutexes));

	table->mutexes = mem_alloc(n_mutexes * sizeof(mutex_t));

	for (i = 0; i < n_mutexes; i++) {
		mutex_create(table->mutexes + i);

		mutex_set_level(table->mutexes + i, sync_level);
	}

	table->n_mutexes = n_mutexes;
}
Exemple #2
0
void
mem_area_free(
/*==========*/
	void*		ptr,	/* in, own: pointer to allocated memory
				buffer */
	mem_pool_t*	pool)	/* in: memory pool */
{
	mem_area_t*	area;
	mem_area_t*	buddy;
	void*		new_ptr;
	ulint		size;
	ulint		n;

	/* It may be that the area was really allocated from the OS with
	regular malloc: check if ptr points within our memory pool */

	if ((byte*)ptr < pool->buf || (byte*)ptr >= pool->buf + pool->size) {
		ut_free(ptr);

		return;
	}

	area = (mem_area_t*) (((byte*)ptr) - MEM_AREA_EXTRA_SIZE);

	if (mem_area_get_free(area)) {
		fprintf(stderr,
			"InnoDB: Error: Freeing element to mem pool"
			" free list though the\n"
			"InnoDB: element is marked free!\n");

		mem_analyze_corruption(area);
		ut_error;
	}

	size = mem_area_get_size(area);
	UNIV_MEM_FREE(ptr, size - MEM_AREA_EXTRA_SIZE);

	if (size == 0) {
		fprintf(stderr,
			"InnoDB: Error: Mem area size is 0. Possibly a"
			" memory overrun of the\n"
			"InnoDB: previous allocated area!\n");

		mem_analyze_corruption(area);
		ut_error;
	}

#ifdef UNIV_LIGHT_MEM_DEBUG
	if (((byte*)area) + size < pool->buf + pool->size) {

		ulint	next_size;

		next_size = mem_area_get_size(
			(mem_area_t*)(((byte*)area) + size));
		if (ut_2_power_up(next_size) != next_size) {
			fprintf(stderr,
				"InnoDB: Error: Memory area size %lu,"
				" next area size %lu not a power of 2!\n"
				"InnoDB: Possibly a memory overrun of"
				" the buffer being freed here.\n",
				(ulong) size, (ulong) next_size);
			mem_analyze_corruption(area);

			ut_error;
		}
	}
#endif
	buddy = mem_area_get_buddy(area, size, pool);

	n = ut_2_log(size);

	mutex_enter(&(pool->mutex));
	mem_n_threads_inside++;

	ut_a(mem_n_threads_inside == 1);

	if (buddy && mem_area_get_free(buddy)
	    && (size == mem_area_get_size(buddy))) {

		/* The buddy is in a free list */

		if ((byte*)buddy < (byte*)area) {
			new_ptr = ((byte*)buddy) + MEM_AREA_EXTRA_SIZE;

			mem_area_set_size(buddy, 2 * size);
			mem_area_set_free(buddy, FALSE);
		} else {
			new_ptr = ptr;

			mem_area_set_size(area, 2 * size);
		}

		/* Remove the buddy from its free list and merge it to area */

		UT_LIST_REMOVE(free_list, pool->free_list[n], buddy);

		pool->reserved += ut_2_exp(n);

		mem_n_threads_inside--;
		mutex_exit(&(pool->mutex));

		mem_area_free(new_ptr, pool);

		return;
	} else {
		UT_LIST_ADD_FIRST(free_list, pool->free_list[n], area);

		mem_area_set_free(area, TRUE);

		ut_ad(pool->reserved >= size);

		pool->reserved -= size;
	}

	mem_n_threads_inside--;
	mutex_exit(&(pool->mutex));

	ut_ad(mem_pool_validate(pool));
}