C++ (Cpp) heap_create_alloc_class_buckets примеры использования

Пример #1

Файл: heap.c Проект: tomaszkapela/nvml

/*
 * heap_buckets_init -- (internal) initializes bucket instances
 */
int
heap_buckets_init(struct palloc_heap *heap)
{
	struct heap_rt *h = heap->rt;

	for (uint8_t i = 0; i < MAX_ALLOCATION_CLASSES; ++i) {
		struct alloc_class *c = alloc_class_by_id(h->alloc_classes, i);
		if (c != NULL) {
			if (heap_create_alloc_class_buckets(heap, c) != 0)
				goto error_bucket_create;
		}
	}

	h->default_bucket = bucket_new(container_new_ctree(heap),
		alloc_class_by_id(h->alloc_classes, DEFAULT_ALLOC_CLASS_ID));

	if (h->default_bucket == NULL)
		goto error_bucket_create;

	heap_populate_buckets(heap);

	return 0;

error_bucket_create:
	for (unsigned i = 0; i < h->ncaches; ++i)
		bucket_group_destroy(h->caches[i].buckets);

	return -1;
}

Пример #2

Файл: pmalloc.c Проект: lplewa/nvml

/*
 * CTL_WRITE_HANDLER(proto) -- creates a new allocation class
 */
static int
CTL_WRITE_HANDLER(desc)(void *ctx,
	enum ctl_query_source source, void *arg, struct ctl_indexes *indexes)
{
	PMEMobjpool *pop = ctx;
	uint8_t id;
	struct alloc_class_collection *ac = heap_alloc_classes(&pop->heap);
	struct pobj_alloc_class_desc *p = arg;

	if (p->unit_size <= 0 || p->unit_size > PMEMOBJ_MAX_ALLOC_SIZE ||
		p->units_per_block <= 0) {
		errno = EINVAL;
		return -1;
	}

	if (p->alignment != 0 && p->unit_size % p->alignment != 0) {
		ERR("unit size must be evenly divisible by alignment");
		errno = EINVAL;
		return -1;
	}

	if (p->alignment > (MEGABYTE * 2)) {
		ERR("alignment cannot be larger than 2 megabytes");
		errno = EINVAL;
		return -1;
	}

	enum header_type lib_htype = MAX_HEADER_TYPES;
	switch (p->header_type) {
		case POBJ_HEADER_LEGACY:
			lib_htype = HEADER_LEGACY;
			break;
		case POBJ_HEADER_COMPACT:
			lib_htype = HEADER_COMPACT;
			break;
		case POBJ_HEADER_NONE:
			lib_htype = HEADER_NONE;
			break;
		case MAX_POBJ_HEADER_TYPES:
		default:
			ERR("invalid header type");
			errno = EINVAL;
			return -1;
	}

	if (SLIST_EMPTY(indexes)) {
		if (alloc_class_find_first_free_slot(ac, &id) != 0) {
			ERR("no available free allocation class identifier");
			errno = EINVAL;
			return -1;
		}
	} else {
		struct ctl_index *idx = SLIST_FIRST(indexes);
		ASSERTeq(strcmp(idx->name, "class_id"), 0);

		if (idx->value < 0 || idx->value >= MAX_ALLOCATION_CLASSES) {
			ERR("class id outside of the allowed range");
			errno = ERANGE;
			return -1;
		}

		id = (uint8_t)idx->value;

		if (alloc_class_reserve(ac, id) != 0) {
			ERR("attempted to overwrite an allocation class");
			errno = EEXIST;
			return -1;
		}
	}

	size_t runsize_bytes =
		CHUNK_ALIGN_UP((p->units_per_block * p->unit_size) +
		RUN_BASE_METADATA_SIZE);

	/* aligning the buffer might require up-to to 'alignment' bytes */
	if (p->alignment != 0)
		runsize_bytes += p->alignment;

	uint32_t size_idx = (uint32_t)(runsize_bytes / CHUNKSIZE);
	if (size_idx > UINT16_MAX)
		size_idx = UINT16_MAX;

	struct alloc_class *c = alloc_class_new(id,
		heap_alloc_classes(&pop->heap), CLASS_RUN,
		lib_htype, p->unit_size, p->alignment, size_idx);
	if (c == NULL) {
		errno = EINVAL;
		return -1;
	}

	if (heap_create_alloc_class_buckets(&pop->heap, c) != 0) {
		alloc_class_delete(ac, c);
		return -1;
	}

	p->class_id = c->id;
	p->units_per_block = c->run.nallocs;

	return 0;
}