C++ (Cpp) ReturnSlab Examples

Example #1

File: ObjectCache.cpp Project: mariuz/haiku

void
ObjectCache::ReturnObjectToSlab(slab* source, void* object, uint32 flags)
{
	if (source == NULL) {
		panic("object_cache: free'd object has no slab");
		return;
	}

	ParanoiaChecker _(source);
	uint8* data = (uint8*) object;
	if (data < source->pages
		|| data >= (uint8*) source->pages + source->size * object_size) {
		panic("object_cache: free'd object does not belong to slab");
	}

	intptr_t objectOffset = data - source->offset - (uint8*) source->pages;
	if (objectOffset % object_size != 0) {
		panic("object_cache: returning a wrong pointer to a slab object");
	}

	object_link* link = object_to_link(object, object_size);

	TRACE_CACHE(this, "returning %p (%p) to %p, %lu used (%lu empty slabs).",
		object, link, source, source->size - source->count,
		empty_count);

	_push(source->free, link);
	source->count++;
	used_count--;

	ADD_PARANOIA_CHECK(PARANOIA_SUSPICIOUS, source, &link->next, sizeof(void*));

	if (source->count == source->size) {
		partial.Remove(source);

		if (empty_count < pressure
			&& total_objects - used_count - source->size
				>= min_object_reserve) {
			empty_count++;
			empty.Add(source);
		} else {
			ReturnSlab(source, flags);
		}
	} else if (source->count == 1) {
		full.Remove(source);
		partial.Add(source);
	}
}

Example #2

File: ObjectCache.cpp Project: mmanley/Antares

void
ObjectCache::ReturnObjectToSlab(slab* source, void* object, uint32 flags)
{
	if (source == NULL) {
		panic("object_cache: free'd object has no slab");
		return;
	}

	ParanoiaChecker _(source);

	object_link* link = object_to_link(object, object_size);

	TRACE_CACHE(this, "returning %p (%p) to %p, %lu used (%lu empty slabs).",
		object, link, source, source->size - source->count,
		empty_count);

	_push(source->free, link);
	source->count++;
	used_count--;

	ADD_PARANOIA_CHECK(PARANOIA_SUSPICIOUS, source, &link->next, sizeof(void*));

	if (source->count == source->size) {
		partial.Remove(source);

		if (empty_count < pressure
			&& total_objects - used_count - source->size
				>= min_object_reserve) {
			empty_count++;
			empty.Add(source);
		} else {
			ReturnSlab(source, flags);
		}
	} else if (source->count == 1) {
		full.Remove(source);
		partial.Add(source);
	}
}