ObjFW  Diff

			of_list_object_t *listObject;

			if (_terminate) {
				objc_autoreleasePoolPop(pool);
				return nil;
			}

			listObject = [_queue firstListObject];

			while (listObject == NULL) {
				[_queueCondition wait];

				if (_terminate) {
					objc_autoreleasePoolPop(pool);
					return nil;
				}

				listObject = [_queue firstListObject];
			}

			job = [[listObject->object retain] autorelease];
			[_queue removeListObject: listObject];
		} @finally {
			[_queueCondition unlock];
		}