Method getFor

deps/concurrentqueue/concurrentqueue.h:3114–3188

			
		private:
			static MemStats getFor(ConcurrentQueue* q)
			{
				MemStats stats = { 0 };
				
				stats.elementsEnqueued = q->size_approx();
			
				auto block = q->freeList.head_unsafe();
				while (block != nullptr) {
					++stats.allocatedBlocks;
					++stats.freeBlocks;
					block = block->freeListNext.load(std::memory_order_relaxed);
				}
				
				for (auto ptr = q->producerListTail.load(std::memory_order_acquire); ptr != nullptr; ptr = ptr->next_prod()) {
					bool implicit = dynamic_cast<ImplicitProducer*>(ptr) != nullptr;
					stats.implicitProducers += implicit ? 1 : 0;
					stats.explicitProducers += implicit ? 0 : 1;
					
					if (implicit) {
						auto prod = static_cast<ImplicitProducer*>(ptr);
						stats.queueClassBytes += sizeof(ImplicitProducer);
						auto head = prod->headIndex.load(std::memory_order_relaxed);
						auto tail = prod->tailIndex.load(std::memory_order_relaxed);
						auto hash = prod->blockIndex.load(std::memory_order_relaxed);
						if (hash != nullptr) {
							for (size_t i = 0; i != hash->capacity; ++i) {
								if (hash->index[i]->key.load(std::memory_order_relaxed) != ImplicitProducer::INVALID_BLOCK_BASE && hash->index[i]->value.load(std::memory_order_relaxed) != nullptr) {
									++stats.allocatedBlocks;
									++stats.ownedBlocksImplicit;
								}
							}
							stats.implicitBlockIndexBytes += hash->capacity * sizeof(typename ImplicitProducer::BlockIndexEntry);
							for (; hash != nullptr; hash = hash->prev) {
								stats.implicitBlockIndexBytes += sizeof(typename ImplicitProducer::BlockIndexHeader) + hash->capacity * sizeof(typename ImplicitProducer::BlockIndexEntry*);
							}
						}
						for (; details::circular_less_than<index_t>(head, tail); head += BLOCK_SIZE) {
							//auto block = prod->get_block_index_entry_for_index(head);
							++stats.usedBlocks;
						}
					}
					else {
						auto prod = static_cast<ExplicitProducer*>(ptr);
						stats.queueClassBytes += sizeof(ExplicitProducer);
						auto tailBlock = prod->tailBlock;
						bool wasNonEmpty = false;
						if (tailBlock != nullptr) {
							auto block = tailBlock;
							do {
								++stats.allocatedBlocks;
								if (!block->ConcurrentQueue::Block::template is_empty<explicit_context>() || wasNonEmpty) {
									++stats.usedBlocks;
									wasNonEmpty = wasNonEmpty || block != tailBlock;
								}
								++stats.ownedBlocksExplicit;
								block = block->next;
							} while (block != tailBlock);
						}