Function add_producer

deps/concurrentqueue/concurrentqueue.h:3232–3263

	}
	
	ProducerBase* add_producer(ProducerBase* producer)
	{
		// Handle failed memory allocation
		if (producer == nullptr) {
			return nullptr;
		}
		
		producerCount.fetch_add(1, std::memory_order_relaxed);
		
		// Add it to the lock-free list
		auto prevTail = producerListTail.load(std::memory_order_relaxed);
		do {
			producer->next = prevTail;
		} while (!producerListTail.compare_exchange_weak(prevTail, producer, std::memory_order_release, std::memory_order_relaxed));
		
#ifdef MOODYCAMEL_QUEUE_INTERNAL_DEBUG
		if (producer->isExplicit) {
			auto prevTailExplicit = explicitProducers.load(std::memory_order_relaxed);
			do {
				static_cast<ExplicitProducer*>(producer)->nextExplicitProducer = prevTailExplicit;
			} while (!explicitProducers.compare_exchange_weak(prevTailExplicit, static_cast<ExplicitProducer*>(producer), std::memory_order_release, std::memory_order_relaxed));
		}
		else {
			auto prevTailImplicit = implicitProducers.load(std::memory_order_relaxed);
			do {
				static_cast<ImplicitProducer*>(producer)->nextImplicitProducer = prevTailImplicit;
			} while (!implicitProducers.compare_exchange_weak(prevTailImplicit, static_cast<ImplicitProducer*>(producer), std::memory_order_release, std::memory_order_relaxed));
		}
#endif
		
		return producer;
	}
	
	void reown_producers()
	{