dynamic_pool::make_worker Multithreaded safe use may crash

[DeHby]

	void dynamic_pool::make_worker()
	{
		auto thread = std::thread{[this]() {
			while (true)
			{
				std::unique_lock<std::mutex> lock(m_queue_mu);
				m_cv.wait(lock, [this]() { return m_shutdown || !m_task_queue.empty() || m_idle_num > m_max_idle_size; });
				if (m_shutdown && m_task_queue.empty()) { return; } // Game over.
				if (m_idle_num > m_max_idle_size && !m_shutdown)
				{// Cut the idle threads.
					destroy_worker(std::this_thread::get_id());
					--m_idle_num;
					return;
				}
				--m_idle_num;
				auto task = std::move(m_task_queue.front());
				m_task_queue.pop();
				lock.unlock(); // LOCK IS OVER.
				task();
				++m_idle_num;  // ATOMIC
			}}};
		++m_idle_num;
		{
			std::lock_guard<std::mutex> lk(m_map_mu); // After this lock is added, the problem is solved
			m_workers[thread.get_id()] = std::move(thread);
		}
	}