用多线程解决生产者消费者问题，每当生产者生产物品，存入仓库，消费者从仓库消费，当仓库满时候，停止生产，仓库为空时，消费者停止消费-Producers and consumers with multiple threads to solve the problem, when producers produce goods into the warehouse, consumer spending from the warehouse when the warehouse is full time, to stop production, warehouse is empty, consumers stop spending