Threaded programs also run into a few problems that are not normally seen with multiple processes and IPC.
线程程序有时会出现在多进程和 IPC 程序设计中不常出现的一些问题。
Dequeuing is single threaded, even if the message flow itself is configured for multiple instances.
退出队列是一个单线程操作，即使消息流本身配置为多实例时也是如此。
A newer, threaded, model is called worker, which USES multiple processes, each with multiple threads to get better performance with lower overhead.
较新的线程化模型称为worker，它使用多个进程，每个进程又有多个线程，这样就能以较低的开销获得更好的性能。
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