可连接的线程只有在被连接后 才释放线程资源。
The thread resources of the joinable thread are released only after it is joined.
在可连接状态中，另一个线程可以同步这个线程的终止，使用函数pthread_join来重新获得其终止代码。
In joinable state, another thread can synchronize on the thread's termination and recover its termination code using the function pthread_join .
这是一种异步服务 Web 请求的可扩展方式，无需在服务器上输入所有连接和线程资源。
This is a scalable way of servicing Web requests asynchronously without tying up all of the connection and thread resources on a server.
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