accept系统调用是等待传入连接的阻塞调用。
The accept system call is a blocking call that waits for incoming connections.
用户表范围列决定是拒绝还是允许传入连接。
The user table scope columns determine whether to reject or permit incoming connections.
使用join不能解决此问题，因为join会始终等待所有传入连接。
Using a join does not solve the problem because the join always waits for all incoming connections.
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