Thanks a lot for all your help.

But won't using 200 processes or thread be too resource consumable comparing to use select or poll?

If it would considerable low down the performance of the program, it would be unacceptable. My program will running on a linux server.

By the way, I am using mysql. Does it provide asynchronous operation?

In reply to Re^2: a IO:SELECT problem by ablmf
in thread a IO:SELECT problem by ablmf

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