Why IOCP is used?

I am trying to understand why IOCP is used. I can think of two reasons:

  • Since WSARecv() will not block, then I can handle 1000s of clients without having to create a new thread for each client (also, there is a limit on how many threads you can create, and so the number of clients you can handle will be limited).
  • Since WSASend() will not block, then when I want to send a large file, I don’t have to create a new thread to send it (if I did not create a new thread then the UI thread will block of course).

What other reasons are there to use IOCP?

Source: c#

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