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Editorial Team
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Asked: 2026-05-20T23:03:32+00:00

From http://msdn.microsoft.com/en-us/library/bbx2eya8.aspx it looks like, that this type of sockets are using more than

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From http://msdn.microsoft.com/en-us/library/bbx2eya8.aspx it looks like, that this type of sockets are using more than one thread, but from what i am thinking Asynchronous Sockets can and should run in single thread (or least limited number of threads) , since they are just callbacks from state machine which works like smart scheduler.

My question is: Does asynchronous sockets spawns as many threads as there are connections or is there some upper bound of how many threads are spawned, no matter how many connections application handles.

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  1. Editorial Team

    Yes and no. All the real work is done by the TCP/IP driver stack. Which has no trouble handling multiple incomplete IRP requests. When one of them completes, an APC is fired on a threadpool thread which in turn ends up calling your completion callback. The underlying operating system object is called an “I/O completion port”, you can read more about it in this SDK article.

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