Sunday, May 20, 2018

One of my favourite ways of multi-threading on Windows

Having blogged about a few bugs in multi-threading libraries recently, I want to show an easy and convenient alternative. It's minimalistic but it works.

On Windows, the I/O completion port offers a way to use a thread pool for your multi-threaded application. Designed primarily for efficient processing of asynchronous I/O, it supports files, named pipes, sockets and device control.

In addition to that, you can post your own packets to the port. Quoting from the documentation:
The PostQueuedCompletionStatus function allows an application to queue its own special-purpose completion packets to the I/O completion port without starting an asynchronous I/O operation.
An example of this is shown in the worker demo project (which uses no async I/O at all).
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