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In this article we explore how to turn a single threaded Perl/Tk GUI application into a multi-threaded one; examining the steps, the obstacles and the benefits. Along the way we cover concepts such as callbacks, events, windows messages, thread affinity, thread safety and more.
For code demonstration purposes we will use Perl, the Tk toollkit, and an open source application of mine, Unrar Extract and Recover, which is the real world example that this article is based on.


This application started as single thread and evolved into a threaded one.Using Perl also provides an opportunity to look at the workings from a low level view since frameworks like .NET hide a lot of the underlying complexity.



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