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A module could possibly be rewritten to utilize the new features in threaded Perl to increase performance in a threaded environment.If you're using a module that's not thread-safe for some reason, you can protect yourself by using it from one, and only one thread at all. The core the threads manpage module provides the basic functions you need to write threaded programs.This model is also handy for a form of recursive programming where, rather than having a subroutine call itself, it instead creates another thread.Prime and Fibonacci generators both map well to this form of the pipeline model.There is another older Perl threading flavour called the 5.005 model, unsurprisingly for 5.005 versions of Perl.

Even if a module is thread-safe, it doesn't mean that the module is optimized to work well with threads.NOTE: this tutorial describes the new Perl threading flavour introduced in Perl 5.6.0 called interpreter threads, or ithreads for short.In this model each thread runs in its own Perl interpreter, and any data sharing between threads must be explicit.Not all modules that you might use are thread-safe, and you should always assume a module is unsafe unless the documentation says otherwise.This includes modules that are distributed as part of the core.

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