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Asked: 2026-06-12T22:18:30+00:00

I’m currently using QT (4) to parallelize a non-threadsafe library that’s written in C

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I’m currently using QT (4) to parallelize a non-threadsafe library that’s written in C by non-programmers, and thus has a lot of global variables. The threads don’t need to interact or share data, they each just call a bunch of methods of the library and then at the end the library gives an output that is used further.

The problem is, though, that global variables are per default shared between threads, causing the library to crash in different places. There are two ways to fix this:

Refactor the entire library to not use global variables (ouch), or find a way to make global variables non-shared, or find a third magic way.

Is the latter an option with QT or standard (C++01) C++?

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  1. Editorial Team

    Using thread local storage is a way to make global variables non-shared. Starting point for that, with links to details for different implementations:

    http://en.wikipedia.org/wiki/Thread-local_storage

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