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[C, C++ & Threads] Thread specific state, how do they do that?

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For example, when using OpenGL you first have to create an OpenGL context. Once you create that context all subsequent OpenGL calls are automagically routed to that context. When dealing with multiple threads, you have to set a particular context "current" for each thread so that all OpenGL calls on that thread are applied to that particular context. I'm curious how exactly are they achieving this.

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