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What are critical sections in threads

I read about mutecs, semaphores, and critical sections. I understand that a mutex synchronizes a resource, so that only one thread accesses it at a time when the semaphore allows a specific thread thread to access the resource, but what do critical sections do?

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Under normal use, a critical section is a section of code that must be executed sequentially - that is, only one thread can execute this code at any given time. You usually do this by protecting the code with a mutex semaphore.

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