A critical section is a segment of code in a concurrent program where shared resources are accessed, and it must be executed by only one thread or process at a time to prevent data inconsistency. Proper management of critical sections is essential to avoid issues like race conditions, ensuring that when one thread is executing in its critical section, no other thread can enter its own critical section that accesses the same resource. This control is vital in both shared memory environments and when using parallel constructs that involve multiple threads or processes.
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