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No. It's a kind of RAM integrated into your processor. The cache memory is usually small and is used to store data that is being used by the processor because accessing the main RAM directly will be slower.

In multiple-processor systems, a problem called cache incoherence can occur when two or more processors access the same region, modifies the data in different ways and not immediately writing back the data to the main RAM. It will cause two different versions of the same region existing simultaneously, causing problems. That is why mutexes or other locks should be used when accessing shared memory.

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