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3. A syn chronization primitive is implemented as a test and exchange operation, but if the lock is not available, it only executes reads until the lock is available. This is known as a a. Condition variable b. Monitor c. spinlock d. Semaphore True or False: One difference between threads and processes is that processes share a common memory space with each other, threads do not. 4.
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3. Semaphore, because semaphore is a variable used for synchronization.

4. False, because threads also share common memory.

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