Mastering Java: The Ultimate 2025 All-In-One Quiz to Excel in 'Thinking in Java

Question: 1 / 510

What is a semaphore?

A signaling mechanism

A semaphore is a signaling mechanism used in computer science to control access to a shared resource between multiple threads or processes. This is done by using counters and the "wait" and "signal" operations. Option B, a data structure for concurrency, is incorrect because a semaphore itself is not a data structure, but rather uses data structures to function. Option C, a type of exception, is incorrect because a semaphore is not an error or exception, but rather a tool used to prevent potential errors. Option D, a memory management feature, is incorrect because a semaphore does not manage memory, but rather controls access to shared resources.

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A data structure for concurrency

A type of exception

A memory management feature

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