Which of the following concurrency control techniques ensures that only one thread can access a resource at a time?

Question

BlackTom AI · Accepted Answer

To begin, let's lay out the question: Which concurrency control technique ensures that only one thread can access a resource at a time?

Option a: Thread pooling. This refers to managing a pool of worker threads to reuse them for multiple tasks, which improves efficiency but does not by itself restrict a single resource to one thread at a time. It does not guarantee exclusive access to a resource.

Option b: Parallel execution. This describes performing multiple tasks simultaneously, often on multiple cores. While it increases throughput, it explicitly allows multiple threads to operate in parallel and does not enforce exclusive access to a single resource.

Option c: Concurrent execution. Similar to parallel execution, this means multiple tasks progress at the same time, potentially overlapping in time. It does not inherently prevent more than one thread from accessing the same resource simultaneously.

Option d: Mutual exclusion. The term "mutual exclusion" directly captures the idea of restricting access so that only one thread can hold or access a resource at a time. This is typically implemented via locks, mutexes, or similar synchronization primitives to prevent race conditions and ensure exclusive access.

Further nuance: The essence of mutual exclusion is to serialize access to a critical section or resource, thereby preventing concurrent modifications. The other options describe patterns or behaviors related to concurrency and performance, but they do not inherently enforce exclusive access to a resource. Therefore, when the goal is strict single-thread access to a resource, mutual exclusion is the mechanism that achieves this.

In summary, among the listed techniques, the one that enforces exclusive access by ensuring only one thread can access a resource at a time is mutual exclusion.

Which of the following concurrency control techniques ensures that only one thread can access a resource at a time?单项选择题

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