What is the purpose of a mutex in concurrent programming?

Question

BlackTom AI · Accepted Answer

The question asks: What is the purpose of a mutex in concurrent programming?

Option a: To improve thread performance in terms of speed. While a mutex can indirectly affect performance, its primary purpose is not to speed up threads but to coordinate access to shared resources. In fact, incorrect use can degrade performance due to contention and blocking.

Option b: To control thread scheduling and give higher priorities to our threads. Mutexes do not control the OS-level scheduling or thread priorities. They merely enforce mutual exclusion for a critical section, not scheduling decisions or priority manipulation.

Option c: To provide mutual exclusion to critical sections of code. This is the core purpose of a mutex: ensuring that only one thread at a time can enter a protected region, preventing data races and ensuring consistency of shared state.

Option d: To handle exceptions in threads so the executed program does not fail. While proper error handling is important, a mutex is not a mechanism for exception handling. It cannot guarantee that exceptions won’t propagate or cause a failure; its job is synchronization, not error management.

In summary, option c accurately captures the role of a mutex in preventing concurrent access to shared resources, whereas the other options describe outcomes or functions that mutexes do not provide.

What is the purpose of a mutex in concurrent programming?单项选择题

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