Kimi K3 — 面向长时编码与 Agent 任务的开放前沿模型

Kimi K3 的真实输出

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Explain the difference between a mutex and a semaphore in two short paragraphs, and say when to use each.

A mutex (mutual exclusion) is a locking mechanism with ownership: the thread that locks it must be the one to unlock it, and only one thread can hold it at a time. It exists to protect shared resources from concurrent access. A semaphore is a counter with no ownership: one thread can signal (increment) it while another waits (decrements) it. A binary semaphore acts like a mutex, but counting semaphores allow N threads to access a pool of resources simultaneously. When to use each: Use a mutex when you need exclusive access to shared data—like protecting a critical section or data structure from race conditions. Use a semaphore when you're coordinating or signaling between threads—like limiting access to a fixed pool of connections, implementing producer-consumer queues, or notifying one thread that work is available.

生成于 2026-09-28。每次运行的回答都可能不同。