What are the differences between mutexes and spinlocks in C++?

What are the differences between mutexes and spinlocks in C++?

Mutexes and spinlocks are both synchronization primitives used in C++. Mutexes block the thread until the lock is available, while spinlocks keep checking in a loop (spinning) until the lock is free.

When should I use a mutex instead of a spinlock?

Use a mutex when you expect the lock to be held for a longer duration, as it avoids wasting CPU cycles. Spinlocks are better for short, quick locks.

Are there any performance considerations I should be aware of?

Yes, spinlocks can be more efficient for short critical sections on multi-core systems, but they can lead to CPU contention if held for too long. Mutexes are generally safer for longer operations.

Can you give an example of when to use each?

Sure! Use a mutex for protecting shared data in a file operation, while a spinlock might be suitable for a quick update to a shared counter.