Multithreading – reentry locking: advantages and disadvantages?

Under what circumstances do people want to use turn back locks and ordinary locks?

Solution

I think reentrant locks have some extra overhead compared to ordinary locks - checking the thread that is acquiring the lock

Therefore, if you know that under normal operation, a thread will only acquire a lock once before releasing it again, you can get some performance by using normal locking This is particularly useful in tight loops, etc