WiredTiger has its own implementation of "condition variable". However, the guarantee it provides is different to the definition of the standard condition variable.

The rules for a standard condition variables are that all operations are as-if atomic, so a wait cannot see a notification that came before. In other words, a condition variable guarantees that earlier notifications don't wake later waiters While in our implementation, an earlier notification will wake a later waiter.

This creates confusion.

We can either rename our condition variable or explore whether we can use the standard implementation instead.