Comment by NightMKoder

I haven’t heard about conditional critical regions before - here’s a interesting set of slides for others: http://www-ist.massey.ac.nz/csnotes/355/lectures/monitors.pd... .

Seems very closely related to condition variables - except you specify the condition at the lock site rather than via a “trigger” before an unlock. I think Google’s internal Mutex class had a LockWhen(callback) which is a pleasure to work with. Definitely an awesome concept.