Hi Eliot, I noticed you revamped Mutex earlier this year, and I'm
having an issue where they're stopped even though there are no other
processes inside the critical block.  Those processes were background
processes that ended up opening a debugger, which was closed.

The Mutex is stuck and I have no internal "semaphore" I can signal
anymore, it appears to be coupled straight to the VM (for better
performance, I assume).

Even when I restart the process in a frame totally above the method
whcih even enters the #critical:, it still halts there.