bulbazord requested changes to this revision.
bulbazord added a comment.
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I think that the idea you've laid out in the summary makes sense but the 
implementation seems off.
My understanding of `std::condition_variable` is that combined with 
`std::mutex` it is used to facilitate inter-thread synchronization. That would 
make sense if `thread_1` and `thread_2` both used a mutex and 
condition_variable to communicate with each other about the status of `n` but 
it looks like only `thread_1` actually uses and manages the 
mutex/condition_variable. Why is `call_and_wait` invoking `notify_one` when 
it's also what invokes `baz` (which is what is invoking `wait`)? This seems 
somewhat sketchy because the thread that is performing the notifications is the 
same thread that is performing the wait.

To accomplish your goal, I think it would probably look more like this:

1. `compute_pow` should acquire the lock on the mutex, modify `n`, unlock, and 
then invoke `cv.notify_one()`.
2. `call_and_wait` should only invoke `baz`. I don't think that the 
implementation of `baz` would require any modifications. Maybe `thread_2` could 
run `baz` directly instead?

Perhaps I'm mistaken about some details but I think this could probably be 
written in a clearer way.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D139484/new/

https://reviews.llvm.org/D139484

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