compat: prevent deadlock with race

We can't depend on cvar getting notified only after "src" runs out of
scope.

Now, in case signal destroyed() runs first:

- mtx locked
- flag set to true
- empty cvar notified

Thus, doesn't hang.

In case we wait first:

- mtx locked
- flag is false
- cvar notification arrives

Of course semaphore code always runs serially since they're covered by a
mutex. We have all our bases covered.

Previously the code never hung simply because the "curthread" condition
was always true.

I removed the "curthread" code paths since they don't add anything. Also
rvalue references got used incorrectly.

0 files changed, 0 insertions, 0 deletions