One thing we can do to avoid this can of weird async stuff from happening 
(LockFileEx is asynchronous if the file is not opened in synchronous mode) 
is to use LOCKFILE_FAIL_IMMEDIATELY and then actively wait.

Sort of the approach followed by oauth2client:
https://github.com/google/oauth2client/blob/master/oauth2client/locked_file.py

It's uglier but if it at least works it's an improvement.

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