Charles-François Natali <neolo...@free.fr> added the comment: There was a recent buildbot failure on test_lock_conflict() because of a race. Looking at your patch, I must be missing something, but why not simply use a multiprocessing condition to signal when the parent process has acquired the lock? Otherwise you could simply use a pipe or a socketpair, it would be much simpler. Also, there's a race: if the parent process calls connect() before the child calls listen(), he'll get ECONNREFUSED.
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