[3.12] gh-107851: Fix spurious failures in fcntl eintr tests (GH-121556) #121586
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On heavily loaded machines, the subprocess may finish its sleep before
the parent process manages to synchronize with it via a failed lock.
This leads to errors like:
Exception: failed to sync child in 300.3 sec
Use pipes instead to mutually synchronize between parent and child.
(cherry picked from commit af9f6de)
Co-authored-by: Sam Gross [email protected]