[3.13] gh-107851: Fix spurious failures in fcntl eintr tests (GH-121556)#121585
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…-121556) 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 <colesbury@gmail.com>
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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 colesbury@gmail.com