GH-15233: [C++] Correct thread contention in s3fs#34671

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EpsilonPrime wants to merge 2 commits intoapache:mainfrom EpsilonPrime:arrowfs_hanging

+56-9

Commits on Mar 22, 2023

Avoids thread contention by processing close actions synchronously from within the copy thread.
EpsilonPrime
committed
Added argument comments to make it easier to understand what the option does.
EpsilonPrime
committed