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Antoine Pitrou authored and GitHub committed 619b034bd3e
ARROW-17975: [C++] Create at-fork facility (#14594) Also migrate the `ThreadPool` class to use the new facility. The `util::GlobalForkSafeMutex` facility is now unused, we may want to remove it in a later PR. Authored-by: Antoine Pitrou <antoine@python.org> Signed-off-by: Antoine Pitrou <antoine@python.org>