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Antoine PitrouYibo Cai
d056829e877
Antoine Pitrou authored and Yibo Cai committed 70d1f879eac
ARROW-15593: [C++] Make after-fork ThreadPool reinitialization thread-safe

Since after-fork reinitialization is triggered when one of the ThreadPool methods is called, it can be very well be called from multiple threads at once.  Make it thread-safe.

Closes #12358 from pitrou/ARROW-15593-thread-pool-race-condition

Authored-by: Antoine Pitrou <antoine@python.org>
Signed-off-by: Yibo Cai <yibo.cai@arm.com>