framlog commented on a change in pull request #12350:
URL: https://github.com/apache/arrow/pull/12350#discussion_r800452737
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File path: cpp/src/arrow/util/thread_pool.h
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@@ -373,7 +374,7 @@ class ARROW_EXPORT ThreadPool : public Executor {
State* state_;
bool shutdown_on_destroy_;
#ifndef _WIN32
- pid_t pid_;
+ std::atomic<pid_t> pid_;
Review comment:
It's initialized at
https://github.com/apache/arrow/blob/master/cpp/src/arrow/util/thread_pool.cc#L225.
And I don't think it should be zero when it's initialized.
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