westonpace commented on a change in pull request #12358:
URL: https://github.com/apache/arrow/pull/12358#discussion_r801327711
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File path: cpp/src/arrow/util/thread_pool.h
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@@ -373,7 +377,7 @@ class ARROW_EXPORT ThreadPool : public Executor {
State* state_;
bool shutdown_on_destroy_;
#ifndef _WIN32
- pid_t pid_;
+ std::atomic<pid_t> pid_;
Review comment:
That should be ok because we have the double check on line 247 which
happens inside the mutex.
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