Weston Pace created ARROW-11942:
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Summary: [C++] If tasks are submitted quickly the thread pool may
fail to spin up new threads
Key: ARROW-11942
URL: https://issues.apache.org/jira/browse/ARROW-11942
Project: Apache Arrow
Issue Type: Bug
Components: C++
Reporter: Weston Pace
Assignee: Weston Pace
Probably only really affects unit tests. Consider an idle thread pool with 1
thread (ready_count_ == 1). If `Spawn` is called very quickly it may look like
`ready_count_` is still greater than 0 (because `ready_count_` doesn't
necessarily decrement by the time `Spawn` returns) and so it will not spin up
new threads.
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