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Posted to jira@arrow.apache.org by "Weston Pace (Jira)" <ji...@apache.org> on 2022/10/12 01:16:00 UTC

[jira] [Created] (ARROW-17996) [C++] Potential race condition in readahead generator

Weston Pace created ARROW-17996:
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             Summary: [C++] Potential race condition in readahead generator
                 Key: ARROW-17996
                 URL: https://issues.apache.org/jira/browse/ARROW-17996
             Project: Apache Arrow
          Issue Type: Bug
          Components: C++
            Reporter: Weston Pace


It is possible for the final future to get marked finished twice.

Thread 1: Polls the generator, checks finished (false), is about to add a task
Thread 2: Finishes, marks finished, decrements running tasks to 0
Thread 1: adds task, immediately finishes, decrements running tasks to 0

Both threads will attempt to mark the final future finished.



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