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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2022/03/01 13:47:19 UTC

[GitHub] [arrow] westonpace commented on issue #12527: [C++] how to run arrow::StringArray::GetString in parallel?

westonpace commented on issue #12527:
URL: https://github.com/apache/arrow/issues/12527#issuecomment-1055459002


   If that code is hanging then I don't think it is due to `a->GetString(i)`.  At a glance it would seem that method call is thread safe.
   
   I do not think it is thread safe to call `UniqueStrings.insert` from multiple threads although I would generally expect a segmentation fault and not a deadlock/hang.
   
   I have no idea what `doSomethingElse` might be doing but it could also be contributing to this deadlock.
   
   Why don't you run this in the debugger and then run `thread apply all bt` when you reach the deadlock?


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