[flang-commits] [flang] Move deallocation of I/O resources under STOP to a critical section (PR #74181)

[Peter Klausler via flang-commits]

https://github.com/klausler commented:

I don't understand why this lock is needed here. CloseAllExternalUnits ends up calling ExternalFileUnit::CloseAll, which already has a critical section in it.

https://github.com/llvm/llvm-project/pull/74181