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AthenaServices: Thread-local alternate stack.

Scott Snyder requested to merge ssnyder/athena:altStack.AthenaServices-20210630 into master

When we establish the core dump signal handler, we also try to set up an alternate stack, so that it will work even if the stack is corrupt/exhausted. But this didn't really work for MT jobs because the alternate stack is thread-local.

Make the alternate stack thread-local. Use the existing BeginEvent handler to ensure that the alternate stack is set for the current thread.

See ATLASRECTS-6442.

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