TLS/GC issues on macOS

Sönke Ludwig sludwig+d at
Thu Jan 3 12:58:13 UTC 2019

There appears to be a GC visibility issue of TLS sections on macOS when 
multiple threads are involved. I added a test case to what looks like 
the same issue:

The question is, does anyone have enough insight on the TLS 
implementation to make a quick diagnosis or fix?

This is biting us pretty hard in our upcoming commercial project (DMD 
has codegen issues on macOS), so any help would be highly appreciated.

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