Kuba Brecka 224264ade0 [libcxx] Fix a data race in call_once ...

call_once is using relaxed atomic load to perform double-checked locking, which contains a data race. The fast-path load has to be an acquire atomic load.

Differential Revision: https://reviews.llvm.org/D24028

llvm-svn: 280621

2016-09-04 09:55:12 +00:00

182 KiB

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