commit 42da655e0f60f5aeafee2096d7f01b219fff6747
author Joseph Huber <jhuber6@vols.utk.edu> Thu Sep 23 17:18:53 2021 -0400
committer Copybara-Service <copybara-worker@google.com> Thu Sep 23 14:30:40 2021 -0700
tree f8deee5b70e1d5977a422b61a5cb36d41411c61c
parent 638dcbdc16d17984425055c0dba0c100d7d54094

[OpenMP] Fix data-race in new device RTL

This patch fixes a data-race observed when using the new device runtime
library. The Internal control variable for the parallel level is read in
the `__kmpc_parallel_51` function while it could potentially be written
by other threads. This causes data corruption and will cause
nondetermistic behaviour in the runtime. This patch fixes this by adding
an explicit synchronization before the region starts.

Reviewed By: jdoerfert

Differential Revision: https://reviews.llvm.org/D110366

GitOrigin-RevId: d83ca624a1d52b600ddbd8bfcbb3d5d7c6003af7