Maxim Kuvyrkov 6b287234ea
Fix racy msan test ...
Summary:
Child thread may finish before pthread_setname_np() and/or
pthread_getname_np() had a chance to run, which causes these functions
to fail with ENOENT (meaning /proc/self/task/[tid]/comm doesn't exist).
Fix by stalling child thread on a mutex.
Reviewers: eugenis
Reviewed By: eugenis
Subscribers: llvm-commits, #sanitizers
Differential Revision: https://reviews.llvm.org/D43548
llvm-svn: 325703
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