[PATCH] D121337: [BOLT][NFC] Fix print-cfg data race

[Amir Ayupov via Phabricator via llvm-commits]

Amir created this revision.
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Addresses ThreadSanitizer warning


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D121337

Files:
  bolt/lib/Rewrite/RewriteInstance.cpp


Index: bolt/lib/Rewrite/RewriteInstance.cpp
===================================================================
--- bolt/lib/Rewrite/RewriteInstance.cpp
+++ bolt/lib/Rewrite/RewriteInstance.cpp
@@ -2939,8 +2939,10 @@
         if (!BF.buildCFG(AllocId))
           return;
 
-        if (opts::PrintAll)
+        if (opts::PrintAll) {
+          auto L = BC->scopeLock();
           BF.print(outs(), "while building cfg", true);
+        }
       };
 
   ParallelUtilities::PredicateTy SkipPredicate = [&](const BinaryFunction &BF) {


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