Use atomic operations for accessing this global counter.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74294 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Support/Annotation.cpp b/lib/Support/Annotation.cpp
index 9c3efa3..b778043 100644
--- a/lib/Support/Annotation.cpp
+++ b/lib/Support/Annotation.cpp
@@ -68,9 +68,12 @@
if (I == E) {
sys::SmartScopedWriter<true> Writer(&*AnnotationsLock);
I = IDMap->find(Name);
- if (I == IDMap->end())
- (*IDMap)[Name] = IDCounter++; // Add a new element
- return AnnotationID(IDCounter-1);
+ if (I == IDMap->end()) {
+ unsigned newCount = sys::AtomicIncrement(&IDCounter);
+ (*IDMap)[Name] = newCount-1; // Add a new element
+ return AnnotationID(newCount-1);
+ } else
+ return AnnotationID(I->second);
}
return AnnotationID(I->second);
}