[llvm-commits] [llvm] r74294 - /llvm/trunk/lib/Support/Annotation.cpp

[Owen Anderson]

Author: resistor
Date: Fri Jun 26 13:09:03 2009
New Revision: 74294

URL: http://llvm.org/viewvc/llvm-project?rev=74294&view=rev
Log:
Use atomic operations for accessing this global counter.

Modified:
    llvm/trunk/lib/Support/Annotation.cpp

Modified: llvm/trunk/lib/Support/Annotation.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Support/Annotation.cpp?rev=74294&r1=74293&r2=74294&view=diff

==============================================================================
--- llvm/trunk/lib/Support/Annotation.cpp (original)
+++ llvm/trunk/lib/Support/Annotation.cpp Fri Jun 26 13:09:03 2009
@@ -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);
 }