Thread Safety Analysis: turn off checking within trylock functions.

llvm-svn: 159601

clang/lib/Analysis/ThreadSafety.cpp

@@ -1654,6 +1654,12 @@ void ThreadSafetyAnalyzer::runAnalysis(AnalysisDeclContext &AC) {
       } else if (isa<SharedLockFunctionAttr>(Attr)) {
         // Don't try to check lock functions for now
         return;
+      } else if (isa<ExclusiveTrylockFunctionAttr>(Attr)) {
+        // Don't try to check trylock functions for now
+        return;
+      } else if (isa<SharedTrylockFunctionAttr>(Attr)) {
+        // Don't try to check trylock functions for now
+        return;
       }
     }
   }

clang/test/SemaCXX/warn-thread-safety-analysis.cpp

@@ -2403,6 +2403,33 @@ void Foo::test3() {
 } // end namespace ReleasableScopedLock
 
 
+namespace TrylockFunctionTest {
+
+class Foo {
+public:
+  Mutex mu1_;
+  Mutex mu2_;
+  bool c;
+
+  bool lockBoth() EXCLUSIVE_TRYLOCK_FUNCTION(true, mu1_, mu2_);
+};
+
+bool Foo::lockBoth() {
+  if (!mu1_.TryLock())
+    return false;
+
+  mu2_.Lock();
+  if (!c) {
+    mu1_.Unlock();
+    mu2_.Unlock();
+    return false;
+  }
+
+  return true;
+}
+
+
+}  // end namespace TrylockFunctionTest