1 files changed, 25 insertions, 0 deletions
diff --git a/test/libcxx/thread/thread.mutex/thread_safety_lock_guard.pass.cpp b/test/libcxx/thread/thread.mutex/thread_safety_lock_guard.pass.cpp
new file mode 100644
index 000000000000..4e85a039686a
--- /dev/null
+++ b/test/libcxx/thread/thread.mutex/thread_safety_lock_guard.pass.cpp
@@ -0,0 +1,25 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: libcpp-has-no-threads
+// REQUIRES: thread-safety
+
+// <mutex>
+
+#define _LIBCPP_ENABLE_THREAD_SAFETY_ANNOTATIONS
+
+#include <mutex>
+
+std::mutex m;
+int foo __attribute__((guarded_by(m)));
+
+int main() {
+  std::lock_guard<std::mutex> lock(m);
+  foo++;
+}