5 files changed, 43 insertions, 0 deletions
diff --git a/clang/test/Modules/Inputs/thread-safety/a.h b/clang/test/Modules/Inputs/thread-safety/a.h
new file mode 100644
index 00000000000..879c038cf97
--- /dev/null
+++ b/clang/test/Modules/Inputs/thread-safety/a.h
@@ -0,0 +1,4 @@
+struct __attribute__((lockable)) mutex {
+  void lock() __attribute__((exclusive_lock_function));
+  void unlock() __attribute__((unlock_function));
+};
diff --git a/clang/test/Modules/Inputs/thread-safety/b.h b/clang/test/Modules/Inputs/thread-safety/b.h
new file mode 100644
index 00000000000..c8ed23738f1
--- /dev/null
+++ b/clang/test/Modules/Inputs/thread-safety/b.h
@@ -0,0 +1,8 @@
+#include "a.h"
+
+struct X {
+  mutex m;
+  int n __attribute__((guarded_by(m)));
+
+  void f();
+};
diff --git a/clang/test/Modules/Inputs/thread-safety/c.h b/clang/test/Modules/Inputs/thread-safety/c.h
new file mode 100644
index 00000000000..ec849c2250a
--- /dev/null
+++ b/clang/test/Modules/Inputs/thread-safety/c.h
@@ -0,0 +1,10 @@
+#include "a.h"
+
+struct X {
+  mutex m;
+  int n __attribute__((guarded_by(m)));
+
+  void f();
+};
+
+inline void unlock(X &x) __attribute__((unlock_function(x.m))) { x.m.unlock(); }
diff --git a/clang/test/Modules/Inputs/thread-safety/module.map b/clang/test/Modules/Inputs/thread-safety/module.map
new file mode 100644
index 00000000000..bd6ea830c2d
--- /dev/null
+++ b/clang/test/Modules/Inputs/thread-safety/module.map
@@ -0,0 +1,3 @@
+module a { header "a.h" }
+module b { header "b.h" export * }
+module c { header "c.h" export * }
diff --git a/clang/test/Modules/thread-safety.cpp b/clang/test/Modules/thread-safety.cpp
new file mode 100644
index 00000000000..e6e85d284c8
--- /dev/null
+++ b/clang/test/Modules/thread-safety.cpp
@@ -0,0 +1,18 @@
+// RUN: rm -rf %t
+// RUN: %clang_cc1 -fmodules -fmodules-cache-path=%t -fimplicit-module-maps \
+// RUN:            -I%S/Inputs/thread-safety -std=c++11 -Wthread-safety \
+// RUN:            -verify %s
+//
+// expected-no-diagnostics
+
+#include "b.h"
+#include "c.h"
+
+bool g();
+void X::f() {
+  m.lock();
+  if (g())
+    m.unlock();
+  else
+    unlock(*this);
+}