1 files changed, 113 insertions, 0 deletions
diff --git a/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.guard/variadic_mutex.pass.cpp b/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.guard/variadic_mutex.pass.cpp
new file mode 100644
index 00000000000..d63dc12909d
--- /dev/null
+++ b/libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.guard/variadic_mutex.pass.cpp
@@ -0,0 +1,113 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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
+// UNSUPPORTED: c++98, c++03
+
+// <mutex>
+
+// template <class ...Mutex> class lock_guard;
+
+// explicit lock_guard(mutex_type& m);
+
+#define _LIBCPP_ABI_VARIADIC_LOCK_GUARD
+#include <mutex>
+#include <cassert>
+
+struct TestMutex {
+    bool locked = false;
+    TestMutex() = default;
+    ~TestMutex() { assert(!locked); }
+
+    void lock() { assert(!locked); locked = true; }
+    bool try_lock() { if (locked) return false; return locked = true; }
+    void unlock() { assert(locked); locked = false; }
+
+    TestMutex(TestMutex const&) = delete;
+    TestMutex& operator=(TestMutex const&) = delete;
+};
+
+#if !defined(TEST_HAS_NO_EXCEPTIONS)
+struct TestMutexThrows {
+    bool locked = false;
+    bool throws_on_lock = false;
+
+    TestMutexThrows() = default;
+    ~TestMutexThrows() { assert(!locked); }
+
+    void lock() {
+        assert(!locked);
+        if (throws_on_lock) {
+            throw 42;
+        }
+        locked = true;
+    }
+
+    bool try_lock() {
+        if (locked) return false;
+        lock();
+        return true;
+    }
+
+    void unlock() { assert(locked); locked = false; }
+
+    TestMutexThrows(TestMutexThrows const&) = delete;
+    TestMutexThrows& operator=(TestMutexThrows const&) = delete;
+};
+#endif // !defined(TEST_HAS_NO_EXCEPTIONS)
+
+int main()
+{
+    {
+        using LG = std::lock_guard<>;
+        LG lg;
+    }
+    {
+        using LG = std::lock_guard<TestMutex, TestMutex>;
+        TestMutex m1, m2;
+        {
+            LG lg(m1, m2);
+            assert(m1.locked && m2.locked);
+        }
+        assert(!m1.locked && !m2.locked);
+    }
+    {
+        using LG = std::lock_guard<TestMutex, TestMutex, TestMutex>;
+        TestMutex m1, m2, m3;
+        {
+            LG lg(m1, m2, m3);
+            assert(m1.locked && m2.locked && m3.locked);
+        }
+        assert(!m1.locked && !m2.locked && !m3.locked);
+    }
+#if !defined(TEST_HAS_NO_EXCEPTIONS)
+    {
+        using MT = TestMutexThrows;
+        using LG = std::lock_guard<MT, MT>;
+        MT m1, m2;
+        m1.throws_on_lock = true;
+        try {
+            LG lg(m1, m2);
+            assert(false);
+        } catch (int) {}
+        assert(!m1.locked && !m2.locked);
+    }
+    {
+        using MT = TestMutexThrows;
+        using LG = std::lock_guard<MT, MT, MT>;
+        MT m1, m2, m3;
+        m2.throws_on_lock = true;
+        try {
+            LG lg(m1, m2, m3);
+            assert(false);
+        } catch (int) {}
+        assert(!m1.locked && !m2.locked && !m3.locked);
+    }
+#endif
+}