//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

// UNSUPPORTED: no-threads

// <mutex>

// GCC doesn't have thread safety attributes
// UNSUPPORTED: gcc

// ADDITIONAL_COMPILE_FLAGS: -Wthread-safety

// XFAIL: FROZEN-CXX03-HEADERS-FIXME

#include <mutex>

std::mutex m;

void f() { m.lock(); } // expected-warning {{mutex 'm' is still held at the end of function}}