1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // UNSUPPORTED: no-threads
10 // UNSUPPORTED: c++03, c++11
11 
12 // dylib support for shared_mutex was added in macosx10.12
13 // XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11}}
14 
15 // <shared_mutex>
16 
17 // template <class Mutex> class shared_lock;
18 
19 // mutex_type *mutex() const noexcept;
20 
21 #include <shared_mutex>
22 #include <cassert>
23 
24 #include "test_macros.h"
25 
26 std::shared_timed_mutex m;
27 
main(int,char **)28 int main(int, char**)
29 {
30     std::shared_lock<std::shared_timed_mutex> lk0;
31     assert(lk0.mutex() == nullptr);
32     std::shared_lock<std::shared_timed_mutex> lk1(m);
33     assert(lk1.mutex() == &m);
34     lk1.unlock();
35     assert(lk1.mutex() == &m);
36     static_assert(noexcept(lk0.mutex()), "mutex() must be noexcept");
37 
38   return 0;
39 }
40