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 // shared_lock();
20 
21 #include <shared_mutex>
22 #include <cassert>
23 
24 #include "test_macros.h"
25 
main(int,char **)26 int main(int, char**)
27 {
28     std::shared_lock<std::shared_timed_mutex> ul;
29     assert(!ul.owns_lock());
30     assert(ul.mutex() == nullptr);
31 
32   return 0;
33 }
34