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 // <shared_mutex>
13 
14 // template <class Mutex> class shared_lock;
15 
16 // void unlock();
17 
18 #include <shared_mutex>
19 #include <cassert>
20 #include <system_error>
21 
22 #include "test_macros.h"
23 
24 bool unlock_called = false;
25 
26 struct mutex
27 {
28     void lock_shared() {}
29     void unlock_shared() {unlock_called = true;}
30 };
31 
32 mutex m;
33 
34 int main(int, char**)
35 {
36     std::shared_lock<mutex> lk(m);
37     lk.unlock();
38     assert(unlock_called == true);
39     assert(lk.owns_lock() == false);
40 #ifndef TEST_HAS_NO_EXCEPTIONS
41     try
42     {
43         lk.unlock();
44         assert(false);
45     }
46     catch (std::system_error& e)
47     {
48         assert(e.code().value() == EPERM);
49     }
50 #endif
51     lk.release();
52 #ifndef TEST_HAS_NO_EXCEPTIONS
53     try
54     {
55         lk.unlock();
56         assert(false);
57     }
58     catch (std::system_error& e)
59     {
60         assert(e.code().value() == EPERM);
61     }
62 #endif
63 
64   return 0;
65 }
66