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