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 <cassert>
19 #include <cerrno>
20 #include <shared_mutex>
21 #include <system_error>
22 
23 #include "test_macros.h"
24 
25 bool unlock_called = false;
26 
27 struct mutex
28 {
lock_sharedmutex29     void lock_shared() {}
unlock_sharedmutex30     void unlock_shared() {unlock_called = true;}
31 };
32 
33 mutex m;
34 
main(int,char **)35 int main(int, char**)
36 {
37     std::shared_lock<mutex> lk(m);
38     lk.unlock();
39     assert(unlock_called == true);
40     assert(lk.owns_lock() == false);
41 #ifndef TEST_HAS_NO_EXCEPTIONS
42     try
43     {
44         lk.unlock();
45         assert(false);
46     }
47     catch (std::system_error& e)
48     {
49         assert(e.code().value() == EPERM);
50     }
51 #endif
52     lk.release();
53 #ifndef TEST_HAS_NO_EXCEPTIONS
54     try
55     {
56         lk.unlock();
57         assert(false);
58     }
59     catch (std::system_error& e)
60     {
61         assert(e.code().value() == EPERM);
62     }
63 #endif
64 
65   return 0;
66 }
67