1 //===----------------------------------------------------------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // UNSUPPORTED: libcpp-has-no-threads
11 // UNSUPPORTED: c++98, c++03, c++11
12 
13 // <shared_mutex>
14 
15 // template <class Mutex> class shared_lock;
16 
17 // void unlock();
18 
19 #include <shared_mutex>
20 #include <cassert>
21 
22 #include "test_macros.h"
23 
24 bool unlock_called = false;
25 
26 struct mutex
27 {
lock_sharedmutex28     void lock_shared() {}
unlock_sharedmutex29     void unlock_shared() {unlock_called = true;}
30 };
31 
32 mutex m;
33 
main()34 int main()
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