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 |
11 | |
12 | // Test the interoperation of std::lock_guard with std::mutex, since that is such |
13 | // a common use case. |
14 | |
15 | #include <cassert> |
16 | #include <mutex> |
17 | #include <type_traits> |
18 | #include <functional> |
19 | |
20 | #include "make_test_thread.h" |
21 | #include "test_macros.h" |
22 | |
23 | void do_try_lock(std::mutex& m) { assert(m.try_lock() == false); } |
24 | |
25 | int main(int, char**) { |
26 | { |
27 | std::mutex m; |
28 | { |
29 | std::lock_guard<std::mutex> lg(m); |
30 | std::thread t = support::make_test_thread(do_try_lock, std::ref(m)); |
31 | t.join(); |
32 | } |
33 | |
34 | // This should work because the lock_guard unlocked the mutex when it was destroyed above. |
35 | m.lock(); |
36 | m.unlock(); |
37 | } |
38 | |
39 | // Test CTAD |
40 | #if TEST_STD_VER >= 17 |
41 | { |
42 | std::mutex m; |
43 | std::lock_guard lg(m); |
44 | static_assert(std::is_same<decltype(lg), std::lock_guard<std::mutex>>::value, ""); |
45 | } |
46 | #endif |
47 | |
48 | return 0; |
49 | } |
50 |