1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
|
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// UNSUPPORTED: libcpp-has-no-threads
// <mutex>
// template <class Mutex> class lock_guard;
// explicit lock_guard(mutex_type& m);
// template<class _Mutex> lock_guard(lock_guard<_Mutex>)
// -> lock_guard<_Mutex>; // C++17
#include <mutex>
#include <cstdlib>
#include <cassert>
#include "make_test_thread.h"
#include "test_macros.h"
std::mutex m;
void do_try_lock() {
assert(m.try_lock() == false);
}
int main(int, char**) {
{
std::lock_guard<std::mutex> lg(m);
std::thread t = support::make_test_thread(do_try_lock);
t.join();
}
m.lock();
m.unlock();
#ifdef __cpp_deduction_guides
std::lock_guard lg(m);
static_assert((std::is_same<decltype(lg), std::lock_guard<decltype(m)>>::value), "" );
#endif
return 0;
}
|
