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// <shared_mutex>
11
12// class shared_timed_mutex;
13
14// template <class Rep, class Period>
15//     bool try_lock_shared_for(const chrono::duration<Rep, Period>& rel_time);
16
17#include <shared_mutex>
18#include <thread>
19#include <vector>
20#include <cstdlib>
21#include <cassert>
22
23#if _LIBCPP_STD_VER > 11
24
25std::shared_timed_mutex m;
26
27typedef std::chrono::steady_clock Clock;
28typedef Clock::time_point time_point;
29typedef Clock::duration duration;
30typedef std::chrono::milliseconds ms;
31typedef std::chrono::nanoseconds ns;
32
33void f1()
34{
35    time_point t0 = Clock::now();
36    assert(m.try_lock_shared_for(ms(300)) == true);
37    time_point t1 = Clock::now();
38    m.unlock_shared();
39    ns d = t1 - t0 - ms(250);
40    assert(d < ms(50));  // within 50ms
41}
42
43void f2()
44{
45    time_point t0 = Clock::now();
46    assert(m.try_lock_shared_for(ms(250)) == false);
47    time_point t1 = Clock::now();
48    ns d = t1 - t0 - ms(250);
49    assert(d < ms(50));  // within 50ms
50}
51
52#endif  // _LIBCPP_STD_VER > 11
53
54int main()
55{
56#if _LIBCPP_STD_VER > 11
57    {
58        m.lock();
59        std::vector<std::thread> v;
60        for (int i = 0; i < 5; ++i)
61            v.push_back(std::thread(f1));
62        std::this_thread::sleep_for(ms(250));
63        m.unlock();
64        for (auto& t : v)
65            t.join();
66    }
67    {
68        m.lock();
69        std::vector<std::thread> v;
70        for (int i = 0; i < 5; ++i)
71            v.push_back(std::thread(f2));
72        std::this_thread::sleep_for(ms(300));
73        m.unlock();
74        for (auto& t : v)
75            t.join();
76    }
77#endif  // _LIBCPP_STD_VER > 11
78}
79