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: libcpp-has-no-threads
10 // UNSUPPORTED: c++03, c++11
11 
12 // shared_timed_mutex was introduced in macosx10.12
13 // UNSUPPORTED: use_system_cxx_lib && x86_64-apple-macosx10.11
14 // UNSUPPORTED: use_system_cxx_lib && x86_64-apple-macosx10.10
15 // UNSUPPORTED: use_system_cxx_lib && x86_64-apple-macosx10.9
16 
17 // <shared_mutex>
18 
19 // class shared_timed_mutex;
20 
21 // void lock();
22 
23 #include <shared_mutex>
24 #include <thread>
25 #include <cstdlib>
26 #include <cassert>
27 
28 #include "make_test_thread.h"
29 #include "test_macros.h"
30 
31 std::shared_timed_mutex m;
32 
33 typedef std::chrono::system_clock Clock;
34 typedef Clock::time_point time_point;
35 typedef Clock::duration duration;
36 typedef std::chrono::milliseconds ms;
37 typedef std::chrono::nanoseconds ns;
38 
39 std::atomic<bool> ready(false);
40 time_point start;
41 
42 ms WaitTime = ms(250);
43 
44 void f()
45 {
46   ready.store(true);
47   m.lock();
48   time_point t0 = start;
49   time_point t1 = Clock::now();
50   m.unlock();
51   assert(t0.time_since_epoch() > ms(0));
52   assert(t1 - t0 >= WaitTime);
53 }
54 
55 int main(int, char**)
56 {
57   m.lock();
58   std::thread t = support::make_test_thread(f);
59   while (!ready)
60     std::this_thread::yield();
61   start = Clock::now();
62   std::this_thread::sleep_for(WaitTime);
63   m.unlock();
64   t.join();
65 
66   return 0;
67 }
68