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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 
12 // <mutex>
13 
14 // class recursive_mutex;
15 
16 // void lock();
17 
18 #include <mutex>
19 #include <thread>
20 #include <cstdlib>
21 #include <cassert>
22 
23 #include <iostream>
24 
25 std::recursive_mutex m;
26 
27 typedef std::chrono::system_clock Clock;
28 typedef Clock::time_point time_point;
29 typedef Clock::duration duration;
30 typedef std::chrono::milliseconds ms;
31 typedef std::chrono::nanoseconds ns;
32 
f()33 void f()
34 {
35     time_point t0 = Clock::now();
36     m.lock();
37     time_point t1 = Clock::now();
38     m.lock();
39     m.unlock();
40     m.unlock();
41     ns d = t1 - t0 - ms(250);
42     assert(d < ms(200));  // within 200ms
43 }
44 
main()45 int main()
46 {
47     m.lock();
48     std::thread t(f);
49     std::this_thread::sleep_for(ms(250));
50     m.unlock();
51     t.join();
52 }
53