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
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
|
//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// UNSUPPORTED: libcpp-has-no-threads
// <mutex>
// class timed_mutex;
// template <class Clock, class Duration>
// bool try_lock_until(const chrono::time_point<Clock, Duration>& abs_time);
#include <mutex>
#include <thread>
#include <cstdlib>
#include <cassert>
std::timed_mutex m;
typedef std::chrono::steady_clock Clock;
typedef Clock::time_point time_point;
typedef Clock::duration duration;
typedef std::chrono::milliseconds ms;
typedef std::chrono::nanoseconds ns;
void f1()
{
time_point t0 = Clock::now();
assert(m.try_lock_until(Clock::now() + ms(300)) == true);
time_point t1 = Clock::now();
m.unlock();
ns d = t1 - t0 - ms(250);
assert(d < ms(50)); // within 50ms
}
void f2()
{
time_point t0 = Clock::now();
assert(m.try_lock_until(Clock::now() + ms(250)) == false);
time_point t1 = Clock::now();
ns d = t1 - t0 - ms(250);
assert(d < ms(50)); // within 50ms
}
int main()
{
{
m.lock();
std::thread t(f1);
std::this_thread::sleep_for(ms(250));
m.unlock();
t.join();
}
{
m.lock();
std::thread t(f2);
std::this_thread::sleep_for(ms(300));
m.unlock();
t.join();
}
}
|
