blob: 6b2d9a543e57eef29c8525b12aad0c44b03149f8 (
plain)
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
|
//===----------------------------------------------------------------------===//
//
// 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
// UNSUPPORTED: c++98, c++03, c++11
// <shared_mutex>
// class shared_timed_mutex;
// bool try_lock();
#include <shared_mutex>
#include <thread>
#include <cstdlib>
#include <cassert>
std::shared_timed_mutex m;
typedef std::chrono::system_clock Clock;
typedef Clock::time_point time_point;
typedef Clock::duration duration;
typedef std::chrono::milliseconds ms;
typedef std::chrono::nanoseconds ns;
void f()
{
time_point t0 = Clock::now();
assert(!m.try_lock());
assert(!m.try_lock());
assert(!m.try_lock());
while(!m.try_lock())
;
time_point t1 = Clock::now();
m.unlock();
ns d = t1 - t0 - ms(250);
assert(d < ms(200)); // within 200ms
}
int main(int, char**)
{
m.lock();
std::thread t(f);
std::this_thread::sleep_for(ms(250));
m.unlock();
t.join();
return 0;
}
|
