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: no-threads
10// ALLOW_RETRIES: 2
11
12// <condition_variable>
13
14// class condition_variable;
15
16// template <class Rep, class Period>
17// cv_status
18// wait_for(unique_lock<mutex>& lock,
19// const chrono::duration<Rep, Period>& rel_time);
20
21#include <condition_variable>
22#include <mutex>
23#include <thread>
24#include <chrono>
25#include <cassert>
26
27#include "make_test_thread.h"
28#include "test_macros.h"
29
30std::condition_variable cv;
31std::mutex mut;
32
33int test1 = 0;
34int test2 = 0;
35
36bool expect_timeout = false;
37
38void f()
39{
40 typedef std::chrono::system_clock Clock;
41 typedef std::chrono::milliseconds milliseconds;
42 std::unique_lock<std::mutex> lk(mut);
43 assert(test2 == 0);
44 test1 = 1;
45 cv.notify_one();
46 Clock::time_point t0 = Clock::now();
47 Clock::time_point wait_end = t0 + milliseconds(250);
48 Clock::duration d;
49 do {
50 d = wait_end - Clock::now();
51 if (d <= milliseconds(0)) break;
52 } while (test2 == 0 && cv.wait_for(lock&: lk, rtime: d) == std::cv_status::no_timeout);
53 Clock::time_point t1 = Clock::now();
54 if (!expect_timeout)
55 {
56 assert(t1 - t0 < milliseconds(250));
57 assert(test2 != 0);
58 }
59 else
60 {
61 assert(t1 - t0 - milliseconds(250) < milliseconds(50));
62 assert(test2 == 0);
63 }
64}
65
66int main(int, char**)
67{
68 {
69 std::unique_lock<std::mutex> lk(mut);
70 std::thread t = support::make_test_thread(f);
71 assert(test1 == 0);
72 while (test1 == 0)
73 cv.wait(lock&: lk);
74 assert(test1 != 0);
75 test2 = 1;
76 lk.unlock();
77 cv.notify_one();
78 t.join();
79 }
80 test1 = 0;
81 test2 = 0;
82 expect_timeout = true;
83 {
84 std::unique_lock<std::mutex> lk(mut);
85 std::thread t = support::make_test_thread(f);
86 assert(test1 == 0);
87 while (test1 == 0)
88 cv.wait(lock&: lk);
89 assert(test1 != 0);
90 lk.unlock();
91 t.join();
92 }
93
94 return 0;
95}
96

source code of libcxx/test/std/thread/thread.condition/thread.condition.condvar/wait_for.pass.cpp