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_any;
15
16// template <class Lock, class Rep, class Period, class Predicate>
17// bool
18// wait_for(Lock& lock, const chrono::duration<Rep, Period>& rel_time,
19// Predicate pred);
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
30class Pred
31{
32 int& i_;
33public:
34 explicit Pred(int& i) : i_(i) {}
35
36 bool operator()() {return i_ != 0;}
37};
38
39std::condition_variable_any cv;
40
41typedef std::timed_mutex L0;
42typedef std::unique_lock<L0> L1;
43
44L0 m0;
45
46int test1 = 0;
47int test2 = 0;
48
49int runs = 0;
50bool expect_result = false;
51
52void f()
53{
54 typedef std::chrono::system_clock Clock;
55 typedef std::chrono::milliseconds milliseconds;
56 L1 lk(m0);
57 assert(test2 == 0);
58 test1 = 1;
59 cv.notify_one();
60 Clock::time_point t0 = Clock::now();
61 bool result = cv.wait_for(lock&: lk, rtime: milliseconds(250), p: Pred(test2));
62 assert(result == expect_result);
63 Clock::time_point t1 = Clock::now();
64 if (runs == 0)
65 {
66 assert(t1 - t0 < milliseconds(250));
67 assert(test2 != 0);
68 }
69 else
70 {
71 assert(t1 - t0 - milliseconds(250) < milliseconds(50));
72 assert(test2 == 0);
73 }
74 ++runs;
75}
76
77int main(int, char**)
78{
79 {
80 expect_result = true;
81 L1 lk(m0);
82 std::thread t = support::make_test_thread(f);
83 assert(test1 == 0);
84 while (test1 == 0)
85 cv.wait(lock&: lk);
86 assert(test1 != 0);
87 test2 = 1;
88 lk.unlock();
89 cv.notify_one();
90 t.join();
91 }
92 test1 = 0;
93 test2 = 0;
94 {
95 expect_result = false;
96 L1 lk(m0);
97 std::thread t = support::make_test_thread(f);
98 assert(test1 == 0);
99 while (test1 == 0)
100 cv.wait(lock&: lk);
101 assert(test1 != 0);
102 lk.unlock();
103 t.join();
104 }
105
106 return 0;
107}
108

source code of libcxx/test/std/thread/thread.condition/thread.condition.condvarany/wait_for_pred.pass.cpp