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 Predicate>
17// void wait(unique_lock<mutex>& lock, Predicate pred);
18
19#include <condition_variable>
20#include <mutex>
21#include <thread>
22#include <functional>
23#include <cassert>
24
25#include "make_test_thread.h"
26#include "test_macros.h"
27
28std::condition_variable cv;
29std::mutex mut;
30
31int test1 = 0;
32int test2 = 0;
33
34class Pred
35{
36 int& i_;
37public:
38 explicit Pred(int& i) : i_(i) {}
39
40 bool operator()() {return i_ != 0;}
41};
42
43void f()
44{
45 std::unique_lock<std::mutex> lk(mut);
46 assert(test2 == 0);
47 test1 = 1;
48 cv.notify_one();
49 cv.wait(lock&: lk, p: Pred(test2));
50 assert(test2 != 0);
51}
52
53int main(int, char**)
54{
55 std::unique_lock<std::mutex>lk(mut);
56 std::thread t = support::make_test_thread(f);
57 assert(test1 == 0);
58 while (test1 == 0)
59 cv.wait(lock&: lk);
60 assert(test1 != 0);
61 test2 = 1;
62 lk.unlock();
63 cv.notify_one();
64 t.join();
65
66 return 0;
67}
68

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