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// UNSUPPORTED: c++03
11
12// <future>
13
14// class future<R>
15
16// void wait() const;
17
18#include <cassert>
19#include <chrono>
20#include <future>
21#include <ratio>
22
23#include "make_test_thread.h"
24#include "test_macros.h"
25
26void func1(std::promise<int> p)
27{
28 std::this_thread::sleep_for(std::chrono::milliseconds(500));
29 p.set_value(3);
30}
31
32int j = 0;
33
34void func3(std::promise<int&> p)
35{
36 std::this_thread::sleep_for(std::chrono::milliseconds(500));
37 j = 5;
38 p.set_value(j);
39}
40
41void func5(std::promise<void> p)
42{
43 std::this_thread::sleep_for(std::chrono::milliseconds(500));
44 p.set_value();
45}
46
47template <typename T, typename F>
48void test(F func) {
49 typedef std::chrono::high_resolution_clock Clock;
50 typedef std::chrono::duration<double, std::milli> ms;
51
52 std::promise<T> p;
53 std::future<T> f = p.get_future();
54 support::make_test_thread(func, std::move(p)).detach();
55 assert(f.valid());
56 f.wait();
57 assert(f.valid());
58 Clock::time_point t0 = Clock::now();
59 f.wait();
60 Clock::time_point t1 = Clock::now();
61 assert(f.valid());
62 assert(t1-t0 < ms(5));
63}
64
65int main(int, char**)
66{
67 test<int>(func: func1);
68 test<int&>(func: func3);
69 test<void>(func: func5);
70 return 0;
71}
72

source code of libcxx/test/std/thread/futures/futures.unique_future/wait.pass.cpp