96 lines · cpp
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-exception6//7//===----------------------------------------------------------------------===//8//9// UNSUPPORTED: no-threads10// UNSUPPORTED: c++0311 12// <future>13 14// class shared_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 47int main(int, char**)48{49 typedef std::chrono::high_resolution_clock Clock;50 typedef std::chrono::duration<double, std::milli> ms;51 {52 typedef int T;53 std::promise<T> p;54 std::shared_future<T> f = p.get_future();55 support::make_test_thread(func1, std::move(p)).detach();56 assert(f.valid());57 f.wait();58 assert(f.valid());59 Clock::time_point t0 = Clock::now();60 f.wait();61 Clock::time_point t1 = Clock::now();62 assert(f.valid());63 assert(t1-t0 < ms(5));64 }65 {66 typedef int& T;67 std::promise<T> p;68 std::shared_future<T> f = p.get_future();69 support::make_test_thread(func3, std::move(p)).detach();70 assert(f.valid());71 f.wait();72 assert(f.valid());73 Clock::time_point t0 = Clock::now();74 f.wait();75 Clock::time_point t1 = Clock::now();76 assert(f.valid());77 assert(t1-t0 < ms(5));78 }79 {80 typedef void T;81 std::promise<T> p;82 std::shared_future<T> f = p.get_future();83 support::make_test_thread(func5, std::move(p)).detach();84 assert(f.valid());85 f.wait();86 assert(f.valid());87 Clock::time_point t0 = Clock::now();88 f.wait();89 Clock::time_point t1 = Clock::now();90 assert(f.valid());91 assert(t1-t0 < ms(5));92 }93 94 return 0;95}96