wait.pass.cpp
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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// UNSUPPORTED: libcpp-has-no-threads
// UNSUPPORTED: c++98, c++03
// <future>
// class shared_future<R>
// void wait() const;
#include <future>
#include <cassert>
#include "test_macros.h"
void func1(std::promise<int> p)
{
std::this_thread::sleep_for(std::chrono::milliseconds(500));
p.set_value(3);
}
int j = 0;
void func3(std::promise<int&> p)
{
std::this_thread::sleep_for(std::chrono::milliseconds(500));
j = 5;
p.set_value(j);
}
void func5(std::promise<void> p)
{
std::this_thread::sleep_for(std::chrono::milliseconds(500));
p.set_value();
}
int main(int, char**)
{
typedef std::chrono::high_resolution_clock Clock;
typedef std::chrono::duration<double, std::milli> ms;
{
typedef int T;
std::promise<T> p;
std::shared_future<T> f = p.get_future();
std::thread(func1, std::move(p)).detach();
assert(f.valid());
f.wait();
assert(f.valid());
Clock::time_point t0 = Clock::now();
f.wait();
Clock::time_point t1 = Clock::now();
assert(f.valid());
assert(t1-t0 < ms(5));
}
{
typedef int& T;
std::promise<T> p;
std::shared_future<T> f = p.get_future();
std::thread(func3, std::move(p)).detach();
assert(f.valid());
f.wait();
assert(f.valid());
Clock::time_point t0 = Clock::now();
f.wait();
Clock::time_point t1 = Clock::now();
assert(f.valid());
assert(t1-t0 < ms(5));
}
{
typedef void T;
std::promise<T> p;
std::shared_future<T> f = p.get_future();
std::thread(func5, std::move(p)).detach();
assert(f.valid());
f.wait();
assert(f.valid());
Clock::time_point t0 = Clock::now();
f.wait();
Clock::time_point t1 = Clock::now();
assert(f.valid());
assert(t1-t0 < ms(5));
}
return 0;
}