127 lines
3.6 KiB
C++
127 lines
3.6 KiB
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// 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++03
|
|
|
|
// <future>
|
|
|
|
// class future<R>
|
|
|
|
// template <class Clock, class Duration>
|
|
// future_status
|
|
// wait_until(const chrono::time_point<Clock, Duration>& abs_time) const;
|
|
|
|
#include <future>
|
|
#include <atomic>
|
|
#include <cassert>
|
|
|
|
#include "make_test_thread.h"
|
|
#include "test_macros.h"
|
|
|
|
enum class WorkerThreadState { Uninitialized, AllowedToRun, Exiting };
|
|
typedef std::chrono::milliseconds ms;
|
|
|
|
std::atomic<WorkerThreadState> thread_state(WorkerThreadState::Uninitialized);
|
|
|
|
void set_worker_thread_state(WorkerThreadState state)
|
|
{
|
|
thread_state.store(state, std::memory_order_relaxed);
|
|
}
|
|
|
|
void wait_for_worker_thread_state(WorkerThreadState state)
|
|
{
|
|
while (thread_state.load(std::memory_order_relaxed) != state)
|
|
std::this_thread::yield();
|
|
}
|
|
|
|
void func1(std::promise<int> p)
|
|
{
|
|
wait_for_worker_thread_state(WorkerThreadState::AllowedToRun);
|
|
p.set_value(3);
|
|
set_worker_thread_state(WorkerThreadState::Exiting);
|
|
}
|
|
|
|
int j = 0;
|
|
|
|
void func3(std::promise<int&> p)
|
|
{
|
|
wait_for_worker_thread_state(WorkerThreadState::AllowedToRun);
|
|
j = 5;
|
|
p.set_value(j);
|
|
set_worker_thread_state(WorkerThreadState::Exiting);
|
|
}
|
|
|
|
void func5(std::promise<void> p)
|
|
{
|
|
wait_for_worker_thread_state(WorkerThreadState::AllowedToRun);
|
|
p.set_value();
|
|
set_worker_thread_state(WorkerThreadState::Exiting);
|
|
}
|
|
|
|
int main(int, char**)
|
|
{
|
|
typedef std::chrono::high_resolution_clock Clock;
|
|
{
|
|
typedef int T;
|
|
std::promise<T> p;
|
|
std::future<T> f = p.get_future();
|
|
support::make_test_thread(func1, std::move(p)).detach();
|
|
assert(f.valid());
|
|
assert(f.wait_until(Clock::now() + ms(10)) == std::future_status::timeout);
|
|
assert(f.valid());
|
|
|
|
// allow the worker thread to produce the result and wait until the worker is done
|
|
set_worker_thread_state(WorkerThreadState::AllowedToRun);
|
|
wait_for_worker_thread_state(WorkerThreadState::Exiting);
|
|
|
|
assert(f.wait_until(Clock::now() + ms(10)) == std::future_status::ready);
|
|
assert(f.valid());
|
|
f.wait();
|
|
assert(f.valid());
|
|
}
|
|
{
|
|
typedef int& T;
|
|
std::promise<T> p;
|
|
std::future<T> f = p.get_future();
|
|
support::make_test_thread(func3, std::move(p)).detach();
|
|
assert(f.valid());
|
|
assert(f.wait_until(Clock::now() + ms(10)) == std::future_status::timeout);
|
|
assert(f.valid());
|
|
|
|
// allow the worker thread to produce the result and wait until the worker is done
|
|
set_worker_thread_state(WorkerThreadState::AllowedToRun);
|
|
wait_for_worker_thread_state(WorkerThreadState::Exiting);
|
|
|
|
assert(f.wait_until(Clock::now() + ms(10)) == std::future_status::ready);
|
|
assert(f.valid());
|
|
f.wait();
|
|
assert(f.valid());
|
|
}
|
|
{
|
|
typedef void T;
|
|
std::promise<T> p;
|
|
std::future<T> f = p.get_future();
|
|
support::make_test_thread(func5, std::move(p)).detach();
|
|
assert(f.valid());
|
|
assert(f.wait_until(Clock::now() + ms(10)) == std::future_status::timeout);
|
|
assert(f.valid());
|
|
|
|
// allow the worker thread to produce the result and wait until the worker is done
|
|
set_worker_thread_state(WorkerThreadState::AllowedToRun);
|
|
wait_for_worker_thread_state(WorkerThreadState::Exiting);
|
|
|
|
assert(f.wait_until(Clock::now() + ms(10)) == std::future_status::ready);
|
|
assert(f.valid());
|
|
f.wait();
|
|
assert(f.valid());
|
|
}
|
|
|
|
return 0;
|
|
}
|