121ed5c198
<stop_token> is not experimental anymore, so its tests shouldn't be guarded by libcpp-has-no-experimental-stop_token.
106 lines
2.4 KiB
C++
106 lines
2.4 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: no-threads
|
|
// UNSUPPORTED: c++03, c++11, c++14, c++17
|
|
// XFAIL: availability-synchronization_library-missing
|
|
|
|
// [[nodiscard]] bool stop_requested() const noexcept;
|
|
// true if *this has ownership of a stop state that has received a stop request; otherwise, false.
|
|
|
|
#include <cassert>
|
|
#include <chrono>
|
|
#include <concepts>
|
|
#include <optional>
|
|
#include <stop_token>
|
|
#include <type_traits>
|
|
|
|
#include "make_test_thread.h"
|
|
#include "test_macros.h"
|
|
|
|
template <class T>
|
|
concept IsStopRequestedNoexcept = requires(const T& t) {
|
|
{ t.stop_requested() } noexcept;
|
|
};
|
|
|
|
static_assert(IsStopRequestedNoexcept<std::stop_source>);
|
|
|
|
int main(int, char**) {
|
|
// no state
|
|
{
|
|
const std::stop_source ss{std::nostopstate};
|
|
assert(!ss.stop_requested());
|
|
}
|
|
|
|
// has state
|
|
{
|
|
std::stop_source ss;
|
|
assert(!ss.stop_requested());
|
|
|
|
ss.request_stop();
|
|
assert(ss.stop_requested());
|
|
}
|
|
|
|
// request from another instance with same state
|
|
{
|
|
std::stop_source ss1;
|
|
auto ss2 = ss1;
|
|
ss2.request_stop();
|
|
assert(ss1.stop_requested());
|
|
}
|
|
|
|
// request from another instance with different state
|
|
{
|
|
std::stop_source ss1;
|
|
std::stop_source ss2;
|
|
|
|
ss2.request_stop();
|
|
assert(!ss1.stop_requested());
|
|
}
|
|
|
|
// multiple threads
|
|
{
|
|
std::stop_source ss;
|
|
|
|
std::thread t = support::make_test_thread([&]() { ss.request_stop(); });
|
|
|
|
t.join();
|
|
assert(ss.stop_requested());
|
|
}
|
|
|
|
// [thread.stopsource.intro] A call to request_stop that returns true
|
|
// synchronizes with a call to stop_requested on an associated stop_source
|
|
// or stop_source object that returns true.
|
|
{
|
|
std::stop_source ss;
|
|
|
|
bool flag = false;
|
|
|
|
std::thread t = support::make_test_thread([&]() {
|
|
using namespace std::chrono_literals;
|
|
std::this_thread::sleep_for(1ms);
|
|
|
|
// happens-before request_stop
|
|
flag = true;
|
|
auto b = ss.request_stop();
|
|
assert(b);
|
|
});
|
|
|
|
while (!ss.stop_requested()) {
|
|
std::this_thread::yield();
|
|
}
|
|
|
|
// write should be visible to the current thread
|
|
assert(flag == true);
|
|
|
|
t.join();
|
|
}
|
|
|
|
return 0;
|
|
}
|