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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: no-threads
// UNSUPPORTED: libcpp-has-no-experimental-stop_token
// UNSUPPORTED: c++03, c++11, c++14, c++17
// XFAIL: availability-synchronization_library-missing
// bool request_stop() noexcept;
#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 IsRequestStopNoexcept = requires(T& t) {
{ t.request_stop() } noexcept;
};
static_assert(IsRequestStopNoexcept<std::stop_source>);
int main(int, char**) {
// If *this does not have ownership of a stop state, returns false
{
std::stop_source ss{std::nostopstate};
auto ret = ss.request_stop();
assert(!ret);
assert(!ss.stop_requested());
}
// Otherwise, atomically determines whether the owned stop state has received
// a stop request, and if not, makes a stop request
{
std::stop_source ss;
auto ret = ss.request_stop();
assert(ret);
assert(ss.stop_requested());
}
// already requested
{
std::stop_source ss;
ss.request_stop();
assert(ss.stop_requested());
auto ret = ss.request_stop();
assert(!ret);
assert(ss.stop_requested());
}
// If the request was made, the callbacks registered by
// associated stop_callback objects are synchronously called.
{
std::stop_source ss;
auto st = ss.get_token();
bool cb1Called = false;
bool cb2Called = false;
std::stop_callback sc1(st, [&] { cb1Called = true; });
std::stop_callback sc2(st, [&] { cb2Called = true; });
ss.request_stop();
assert(cb1Called);
assert(cb2Called);
}
return 0;
}
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