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//
// co_spawn.cpp
// ~~~~~~~~~~~~
//
// Copyright (c) 2003-2025 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
// Disable autolinking for unit tests.
#if !defined(BOOST_ALL_NO_LIB)
#define BOOST_ALL_NO_LIB 1
#endif // !defined(BOOST_ALL_NO_LIB)
// Test that header file is self-contained.
#include <boost/asio/co_spawn.hpp>
#include "unit_test.hpp"
#if defined(BOOST_ASIO_HAS_CO_AWAIT)
#include <stdexcept>
#include <boost/asio/any_completion_handler.hpp>
#include <boost/asio/bind_cancellation_slot.hpp>
#include <boost/asio/dispatch.hpp>
#include <boost/asio/io_context.hpp>
#include <boost/asio/use_awaitable.hpp>
boost::asio::awaitable<void> void_returning_coroutine()
{
co_return;
}
boost::asio::awaitable<int> int_returning_coroutine()
{
co_return 42;
}
void test_co_spawn_with_any_completion_handler()
{
boost::asio::io_context ctx;
bool called = false;
boost::asio::co_spawn(ctx, void_returning_coroutine(),
boost::asio::any_completion_handler<void(std::exception_ptr)>(
[&](std::exception_ptr)
{
called = true;
}));
BOOST_ASIO_CHECK(!called);
ctx.run();
BOOST_ASIO_CHECK(called);
int result = 0;
boost::asio::co_spawn(ctx, int_returning_coroutine(),
boost::asio::any_completion_handler<void(std::exception_ptr, int)>(
[&](std::exception_ptr, int i)
{
result = i;
}));
BOOST_ASIO_CHECK(result == 0);
ctx.restart();
ctx.run();
BOOST_ASIO_CHECK(result == 42);
}
void test_co_spawn_immediate_cancel()
{
boost::asio::cancellation_signal sig;
boost::asio::io_context ctx;
std::exception_ptr result = nullptr;
bool called = false;
boost::asio::co_spawn(ctx, void_returning_coroutine(),
boost::asio::bind_cancellation_slot(sig.slot(),
[&](std::exception_ptr e)
{
result = e;
called = true;
}));
BOOST_ASIO_CHECK(!called);
BOOST_ASIO_CHECK(result == nullptr);
sig.emit(boost::asio::cancellation_type::all);
ctx.run();
BOOST_ASIO_CHECK(called);
BOOST_ASIO_CHECK(result != nullptr);
result = nullptr;
called = false;
boost::asio::co_spawn(ctx, int_returning_coroutine(),
boost::asio::bind_cancellation_slot(sig.slot(),
[&](std::exception_ptr e, int i)
{
BOOST_ASIO_CHECK(i != 42);
result = e;
called = true;
}));
BOOST_ASIO_CHECK(!called);
BOOST_ASIO_CHECK(result == nullptr);
sig.emit(boost::asio::cancellation_type::all);
ctx.restart();
ctx.run();
BOOST_ASIO_CHECK(called);
BOOST_ASIO_CHECK(result != nullptr);
}
boost::asio::awaitable<void> void_returning_dispatch_coroutine()
{
co_await boost::asio::dispatch(boost::asio::use_awaitable);
co_return;
}
boost::asio::awaitable<int> int_returning_dispatch_coroutine()
{
co_await boost::asio::dispatch(boost::asio::use_awaitable);
co_return 42;
}
void test_co_spawn_with_immediate_completion_via_dispatch()
{
boost::asio::io_context ctx;
bool called = false;
boost::asio::post(ctx,
[&]
{
boost::asio::co_spawn(ctx, void_returning_dispatch_coroutine(),
[&](std::exception_ptr)
{
called = true;
});
BOOST_ASIO_CHECK(!called);
});
ctx.run();
BOOST_ASIO_CHECK(called);
int result = 0;
boost::asio::post(ctx,
[&]
{
boost::asio::co_spawn(ctx, int_returning_dispatch_coroutine(),
[&](std::exception_ptr, int i)
{
result = i;
});
BOOST_ASIO_CHECK(result == 0);
});
ctx.restart();
ctx.run();
BOOST_ASIO_CHECK(result == 42);
}
BOOST_ASIO_TEST_SUITE
(
"co_spawn",
BOOST_ASIO_TEST_CASE(test_co_spawn_with_any_completion_handler)
BOOST_ASIO_TEST_CASE(test_co_spawn_immediate_cancel)
BOOST_ASIO_TEST_CASE(test_co_spawn_with_immediate_completion_via_dispatch)
)
#else // defined(BOOST_ASIO_HAS_CO_AWAIT)
BOOST_ASIO_TEST_SUITE
(
"co_spawn",
BOOST_ASIO_TEST_CASE(null_test)
)
#endif // defined(BOOST_ASIO_HAS_CO_AWAIT)
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