reactive_null_buffers_op.hpp
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//
// detail/reactive_null_buffers_op.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2020 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)
//
#ifndef ASIO_DETAIL_REACTIVE_NULL_BUFFERS_OP_HPP
#define ASIO_DETAIL_REACTIVE_NULL_BUFFERS_OP_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include "asio/detail/config.hpp"
#include "asio/detail/bind_handler.hpp"
#include "asio/detail/fenced_block.hpp"
#include "asio/detail/handler_alloc_helpers.hpp"
#include "asio/detail/handler_invoke_helpers.hpp"
#include "asio/detail/handler_work.hpp"
#include "asio/detail/memory.hpp"
#include "asio/detail/reactor_op.hpp"
#include "asio/detail/push_options.hpp"
namespace asio {
namespace detail {
template <typename Handler, typename IoExecutor>
class reactive_null_buffers_op : public reactor_op
{
public:
ASIO_DEFINE_HANDLER_PTR(reactive_null_buffers_op);
reactive_null_buffers_op(const asio::error_code& success_ec,
Handler& handler, const IoExecutor& io_ex)
: reactor_op(success_ec, &reactive_null_buffers_op::do_perform,
&reactive_null_buffers_op::do_complete),
handler_(ASIO_MOVE_CAST(Handler)(handler)),
work_(handler_, io_ex)
{
}
static status do_perform(reactor_op*)
{
return done;
}
static void do_complete(void* owner, operation* base,
const asio::error_code& /*ec*/,
std::size_t /*bytes_transferred*/)
{
// Take ownership of the handler object.
reactive_null_buffers_op* o(static_cast<reactive_null_buffers_op*>(base));
ptr p = { asio::detail::addressof(o->handler_), o, o };
ASIO_HANDLER_COMPLETION((*o));
// Take ownership of the operation's outstanding work.
handler_work<Handler, IoExecutor> w(
ASIO_MOVE_CAST2(handler_work<Handler, IoExecutor>)(
o->work_));
// Make a copy of the handler so that the memory can be deallocated before
// the upcall is made. Even if we're not about to make an upcall, a
// sub-object of the handler may be the true owner of the memory associated
// with the handler. Consequently, a local copy of the handler is required
// to ensure that any owning sub-object remains valid until after we have
// deallocated the memory here.
detail::binder2<Handler, asio::error_code, std::size_t>
handler(o->handler_, o->ec_, o->bytes_transferred_);
p.h = asio::detail::addressof(handler.handler_);
p.reset();
// Make the upcall if required.
if (owner)
{
fenced_block b(fenced_block::half);
ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_));
w.complete(handler, handler.handler_);
ASIO_HANDLER_INVOCATION_END;
}
}
private:
Handler handler_;
handler_work<Handler, IoExecutor> work_;
};
} // namespace detail
} // namespace asio
#include "asio/detail/pop_options.hpp"
#endif // ASIO_DETAIL_REACTIVE_NULL_BUFFERS_OP_HPP