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//
// detail/reactive_socket_recvfrom_op.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2018 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_SOCKET_RECVFROM_OP_HPP
#define ASIO_DETAIL_REACTIVE_SOCKET_RECVFROM_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/buffer_sequence_adapter.hpp"
#include "asio/detail/fenced_block.hpp"
#include "asio/detail/memory.hpp"
#include "asio/detail/reactor_op.hpp"
#include "asio/detail/socket_ops.hpp"
#include "asio/detail/push_options.hpp"
namespace asio {
namespace detail {
template <typename MutableBufferSequence, typename Endpoint>
class reactive_socket_recvfrom_op_base : public reactor_op
{
public:
reactive_socket_recvfrom_op_base(socket_type socket, int protocol_type,
const MutableBufferSequence& buffers, Endpoint& endpoint,
socket_base::message_flags flags, func_type complete_func)
: reactor_op(&reactive_socket_recvfrom_op_base::do_perform, complete_func),
socket_(socket),
protocol_type_(protocol_type),
buffers_(buffers),
sender_endpoint_(endpoint),
flags_(flags)
{
}
static status do_perform(reactor_op* base)
{
reactive_socket_recvfrom_op_base* o(
static_cast<reactive_socket_recvfrom_op_base*>(base));
buffer_sequence_adapter<asio::mutable_buffer,
MutableBufferSequence> bufs(o->buffers_);
std::size_t addr_len = o->sender_endpoint_.capacity();
status result = socket_ops::non_blocking_recvfrom(o->socket_,
bufs.buffers(), bufs.count(), o->flags_,
o->sender_endpoint_.data(), &addr_len,
o->ec_, o->bytes_transferred_) ? done : not_done;
if (result && !o->ec_)
o->sender_endpoint_.resize(addr_len);
ASIO_HANDLER_REACTOR_OPERATION((*o, "non_blocking_recvfrom",
o->ec_, o->bytes_transferred_));
return result;
}
private:
socket_type socket_;
int protocol_type_;
MutableBufferSequence buffers_;
Endpoint& sender_endpoint_;
socket_base::message_flags flags_;
};
template <typename MutableBufferSequence, typename Endpoint, typename Handler>
class reactive_socket_recvfrom_op :
public reactive_socket_recvfrom_op_base<MutableBufferSequence, Endpoint>
{
public:
ASIO_DEFINE_HANDLER_PTR(reactive_socket_recvfrom_op);
reactive_socket_recvfrom_op(socket_type socket, int protocol_type,
const MutableBufferSequence& buffers, Endpoint& endpoint,
socket_base::message_flags flags, Handler& handler)
: reactive_socket_recvfrom_op_base<MutableBufferSequence, Endpoint>(
socket, protocol_type, buffers, endpoint, flags,
&reactive_socket_recvfrom_op::do_complete),
handler_(ASIO_MOVE_CAST(Handler)(handler))
{
handler_work<Handler>::start(handler_);
}
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_socket_recvfrom_op* o(
static_cast<reactive_socket_recvfrom_op*>(base));
ptr p = { asio::detail::addressof(o->handler_), o, o };
handler_work<Handler> w(o->handler_);
ASIO_HANDLER_COMPLETION((*o));
// 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_;
};
} // namespace detail
} // namespace asio
#include "asio/detail/pop_options.hpp"
#endif // ASIO_DETAIL_REACTIVE_SOCKET_RECVFROM_OP_HPP
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