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//
// detail/win_iocp_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_WIN_IOCP_SOCKET_RECVFROM_OP_HPP
#define ASIO_DETAIL_WIN_IOCP_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"
#if defined(ASIO_HAS_IOCP)
#include "asio/detail/bind_handler.hpp"
#include "asio/detail/buffer_sequence_adapter.hpp"
#include "asio/detail/fenced_block.hpp"
#include "asio/detail/handler_alloc_helpers.hpp"
#include "asio/detail/handler_invoke_helpers.hpp"
#include "asio/detail/memory.hpp"
#include "asio/detail/operation.hpp"
#include "asio/detail/socket_ops.hpp"
#include "asio/error.hpp"
#include "asio/detail/push_options.hpp"
namespace asio {
namespace detail {
template <typename MutableBufferSequence, typename Endpoint, typename Handler>
class win_iocp_socket_recvfrom_op : public operation
{
public:
ASIO_DEFINE_HANDLER_PTR(win_iocp_socket_recvfrom_op);
win_iocp_socket_recvfrom_op(Endpoint& endpoint,
socket_ops::weak_cancel_token_type cancel_token,
const MutableBufferSequence& buffers, Handler& handler)
: operation(&win_iocp_socket_recvfrom_op::do_complete),
endpoint_(endpoint),
endpoint_size_(static_cast<int>(endpoint.capacity())),
cancel_token_(cancel_token),
buffers_(buffers),
handler_(ASIO_MOVE_CAST(Handler)(handler))
{
handler_work<Handler>::start(handler_);
}
int& endpoint_size()
{
return endpoint_size_;
}
static void do_complete(void* owner, operation* base,
const asio::error_code& result_ec,
std::size_t bytes_transferred)
{
asio::error_code ec(result_ec);
// Take ownership of the operation object.
win_iocp_socket_recvfrom_op* o(
static_cast<win_iocp_socket_recvfrom_op*>(base));
ptr p = { asio::detail::addressof(o->handler_), o, o };
handler_work<Handler> w(o->handler_);
ASIO_HANDLER_COMPLETION((*o));
#if defined(ASIO_ENABLE_BUFFER_DEBUGGING)
// Check whether buffers are still valid.
if (owner)
{
buffer_sequence_adapter<asio::mutable_buffer,
MutableBufferSequence>::validate(o->buffers_);
}
#endif // defined(ASIO_ENABLE_BUFFER_DEBUGGING)
socket_ops::complete_iocp_recvfrom(o->cancel_token_, ec);
// Record the size of the endpoint returned by the operation.
o->endpoint_.resize(o->endpoint_size_);
// 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_, ec, 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:
Endpoint& endpoint_;
int endpoint_size_;
socket_ops::weak_cancel_token_type cancel_token_;
MutableBufferSequence buffers_;
Handler handler_;
};
} // namespace detail
} // namespace asio
#include "asio/detail/pop_options.hpp"
#endif // defined(ASIO_HAS_IOCP)
#endif // ASIO_DETAIL_WIN_IOCP_SOCKET_RECVFROM_OP_HPP
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