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//
// detail/win_iocp_overlapped_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_OVERLAPPED_OP_HPP
#define ASIO_DETAIL_WIN_IOCP_OVERLAPPED_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/error.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/memory.hpp"
#include "asio/detail/operation.hpp"
#include "asio/detail/push_options.hpp"
namespace asio {
namespace detail {
template <typename Handler>
class win_iocp_overlapped_op : public operation
{
public:
ASIO_DEFINE_HANDLER_PTR(win_iocp_overlapped_op);
win_iocp_overlapped_op(Handler& handler)
: operation(&win_iocp_overlapped_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 operation object.
win_iocp_overlapped_op* o(static_cast<win_iocp_overlapped_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_, 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:
Handler handler_;
};
} // namespace detail
} // namespace asio
#include "asio/detail/pop_options.hpp"
#endif // defined(ASIO_HAS_IOCP)
#endif // ASIO_DETAIL_WIN_IOCP_OVERLAPPED_OP_HPP
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