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//
// win_iocp_overlapped_ptr.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2010 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 BOOST_ASIO_DETAIL_WIN_IOCP_OVERLAPPED_PTR_HPP
#define BOOST_ASIO_DETAIL_WIN_IOCP_OVERLAPPED_PTR_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include <boost/asio/detail/push_options.hpp>
#include <boost/asio/detail/win_iocp_io_service_fwd.hpp>
#if defined(BOOST_ASIO_HAS_IOCP)
#include <boost/asio/detail/fenced_block.hpp>
#include <boost/asio/detail/noncopyable.hpp>
#include <boost/asio/detail/win_iocp_io_service.hpp>
#include <boost/asio/detail/win_iocp_operation.hpp>
namespace boost {
namespace asio {
namespace detail {
// Wraps a handler to create an OVERLAPPED object for use with overlapped I/O.
class win_iocp_overlapped_ptr
: private noncopyable
{
public:
// Construct an empty win_iocp_overlapped_ptr.
win_iocp_overlapped_ptr()
: ptr_(0),
iocp_service_(0)
{
}
// Construct an win_iocp_overlapped_ptr to contain the specified handler.
template <typename Handler>
explicit win_iocp_overlapped_ptr(
boost::asio::io_service& io_service, Handler handler)
: ptr_(0),
iocp_service_(0)
{
this->reset(io_service, handler);
}
// Destructor automatically frees the OVERLAPPED object unless released.
~win_iocp_overlapped_ptr()
{
reset();
}
// Reset to empty.
void reset()
{
if (ptr_)
{
ptr_->destroy();
ptr_ = 0;
iocp_service_->work_finished();
iocp_service_ = 0;
}
}
// Reset to contain the specified handler, freeing any current OVERLAPPED
// object.
template <typename Handler>
void reset(boost::asio::io_service& io_service, Handler handler)
{
typedef overlapped_op<Handler> value_type;
typedef handler_alloc_traits<Handler, value_type> alloc_traits;
raw_handler_ptr<alloc_traits> raw_ptr(handler);
handler_ptr<alloc_traits> ptr(raw_ptr, handler);
io_service.impl_.work_started();
reset();
ptr_ = ptr.release();
iocp_service_ = &io_service.impl_;
}
// Get the contained OVERLAPPED object.
OVERLAPPED* get()
{
return ptr_;
}
// Get the contained OVERLAPPED object.
const OVERLAPPED* get() const
{
return ptr_;
}
// Release ownership of the OVERLAPPED object.
OVERLAPPED* release()
{
if (ptr_)
iocp_service_->on_pending(ptr_);
OVERLAPPED* tmp = ptr_;
ptr_ = 0;
iocp_service_ = 0;
return tmp;
}
// Post completion notification for overlapped operation. Releases ownership.
void complete(const boost::system::error_code& ec,
std::size_t bytes_transferred)
{
if (ptr_)
{
iocp_service_->on_completion(ptr_, ec,
static_cast<DWORD>(bytes_transferred));
ptr_ = 0;
iocp_service_ = 0;
}
}
private:
template <typename Handler>
struct overlapped_op : public win_iocp_operation
{
overlapped_op(Handler handler)
: win_iocp_operation(&overlapped_op::do_complete),
handler_(handler)
{
}
static void do_complete(io_service_impl* owner, operation* base,
boost::system::error_code ec, std::size_t bytes_transferred)
{
// Take ownership of the operation object.
overlapped_op* o(static_cast<overlapped_op*>(base));
typedef handler_alloc_traits<Handler, overlapped_op> alloc_traits;
handler_ptr<alloc_traits> ptr(o->handler_, o);
// Make the upcall if required.
if (owner)
{
// 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, boost::system::error_code, std::size_t>
handler(o->handler_, ec, bytes_transferred);
ptr.reset();
boost::asio::detail::fenced_block b;
boost_asio_handler_invoke_helpers::invoke(handler, handler);
}
}
private:
Handler handler_;
};
win_iocp_operation* ptr_;
win_iocp_io_service* iocp_service_;
};
} // namespace detail
} // namespace asio
} // namespace boost
#endif // defined(BOOST_ASIO_HAS_IOCP)
#include <boost/asio/detail/pop_options.hpp>
#endif // BOOST_ASIO_DETAIL_WIN_IOCP_OVERLAPPED_PTR_HPP
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Swift