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//
// win_iocp_overlapped_ptr.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2008 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/noncopyable.hpp>
#include <boost/asio/detail/win_iocp_io_service.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)
{
}
// 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)
{
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;
}
}
// 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_operation<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, io_service.impl_, handler);
reset();
ptr_ = ptr.release();
}
// 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()
{
OVERLAPPED* tmp = ptr_;
ptr_ = 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_)
{
ptr_->ec_ = ec;
ptr_->io_service_.post_completion(ptr_, 0,
static_cast<DWORD>(bytes_transferred));
ptr_ = 0;
}
}
private:
struct overlapped_operation_base
: public win_iocp_io_service::operation
{
overlapped_operation_base(win_iocp_io_service& io_service,
invoke_func_type invoke_func, destroy_func_type destroy_func)
: win_iocp_io_service::operation(io_service, invoke_func, destroy_func),
io_service_(io_service)
{
io_service_.work_started();
}
~overlapped_operation_base()
{
io_service_.work_finished();
}
win_iocp_io_service& io_service_;
boost::system::error_code ec_;
};
template <typename Handler>
struct overlapped_operation
: public overlapped_operation_base
{
overlapped_operation(win_iocp_io_service& io_service,
Handler handler)
: overlapped_operation_base(io_service,
&overlapped_operation<Handler>::do_completion_impl,
&overlapped_operation<Handler>::destroy_impl),
handler_(handler)
{
}
private:
// Prevent copying and assignment.
overlapped_operation(const overlapped_operation&);
void operator=(const overlapped_operation&);
static void do_completion_impl(win_iocp_io_service::operation* op,
DWORD last_error, size_t bytes_transferred)
{
// Take ownership of the operation object.
typedef overlapped_operation<Handler> op_type;
op_type* handler_op(static_cast<op_type*>(op));
typedef handler_alloc_traits<Handler, op_type> alloc_traits;
handler_ptr<alloc_traits> ptr(handler_op->handler_, handler_op);
// Make a copy of the handler and error_code so that the memory can be
// deallocated before the upcall is made.
Handler handler(handler_op->handler_);
boost::system::error_code ec(handler_op->ec_);
if (last_error)
ec = boost::system::error_code(last_error,
boost::asio::error::get_system_category());
// Free the memory associated with the handler.
ptr.reset();
// Make the upcall.
boost_asio_handler_invoke_helpers::invoke(
bind_handler(handler, ec, bytes_transferred), &handler);
}
static void destroy_impl(win_iocp_io_service::operation* op)
{
// Take ownership of the operation object.
typedef overlapped_operation<Handler> op_type;
op_type* handler_op(static_cast<op_type*>(op));
typedef handler_alloc_traits<Handler, op_type> alloc_traits;
handler_ptr<alloc_traits> ptr(handler_op->handler_, handler_op);
// 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.
Handler handler(handler_op->handler_);
(void)handler;
// Free the memory associated with the handler.
ptr.reset();
}
Handler handler_;
};
overlapped_operation_base* ptr_;
};
} // 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