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//
// detail/win_iocp_overlapped_ptr.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_PTR_HPP
#define ASIO_DETAIL_WIN_IOCP_OVERLAPPED_PTR_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/io_context.hpp"
#include "asio/detail/handler_alloc_helpers.hpp"
#include "asio/detail/memory.hpp"
#include "asio/detail/noncopyable.hpp"
#include "asio/detail/win_iocp_overlapped_op.hpp"
#include "asio/detail/win_iocp_io_context.hpp"
#include "asio/detail/push_options.hpp"
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(
asio::io_context& io_context, ASIO_MOVE_ARG(Handler) handler)
: ptr_(0),
iocp_service_(0)
{
this->reset(io_context, ASIO_MOVE_CAST(Handler)(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(asio::io_context& io_context, Handler handler)
{
typedef win_iocp_overlapped_op<Handler> op;
typename op::ptr p = { asio::detail::addressof(handler),
op::ptr::allocate(handler), 0 };
p.p = new (p.v) op(handler);
ASIO_HANDLER_CREATION((io_context, *p.p,
"io_context", &io_context.impl_, 0, "overlapped"));
io_context.impl_.work_started();
reset();
ptr_ = p.p;
p.v = p.p = 0;
iocp_service_ = &io_context.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 asio::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:
win_iocp_operation* ptr_;
win_iocp_io_context* iocp_service_;
};
} // namespace detail
} // namespace asio
#include "asio/detail/pop_options.hpp"
#endif // defined(ASIO_HAS_IOCP)
#endif // ASIO_DETAIL_WIN_IOCP_OVERLAPPED_PTR_HPP
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