172 lines
4.1 KiB
C++
172 lines
4.1 KiB
C++
//
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// detail/win_iocp_overlapped_ptr.hpp
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// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com)
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef ASIO_DETAIL_WIN_IOCP_OVERLAPPED_PTR_HPP
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#define ASIO_DETAIL_WIN_IOCP_OVERLAPPED_PTR_HPP
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#if defined(_MSC_VER) && (_MSC_VER >= 1200)
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# pragma once
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#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
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#include "asio/detail/config.hpp"
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#if defined(ASIO_HAS_IOCP)
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#include "asio/io_context.hpp"
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#include "asio/query.hpp"
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#include "asio/detail/handler_alloc_helpers.hpp"
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#include "asio/detail/memory.hpp"
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#include "asio/detail/noncopyable.hpp"
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#include "asio/detail/win_iocp_overlapped_op.hpp"
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#include "asio/detail/win_iocp_io_context.hpp"
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#include "asio/detail/push_options.hpp"
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namespace asio {
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namespace detail {
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// Wraps a handler to create an OVERLAPPED object for use with overlapped I/O.
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class win_iocp_overlapped_ptr
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: private noncopyable
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{
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public:
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// Construct an empty win_iocp_overlapped_ptr.
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win_iocp_overlapped_ptr()
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: ptr_(0),
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iocp_service_(0)
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{
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}
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// Construct an win_iocp_overlapped_ptr to contain the specified handler.
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template <typename Executor, typename Handler>
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explicit win_iocp_overlapped_ptr(const Executor& ex,
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ASIO_MOVE_ARG(Handler) handler)
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: ptr_(0),
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iocp_service_(0)
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{
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this->reset(ex, ASIO_MOVE_CAST(Handler)(handler));
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}
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// Destructor automatically frees the OVERLAPPED object unless released.
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~win_iocp_overlapped_ptr()
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{
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reset();
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}
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// Reset to empty.
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void reset()
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{
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if (ptr_)
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{
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ptr_->destroy();
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ptr_ = 0;
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iocp_service_->work_finished();
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iocp_service_ = 0;
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}
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}
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// Reset to contain the specified handler, freeing any current OVERLAPPED
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// object.
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template <typename Executor, typename Handler>
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void reset(const Executor& ex, Handler handler)
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{
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win_iocp_io_context* iocp_service = this->get_iocp_service(ex);
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typedef win_iocp_overlapped_op<Handler, Executor> op;
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typename op::ptr p = { asio::detail::addressof(handler),
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op::ptr::allocate(handler), 0 };
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p.p = new (p.v) op(handler, ex);
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ASIO_HANDLER_CREATION((ex.context(), *p.p,
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"iocp_service", iocp_service, 0, "overlapped"));
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iocp_service->work_started();
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reset();
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ptr_ = p.p;
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p.v = p.p = 0;
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iocp_service_ = iocp_service;
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}
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// Get the contained OVERLAPPED object.
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OVERLAPPED* get()
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{
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return ptr_;
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}
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// Get the contained OVERLAPPED object.
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const OVERLAPPED* get() const
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{
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return ptr_;
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}
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// Release ownership of the OVERLAPPED object.
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OVERLAPPED* release()
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{
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if (ptr_)
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iocp_service_->on_pending(ptr_);
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OVERLAPPED* tmp = ptr_;
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ptr_ = 0;
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iocp_service_ = 0;
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return tmp;
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}
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// Post completion notification for overlapped operation. Releases ownership.
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void complete(const asio::error_code& ec,
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std::size_t bytes_transferred)
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{
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if (ptr_)
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{
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iocp_service_->on_completion(ptr_, ec,
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static_cast<DWORD>(bytes_transferred));
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ptr_ = 0;
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iocp_service_ = 0;
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}
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}
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private:
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template <typename Executor>
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static win_iocp_io_context* get_iocp_service(const Executor& ex,
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typename enable_if<
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can_query<const Executor&, execution::context_t>::value
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>::type* = 0)
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{
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return &use_service<win_iocp_io_context>(
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asio::query(ex, execution::context));
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}
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template <typename Executor>
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static win_iocp_io_context* get_iocp_service(const Executor& ex,
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typename enable_if<
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!can_query<const Executor&, execution::context_t>::value
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>::type* = 0)
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{
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return &use_service<win_iocp_io_context>(ex.context());
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}
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static win_iocp_io_context* get_iocp_service(
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const io_context::executor_type& ex)
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{
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return &asio::query(ex, execution::context).impl_;
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}
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win_iocp_operation* ptr_;
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win_iocp_io_context* iocp_service_;
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};
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} // namespace detail
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} // namespace asio
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#include "asio/detail/pop_options.hpp"
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#endif // defined(ASIO_HAS_IOCP)
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#endif // ASIO_DETAIL_WIN_IOCP_OVERLAPPED_PTR_HPP
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