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authorMatthias P. Braendli <matthias.braendli@mpb.li>2019-10-07 04:52:50 +0200
committerMatthias P. Braendli <matthias.braendli@mpb.li>2019-10-07 04:52:50 +0200
commit0aa6201a490bfabc0ae021ceb9f1fb0f46727c5d (patch)
treea71d934d8151dd43e7c16555fef17fd749c5da70 /lib/asio/windows/overlapped_handle.hpp
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-//
-// windows/overlapped_handle.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_WINDOWS_OVERLAPPED_HANDLE_HPP
-#define ASIO_WINDOWS_OVERLAPPED_HANDLE_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_ENABLE_OLD_SERVICES)
-
-#if defined(ASIO_HAS_WINDOWS_RANDOM_ACCESS_HANDLE) \
- || defined(ASIO_HAS_WINDOWS_STREAM_HANDLE) \
- || defined(GENERATING_DOCUMENTATION)
-
-#include <cstddef>
-#include "asio/async_result.hpp"
-#include "asio/basic_io_object.hpp"
-#include "asio/detail/throw_error.hpp"
-#include "asio/detail/win_iocp_handle_service.hpp"
-#include "asio/error.hpp"
-#include "asio/io_context.hpp"
-
-#if defined(ASIO_HAS_MOVE)
-# include <utility>
-#endif // defined(ASIO_HAS_MOVE)
-
-#define ASIO_SVC_T asio::detail::win_iocp_handle_service
-
-#include "asio/detail/push_options.hpp"
-
-namespace asio {
-namespace windows {
-
-/// Provides Windows handle functionality for objects that support
-/// overlapped I/O.
-/**
- * The windows::overlapped_handle class provides the ability to wrap a Windows
- * handle. The underlying object referred to by the handle must support
- * overlapped I/O.
- *
- * @par Thread Safety
- * @e Distinct @e objects: Safe.@n
- * @e Shared @e objects: Unsafe.
- */
-class overlapped_handle
- : ASIO_SVC_ACCESS basic_io_object<ASIO_SVC_T>
-{
-public:
- /// The type of the executor associated with the object.
- typedef io_context::executor_type executor_type;
-
- /// The native representation of a handle.
-#if defined(GENERATING_DOCUMENTATION)
- typedef implementation_defined native_handle_type;
-#else
- typedef ASIO_SVC_T::native_handle_type native_handle_type;
-#endif
-
- /// An overlapped_handle is always the lowest layer.
- typedef overlapped_handle lowest_layer_type;
-
- /// Construct an overlapped_handle without opening it.
- /**
- * This constructor creates a handle without opening it.
- *
- * @param io_context The io_context object that the handle will use to
- * dispatch handlers for any asynchronous operations performed on the handle.
- */
- explicit overlapped_handle(asio::io_context& io_context)
- : basic_io_object<ASIO_SVC_T>(io_context)
- {
- }
-
- /// Construct an overlapped_handle on an existing native handle.
- /**
- * This constructor creates a handle object to hold an existing native handle.
- *
- * @param io_context The io_context object that the handle will use to
- * dispatch handlers for any asynchronous operations performed on the handle.
- *
- * @param handle A native handle.
- *
- * @throws asio::system_error Thrown on failure.
- */
- overlapped_handle(asio::io_context& io_context,
- const native_handle_type& handle)
- : basic_io_object<ASIO_SVC_T>(io_context)
- {
- asio::error_code ec;
- this->get_service().assign(this->get_implementation(), handle, ec);
- asio::detail::throw_error(ec, "assign");
- }
-
-#if defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
- /// Move-construct an overlapped_handle from another.
- /**
- * This constructor moves a handle from one object to another.
- *
- * @param other The other overlapped_handle object from which the move will
- * occur.
- *
- * @note Following the move, the moved-from object is in the same state as if
- * constructed using the @c overlapped_handle(io_context&) constructor.
- */
- overlapped_handle(overlapped_handle&& other)
- : basic_io_object<ASIO_SVC_T>(std::move(other))
- {
- }
-
- /// Move-assign an overlapped_handle from another.
- /**
- * This assignment operator moves a handle from one object to another.
- *
- * @param other The other overlapped_handle object from which the move will
- * occur.
- *
- * @note Following the move, the moved-from object is in the same state as if
- * constructed using the @c overlapped_handle(io_context&) constructor.
- */
- overlapped_handle& operator=(overlapped_handle&& other)
- {
- basic_io_object<ASIO_SVC_T>::operator=(std::move(other));
- return *this;
- }
-#endif // defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
-
-#if !defined(ASIO_NO_DEPRECATED)
- /// (Deprecated: Use get_executor().) Get the io_context associated with the
- /// object.
- /**
- * This function may be used to obtain the io_context object that the I/O
- * object uses to dispatch handlers for asynchronous operations.
- *
- * @return A reference to the io_context object that the I/O object will use
- * to dispatch handlers. Ownership is not transferred to the caller.
- */
- asio::io_context& get_io_context()
- {
- return basic_io_object<ASIO_SVC_T>::get_io_context();
- }
-
- /// (Deprecated: Use get_executor().) Get the io_context associated with the
- /// object.
- /**
- * This function may be used to obtain the io_context object that the I/O
- * object uses to dispatch handlers for asynchronous operations.
- *
- * @return A reference to the io_context object that the I/O object will use
- * to dispatch handlers. Ownership is not transferred to the caller.
- */
- asio::io_context& get_io_service()
- {
- return basic_io_object<ASIO_SVC_T>::get_io_service();
- }
-#endif // !defined(ASIO_NO_DEPRECATED)
-
- /// Get the executor associated with the object.
- executor_type get_executor() ASIO_NOEXCEPT
- {
- return basic_io_object<ASIO_SVC_T>::get_executor();
- }
-
- /// Get a reference to the lowest layer.
- /**
- * This function returns a reference to the lowest layer in a stack of
- * layers. Since an overlapped_handle cannot contain any further layers, it
- * simply returns a reference to itself.
- *
- * @return A reference to the lowest layer in the stack of layers. Ownership
- * is not transferred to the caller.
- */
- lowest_layer_type& lowest_layer()
- {
- return *this;
- }
-
- /// Get a const reference to the lowest layer.
- /**
- * This function returns a const reference to the lowest layer in a stack of
- * layers. Since an overlapped_handle cannot contain any further layers, it
- * simply returns a reference to itself.
- *
- * @return A const reference to the lowest layer in the stack of layers.
- * Ownership is not transferred to the caller.
- */
- const lowest_layer_type& lowest_layer() const
- {
- return *this;
- }
-
- /// Assign an existing native handle to the handle.
- /*
- * This function opens the handle to hold an existing native handle.
- *
- * @param handle A native handle.
- *
- * @throws asio::system_error Thrown on failure.
- */
- void assign(const native_handle_type& handle)
- {
- asio::error_code ec;
- this->get_service().assign(this->get_implementation(), handle, ec);
- asio::detail::throw_error(ec, "assign");
- }
-
- /// Assign an existing native handle to the handle.
- /*
- * This function opens the handle to hold an existing native handle.
- *
- * @param handle A native handle.
- *
- * @param ec Set to indicate what error occurred, if any.
- */
- ASIO_SYNC_OP_VOID assign(const native_handle_type& handle,
- asio::error_code& ec)
- {
- this->get_service().assign(this->get_implementation(), handle, ec);
- ASIO_SYNC_OP_VOID_RETURN(ec);
- }
-
- /// Determine whether the handle is open.
- bool is_open() const
- {
- return this->get_service().is_open(this->get_implementation());
- }
-
- /// Close the handle.
- /**
- * This function is used to close the handle. Any asynchronous read or write
- * operations will be cancelled immediately, and will complete with the
- * asio::error::operation_aborted error.
- *
- * @throws asio::system_error Thrown on failure.
- */
- void close()
- {
- asio::error_code ec;
- this->get_service().close(this->get_implementation(), ec);
- asio::detail::throw_error(ec, "close");
- }
-
- /// Close the handle.
- /**
- * This function is used to close the handle. Any asynchronous read or write
- * operations will be cancelled immediately, and will complete with the
- * asio::error::operation_aborted error.
- *
- * @param ec Set to indicate what error occurred, if any.
- */
- ASIO_SYNC_OP_VOID close(asio::error_code& ec)
- {
- this->get_service().close(this->get_implementation(), ec);
- ASIO_SYNC_OP_VOID_RETURN(ec);
- }
-
- /// Get the native handle representation.
- /**
- * This function may be used to obtain the underlying representation of the
- * handle. This is intended to allow access to native handle functionality
- * that is not otherwise provided.
- */
- native_handle_type native_handle()
- {
- return this->get_service().native_handle(this->get_implementation());
- }
-
- /// Cancel all asynchronous operations associated with the handle.
- /**
- * This function causes all outstanding asynchronous read or write operations
- * to finish immediately, and the handlers for cancelled operations will be
- * passed the asio::error::operation_aborted error.
- *
- * @throws asio::system_error Thrown on failure.
- */
- void cancel()
- {
- asio::error_code ec;
- this->get_service().cancel(this->get_implementation(), ec);
- asio::detail::throw_error(ec, "cancel");
- }
-
- /// Cancel all asynchronous operations associated with the handle.
- /**
- * This function causes all outstanding asynchronous read or write operations
- * to finish immediately, and the handlers for cancelled operations will be
- * passed the asio::error::operation_aborted error.
- *
- * @param ec Set to indicate what error occurred, if any.
- */
- ASIO_SYNC_OP_VOID cancel(asio::error_code& ec)
- {
- this->get_service().cancel(this->get_implementation(), ec);
- ASIO_SYNC_OP_VOID_RETURN(ec);
- }
-
-protected:
- /// Protected destructor to prevent deletion through this type.
- /**
- * This function destroys the handle, cancelling any outstanding asynchronous
- * wait operations associated with the handle as if by calling @c cancel.
- */
- ~overlapped_handle()
- {
- }
-};
-
-} // namespace windows
-} // namespace asio
-
-#include "asio/detail/pop_options.hpp"
-
-#undef ASIO_SVC_T
-
-#endif // defined(ASIO_HAS_WINDOWS_RANDOM_ACCESS_HANDLE)
- // || defined(ASIO_HAS_WINDOWS_STREAM_HANDLE)
- // || defined(GENERATING_DOCUMENTATION)
-
-#endif // !defined(ASIO_ENABLE_OLD_SERVICES)
-
-#endif // ASIO_WINDOWS_OVERLAPPED_HANDLE_HPP