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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/random_access_handle.hpp
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-//
-// windows/random_access_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_RANDOM_ACCESS_HANDLE_HPP
-#define ASIO_WINDOWS_RANDOM_ACCESS_HANDLE_HPP
-
-#if defined(_MSC_VER) && (_MSC_VER >= 1200)
-# pragma once
-#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
-
-#include "asio/detail/config.hpp"
-#include "asio/windows/overlapped_handle.hpp"
-
-#if defined(ASIO_HAS_WINDOWS_RANDOM_ACCESS_HANDLE) \
- || defined(GENERATING_DOCUMENTATION)
-
-#if defined(ASIO_ENABLE_OLD_SERVICES)
-# include "asio/windows/basic_random_access_handle.hpp"
-#endif // defined(ASIO_ENABLE_OLD_SERVICES)
-
-#include "asio/detail/push_options.hpp"
-
-namespace asio {
-namespace windows {
-
-#if defined(ASIO_ENABLE_OLD_SERVICES)
-// Typedef for the typical usage of a random-access handle.
-typedef basic_random_access_handle<> random_access_handle;
-#else // defined(ASIO_ENABLE_OLD_SERVICES)
-/// Provides random-access handle functionality.
-/**
- * The windows::random_access_handle class provides asynchronous and
- * blocking random-access handle functionality.
- *
- * @par Thread Safety
- * @e Distinct @e objects: Safe.@n
- * @e Shared @e objects: Unsafe.
- */
-class random_access_handle
- : public overlapped_handle
-{
-public:
- /// Construct a random_access_handle without opening it.
- /**
- * This constructor creates a random-access handle without opening it. The
- * handle needs to be opened before data can be written to or read from it.
- *
- * @param io_context The io_context object that the random-access handle will
- * use to dispatch handlers for any asynchronous operations performed on the
- * handle.
- */
- explicit random_access_handle(asio::io_context& io_context)
- : overlapped_handle(io_context)
- {
- }
-
- /// Construct a random_access_handle on an existing native handle.
- /**
- * This constructor creates a random-access handle object to hold an existing
- * native handle.
- *
- * @param io_context The io_context object that the random-access handle will
- * use to dispatch handlers for any asynchronous operations performed on the
- * handle.
- *
- * @param handle The new underlying handle implementation.
- *
- * @throws asio::system_error Thrown on failure.
- */
- random_access_handle(asio::io_context& io_context,
- const native_handle_type& handle)
- : overlapped_handle(io_context, handle)
- {
- }
-
-#if defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
- /// Move-construct a random_access_handle from another.
- /**
- * This constructor moves a random-access handle from one object to another.
- *
- * @param other The other random_access_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 random_access_handle(io_context&)
- * constructor.
- */
- random_access_handle(random_access_handle&& other)
- : overlapped_handle(std::move(other))
- {
- }
-
- /// Move-assign a random_access_handle from another.
- /**
- * This assignment operator moves a random-access handle from one object to
- * another.
- *
- * @param other The other random_access_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 random_access_handle(io_context&)
- * constructor.
- */
- random_access_handle& operator=(random_access_handle&& other)
- {
- overlapped_handle::operator=(std::move(other));
- return *this;
- }
-#endif // defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
-
- /// Write some data to the handle at the specified offset.
- /**
- * This function is used to write data to the random-access handle. The
- * function call will block until one or more bytes of the data has been
- * written successfully, or until an error occurs.
- *
- * @param offset The offset at which the data will be written.
- *
- * @param buffers One or more data buffers to be written to the handle.
- *
- * @returns The number of bytes written.
- *
- * @throws asio::system_error Thrown on failure. An error code of
- * asio::error::eof indicates that the connection was closed by the
- * peer.
- *
- * @note The write_some_at operation may not write all of the data. Consider
- * using the @ref write_at function if you need to ensure that all data is
- * written before the blocking operation completes.
- *
- * @par Example
- * To write a single data buffer use the @ref buffer function as follows:
- * @code
- * handle.write_some_at(42, asio::buffer(data, size));
- * @endcode
- * See the @ref buffer documentation for information on writing multiple
- * buffers in one go, and how to use it with arrays, boost::array or
- * std::vector.
- */
- template <typename ConstBufferSequence>
- std::size_t write_some_at(uint64_t offset,
- const ConstBufferSequence& buffers)
- {
- asio::error_code ec;
- std::size_t s = this->get_service().write_some_at(
- this->get_implementation(), offset, buffers, ec);
- asio::detail::throw_error(ec, "write_some_at");
- return s;
- }
-
- /// Write some data to the handle at the specified offset.
- /**
- * This function is used to write data to the random-access handle. The
- * function call will block until one or more bytes of the data has been
- * written successfully, or until an error occurs.
- *
- * @param offset The offset at which the data will be written.
- *
- * @param buffers One or more data buffers to be written to the handle.
- *
- * @param ec Set to indicate what error occurred, if any.
- *
- * @returns The number of bytes written. Returns 0 if an error occurred.
- *
- * @note The write_some operation may not transmit all of the data to the
- * peer. Consider using the @ref write_at function if you need to ensure that
- * all data is written before the blocking operation completes.
- */
- template <typename ConstBufferSequence>
- std::size_t write_some_at(uint64_t offset,
- const ConstBufferSequence& buffers, asio::error_code& ec)
- {
- return this->get_service().write_some_at(
- this->get_implementation(), offset, buffers, ec);
- }
-
- /// Start an asynchronous write at the specified offset.
- /**
- * This function is used to asynchronously write data to the random-access
- * handle. The function call always returns immediately.
- *
- * @param offset The offset at which the data will be written.
- *
- * @param buffers One or more data buffers to be written to the handle.
- * Although the buffers object may be copied as necessary, ownership of the
- * underlying memory blocks is retained by the caller, which must guarantee
- * that they remain valid until the handler is called.
- *
- * @param handler The handler to be called when the write operation completes.
- * Copies will be made of the handler as required. The function signature of
- * the handler must be:
- * @code void handler(
- * const asio::error_code& error, // Result of operation.
- * std::size_t bytes_transferred // Number of bytes written.
- * ); @endcode
- * Regardless of whether the asynchronous operation completes immediately or
- * not, the handler will not be invoked from within this function. Invocation
- * of the handler will be performed in a manner equivalent to using
- * asio::io_context::post().
- *
- * @note The write operation may not transmit all of the data to the peer.
- * Consider using the @ref async_write_at function if you need to ensure that
- * all data is written before the asynchronous operation completes.
- *
- * @par Example
- * To write a single data buffer use the @ref buffer function as follows:
- * @code
- * handle.async_write_some_at(42, asio::buffer(data, size), handler);
- * @endcode
- * See the @ref buffer documentation for information on writing multiple
- * buffers in one go, and how to use it with arrays, boost::array or
- * std::vector.
- */
- template <typename ConstBufferSequence, typename WriteHandler>
- ASIO_INITFN_RESULT_TYPE(WriteHandler,
- void (asio::error_code, std::size_t))
- async_write_some_at(uint64_t offset,
- const ConstBufferSequence& buffers,
- ASIO_MOVE_ARG(WriteHandler) handler)
- {
- // If you get an error on the following line it means that your handler does
- // not meet the documented type requirements for a WriteHandler.
- ASIO_WRITE_HANDLER_CHECK(WriteHandler, handler) type_check;
-
- asio::async_completion<WriteHandler,
- void (asio::error_code, std::size_t)> init(handler);
-
- this->get_service().async_write_some_at(this->get_implementation(),
- offset, buffers, init.completion_handler);
-
- return init.result.get();
- }
-
- /// Read some data from the handle at the specified offset.
- /**
- * This function is used to read data from the random-access handle. The
- * function call will block until one or more bytes of data has been read
- * successfully, or until an error occurs.
- *
- * @param offset The offset at which the data will be read.
- *
- * @param buffers One or more buffers into which the data will be read.
- *
- * @returns The number of bytes read.
- *
- * @throws asio::system_error Thrown on failure. An error code of
- * asio::error::eof indicates that the connection was closed by the
- * peer.
- *
- * @note The read_some operation may not read all of the requested number of
- * bytes. Consider using the @ref read_at function if you need to ensure that
- * the requested amount of data is read before the blocking operation
- * completes.
- *
- * @par Example
- * To read into a single data buffer use the @ref buffer function as follows:
- * @code
- * handle.read_some_at(42, asio::buffer(data, size));
- * @endcode
- * See the @ref buffer documentation for information on reading into multiple
- * buffers in one go, and how to use it with arrays, boost::array or
- * std::vector.
- */
- template <typename MutableBufferSequence>
- std::size_t read_some_at(uint64_t offset,
- const MutableBufferSequence& buffers)
- {
- asio::error_code ec;
- std::size_t s = this->get_service().read_some_at(
- this->get_implementation(), offset, buffers, ec);
- asio::detail::throw_error(ec, "read_some_at");
- return s;
- }
-
- /// Read some data from the handle at the specified offset.
- /**
- * This function is used to read data from the random-access handle. The
- * function call will block until one or more bytes of data has been read
- * successfully, or until an error occurs.
- *
- * @param offset The offset at which the data will be read.
- *
- * @param buffers One or more buffers into which the data will be read.
- *
- * @param ec Set to indicate what error occurred, if any.
- *
- * @returns The number of bytes read. Returns 0 if an error occurred.
- *
- * @note The read_some operation may not read all of the requested number of
- * bytes. Consider using the @ref read_at function if you need to ensure that
- * the requested amount of data is read before the blocking operation
- * completes.
- */
- template <typename MutableBufferSequence>
- std::size_t read_some_at(uint64_t offset,
- const MutableBufferSequence& buffers, asio::error_code& ec)
- {
- return this->get_service().read_some_at(
- this->get_implementation(), offset, buffers, ec);
- }
-
- /// Start an asynchronous read at the specified offset.
- /**
- * This function is used to asynchronously read data from the random-access
- * handle. The function call always returns immediately.
- *
- * @param offset The offset at which the data will be read.
- *
- * @param buffers One or more buffers into which the data will be read.
- * Although the buffers object may be copied as necessary, ownership of the
- * underlying memory blocks is retained by the caller, which must guarantee
- * that they remain valid until the handler is called.
- *
- * @param handler The handler to be called when the read operation completes.
- * Copies will be made of the handler as required. The function signature of
- * the handler must be:
- * @code void handler(
- * const asio::error_code& error, // Result of operation.
- * std::size_t bytes_transferred // Number of bytes read.
- * ); @endcode
- * Regardless of whether the asynchronous operation completes immediately or
- * not, the handler will not be invoked from within this function. Invocation
- * of the handler will be performed in a manner equivalent to using
- * asio::io_context::post().
- *
- * @note The read operation may not read all of the requested number of bytes.
- * Consider using the @ref async_read_at function if you need to ensure that
- * the requested amount of data is read before the asynchronous operation
- * completes.
- *
- * @par Example
- * To read into a single data buffer use the @ref buffer function as follows:
- * @code
- * handle.async_read_some_at(42, asio::buffer(data, size), handler);
- * @endcode
- * See the @ref buffer documentation for information on reading into multiple
- * buffers in one go, and how to use it with arrays, boost::array or
- * std::vector.
- */
- template <typename MutableBufferSequence, typename ReadHandler>
- ASIO_INITFN_RESULT_TYPE(ReadHandler,
- void (asio::error_code, std::size_t))
- async_read_some_at(uint64_t offset,
- const MutableBufferSequence& buffers,
- ASIO_MOVE_ARG(ReadHandler) handler)
- {
- // If you get an error on the following line it means that your handler does
- // not meet the documented type requirements for a ReadHandler.
- ASIO_READ_HANDLER_CHECK(ReadHandler, handler) type_check;
-
- asio::async_completion<ReadHandler,
- void (asio::error_code, std::size_t)> init(handler);
-
- this->get_service().async_read_some_at(this->get_implementation(),
- offset, buffers, init.completion_handler);
-
- return init.result.get();
- }
-};
-#endif // defined(ASIO_ENABLE_OLD_SERVICES)
-
-} // namespace windows
-} // namespace asio
-
-#include "asio/detail/pop_options.hpp"
-
-#endif // defined(ASIO_HAS_WINDOWS_RANDOM_ACCESS_HANDLE)
- // || defined(GENERATING_DOCUMENTATION)
-
-#endif // ASIO_WINDOWS_RANDOM_ACCESS_HANDLE_HPP