362 lines
11 KiB
C++
362 lines
11 KiB
C++
//
|
|
// windows/basic_overlapped_handle.hpp
|
|
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
//
|
|
// Copyright (c) 2003-2021 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_BASIC_OVERLAPPED_HANDLE_HPP
|
|
#define ASIO_WINDOWS_BASIC_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_HAS_WINDOWS_RANDOM_ACCESS_HANDLE) \
|
|
|| defined(ASIO_HAS_WINDOWS_STREAM_HANDLE) \
|
|
|| defined(GENERATING_DOCUMENTATION)
|
|
|
|
#include <cstddef>
|
|
#include "asio/any_io_executor.hpp"
|
|
#include "asio/async_result.hpp"
|
|
#include "asio/detail/io_object_impl.hpp"
|
|
#include "asio/detail/throw_error.hpp"
|
|
#include "asio/detail/win_iocp_handle_service.hpp"
|
|
#include "asio/error.hpp"
|
|
#include "asio/execution_context.hpp"
|
|
|
|
#if defined(ASIO_HAS_MOVE)
|
|
# include <utility>
|
|
#endif // defined(ASIO_HAS_MOVE)
|
|
|
|
#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.
|
|
*/
|
|
template <typename Executor = any_io_executor>
|
|
class basic_overlapped_handle
|
|
{
|
|
public:
|
|
/// The type of the executor associated with the object.
|
|
typedef Executor executor_type;
|
|
|
|
/// Rebinds the handle type to another executor.
|
|
template <typename Executor1>
|
|
struct rebind_executor
|
|
{
|
|
/// The handle type when rebound to the specified executor.
|
|
typedef basic_overlapped_handle<Executor1> other;
|
|
};
|
|
|
|
/// The native representation of a handle.
|
|
#if defined(GENERATING_DOCUMENTATION)
|
|
typedef implementation_defined native_handle_type;
|
|
#else
|
|
typedef asio::detail::win_iocp_handle_service::native_handle_type
|
|
native_handle_type;
|
|
#endif
|
|
|
|
/// An overlapped_handle is always the lowest layer.
|
|
typedef basic_overlapped_handle lowest_layer_type;
|
|
|
|
/// Construct an overlapped handle without opening it.
|
|
/**
|
|
* This constructor creates an overlapped handle without opening it.
|
|
*
|
|
* @param ex The I/O executor that the overlapped handle will use, by default,
|
|
* to dispatch handlers for any asynchronous operations performed on the
|
|
* overlapped handle.
|
|
*/
|
|
explicit basic_overlapped_handle(const executor_type& ex)
|
|
: impl_(0, ex)
|
|
{
|
|
}
|
|
|
|
/// Construct an overlapped handle without opening it.
|
|
/**
|
|
* This constructor creates an overlapped handle without opening it.
|
|
*
|
|
* @param context An execution context which provides the I/O executor that
|
|
* the overlapped handle will use, by default, to dispatch handlers for any
|
|
* asynchronous operations performed on the overlapped handle.
|
|
*/
|
|
template <typename ExecutionContext>
|
|
explicit basic_overlapped_handle(ExecutionContext& context,
|
|
typename constraint<
|
|
is_convertible<ExecutionContext&, execution_context&>::value,
|
|
defaulted_constraint
|
|
>::type = defaulted_constraint())
|
|
: impl_(0, 0, context)
|
|
{
|
|
}
|
|
|
|
/// Construct an overlapped handle on an existing native handle.
|
|
/**
|
|
* This constructor creates an overlapped handle object to hold an existing
|
|
* native handle.
|
|
*
|
|
* @param ex The I/O executor that the overlapped handle will use, by default,
|
|
* to dispatch handlers for any asynchronous operations performed on the
|
|
* overlapped handle.
|
|
*
|
|
* @param native_handle The new underlying handle implementation.
|
|
*
|
|
* @throws asio::system_error Thrown on failure.
|
|
*/
|
|
basic_overlapped_handle(const executor_type& ex,
|
|
const native_handle_type& native_handle)
|
|
: impl_(0, ex)
|
|
{
|
|
asio::error_code ec;
|
|
impl_.get_service().assign(impl_.get_implementation(), native_handle, ec);
|
|
asio::detail::throw_error(ec, "assign");
|
|
}
|
|
|
|
/// Construct an overlapped handle on an existing native handle.
|
|
/**
|
|
* This constructor creates an overlapped handle object to hold an existing
|
|
* native handle.
|
|
*
|
|
* @param context An execution context which provides the I/O executor that
|
|
* the overlapped handle will use, by default, to dispatch handlers for any
|
|
* asynchronous operations performed on the overlapped handle.
|
|
*
|
|
* @param native_handle The new underlying handle implementation.
|
|
*
|
|
* @throws asio::system_error Thrown on failure.
|
|
*/
|
|
template <typename ExecutionContext>
|
|
basic_overlapped_handle(ExecutionContext& context,
|
|
const native_handle_type& native_handle,
|
|
typename constraint<
|
|
is_convertible<ExecutionContext&, execution_context&>::value
|
|
>::type = 0)
|
|
: impl_(0, 0, context)
|
|
{
|
|
asio::error_code ec;
|
|
impl_.get_service().assign(impl_.get_implementation(), native_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(const executor_type&)
|
|
* constructor.
|
|
*/
|
|
basic_overlapped_handle(basic_overlapped_handle&& other)
|
|
: impl_(std::move(other.impl_))
|
|
{
|
|
}
|
|
|
|
/// 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(const executor_type&)
|
|
* constructor.
|
|
*/
|
|
basic_overlapped_handle& operator=(basic_overlapped_handle&& other)
|
|
{
|
|
impl_ = std::move(other.impl_);
|
|
return *this;
|
|
}
|
|
#endif // defined(ASIO_HAS_MOVE) || defined(GENERATING_DOCUMENTATION)
|
|
|
|
/// Get the executor associated with the object.
|
|
executor_type get_executor() ASIO_NOEXCEPT
|
|
{
|
|
return impl_.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;
|
|
impl_.get_service().assign(impl_.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)
|
|
{
|
|
impl_.get_service().assign(impl_.get_implementation(), handle, ec);
|
|
ASIO_SYNC_OP_VOID_RETURN(ec);
|
|
}
|
|
|
|
/// Determine whether the handle is open.
|
|
bool is_open() const
|
|
{
|
|
return impl_.get_service().is_open(impl_.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;
|
|
impl_.get_service().close(impl_.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)
|
|
{
|
|
impl_.get_service().close(impl_.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 impl_.get_service().native_handle(impl_.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;
|
|
impl_.get_service().cancel(impl_.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)
|
|
{
|
|
impl_.get_service().cancel(impl_.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.
|
|
*/
|
|
~basic_overlapped_handle()
|
|
{
|
|
}
|
|
|
|
asio::detail::io_object_impl<
|
|
asio::detail::win_iocp_handle_service, Executor> impl_;
|
|
|
|
private:
|
|
// Disallow copying and assignment.
|
|
basic_overlapped_handle(const basic_overlapped_handle&) ASIO_DELETED;
|
|
basic_overlapped_handle& operator=(
|
|
const basic_overlapped_handle&) ASIO_DELETED;
|
|
};
|
|
|
|
} // namespace windows
|
|
} // namespace asio
|
|
|
|
#include "asio/detail/pop_options.hpp"
|
|
|
|
#endif // defined(ASIO_HAS_WINDOWS_RANDOM_ACCESS_HANDLE)
|
|
// || defined(ASIO_HAS_WINDOWS_STREAM_HANDLE)
|
|
// || defined(GENERATING_DOCUMENTATION)
|
|
|
|
#endif // ASIO_WINDOWS_BASIC_OVERLAPPED_HANDLE_HPP
|