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+//
+// detail/reactive_descriptor_service.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_DETAIL_REACTIVE_DESCRIPTOR_SERVICE_HPP
+#define ASIO_DETAIL_REACTIVE_DESCRIPTOR_SERVICE_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_WINDOWS) \
+ && !defined(ASIO_WINDOWS_RUNTIME) \
+ && !defined(__CYGWIN__)
+
+#include "asio/associated_cancellation_slot.hpp"
+#include "asio/buffer.hpp"
+#include "asio/cancellation_type.hpp"
+#include "asio/execution_context.hpp"
+#include "asio/detail/bind_handler.hpp"
+#include "asio/detail/buffer_sequence_adapter.hpp"
+#include "asio/detail/descriptor_ops.hpp"
+#include "asio/detail/descriptor_read_op.hpp"
+#include "asio/detail/descriptor_write_op.hpp"
+#include "asio/detail/fenced_block.hpp"
+#include "asio/detail/memory.hpp"
+#include "asio/detail/noncopyable.hpp"
+#include "asio/detail/reactive_null_buffers_op.hpp"
+#include "asio/detail/reactive_wait_op.hpp"
+#include "asio/detail/reactor.hpp"
+#include "asio/posix/descriptor_base.hpp"
+
+#include "asio/detail/push_options.hpp"
+
+namespace asio {
+namespace detail {
+
+class reactive_descriptor_service :
+ public execution_context_service_base<reactive_descriptor_service>
+{
+public:
+ // The native type of a descriptor.
+ typedef int native_handle_type;
+
+ // The implementation type of the descriptor.
+ class implementation_type
+ : private asio::detail::noncopyable
+ {
+ public:
+ // Default constructor.
+ implementation_type()
+ : descriptor_(-1),
+ state_(0)
+ {
+ }
+
+ private:
+ // Only this service will have access to the internal values.
+ friend class reactive_descriptor_service;
+
+ // The native descriptor representation.
+ int descriptor_;
+
+ // The current state of the descriptor.
+ descriptor_ops::state_type state_;
+
+ // Per-descriptor data used by the reactor.
+ reactor::per_descriptor_data reactor_data_;
+ };
+
+ // Constructor.
+ ASIO_DECL reactive_descriptor_service(execution_context& context);
+
+ // Destroy all user-defined handler objects owned by the service.
+ ASIO_DECL void shutdown();
+
+ // Construct a new descriptor implementation.
+ ASIO_DECL void construct(implementation_type& impl);
+
+ // Move-construct a new descriptor implementation.
+ ASIO_DECL void move_construct(implementation_type& impl,
+ implementation_type& other_impl) ASIO_NOEXCEPT;
+
+ // Move-assign from another descriptor implementation.
+ ASIO_DECL void move_assign(implementation_type& impl,
+ reactive_descriptor_service& other_service,
+ implementation_type& other_impl);
+
+ // Destroy a descriptor implementation.
+ ASIO_DECL void destroy(implementation_type& impl);
+
+ // Assign a native descriptor to a descriptor implementation.
+ ASIO_DECL asio::error_code assign(implementation_type& impl,
+ const native_handle_type& native_descriptor,
+ asio::error_code& ec);
+
+ // Determine whether the descriptor is open.
+ bool is_open(const implementation_type& impl) const
+ {
+ return impl.descriptor_ != -1;
+ }
+
+ // Destroy a descriptor implementation.
+ ASIO_DECL asio::error_code close(implementation_type& impl,
+ asio::error_code& ec);
+
+ // Get the native descriptor representation.
+ native_handle_type native_handle(const implementation_type& impl) const
+ {
+ return impl.descriptor_;
+ }
+
+ // Release ownership of the native descriptor representation.
+ ASIO_DECL native_handle_type release(implementation_type& impl);
+
+ // Cancel all operations associated with the descriptor.
+ ASIO_DECL asio::error_code cancel(implementation_type& impl,
+ asio::error_code& ec);
+
+ // Perform an IO control command on the descriptor.
+ template <typename IO_Control_Command>
+ asio::error_code io_control(implementation_type& impl,
+ IO_Control_Command& command, asio::error_code& ec)
+ {
+ descriptor_ops::ioctl(impl.descriptor_, impl.state_,
+ command.name(), static_cast<ioctl_arg_type*>(command.data()), ec);
+ return ec;
+ }
+
+ // Gets the non-blocking mode of the descriptor.
+ bool non_blocking(const implementation_type& impl) const
+ {
+ return (impl.state_ & descriptor_ops::user_set_non_blocking) != 0;
+ }
+
+ // Sets the non-blocking mode of the descriptor.
+ asio::error_code non_blocking(implementation_type& impl,
+ bool mode, asio::error_code& ec)
+ {
+ descriptor_ops::set_user_non_blocking(
+ impl.descriptor_, impl.state_, mode, ec);
+ return ec;
+ }
+
+ // Gets the non-blocking mode of the native descriptor implementation.
+ bool native_non_blocking(const implementation_type& impl) const
+ {
+ return (impl.state_ & descriptor_ops::internal_non_blocking) != 0;
+ }
+
+ // Sets the non-blocking mode of the native descriptor implementation.
+ asio::error_code native_non_blocking(implementation_type& impl,
+ bool mode, asio::error_code& ec)
+ {
+ descriptor_ops::set_internal_non_blocking(
+ impl.descriptor_, impl.state_, mode, ec);
+ return ec;
+ }
+
+ // Wait for the descriptor to become ready to read, ready to write, or to have
+ // pending error conditions.
+ asio::error_code wait(implementation_type& impl,
+ posix::descriptor_base::wait_type w, asio::error_code& ec)
+ {
+ switch (w)
+ {
+ case posix::descriptor_base::wait_read:
+ descriptor_ops::poll_read(impl.descriptor_, impl.state_, ec);
+ break;
+ case posix::descriptor_base::wait_write:
+ descriptor_ops::poll_write(impl.descriptor_, impl.state_, ec);
+ break;
+ case posix::descriptor_base::wait_error:
+ descriptor_ops::poll_error(impl.descriptor_, impl.state_, ec);
+ break;
+ default:
+ ec = asio::error::invalid_argument;
+ break;
+ }
+
+ return ec;
+ }
+
+ // Asynchronously wait for the descriptor to become ready to read, ready to
+ // write, or to have pending error conditions.
+ template <typename Handler, typename IoExecutor>
+ void async_wait(implementation_type& impl,
+ posix::descriptor_base::wait_type w,
+ Handler& handler, const IoExecutor& io_ex)
+ {
+ bool is_continuation =
+ asio_handler_cont_helpers::is_continuation(handler);
+
+ typename associated_cancellation_slot<Handler>::type slot
+ = asio::get_associated_cancellation_slot(handler);
+
+ // Allocate and construct an operation to wrap the handler.
+ typedef reactive_wait_op<Handler, IoExecutor> op;
+ typename op::ptr p = { asio::detail::addressof(handler),
+ op::ptr::allocate(handler), 0 };
+ p.p = new (p.v) op(success_ec_, handler, io_ex);
+
+ ASIO_HANDLER_CREATION((reactor_.context(), *p.p, "descriptor",
+ &impl, impl.descriptor_, "async_wait"));
+
+ int op_type;
+ switch (w)
+ {
+ case posix::descriptor_base::wait_read:
+ op_type = reactor::read_op;
+ break;
+ case posix::descriptor_base::wait_write:
+ op_type = reactor::write_op;
+ break;
+ case posix::descriptor_base::wait_error:
+ op_type = reactor::except_op;
+ break;
+ default:
+ p.p->ec_ = asio::error::invalid_argument;
+ reactor_.post_immediate_completion(p.p, is_continuation);
+ p.v = p.p = 0;
+ return;
+ }
+
+ // Optionally register for per-operation cancellation.
+ if (slot.is_connected())
+ {
+ p.p->cancellation_key_ =
+ &slot.template emplace<reactor_op_cancellation>(
+ &reactor_, &impl.reactor_data_, impl.descriptor_, op_type);
+ }
+
+ start_op(impl, op_type, p.p, is_continuation, false, false);
+ p.v = p.p = 0;
+ }
+
+ // Write some data to the descriptor.
+ template <typename ConstBufferSequence>
+ size_t write_some(implementation_type& impl,
+ const ConstBufferSequence& buffers, asio::error_code& ec)
+ {
+ typedef buffer_sequence_adapter<asio::const_buffer,
+ ConstBufferSequence> bufs_type;
+
+ if (bufs_type::is_single_buffer)
+ {
+ return descriptor_ops::sync_write1(impl.descriptor_,
+ impl.state_, bufs_type::first(buffers).data(),
+ bufs_type::first(buffers).size(), ec);
+ }
+ else
+ {
+ bufs_type bufs(buffers);
+
+ return descriptor_ops::sync_write(impl.descriptor_, impl.state_,
+ bufs.buffers(), bufs.count(), bufs.all_empty(), ec);
+ }
+ }
+
+ // Wait until data can be written without blocking.
+ size_t write_some(implementation_type& impl,
+ const null_buffers&, asio::error_code& ec)
+ {
+ // Wait for descriptor to become ready.
+ descriptor_ops::poll_write(impl.descriptor_, impl.state_, ec);
+
+ return 0;
+ }
+
+ // Start an asynchronous write. The data being sent must be valid for the
+ // lifetime of the asynchronous operation.
+ template <typename ConstBufferSequence, typename Handler, typename IoExecutor>
+ void async_write_some(implementation_type& impl,
+ const ConstBufferSequence& buffers, Handler& handler,
+ const IoExecutor& io_ex)
+ {
+ bool is_continuation =
+ asio_handler_cont_helpers::is_continuation(handler);
+
+ typename associated_cancellation_slot<Handler>::type slot
+ = asio::get_associated_cancellation_slot(handler);
+
+ // Allocate and construct an operation to wrap the handler.
+ typedef descriptor_write_op<ConstBufferSequence, Handler, IoExecutor> op;
+ typename op::ptr p = { asio::detail::addressof(handler),
+ op::ptr::allocate(handler), 0 };
+ p.p = new (p.v) op(success_ec_, impl.descriptor_, buffers, handler, io_ex);
+
+ // Optionally register for per-operation cancellation.
+ if (slot.is_connected())
+ {
+ p.p->cancellation_key_ =
+ &slot.template emplace<reactor_op_cancellation>(
+ &reactor_, &impl.reactor_data_,
+ impl.descriptor_, reactor::write_op);
+ }
+
+ ASIO_HANDLER_CREATION((reactor_.context(), *p.p, "descriptor",
+ &impl, impl.descriptor_, "async_write_some"));
+
+ start_op(impl, reactor::write_op, p.p, is_continuation, true,
+ buffer_sequence_adapter<asio::const_buffer,
+ ConstBufferSequence>::all_empty(buffers));
+ p.v = p.p = 0;
+ }
+
+ // Start an asynchronous wait until data can be written without blocking.
+ template <typename Handler, typename IoExecutor>
+ void async_write_some(implementation_type& impl,
+ const null_buffers&, Handler& handler, const IoExecutor& io_ex)
+ {
+ bool is_continuation =
+ asio_handler_cont_helpers::is_continuation(handler);
+
+ typename associated_cancellation_slot<Handler>::type slot
+ = asio::get_associated_cancellation_slot(handler);
+
+ // Allocate and construct an operation to wrap the handler.
+ typedef reactive_null_buffers_op<Handler, IoExecutor> op;
+ typename op::ptr p = { asio::detail::addressof(handler),
+ op::ptr::allocate(handler), 0 };
+ p.p = new (p.v) op(success_ec_, handler, io_ex);
+
+ // Optionally register for per-operation cancellation.
+ if (slot.is_connected())
+ {
+ p.p->cancellation_key_ =
+ &slot.template emplace<reactor_op_cancellation>(
+ &reactor_, &impl.reactor_data_,
+ impl.descriptor_, reactor::write_op);
+ }
+
+ ASIO_HANDLER_CREATION((reactor_.context(), *p.p, "descriptor",
+ &impl, impl.descriptor_, "async_write_some(null_buffers)"));
+
+ start_op(impl, reactor::write_op, p.p, is_continuation, false, false);
+ p.v = p.p = 0;
+ }
+
+ // Read some data from the stream. Returns the number of bytes read.
+ template <typename MutableBufferSequence>
+ size_t read_some(implementation_type& impl,
+ const MutableBufferSequence& buffers, asio::error_code& ec)
+ {
+ typedef buffer_sequence_adapter<asio::mutable_buffer,
+ MutableBufferSequence> bufs_type;
+
+ if (bufs_type::is_single_buffer)
+ {
+ return descriptor_ops::sync_read1(impl.descriptor_,
+ impl.state_, bufs_type::first(buffers).data(),
+ bufs_type::first(buffers).size(), ec);
+ }
+ else
+ {
+ bufs_type bufs(buffers);
+
+ return descriptor_ops::sync_read(impl.descriptor_, impl.state_,
+ bufs.buffers(), bufs.count(), bufs.all_empty(), ec);
+ }
+ }
+
+ // Wait until data can be read without blocking.
+ size_t read_some(implementation_type& impl,
+ const null_buffers&, asio::error_code& ec)
+ {
+ // Wait for descriptor to become ready.
+ descriptor_ops::poll_read(impl.descriptor_, impl.state_, ec);
+
+ return 0;
+ }
+
+ // Start an asynchronous read. The buffer for the data being read must be
+ // valid for the lifetime of the asynchronous operation.
+ template <typename MutableBufferSequence,
+ typename Handler, typename IoExecutor>
+ void async_read_some(implementation_type& impl,
+ const MutableBufferSequence& buffers,
+ Handler& handler, const IoExecutor& io_ex)
+ {
+ bool is_continuation =
+ asio_handler_cont_helpers::is_continuation(handler);
+
+ typename associated_cancellation_slot<Handler>::type slot
+ = asio::get_associated_cancellation_slot(handler);
+
+ // Allocate and construct an operation to wrap the handler.
+ typedef descriptor_read_op<MutableBufferSequence, Handler, IoExecutor> op;
+ typename op::ptr p = { asio::detail::addressof(handler),
+ op::ptr::allocate(handler), 0 };
+ p.p = new (p.v) op(success_ec_, impl.descriptor_, buffers, handler, io_ex);
+
+ // Optionally register for per-operation cancellation.
+ if (slot.is_connected())
+ {
+ p.p->cancellation_key_ =
+ &slot.template emplace<reactor_op_cancellation>(
+ &reactor_, &impl.reactor_data_,
+ impl.descriptor_, reactor::read_op);
+ }
+
+ ASIO_HANDLER_CREATION((reactor_.context(), *p.p, "descriptor",
+ &impl, impl.descriptor_, "async_read_some"));
+
+ start_op(impl, reactor::read_op, p.p, is_continuation, true,
+ buffer_sequence_adapter<asio::mutable_buffer,
+ MutableBufferSequence>::all_empty(buffers));
+ p.v = p.p = 0;
+ }
+
+ // Wait until data can be read without blocking.
+ template <typename Handler, typename IoExecutor>
+ void async_read_some(implementation_type& impl,
+ const null_buffers&, Handler& handler, const IoExecutor& io_ex)
+ {
+ bool is_continuation =
+ asio_handler_cont_helpers::is_continuation(handler);
+
+ typename associated_cancellation_slot<Handler>::type slot
+ = asio::get_associated_cancellation_slot(handler);
+
+ // Allocate and construct an operation to wrap the handler.
+ typedef reactive_null_buffers_op<Handler, IoExecutor> op;
+ typename op::ptr p = { asio::detail::addressof(handler),
+ op::ptr::allocate(handler), 0 };
+ p.p = new (p.v) op(success_ec_, handler, io_ex);
+
+ // Optionally register for per-operation cancellation.
+ if (slot.is_connected())
+ {
+ p.p->cancellation_key_ =
+ &slot.template emplace<reactor_op_cancellation>(
+ &reactor_, &impl.reactor_data_,
+ impl.descriptor_, reactor::read_op);
+ }
+
+ ASIO_HANDLER_CREATION((reactor_.context(), *p.p, "descriptor",
+ &impl, impl.descriptor_, "async_read_some(null_buffers)"));
+
+ start_op(impl, reactor::read_op, p.p, is_continuation, false, false);
+ p.v = p.p = 0;
+ }
+
+private:
+ // Start the asynchronous operation.
+ ASIO_DECL void start_op(implementation_type& impl, int op_type,
+ reactor_op* op, bool is_continuation, bool is_non_blocking, bool noop);
+
+ // Helper class used to implement per-operation cancellation
+ class reactor_op_cancellation
+ {
+ public:
+ reactor_op_cancellation(reactor* r,
+ reactor::per_descriptor_data* p, int d, int o)
+ : reactor_(r),
+ reactor_data_(p),
+ descriptor_(d),
+ op_type_(o)
+ {
+ }
+
+ void operator()(cancellation_type_t type)
+ {
+ if (!!(type &
+ (cancellation_type::terminal
+ | cancellation_type::partial
+ | cancellation_type::total)))
+ {
+ reactor_->cancel_ops_by_key(descriptor_,
+ *reactor_data_, op_type_, this);
+ }
+ }
+
+ private:
+ reactor* reactor_;
+ reactor::per_descriptor_data* reactor_data_;
+ int descriptor_;
+ int op_type_;
+ };
+
+ // The selector that performs event demultiplexing for the service.
+ reactor& reactor_;
+
+ // Cached success value to avoid accessing category singleton.
+ const asio::error_code success_ec_;
+};
+
+} // namespace detail
+} // namespace asio
+
+#include "asio/detail/pop_options.hpp"
+
+#if defined(ASIO_HEADER_ONLY)
+# include "asio/detail/impl/reactive_descriptor_service.ipp"
+#endif // defined(ASIO_HEADER_ONLY)
+
+#endif // !defined(ASIO_WINDOWS)
+ // && !defined(ASIO_WINDOWS_RUNTIME)
+ // && !defined(__CYGWIN__)
+
+#endif // ASIO_DETAIL_REACTIVE_DESCRIPTOR_SERVICE_HPP