| // |
| // detail/reactive_descriptor_service.hpp |
| // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| // |
| // Copyright (c) 2003-2016 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/buffer.hpp" |
| #include "asio/io_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 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( |
| asio::io_context& io_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); |
| |
| // 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> |
| void async_wait(implementation_type& impl, |
| posix::descriptor_base::wait_type w, Handler& handler) |
| { |
| bool is_continuation = |
| asio_handler_cont_helpers::is_continuation(handler); |
| |
| // Allocate and construct an operation to wrap the handler. |
| typedef reactive_wait_op<Handler> op; |
| typename op::ptr p = { asio::detail::addressof(handler), |
| op::ptr::allocate(handler), 0 }; |
| p.p = new (p.v) op(handler); |
| |
| 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; |
| } |
| |
| 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) |
| { |
| buffer_sequence_adapter<asio::const_buffer, |
| ConstBufferSequence> 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> |
| void async_write_some(implementation_type& impl, |
| const ConstBufferSequence& buffers, Handler& handler) |
| { |
| bool is_continuation = |
| asio_handler_cont_helpers::is_continuation(handler); |
| |
| // Allocate and construct an operation to wrap the handler. |
| typedef descriptor_write_op<ConstBufferSequence, Handler> op; |
| typename op::ptr p = { asio::detail::addressof(handler), |
| op::ptr::allocate(handler), 0 }; |
| p.p = new (p.v) op(impl.descriptor_, buffers, handler); |
| |
| 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> |
| void async_write_some(implementation_type& impl, |
| const null_buffers&, Handler& handler) |
| { |
| bool is_continuation = |
| asio_handler_cont_helpers::is_continuation(handler); |
| |
| // Allocate and construct an operation to wrap the handler. |
| typedef reactive_null_buffers_op<Handler> op; |
| typename op::ptr p = { asio::detail::addressof(handler), |
| op::ptr::allocate(handler), 0 }; |
| p.p = new (p.v) op(handler); |
| |
| 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) |
| { |
| buffer_sequence_adapter<asio::mutable_buffer, |
| MutableBufferSequence> 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> |
| void async_read_some(implementation_type& impl, |
| const MutableBufferSequence& buffers, Handler& handler) |
| { |
| bool is_continuation = |
| asio_handler_cont_helpers::is_continuation(handler); |
| |
| // Allocate and construct an operation to wrap the handler. |
| typedef descriptor_read_op<MutableBufferSequence, Handler> op; |
| typename op::ptr p = { asio::detail::addressof(handler), |
| op::ptr::allocate(handler), 0 }; |
| p.p = new (p.v) op(impl.descriptor_, buffers, handler); |
| |
| 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> |
| void async_read_some(implementation_type& impl, |
| const null_buffers&, Handler& handler) |
| { |
| bool is_continuation = |
| asio_handler_cont_helpers::is_continuation(handler); |
| |
| // Allocate and construct an operation to wrap the handler. |
| typedef reactive_null_buffers_op<Handler> op; |
| typename op::ptr p = { asio::detail::addressof(handler), |
| op::ptr::allocate(handler), 0 }; |
| p.p = new (p.v) op(handler); |
| |
| 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); |
| |
| // The selector that performs event demultiplexing for the service. |
| reactor& reactor_; |
| }; |
| |
| } // 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 |