boost/asio/detail/win_iocp_socket_service_base.hpp
// // detail/win_iocp_socket_service_base.hpp // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // // Copyright (c) 2003-2023 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 BOOST_ASIO_DETAIL_WIN_IOCP_SOCKET_SERVICE_BASE_HPP #define BOOST_ASIO_DETAIL_WIN_IOCP_SOCKET_SERVICE_BASE_HPP #if defined(_MSC_VER) && (_MSC_VER >= 1200) # pragma once #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) #include <boost/asio/detail/config.hpp> #if defined(BOOST_ASIO_HAS_IOCP) #include <boost/asio/associated_cancellation_slot.hpp> #include <boost/asio/error.hpp> #include <boost/asio/execution_context.hpp> #include <boost/asio/socket_base.hpp> #include <boost/asio/detail/bind_handler.hpp> #include <boost/asio/detail/buffer_sequence_adapter.hpp> #include <boost/asio/detail/fenced_block.hpp> #include <boost/asio/detail/handler_alloc_helpers.hpp> #include <boost/asio/detail/handler_invoke_helpers.hpp> #include <boost/asio/detail/memory.hpp> #include <boost/asio/detail/mutex.hpp> #include <boost/asio/detail/operation.hpp> #include <boost/asio/detail/reactor_op.hpp> #include <boost/asio/detail/select_reactor.hpp> #include <boost/asio/detail/socket_holder.hpp> #include <boost/asio/detail/socket_ops.hpp> #include <boost/asio/detail/socket_types.hpp> #include <boost/asio/detail/win_iocp_io_context.hpp> #include <boost/asio/detail/win_iocp_null_buffers_op.hpp> #include <boost/asio/detail/win_iocp_socket_connect_op.hpp> #include <boost/asio/detail/win_iocp_socket_send_op.hpp> #include <boost/asio/detail/win_iocp_socket_recv_op.hpp> #include <boost/asio/detail/win_iocp_socket_recvmsg_op.hpp> #include <boost/asio/detail/win_iocp_wait_op.hpp> #include <boost/asio/detail/push_options.hpp> namespace boost { namespace asio { namespace detail { class win_iocp_socket_service_base { public: // The implementation type of the socket. struct base_implementation_type { // The native socket representation. socket_type socket_; // The current state of the socket. socket_ops::state_type state_; // We use a shared pointer as a cancellation token here to work around the // broken Windows support for cancellation. MSDN says that when you call // closesocket any outstanding WSARecv or WSASend operations will complete // with the error ERROR_OPERATION_ABORTED. In practice they complete with // ERROR_NETNAME_DELETED, which means you can't tell the difference between // a local cancellation and the socket being hard-closed by the peer. socket_ops::shared_cancel_token_type cancel_token_; // Per-descriptor data used by the reactor. select_reactor::per_descriptor_data reactor_data_; #if defined(BOOST_ASIO_ENABLE_CANCELIO) // The ID of the thread from which it is safe to cancel asynchronous // operations. 0 means no asynchronous operations have been started yet. // ~0 means asynchronous operations have been started from more than one // thread, and cancellation is not supported for the socket. DWORD safe_cancellation_thread_id_; #endif // defined(BOOST_ASIO_ENABLE_CANCELIO) // Pointers to adjacent socket implementations in linked list. base_implementation_type* next_; base_implementation_type* prev_; }; // Constructor. BOOST_ASIO_DECL win_iocp_socket_service_base(execution_context& context); // Destroy all user-defined handler objects owned by the service. BOOST_ASIO_DECL void base_shutdown(); // Construct a new socket implementation. BOOST_ASIO_DECL void construct(base_implementation_type& impl); // Move-construct a new socket implementation. BOOST_ASIO_DECL void base_move_construct(base_implementation_type& impl, base_implementation_type& other_impl) BOOST_ASIO_NOEXCEPT; // Move-assign from another socket implementation. BOOST_ASIO_DECL void base_move_assign(base_implementation_type& impl, win_iocp_socket_service_base& other_service, base_implementation_type& other_impl); // Destroy a socket implementation. BOOST_ASIO_DECL void destroy(base_implementation_type& impl); // Determine whether the socket is open. bool is_open(const base_implementation_type& impl) const { return impl.socket_ != invalid_socket; } // Destroy a socket implementation. BOOST_ASIO_DECL boost::system::error_code close( base_implementation_type& impl, boost::system::error_code& ec); // Release ownership of the socket. BOOST_ASIO_DECL socket_type release( base_implementation_type& impl, boost::system::error_code& ec); // Cancel all operations associated with the socket. BOOST_ASIO_DECL boost::system::error_code cancel( base_implementation_type& impl, boost::system::error_code& ec); // Determine whether the socket is at the out-of-band data mark. bool at_mark(const base_implementation_type& impl, boost::system::error_code& ec) const { return socket_ops::sockatmark(impl.socket_, ec); } // Determine the number of bytes available for reading. std::size_t available(const base_implementation_type& impl, boost::system::error_code& ec) const { return socket_ops::available(impl.socket_, ec); } // Place the socket into the state where it will listen for new connections. boost::system::error_code listen(base_implementation_type& impl, int backlog, boost::system::error_code& ec) { socket_ops::listen(impl.socket_, backlog, ec); return ec; } // Perform an IO control command on the socket. template <typename IO_Control_Command> boost::system::error_code io_control(base_implementation_type& impl, IO_Control_Command& command, boost::system::error_code& ec) { socket_ops::ioctl(impl.socket_, impl.state_, command.name(), static_cast<ioctl_arg_type*>(command.data()), ec); return ec; } // Gets the non-blocking mode of the socket. bool non_blocking(const base_implementation_type& impl) const { return (impl.state_ & socket_ops::user_set_non_blocking) != 0; } // Sets the non-blocking mode of the socket. boost::system::error_code non_blocking(base_implementation_type& impl, bool mode, boost::system::error_code& ec) { socket_ops::set_user_non_blocking(impl.socket_, impl.state_, mode, ec); return ec; } // Gets the non-blocking mode of the native socket implementation. bool native_non_blocking(const base_implementation_type& impl) const { return (impl.state_ & socket_ops::internal_non_blocking) != 0; } // Sets the non-blocking mode of the native socket implementation. boost::system::error_code native_non_blocking(base_implementation_type& impl, bool mode, boost::system::error_code& ec) { socket_ops::set_internal_non_blocking(impl.socket_, impl.state_, mode, ec); return ec; } // Wait for the socket to become ready to read, ready to write, or to have // pending error conditions. boost::system::error_code wait(base_implementation_type& impl, socket_base::wait_type w, boost::system::error_code& ec) { switch (w) { case socket_base::wait_read: socket_ops::poll_read(impl.socket_, impl.state_, -1, ec); break; case socket_base::wait_write: socket_ops::poll_write(impl.socket_, impl.state_, -1, ec); break; case socket_base::wait_error: socket_ops::poll_error(impl.socket_, impl.state_, -1, ec); break; default: ec = boost::asio::error::invalid_argument; break; } return ec; } // Asynchronously wait for the socket to become ready to read, ready to // write, or to have pending error conditions. template <typename Handler, typename IoExecutor> void async_wait(base_implementation_type& impl, socket_base::wait_type w, Handler& handler, const IoExecutor& io_ex) { typename associated_cancellation_slot<Handler>::type slot = boost::asio::get_associated_cancellation_slot(handler); bool is_continuation = boost_asio_handler_cont_helpers::is_continuation(handler); // Allocate and construct an operation to wrap the handler. typedef win_iocp_wait_op<Handler, IoExecutor> op; typename op::ptr p = { boost::asio::detail::addressof(handler), op::ptr::allocate(handler), 0 }; p.p = new (p.v) op(impl.cancel_token_, handler, io_ex); BOOST_ASIO_HANDLER_CREATION((context_, *p.p, "socket", &impl, impl.socket_, "async_wait")); // Optionally register for per-operation cancellation. operation* iocp_op = p.p; if (slot.is_connected()) { p.p->cancellation_key_ = iocp_op = &slot.template emplace<reactor_op_cancellation>( impl.socket_, iocp_op); } int op_type = -1; switch (w) { case socket_base::wait_read: op_type = start_null_buffers_receive_op(impl, 0, p.p, iocp_op); break; case socket_base::wait_write: op_type = select_reactor::write_op; start_reactor_op(impl, select_reactor::write_op, p.p); break; case socket_base::wait_error: op_type = select_reactor::read_op; start_reactor_op(impl, select_reactor::except_op, p.p); break; default: p.p->ec_ = boost::asio::error::invalid_argument; iocp_service_.post_immediate_completion(p.p, is_continuation); break; } p.v = p.p = 0; // Update cancellation method if the reactor was used. if (slot.is_connected() && op_type != -1) { static_cast<reactor_op_cancellation*>(iocp_op)->use_reactor( &get_reactor(), &impl.reactor_data_, op_type); } } // Send the given data to the peer. Returns the number of bytes sent. template <typename ConstBufferSequence> size_t send(base_implementation_type& impl, const ConstBufferSequence& buffers, socket_base::message_flags flags, boost::system::error_code& ec) { buffer_sequence_adapter<boost::asio::const_buffer, ConstBufferSequence> bufs(buffers); return socket_ops::sync_send(impl.socket_, impl.state_, bufs.buffers(), bufs.count(), flags, bufs.all_empty(), ec); } // Wait until data can be sent without blocking. size_t send(base_implementation_type& impl, const null_buffers&, socket_base::message_flags, boost::system::error_code& ec) { // Wait for socket to become ready. socket_ops::poll_write(impl.socket_, impl.state_, -1, ec); return 0; } // Start an asynchronous send. The data being sent must be valid for the // lifetime of the asynchronous operation. template <typename ConstBufferSequence, typename Handler, typename IoExecutor> void async_send(base_implementation_type& impl, const ConstBufferSequence& buffers, socket_base::message_flags flags, Handler& handler, const IoExecutor& io_ex) { typename associated_cancellation_slot<Handler>::type slot = boost::asio::get_associated_cancellation_slot(handler); // Allocate and construct an operation to wrap the handler. typedef win_iocp_socket_send_op< ConstBufferSequence, Handler, IoExecutor> op; typename op::ptr p = { boost::asio::detail::addressof(handler), op::ptr::allocate(handler), 0 }; operation* o = p.p = new (p.v) op( impl.cancel_token_, buffers, handler, io_ex); BOOST_ASIO_HANDLER_CREATION((context_, *p.p, "socket", &impl, impl.socket_, "async_send")); buffer_sequence_adapter<boost::asio::const_buffer, ConstBufferSequence> bufs(buffers); // Optionally register for per-operation cancellation. if (slot.is_connected()) o = &slot.template emplace<iocp_op_cancellation>(impl.socket_, o); start_send_op(impl, bufs.buffers(), bufs.count(), flags, (impl.state_ & socket_ops::stream_oriented) != 0 && bufs.all_empty(), o); p.v = p.p = 0; } // Start an asynchronous wait until data can be sent without blocking. template <typename Handler, typename IoExecutor> void async_send(base_implementation_type& impl, const null_buffers&, socket_base::message_flags, Handler& handler, const IoExecutor& io_ex) { // Allocate and construct an operation to wrap the handler. typedef win_iocp_null_buffers_op<Handler, IoExecutor> op; typename op::ptr p = { boost::asio::detail::addressof(handler), op::ptr::allocate(handler), 0 }; p.p = new (p.v) op(impl.cancel_token_, handler, io_ex); BOOST_ASIO_HANDLER_CREATION((context_, *p.p, "socket", &impl, impl.socket_, "async_send(null_buffers)")); start_reactor_op(impl, select_reactor::write_op, p.p); p.v = p.p = 0; } // Receive some data from the peer. Returns the number of bytes received. template <typename MutableBufferSequence> size_t receive(base_implementation_type& impl, const MutableBufferSequence& buffers, socket_base::message_flags flags, boost::system::error_code& ec) { buffer_sequence_adapter<boost::asio::mutable_buffer, MutableBufferSequence> bufs(buffers); return socket_ops::sync_recv(impl.socket_, impl.state_, bufs.buffers(), bufs.count(), flags, bufs.all_empty(), ec); } // Wait until data can be received without blocking. size_t receive(base_implementation_type& impl, const null_buffers&, socket_base::message_flags, boost::system::error_code& ec) { // Wait for socket to become ready. socket_ops::poll_read(impl.socket_, impl.state_, -1, ec); return 0; } // Start an asynchronous receive. The buffer for the data being received // must be valid for the lifetime of the asynchronous operation. template <typename MutableBufferSequence, typename Handler, typename IoExecutor> void async_receive(base_implementation_type& impl, const MutableBufferSequence& buffers, socket_base::message_flags flags, Handler& handler, const IoExecutor& io_ex) { typename associated_cancellation_slot<Handler>::type slot = boost::asio::get_associated_cancellation_slot(handler); // Allocate and construct an operation to wrap the handler. typedef win_iocp_socket_recv_op< MutableBufferSequence, Handler, IoExecutor> op; typename op::ptr p = { boost::asio::detail::addressof(handler), op::ptr::allocate(handler), 0 }; operation* o = p.p = new (p.v) op(impl.state_, impl.cancel_token_, buffers, handler, io_ex); BOOST_ASIO_HANDLER_CREATION((context_, *p.p, "socket", &impl, impl.socket_, "async_receive")); buffer_sequence_adapter<boost::asio::mutable_buffer, MutableBufferSequence> bufs(buffers); // Optionally register for per-operation cancellation. if (slot.is_connected()) o = &slot.template emplace<iocp_op_cancellation>(impl.socket_, o); start_receive_op(impl, bufs.buffers(), bufs.count(), flags, (impl.state_ & socket_ops::stream_oriented) != 0 && bufs.all_empty(), o); p.v = p.p = 0; } // Wait until data can be received without blocking. template <typename Handler, typename IoExecutor> void async_receive(base_implementation_type& impl, const null_buffers&, socket_base::message_flags flags, Handler& handler, const IoExecutor& io_ex) { typename associated_cancellation_slot<Handler>::type slot = boost::asio::get_associated_cancellation_slot(handler); // Allocate and construct an operation to wrap the handler. typedef win_iocp_null_buffers_op<Handler, IoExecutor> op; typename op::ptr p = { boost::asio::detail::addressof(handler), op::ptr::allocate(handler), 0 }; p.p = new (p.v) op(impl.cancel_token_, handler, io_ex); BOOST_ASIO_HANDLER_CREATION((context_, *p.p, "socket", &impl, impl.socket_, "async_receive(null_buffers)")); // Optionally register for per-operation cancellation. operation* iocp_op = p.p; if (slot.is_connected()) { p.p->cancellation_key_ = iocp_op = &slot.template emplace<reactor_op_cancellation>( impl.socket_, iocp_op); } int op_type = start_null_buffers_receive_op(impl, flags, p.p, iocp_op); p.v = p.p = 0; // Update cancellation method if the reactor was used. if (slot.is_connected() && op_type != -1) { static_cast<reactor_op_cancellation*>(iocp_op)->use_reactor( &get_reactor(), &impl.reactor_data_, op_type); } } // Receive some data with associated flags. Returns the number of bytes // received. template <typename MutableBufferSequence> size_t receive_with_flags(base_implementation_type& impl, const MutableBufferSequence& buffers, socket_base::message_flags in_flags, socket_base::message_flags& out_flags, boost::system::error_code& ec) { buffer_sequence_adapter<boost::asio::mutable_buffer, MutableBufferSequence> bufs(buffers); return socket_ops::sync_recvmsg(impl.socket_, impl.state_, bufs.buffers(), bufs.count(), in_flags, out_flags, ec); } // Wait until data can be received without blocking. size_t receive_with_flags(base_implementation_type& impl, const null_buffers&, socket_base::message_flags, socket_base::message_flags& out_flags, boost::system::error_code& ec) { // Wait for socket to become ready. socket_ops::poll_read(impl.socket_, impl.state_, -1, ec); // Clear out_flags, since we cannot give it any other sensible value when // performing a null_buffers operation. out_flags = 0; return 0; } // Start an asynchronous receive. The buffer for the data being received // must be valid for the lifetime of the asynchronous operation. template <typename MutableBufferSequence, typename Handler, typename IoExecutor> void async_receive_with_flags(base_implementation_type& impl, const MutableBufferSequence& buffers, socket_base::message_flags in_flags, socket_base::message_flags& out_flags, Handler& handler, const IoExecutor& io_ex) { typename associated_cancellation_slot<Handler>::type slot = boost::asio::get_associated_cancellation_slot(handler); // Allocate and construct an operation to wrap the handler. typedef win_iocp_socket_recvmsg_op< MutableBufferSequence, Handler, IoExecutor> op; typename op::ptr p = { boost::asio::detail::addressof(handler), op::ptr::allocate(handler), 0 }; operation* o = p.p = new (p.v) op(impl.cancel_token_, buffers, out_flags, handler, io_ex); BOOST_ASIO_HANDLER_CREATION((context_, *p.p, "socket", &impl, impl.socket_, "async_receive_with_flags")); buffer_sequence_adapter<boost::asio::mutable_buffer, MutableBufferSequence> bufs(buffers); // Optionally register for per-operation cancellation. if (slot.is_connected()) o = &slot.template emplace<iocp_op_cancellation>(impl.socket_, o); start_receive_op(impl, bufs.buffers(), bufs.count(), in_flags, false, o); p.v = p.p = 0; } // Wait until data can be received without blocking. template <typename Handler, typename IoExecutor> void async_receive_with_flags(base_implementation_type& impl, const null_buffers&, socket_base::message_flags in_flags, socket_base::message_flags& out_flags, Handler& handler, const IoExecutor& io_ex) { typename associated_cancellation_slot<Handler>::type slot = boost::asio::get_associated_cancellation_slot(handler); // Allocate and construct an operation to wrap the handler. typedef win_iocp_null_buffers_op<Handler, IoExecutor> op; typename op::ptr p = { boost::asio::detail::addressof(handler), op::ptr::allocate(handler), 0 }; p.p = new (p.v) op(impl.cancel_token_, handler, io_ex); BOOST_ASIO_HANDLER_CREATION((context_, *p.p, "socket", &impl, impl.socket_, "async_receive_with_flags(null_buffers)")); // Reset out_flags since it can be given no sensible value at this time. out_flags = 0; // Optionally register for per-operation cancellation. operation* iocp_op = p.p; if (slot.is_connected()) { p.p->cancellation_key_ = iocp_op = &slot.template emplace<reactor_op_cancellation>( impl.socket_, iocp_op); } int op_type = start_null_buffers_receive_op(impl, in_flags, p.p, iocp_op); p.v = p.p = 0; // Update cancellation method if the reactor was used. if (slot.is_connected() && op_type != -1) { static_cast<reactor_op_cancellation*>(iocp_op)->use_reactor( &get_reactor(), &impl.reactor_data_, op_type); } } // Helper function to restart an asynchronous accept operation. BOOST_ASIO_DECL void restart_accept_op(socket_type s, socket_holder& new_socket, int family, int type, int protocol, void* output_buffer, DWORD address_length, long* cancel_requested, operation* op); protected: // Open a new socket implementation. BOOST_ASIO_DECL boost::system::error_code do_open( base_implementation_type& impl, int family, int type, int protocol, boost::system::error_code& ec); // Assign a native socket to a socket implementation. BOOST_ASIO_DECL boost::system::error_code do_assign( base_implementation_type& impl, int type, socket_type native_socket, boost::system::error_code& ec); // Helper function to start an asynchronous send operation. BOOST_ASIO_DECL void start_send_op(base_implementation_type& impl, WSABUF* buffers, std::size_t buffer_count, socket_base::message_flags flags, bool noop, operation* op); // Helper function to start an asynchronous send_to operation. BOOST_ASIO_DECL void start_send_to_op(base_implementation_type& impl, WSABUF* buffers, std::size_t buffer_count, const void* addr, int addrlen, socket_base::message_flags flags, operation* op); // Helper function to start an asynchronous receive operation. BOOST_ASIO_DECL void start_receive_op(base_implementation_type& impl, WSABUF* buffers, std::size_t buffer_count, socket_base::message_flags flags, bool noop, operation* op); // Helper function to start an asynchronous null_buffers receive operation. BOOST_ASIO_DECL int start_null_buffers_receive_op( base_implementation_type& impl, socket_base::message_flags flags, reactor_op* op, operation* iocp_op); // Helper function to start an asynchronous receive_from operation. BOOST_ASIO_DECL void start_receive_from_op(base_implementation_type& impl, WSABUF* buffers, std::size_t buffer_count, void* addr, socket_base::message_flags flags, int* addrlen, operation* op); // Helper function to start an asynchronous accept operation. BOOST_ASIO_DECL void start_accept_op(base_implementation_type& impl, bool peer_is_open, socket_holder& new_socket, int family, int type, int protocol, void* output_buffer, DWORD address_length, operation* op); // Start an asynchronous read or write operation using the reactor. BOOST_ASIO_DECL void start_reactor_op(base_implementation_type& impl, int op_type, reactor_op* op); // Start the asynchronous connect operation using the reactor. BOOST_ASIO_DECL int start_connect_op(base_implementation_type& impl, int family, int type, const void* remote_addr, std::size_t remote_addrlen, win_iocp_socket_connect_op_base* op, operation* iocp_op); // Helper function to close a socket when the associated object is being // destroyed. BOOST_ASIO_DECL void close_for_destruction(base_implementation_type& impl); // Update the ID of the thread from which cancellation is safe. BOOST_ASIO_DECL void update_cancellation_thread_id( base_implementation_type& impl); // Helper function to get the reactor. If no reactor has been created yet, a // new one is obtained from the execution context and a pointer to it is // cached in this service. BOOST_ASIO_DECL select_reactor& get_reactor(); // The type of a ConnectEx function pointer, as old SDKs may not provide it. typedef BOOL (PASCAL *connect_ex_fn)(SOCKET, const socket_addr_type*, int, void*, DWORD, DWORD*, OVERLAPPED*); // Helper function to get the ConnectEx pointer. If no ConnectEx pointer has // been obtained yet, one is obtained using WSAIoctl and the pointer is // cached. Returns a null pointer if ConnectEx is not available. BOOST_ASIO_DECL connect_ex_fn get_connect_ex( base_implementation_type& impl, int type); // The type of a NtSetInformationFile function pointer. typedef LONG (NTAPI *nt_set_info_fn)(HANDLE, ULONG_PTR*, void*, ULONG, ULONG); // Helper function to get the NtSetInformationFile function pointer. If no // NtSetInformationFile pointer has been obtained yet, one is obtained using // GetProcAddress and the pointer is cached. Returns a null pointer if // NtSetInformationFile is not available. BOOST_ASIO_DECL nt_set_info_fn get_nt_set_info(); // Helper function to emulate InterlockedCompareExchangePointer functionality // for: // - very old Platform SDKs; and // - platform SDKs where MSVC's /Wp64 option causes spurious warnings. BOOST_ASIO_DECL void* interlocked_compare_exchange_pointer( void** dest, void* exch, void* cmp); // Helper function to emulate InterlockedExchangePointer functionality for: // - very old Platform SDKs; and // - platform SDKs where MSVC's /Wp64 option causes spurious warnings. BOOST_ASIO_DECL void* interlocked_exchange_pointer(void** dest, void* val); // Helper class used to implement per operation cancellation. class iocp_op_cancellation : public operation { public: iocp_op_cancellation(SOCKET s, operation* target) : operation(&iocp_op_cancellation::do_complete), socket_(s), target_(target) { } static void do_complete(void* owner, operation* base, const boost::system::error_code& result_ec, std::size_t bytes_transferred) { iocp_op_cancellation* o = static_cast<iocp_op_cancellation*>(base); o->target_->complete(owner, result_ec, bytes_transferred); } void operator()(cancellation_type_t type) { #if defined(_WIN32_WINNT) && (_WIN32_WINNT >= 0x0600) if (!!(type & (cancellation_type::terminal | cancellation_type::partial | cancellation_type::total))) { HANDLE sock_as_handle = reinterpret_cast<HANDLE>(socket_); ::CancelIoEx(sock_as_handle, this); } #else // defined(_WIN32_WINNT) && (_WIN32_WINNT >= 0x0600) (void)type; #endif // defined(_WIN32_WINNT) && (_WIN32_WINNT >= 0x0600) } private: SOCKET socket_; operation* target_; }; // Helper class used to implement per operation cancellation. class accept_op_cancellation : public operation { public: accept_op_cancellation(SOCKET s, operation* target) : operation(&iocp_op_cancellation::do_complete), socket_(s), target_(target), cancel_requested_(0) { } static void do_complete(void* owner, operation* base, const boost::system::error_code& result_ec, std::size_t bytes_transferred) { accept_op_cancellation* o = static_cast<accept_op_cancellation*>(base); o->target_->complete(owner, result_ec, bytes_transferred); } long* get_cancel_requested() { return &cancel_requested_; } void operator()(cancellation_type_t type) { #if defined(_WIN32_WINNT) && (_WIN32_WINNT >= 0x0600) if (!!(type & (cancellation_type::terminal | cancellation_type::partial | cancellation_type::total))) { HANDLE sock_as_handle = reinterpret_cast<HANDLE>(socket_); ::CancelIoEx(sock_as_handle, this); } #else // defined(_WIN32_WINNT) && (_WIN32_WINNT >= 0x0600) (void)type; #endif // defined(_WIN32_WINNT) && (_WIN32_WINNT >= 0x0600) } private: SOCKET socket_; operation* target_; long cancel_requested_; }; // Helper class used to implement per operation cancellation. class reactor_op_cancellation : public operation { public: reactor_op_cancellation(SOCKET s, operation* base) : operation(&reactor_op_cancellation::do_complete), socket_(s), target_(base), reactor_(0), reactor_data_(0), op_type_(-1) { } void use_reactor(select_reactor* r, select_reactor::per_descriptor_data* p, int o) { reactor_ = r; reactor_data_ = p; op_type_ = o; } static void do_complete(void* owner, operation* base, const boost::system::error_code& result_ec, std::size_t bytes_transferred) { reactor_op_cancellation* o = static_cast<reactor_op_cancellation*>(base); o->target_->complete(owner, result_ec, bytes_transferred); } void operator()(cancellation_type_t type) { if (!!(type & (cancellation_type::terminal | cancellation_type::partial | cancellation_type::total))) { if (reactor_) { reactor_->cancel_ops_by_key(socket_, *reactor_data_, op_type_, this); } else { #if defined(_WIN32_WINNT) && (_WIN32_WINNT >= 0x0600) HANDLE sock_as_handle = reinterpret_cast<HANDLE>(socket_); ::CancelIoEx(sock_as_handle, this); #endif // defined(_WIN32_WINNT) && (_WIN32_WINNT >= 0x0600) } } } private: SOCKET socket_; operation* target_; select_reactor* reactor_; select_reactor::per_descriptor_data* reactor_data_; int op_type_; }; // The execution context used to obtain the reactor, if required. execution_context& context_; // The IOCP service used for running asynchronous operations and dispatching // handlers. win_iocp_io_context& iocp_service_; // The reactor used for performing connect operations. This object is created // only if needed. select_reactor* reactor_; // Pointer to ConnectEx implementation. void* connect_ex_; // Pointer to NtSetInformationFile implementation. void* nt_set_info_; // Mutex to protect access to the linked list of implementations. boost::asio::detail::mutex mutex_; // The head of a linked list of all implementations. base_implementation_type* impl_list_; }; } // namespace detail } // namespace asio } // namespace boost #include <boost/asio/detail/pop_options.hpp> #if defined(BOOST_ASIO_HEADER_ONLY) # include <boost/asio/detail/impl/win_iocp_socket_service_base.ipp> #endif // defined(BOOST_ASIO_HEADER_ONLY) #endif // defined(BOOST_ASIO_HAS_IOCP) #endif // BOOST_ASIO_DETAIL_WIN_IOCP_SOCKET_SERVICE_BASE_HPP