1 // 2 // detail/winrt_socket_recv_op.hpp 3 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 4 // 5 // Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com) 6 // 7 // Distributed under the Boost Software License, Version 1.0. (See accompanying 8 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) 9 // 10 11 #ifndef BOOST_ASIO_DETAIL_WINRT_SOCKET_RECV_OP_HPP 12 #define BOOST_ASIO_DETAIL_WINRT_SOCKET_RECV_OP_HPP 13 14 #if defined(_MSC_VER) && (_MSC_VER >= 1200) 15 # pragma once 16 #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) 17 18 #include <boost/asio/detail/config.hpp> 19 20 #if defined(BOOST_ASIO_WINDOWS_RUNTIME) 21 22 #include <boost/asio/detail/bind_handler.hpp> 23 #include <boost/asio/detail/buffer_sequence_adapter.hpp> 24 #include <boost/asio/detail/fenced_block.hpp> 25 #include <boost/asio/detail/handler_alloc_helpers.hpp> 26 #include <boost/asio/detail/handler_invoke_helpers.hpp> 27 #include <boost/asio/detail/handler_work.hpp> 28 #include <boost/asio/detail/memory.hpp> 29 #include <boost/asio/detail/winrt_async_op.hpp> 30 #include <boost/asio/error.hpp> 31 32 #include <boost/asio/detail/push_options.hpp> 33 34 namespace boost { 35 namespace asio { 36 namespace detail { 37 38 template <typename MutableBufferSequence, typename Handler, typename IoExecutor> 39 class winrt_socket_recv_op : 40 public winrt_async_op<Windows::Storage::Streams::IBuffer^> 41 { 42 public: 43 BOOST_ASIO_DEFINE_HANDLER_PTR(winrt_socket_recv_op); 44 winrt_socket_recv_op(const MutableBufferSequence & buffers,Handler & handler,const IoExecutor & io_ex)45 winrt_socket_recv_op(const MutableBufferSequence& buffers, 46 Handler& handler, const IoExecutor& io_ex) 47 : winrt_async_op<Windows::Storage::Streams::IBuffer^>( 48 &winrt_socket_recv_op::do_complete), 49 buffers_(buffers), 50 handler_(BOOST_ASIO_MOVE_CAST(Handler)(handler)), 51 work_(handler_, io_ex) 52 { 53 } 54 do_complete(void * owner,operation * base,const boost::system::error_code &,std::size_t)55 static void do_complete(void* owner, operation* base, 56 const boost::system::error_code&, std::size_t) 57 { 58 // Take ownership of the operation object. 59 winrt_socket_recv_op* o(static_cast<winrt_socket_recv_op*>(base)); 60 ptr p = { boost::asio::detail::addressof(o->handler_), o, o }; 61 62 BOOST_ASIO_HANDLER_COMPLETION((*o)); 63 64 // Take ownership of the operation's outstanding work. 65 handler_work<Handler, IoExecutor> w( 66 BOOST_ASIO_MOVE_CAST2(handler_work<Handler, IoExecutor>)( 67 o->work_)); 68 69 #if defined(BOOST_ASIO_ENABLE_BUFFER_DEBUGGING) 70 // Check whether buffers are still valid. 71 if (owner) 72 { 73 buffer_sequence_adapter<boost::asio::mutable_buffer, 74 MutableBufferSequence>::validate(o->buffers_); 75 } 76 #endif // defined(BOOST_ASIO_ENABLE_BUFFER_DEBUGGING) 77 78 std::size_t bytes_transferred = o->result_ ? o->result_->Length : 0; 79 if (bytes_transferred == 0 && !o->ec_ && 80 !buffer_sequence_adapter<boost::asio::mutable_buffer, 81 MutableBufferSequence>::all_empty(o->buffers_)) 82 { 83 o->ec_ = boost::asio::error::eof; 84 } 85 86 // Make a copy of the handler so that the memory can be deallocated before 87 // the upcall is made. Even if we're not about to make an upcall, a 88 // sub-object of the handler may be the true owner of the memory associated 89 // with the handler. Consequently, a local copy of the handler is required 90 // to ensure that any owning sub-object remains valid until after we have 91 // deallocated the memory here. 92 detail::binder2<Handler, boost::system::error_code, std::size_t> 93 handler(o->handler_, o->ec_, bytes_transferred); 94 p.h = boost::asio::detail::addressof(handler.handler_); 95 p.reset(); 96 97 // Make the upcall if required. 98 if (owner) 99 { 100 fenced_block b(fenced_block::half); 101 BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_, handler.arg2_)); 102 w.complete(handler, handler.handler_); 103 BOOST_ASIO_HANDLER_INVOCATION_END; 104 } 105 } 106 107 private: 108 MutableBufferSequence buffers_; 109 Handler handler_; 110 handler_work<Handler, IoExecutor> executor_; 111 }; 112 113 } // namespace detail 114 } // namespace asio 115 } // namespace boost 116 117 #include <boost/asio/detail/pop_options.hpp> 118 119 #endif // defined(BOOST_ASIO_WINDOWS_RUNTIME) 120 121 #endif // BOOST_ASIO_DETAIL_WINRT_SOCKET_RECV_OP_HPP 122