annotate DEPENDENCIES/generic/include/boost/asio/detail/wait_handler.hpp @ 133:4acb5d8d80b6 tip

Don't fail environmental check if README.md exists (but .txt and no-suffix don't)
author Chris Cannam
date Tue, 30 Jul 2019 12:25:44 +0100
parents c530137014c0
children
rev   line source
Chris@16 1 //
Chris@16 2 // detail/wait_handler.hpp
Chris@16 3 // ~~~~~~~~~~~~~~~~~~~~~~~
Chris@16 4 //
Chris@101 5 // Copyright (c) 2003-2015 Christopher M. Kohlhoff (chris at kohlhoff dot com)
Chris@16 6 //
Chris@16 7 // Distributed under the Boost Software License, Version 1.0. (See accompanying
Chris@16 8 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16 9 //
Chris@16 10
Chris@16 11 #ifndef BOOST_ASIO_DETAIL_WAIT_HANDLER_HPP
Chris@16 12 #define BOOST_ASIO_DETAIL_WAIT_HANDLER_HPP
Chris@16 13
Chris@16 14 #if defined(_MSC_VER) && (_MSC_VER >= 1200)
Chris@16 15 # pragma once
Chris@16 16 #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
Chris@16 17
Chris@16 18 #include <boost/asio/detail/config.hpp>
Chris@16 19 #include <boost/asio/detail/addressof.hpp>
Chris@16 20 #include <boost/asio/detail/fenced_block.hpp>
Chris@16 21 #include <boost/asio/detail/handler_alloc_helpers.hpp>
Chris@16 22 #include <boost/asio/detail/handler_invoke_helpers.hpp>
Chris@16 23 #include <boost/asio/detail/wait_op.hpp>
Chris@16 24 #include <boost/asio/io_service.hpp>
Chris@16 25
Chris@16 26 #include <boost/asio/detail/push_options.hpp>
Chris@16 27
Chris@16 28 namespace boost {
Chris@16 29 namespace asio {
Chris@16 30 namespace detail {
Chris@16 31
Chris@16 32 template <typename Handler>
Chris@16 33 class wait_handler : public wait_op
Chris@16 34 {
Chris@16 35 public:
Chris@16 36 BOOST_ASIO_DEFINE_HANDLER_PTR(wait_handler);
Chris@16 37
Chris@16 38 wait_handler(Handler& h)
Chris@16 39 : wait_op(&wait_handler::do_complete),
Chris@16 40 handler_(BOOST_ASIO_MOVE_CAST(Handler)(h))
Chris@16 41 {
Chris@16 42 }
Chris@16 43
Chris@16 44 static void do_complete(io_service_impl* owner, operation* base,
Chris@16 45 const boost::system::error_code& /*ec*/,
Chris@16 46 std::size_t /*bytes_transferred*/)
Chris@16 47 {
Chris@16 48 // Take ownership of the handler object.
Chris@16 49 wait_handler* h(static_cast<wait_handler*>(base));
Chris@16 50 ptr p = { boost::asio::detail::addressof(h->handler_), h, h };
Chris@16 51
Chris@16 52 BOOST_ASIO_HANDLER_COMPLETION((h));
Chris@16 53
Chris@16 54 // Make a copy of the handler so that the memory can be deallocated before
Chris@16 55 // the upcall is made. Even if we're not about to make an upcall, a
Chris@16 56 // sub-object of the handler may be the true owner of the memory associated
Chris@16 57 // with the handler. Consequently, a local copy of the handler is required
Chris@16 58 // to ensure that any owning sub-object remains valid until after we have
Chris@16 59 // deallocated the memory here.
Chris@16 60 detail::binder1<Handler, boost::system::error_code>
Chris@16 61 handler(h->handler_, h->ec_);
Chris@16 62 p.h = boost::asio::detail::addressof(handler.handler_);
Chris@16 63 p.reset();
Chris@16 64
Chris@16 65 // Make the upcall if required.
Chris@16 66 if (owner)
Chris@16 67 {
Chris@16 68 fenced_block b(fenced_block::half);
Chris@16 69 BOOST_ASIO_HANDLER_INVOCATION_BEGIN((handler.arg1_));
Chris@16 70 boost_asio_handler_invoke_helpers::invoke(handler, handler.handler_);
Chris@16 71 BOOST_ASIO_HANDLER_INVOCATION_END;
Chris@16 72 }
Chris@16 73 }
Chris@16 74
Chris@16 75 private:
Chris@16 76 Handler handler_;
Chris@16 77 };
Chris@16 78
Chris@16 79 } // namespace detail
Chris@16 80 } // namespace asio
Chris@16 81 } // namespace boost
Chris@16 82
Chris@16 83 #include <boost/asio/detail/pop_options.hpp>
Chris@16 84
Chris@16 85 #endif // BOOST_ASIO_DETAIL_WAIT_HANDLER_HPP