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82 lines
2.4 KiB
82 lines
2.4 KiB
// |
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// detail/completion_handler.hpp |
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// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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// |
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// Copyright (c) 2003-2011 Christopher M. Kohlhoff (chris at kohlhoff dot com) |
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// |
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// Distributed under the Boost Software License, Version 1.0. (See accompanying |
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
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// |
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#ifndef BOOST_ASIO_DETAIL_COMPLETION_HANDLER_HPP |
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#define BOOST_ASIO_DETAIL_COMPLETION_HANDLER_HPP |
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#if defined(_MSC_VER) && (_MSC_VER >= 1200) |
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# pragma once |
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#endif // defined(_MSC_VER) && (_MSC_VER >= 1200) |
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#include <boost/asio/detail/config.hpp> |
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#include <boost/asio/detail/fenced_block.hpp> |
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#include <boost/asio/detail/handler_alloc_helpers.hpp> |
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#include <boost/asio/detail/handler_invoke_helpers.hpp> |
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#include <boost/asio/detail/operation.hpp> |
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#include <boost/asio/detail/push_options.hpp> |
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namespace boost { |
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namespace asio { |
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namespace detail { |
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template <typename Handler> |
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class completion_handler : public operation |
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{ |
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public: |
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BOOST_ASIO_DEFINE_HANDLER_PTR(completion_handler); |
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completion_handler(Handler& h) |
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: operation(&completion_handler::do_complete), |
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handler_(BOOST_ASIO_MOVE_CAST(Handler)(h)) |
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{ |
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} |
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static void do_complete(io_service_impl* owner, operation* base, |
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const boost::system::error_code& /*ec*/, |
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std::size_t /*bytes_transferred*/) |
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{ |
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// Take ownership of the handler object. |
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completion_handler* h(static_cast<completion_handler*>(base)); |
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ptr p = { boost::addressof(h->handler_), h, h }; |
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BOOST_ASIO_HANDLER_COMPLETION((h)); |
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// Make a copy of the handler so that the memory can be deallocated before |
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// the upcall is made. Even if we're not about to make an upcall, a |
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// sub-object of the handler may be the true owner of the memory associated |
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// with the handler. Consequently, a local copy of the handler is required |
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// to ensure that any owning sub-object remains valid until after we have |
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// deallocated the memory here. |
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Handler handler(BOOST_ASIO_MOVE_CAST(Handler)(h->handler_)); |
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p.h = boost::addressof(handler); |
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p.reset(); |
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// Make the upcall if required. |
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if (owner) |
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{ |
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fenced_block b(fenced_block::half); |
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BOOST_ASIO_HANDLER_INVOCATION_BEGIN(()); |
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boost_asio_handler_invoke_helpers::invoke(handler, handler); |
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BOOST_ASIO_HANDLER_INVOCATION_END; |
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} |
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} |
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private: |
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Handler handler_; |
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}; |
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} // namespace detail |
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} // namespace asio |
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} // namespace boost |
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#include <boost/asio/detail/pop_options.hpp> |
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#endif // BOOST_ASIO_DETAIL_COMPLETION_HANDLER_HPP
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