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Diffstat (limited to 'src/third_party/boost-1.69.0/boost/asio/detail/executor_op.hpp')
-rw-r--r-- | src/third_party/boost-1.69.0/boost/asio/detail/executor_op.hpp | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/src/third_party/boost-1.69.0/boost/asio/detail/executor_op.hpp b/src/third_party/boost-1.69.0/boost/asio/detail/executor_op.hpp new file mode 100644 index 00000000000..1c8671abc85 --- /dev/null +++ b/src/third_party/boost-1.69.0/boost/asio/detail/executor_op.hpp @@ -0,0 +1,86 @@ +// +// detail/executor_op.hpp +// ~~~~~~~~~~~~~~~~~~~~~~ +// +// Copyright (c) 2003-2018 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_EXECUTOR_OP_HPP +#define BOOST_ASIO_DETAIL_EXECUTOR_OP_HPP + +#if defined(_MSC_VER) && (_MSC_VER >= 1200) +# pragma once +#endif // defined(_MSC_VER) && (_MSC_VER >= 1200) + +#include <boost/asio/detail/config.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/scheduler_operation.hpp> + +#include <boost/asio/detail/push_options.hpp> + +namespace boost { +namespace asio { +namespace detail { + +template <typename Handler, typename Alloc, + typename Operation = scheduler_operation> +class executor_op : public Operation +{ +public: + BOOST_ASIO_DEFINE_HANDLER_ALLOCATOR_PTR(executor_op); + + template <typename H> + executor_op(BOOST_ASIO_MOVE_ARG(H) h, const Alloc& allocator) + : Operation(&executor_op::do_complete), + handler_(BOOST_ASIO_MOVE_CAST(H)(h)), + allocator_(allocator) + { + } + + static void do_complete(void* owner, Operation* base, + const boost::system::error_code& /*ec*/, + std::size_t /*bytes_transferred*/) + { + // Take ownership of the handler object. + executor_op* o(static_cast<executor_op*>(base)); + Alloc allocator(o->allocator_); + ptr p = { detail::addressof(allocator), o, o }; + + BOOST_ASIO_HANDLER_COMPLETION((*o)); + + // Make a copy of the handler so that the memory can be deallocated before + // the upcall is made. Even if we're not about to make an upcall, a + // sub-object of the handler may be the true owner of the memory associated + // with the handler. Consequently, a local copy of the handler is required + // to ensure that any owning sub-object remains valid until after we have + // deallocated the memory here. + Handler handler(BOOST_ASIO_MOVE_CAST(Handler)(o->handler_)); + p.reset(); + + // Make the upcall if required. + if (owner) + { + fenced_block b(fenced_block::half); + BOOST_ASIO_HANDLER_INVOCATION_BEGIN(()); + boost_asio_handler_invoke_helpers::invoke(handler, handler); + BOOST_ASIO_HANDLER_INVOCATION_END; + } + } + +private: + Handler handler_; + Alloc allocator_; +}; + +} // namespace detail +} // namespace asio +} // namespace boost + +#include <boost/asio/detail/pop_options.hpp> + +#endif // BOOST_ASIO_DETAIL_EXECUTOR_OP_HPP |