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- //
- // detail/impl/strand_service.hpp
- // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- //
- // Copyright (c) 2003-2021 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_IMPL_STRAND_SERVICE_HPP
- #define BOOST_ASIO_DETAIL_IMPL_STRAND_SERVICE_HPP
- #if defined(_MSC_VER) && (_MSC_VER >= 1200)
- # pragma once
- #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
- #include <boost/asio/detail/completion_handler.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/push_options.hpp>
- namespace boost {
- namespace asio {
- namespace detail {
- inline strand_service::strand_impl::strand_impl()
- : operation(&strand_service::do_complete),
- locked_(false)
- {
- }
- template <typename Handler>
- void strand_service::dispatch(strand_service::implementation_type& impl,
- Handler& handler)
- {
- // If we are already in the strand then the handler can run immediately.
- if (running_in_this_thread(impl))
- {
- fenced_block b(fenced_block::full);
- boost_asio_handler_invoke_helpers::invoke(handler, handler);
- return;
- }
- // Allocate and construct an operation to wrap the handler.
- typedef completion_handler<Handler, io_context::executor_type> op;
- typename op::ptr p = { boost::asio::detail::addressof(handler),
- op::ptr::allocate(handler), 0 };
- p.p = new (p.v) op(handler, io_context_.get_executor());
- BOOST_ASIO_HANDLER_CREATION((this->context(),
- *p.p, "strand", impl, 0, "dispatch"));
- operation* o = p.p;
- p.v = p.p = 0;
- do_dispatch(impl, o);
- }
- // Request the io_context to invoke the given handler and return immediately.
- template <typename Handler>
- void strand_service::post(strand_service::implementation_type& impl,
- Handler& handler)
- {
- bool is_continuation =
- boost_asio_handler_cont_helpers::is_continuation(handler);
- // Allocate and construct an operation to wrap the handler.
- typedef completion_handler<Handler, io_context::executor_type> op;
- typename op::ptr p = { boost::asio::detail::addressof(handler),
- op::ptr::allocate(handler), 0 };
- p.p = new (p.v) op(handler, io_context_.get_executor());
- BOOST_ASIO_HANDLER_CREATION((this->context(),
- *p.p, "strand", impl, 0, "post"));
- do_post(impl, p.p, is_continuation);
- p.v = p.p = 0;
- }
- } // namespace detail
- } // namespace asio
- } // namespace boost
- #include <boost/asio/detail/pop_options.hpp>
- #endif // BOOST_ASIO_DETAIL_IMPL_STRAND_SERVICE_HPP
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