/Src/Dependencies/Boost/boost/asio/detail/impl/strand_service.hpp
http://hadesmem.googlecode.com/ · C++ Header · 120 lines · 82 code · 23 blank · 15 comment · 4 complexity · c5e6cc82b5f45dd2dddf9d63cacf00a1 MD5 · raw file
- //
- // detail/impl/strand_service.hpp
- // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- //
- // Copyright (c) 2003-2011 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/call_stack.hpp>
- #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/push_options.hpp>
- namespace boost {
- namespace asio {
- namespace detail {
- inline strand_service::strand_impl::strand_impl()
- : operation(&strand_service::do_complete),
- count_(0)
- {
- }
- struct strand_service::on_dispatch_exit
- {
- io_service_impl* io_service_;
- strand_impl* impl_;
- ~on_dispatch_exit()
- {
- impl_->mutex_.lock();
- bool more_handlers = (--impl_->count_ > 0);
- impl_->mutex_.unlock();
- if (more_handlers)
- io_service_->post_immediate_completion(impl_);
- }
- };
- inline void strand_service::destroy(strand_service::implementation_type& impl)
- {
- impl = 0;
- }
- 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 (call_stack<strand_impl>::contains(impl))
- {
- boost::asio::detail::fenced_block b;
- boost_asio_handler_invoke_helpers::invoke(handler, handler);
- return;
- }
- // Allocate and construct an operation to wrap the handler.
- typedef completion_handler<Handler> op;
- typename op::ptr p = { boost::addressof(handler),
- boost_asio_handler_alloc_helpers::allocate(
- sizeof(op), handler), 0 };
- p.p = new (p.v) op(handler);
- BOOST_ASIO_HANDLER_CREATION((p.p, "strand", impl, "dispatch"));
- bool dispatch_immediately = do_dispatch(impl, p.p);
- operation* o = p.p;
- p.v = p.p = 0;
- if (dispatch_immediately)
- {
- // Indicate that this strand is executing on the current thread.
- call_stack<strand_impl>::context ctx(impl);
- // Ensure the next handler, if any, is scheduled on block exit.
- on_dispatch_exit on_exit = { &io_service_, impl };
- (void)on_exit;
- completion_handler<Handler>::do_complete(
- &io_service_, o, boost::system::error_code(), 0);
- }
- }
- // Request the io_service to invoke the given handler and return immediately.
- template <typename Handler>
- void strand_service::post(strand_service::implementation_type& impl,
- Handler handler)
- {
- // Allocate and construct an operation to wrap the handler.
- typedef completion_handler<Handler> op;
- typename op::ptr p = { boost::addressof(handler),
- boost_asio_handler_alloc_helpers::allocate(
- sizeof(op), handler), 0 };
- p.p = new (p.v) op(handler);
- BOOST_ASIO_HANDLER_CREATION((p.p, "strand", impl, "post"));
- do_post(impl, p.p);
- 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