58de70e3c1
git-svn-id: http://libopenmetaverse.googlecode.com/svn/trunk@18 52acb1d6-8a22-11de-b505-999d5b087335
93 lines
2.3 KiB
C++
93 lines
2.3 KiB
C++
//
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// demuxer_run_call_stack.hpp
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// ~~~~~~~~~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2005 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_DEMUXER_RUN_CALL_STACK_HPP
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#define BOOST_ASIO_DETAIL_DEMUXER_RUN_CALL_STACK_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/push_options.hpp>
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#include <boost/asio/detail/noncopyable.hpp>
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#include <boost/asio/detail/tss_ptr.hpp>
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namespace boost {
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namespace asio {
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namespace detail {
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// Helper class to determine whether or not the current thread is inside an
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// invocation of demuxer::run() for a specified demuxer.
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template <typename Demuxer_Service>
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class demuxer_run_call_stack
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{
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public:
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// Context class automatically pushes a demuxer on to the stack.
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class context
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: private noncopyable
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{
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public:
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// Push the demuxer on to the stack.
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explicit context(Demuxer_Service* d)
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: demuxer_service_(d),
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next_(demuxer_run_call_stack<Demuxer_Service>::top_)
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{
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demuxer_run_call_stack<Demuxer_Service>::top_ = this;
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}
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// Pop the demuxer from the stack.
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~context()
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{
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demuxer_run_call_stack<Demuxer_Service>::top_ = next_;
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}
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private:
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friend class demuxer_run_call_stack<Demuxer_Service>;
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// The demuxer service associated with the context.
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Demuxer_Service* demuxer_service_;
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// The next element in the stack.
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context* next_;
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};
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friend class context;
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// Determine whether the specified demuxer is on the stack.
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static bool contains(Demuxer_Service* d)
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{
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context* elem = top_;
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while (elem)
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{
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if (elem->demuxer_service_ == d)
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return true;
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elem = elem->next_;
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}
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return false;
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}
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private:
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// The top of the stack of demuxer::run() calls for the current thread.
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static tss_ptr<context> top_;
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};
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template <typename Demuxer_Service>
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tss_ptr<typename demuxer_run_call_stack<Demuxer_Service>::context>
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demuxer_run_call_stack<Demuxer_Service>::top_;
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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_DEMUXER_RUN_CALL_STACK_HPP
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