91 lines
1.9 KiB
C++
91 lines
1.9 KiB
C++
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//
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// call_stack.hpp
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// ~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2008 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 ASIO_DETAIL_CALL_STACK_HPP
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#define ASIO_DETAIL_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 "asio/detail/push_options.hpp"
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#include "asio/detail/noncopyable.hpp"
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#include "asio/detail/tss_ptr.hpp"
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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 io_service::run() for a specified io_service object.
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template <typename Owner>
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class call_stack
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{
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public:
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// Context class automatically pushes an owner 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 owner on to the stack.
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explicit context(Owner* d)
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: owner_(d),
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next_(call_stack<Owner>::top_)
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{
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call_stack<Owner>::top_ = this;
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}
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// Pop the owner from the stack.
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~context()
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{
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call_stack<Owner>::top_ = next_;
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}
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private:
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friend class call_stack<Owner>;
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// The owner associated with the context.
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Owner* owner_;
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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 owner is on the stack.
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static bool contains(Owner* 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->owner_ == 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 calls for the current thread.
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static tss_ptr<context> top_;
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};
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template <typename Owner>
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tss_ptr<typename call_stack<Owner>::context>
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call_stack<Owner>::top_;
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} // namespace detail
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} // namespace asio
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#include "asio/detail/pop_options.hpp"
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#endif // ASIO_DETAIL_CALL_STACK_HPP
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