| // |
| // detail/call_stack.hpp |
| // ~~~~~~~~~~~~~~~~~~~~~ |
| // |
| // Copyright (c) 2003-2010 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_CALL_STACK_HPP |
| #define BOOST_ASIO_DETAIL_CALL_STACK_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/noncopyable.hpp> |
| #include <boost/asio/detail/tss_ptr.hpp> |
| |
| #include <boost/asio/detail/push_options.hpp> |
| |
| namespace boost { |
| namespace asio { |
| namespace detail { |
| |
| // Helper class to determine whether or not the current thread is inside an |
| // invocation of io_service::run() for a specified io_service object. |
| template <typename Owner> |
| class call_stack |
| { |
| public: |
| // Context class automatically pushes an owner on to the stack. |
| class context |
| : private noncopyable |
| { |
| public: |
| // Push the owner on to the stack. |
| explicit context(Owner* d) |
| : owner_(d), |
| next_(call_stack<Owner>::top_) |
| { |
| call_stack<Owner>::top_ = this; |
| } |
| |
| // Pop the owner from the stack. |
| ~context() |
| { |
| call_stack<Owner>::top_ = next_; |
| } |
| |
| private: |
| friend class call_stack<Owner>; |
| |
| // The owner associated with the context. |
| Owner* owner_; |
| |
| // The next element in the stack. |
| context* next_; |
| }; |
| |
| friend class context; |
| |
| // Determine whether the specified owner is on the stack. |
| static bool contains(Owner* d) |
| { |
| context* elem = top_; |
| while (elem) |
| { |
| if (elem->owner_ == d) |
| return true; |
| elem = elem->next_; |
| } |
| return false; |
| } |
| |
| private: |
| // The top of the stack of calls for the current thread. |
| static tss_ptr<context> top_; |
| }; |
| |
| template <typename Owner> |
| tss_ptr<typename call_stack<Owner>::context> |
| call_stack<Owner>::top_; |
| |
| } // namespace detail |
| } // namespace asio |
| } // namespace boost |
| |
| #include <boost/asio/detail/pop_options.hpp> |
| |
| #endif // BOOST_ASIO_DETAIL_CALL_STACK_HPP |