asio/detail/thread_context.hpp

0001 //
0002 // detail/thread_context.hpp
0003 // ~~~~~~~~~~~~~~~~~~~~~~~~~
0004 //
0005 // Copyright (c) 2003-2023 Christopher M. Kohlhoff (chris at kohlhoff dot com)
0006 //
0007 // Distributed under the Boost Software License, Version 1.0. (See accompanying
0008 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
0009 //
0010
0011 #ifndef BOOST_ASIO_DETAIL_THREAD_CONTEXT_HPP
0012 #define BOOST_ASIO_DETAIL_THREAD_CONTEXT_HPP
0013
0014 #if defined(_MSC_VER) && (_MSC_VER >= 1200)
0015 # pragma once
0016 #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
0017
0018 #include <climits>
0019 #include <cstddef>
0020 #include <boost/asio/detail/call_stack.hpp>
0021
0022 #include <boost/asio/detail/push_options.hpp>
0023
0024 namespace boost {
0025 namespace asio {
0026 namespace detail {
0027
0028 class thread_info_base;
0029
0030 // Base class for things that manage threads (scheduler, win_iocp_io_context).
0031 class thread_context
0032 {
0033 public:
0034   // Obtain a pointer to the top of the thread call stack. Returns null when
0035   // not running inside a thread context.
0036   BOOST_ASIO_DECL static thread_info_base* top_of_thread_call_stack();
0037
0038 protected:
0039   // Per-thread call stack to track the state of each thread in the context.
0040   typedef call_stack<thread_context, thread_info_base> thread_call_stack;
0041 };
0042
0043 } // namespace detail
0044 } // namespace asio
0045 } // namespace boost
0046
0047 #include <boost/asio/detail/pop_options.hpp>
0048
0049 #if defined(BOOST_ASIO_HEADER_ONLY)
0050 # include <boost/asio/detail/impl/thread_context.ipp>
0051 #endif // defined(BOOST_ASIO_HEADER_ONLY)
0052
0053 #endif // BOOST_ASIO_DETAIL_THREAD_CONTEXT_HPP