1 // 2 // detail/thread_context.hpp 3 // ~~~~~~~~~~~~~~~~~~~~~~~~~ 4 // 5 // Copyright (c) 2003-2021 Christopher M. Kohlhoff (chris at kohlhoff dot com) 6 // 7 // Distributed under the Boost Software License, Version 1.0. (See accompanying 8 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) 9 // 10 11 #ifndef BOOST_ASIO_DETAIL_THREAD_CONTEXT_HPP 12 #define BOOST_ASIO_DETAIL_THREAD_CONTEXT_HPP 13 14 #if defined(_MSC_VER) && (_MSC_VER >= 1200) 15 # pragma once 16 #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) 17 18 #include <climits> 19 #include <cstddef> 20 #include <boost/asio/detail/call_stack.hpp> 21 22 #include <boost/asio/detail/push_options.hpp> 23 24 namespace boost { 25 namespace asio { 26 namespace detail { 27 28 class thread_info_base; 29 30 // Base class for things that manage threads (scheduler, win_iocp_io_context). 31 class thread_context 32 { 33 public: 34 // Obtain a pointer to the top of the thread call stack. Returns null when 35 // not running inside a thread context. 36 BOOST_ASIO_DECL static thread_info_base* top_of_thread_call_stack(); 37 38 protected: 39 // Per-thread call stack to track the state of each thread in the context. 40 typedef call_stack<thread_context, thread_info_base> thread_call_stack; 41 }; 42 43 } // namespace detail 44 } // namespace asio 45 } // namespace boost 46 47 #include <boost/asio/detail/pop_options.hpp> 48 49 #if defined(BOOST_ASIO_HEADER_ONLY) 50 # include <boost/asio/detail/impl/thread_context.ipp> 51 #endif // defined(BOOST_ASIO_HEADER_ONLY) 52 53 #endif // BOOST_ASIO_DETAIL_THREAD_CONTEXT_HPP 54