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Diffstat (limited to 'src/third_party/boost-1.70.0/boost/asio/detail/resolver_service_base.hpp')
-rw-r--r-- | src/third_party/boost-1.70.0/boost/asio/detail/resolver_service_base.hpp | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/src/third_party/boost-1.70.0/boost/asio/detail/resolver_service_base.hpp b/src/third_party/boost-1.70.0/boost/asio/detail/resolver_service_base.hpp new file mode 100644 index 00000000000..8e1ff5bea82 --- /dev/null +++ b/src/third_party/boost-1.70.0/boost/asio/detail/resolver_service_base.hpp @@ -0,0 +1,145 @@ +// +// detail/resolver_service_base.hpp +// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +// +// Copyright (c) 2003-2019 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_RESOLVER_SERVICE_BASE_HPP +#define BOOST_ASIO_DETAIL_RESOLVER_SERVICE_BASE_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/error.hpp> +#include <boost/asio/execution_context.hpp> +#include <boost/asio/detail/mutex.hpp> +#include <boost/asio/detail/noncopyable.hpp> +#include <boost/asio/detail/resolve_op.hpp> +#include <boost/asio/detail/socket_ops.hpp> +#include <boost/asio/detail/socket_types.hpp> +#include <boost/asio/detail/scoped_ptr.hpp> +#include <boost/asio/detail/thread.hpp> + +#if defined(BOOST_ASIO_HAS_IOCP) +# include <boost/asio/detail/win_iocp_io_context.hpp> +#else // defined(BOOST_ASIO_HAS_IOCP) +# include <boost/asio/detail/scheduler.hpp> +#endif // defined(BOOST_ASIO_HAS_IOCP) + +#include <boost/asio/detail/push_options.hpp> + +namespace boost { +namespace asio { +namespace detail { + +class resolver_service_base +{ +public: + // The implementation type of the resolver. A cancellation token is used to + // indicate to the background thread that the operation has been cancelled. + typedef socket_ops::shared_cancel_token_type implementation_type; + + // Constructor. + BOOST_ASIO_DECL resolver_service_base(execution_context& context); + + // Destructor. + BOOST_ASIO_DECL ~resolver_service_base(); + + // Destroy all user-defined handler objects owned by the service. + BOOST_ASIO_DECL void base_shutdown(); + + // Perform any fork-related housekeeping. + BOOST_ASIO_DECL void base_notify_fork( + execution_context::fork_event fork_ev); + + // Construct a new resolver implementation. + BOOST_ASIO_DECL void construct(implementation_type& impl); + + // Destroy a resolver implementation. + BOOST_ASIO_DECL void destroy(implementation_type&); + + // Move-construct a new resolver implementation. + BOOST_ASIO_DECL void move_construct(implementation_type& impl, + implementation_type& other_impl); + + // Move-assign from another resolver implementation. + BOOST_ASIO_DECL void move_assign(implementation_type& impl, + resolver_service_base& other_service, + implementation_type& other_impl); + + // Cancel pending asynchronous operations. + BOOST_ASIO_DECL void cancel(implementation_type& impl); + +protected: + // Helper function to start an asynchronous resolve operation. + BOOST_ASIO_DECL void start_resolve_op(resolve_op* op); + +#if !defined(BOOST_ASIO_WINDOWS_RUNTIME) + // Helper class to perform exception-safe cleanup of addrinfo objects. + class auto_addrinfo + : private boost::asio::detail::noncopyable + { + public: + explicit auto_addrinfo(boost::asio::detail::addrinfo_type* ai) + : ai_(ai) + { + } + + ~auto_addrinfo() + { + if (ai_) + socket_ops::freeaddrinfo(ai_); + } + + operator boost::asio::detail::addrinfo_type*() + { + return ai_; + } + + private: + boost::asio::detail::addrinfo_type* ai_; + }; +#endif // !defined(BOOST_ASIO_WINDOWS_RUNTIME) + + // Helper class to run the work scheduler in a thread. + class work_scheduler_runner; + + // Start the work scheduler if it's not already running. + BOOST_ASIO_DECL void start_work_thread(); + + // The scheduler implementation used to post completions. +#if defined(BOOST_ASIO_HAS_IOCP) + typedef class win_iocp_io_context scheduler_impl; +#else + typedef class scheduler scheduler_impl; +#endif + scheduler_impl& scheduler_; + +private: + // Mutex to protect access to internal data. + boost::asio::detail::mutex mutex_; + + // Private scheduler used for performing asynchronous host resolution. + boost::asio::detail::scoped_ptr<scheduler_impl> work_scheduler_; + + // Thread used for running the work io_context's run loop. + boost::asio::detail::scoped_ptr<boost::asio::detail::thread> work_thread_; +}; + +} // namespace detail +} // namespace asio +} // namespace boost + +#include <boost/asio/detail/pop_options.hpp> + +#if defined(BOOST_ASIO_HEADER_ONLY) +# include <boost/asio/detail/impl/resolver_service_base.ipp> +#endif // defined(BOOST_ASIO_HEADER_ONLY) + +#endif // BOOST_ASIO_DETAIL_RESOLVER_SERVICE_BASE_HPP |