ceph/src/boost/libs/asio/include/boost/asio/detail/resolver_service_base.hpp

   1 //
   2 // detail/resolver_service_base.hpp
   3 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2016 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_RESOLVER_SERVICE_BASE_HPP
  12 #define BOOST_ASIO_DETAIL_RESOLVER_SERVICE_BASE_HPP
  13
  14 #if defined(_MSC_VER) && (_MSC_VER >= 1200)
  15 # pragma once
  16 #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
  17
  18 #include <boost/asio/detail/config.hpp>
  19 #include <boost/asio/error.hpp>
  20 #include <boost/asio/io_service.hpp>
  21 #include <boost/asio/detail/mutex.hpp>
  22 #include <boost/asio/detail/noncopyable.hpp>
  23 #include <boost/asio/detail/operation.hpp>
  24 #include <boost/asio/detail/socket_ops.hpp>
  25 #include <boost/asio/detail/socket_types.hpp>
  26 #include <boost/asio/detail/scoped_ptr.hpp>
  27 #include <boost/asio/detail/thread.hpp>
  28
  29 #include <boost/asio/detail/push_options.hpp>
  30
  31 namespace boost {
  32 namespace asio {
  33 namespace detail {
  34
  35 class resolver_service_base
  36 {
  37 public:
  38   // The implementation type of the resolver. A cancellation token is used to
  39   // indicate to the background thread that the operation has been cancelled.
  40   typedef socket_ops::shared_cancel_token_type implementation_type;
  41
  42   // Constructor.
  43   BOOST_ASIO_DECL resolver_service_base(boost::asio::io_service& io_service);
  44
  45   // Destructor.
  46   BOOST_ASIO_DECL ~resolver_service_base();
  47
  48   // Destroy all user-defined handler objects owned by the service.
  49   BOOST_ASIO_DECL void shutdown_service();
  50
  51   // Perform any fork-related housekeeping.
  52   BOOST_ASIO_DECL void fork_service(
  53       boost::asio::io_service::fork_event fork_ev);
  54
  55   // Construct a new resolver implementation.
  56   BOOST_ASIO_DECL void construct(implementation_type& impl);
  57
  58   // Destroy a resolver implementation.
  59   BOOST_ASIO_DECL void destroy(implementation_type&);
  60
  61   // Cancel pending asynchronous operations.
  62   BOOST_ASIO_DECL void cancel(implementation_type& impl);
  63
  64 protected:
  65   // Helper function to start an asynchronous resolve operation.
  66   BOOST_ASIO_DECL void start_resolve_op(operation* op);
  67
  68 #if !defined(BOOST_ASIO_WINDOWS_RUNTIME)
  69   // Helper class to perform exception-safe cleanup of addrinfo objects.
  70   class auto_addrinfo
  71     : private boost::asio::detail::noncopyable
  72   {
  73   public:
  74     explicit auto_addrinfo(boost::asio::detail::addrinfo_type* ai)
  75       : ai_(ai)
  76     {
  77     }
  78
  79     ~auto_addrinfo()
  80     {
  81       if (ai_)
  82         socket_ops::freeaddrinfo(ai_);
  83     }
  84
  85     operator boost::asio::detail::addrinfo_type*()
  86     {
  87       return ai_;
  88     }
  89
  90   private:
  91     boost::asio::detail::addrinfo_type* ai_;
  92   };
  93 #endif // !defined(BOOST_ASIO_WINDOWS_RUNTIME)
  94
  95   // Helper class to run the work io_service in a thread.
  96   class work_io_service_runner;
  97
  98   // Start the work thread if it's not already running.
  99   BOOST_ASIO_DECL void start_work_thread();
 100
 101   // The io_service implementation used to post completions.
 102   io_service_impl& io_service_impl_;
 103
 104 private:
 105   // Mutex to protect access to internal data.
 106   boost::asio::detail::mutex mutex_;
 107
 108   // Private io_service used for performing asynchronous host resolution.
 109   boost::asio::detail::scoped_ptr<boost::asio::io_service> work_io_service_;
 110
 111   // The work io_service implementation used to post completions.
 112   io_service_impl& work_io_service_impl_;
 113
 114   // Work for the private io_service to perform.
 115   boost::asio::detail::scoped_ptr<boost::asio::io_service::work> work_;
 116
 117   // Thread used for running the work io_service's run loop.
 118   boost::asio::detail::scoped_ptr<boost::asio::detail::thread> work_thread_;
 119 };
 120
 121 } // namespace detail
 122 } // namespace asio
 123 } // namespace boost
 124
 125 #include <boost/asio/detail/pop_options.hpp>
 126
 127 #if defined(BOOST_ASIO_HEADER_ONLY)
 128 # include <boost/asio/detail/impl/resolver_service_base.ipp>
 129 #endif // defined(BOOST_ASIO_HEADER_ONLY)
 130
 131 #endif // BOOST_ASIO_DETAIL_RESOLVER_SERVICE_BASE_HPP