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

   1 //
   2 // detail/kqueue_reactor.hpp
   3 // ~~~~~~~~~~~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2016 Christopher M. Kohlhoff (chris at kohlhoff dot com)
   6 // Copyright (c) 2005 Stefan Arentz (stefan at soze dot com)
   7 //
   8 // Distributed under the Boost Software License, Version 1.0. (See accompanying
   9 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
  10 //
  11
  12 #ifndef BOOST_ASIO_DETAIL_KQUEUE_REACTOR_HPP
  13 #define BOOST_ASIO_DETAIL_KQUEUE_REACTOR_HPP
  14
  15 #if defined(_MSC_VER) && (_MSC_VER >= 1200)
  16 # pragma once
  17 #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
  18
  19 #include <boost/asio/detail/config.hpp>
  20
  21 #if defined(BOOST_ASIO_HAS_KQUEUE)
  22
  23 #include <cstddef>
  24 #include <sys/types.h>
  25 #include <sys/event.h>
  26 #include <sys/time.h>
  27 #include <boost/asio/detail/limits.hpp>
  28 #include <boost/asio/detail/mutex.hpp>
  29 #include <boost/asio/detail/object_pool.hpp>
  30 #include <boost/asio/detail/op_queue.hpp>
  31 #include <boost/asio/detail/reactor_op.hpp>
  32 #include <boost/asio/detail/select_interrupter.hpp>
  33 #include <boost/asio/detail/socket_types.hpp>
  34 #include <boost/asio/detail/timer_queue_base.hpp>
  35 #include <boost/asio/detail/timer_queue_set.hpp>
  36 #include <boost/asio/detail/wait_op.hpp>
  37 #include <boost/asio/error.hpp>
  38 #include <boost/asio/io_service.hpp>
  39
  40 // Older versions of Mac OS X may not define EV_OOBAND.
  41 #if !defined(EV_OOBAND)
  42 # define EV_OOBAND EV_FLAG1
  43 #endif // !defined(EV_OOBAND)
  44
  45 #include <boost/asio/detail/push_options.hpp>
  46
  47 namespace boost {
  48 namespace asio {
  49 namespace detail {
  50
  51 class kqueue_reactor
  52   : public boost::asio::detail::service_base<kqueue_reactor>
  53 {
  54 public:
  55   enum op_types { read_op = 0, write_op = 1,
  56     connect_op = 1, except_op = 2, max_ops = 3 };
  57
  58   // Per-descriptor queues.
  59   struct descriptor_state
  60   {
  61     friend class kqueue_reactor;
  62     friend class object_pool_access;
  63
  64     descriptor_state* next_;
  65     descriptor_state* prev_;
  66
  67     mutex mutex_;
  68     int descriptor_;
  69     int num_kevents_; // 1 == read only, 2 == read and write
  70     op_queue<reactor_op> op_queue_[max_ops];
  71     bool shutdown_;
  72   };
  73
  74   // Per-descriptor data.
  75   typedef descriptor_state* per_descriptor_data;
  76
  77   // Constructor.
  78   BOOST_ASIO_DECL kqueue_reactor(boost::asio::io_service& io_service);
  79
  80   // Destructor.
  81   BOOST_ASIO_DECL ~kqueue_reactor();
  82
  83   // Destroy all user-defined handler objects owned by the service.
  84   BOOST_ASIO_DECL void shutdown_service();
  85
  86   // Recreate internal descriptors following a fork.
  87   BOOST_ASIO_DECL void fork_service(
  88       boost::asio::io_service::fork_event fork_ev);
  89
  90   // Initialise the task.
  91   BOOST_ASIO_DECL void init_task();
  92
  93   // Register a socket with the reactor. Returns 0 on success, system error
  94   // code on failure.
  95   BOOST_ASIO_DECL int register_descriptor(socket_type descriptor,
  96       per_descriptor_data& descriptor_data);
  97
  98   // Register a descriptor with an associated single operation. Returns 0 on
  99   // success, system error code on failure.
 100   BOOST_ASIO_DECL int register_internal_descriptor(
 101       int op_type, socket_type descriptor,
 102       per_descriptor_data& descriptor_data, reactor_op* op);
 103
 104   // Move descriptor registration from one descriptor_data object to another.
 105   BOOST_ASIO_DECL void move_descriptor(socket_type descriptor,
 106       per_descriptor_data& target_descriptor_data,
 107       per_descriptor_data& source_descriptor_data);
 108
 109   // Post a reactor operation for immediate completion.
 110   void post_immediate_completion(reactor_op* op, bool is_continuation)
 111   {
 112     io_service_.post_immediate_completion(op, is_continuation);
 113   }
 114
 115   // Start a new operation. The reactor operation will be performed when the
 116   // given descriptor is flagged as ready, or an error has occurred.
 117   BOOST_ASIO_DECL void start_op(int op_type, socket_type descriptor,
 118       per_descriptor_data& descriptor_data, reactor_op* op,
 119       bool is_continuation, bool allow_speculative);
 120
 121   // Cancel all operations associated with the given descriptor. The
 122   // handlers associated with the descriptor will be invoked with the
 123   // operation_aborted error.
 124   BOOST_ASIO_DECL void cancel_ops(socket_type descriptor,
 125       per_descriptor_data& descriptor_data);
 126
 127   // Cancel any operations that are running against the descriptor and remove
 128   // its registration from the reactor.
 129   BOOST_ASIO_DECL void deregister_descriptor(socket_type descriptor,
 130       per_descriptor_data& descriptor_data, bool closing);
 131
 132   // Remote the descriptor's registration from the reactor.
 133   BOOST_ASIO_DECL void deregister_internal_descriptor(
 134       socket_type descriptor, per_descriptor_data& descriptor_data);
 135
 136   // Add a new timer queue to the reactor.
 137   template <typename Time_Traits>
 138   void add_timer_queue(timer_queue<Time_Traits>& queue);
 139
 140   // Remove a timer queue from the reactor.
 141   template <typename Time_Traits>
 142   void remove_timer_queue(timer_queue<Time_Traits>& queue);
 143
 144   // Schedule a new operation in the given timer queue to expire at the
 145   // specified absolute time.
 146   template <typename Time_Traits>
 147   void schedule_timer(timer_queue<Time_Traits>& queue,
 148       const typename Time_Traits::time_type& time,
 149       typename timer_queue<Time_Traits>::per_timer_data& timer, wait_op* op);
 150
 151   // Cancel the timer operations associated with the given token. Returns the
 152   // number of operations that have been posted or dispatched.
 153   template <typename Time_Traits>
 154   std::size_t cancel_timer(timer_queue<Time_Traits>& queue,
 155       typename timer_queue<Time_Traits>::per_timer_data& timer,
 156       std::size_t max_cancelled = (std::numeric_limits<std::size_t>::max)());
 157
 158   // Run the kqueue loop.
 159   BOOST_ASIO_DECL void run(bool block, op_queue<operation>& ops);
 160
 161   // Interrupt the kqueue loop.
 162   BOOST_ASIO_DECL void interrupt();
 163
 164 private:
 165   // Create the kqueue file descriptor. Throws an exception if the descriptor
 166   // cannot be created.
 167   BOOST_ASIO_DECL static int do_kqueue_create();
 168
 169   // Allocate a new descriptor state object.
 170   BOOST_ASIO_DECL descriptor_state* allocate_descriptor_state();
 171
 172   // Free an existing descriptor state object.
 173   BOOST_ASIO_DECL void free_descriptor_state(descriptor_state* s);
 174
 175   // Helper function to add a new timer queue.
 176   BOOST_ASIO_DECL void do_add_timer_queue(timer_queue_base& queue);
 177
 178   // Helper function to remove a timer queue.
 179   BOOST_ASIO_DECL void do_remove_timer_queue(timer_queue_base& queue);
 180
 181   // Get the timeout value for the kevent call.
 182   BOOST_ASIO_DECL timespec* get_timeout(timespec& ts);
 183
 184   // The io_service implementation used to post completions.
 185   io_service_impl& io_service_;
 186
 187   // Mutex to protect access to internal data.
 188   mutex mutex_;
 189
 190   // The kqueue file descriptor.
 191   int kqueue_fd_;
 192
 193   // The interrupter is used to break a blocking kevent call.
 194   select_interrupter interrupter_;
 195
 196   // The timer queues.
 197   timer_queue_set timer_queues_;
 198
 199   // Whether the service has been shut down.
 200   bool shutdown_;
 201
 202   // Mutex to protect access to the registered descriptors.
 203   mutex registered_descriptors_mutex_;
 204
 205   // Keep track of all registered descriptors.
 206   object_pool<descriptor_state> registered_descriptors_;
 207 };
 208
 209 } // namespace detail
 210 } // namespace asio
 211 } // namespace boost
 212
 213 #include <boost/asio/detail/pop_options.hpp>
 214
 215 #include <boost/asio/detail/impl/kqueue_reactor.hpp>
 216 #if defined(BOOST_ASIO_HEADER_ONLY)
 217 # include <boost/asio/detail/impl/kqueue_reactor.ipp>
 218 #endif // defined(BOOST_ASIO_HEADER_ONLY)
 219
 220 #endif // defined(BOOST_ASIO_HAS_KQUEUE)
 221
 222 #endif // BOOST_ASIO_DETAIL_KQUEUE_REACTOR_HPP