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 //
 // detail/dev_poll_reactor.hpp
 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~
 //
 // Copyright (c) 2003-2023 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_DEV_POLL_REACTOR_HPP
 #define BOOST_ASIO_DETAIL_DEV_POLL_REACTOR_HPP
 
 #if defined(_MSC_VER) && (_MSC_VER >= 1200)
 # pragma once
 #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
 
 #include <boost/asio/detail/config.hpp>
 
 #if defined(BOOST_ASIO_HAS_DEV_POLL)
 
 #include <cstddef>
 #include <vector>
 #include <sys/devpoll.h>
 #include <boost/asio/detail/hash_map.hpp>
 #include <boost/asio/detail/limits.hpp>
 #include <boost/asio/detail/mutex.hpp>
 #include <boost/asio/detail/op_queue.hpp>
 #include <boost/asio/detail/reactor_op.hpp>
 #include <boost/asio/detail/reactor_op_queue.hpp>
 #include <boost/asio/detail/scheduler_task.hpp>
 #include <boost/asio/detail/select_interrupter.hpp>
 #include <boost/asio/detail/socket_types.hpp>
 #include <boost/asio/detail/timer_queue_base.hpp>
 #include <boost/asio/detail/timer_queue_set.hpp>
 #include <boost/asio/detail/wait_op.hpp>
 #include <boost/asio/execution_context.hpp>
 
 #include <boost/asio/detail/push_options.hpp>
 
 namespace boost {
 namespace asio {
 namespace detail {
 
 class dev_poll_reactor
   : public execution_context_service_base<dev_poll_reactor>,
     public scheduler_task
 {
 public:
   enum op_types { read_op = 0, write_op = 1,
     connect_op = 1, except_op = 2, max_ops = 3 };
 
   // Per-descriptor data.
   struct per_descriptor_data
   {
   };
 
   // Constructor.
   BOOST_ASIO_DECL dev_poll_reactor(boost::asio::execution_context& ctx);
 
   // Destructor.
   BOOST_ASIO_DECL ~dev_poll_reactor();
 
   // Destroy all user-defined handler objects owned by the service.
   BOOST_ASIO_DECL void shutdown();
 
   // Recreate internal descriptors following a fork.
   BOOST_ASIO_DECL void notify_fork(
       boost::asio::execution_context::fork_event fork_ev);
 
   // Initialise the task.
   BOOST_ASIO_DECL void init_task();
 
   // Register a socket with the reactor. Returns 0 on success, system error
   // code on failure.
   BOOST_ASIO_DECL int register_descriptor(socket_type, per_descriptor_data&);
 
   // Register a descriptor with an associated single operation. Returns 0 on
   // success, system error code on failure.
   BOOST_ASIO_DECL int register_internal_descriptor(
       int op_type, socket_type descriptor,
       per_descriptor_data& descriptor_data, reactor_op* op);
 
   // Move descriptor registration from one descriptor_data object to another.
   BOOST_ASIO_DECL void move_descriptor(socket_type descriptor,
       per_descriptor_data& target_descriptor_data,
       per_descriptor_data& source_descriptor_data);
 
   // Post a reactor operation for immediate completion.
   void post_immediate_completion(operation* op, bool is_continuation) const;
 
   // Post a reactor operation for immediate completion.
   BOOST_ASIO_DECL static void call_post_immediate_completion(
       operation* op, bool is_continuation, const void* self);
 
   // Start a new operation. The reactor operation will be performed when the
   // given descriptor is flagged as ready, or an error has occurred.
   BOOST_ASIO_DECL void start_op(int op_type, socket_type descriptor,
       per_descriptor_data&, reactor_op* op,
       bool is_continuation, bool allow_speculative,
       void (*on_immediate)(operation*, bool, const void*),
       const void* immediate_arg);
 
   // Start a new operation. The reactor operation will be performed when the
   // given descriptor is flagged as ready, or an error has occurred.
   void start_op(int op_type, socket_type descriptor,
       per_descriptor_data& descriptor_data, reactor_op* op,
       bool is_continuation, bool allow_speculative)
   {
     start_op(op_type, descriptor, descriptor_data,
         op, is_continuation, allow_speculative,
         &dev_poll_reactor::call_post_immediate_completion, this);
   }
 
   // Cancel all operations associated with the given descriptor. The
   // handlers associated with the descriptor will be invoked with the
   // operation_aborted error.
   BOOST_ASIO_DECL void cancel_ops(socket_type descriptor, per_descriptor_data&);
 
   // Cancel all operations associated with the given descriptor and key. The
   // handlers associated with the descriptor will be invoked with the
   // operation_aborted error.
   BOOST_ASIO_DECL void cancel_ops_by_key(socket_type descriptor,
       per_descriptor_data& descriptor_data,
       int op_type, void* cancellation_key);
 
   // Cancel any operations that are running against the descriptor and remove
   // its registration from the reactor. The reactor resources associated with
   // the descriptor must be released by calling cleanup_descriptor_data.
   BOOST_ASIO_DECL void deregister_descriptor(socket_type descriptor,
       per_descriptor_data&, bool closing);
 
   // Remove the descriptor's registration from the reactor. The reactor
   // resources associated with the descriptor must be released by calling
   // cleanup_descriptor_data.
   BOOST_ASIO_DECL void deregister_internal_descriptor(
       socket_type descriptor, per_descriptor_data&);
 
   // Perform any post-deregistration cleanup tasks associated with the
   // descriptor data.
   BOOST_ASIO_DECL void cleanup_descriptor_data(per_descriptor_data&);
 
   // Add a new timer queue to the reactor.
   template <typename Time_Traits>
   void add_timer_queue(timer_queue<Time_Traits>& queue);
 
   // Remove a timer queue from the reactor.
   template <typename Time_Traits>
   void remove_timer_queue(timer_queue<Time_Traits>& queue);
 
   // Schedule a new operation in the given timer queue to expire at the
   // specified absolute time.
   template <typename Time_Traits>
   void schedule_timer(timer_queue<Time_Traits>& queue,
       const typename Time_Traits::time_type& time,
       typename timer_queue<Time_Traits>::per_timer_data& timer, wait_op* op);
 
   // Cancel the timer operations associated with the given token. Returns the
   // number of operations that have been posted or dispatched.
   template <typename Time_Traits>
   std::size_t cancel_timer(timer_queue<Time_Traits>& queue,
       typename timer_queue<Time_Traits>::per_timer_data& timer,
       std::size_t max_cancelled = (std::numeric_limits<std::size_t>::max)());
 
   // Cancel the timer operations associated with the given key.
   template <typename Time_Traits>
   void cancel_timer_by_key(timer_queue<Time_Traits>& queue,
       typename timer_queue<Time_Traits>::per_timer_data* timer,
       void* cancellation_key);
 
   // Move the timer operations associated with the given timer.
   template <typename Time_Traits>
   void move_timer(timer_queue<Time_Traits>& queue,
       typename timer_queue<Time_Traits>::per_timer_data& target,
       typename timer_queue<Time_Traits>::per_timer_data& source);
 
   // Run /dev/poll once until interrupted or events are ready to be dispatched.
   BOOST_ASIO_DECL void run(long usec, op_queue<operation>& ops);
 
   // Interrupt the select loop.
   BOOST_ASIO_DECL void interrupt();
 
 private:
   // Create the /dev/poll file descriptor. Throws an exception if the descriptor
   // cannot be created.
   BOOST_ASIO_DECL static int do_dev_poll_create();
 
   // Helper function to add a new timer queue.
   BOOST_ASIO_DECL void do_add_timer_queue(timer_queue_base& queue);
 
   // Helper function to remove a timer queue.
   BOOST_ASIO_DECL void do_remove_timer_queue(timer_queue_base& queue);
 
   // Get the timeout value for the /dev/poll DP_POLL operation. The timeout
   // value is returned as a number of milliseconds. A return value of -1
   // indicates that the poll should block indefinitely.
   BOOST_ASIO_DECL int get_timeout(int msec);
 
   // Cancel all operations associated with the given descriptor. The do_cancel
   // function of the handler objects will be invoked. This function does not
   // acquire the dev_poll_reactor's mutex.
   BOOST_ASIO_DECL void cancel_ops_unlocked(socket_type descriptor,
       const boost::system::error_code& ec);
 
   // Add a pending event entry for the given descriptor.
   BOOST_ASIO_DECL ::pollfd& add_pending_event_change(int descriptor);
 
   // The scheduler implementation used to post completions.
   scheduler& scheduler_;
 
   // Mutex to protect access to internal data.
   boost::asio::detail::mutex mutex_;
 
   // The /dev/poll file descriptor.
   int dev_poll_fd_;
 
   // Vector of /dev/poll events waiting to be written to the descriptor.
   std::vector< ::pollfd> pending_event_changes_;
 
   // Hash map to associate a descriptor with a pending event change index.
   hash_map<int, std::size_t> pending_event_change_index_;
 
   // The interrupter is used to break a blocking DP_POLL operation.
   select_interrupter interrupter_;
 
   // The queues of read, write and except operations.
   reactor_op_queue<socket_type> op_queue_[max_ops];
 
   // The timer queues.
   timer_queue_set timer_queues_;
 
   // Whether the service has been shut down.
   bool shutdown_;
 };
 
 } // namespace detail
 } // namespace asio
 } // namespace boost
 
 #include <boost/asio/detail/pop_options.hpp>
 
 #include <boost/asio/detail/impl/dev_poll_reactor.hpp>
 #if defined(BOOST_ASIO_HEADER_ONLY)
 # include <boost/asio/detail/impl/dev_poll_reactor.ipp>
 #endif // defined(BOOST_ASIO_HEADER_ONLY)
 
 #endif // defined(BOOST_ASIO_HAS_DEV_POLL)
 
 #endif // BOOST_ASIO_DETAIL_DEV_POLL_REACTOR_HPP

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