/Src/Dependencies/Boost/boost/asio/detail/dev_poll_reactor.hpp
http://hadesmem.googlecode.com/ · C++ Header · 213 lines · 105 code · 49 blank · 59 comment · 1 complexity · aaf020bb75163ea673823d071eae87ab MD5 · raw file
- //
- // detail/dev_poll_reactor.hpp
- // ~~~~~~~~~~~~~~~~~~~~~~~~~~~
- //
- // Copyright (c) 2003-2011 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 <boost/limits.hpp>
- #include <cstddef>
- #include <vector>
- #include <sys/devpoll.h>
- #include <boost/asio/detail/dev_poll_reactor_fwd.hpp>
- #include <boost/asio/detail/hash_map.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/select_interrupter.hpp>
- #include <boost/asio/detail/socket_types.hpp>
- #include <boost/asio/detail/timer_op.hpp>
- #include <boost/asio/detail/timer_queue_base.hpp>
- #include <boost/asio/detail/timer_queue_fwd.hpp>
- #include <boost/asio/detail/timer_queue_set.hpp>
- #include <boost/asio/io_service.hpp>
- #include <boost/asio/detail/push_options.hpp>
- namespace boost {
- namespace asio {
- namespace detail {
- class dev_poll_reactor
- : public boost::asio::detail::service_base<dev_poll_reactor>
- {
- 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::io_service& io_service);
- // Destructor.
- BOOST_ASIO_DECL ~dev_poll_reactor();
- // Destroy all user-defined handler objects owned by the service.
- BOOST_ASIO_DECL void shutdown_service();
- // Recreate internal descriptors following a fork.
- BOOST_ASIO_DECL void fork_service(
- boost::asio::io_service::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(reactor_op* op)
- {
- io_service_.post_immediate_completion(op);
- }
- // 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 allow_speculative);
- // 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 any operations that are running against the descriptor and remove
- // its registration from the reactor.
- BOOST_ASIO_DECL void deregister_descriptor(socket_type descriptor,
- per_descriptor_data&, bool closing);
- // Cancel any operations that are running against the descriptor and remove
- // its registration from the reactor.
- BOOST_ASIO_DECL void deregister_internal_descriptor(
- socket_type descriptor, 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, timer_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)());
- // Run /dev/poll once until interrupted or events are ready to be dispatched.
- BOOST_ASIO_DECL void run(bool block, 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();
- // 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);
- // Helper class used to reregister descriptors after a fork.
- class fork_helper;
- friend class fork_helper;
- // Add a pending event entry for the given descriptor.
- BOOST_ASIO_DECL ::pollfd& add_pending_event_change(int descriptor);
- // The io_service implementation used to post completions.
- io_service_impl& io_service_;
- // 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