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+//
+// detail/dev_poll_reactor.hpp
+// ~~~~~~~~~~~~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2012 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_queue_base.hpp>
+#include <boost/asio/detail/timer_queue_fwd.hpp>
+#include <boost/asio/detail/timer_queue_set.hpp>
+#include <boost/asio/detail/wait_op.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, 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)());
+
+ // 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