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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
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