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-rw-r--r--lib/asio/detail/select_reactor.hpp238
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-//
-// detail/select_reactor.hpp
-// ~~~~~~~~~~~~~~~~~~~~~~~~~
-//
-// Copyright (c) 2003-2018 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 ASIO_DETAIL_SELECT_REACTOR_HPP
-#define ASIO_DETAIL_SELECT_REACTOR_HPP
-
-#if defined(_MSC_VER) && (_MSC_VER >= 1200)
-# pragma once
-#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
-
-#include "asio/detail/config.hpp"
-
-#if defined(ASIO_HAS_IOCP) \
- || (!defined(ASIO_HAS_DEV_POLL) \
- && !defined(ASIO_HAS_EPOLL) \
- && !defined(ASIO_HAS_KQUEUE) \
- && !defined(ASIO_WINDOWS_RUNTIME))
-
-#include <cstddef>
-#include "asio/detail/fd_set_adapter.hpp"
-#include "asio/detail/limits.hpp"
-#include "asio/detail/mutex.hpp"
-#include "asio/detail/op_queue.hpp"
-#include "asio/detail/reactor_op.hpp"
-#include "asio/detail/reactor_op_queue.hpp"
-#include "asio/detail/select_interrupter.hpp"
-#include "asio/detail/socket_types.hpp"
-#include "asio/detail/timer_queue_base.hpp"
-#include "asio/detail/timer_queue_set.hpp"
-#include "asio/detail/wait_op.hpp"
-#include "asio/execution_context.hpp"
-
-#if defined(ASIO_HAS_IOCP)
-# include "asio/detail/thread.hpp"
-#endif // defined(ASIO_HAS_IOCP)
-
-#include "asio/detail/push_options.hpp"
-
-namespace asio {
-namespace detail {
-
-class select_reactor
- : public execution_context_service_base<select_reactor>
-{
-public:
-#if defined(ASIO_WINDOWS) || defined(__CYGWIN__)
- enum op_types { read_op = 0, write_op = 1, except_op = 2,
- max_select_ops = 3, connect_op = 3, max_ops = 4 };
-#else // defined(ASIO_WINDOWS) || defined(__CYGWIN__)
- enum op_types { read_op = 0, write_op = 1, except_op = 2,
- max_select_ops = 3, connect_op = 1, max_ops = 3 };
-#endif // defined(ASIO_WINDOWS) || defined(__CYGWIN__)
-
- // Per-descriptor data.
- struct per_descriptor_data
- {
- };
-
- // Constructor.
- ASIO_DECL select_reactor(asio::execution_context& ctx);
-
- // Destructor.
- ASIO_DECL ~select_reactor();
-
- // Destroy all user-defined handler objects owned by the service.
- ASIO_DECL void shutdown();
-
- // Recreate internal descriptors following a fork.
- ASIO_DECL void notify_fork(
- asio::execution_context::fork_event fork_ev);
-
- // Initialise the task, but only if the reactor is not in its own thread.
- ASIO_DECL void init_task();
-
- // Register a socket with the reactor. Returns 0 on success, system error
- // code on failure.
- 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.
- ASIO_DECL int register_internal_descriptor(
- int op_type, socket_type descriptor,
- per_descriptor_data& descriptor_data, reactor_op* op);
-
- // Post a reactor operation for immediate completion.
- void post_immediate_completion(reactor_op* op, bool is_continuation)
- {
- scheduler_.post_immediate_completion(op, is_continuation);
- }
-
- // Start a new operation. The reactor operation will be performed when the
- // given descriptor is flagged as ready, or an error has occurred.
- ASIO_DECL void start_op(int op_type, socket_type descriptor,
- per_descriptor_data&, reactor_op* op, bool is_continuation, bool);
-
- // Cancel all operations associated with the given descriptor. The
- // handlers associated with the descriptor will be invoked with the
- // operation_aborted error.
- 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. The reactor resources associated with
- // the descriptor must be released by calling cleanup_descriptor_data.
- 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.
- ASIO_DECL void deregister_internal_descriptor(
- socket_type descriptor, per_descriptor_data&);
-
- // Perform any post-deregistration cleanup tasks associated with the
- // descriptor data.
- ASIO_DECL void cleanup_descriptor_data(per_descriptor_data&);
-
- // Move descriptor registration from one descriptor_data object to another.
- ASIO_DECL void move_descriptor(socket_type descriptor,
- per_descriptor_data& target_descriptor_data,
- per_descriptor_data& source_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)());
-
- // 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 select once until interrupted or events are ready to be dispatched.
- ASIO_DECL void run(long usec, op_queue<operation>& ops);
-
- // Interrupt the select loop.
- ASIO_DECL void interrupt();
-
-private:
-#if defined(ASIO_HAS_IOCP)
- // Run the select loop in the thread.
- ASIO_DECL void run_thread();
-#endif // defined(ASIO_HAS_IOCP)
-
- // Helper function to add a new timer queue.
- ASIO_DECL void do_add_timer_queue(timer_queue_base& queue);
-
- // Helper function to remove a timer queue.
- ASIO_DECL void do_remove_timer_queue(timer_queue_base& queue);
-
- // Get the timeout value for the select call.
- ASIO_DECL timeval* get_timeout(long usec, timeval& tv);
-
- // Cancel all operations associated with the given descriptor. This function
- // does not acquire the select_reactor's mutex.
- ASIO_DECL void cancel_ops_unlocked(socket_type descriptor,
- const asio::error_code& ec);
-
- // The scheduler implementation used to post completions.
-# if defined(ASIO_HAS_IOCP)
- typedef class win_iocp_io_context scheduler_type;
-# else // defined(ASIO_HAS_IOCP)
- typedef class scheduler scheduler_type;
-# endif // defined(ASIO_HAS_IOCP)
- scheduler_type& scheduler_;
-
- // Mutex to protect access to internal data.
- asio::detail::mutex mutex_;
-
- // The interrupter is used to break a blocking select call.
- select_interrupter interrupter_;
-
- // The queues of read, write and except operations.
- reactor_op_queue<socket_type> op_queue_[max_ops];
-
- // The file descriptor sets to be passed to the select system call.
- fd_set_adapter fd_sets_[max_select_ops];
-
- // The timer queues.
- timer_queue_set timer_queues_;
-
-#if defined(ASIO_HAS_IOCP)
- // Helper class to run the reactor loop in a thread.
- class thread_function;
- friend class thread_function;
-
- // Does the reactor loop thread need to stop.
- bool stop_thread_;
-
- // The thread that is running the reactor loop.
- asio::detail::thread* thread_;
-#endif // defined(ASIO_HAS_IOCP)
-
- // Whether the service has been shut down.
- bool shutdown_;
-};
-
-} // namespace detail
-} // namespace asio
-
-#include "asio/detail/pop_options.hpp"
-
-#include "asio/detail/impl/select_reactor.hpp"
-#if defined(ASIO_HEADER_ONLY)
-# include "asio/detail/impl/select_reactor.ipp"
-#endif // defined(ASIO_HEADER_ONLY)
-
-#endif // defined(ASIO_HAS_IOCP)
- // || (!defined(ASIO_HAS_DEV_POLL)
- // && !defined(ASIO_HAS_EPOLL)
- // && !defined(ASIO_HAS_KQUEUE)
- // && !defined(ASIO_WINDOWS_RUNTIME))
-
-#endif // ASIO_DETAIL_SELECT_REACTOR_HPP