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-//
-// detail/epoll_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_EPOLL_REACTOR_HPP
-#define ASIO_DETAIL_EPOLL_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_EPOLL)
-
-#include "asio/detail/atomic_count.hpp"
-#include "asio/detail/conditionally_enabled_mutex.hpp"
-#include "asio/detail/limits.hpp"
-#include "asio/detail/object_pool.hpp"
-#include "asio/detail/op_queue.hpp"
-#include "asio/detail/reactor_op.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_TIMERFD)
-# include <sys/timerfd.h>
-#endif // defined(ASIO_HAS_TIMERFD)
-
-#include "asio/detail/push_options.hpp"
-
-namespace asio {
-namespace detail {
-
-class epoll_reactor
- : public execution_context_service_base<epoll_reactor>
-{
-private:
- // The mutex type used by this reactor.
- typedef conditionally_enabled_mutex mutex;
-
-public:
- enum op_types { read_op = 0, write_op = 1,
- connect_op = 1, except_op = 2, max_ops = 3 };
-
- // Per-descriptor queues.
- class descriptor_state : operation
- {
- friend class epoll_reactor;
- friend class object_pool_access;
-
- descriptor_state* next_;
- descriptor_state* prev_;
-
- mutex mutex_;
- epoll_reactor* reactor_;
- int descriptor_;
- uint32_t registered_events_;
- op_queue<reactor_op> op_queue_[max_ops];
- bool try_speculative_[max_ops];
- bool shutdown_;
-
- ASIO_DECL descriptor_state(bool locking);
- void set_ready_events(uint32_t events) { task_result_ = events; }
- void add_ready_events(uint32_t events) { task_result_ |= events; }
- ASIO_DECL operation* perform_io(uint32_t events);
- ASIO_DECL static void do_complete(
- void* owner, operation* base,
- const asio::error_code& ec, std::size_t bytes_transferred);
- };
-
- // Per-descriptor data.
- typedef descriptor_state* per_descriptor_data;
-
- // Constructor.
- ASIO_DECL epoll_reactor(asio::execution_context& ctx);
-
- // Destructor.
- ASIO_DECL ~epoll_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.
- 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 descriptor,
- per_descriptor_data& 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);
-
- // 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);
-
- // 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& descriptor_data, reactor_op* op,
- bool is_continuation, 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.
- ASIO_DECL void cancel_ops(socket_type descriptor,
- per_descriptor_data& 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& 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& descriptor_data);
-
- // Perform any post-deregistration cleanup tasks associated with the
- // descriptor data.
- ASIO_DECL void cleanup_descriptor_data(
- per_descriptor_data& descriptor_data);
-
- // Add a new timer queue to the reactor.
- template <typename Time_Traits>
- void add_timer_queue(timer_queue<Time_Traits>& timer_queue);
-
- // Remove a timer queue from the reactor.
- template <typename Time_Traits>
- void remove_timer_queue(timer_queue<Time_Traits>& timer_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 epoll 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:
- // The hint to pass to epoll_create to size its data structures.
- enum { epoll_size = 20000 };
-
- // Create the epoll file descriptor. Throws an exception if the descriptor
- // cannot be created.
- ASIO_DECL static int do_epoll_create();
-
- // Create the timerfd file descriptor. Does not throw.
- ASIO_DECL static int do_timerfd_create();
-
- // Allocate a new descriptor state object.
- ASIO_DECL descriptor_state* allocate_descriptor_state();
-
- // Free an existing descriptor state object.
- ASIO_DECL void free_descriptor_state(descriptor_state* s);
-
- // 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);
-
- // Called to recalculate and update the timeout.
- ASIO_DECL void update_timeout();
-
- // Get the timeout value for the epoll_wait call. The timeout value is
- // returned as a number of milliseconds. A return value of -1 indicates
- // that epoll_wait should block indefinitely.
- ASIO_DECL int get_timeout(int msec);
-
-#if defined(ASIO_HAS_TIMERFD)
- // Get the timeout value for the timer descriptor. The return value is the
- // flag argument to be used when calling timerfd_settime.
- ASIO_DECL int get_timeout(itimerspec& ts);
-#endif // defined(ASIO_HAS_TIMERFD)
-
- // The scheduler implementation used to post completions.
- scheduler& scheduler_;
-
- // Mutex to protect access to internal data.
- mutex mutex_;
-
- // The interrupter is used to break a blocking epoll_wait call.
- select_interrupter interrupter_;
-
- // The epoll file descriptor.
- int epoll_fd_;
-
- // The timer file descriptor.
- int timer_fd_;
-
- // The timer queues.
- timer_queue_set timer_queues_;
-
- // Whether the service has been shut down.
- bool shutdown_;
-
- // Mutex to protect access to the registered descriptors.
- mutex registered_descriptors_mutex_;
-
- // Keep track of all registered descriptors.
- object_pool<descriptor_state> registered_descriptors_;
-
- // Helper class to do post-perform_io cleanup.
- struct perform_io_cleanup_on_block_exit;
- friend struct perform_io_cleanup_on_block_exit;
-};
-
-} // namespace detail
-} // namespace asio
-
-#include "asio/detail/pop_options.hpp"
-
-#include "asio/detail/impl/epoll_reactor.hpp"
-#if defined(ASIO_HEADER_ONLY)
-# include "asio/detail/impl/epoll_reactor.ipp"
-#endif // defined(ASIO_HEADER_ONLY)
-
-#endif // defined(ASIO_HAS_EPOLL)
-
-#endif // ASIO_DETAIL_EPOLL_REACTOR_HPP