267 lines
8.9 KiB
C++
267 lines
8.9 KiB
C++
//
|
|
// detail/epoll_reactor.hpp
|
|
// ~~~~~~~~~~~~~~~~~~~~~~~~
|
|
//
|
|
// Copyright (c) 2003-2021 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
|