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+//
+// detail/select_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_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);
+
+ // 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 all operations associated with the given descriptor and key. The
+ // handlers associated with the descriptor will be invoked with the
+ // operation_aborted error.
+ ASIO_DECL void cancel_ops_by_key(socket_type descriptor,
+ per_descriptor_data& descriptor_data,
+ int op_type, void* cancellation_key);
+
+ // 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)());
+
+ // Cancel the timer operations associated with the given key.
+ template <typename Time_Traits>
+ void cancel_timer_by_key(timer_queue<Time_Traits>& queue,
+ typename timer_queue<Time_Traits>::per_timer_data* timer,
+ void* cancellation_key);
+
+ // 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