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// // detail/io_uring_service.hpp // ~~~~~~~~~~~~~~~~~~~~~~~~~~~ // // Copyright (c) 2003-2025 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_IO_URING_SERVICE_HPP #define BOOST_ASIO_DETAIL_IO_URING_SERVICE_HPP #if defined(_MSC_VER) && (_MSC_VER >= 1200) # pragma once #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) #include #if defined(BOOST_ASIO_HAS_IO_URING) #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include namespace boost { namespace asio { namespace detail { class io_uring_service : public execution_context_service_base, public scheduler_task { private: // The mutex type used by this reactor. typedef conditionally_enabled_mutex mutex; public: enum op_types { read_op = 0, write_op = 1, except_op = 2, max_ops = 3 }; class io_object; // An I/O queue stores operations that must run serially. class io_queue : operation { friend class io_uring_service; io_object* io_object_; op_queue op_queue_; bool cancel_requested_; BOOST_ASIO_DECL io_queue(); void set_result(int r) { task_result_ = static_cast(r); } BOOST_ASIO_DECL operation* perform_io(int result); BOOST_ASIO_DECL static void do_complete(void* owner, operation* base, const boost::system::error_code& ec, std::size_t bytes_transferred); }; // Per I/O object state. struct io_object { io_object* next_; io_object* prev_; mutex mutex_; io_uring_service* service_; io_queue queues_[max_ops]; bool shutdown_; BOOST_ASIO_DECL io_object(bool locking, int spin_count); }; // Per I/O object data. typedef io_object* per_io_object_data; // Constructor. BOOST_ASIO_DECL io_uring_service(boost::asio::execution_context& ctx); // Destructor. BOOST_ASIO_DECL ~io_uring_service(); // Destroy all user-defined handler objects owned by the service. BOOST_ASIO_DECL void shutdown(); // Recreate internal state following a fork. BOOST_ASIO_DECL void notify_fork( boost::asio::execution_context::fork_event fork_ev); // Initialise the task. BOOST_ASIO_DECL void init_task(); // Register an I/O object with io_uring. BOOST_ASIO_DECL void register_io_object(io_object*& io_obj); // Register an internal I/O object with io_uring. BOOST_ASIO_DECL void register_internal_io_object( io_object*& io_obj, int op_type, io_uring_operation* op); // Register buffers with io_uring. BOOST_ASIO_DECL void register_buffers(const ::iovec* v, unsigned n); // Unregister buffers from io_uring. BOOST_ASIO_DECL void unregister_buffers(); // Post an operation for immediate completion. void post_immediate_completion(operation* op, bool is_continuation); // Start a new operation. The operation will be prepared and submitted to the // io_uring when it is at the head of its I/O operation queue. BOOST_ASIO_DECL void start_op(int op_type, per_io_object_data& io_obj, io_uring_operation* op, bool is_continuation); // Cancel all operations associated with the given I/O object. The handlers // associated with the I/O object will be invoked with the operation_aborted // error. BOOST_ASIO_DECL void cancel_ops(per_io_object_data& io_obj); // Cancel all operations associated with the given I/O object and key. The // handlers associated with the object and key will be invoked with the // operation_aborted error. BOOST_ASIO_DECL void cancel_ops_by_key(per_io_object_data& io_obj, int op_type, void* cancellation_key); // Cancel any operations that are running against the I/O object and remove // its registration from the service. The service resources associated with // the I/O object must be released by calling cleanup_io_object. BOOST_ASIO_DECL void deregister_io_object(per_io_object_data& io_obj); // Perform any post-deregistration cleanup tasks associated with the I/O // object. BOOST_ASIO_DECL void cleanup_io_object(per_io_object_data& io_obj); // Add a new timer queue to the reactor. template void add_timer_queue(timer_queue& timer_queue); // Remove a timer queue from the reactor. template void remove_timer_queue(timer_queue& timer_queue); // Schedule a new operation in the given timer queue to expire at the // specified absolute time. template void schedule_timer(timer_queue& queue, const typename TimeTraits::time_type& time, typename timer_queue::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 std::size_t cancel_timer(timer_queue& queue, typename timer_queue::per_timer_data& timer, std::size_t max_cancelled = (std::numeric_limits::max)()); // Cancel the timer operations associated with the given key. template void cancel_timer_by_key(timer_queue& queue, typename timer_queue::per_timer_data* timer, void* cancellation_key); // Move the timer operations associated with the given timer. template void move_timer(timer_queue& queue, typename timer_queue::per_timer_data& target, typename timer_queue::per_timer_data& source); // Wait on io_uring once until interrupted or events are ready to be // dispatched. BOOST_ASIO_DECL void run(long usec, op_queue& ops); // Interrupt the io_uring wait. BOOST_ASIO_DECL void interrupt(); private: // The hint to pass to io_uring_queue_init to size its data structures. enum { ring_size = 16384 }; // The number of operations to submit in a batch. enum { submit_batch_size = 128 }; // The number of operations to complete in a batch. enum { complete_batch_size = 128 }; // The type used for processing eventfd readiness notifications. class event_fd_read_op; // Initialise the ring. BOOST_ASIO_DECL void init_ring(); // Register the eventfd descriptor for readiness notifications. BOOST_ASIO_DECL void register_with_reactor(); // Allocate a new I/O object. BOOST_ASIO_DECL io_object* allocate_io_object(); // Free an existing I/O object. BOOST_ASIO_DECL void free_io_object(io_object* s); // Helper function to cancel all operations associated with the given I/O // object. This function must be called while the I/O object's mutex is held. // Returns true if there are operations for which cancellation is pending. BOOST_ASIO_DECL bool do_cancel_ops( per_io_object_data& io_obj, op_queue& ops); // 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); // Called to recalculate and update the timeout. BOOST_ASIO_DECL void update_timeout(); // Get the current timeout value. BOOST_ASIO_DECL __kernel_timespec get_timeout() const; // Get a new submission queue entry, flushing the queue if necessary. BOOST_ASIO_DECL ::io_uring_sqe* get_sqe(); // Submit pending submission queue entries. BOOST_ASIO_DECL void submit_sqes(); // Post an operation to submit the pending submission queue entries. BOOST_ASIO_DECL void post_submit_sqes_op(mutex::scoped_lock& lock); // Push an operation to submit the pending submission queue entries. BOOST_ASIO_DECL void push_submit_sqes_op(op_queue& ops); // Helper operation to submit pending submission queue entries. class submit_sqes_op : operation { friend class io_uring_service; io_uring_service* service_; BOOST_ASIO_DECL submit_sqes_op(io_uring_service* s); BOOST_ASIO_DECL static void do_complete(void* owner, operation* base, const boost::system::error_code& ec, std::size_t bytes_transferred); }; // The scheduler implementation used to post completions. scheduler& scheduler_; // Mutex to protect access to internal data. mutex mutex_; // The ring. ::io_uring ring_; // The count of unfinished work. atomic_count outstanding_work_; // The operation used to submit the pending submission queue entries. submit_sqes_op submit_sqes_op_; // The number of pending submission queue entries_. int pending_sqes_; // Whether there is a pending submission operation. bool pending_submit_sqes_op_; // Whether the service has been shut down. bool shutdown_; // Whether I/O locking is enabled. const bool io_locking_; // How any times to spin waiting for the I/O mutex. const int io_locking_spin_count_; // The timer queues. timer_queue_set timer_queues_; // The timespec for the pending timeout operation. Must remain valid while the // operation is outstanding. __kernel_timespec timeout_; // Mutex to protect access to the registered I/O objects. mutex registration_mutex_; // Keep track of all registered I/O objects. object_pool> registered_io_objects_; // Helper class to do post-perform_io cleanup. struct perform_io_cleanup_on_block_exit; friend struct perform_io_cleanup_on_block_exit; // The reactor used to register for eventfd readiness. reactor& reactor_; // The per-descriptor reactor data used for the eventfd. reactor::per_descriptor_data reactor_data_; // The eventfd descriptor used to wait for readiness. int event_fd_; }; } // namespace detail } // namespace asio } // namespace boost #include #include #if defined(BOOST_ASIO_HEADER_ONLY) # include #endif // defined(BOOST_ASIO_HEADER_ONLY) #endif // defined(BOOST_ASIO_HAS_IO_URING) #endif // BOOST_ASIO_DETAIL_IO_URING_SERVICE_HPP