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- #ifndef BOOST_ASIO_DETAIL_SELECT_REACTOR_HPP
- #define BOOST_ASIO_DETAIL_SELECT_REACTOR_HPP
- #if defined(_MSC_VER) && (_MSC_VER >= 1200)
- # pragma once
- #endif
- #include <boost/asio/detail/push_options.hpp>
- #include <boost/asio/detail/socket_types.hpp>
- #include <boost/asio/detail/push_options.hpp>
- #include <cstddef>
- #include <boost/config.hpp>
- #include <boost/date_time/posix_time/posix_time_types.hpp>
- #include <boost/shared_ptr.hpp>
- #include <vector>
- #include <boost/asio/detail/pop_options.hpp>
- #include <boost/asio/io_service.hpp>
- #include <boost/asio/detail/bind_handler.hpp>
- #include <boost/asio/detail/fd_set_adapter.hpp>
- #include <boost/asio/detail/mutex.hpp>
- #include <boost/asio/detail/noncopyable.hpp>
- #include <boost/asio/detail/reactor_op_queue.hpp>
- #include <boost/asio/detail/select_interrupter.hpp>
- #include <boost/asio/detail/select_reactor_fwd.hpp>
- #include <boost/asio/detail/service_base.hpp>
- #include <boost/asio/detail/signal_blocker.hpp>
- #include <boost/asio/detail/socket_ops.hpp>
- #include <boost/asio/detail/socket_types.hpp>
- #include <boost/asio/detail/task_io_service.hpp>
- #include <boost/asio/detail/thread.hpp>
- #include <boost/asio/detail/timer_queue.hpp>
- namespace boost {
- namespace asio {
- namespace detail {
- template <bool Own_Thread>
- class select_reactor
- : public boost::asio::detail::service_base<select_reactor<Own_Thread> >
- {
- public:
-
- struct per_descriptor_data
- {
- };
-
- select_reactor(boost::asio::io_service& io_service)
- : boost::asio::detail::service_base<
- select_reactor<Own_Thread> >(io_service),
- mutex_(),
- select_in_progress_(false),
- interrupter_(),
- read_op_queue_(),
- write_op_queue_(),
- except_op_queue_(),
- pending_cancellations_(),
- stop_thread_(false),
- thread_(0),
- shutdown_(false)
- {
- if (Own_Thread)
- {
- boost::asio::detail::signal_blocker sb;
- thread_ = new boost::asio::detail::thread(
- bind_handler(&select_reactor::call_run_thread, this));
- }
- }
-
- ~select_reactor()
- {
- shutdown_service();
- }
-
- void shutdown_service()
- {
- boost::asio::detail::mutex::scoped_lock lock(mutex_);
- shutdown_ = true;
- stop_thread_ = true;
- lock.unlock();
- if (thread_)
- {
- interrupter_.interrupt();
- thread_->join();
- delete thread_;
- thread_ = 0;
- }
- read_op_queue_.destroy_operations();
- write_op_queue_.destroy_operations();
- except_op_queue_.destroy_operations();
- for (std::size_t i = 0; i < timer_queues_.size(); ++i)
- timer_queues_[i]->destroy_timers();
- timer_queues_.clear();
- }
-
- void init_task()
- {
- if (!Own_Thread)
- {
- typedef task_io_service<select_reactor<Own_Thread> > task_io_service_type;
- use_service<task_io_service_type>(this->get_io_service()).init_task();
- }
- }
-
-
- int register_descriptor(socket_type, per_descriptor_data&)
- {
- return 0;
- }
-
-
- template <typename Handler>
- void start_read_op(socket_type descriptor, per_descriptor_data&,
- Handler handler, bool = true)
- {
- boost::asio::detail::mutex::scoped_lock lock(mutex_);
- if (!shutdown_)
- if (read_op_queue_.enqueue_operation(descriptor, handler))
- interrupter_.interrupt();
- }
-
-
- template <typename Handler>
- void start_write_op(socket_type descriptor, per_descriptor_data&,
- Handler handler, bool = true)
- {
- boost::asio::detail::mutex::scoped_lock lock(mutex_);
- if (!shutdown_)
- if (write_op_queue_.enqueue_operation(descriptor, handler))
- interrupter_.interrupt();
- }
-
-
- template <typename Handler>
- void start_except_op(socket_type descriptor,
- per_descriptor_data&, Handler handler)
- {
- boost::asio::detail::mutex::scoped_lock lock(mutex_);
- if (!shutdown_)
- if (except_op_queue_.enqueue_operation(descriptor, handler))
- interrupter_.interrupt();
- }
-
-
-
- template <typename Handler>
- class connect_handler_wrapper
- {
- public:
- connect_handler_wrapper(socket_type descriptor,
- boost::shared_ptr<bool> completed,
- select_reactor<Own_Thread>& reactor, Handler handler)
- : descriptor_(descriptor),
- completed_(completed),
- reactor_(reactor),
- handler_(handler)
- {
- }
- bool perform(boost::system::error_code& ec,
- std::size_t& bytes_transferred)
- {
-
-
- if (*completed_)
- {
- completed_.reset();
- return true;
- }
-
- *completed_ = true;
- reactor_.enqueue_cancel_ops_unlocked(descriptor_);
-
- return handler_.perform(ec, bytes_transferred);
- }
- void complete(const boost::system::error_code& ec,
- std::size_t bytes_transferred)
- {
- if (completed_.get())
- handler_.complete(ec, bytes_transferred);
- }
- private:
- socket_type descriptor_;
- boost::shared_ptr<bool> completed_;
- select_reactor<Own_Thread>& reactor_;
- Handler handler_;
- };
-
-
-
-
- template <typename Handler>
- void start_connect_op(socket_type descriptor,
- per_descriptor_data&, Handler handler)
- {
- boost::asio::detail::mutex::scoped_lock lock(mutex_);
- if (!shutdown_)
- {
- boost::shared_ptr<bool> completed(new bool(false));
- connect_handler_wrapper<Handler> wrapped_handler(
- descriptor, completed, *this, handler);
- bool interrupt = write_op_queue_.enqueue_operation(
- descriptor, wrapped_handler);
- interrupt = except_op_queue_.enqueue_operation(
- descriptor, wrapped_handler) || interrupt;
- if (interrupt)
- interrupter_.interrupt();
- }
- }
-
-
-
- void cancel_ops(socket_type descriptor, per_descriptor_data&)
- {
- boost::asio::detail::mutex::scoped_lock lock(mutex_);
- cancel_ops_unlocked(descriptor);
- }
-
-
-
-
-
- void enqueue_cancel_ops_unlocked(socket_type descriptor)
- {
- pending_cancellations_.push_back(descriptor);
- }
-
-
- void close_descriptor(socket_type descriptor, per_descriptor_data&)
- {
- boost::asio::detail::mutex::scoped_lock lock(mutex_);
- cancel_ops_unlocked(descriptor);
- }
-
- template <typename Time_Traits>
- void add_timer_queue(timer_queue<Time_Traits>& timer_queue)
- {
- boost::asio::detail::mutex::scoped_lock lock(mutex_);
- timer_queues_.push_back(&timer_queue);
- }
-
- template <typename Time_Traits>
- void remove_timer_queue(timer_queue<Time_Traits>& timer_queue)
- {
- boost::asio::detail::mutex::scoped_lock lock(mutex_);
- for (std::size_t i = 0; i < timer_queues_.size(); ++i)
- {
- if (timer_queues_[i] == &timer_queue)
- {
- timer_queues_.erase(timer_queues_.begin() + i);
- return;
- }
- }
- }
-
-
- template <typename Time_Traits, typename Handler>
- void schedule_timer(timer_queue<Time_Traits>& timer_queue,
- const typename Time_Traits::time_type& time, Handler handler, void* token)
- {
- boost::asio::detail::mutex::scoped_lock lock(mutex_);
- if (!shutdown_)
- if (timer_queue.enqueue_timer(time, handler, token))
- interrupter_.interrupt();
- }
-
-
- template <typename Time_Traits>
- std::size_t cancel_timer(timer_queue<Time_Traits>& timer_queue, void* token)
- {
- boost::asio::detail::mutex::scoped_lock lock(mutex_);
- std::size_t n = timer_queue.cancel_timer(token);
- if (n > 0)
- interrupter_.interrupt();
- return n;
- }
- private:
- friend class task_io_service<select_reactor<Own_Thread> >;
-
- void run(bool block)
- {
- boost::asio::detail::mutex::scoped_lock lock(mutex_);
-
-
- read_op_queue_.perform_cancellations();
- write_op_queue_.perform_cancellations();
- except_op_queue_.perform_cancellations();
- for (std::size_t i = 0; i < timer_queues_.size(); ++i)
- timer_queues_[i]->dispatch_cancellations();
-
- if (stop_thread_)
- {
- complete_operations_and_timers(lock);
- return;
- }
-
-
- if (!block && read_op_queue_.empty() && write_op_queue_.empty()
- && except_op_queue_.empty() && all_timer_queues_are_empty())
- {
- complete_operations_and_timers(lock);
- return;
- }
-
- fd_set_adapter read_fds;
- read_fds.set(interrupter_.read_descriptor());
- read_op_queue_.get_descriptors(read_fds);
- fd_set_adapter write_fds;
- write_op_queue_.get_descriptors(write_fds);
- fd_set_adapter except_fds;
- except_op_queue_.get_descriptors(except_fds);
- socket_type max_fd = read_fds.max_descriptor();
- if (write_fds.max_descriptor() > max_fd)
- max_fd = write_fds.max_descriptor();
- if (except_fds.max_descriptor() > max_fd)
- max_fd = except_fds.max_descriptor();
-
-
- timeval tv_buf = { 0, 0 };
- timeval* tv = block ? get_timeout(tv_buf) : &tv_buf;
- select_in_progress_ = true;
- lock.unlock();
- boost::system::error_code ec;
- int retval = socket_ops::select(static_cast<int>(max_fd + 1),
- read_fds, write_fds, except_fds, tv, ec);
- lock.lock();
- select_in_progress_ = false;
-
- boost::asio::detail::signal_blocker sb;
-
- if (retval > 0 && read_fds.is_set(interrupter_.read_descriptor()))
- interrupter_.reset();
-
- if (retval > 0)
- {
-
-
- except_op_queue_.perform_operations_for_descriptors(
- except_fds, boost::system::error_code());
- read_op_queue_.perform_operations_for_descriptors(
- read_fds, boost::system::error_code());
- write_op_queue_.perform_operations_for_descriptors(
- write_fds, boost::system::error_code());
- except_op_queue_.perform_cancellations();
- read_op_queue_.perform_cancellations();
- write_op_queue_.perform_cancellations();
- }
- for (std::size_t i = 0; i < timer_queues_.size(); ++i)
- {
- timer_queues_[i]->dispatch_timers();
- timer_queues_[i]->dispatch_cancellations();
- }
-
- for (size_t i = 0; i < pending_cancellations_.size(); ++i)
- cancel_ops_unlocked(pending_cancellations_[i]);
- pending_cancellations_.clear();
- complete_operations_and_timers(lock);
- }
-
- void run_thread()
- {
- boost::asio::detail::mutex::scoped_lock lock(mutex_);
- while (!stop_thread_)
- {
- lock.unlock();
- run(true);
- lock.lock();
- }
- }
-
- static void call_run_thread(select_reactor* reactor)
- {
- reactor->run_thread();
- }
-
- void interrupt()
- {
- interrupter_.interrupt();
- }
-
- bool all_timer_queues_are_empty() const
- {
- for (std::size_t i = 0; i < timer_queues_.size(); ++i)
- if (!timer_queues_[i]->empty())
- return false;
- return true;
- }
-
- timeval* get_timeout(timeval& tv)
- {
- if (all_timer_queues_are_empty())
- return 0;
-
-
- boost::posix_time::time_duration minimum_wait_duration
- = boost::posix_time::minutes(5);
- for (std::size_t i = 0; i < timer_queues_.size(); ++i)
- {
- boost::posix_time::time_duration wait_duration
- = timer_queues_[i]->wait_duration();
- if (wait_duration < minimum_wait_duration)
- minimum_wait_duration = wait_duration;
- }
- if (minimum_wait_duration > boost::posix_time::time_duration())
- {
- tv.tv_sec = minimum_wait_duration.total_seconds();
- tv.tv_usec = minimum_wait_duration.total_microseconds() % 1000000;
- }
- else
- {
- tv.tv_sec = 0;
- tv.tv_usec = 0;
- }
- return &tv;
- }
-
-
-
- void cancel_ops_unlocked(socket_type descriptor)
- {
- bool interrupt = read_op_queue_.cancel_operations(descriptor);
- interrupt = write_op_queue_.cancel_operations(descriptor) || interrupt;
- interrupt = except_op_queue_.cancel_operations(descriptor) || interrupt;
- if (interrupt)
- interrupter_.interrupt();
- }
-
-
-
-
- void complete_operations_and_timers(
- boost::asio::detail::mutex::scoped_lock& lock)
- {
- timer_queues_for_cleanup_ = timer_queues_;
- lock.unlock();
- read_op_queue_.complete_operations();
- write_op_queue_.complete_operations();
- except_op_queue_.complete_operations();
- for (std::size_t i = 0; i < timer_queues_for_cleanup_.size(); ++i)
- timer_queues_for_cleanup_[i]->complete_timers();
- }
-
- boost::asio::detail::mutex mutex_;
-
- bool select_in_progress_;
-
- select_interrupter interrupter_;
-
- reactor_op_queue<socket_type> read_op_queue_;
-
- reactor_op_queue<socket_type> write_op_queue_;
-
- reactor_op_queue<socket_type> except_op_queue_;
-
- std::vector<timer_queue_base*> timer_queues_;
-
-
- std::vector<timer_queue_base*> timer_queues_for_cleanup_;
-
- std::vector<socket_type> pending_cancellations_;
-
- bool stop_thread_;
-
- boost::asio::detail::thread* thread_;
-
- bool shutdown_;
- };
- }
- }
- }
- #include <boost/asio/detail/pop_options.hpp>
- #endif
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