diff options
Diffstat (limited to '3rdParty/Boost/src/boost/asio/detail/dev_poll_reactor.hpp')
-rw-r--r-- | 3rdParty/Boost/src/boost/asio/detail/dev_poll_reactor.hpp | 364 |
1 files changed, 48 insertions, 316 deletions
diff --git a/3rdParty/Boost/src/boost/asio/detail/dev_poll_reactor.hpp b/3rdParty/Boost/src/boost/asio/detail/dev_poll_reactor.hpp index e00f501..ef2b0dc 100644 --- a/3rdParty/Boost/src/boost/asio/detail/dev_poll_reactor.hpp +++ b/3rdParty/Boost/src/boost/asio/detail/dev_poll_reactor.hpp @@ -1,6 +1,6 @@ // -// dev_poll_reactor.hpp -// ~~~~~~~~~~~~~~~~~~~~ +// detail/dev_poll_reactor.hpp +// ~~~~~~~~~~~~~~~~~~~~~~~~~~~ // // Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com) // @@ -15,36 +15,28 @@ # pragma once #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) -#include <boost/asio/detail/push_options.hpp> - -#include <boost/asio/detail/dev_poll_reactor_fwd.hpp> +#include <boost/asio/detail/config.hpp> #if defined(BOOST_ASIO_HAS_DEV_POLL) -#include <boost/asio/detail/push_options.hpp> #include <cstddef> #include <vector> -#include <boost/config.hpp> -#include <boost/date_time/posix_time/posix_time_types.hpp> -#include <boost/throw_exception.hpp> #include <sys/devpoll.h> -#include <boost/system/system_error.hpp> -#include <boost/asio/detail/pop_options.hpp> - -#include <boost/asio/error.hpp> -#include <boost/asio/io_service.hpp> +#include <boost/asio/detail/dev_poll_reactor_fwd.hpp> #include <boost/asio/detail/hash_map.hpp> #include <boost/asio/detail/mutex.hpp> #include <boost/asio/detail/op_queue.hpp> #include <boost/asio/detail/reactor_op.hpp> #include <boost/asio/detail/reactor_op_queue.hpp> #include <boost/asio/detail/select_interrupter.hpp> -#include <boost/asio/detail/service_base.hpp> #include <boost/asio/detail/socket_types.hpp> #include <boost/asio/detail/timer_op.hpp> #include <boost/asio/detail/timer_queue_base.hpp> #include <boost/asio/detail/timer_queue_fwd.hpp> #include <boost/asio/detail/timer_queue_set.hpp> +#include <boost/asio/io_service.hpp> + +#include <boost/asio/detail/push_options.hpp> namespace boost { namespace asio { @@ -63,358 +55,93 @@ public: }; // Constructor. - dev_poll_reactor(boost::asio::io_service& io_service) - : boost::asio::detail::service_base<dev_poll_reactor>(io_service), - io_service_(use_service<io_service_impl>(io_service)), - mutex_(), - dev_poll_fd_(do_dev_poll_create()), - interrupter_(), - shutdown_(false) - { - // Add the interrupter's descriptor to /dev/poll. - ::pollfd ev = { 0 }; - ev.fd = interrupter_.read_descriptor(); - ev.events = POLLIN | POLLERR; - ev.revents = 0; - ::write(dev_poll_fd_, &ev, sizeof(ev)); - } + BOOST_ASIO_DECL dev_poll_reactor(boost::asio::io_service& io_service); // Destructor. - ~dev_poll_reactor() - { - shutdown_service(); - ::close(dev_poll_fd_); - } + BOOST_ASIO_DECL ~dev_poll_reactor(); // Destroy all user-defined handler objects owned by the service. - void shutdown_service() - { - boost::asio::detail::mutex::scoped_lock lock(mutex_); - shutdown_ = true; - lock.unlock(); - - op_queue<operation> ops; - - for (int i = 0; i < max_ops; ++i) - op_queue_[i].get_all_operations(ops); - - timer_queues_.get_all_timers(ops); - } + BOOST_ASIO_DECL void shutdown_service(); // Initialise the task. - void init_task() - { - io_service_.init_task(); - } + BOOST_ASIO_DECL void init_task(); // Register a socket with the reactor. Returns 0 on success, system error // code on failure. - int register_descriptor(socket_type, per_descriptor_data&) + BOOST_ASIO_DECL int register_descriptor(socket_type, per_descriptor_data&); + + // Post a reactor operation for immediate completion. + void post_immediate_completion(reactor_op* op) { - return 0; + io_service_.post_immediate_completion(op); } // Start a new operation. The reactor operation will be performed when the // given descriptor is flagged as ready, or an error has occurred. - void start_op(int op_type, socket_type descriptor, - per_descriptor_data&, reactor_op* op, bool allow_speculative) - { - boost::asio::detail::mutex::scoped_lock lock(mutex_); - - if (shutdown_) - return; - - if (allow_speculative) - { - if (op_type != read_op || !op_queue_[except_op].has_operation(descriptor)) - { - if (!op_queue_[op_type].has_operation(descriptor)) - { - if (op->perform()) - { - lock.unlock(); - io_service_.post_immediate_completion(op); - return; - } - } - } - } - - bool first = op_queue_[op_type].enqueue_operation(descriptor, op); - io_service_.work_started(); - if (first) - { - ::pollfd& ev = add_pending_event_change(descriptor); - ev.events = POLLERR | POLLHUP; - if (op_type == read_op - || op_queue_[read_op].has_operation(descriptor)) - ev.events |= POLLIN; - if (op_type == write_op - || op_queue_[write_op].has_operation(descriptor)) - ev.events |= POLLOUT; - if (op_type == except_op - || op_queue_[except_op].has_operation(descriptor)) - ev.events |= POLLPRI; - interrupter_.interrupt(); - } - } + BOOST_ASIO_DECL void start_op(int op_type, socket_type descriptor, + per_descriptor_data&, reactor_op* op, 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. - void cancel_ops(socket_type descriptor, per_descriptor_data&) - { - boost::asio::detail::mutex::scoped_lock lock(mutex_); - cancel_ops_unlocked(descriptor, boost::asio::error::operation_aborted); - } + BOOST_ASIO_DECL void cancel_ops(socket_type descriptor, per_descriptor_data&); // Cancel any operations that are running against the descriptor and remove // its registration from the reactor. - void close_descriptor(socket_type descriptor, per_descriptor_data&) - { - boost::asio::detail::mutex::scoped_lock lock(mutex_); - - // Remove the descriptor from /dev/poll. - ::pollfd& ev = add_pending_event_change(descriptor); - ev.events = POLLREMOVE; - interrupter_.interrupt(); - - // Cancel any outstanding operations associated with the descriptor. - cancel_ops_unlocked(descriptor, boost::asio::error::operation_aborted); - } + BOOST_ASIO_DECL void close_descriptor( + socket_type descriptor, per_descriptor_data&); // Add a new timer queue to the reactor. template <typename Time_Traits> - void add_timer_queue(timer_queue<Time_Traits>& timer_queue) - { - boost::asio::detail::mutex::scoped_lock lock(mutex_); - timer_queues_.insert(&timer_queue); - } + 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>& timer_queue) - { - boost::asio::detail::mutex::scoped_lock lock(mutex_); - timer_queues_.erase(&timer_queue); - } + 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>& timer_queue, - const typename Time_Traits::time_type& time, timer_op* op, void* token) - { - boost::asio::detail::mutex::scoped_lock lock(mutex_); - if (!shutdown_) - { - bool earliest = timer_queue.enqueue_timer(time, op, token); - io_service_.work_started(); - if (earliest) - interrupter_.interrupt(); - } - } + void schedule_timer(timer_queue<Time_Traits>& queue, + const typename Time_Traits::time_type& time, + typename timer_queue<Time_Traits>::per_timer_data& timer, timer_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>& timer_queue, void* token) - { - boost::asio::detail::mutex::scoped_lock lock(mutex_); - op_queue<operation> ops; - std::size_t n = timer_queue.cancel_timer(token, ops); - lock.unlock(); - io_service_.post_deferred_completions(ops); - return n; - } + std::size_t cancel_timer(timer_queue<Time_Traits>& queue, + typename timer_queue<Time_Traits>::per_timer_data& timer); // Run /dev/poll once until interrupted or events are ready to be dispatched. - void run(bool block, op_queue<operation>& ops) - { - boost::asio::detail::mutex::scoped_lock lock(mutex_); - - // We can return immediately if there's no work to do and the reactor is - // not supposed to block. - if (!block && op_queue_[read_op].empty() && op_queue_[write_op].empty() - && op_queue_[except_op].empty() && timer_queues_.all_empty()) - return; - - // Write the pending event registration changes to the /dev/poll descriptor. - std::size_t events_size = sizeof(::pollfd) * pending_event_changes_.size(); - if (events_size > 0) - { - errno = 0; - int result = ::write(dev_poll_fd_, - &pending_event_changes_[0], events_size); - if (result != static_cast<int>(events_size)) - { - boost::system::error_code ec = boost::system::error_code( - errno, boost::asio::error::get_system_category()); - for (std::size_t i = 0; i < pending_event_changes_.size(); ++i) - { - int descriptor = pending_event_changes_[i].fd; - for (int j = 0; j < max_ops; ++j) - op_queue_[j].cancel_operations(descriptor, ops, ec); - } - } - pending_event_changes_.clear(); - pending_event_change_index_.clear(); - } - - int timeout = block ? get_timeout() : 0; - lock.unlock(); - - // Block on the /dev/poll descriptor. - ::pollfd events[128] = { { 0 } }; - ::dvpoll dp = { 0 }; - dp.dp_fds = events; - dp.dp_nfds = 128; - dp.dp_timeout = timeout; - int num_events = ::ioctl(dev_poll_fd_, DP_POLL, &dp); - - lock.lock(); - - // Dispatch the waiting events. - for (int i = 0; i < num_events; ++i) - { - int descriptor = events[i].fd; - if (descriptor == interrupter_.read_descriptor()) - { - interrupter_.reset(); - } - else - { - bool more_reads = false; - bool more_writes = false; - bool more_except = false; - - // Exception operations must be processed first to ensure that any - // out-of-band data is read before normal data. - if (events[i].events & (POLLPRI | POLLERR | POLLHUP)) - more_except = - op_queue_[except_op].perform_operations(descriptor, ops); - else - more_except = op_queue_[except_op].has_operation(descriptor); - - if (events[i].events & (POLLIN | POLLERR | POLLHUP)) - more_reads = op_queue_[read_op].perform_operations(descriptor, ops); - else - more_reads = op_queue_[read_op].has_operation(descriptor); - - if (events[i].events & (POLLOUT | POLLERR | POLLHUP)) - more_writes = op_queue_[write_op].perform_operations(descriptor, ops); - else - more_writes = op_queue_[write_op].has_operation(descriptor); - - if ((events[i].events & (POLLERR | POLLHUP)) != 0 - && !more_except && !more_reads && !more_writes) - { - // If we have an event and no operations associated with the - // descriptor then we need to delete the descriptor from /dev/poll. - // The poll operation can produce POLLHUP or POLLERR events when there - // is no operation pending, so if we do not remove the descriptor we - // can end up in a tight polling loop. - ::pollfd ev = { 0 }; - ev.fd = descriptor; - ev.events = POLLREMOVE; - ev.revents = 0; - ::write(dev_poll_fd_, &ev, sizeof(ev)); - } - else - { - ::pollfd ev = { 0 }; - ev.fd = descriptor; - ev.events = POLLERR | POLLHUP; - if (more_reads) - ev.events |= POLLIN; - if (more_writes) - ev.events |= POLLOUT; - if (more_except) - ev.events |= POLLPRI; - ev.revents = 0; - int result = ::write(dev_poll_fd_, &ev, sizeof(ev)); - if (result != sizeof(ev)) - { - boost::system::error_code ec(errno, - boost::asio::error::get_system_category()); - for (int j = 0; j < max_ops; ++j) - op_queue_[j].cancel_operations(descriptor, ops, ec); - } - } - } - } - timer_queues_.get_ready_timers(ops); - } + BOOST_ASIO_DECL void run(bool block, op_queue<operation>& ops); // Interrupt the select loop. - void interrupt() - { - interrupter_.interrupt(); - } + BOOST_ASIO_DECL void interrupt(); private: // Create the /dev/poll file descriptor. Throws an exception if the descriptor // cannot be created. - static int do_dev_poll_create() - { - int fd = ::open("/dev/poll", O_RDWR); - if (fd == -1) - { - boost::throw_exception( - boost::system::system_error( - boost::system::error_code(errno, - boost::asio::error::get_system_category()), - "/dev/poll")); - } - return fd; - } + BOOST_ASIO_DECL static int do_dev_poll_create(); + + // 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); // Get the timeout value for the /dev/poll DP_POLL operation. The timeout // value is returned as a number of milliseconds. A return value of -1 // indicates that the poll should block indefinitely. - int get_timeout() - { - // By default we will wait no longer than 5 minutes. This will ensure that - // any changes to the system clock are detected after no longer than this. - return timer_queues_.wait_duration_msec(5 * 60 * 1000); - } + BOOST_ASIO_DECL int get_timeout(); // Cancel all operations associated with the given descriptor. The do_cancel // function of the handler objects will be invoked. This function does not // acquire the dev_poll_reactor's mutex. - void cancel_ops_unlocked(socket_type descriptor, - const boost::system::error_code& ec) - { - bool need_interrupt = false; - op_queue<operation> ops; - for (int i = 0; i < max_ops; ++i) - need_interrupt = op_queue_[i].cancel_operations( - descriptor, ops, ec) || need_interrupt; - io_service_.post_deferred_completions(ops); - if (need_interrupt) - interrupter_.interrupt(); - } + BOOST_ASIO_DECL void cancel_ops_unlocked(socket_type descriptor, + const boost::system::error_code& ec); // Add a pending event entry for the given descriptor. - ::pollfd& add_pending_event_change(int descriptor) - { - hash_map<int, std::size_t>::iterator iter - = pending_event_change_index_.find(descriptor); - if (iter == pending_event_change_index_.end()) - { - std::size_t index = pending_event_changes_.size(); - pending_event_changes_.reserve(pending_event_changes_.size() + 1); - pending_event_change_index_.insert(std::make_pair(descriptor, index)); - pending_event_changes_.push_back(::pollfd()); - pending_event_changes_[index].fd = descriptor; - pending_event_changes_[index].revents = 0; - return pending_event_changes_[index]; - } - else - { - return pending_event_changes_[iter->second]; - } - } + BOOST_ASIO_DECL ::pollfd& add_pending_event_change(int descriptor); // The io_service implementation used to post completions. io_service_impl& io_service_; @@ -448,8 +175,13 @@ private: } // namespace asio } // namespace boost -#endif // defined(BOOST_ASIO_HAS_DEV_POLL) - #include <boost/asio/detail/pop_options.hpp> +#include <boost/asio/detail/impl/dev_poll_reactor.hpp> +#if defined(BOOST_ASIO_HEADER_ONLY) +# include <boost/asio/detail/impl/dev_poll_reactor.ipp> +#endif // defined(BOOST_ASIO_HEADER_ONLY) + +#endif // defined(BOOST_ASIO_HAS_DEV_POLL) + #endif // BOOST_ASIO_DETAIL_DEV_POLL_REACTOR_HPP |