diff options
Diffstat (limited to '3rdParty/Boost/boost/asio/detail/dev_poll_reactor.hpp')
m--------- | 3rdParty/Boost | 0 | ||||
-rw-r--r-- | 3rdParty/Boost/boost/asio/detail/dev_poll_reactor.hpp | 678 |
2 files changed, 0 insertions, 678 deletions
diff --git a/3rdParty/Boost b/3rdParty/Boost new file mode 160000 +Subproject 3bbdbc8cf1996f23d9a366da8bac0f97be6ad79 diff --git a/3rdParty/Boost/boost/asio/detail/dev_poll_reactor.hpp b/3rdParty/Boost/boost/asio/detail/dev_poll_reactor.hpp deleted file mode 100644 index 8739085..0000000 --- a/3rdParty/Boost/boost/asio/detail/dev_poll_reactor.hpp +++ /dev/null @@ -1,678 +0,0 @@ -// -// dev_poll_reactor.hpp -// ~~~~~~~~~~~~~~~~~~~~ -// -// Copyright (c) 2003-2008 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_DEV_POLL_REACTOR_HPP -#define BOOST_ASIO_DETAIL_DEV_POLL_REACTOR_HPP - -#if defined(_MSC_VER) && (_MSC_VER >= 1200) -# 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> - -#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/bind_handler.hpp> -#include <boost/asio/detail/hash_map.hpp> -#include <boost/asio/detail/mutex.hpp> -#include <boost/asio/detail/task_io_service.hpp> -#include <boost/asio/detail/thread.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/signal_blocker.hpp> -#include <boost/asio/detail/socket_types.hpp> -#include <boost/asio/detail/timer_queue.hpp> - -namespace boost { -namespace asio { -namespace detail { - -template <bool Own_Thread> -class dev_poll_reactor - : public boost::asio::detail::service_base<dev_poll_reactor<Own_Thread> > -{ -public: - // Per-descriptor data. - struct per_descriptor_data - { - }; - - // Constructor. - dev_poll_reactor(boost::asio::io_service& io_service) - : boost::asio::detail::service_base< - dev_poll_reactor<Own_Thread> >(io_service), - mutex_(), - dev_poll_fd_(do_dev_poll_create()), - wait_in_progress_(false), - interrupter_(), - read_op_queue_(), - write_op_queue_(), - except_op_queue_(), - pending_cancellations_(), - stop_thread_(false), - thread_(0), - shutdown_(false) - { - // Start the reactor's internal thread only if needed. - if (Own_Thread) - { - boost::asio::detail::signal_blocker sb; - thread_ = new boost::asio::detail::thread( - bind_handler(&dev_poll_reactor::call_run_thread, this)); - } - - // 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)); - } - - // Destructor. - ~dev_poll_reactor() - { - shutdown_service(); - ::close(dev_poll_fd_); - } - - // Destroy all user-defined handler objects owned by the 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(); - } - - // Initialise the task, but only if the reactor is not in its own thread. - void init_task() - { - if (!Own_Thread) - { - typedef task_io_service<dev_poll_reactor<Own_Thread> > - task_io_service_type; - use_service<task_io_service_type>(this->get_io_service()).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&) - { - return 0; - } - - // Start a new read operation. The handler object will be invoked when the - // given descriptor is ready to be read, or an error has occurred. - template <typename Handler> - void start_read_op(socket_type descriptor, per_descriptor_data&, - Handler handler, bool allow_speculative_read = true) - { - boost::asio::detail::mutex::scoped_lock lock(mutex_); - - if (shutdown_) - return; - - if (allow_speculative_read) - { - if (!read_op_queue_.has_operation(descriptor)) - { - boost::system::error_code ec; - std::size_t bytes_transferred = 0; - if (handler.perform(ec, bytes_transferred)) - { - handler.complete(ec, bytes_transferred); - return; - } - } - } - - if (read_op_queue_.enqueue_operation(descriptor, handler)) - { - ::pollfd& ev = add_pending_event_change(descriptor); - ev.events = POLLIN | POLLERR | POLLHUP; - if (write_op_queue_.has_operation(descriptor)) - ev.events |= POLLOUT; - if (except_op_queue_.has_operation(descriptor)) - ev.events |= POLLPRI; - interrupter_.interrupt(); - } - } - - // Start a new write operation. The handler object will be invoked when the - // given descriptor is ready to be written, or an error has occurred. - template <typename Handler> - void start_write_op(socket_type descriptor, per_descriptor_data&, - Handler handler, bool allow_speculative_write = true) - { - boost::asio::detail::mutex::scoped_lock lock(mutex_); - - if (shutdown_) - return; - - if (allow_speculative_write) - { - if (!write_op_queue_.has_operation(descriptor)) - { - boost::system::error_code ec; - std::size_t bytes_transferred = 0; - if (handler.perform(ec, bytes_transferred)) - { - handler.complete(ec, bytes_transferred); - return; - } - } - } - - if (write_op_queue_.enqueue_operation(descriptor, handler)) - { - ::pollfd& ev = add_pending_event_change(descriptor); - ev.events = POLLOUT | POLLERR | POLLHUP; - if (read_op_queue_.has_operation(descriptor)) - ev.events |= POLLIN; - if (except_op_queue_.has_operation(descriptor)) - ev.events |= POLLPRI; - interrupter_.interrupt(); - } - } - - // Start a new exception operation. The handler object will be invoked when - // the given descriptor has exception information, or an error has occurred. - 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_) - return; - - if (except_op_queue_.enqueue_operation(descriptor, handler)) - { - ::pollfd& ev = add_pending_event_change(descriptor); - ev.events = POLLPRI | POLLERR | POLLHUP; - if (read_op_queue_.has_operation(descriptor)) - ev.events |= POLLIN; - if (write_op_queue_.has_operation(descriptor)) - ev.events |= POLLOUT; - interrupter_.interrupt(); - } - } - - // Start a new write operation. The handler object will be invoked when the - // information available, or an error has occurred. - 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_) - return; - - if (write_op_queue_.enqueue_operation(descriptor, handler)) - { - ::pollfd& ev = add_pending_event_change(descriptor); - ev.events = POLLOUT | POLLERR | POLLHUP; - if (read_op_queue_.has_operation(descriptor)) - ev.events |= POLLIN; - if (except_op_queue_.has_operation(descriptor)) - ev.events |= POLLPRI; - interrupter_.interrupt(); - } - } - - // 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); - } - - // 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); - } - - // 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_.push_back(&timer_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_); - 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; - } - } - } - - // Schedule a timer in the given timer queue to expire at the specified - // absolute time. The handler object will be invoked when the timer expires. - 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(); - } - - // Cancel the timer associated with the given token. Returns the number of - // handlers 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_); - std::size_t n = timer_queue.cancel_timer(token); - if (n > 0) - interrupter_.interrupt(); - return n; - } - -private: - friend class task_io_service<dev_poll_reactor<Own_Thread> >; - - // Run /dev/poll once until interrupted or events are ready to be dispatched. - void run(bool block) - { - boost::asio::detail::mutex::scoped_lock lock(mutex_); - - // Dispatch any operation cancellations that were made while the select - // loop was not running. - 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(); - - // Check if the thread is supposed to stop. - if (stop_thread_) - { - complete_operations_and_timers(lock); - return; - } - - // We can return immediately if there's no work to do and the reactor is - // not supposed to block. - 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; - } - - // Write the pending event registration changes to the /dev/poll descriptor. - std::size_t events_size = sizeof(::pollfd) * pending_event_changes_.size(); - errno = 0; - int result = ::write(dev_poll_fd_, - &pending_event_changes_[0], events_size); - if (result != static_cast<int>(events_size)) - { - for (std::size_t i = 0; i < pending_event_changes_.size(); ++i) - { - int descriptor = pending_event_changes_[i].fd; - boost::system::error_code ec = boost::system::error_code( - errno, boost::asio::error::get_system_category()); - read_op_queue_.perform_all_operations(descriptor, ec); - write_op_queue_.perform_all_operations(descriptor, ec); - except_op_queue_.perform_all_operations(descriptor, ec); - } - } - pending_event_changes_.clear(); - pending_event_change_index_.clear(); - - int timeout = block ? get_timeout() : 0; - wait_in_progress_ = true; - 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(); - wait_in_progress_ = false; - - // Block signals while performing operations. - boost::asio::detail::signal_blocker sb; - - // 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; - boost::system::error_code ec; - - // 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 = except_op_queue_.perform_operation(descriptor, ec); - else - more_except = except_op_queue_.has_operation(descriptor); - - if (events[i].events & (POLLIN | POLLERR | POLLHUP)) - more_reads = read_op_queue_.perform_operation(descriptor, ec); - else - more_reads = read_op_queue_.has_operation(descriptor); - - if (events[i].events & (POLLOUT | POLLERR | POLLHUP)) - more_writes = write_op_queue_.perform_operation(descriptor, ec); - else - more_writes = write_op_queue_.has_operation(descriptor); - - if ((events[i].events & (POLLERR | POLLHUP)) != 0 - && (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)) - { - ec = boost::system::error_code(errno, - boost::asio::error::get_system_category()); - read_op_queue_.perform_all_operations(descriptor, ec); - write_op_queue_.perform_all_operations(descriptor, ec); - except_op_queue_.perform_all_operations(descriptor, ec); - } - } - } - } - 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_timers(); - timer_queues_[i]->dispatch_cancellations(); - } - - // Issue any pending 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); - } - - // Run the select loop in the thread. - void run_thread() - { - boost::asio::detail::mutex::scoped_lock lock(mutex_); - while (!stop_thread_) - { - lock.unlock(); - run(true); - lock.lock(); - } - } - - // Entry point for the select loop thread. - static void call_run_thread(dev_poll_reactor* reactor) - { - reactor->run_thread(); - } - - // Interrupt the select loop. - void interrupt() - { - interrupter_.interrupt(); - } - - // 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; - } - - // Check if all timer queues are empty. - 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; - } - - // 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() - { - if (all_timer_queues_are_empty()) - return -1; - - // 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. - 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()) - { - int milliseconds = minimum_wait_duration.total_milliseconds(); - return milliseconds > 0 ? milliseconds : 1; - } - else - { - return 0; - } - } - - // 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) - { - 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(); - } - - // Clean up operations and timers. We must not hold the lock since the - // destructors may make calls back into this reactor. We make a copy of the - // vector of timer queues since the original may be modified while the lock - // is not held. - 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(); - } - - // 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]; - } - } - - // Mutex to protect access to internal data. - boost::asio::detail::mutex mutex_; - - // The /dev/poll file descriptor. - int dev_poll_fd_; - - // Vector of /dev/poll events waiting to be written to the descriptor. - std::vector< ::pollfd> pending_event_changes_; - - // Hash map to associate a descriptor with a pending event change index. - hash_map<int, std::size_t> pending_event_change_index_; - - // Whether the DP_POLL operation is currently in progress - bool wait_in_progress_; - - // The interrupter is used to break a blocking DP_POLL operation. - select_interrupter interrupter_; - - // The queue of read operations. - reactor_op_queue<socket_type> read_op_queue_; - - // The queue of write operations. - reactor_op_queue<socket_type> write_op_queue_; - - // The queue of except operations. - reactor_op_queue<socket_type> except_op_queue_; - - // The timer queues. - std::vector<timer_queue_base*> timer_queues_; - - // A copy of the timer queues, used when cleaning up timers. The copy is - // stored as a class data member to avoid unnecessary memory allocation. - std::vector<timer_queue_base*> timer_queues_for_cleanup_; - - // The descriptors that are pending cancellation. - std::vector<socket_type> pending_cancellations_; - - // Does the reactor loop thread need to stop. - bool stop_thread_; - - // The thread that is running the reactor loop. - boost::asio::detail::thread* thread_; - - // Whether the service has been shut down. - bool shutdown_; -}; - -} // namespace detail -} // namespace asio -} // namespace boost - -#endif // defined(BOOST_ASIO_HAS_DEV_POLL) - -#include <boost/asio/detail/pop_options.hpp> - -#endif // BOOST_ASIO_DETAIL_DEV_POLL_REACTOR_HPP |