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author | Remko Tronçon <git@el-tramo.be> | 2010-02-11 12:14:00 (GMT) |
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committer | Remko Tronçon <git@el-tramo.be> | 2010-02-11 12:14:00 (GMT) |
commit | 0efa7c32aaf21a29b42b5926cc116007056843be (patch) | |
tree | 882f663a5dd0e65694bf6077b71086dd77fd7ff8 /3rdParty/Boost/boost/asio/detail/select_reactor.hpp | |
parent | 1d20eabbc32274b491b4c2bedf73d19933d97bfd (diff) | |
download | swift-contrib-0efa7c32aaf21a29b42b5926cc116007056843be.zip swift-contrib-0efa7c32aaf21a29b42b5926cc116007056843be.tar.bz2 |
Moved some modules into separate git modules.
Diffstat (limited to '3rdParty/Boost/boost/asio/detail/select_reactor.hpp')
m--------- | 3rdParty/Boost | 0 | ||||
-rw-r--r-- | 3rdParty/Boost/boost/asio/detail/select_reactor.hpp | 546 |
2 files changed, 0 insertions, 546 deletions
diff --git a/3rdParty/Boost b/3rdParty/Boost new file mode 160000 +Subproject 3bbdbc8cf1996f23d9a366da8bac0f97be6ad79 diff --git a/3rdParty/Boost/boost/asio/detail/select_reactor.hpp b/3rdParty/Boost/boost/asio/detail/select_reactor.hpp deleted file mode 100644 index 77caf54..0000000 --- a/3rdParty/Boost/boost/asio/detail/select_reactor.hpp +++ /dev/null @@ -1,546 +0,0 @@ -// -// select_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_SELECT_REACTOR_HPP -#define BOOST_ASIO_DETAIL_SELECT_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/socket_types.hpp> // Must come before posix_time. - -#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: - // Per-descriptor data. - struct per_descriptor_data - { - }; - - // Constructor. - 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)); - } - } - - // Destructor. - ~select_reactor() - { - shutdown_service(); - } - - // 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<select_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_) - if (read_op_queue_.enqueue_operation(descriptor, handler)) - 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_) - if (write_op_queue_.enqueue_operation(descriptor, handler)) - 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_) - if (except_op_queue_.enqueue_operation(descriptor, handler)) - interrupter_.interrupt(); - } - - // Wrapper for connect handlers to enable the handler object to be placed - // in both the write and the except operation queues, but ensure that only - // one of the handlers is called. - 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) - { - // Check whether one of the handlers has already been called. If it has, - // then we don't want to do anything in this handler. - if (*completed_) - { - completed_.reset(); // Indicate that this handler should not complete. - return true; - } - - // Cancel the other reactor operation for the connection. - *completed_ = true; - reactor_.enqueue_cancel_ops_unlocked(descriptor_); - - // Call the contained handler. - 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_; - }; - - // Start new write and exception operations. The handler object will be - // invoked when the given descriptor is ready for writing or has exception - // information available, or an error has occurred. The handler will be called - // only once. - 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(); - } - } - - // 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); - } - - // Enqueue cancellation of all operations associated with the given - // descriptor. The handlers associated with the descriptor will be invoked - // with the operation_aborted error. This function does not acquire the - // select_reactor's mutex, and so should only be used when the reactor lock is - // already held. - void enqueue_cancel_ops_unlocked(socket_type descriptor) - { - pending_cancellations_.push_back(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_); - 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<select_reactor<Own_Thread> >; - - // Run select 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; - } - - // Set up the descriptor sets. - 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(); - - // Block on the select call without holding the lock so that new - // operations can be started while the call is executing. - 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; - - // Block signals while dispatching operations. - boost::asio::detail::signal_blocker sb; - - // Reset the interrupter. - if (retval > 0 && read_fds.is_set(interrupter_.read_descriptor())) - interrupter_.reset(); - - // Dispatch all ready operations. - if (retval > 0) - { - // Exception operations must be processed first to ensure that any - // out-of-band data is read before normal data. - 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(); - } - - // 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(select_reactor* reactor) - { - reactor->run_thread(); - } - - // Interrupt the select loop. - void interrupt() - { - interrupter_.interrupt(); - } - - // 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 select call. - timeval* get_timeout(timeval& tv) - { - if (all_timer_queues_are_empty()) - return 0; - - // 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()) - { - 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; - } - - // 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 select_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(); - } - - // Mutex to protect access to internal data. - boost::asio::detail::mutex mutex_; - - // Whether the select loop is currently running or not. - bool select_in_progress_; - - // The interrupter is used to break a blocking select call. - 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 exception 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 - -#include <boost/asio/detail/pop_options.hpp> - -#endif // BOOST_ASIO_DETAIL_SELECT_REACTOR_HPP |