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Diffstat (limited to '3rdParty/Boost/src/boost/asio/detail/task_io_service_2lock.hpp')
-rw-r--r-- | 3rdParty/Boost/src/boost/asio/detail/task_io_service_2lock.hpp | 475 |
1 files changed, 0 insertions, 475 deletions
diff --git a/3rdParty/Boost/src/boost/asio/detail/task_io_service_2lock.hpp b/3rdParty/Boost/src/boost/asio/detail/task_io_service_2lock.hpp deleted file mode 100644 index 71bceef..0000000 --- a/3rdParty/Boost/src/boost/asio/detail/task_io_service_2lock.hpp +++ /dev/null @@ -1,475 +0,0 @@ -// -// task_io_service_2lock.hpp -// ~~~~~~~~~~~~~~~~~~~~~~~~~ -// -// Copyright (c) 2003-2010 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_TASK_IO_SERVICE_2LOCK_HPP -#define BOOST_ASIO_DETAIL_TASK_IO_SERVICE_2LOCK_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/io_service.hpp> -#include <boost/asio/detail/call_stack.hpp> -#include <boost/asio/detail/event.hpp> -#include <boost/asio/detail/handler_alloc_helpers.hpp> -#include <boost/asio/detail/handler_invoke_helpers.hpp> -#include <boost/asio/detail/indirect_handler_queue.hpp> -#include <boost/asio/detail/mutex.hpp> -#include <boost/asio/detail/service_base.hpp> -#include <boost/asio/detail/task_io_service_fwd.hpp> - -#include <boost/asio/detail/push_options.hpp> -#include <boost/detail/atomic_count.hpp> -#include <boost/system/error_code.hpp> -#include <boost/asio/detail/pop_options.hpp> - -namespace boost { -namespace asio { -namespace detail { - -// An alternative task_io_service implementation based on a two-lock queue. - -template <typename Task> -class task_io_service - : public boost::asio::detail::service_base<task_io_service<Task> > -{ -public: - typedef indirect_handler_queue handler_queue; - - // Constructor. - task_io_service(boost::asio::io_service& io_service) - : boost::asio::detail::service_base<task_io_service<Task> >(io_service), - front_mutex_(), - back_mutex_(), - task_(0), - outstanding_work_(0), - front_stopped_(false), - back_stopped_(false), - back_shutdown_(false), - back_first_idle_thread_(0), - back_task_thread_(0) - { - } - - void init(size_t /*concurrency_hint*/) - { - } - - // Destroy all user-defined handler objects owned by the service. - void shutdown_service() - { - boost::asio::detail::mutex::scoped_lock back_lock(back_mutex_); - back_shutdown_ = true; - back_lock.unlock(); - - // Destroy handler objects. - while (handler_queue::handler* h = handler_queue_.pop()) - if (h != &task_handler_) - h->destroy(); - - // Reset to initial state. - task_ = 0; - } - - // Initialise the task, if required. - void init_task() - { - boost::asio::detail::mutex::scoped_lock back_lock(back_mutex_); - if (!back_shutdown_ && !task_) - { - task_ = &use_service<Task>(this->get_io_service()); - handler_queue_.push(&task_handler_); - interrupt_one_idle_thread(back_lock); - } - } - - // Run the event loop until interrupted or no more work. - size_t run(boost::system::error_code& ec) - { - if (outstanding_work_ == 0) - { - stop(); - ec = boost::system::error_code(); - return 0; - } - - typename call_stack<task_io_service>::context ctx(this); - - idle_thread_info this_idle_thread; - this_idle_thread.next = 0; - - size_t n = 0; - while (do_one(&this_idle_thread, ec)) - if (n != (std::numeric_limits<size_t>::max)()) - ++n; - return n; - } - - // Run until interrupted or one operation is performed. - size_t run_one(boost::system::error_code& ec) - { - if (outstanding_work_ == 0) - { - stop(); - ec = boost::system::error_code(); - return 0; - } - - typename call_stack<task_io_service>::context ctx(this); - - idle_thread_info this_idle_thread; - this_idle_thread.next = 0; - - return do_one(&this_idle_thread, ec); - } - - // Poll for operations without blocking. - size_t poll(boost::system::error_code& ec) - { - if (outstanding_work_ == 0) - { - stop(); - ec = boost::system::error_code(); - return 0; - } - - typename call_stack<task_io_service>::context ctx(this); - - size_t n = 0; - while (do_one(0, ec)) - if (n != (std::numeric_limits<size_t>::max)()) - ++n; - return n; - } - - // Poll for one operation without blocking. - size_t poll_one(boost::system::error_code& ec) - { - if (outstanding_work_ == 0) - { - stop(); - ec = boost::system::error_code(); - return 0; - } - - typename call_stack<task_io_service>::context ctx(this); - - return do_one(0, ec); - } - - // Interrupt the event processing loop. - void stop() - { - boost::asio::detail::mutex::scoped_lock front_lock(front_mutex_); - front_stopped_ = true; - front_lock.unlock(); - - boost::asio::detail::mutex::scoped_lock back_lock(back_mutex_); - back_stopped_ = true; - interrupt_all_idle_threads(back_lock); - } - - // Reset in preparation for a subsequent run invocation. - void reset() - { - boost::asio::detail::mutex::scoped_lock front_lock(front_mutex_); - front_stopped_ = false; - front_lock.unlock(); - - boost::asio::detail::mutex::scoped_lock back_lock(back_mutex_); - back_stopped_ = false; - } - - // Notify that some work has started. - void work_started() - { - ++outstanding_work_; - } - - // Notify that some work has finished. - void work_finished() - { - if (--outstanding_work_ == 0) - stop(); - } - - // Request invocation of the given handler. - template <typename Handler> - void dispatch(Handler handler) - { - if (call_stack<task_io_service>::contains(this)) - boost_asio_handler_invoke_helpers::invoke(handler, handler); - else - post(handler); - } - - // Request invocation of the given handler and return immediately. - template <typename Handler> - void post(Handler handler) - { - // Allocate and construct an operation to wrap the handler. - handler_queue::scoped_ptr ptr(handler_queue::wrap(handler)); - - boost::asio::detail::mutex::scoped_lock back_lock(back_mutex_); - - // If the service has been shut down we silently discard the handler. - if (back_shutdown_) - return; - - // Add the handler to the end of the queue. - handler_queue_.push(ptr.get()); - ptr.release(); - - // An undelivered handler is treated as unfinished work. - ++outstanding_work_; - - // Wake up a thread to execute the handler. - interrupt_one_idle_thread(back_lock); - } - -private: - struct idle_thread_info; - - size_t do_one(idle_thread_info* this_idle_thread, - boost::system::error_code& ec) - { - bool task_has_run = false; - for (;;) - { - // The front lock must be held before we can pop items from the queue. - boost::asio::detail::mutex::scoped_lock front_lock(front_mutex_); - if (front_stopped_) - { - ec = boost::system::error_code(); - return 0; - } - - if (handler_queue::handler* h = handler_queue_.pop()) - { - if (h == &task_handler_) - { - bool more_handlers = handler_queue_.poppable(); - unsigned long front_version = handler_queue_.front_version(); - front_lock.unlock(); - - // The task is always added to the back of the queue when we exit - // this block. - task_cleanup c(*this); - - // If we're polling and the task has already run then we're done. - bool polling = !this_idle_thread; - if (task_has_run && polling) - { - ec = boost::system::error_code(); - return 0; - } - - // If we're considering going idle we need to check whether the queue - // is still empty. If it is, add the thread to the list of idle - // threads. - if (!more_handlers && !polling) - { - boost::asio::detail::mutex::scoped_lock back_lock(back_mutex_); - if (back_stopped_) - { - ec = boost::system::error_code(); - return 0; - } - else if (front_version == handler_queue_.back_version()) - { - back_task_thread_ = this_idle_thread; - } - else - { - more_handlers = true; - } - } - - // Run the task. May throw an exception. Only block if the handler - // queue is empty and we're not polling, otherwise we want to return - // as soon as possible. - task_has_run = true; - task_->run(!more_handlers && !polling); - } - else - { - front_lock.unlock(); - handler_cleanup c(*this); - - // Invoke the handler. May throw an exception. - h->invoke(); // invoke() deletes the handler object - - ec = boost::system::error_code(); - return 1; - } - } - else if (this_idle_thread) - { - unsigned long front_version = handler_queue_.front_version(); - front_lock.unlock(); - - // If we're considering going idle we need to check whether the queue - // is still empty. If it is, add the thread to the list of idle - // threads. - boost::asio::detail::mutex::scoped_lock back_lock(back_mutex_); - if (back_stopped_) - { - ec = boost::system::error_code(); - return 0; - } - else if (front_version == handler_queue_.back_version()) - { - this_idle_thread->next = back_first_idle_thread_; - back_first_idle_thread_ = this_idle_thread; - this_idle_thread->wakeup_event.clear(back_lock); - this_idle_thread->wakeup_event.wait(back_lock); - } - } - else - { - ec = boost::system::error_code(); - return 0; - } - } - } - - // Interrupt a single idle thread. - void interrupt_one_idle_thread( - boost::asio::detail::mutex::scoped_lock& back_lock) - { - if (back_first_idle_thread_) - { - idle_thread_info* idle_thread = back_first_idle_thread_; - back_first_idle_thread_ = idle_thread->next; - idle_thread->next = 0; - idle_thread->wakeup_event.signal(back_lock); - } - else if (back_task_thread_ && task_) - { - back_task_thread_ = 0; - task_->interrupt(); - } - } - - // Interrupt all idle threads. - void interrupt_all_idle_threads( - boost::asio::detail::mutex::scoped_lock& back_lock) - { - while (back_first_idle_thread_) - { - idle_thread_info* idle_thread = back_first_idle_thread_; - back_first_idle_thread_ = idle_thread->next; - idle_thread->next = 0; - idle_thread->wakeup_event.signal(back_lock); - } - - if (back_task_thread_ && task_) - { - back_task_thread_ = 0; - task_->interrupt(); - } - } - - // Helper class to perform task-related operations on block exit. - class task_cleanup; - friend class task_cleanup; - class task_cleanup - { - public: - task_cleanup(task_io_service& task_io_svc) - : task_io_service_(task_io_svc) - { - } - - ~task_cleanup() - { - // Reinsert the task at the end of the handler queue. - boost::asio::detail::mutex::scoped_lock back_lock( - task_io_service_.back_mutex_); - task_io_service_.back_task_thread_ = 0; - task_io_service_.handler_queue_.push(&task_io_service_.task_handler_); - } - - private: - task_io_service& task_io_service_; - }; - - // Helper class to perform handler-related operations on block exit. - class handler_cleanup - { - public: - handler_cleanup(task_io_service& task_io_svc) - : task_io_service_(task_io_svc) - { - } - - ~handler_cleanup() - { - task_io_service_.work_finished(); - } - - private: - task_io_service& task_io_service_; - }; - - // Mutexes to protect access to internal data. - boost::asio::detail::mutex front_mutex_; - boost::asio::detail::mutex back_mutex_; - - // The task to be run by this service. - Task* task_; - - // Handler object to represent the position of the task in the queue. - class task_handler - : public handler_queue::handler - { - public: - task_handler() - : handler_queue::handler(0, 0) - { - } - } task_handler_; - - // The count of unfinished work. - boost::detail::atomic_count outstanding_work_; - - // The queue of handlers that are ready to be delivered. - handler_queue handler_queue_; - - // Flag to indicate that the dispatcher has been stopped. - bool front_stopped_; - bool back_stopped_; - - // Flag to indicate that the dispatcher has been shut down. - bool back_shutdown_; - - // Structure containing information about an idle thread. - struct idle_thread_info - { - event wakeup_event; - idle_thread_info* next; - }; - - // The number of threads that are currently idle. - idle_thread_info* back_first_idle_thread_; - - // The thread that is currently blocked on the task. - idle_thread_info* back_task_thread_; -}; - -} // namespace detail -} // namespace asio -} // namespace boost - -#include <boost/asio/detail/pop_options.hpp> - -#endif // BOOST_ASIO_DETAIL_TASK_IO_SERVICE_2LOCK_HPP |