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author | Remko Tronçon <git@el-tramo.be> | 2010-03-28 15:46:49 (GMT) |
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committer | Remko Tronçon <git@el-tramo.be> | 2010-03-28 15:46:49 (GMT) |
commit | f53a1ef582494458301b97bf6e546be52d7ff7e8 (patch) | |
tree | 7571b5cbcbd8a8f1dd1c966c9045b6cb69f0e295 /3rdParty/Boost/src/boost/asio/io_service.hpp | |
parent | 638345680d72ca6acaf123f2c8c1c391f696e371 (diff) | |
download | swift-contrib-f53a1ef582494458301b97bf6e546be52d7ff7e8.zip swift-contrib-f53a1ef582494458301b97bf6e546be52d7ff7e8.tar.bz2 |
Moving submodule contents back.
Diffstat (limited to '3rdParty/Boost/src/boost/asio/io_service.hpp')
-rw-r--r-- | 3rdParty/Boost/src/boost/asio/io_service.hpp | 554 |
1 files changed, 554 insertions, 0 deletions
diff --git a/3rdParty/Boost/src/boost/asio/io_service.hpp b/3rdParty/Boost/src/boost/asio/io_service.hpp new file mode 100644 index 0000000..e50224a --- /dev/null +++ b/3rdParty/Boost/src/boost/asio/io_service.hpp @@ -0,0 +1,554 @@ +// +// io_service.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_IO_SERVICE_HPP +#define BOOST_ASIO_IO_SERVICE_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/push_options.hpp> +#include <cstddef> +#include <stdexcept> +#include <typeinfo> +#include <boost/config.hpp> +#include <boost/throw_exception.hpp> +#include <boost/system/error_code.hpp> +#include <boost/asio/detail/pop_options.hpp> + +#include <boost/asio/detail/dev_poll_reactor_fwd.hpp> +#include <boost/asio/detail/epoll_reactor_fwd.hpp> +#include <boost/asio/detail/kqueue_reactor_fwd.hpp> +#include <boost/asio/detail/noncopyable.hpp> +#include <boost/asio/detail/select_reactor_fwd.hpp> +#include <boost/asio/detail/service_registry_fwd.hpp> +#include <boost/asio/detail/signal_init.hpp> +#include <boost/asio/detail/task_io_service_fwd.hpp> +#include <boost/asio/detail/win_iocp_io_service_fwd.hpp> +#include <boost/asio/detail/winsock_init.hpp> +#include <boost/asio/detail/wrapped_handler.hpp> + +namespace boost { +namespace asio { + +class io_service; +template <typename Service> Service& use_service(io_service& ios); +template <typename Service> void add_service(io_service& ios, Service* svc); +template <typename Service> bool has_service(io_service& ios); + +/// Provides core I/O functionality. +/** + * The io_service class provides the core I/O functionality for users of the + * asynchronous I/O objects, including: + * + * @li boost::asio::ip::tcp::socket + * @li boost::asio::ip::tcp::acceptor + * @li boost::asio::ip::udp::socket + * @li boost::asio::deadline_timer. + * + * The io_service class also includes facilities intended for developers of + * custom asynchronous services. + * + * @par Thread Safety + * @e Distinct @e objects: Safe.@n + * @e Shared @e objects: Safe, with the exception that calling reset() + * while there are unfinished run() calls results in undefined behaviour. + * + * @par Concepts: + * Dispatcher. + * + * @par Effect of exceptions thrown from handlers + * + * If an exception is thrown from a handler, the exception is allowed to + * propagate through the throwing thread's invocation of + * boost::asio::io_service::run(), boost::asio::io_service::run_one(), + * boost::asio::io_service::poll() or boost::asio::io_service::poll_one(). + * No other threads that are calling any of these functions are affected. It is + * then the responsibility of the application to catch the exception. + * + * After the exception has been caught, the + * boost::asio::io_service::run(), boost::asio::io_service::run_one(), + * boost::asio::io_service::poll() or boost::asio::io_service::poll_one() + * call may be restarted @em without the need for an intervening call to + * boost::asio::io_service::reset(). This allows the thread to rejoin the + * io_service's thread pool without impacting any other threads in the pool. + * + * For example: + * + * @code + * boost::asio::io_service io_service; + * ... + * for (;;) + * { + * try + * { + * io_service.run(); + * break; // run() exited normally + * } + * catch (my_exception& e) + * { + * // Deal with exception as appropriate. + * } + * } + * @endcode + * + * @par Stopping the io_service from running out of work + * + * Some applications may need to prevent an io_service's run() call from + * returning when there is no more work to do. For example, the io_service may + * be being run in a background thread that is launched prior to the + * application's asynchronous operations. The run() call may be kept running by + * creating an object of type boost::asio::io_service::work: + * + * @code boost::asio::io_service io_service; + * boost::asio::io_service::work work(io_service); + * ... @endcode + * + * To effect a shutdown, the application will then need to call the io_service's + * stop() member function. This will cause the io_service run() call to return + * as soon as possible, abandoning unfinished operations and without permitting + * ready handlers to be dispatched. + * + * Alternatively, if the application requires that all operations and handlers + * be allowed to finish normally, the work object may be explicitly destroyed. + * + * @code boost::asio::io_service io_service; + * auto_ptr<boost::asio::io_service::work> work( + * new boost::asio::io_service::work(io_service)); + * ... + * work.reset(); // Allow run() to exit. @endcode + */ +class io_service + : private noncopyable +{ +private: + // The type of the platform-specific implementation. +#if defined(BOOST_ASIO_HAS_IOCP) + typedef detail::win_iocp_io_service impl_type; + friend class detail::win_iocp_overlapped_ptr; +#elif defined(BOOST_ASIO_HAS_EPOLL) + typedef detail::task_io_service<detail::epoll_reactor<false> > impl_type; +#elif defined(BOOST_ASIO_HAS_KQUEUE) + typedef detail::task_io_service<detail::kqueue_reactor<false> > impl_type; +#elif defined(BOOST_ASIO_HAS_DEV_POLL) + typedef detail::task_io_service<detail::dev_poll_reactor<false> > impl_type; +#else + typedef detail::task_io_service<detail::select_reactor<false> > impl_type; +#endif + +public: + class work; + friend class work; + + class id; + + class service; + + class strand; + + /// Constructor. + io_service(); + + /// Constructor. + /** + * Construct with a hint about the required level of concurrency. + * + * @param concurrency_hint A suggestion to the implementation on how many + * threads it should allow to run simultaneously. + */ + explicit io_service(std::size_t concurrency_hint); + + /// Destructor. + ~io_service(); + + /// Run the io_service's event processing loop. + /** + * The run() function blocks until all work has finished and there are no + * more handlers to be dispatched, or until the io_service has been stopped. + * + * Multiple threads may call the run() function to set up a pool of threads + * from which the io_service may execute handlers. All threads that are + * waiting in the pool are equivalent and the io_service may choose any one + * of them to invoke a handler. + * + * The run() function may be safely called again once it has completed only + * after a call to reset(). + * + * @return The number of handlers that were executed. + * + * @throws boost::system::system_error Thrown on failure. + * + * @note The poll() function may also be used to dispatch ready handlers, + * but without blocking. + */ + std::size_t run(); + + /// Run the io_service's event processing loop. + /** + * The run() function blocks until all work has finished and there are no + * more handlers to be dispatched, or until the io_service has been stopped. + * + * Multiple threads may call the run() function to set up a pool of threads + * from which the io_service may execute handlers. All threads that are + * waiting in the pool are equivalent and the io_service may choose any one + * of them to invoke a handler. + * + * The run() function may be safely called again once it has completed only + * after a call to reset(). + * + * @param ec Set to indicate what error occurred, if any. + * + * @return The number of handlers that were executed. + * + * @note The poll() function may also be used to dispatch ready handlers, + * but without blocking. + */ + std::size_t run(boost::system::error_code& ec); + + /// Run the io_service's event processing loop to execute at most one handler. + /** + * The run_one() function blocks until one handler has been dispatched, or + * until the io_service has been stopped. + * + * @return The number of handlers that were executed. + * + * @throws boost::system::system_error Thrown on failure. + */ + std::size_t run_one(); + + /// Run the io_service's event processing loop to execute at most one handler. + /** + * The run_one() function blocks until one handler has been dispatched, or + * until the io_service has been stopped. + * + * @param ec Set to indicate what error occurred, if any. + * + * @return The number of handlers that were executed. + */ + std::size_t run_one(boost::system::error_code& ec); + + /// Run the io_service's event processing loop to execute ready handlers. + /** + * The poll() function runs handlers that are ready to run, without blocking, + * until the io_service has been stopped or there are no more ready handlers. + * + * @return The number of handlers that were executed. + * + * @throws boost::system::system_error Thrown on failure. + */ + std::size_t poll(); + + /// Run the io_service's event processing loop to execute ready handlers. + /** + * The poll() function runs handlers that are ready to run, without blocking, + * until the io_service has been stopped or there are no more ready handlers. + * + * @param ec Set to indicate what error occurred, if any. + * + * @return The number of handlers that were executed. + */ + std::size_t poll(boost::system::error_code& ec); + + /// Run the io_service's event processing loop to execute one ready handler. + /** + * The poll_one() function runs at most one handler that is ready to run, + * without blocking. + * + * @return The number of handlers that were executed. + * + * @throws boost::system::system_error Thrown on failure. + */ + std::size_t poll_one(); + + /// Run the io_service's event processing loop to execute one ready handler. + /** + * The poll_one() function runs at most one handler that is ready to run, + * without blocking. + * + * @param ec Set to indicate what error occurred, if any. + * + * @return The number of handlers that were executed. + */ + std::size_t poll_one(boost::system::error_code& ec); + + /// Stop the io_service's event processing loop. + /** + * This function does not block, but instead simply signals the io_service to + * stop. All invocations of its run() or run_one() member functions should + * return as soon as possible. Subsequent calls to run(), run_one(), poll() + * or poll_one() will return immediately until reset() is called. + */ + void stop(); + + /// Reset the io_service in preparation for a subsequent run() invocation. + /** + * This function must be called prior to any second or later set of + * invocations of the run(), run_one(), poll() or poll_one() functions when a + * previous invocation of these functions returned due to the io_service + * being stopped or running out of work. This function allows the io_service + * to reset any internal state, such as a "stopped" flag. + * + * This function must not be called while there are any unfinished calls to + * the run(), run_one(), poll() or poll_one() functions. + */ + void reset(); + + /// Request the io_service to invoke the given handler. + /** + * This function is used to ask the io_service to execute the given handler. + * + * The io_service guarantees that the handler will only be called in a thread + * in which the run(), run_one(), poll() or poll_one() member functions is + * currently being invoked. The handler may be executed inside this function + * if the guarantee can be met. + * + * @param handler The handler to be called. The io_service will make + * a copy of the handler object as required. The function signature of the + * handler must be: @code void handler(); @endcode + */ + template <typename CompletionHandler> + void dispatch(CompletionHandler handler); + + /// Request the io_service to invoke the given handler and return immediately. + /** + * This function is used to ask the io_service to execute the given handler, + * but without allowing the io_service to call the handler from inside this + * function. + * + * The io_service guarantees that the handler will only be called in a thread + * in which the run(), run_one(), poll() or poll_one() member functions is + * currently being invoked. + * + * @param handler The handler to be called. The io_service will make + * a copy of the handler object as required. The function signature of the + * handler must be: @code void handler(); @endcode + */ + template <typename CompletionHandler> + void post(CompletionHandler handler); + + /// Create a new handler that automatically dispatches the wrapped handler + /// on the io_service. + /** + * This function is used to create a new handler function object that, when + * invoked, will automatically pass the wrapped handler to the io_service's + * dispatch function. + * + * @param handler The handler to be wrapped. The io_service will make a copy + * of the handler object as required. The function signature of the handler + * must be: @code void handler(A1 a1, ... An an); @endcode + * + * @return A function object that, when invoked, passes the wrapped handler to + * the io_service's dispatch function. Given a function object with the + * signature: + * @code R f(A1 a1, ... An an); @endcode + * If this function object is passed to the wrap function like so: + * @code io_service.wrap(f); @endcode + * then the return value is a function object with the signature + * @code void g(A1 a1, ... An an); @endcode + * that, when invoked, executes code equivalent to: + * @code io_service.dispatch(boost::bind(f, a1, ... an)); @endcode + */ + template <typename Handler> +#if defined(GENERATING_DOCUMENTATION) + unspecified +#else + detail::wrapped_handler<io_service&, Handler> +#endif + wrap(Handler handler); + + /// Obtain the service object corresponding to the given type. + /** + * This function is used to locate a service object that corresponds to + * the given service type. If there is no existing implementation of the + * service, then the io_service will create a new instance of the service. + * + * @param ios The io_service object that owns the service. + * + * @return The service interface implementing the specified service type. + * Ownership of the service interface is not transferred to the caller. + */ + template <typename Service> + friend Service& use_service(io_service& ios); + + /// Add a service object to the io_service. + /** + * This function is used to add a service to the io_service. + * + * @param ios The io_service object that owns the service. + * + * @param svc The service object. On success, ownership of the service object + * is transferred to the io_service. When the io_service object is destroyed, + * it will destroy the service object by performing: + * @code delete static_cast<io_service::service*>(svc) @endcode + * + * @throws boost::asio::service_already_exists Thrown if a service of the + * given type is already present in the io_service. + * + * @throws boost::asio::invalid_service_owner Thrown if the service's owning + * io_service is not the io_service object specified by the ios parameter. + */ + template <typename Service> + friend void add_service(io_service& ios, Service* svc); + + /// Determine if an io_service contains a specified service type. + /** + * This function is used to determine whether the io_service contains a + * service object corresponding to the given service type. + * + * @param ios The io_service object that owns the service. + * + * @return A boolean indicating whether the io_service contains the service. + */ + template <typename Service> + friend bool has_service(io_service& ios); + +private: +#if defined(BOOST_WINDOWS) || defined(__CYGWIN__) + detail::winsock_init<> init_; +#elif defined(__sun) || defined(__QNX__) || defined(__hpux) || defined(_AIX) \ + || defined(__osf__) + detail::signal_init<> init_; +#endif + + // The service registry. + boost::asio::detail::service_registry* service_registry_; + + // The implementation. + impl_type& impl_; +}; + +/// Class to inform the io_service when it has work to do. +/** + * The work class is used to inform the io_service when work starts and + * finishes. This ensures that the io_service's run() function will not exit + * while work is underway, and that it does exit when there is no unfinished + * work remaining. + * + * The work class is copy-constructible so that it may be used as a data member + * in a handler class. It is not assignable. + */ +class io_service::work +{ +public: + /// Constructor notifies the io_service that work is starting. + /** + * The constructor is used to inform the io_service that some work has begun. + * This ensures that the io_service's run() function will not exit while the + * work is underway. + */ + explicit work(boost::asio::io_service& io_service); + + /// Copy constructor notifies the io_service that work is starting. + /** + * The constructor is used to inform the io_service that some work has begun. + * This ensures that the io_service's run() function will not exit while the + * work is underway. + */ + work(const work& other); + + /// Destructor notifies the io_service that the work is complete. + /** + * The destructor is used to inform the io_service that some work has + * finished. Once the count of unfinished work reaches zero, the io_service's + * run() function is permitted to exit. + */ + ~work(); + + /// (Deprecated: use get_io_service().) Get the io_service associated with the + /// work. + boost::asio::io_service& io_service(); + + /// Get the io_service associated with the work. + boost::asio::io_service& get_io_service(); + +private: + // Prevent assignment. + void operator=(const work& other); + + // The io_service. + boost::asio::io_service& io_service_; +}; + +/// Class used to uniquely identify a service. +class io_service::id + : private noncopyable +{ +public: + /// Constructor. + id() {} +}; + +/// Base class for all io_service services. +class io_service::service + : private noncopyable +{ +public: + /// (Deprecated: use get_io_service().) Get the io_service object that owns + /// the service. + boost::asio::io_service& io_service(); + + /// Get the io_service object that owns the service. + boost::asio::io_service& get_io_service(); + +protected: + /// Constructor. + /** + * @param owner The io_service object that owns the service. + */ + service(boost::asio::io_service& owner); + + /// Destructor. + virtual ~service(); + +private: + /// Destroy all user-defined handler objects owned by the service. + virtual void shutdown_service() = 0; + + friend class boost::asio::detail::service_registry; + boost::asio::io_service& owner_; + const std::type_info* type_info_; + const boost::asio::io_service::id* id_; + service* next_; +}; + +/// Exception thrown when trying to add a duplicate service to an io_service. +class service_already_exists + : public std::logic_error +{ +public: + service_already_exists() + : std::logic_error("Service already exists.") + { + } +}; + +/// Exception thrown when trying to add a service object to an io_service where +/// the service has a different owner. +class invalid_service_owner + : public std::logic_error +{ +public: + invalid_service_owner() + : std::logic_error("Invalid service owner.") + { + } +}; + +} // namespace asio +} // namespace boost + +#include <boost/asio/impl/io_service.ipp> + +#include <boost/asio/detail/pop_options.hpp> + +#endif // BOOST_ASIO_IO_SERVICE_HPP |