/Src/Dependencies/Boost/boost/asio/detail/signal_set_service.hpp
http://hadesmem.googlecode.com/ · C++ Header · 213 lines · 117 code · 50 blank · 46 comment · 4 complexity · 3b08e401bdd46031a666d9c56ebd6ac2 MD5 · raw file
- //
- // detail/signal_set_service.hpp
- // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- //
- // Copyright (c) 2003-2011 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_SIGNAL_SET_SERVICE_HPP
- #define BOOST_ASIO_DETAIL_SIGNAL_SET_SERVICE_HPP
- #if defined(_MSC_VER) && (_MSC_VER >= 1200)
- # pragma once
- #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
- #include <boost/asio/detail/config.hpp>
- #include <csignal>
- #include <cstddef>
- #include <boost/asio/error.hpp>
- #include <boost/asio/io_service.hpp>
- #include <boost/asio/detail/handler_alloc_helpers.hpp>
- #include <boost/asio/detail/op_queue.hpp>
- #include <boost/asio/detail/signal_handler.hpp>
- #include <boost/asio/detail/signal_op.hpp>
- #include <boost/asio/detail/socket_types.hpp>
- #if !defined(BOOST_WINDOWS) && !defined(__CYGWIN__)
- # include <boost/asio/detail/reactor.hpp>
- #endif // !defined(BOOST_WINDOWS) && !defined(__CYGWIN__)
- #include <boost/asio/detail/push_options.hpp>
- namespace boost {
- namespace asio {
- namespace detail {
- #if defined(NSIG) && (NSIG > 0)
- enum { max_signal_number = NSIG };
- #else
- enum { max_signal_number = 128 };
- #endif
- extern BOOST_ASIO_DECL struct signal_state* get_signal_state();
- extern "C" BOOST_ASIO_DECL void asio_signal_handler(int signal_number);
- class signal_set_service
- {
- public:
- // Type used for tracking an individual signal registration.
- class registration
- {
- public:
- // Default constructor.
- registration()
- : signal_number_(0),
- queue_(0),
- undelivered_(0),
- next_in_table_(0),
- prev_in_table_(0),
- next_in_set_(0)
- {
- }
- private:
- // Only this service will have access to the internal values.
- friend class signal_set_service;
- // The signal number that is registered.
- int signal_number_;
- // The waiting signal handlers.
- op_queue<signal_op>* queue_;
- // The number of undelivered signals.
- std::size_t undelivered_;
- // Pointers to adjacent registrations in the registrations_ table.
- registration* next_in_table_;
- registration* prev_in_table_;
- // Link to next registration in the signal set.
- registration* next_in_set_;
- };
- // The implementation type of the signal_set.
- class implementation_type
- {
- public:
- // Default constructor.
- implementation_type()
- : signals_(0)
- {
- }
- private:
- // Only this service will have access to the internal values.
- friend class signal_set_service;
- // The pending signal handlers.
- op_queue<signal_op> queue_;
- // Linked list of registered signals.
- registration* signals_;
- };
- // Constructor.
- BOOST_ASIO_DECL signal_set_service(boost::asio::io_service& io_service);
- // Destructor.
- BOOST_ASIO_DECL ~signal_set_service();
- // Destroy all user-defined handler objects owned by the service.
- BOOST_ASIO_DECL void shutdown_service();
- // Perform fork-related housekeeping.
- BOOST_ASIO_DECL void fork_service(
- boost::asio::io_service::fork_event fork_ev);
- // Construct a new signal_set implementation.
- BOOST_ASIO_DECL void construct(implementation_type& impl);
- // Destroy a signal_set implementation.
- BOOST_ASIO_DECL void destroy(implementation_type& impl);
- // Add a signal to a signal_set.
- BOOST_ASIO_DECL boost::system::error_code add(implementation_type& impl,
- int signal_number, boost::system::error_code& ec);
- // Remove a signal to a signal_set.
- BOOST_ASIO_DECL boost::system::error_code remove(implementation_type& impl,
- int signal_number, boost::system::error_code& ec);
- // Remove all signals from a signal_set.
- BOOST_ASIO_DECL boost::system::error_code clear(implementation_type& impl,
- boost::system::error_code& ec);
- // Cancel all operations associated with the signal set.
- BOOST_ASIO_DECL boost::system::error_code cancel(implementation_type& impl,
- boost::system::error_code& ec);
- // Start an asynchronous operation to wait for a signal to be delivered.
- template <typename Handler>
- void async_wait(implementation_type& impl, Handler handler)
- {
- // Allocate and construct an operation to wrap the handler.
- typedef signal_handler<Handler> op;
- typename op::ptr p = { boost::addressof(handler),
- boost_asio_handler_alloc_helpers::allocate(
- sizeof(op), handler), 0 };
- p.p = new (p.v) op(handler);
- BOOST_ASIO_HANDLER_CREATION((p.p, "signal_set", &impl, "async_wait"));
- start_wait_op(impl, p.p);
- p.v = p.p = 0;
- }
- // Deliver notification that a particular signal occurred.
- BOOST_ASIO_DECL static void deliver_signal(int signal_number);
- private:
- // Helper function to add a service to the global signal state.
- BOOST_ASIO_DECL static void add_service(signal_set_service* service);
- // Helper function to remove a service from the global signal state.
- BOOST_ASIO_DECL static void remove_service(signal_set_service* service);
- // Helper function to create the pipe descriptors.
- BOOST_ASIO_DECL static void open_descriptors();
- // Helper function to close the pipe descriptors.
- BOOST_ASIO_DECL static void close_descriptors();
- // Helper function to start a wait operation.
- BOOST_ASIO_DECL void start_wait_op(implementation_type& impl, signal_op* op);
- // The io_service instance used for dispatching handlers.
- io_service_impl& io_service_;
- #if !defined(BOOST_WINDOWS) && !defined(__CYGWIN__)
- // The type used for registering for pipe reactor notifications.
- class pipe_read_op;
- // The reactor used for waiting for pipe readiness.
- reactor& reactor_;
- // The per-descriptor reactor data used for the pipe.
- reactor::per_descriptor_data reactor_data_;
- #endif // !defined(BOOST_WINDOWS) && !defined(__CYGWIN__)
- // A mapping from signal number to the registered signal sets.
- registration* registrations_[max_signal_number];
- // Pointers to adjacent services in linked list.
- signal_set_service* next_;
- signal_set_service* prev_;
- };
- } // namespace detail
- } // namespace asio
- } // namespace boost
- #include <boost/asio/detail/pop_options.hpp>
- #if defined(BOOST_ASIO_HEADER_ONLY)
- # include <boost/asio/detail/impl/signal_set_service.ipp>
- #endif // defined(BOOST_ASIO_HEADER_ONLY)
- #endif // BOOST_ASIO_DETAIL_SIGNAL_SET_SERVICE_HPP