// | |
// detail/strand_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_STRAND_SERVICE_HPP | |
#define BOOST_ASIO_DETAIL_STRAND_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 <boost/scoped_ptr.hpp> | |
#include <boost/asio/io_service.hpp> | |
#include <boost/asio/detail/mutex.hpp> | |
#include <boost/asio/detail/op_queue.hpp> | |
#include <boost/asio/detail/operation.hpp> | |
#include <boost/asio/detail/push_options.hpp> | |
namespace boost { | |
namespace asio { | |
namespace detail { | |
// Default service implementation for a strand. | |
class strand_service | |
: public boost::asio::detail::service_base<strand_service> | |
{ | |
private: | |
// Helper class to re-post the strand on exit. | |
struct on_do_complete_exit; | |
// Helper class to re-post the strand on exit. | |
struct on_dispatch_exit; | |
public: | |
// The underlying implementation of a strand. | |
class strand_impl | |
: public operation | |
{ | |
public: | |
strand_impl(); | |
private: | |
// Only this service will have access to the internal values. | |
friend class strand_service; | |
friend struct on_do_complete_exit; | |
friend struct on_dispatch_exit; | |
// Mutex to protect access to internal data. | |
boost::asio::detail::mutex mutex_; | |
// The count of handlers in the strand, including the upcall (if any). | |
std::size_t count_; | |
// The handlers waiting on the strand. | |
op_queue<operation> queue_; | |
}; | |
typedef strand_impl* implementation_type; | |
// Construct a new strand service for the specified io_service. | |
BOOST_ASIO_DECL explicit strand_service(boost::asio::io_service& io_service); | |
// Destroy all user-defined handler objects owned by the service. | |
BOOST_ASIO_DECL void shutdown_service(); | |
// Construct a new strand implementation. | |
BOOST_ASIO_DECL void construct(implementation_type& impl); | |
// Destroy a strand implementation. | |
void destroy(implementation_type& impl); | |
// Request the io_service to invoke the given handler. | |
template <typename Handler> | |
void dispatch(implementation_type& impl, Handler handler); | |
// Request the io_service to invoke the given handler and return immediately. | |
template <typename Handler> | |
void post(implementation_type& impl, Handler handler); | |
private: | |
BOOST_ASIO_DECL static void do_complete(io_service_impl* owner, | |
operation* base, boost::system::error_code ec, | |
std::size_t bytes_transferred); | |
// The io_service implementation used to post completions. | |
io_service_impl& io_service_; | |
// Mutex to protect access to the array of implementations. | |
boost::asio::detail::mutex mutex_; | |
// Number of implementations shared between all strand objects. | |
enum { num_implementations = 193 }; | |
// The head of a linked list of all implementations. | |
boost::scoped_ptr<strand_impl> implementations_[num_implementations]; | |
// Extra value used when hashing to prevent recycled memory locations from | |
// getting the same strand implementation. | |
std::size_t salt_; | |
}; | |
} // namespace detail | |
} // namespace asio | |
} // namespace boost | |
#include <boost/asio/detail/pop_options.hpp> | |
#include <boost/asio/detail/impl/strand_service.hpp> | |
#if defined(BOOST_ASIO_HEADER_ONLY) | |
# include <boost/asio/detail/impl/strand_service.ipp> | |
#endif // defined(BOOST_ASIO_HEADER_ONLY) | |
#endif // BOOST_ASIO_DETAIL_STRAND_SERVICE_HPP |