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//
// 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
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