boost/asio/detail/null_mutex.hpp

   1 //
   2 // null_mutex.hpp
   3 // ~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2008 Christopher M. Kohlhoff (chris at kohlhoff dot com)
   6 //
   7 // Distributed under the Boost Software License, Version 1.0. (See accompanying
   8 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   9 //
  10
  11 #ifndef BOOST_ASIO_DETAIL_NULL_MUTEX_HPP
  12 #define BOOST_ASIO_DETAIL_NULL_MUTEX_HPP
  13
  14 #if defined(_MSC_VER) && (_MSC_VER >= 1200)
  15 # pragma once
  16 #endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
  17
  18 #include <boost/asio/detail/push_options.hpp>
  19
  20 #include <boost/asio/detail/push_options.hpp>
  21 #include <boost/config.hpp>
  22 #include <boost/asio/detail/pop_options.hpp>
  23
  24 #if !defined(BOOST_HAS_THREADS)
  25
  26 #include <boost/asio/detail/noncopyable.hpp>
  27 #include <boost/asio/detail/scoped_lock.hpp>
  28
  29 namespace boost {
  30 namespace asio {
  31 namespace detail {
  32
  33 class null_mutex
  34   : private noncopyable
  35 {
  36 public:
  37   typedef boost::asio::detail::scoped_lock<null_mutex> scoped_lock;
  38
  39   // Constructor.
  40   null_mutex()
  41   {
  42   }
  43
  44   // Destructor.
  45   ~null_mutex()
  46   {
  47   }
  48
  49   // Lock the mutex.
  50   void lock()
  51   {
  52   }
  53
  54   // Unlock the mutex.
  55   void unlock()
  56   {
  57   }
  58 };
  59
  60 } // namespace detail
  61 } // namespace asio
  62 } // namespace boost
  63
  64 #endif // !defined(BOOST_HAS_THREADS)
  65
  66 #include <boost/asio/detail/pop_options.hpp>
  67
  68 #endif // BOOST_ASIO_DETAIL_NULL_MUTEX_HPP