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 //////////////////////////////////////////////////////////////////////////////
 //
 // (C) Copyright Ion Gaztanaga 2005-2012. 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)
 //
 // See http://www.boost.org/libs/interprocess for documentation.
 //
 //////////////////////////////////////////////////////////////////////////////
 
 #ifndef BOOST_INTERPROCESS_NULL_MUTEX_HPP
 #define BOOST_INTERPROCESS_NULL_MUTEX_HPP
 
 #ifndef BOOST_CONFIG_HPP
 #  include <boost/config.hpp>
 #endif
 #
 #if defined(BOOST_HAS_PRAGMA_ONCE)
 #  pragma once
 #endif
 
 #include <boost/interprocess/detail/config_begin.hpp>
 #include <boost/interprocess/detail/workaround.hpp>
 
 
 //!\file
 //!Describes null_mutex classes
 
 namespace boost {
 namespace interprocess {
 
 //!Implements a mutex that simulates a mutex without doing any operation and
 //!simulates a successful operation.
 class null_mutex
 {
    #if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
    null_mutex(const null_mutex&);
    null_mutex &operator= (const null_mutex&);
    #endif   //#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
    public:
 
    //!Constructor.
    //!Empty.
    null_mutex() BOOST_NOEXCEPT {}
 
    //!Destructor.
    //!Empty.
    ~null_mutex(){}
 
    //!Simulates a mutex lock() operation. Empty function.
    void lock(){}
 
    //!Simulates a mutex try_lock() operation.
    //!Equivalent to "return true;"
    bool try_lock()
    {  return true;   }
 
    //!Simulates a mutex timed_lock() operation.
    //!Equivalent to "return true;"
    template<class TimePoint>
    bool timed_lock(const TimePoint &)
    {  return true;   }
 
    //!Same as `timed_lock`, but this function is modeled after the
    //!standard library interface.
    template<class TimePoint>
    bool try_lock_until(const TimePoint &)
    {  return true;  }
 
    //!Same as `timed_lock`, but this function is modeled after the
    //!standard library interface.
    template<class Duration> 
    bool try_lock_for(const Duration &)
    {  return true; }
 
    //!Simulates a mutex unlock() operation.
    //!Empty function.
    void unlock(){}
 
    //!Simulates a mutex lock_sharable() operation.
    //!Empty function.
    void lock_sharable(){}
 
    //!Same as `lock_sharable` but with a std-compatible interface
    //! 
    void lock_shared()
    {  this->lock_sharable();  }
 
    //!Simulates a mutex try_lock_sharable() operation.
    //!Equivalent to "return true;"
    bool try_lock_sharable()
    {  return true;   }
 
    //!Same as `try_lock_sharable` but with a std-compatible interface
    //! 
    bool try_lock_shared()
    {  return this->try_lock_sharable();  }
 
    //!Simulates a mutex timed_lock_sharable() operation.
    //!Equivalent to "return true;"
    template<class TimePoint>
    bool timed_lock_sharable(const TimePoint &)
    {  return true;   }
 
    //!Simulates a mutex unlock_sharable() operation.
    //!Empty function.
    void unlock_sharable(){}
 
    //!Same as `unlock_sharable` but with a std-compatible interface
    //! 
    void unlock_shared()
    {  this->unlock_sharable();  }
 
    //!Simulates a mutex lock_upgradable() operation.
    //!Empty function.
    void lock_upgradable(){}
 
    //!Simulates a mutex try_lock_upgradable() operation.
    //!Equivalent to "return true;"
    bool try_lock_upgradable()
    {  return true;   }
 
    //!Simulates a mutex timed_lock_upgradable() operation.
    //!Equivalent to "return true;"
    template<class TimePoint>
    bool timed_lock_upgradable(const TimePoint &)
    {  return true;   }
 
    //!Simulates a mutex unlock_upgradable() operation.
    //!Empty function.
    void unlock_upgradable(){}
 
    //!Simulates unlock_and_lock_upgradable().
    //!Empty function.
    void unlock_and_lock_upgradable(){}
 
    //!Simulates unlock_and_lock_sharable().
    //!Empty function.
    void unlock_and_lock_sharable(){}
 
    //!Simulates unlock_upgradable_and_lock_sharable().
    //!Empty function.
    void unlock_upgradable_and_lock_sharable(){}
 
    //Promotions
 
    //!Simulates unlock_upgradable_and_lock().
    //!Empty function.
    void unlock_upgradable_and_lock(){}
 
    //!Simulates try_unlock_upgradable_and_lock().
    //!Equivalent to "return true;"
    bool try_unlock_upgradable_and_lock()
    {  return true;   }
 
    //!Simulates timed_unlock_upgradable_and_lock().
    //!Equivalent to "return true;"
    template<class TimePoint>
    bool timed_unlock_upgradable_and_lock(const TimePoint &)
    {  return true;   }
 
    //!Simulates try_unlock_sharable_and_lock().
    //!Equivalent to "return true;"
    bool try_unlock_sharable_and_lock()
    {  return true;   }
 
    //!Simulates try_unlock_sharable_and_lock_upgradable().
    //!Equivalent to "return true;"
    bool try_unlock_sharable_and_lock_upgradable()
    {  return true;   }
 };
 
 }  //namespace interprocess {
 }  //namespace boost {
 
 #include <boost/interprocess/detail/config_end.hpp>
 
 #endif   //BOOST_INTERPROCESS_NULL_MUTEX_HPP

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