lock_scope.hpp

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/* /////////////////////////////////////////////////////////////////////////
 * File:        stlsoft/synch/lock_scope.hpp (originally MLLock.h, ::SynesisStd)
 *
 * Purpose:     Synchronisation object lock scoping class.
 *
 * Created:     1st October 1994
 * Updated:     14th June 2006
 *
 * Home:        http://stlsoft.org/
 *
 * Copyright (c) 1994-2006, Matthew Wilson and Synesis Software
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice, this
 *   list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 * - Neither the name(s) of Matthew Wilson and Synesis Software nor the names of
 *   any contributors may be used to endorse or promote products derived from
 *   this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * ////////////////////////////////////////////////////////////////////// */


/** \file stlsoft/synch/lock_scope.hpp
 *
 * \brief [C++ only] Definition of the stlsoft::lock_scope class template.
 *  (\ref group__library__synch "Synchronisation" Library.)
 */

#ifndef STLSOFT_INCL_STLSOFT_SYNCH_HPP_LOCK_SCOPE
#define STLSOFT_INCL_STLSOFT_SYNCH_HPP_LOCK_SCOPE

#ifndef STLSOFT_DOCUMENTATION_SKIP_SECTION
# define STLSOFT_VER_STLSOFT_SYNCH_HPP_LOCK_SCOPE_MAJOR     6
# define STLSOFT_VER_STLSOFT_SYNCH_HPP_LOCK_SCOPE_MINOR     0
# define STLSOFT_VER_STLSOFT_SYNCH_HPP_LOCK_SCOPE_REVISION  1
# define STLSOFT_VER_STLSOFT_SYNCH_HPP_LOCK_SCOPE_EDIT      106
#endif /* !STLSOFT_DOCUMENTATION_SKIP_SECTION */

/* /////////////////////////////////////////////////////////////////////////
 * Includes
 */

#ifndef STLSOFT_INCL_STLSOFT_H_STLSOFT
# include <stlsoft/stlsoft.h>
#endif /* !STLSOFT_INCL_STLSOFT_H_STLSOFT */

/* /////////////////////////////////////////////////////////////////////////
 * Namespace
 */

#ifndef _STLSOFT_NO_NAMESPACE
namespace stlsoft
{
#endif /* _STLSOFT_NO_NAMESPACE */

/* /////////////////////////////////////////////////////////////////////////
 * Classes
 */

// class lock_traits

/** \brief Traits class for lockable objects
 *
 * \ingroup group__library__synch
 *
 * \param L The lockable class
 */
template<ss_typename_param_k L>
struct lock_traits
{
/// \name Member Types
/// @{
public:
    /// \brief The lockable type
    typedef L               lock_type;
    /// \brief The current parameterisation of this type
    typedef lock_traits<L>  class_type;
/// @}

/// \name Operations
/// @{
public:
    /// \brief Locks the given lockable instance
    static void lock(lock_type &c)
    {
        lock_instance(c);
    }

    /// \brief Unlocks the given lockable instance
    static void unlock(lock_type &c)
    {
        unlock_instance(c);
    }
/// @}
};

// class lock_invert_traits

/** \brief Traits class for inverting the lock status of lockable objects
 *
 * \ingroup group__library__synch
 *
 * \param L The lockable class
 */
template<ss_typename_param_k L>
struct lock_invert_traits
{
/// \name Member Types
/// @{
public:
    /// \brief The lockable type
    typedef L                       lock_type;
    /// \brief The current parameterisation of this type
    typedef lock_invert_traits<L>   class_type;
/// @}

/// \name Operations
/// @{
public:
    /// \brief Unlocks the given lockable instance
    static void lock(lock_type &c)
    {
        unlock_instance(c);
    }

    /// \brief Locks the given lockable instance
    static void unlock(lock_type &c)
    {
        lock_instance(c);
    }
/// @}
};

// class lock_traits_inverter

/** \brief Traits inverter class for inverting the lock behaviour of lockable traits types
 *
 * \ingroup group__library__synch
 *
 * \param L The traits class
 */
template<ss_typename_param_k T>
struct lock_traits_inverter
{
/// \name Member Types
/// @{
public:
    /// \brief The traits type
    typedef T                                           traits_type;
    /// \brief The lockable type
    typedef ss_typename_type_k traits_type::lock_type   lock_type;
    /// \brief The current parameterisation of this type
    typedef lock_traits_inverter<T>                     class_type;
/// @}

/// \name Operations
/// @{
public:
    /// \brief Unlocks the given lockable instance
    static void lock(lock_type &c)
    {
        traits_type::unlock(c);
    }

    /// \brief Locks the given lockable instance
    static void unlock(lock_type &c)
    {
        traits_type::lock(c);
    }
/// @}
};

// class lock_scope

/**\brief This class scopes the lock status of a lockable type
 *
 * \ingroup group__library__synch
 *
 * \param L The lockable type, e.g. stlsoft::null_mutex
 * \param T The lock traits. On translators that support default template arguments this defaults to lock_traits<L>
 */
template<   ss_typename_param_k L
#ifdef STLSOFT_CF_TEMPLATE_CLASS_DEFAULT_CLASS_ARGUMENT_SUPPORT
        ,   ss_typename_param_k T = lock_traits<L>
#else /* ? STLSOFT_CF_TEMPLATE_CLASS_DEFAULT_CLASS_ARGUMENT_SUPPORT */
        ,   ss_typename_param_k T
#endif /* STLSOFT_CF_TEMPLATE_CLASS_DEFAULT_CLASS_ARGUMENT_SUPPORT */
        >
class lock_scope
{
/// \name Member Types
/// @{
public:
    /// \brief The lockable type
    typedef L                       lock_type;
    /// \brief The traits type
    typedef T                       traits_type;
    /// \brief The current parameterisation of this type
    typedef lock_scope<L, T>        class_type;
/// @}

/// \name Construction
/// @{
public:
    /// \brief Locks the lockable instance
    lock_scope(lock_type &l)
        : m_l(l)
    {
        traits_type::lock(m_l);
    }
    /// \brief Unlocks the lockable instance
    ~lock_scope() stlsoft_throw_0()
    {
        traits_type::unlock(m_l);
    }
/// @}

/// \name Members
/// @{
private:
    lock_type   &m_l;
/// @}

/// \name Not to be implemented
/// @{
private:
    lock_scope(class_type const &rhs);
    lock_scope &operator =(class_type const &rhs);
/// @}
};

/* ////////////////////////////////////////////////////////////////////// */

#ifndef _STLSOFT_NO_NAMESPACE
} // namespace stlsoft
#endif /* _STLSOFT_NO_NAMESPACE */

/* ////////////////////////////////////////////////////////////////////// */

#endif /* !STLSOFT_INCL_STLSOFT_SYNCH_HPP_LOCK_SCOPE */

/* ////////////////////////////////////////////////////////////////////// */