/* /////////////////////////////////////////////////////////////////////////
 * File:        winstl/synch/thread_mutex.hpp
 *
 * Purpose:     Intra-process mutex, based on Windows CRITICAL_SECTION.
 *
 * Created:     17th December 1996
 * Updated:     10th August 2009
 *
 * Home:        http://stlsoft.org/
 *
 * Copyright (c) 1996-2009, 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 winstl/synch/thread_mutex.hpp
 *
 * \brief [C++ only] Definition of winstl::thread_mutex class
 *   (\ref group__library__synch "Synchronisation" Library).
 */

#ifndef WINSTL_INCL_WINSTL_SYNCH_HPP_THREAD_MUTEX
#define WINSTL_INCL_WINSTL_SYNCH_HPP_THREAD_MUTEX

#ifndef STLSOFT_DOCUMENTATION_SKIP_SECTION
# define WINSTL_VER_WINSTL_SYNCH_HPP_THREAD_MUTEX_MAJOR     4
# define WINSTL_VER_WINSTL_SYNCH_HPP_THREAD_MUTEX_MINOR     0
# define WINSTL_VER_WINSTL_SYNCH_HPP_THREAD_MUTEX_REVISION  1
# define WINSTL_VER_WINSTL_SYNCH_HPP_THREAD_MUTEX_EDIT      52
#endif /* !STLSOFT_DOCUMENTATION_SKIP_SECTION */

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

#ifndef WINSTL_INCL_WINSTL_H_WINSTL
# include <winstl/winstl.h>
#endif /* !WINSTL_INCL_WINSTL_H_WINSTL */
#ifndef STLSOFT_INCL_STLSOFT_SYNCH_HPP_CONCEPTS
# include <stlsoft/synch/concepts.hpp>
#endif /* !STLSOFT_INCL_STLSOFT_SYNCH_HPP_CONCEPTS */

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

#ifndef _WINSTL_NO_NAMESPACE
# if defined(_STLSOFT_NO_NAMESPACE) || \
     defined(STLSOFT_DOCUMENTATION_SKIP_SECTION)
/* There is no stlsoft namespace, so must define ::winstl */
namespace winstl
{
# else
/* Define stlsoft::winstl_project */

namespace stlsoft
{

namespace winstl_project
{

# endif /* _STLSOFT_NO_NAMESPACE */
#endif /* !_WINSTL_NO_NAMESPACE */

/* /////////////////////////////////////////////////////////////////////////
 * Spin-count support
 */

#ifdef __WINSTL_THREAD_MUTEX_SPIN_COUNT_SUPPORT
# undef __WINSTL_THREAD_MUTEX_SPIN_COUNT_SUPPORT
#endif /* __WINSTL_THREAD_MUTEX_SPIN_COUNT_SUPPORT */

#ifdef __WINSTL_THREAD_MUTEX_TRY_LOCK_SUPPORT
# undef __WINSTL_THREAD_MUTEX_TRY_LOCK_SUPPORT
#endif /* __WINSTL_THREAD_MUTEX_TRY_LOCK_SUPPORT */

#if defined(_WIN32_WINNT) && \
    _WIN32_WINNT >= 0x0403
# define __WINSTL_THREAD_MUTEX_SPIN_COUNT_SUPPORT
#endif /* _WIN32_WINNT >= 0x0403 */

#if defined(_WIN32_WINNT) && \
    _WIN32_WINNT >= 0x0400
# define __WINSTL_THREAD_MUTEX_TRY_LOCK_SUPPORT
#endif /* _WIN32_WINNT >= 0x0400 */

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

// class thread_mutex
/** \brief This class provides an implementation of the mutex model based on the Win32 CRITICAL_SECTION
 *
 * \ingroup group__library__synch
 */
class thread_mutex
    : public stlsoft_ns_qual(critical_section)< STLSOFT_CRITICAL_SECTION_IS_RECURSIVE
#ifdef __WINSTL_THREAD_MUTEX_TRY_LOCK_SUPPORT
                                            ,   STLSOFT_CRITICAL_SECTION_IS_TRYABLE
#else /* ? __WINSTL_THREAD_MUTEX_TRY_LOCK_SUPPORT */
                                            ,   STLSOFT_CRITICAL_SECTION_ISNOT_TRYABLE
#endif /* __WINSTL_THREAD_MUTEX_TRY_LOCK_SUPPORT */
                                            >
{
public:
    /// This type
    typedef thread_mutex class_type;

// Construction
public:
    /// Creates an instance of the mutex
    thread_mutex() stlsoft_throw_0()
    {
        ::InitializeCriticalSection(&m_cs);
    }
#if defined(__WINSTL_THREAD_MUTEX_SPIN_COUNT_SUPPORT)
    /// Creates an instance of the mutex and sets its spin count
    ///
    /// \param spinCount The new spin count for the mutex
    /// \note Only available with Windows NT 4 SP3 and later
    thread_mutex(ws_dword_t spinCount) stlsoft_throw_0()
    {
        ::InitializeCriticalSectionAndSpinCount(&m_cs, spinCount);
    }
#endif /* __WINSTL_THREAD_MUTEX_SPIN_COUNT_SUPPORT */
    /// Destroys an instance of the mutex
    ~thread_mutex() stlsoft_throw_0()
    {
        ::DeleteCriticalSection(&m_cs);
    }

// Operations
public:
    /// Acquires a lock on the mutex, pending the thread until the lock is aquired
    void lock() stlsoft_throw_0()
    {
        ::EnterCriticalSection(&m_cs);
    }
#if defined(__WINSTL_THREAD_MUTEX_TRY_LOCK_SUPPORT)
    /// Attempts to lock the mutex
    ///
    /// \return <b>true</b> if the mutex was aquired, or <b>false</b> if not
    /// \note Only available with Windows NT 4 and later
    bool try_lock()
    {
        return ::TryEnterCriticalSection(&m_cs) != FALSE;
    }
#endif /* __WINSTL_THREAD_MUTEX_TRY_LOCK_SUPPORT */
    /// Releases an aquired lock on the mutex
    void unlock() stlsoft_throw_0()
    {
        ::LeaveCriticalSection(&m_cs);
    }

#if defined(__WINSTL_THREAD_MUTEX_SPIN_COUNT_SUPPORT)
    /// Sets the spin count for the mutex
    ///
    /// \param spinCount The new spin count for the mutex
    /// \return The previous spin count associated with the mutex
    /// \note Only available with Windows NT 4 SP3 and later
    ws_dword_t set_spin_count(ws_dword_t spinCount) stlsoft_throw_0()
    {
        return ::SetCriticalSectionSpinCount(&m_cs, spinCount);
    }
#endif /* __WINSTL_THREAD_MUTEX_SPIN_COUNT_SUPPORT */

// Members
private:
    CRITICAL_SECTION    m_cs;   // critical section

// Not to be implemented
private:
    thread_mutex(class_type const& rhs);
    thread_mutex& operator =(class_type const& rhs);
};

/* /////////////////////////////////////////////////////////////////////////
 * Control shims
 */

#ifndef _WINSTL_NO_NAMESPACE
# if defined(_STLSOFT_NO_NAMESPACE) || \
     defined(STLSOFT_DOCUMENTATION_SKIP_SECTION)
} // namespace winstl
# else
} // namespace winstl_project
# endif /* _STLSOFT_NO_NAMESPACE */
#endif /* !_WINSTL_NO_NAMESPACE */

/** \brief This \ref group__concept__shims "control shim" aquires a lock on the given mutex
 *
 * \ingroup group__concept__shim__synchronisation_control
 *
 * \param mx The mutex on which to aquire the lock.
 */
inline void lock_instance(winstl_ns_qual(thread_mutex) &mx)
{
    mx.lock();
}

/** \brief This \ref group__concept__shims "control shim" releases a lock on the given mutex
 *
 * \ingroup group__concept__shim__synchronisation_control
 *
 * \param mx The mutex on which to release the lock
 */
inline void unlock_instance(winstl_ns_qual(thread_mutex) &mx)
{
    mx.unlock();
}


#ifndef _WINSTL_NO_NAMESPACE
# if defined(_STLSOFT_NO_NAMESPACE) || \
     defined(STLSOFT_DOCUMENTATION_SKIP_SECTION)
namespace winstl {
# else
namespace winstl_project {
#  if defined(STLSOFT_COMPILER_IS_BORLAND)
using ::stlsoft::lock_instance;
using ::stlsoft::unlock_instance;
#  endif /* compiler */
# endif /* _STLSOFT_NO_NAMESPACE */
#endif /* !_WINSTL_NO_NAMESPACE */

/* /////////////////////////////////////////////////////////////////////////
 * lock_traits
 */

// class lock_traits
/** \brief Traits for the thread_mutex class
 *
 * \ingroup group__library__synch
 */
struct thread_mutex_lock_traits
{
public:
    /// The lockable type
    typedef thread_mutex                lock_type;
    /// This type
    typedef thread_mutex_lock_traits    class_type;

// Operations
public:
    /// Lock the given thread_mutex instance
    static void lock(thread_mutex &c)
    {
        lock_instance(c);
    }

    /// Unlock the given thread_mutex instance
    static void unlock(thread_mutex &c)
    {
        unlock_instance(c);
    }
};

////////////////////////////////////////////////////////////////////////////
// Unit-testing

#ifdef STLSOFT_UNITTEST
# include "./unittest/thread_mutex_unittest_.h"
#endif /* STLSOFT_UNITTEST */

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

#ifndef _WINSTL_NO_NAMESPACE
# if defined(_STLSOFT_NO_NAMESPACE) || \
     defined(STLSOFT_DOCUMENTATION_SKIP_SECTION)
} // namespace winstl
# else
} // namespace winstl_project
} // namespace stlsoft
# endif /* _STLSOFT_NO_NAMESPACE */
#endif /* !_WINSTL_NO_NAMESPACE */

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

#endif /* !WINSTL_INCL_WINSTL_SYNCH_HPP_THREAD_MUTEX */

/* ///////////////////////////// end of file //////////////////////////// */