process_mutex.hpp

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/* /////////////////////////////////////////////////////////////////////////
 * File:        winstl/synch/process_mutex.hpp (formerly winstl/process_mutex.hpp; originally winstl_process_mutex.h)
 *
 * Purpose:     Inter-process mutex, based on Windows MUTEX.
 *
 * Created:     15th May 2002
 * Updated:     10th June 2006
 *
 * Home:        http://stlsoft.org/
 *
 * Copyright (c) 2002-2006, 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 winstl/synch/process_mutex.hpp
 *
 * \brief [C++ only] Definition of winstl::process_mutex class.
 *  (\ref group__library__synch "Synchronisation" Library.)
 */

#ifndef WINSTL_INCL_WINSTL_SYNCH_HPP_PROCESS_MUTEX
#define WINSTL_INCL_WINSTL_SYNCH_HPP_PROCESS_MUTEX

#ifndef STLSOFT_DOCUMENTATION_SKIP_SECTION
# define WINSTL_VER_WINSTL_SYNCH_HPP_PROCESS_MUTEX_MAJOR    4
# define WINSTL_VER_WINSTL_SYNCH_HPP_PROCESS_MUTEX_MINOR    0
# define WINSTL_VER_WINSTL_SYNCH_HPP_PROCESS_MUTEX_REVISION 2
# define WINSTL_VER_WINSTL_SYNCH_HPP_PROCESS_MUTEX_EDIT     42
#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 */
#ifndef WINSTL_INCL_WINSTL_SYNCH_HPP_EXCEPTIONS
# include <winstl/synch/exceptions.hpp>
#endif /* !WINSTL_INCL_WINSTL_SYNCH_HPP_EXCEPTIONS */

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

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

// class process_mutex
/** \brief This class acts as an inter-process mutex based on the Win32
 *   mutex kernel object
 *
 * \ingroup group__library__synch
 */
class process_mutex
    : public stlsoft_ns_qual(critical_section)< STLSOFT_CRITICAL_SECTION_IS_RECURSIVE
                                            ,   STLSOFT_CRITICAL_SECTION_IS_TRYABLE
                                            >
    , public stlsoft_ns_qual(synchronisable_object_tag)
{
public:
    typedef process_mutex   class_type;
    typedef HANDLE          handle_type;

/// \name Construction
/// @{
public:
    /// \brief Creates an instance of the mutex
    process_mutex()
        : m_mx(create_mutex_(NULL, false, static_cast<ws_char_a_t const *>(0), m_bCreated))
        , m_bOwnHandle(true)
        , m_bAbandoned(false)
    {}
    /// \brief Conversion constructor
    process_mutex(HANDLE mx, ws_bool_t bTakeOwnership)
        : m_mx(mx)
        , m_bOwnHandle(bTakeOwnership)
        , m_bCreated(false)
        , m_bAbandoned(false)
    {
        WINSTL_ASSERT(NULL != mx);
    }
    /// \brief Creates an instance of the mutex
    ss_explicit_k process_mutex(ws_char_a_t const *name)
        : m_mx(create_mutex_(NULL, false, name, m_bCreated))
        , m_bOwnHandle(true)
        , m_bAbandoned(false)
    {}
    /// \brief Creates an instance of the mutex
    ss_explicit_k process_mutex(ws_char_w_t const *name)
        : m_mx(create_mutex_(NULL, false, name, m_bCreated))
        , m_bOwnHandle(true)
        , m_bAbandoned(false)
    {}
    /// \brief Creates an instance of the mutex
    ss_explicit_k process_mutex(ws_bool_t bInitialOwer)
        : m_mx(create_mutex_(NULL, bInitialOwer, static_cast<ws_char_a_t const *>(0), m_bCreated))
        , m_bOwnHandle(true)
        , m_bAbandoned(false)
    {}
    /// \brief Creates an instance of the mutex
    ss_explicit_k process_mutex(ws_char_a_t const *name, ws_bool_t bInitialOwer)
        : m_mx(create_mutex_(NULL, bInitialOwer, name, m_bCreated))
        , m_bOwnHandle(true)
        , m_bAbandoned(false)
    {}
    /// \brief Creates an instance of the mutex
    ss_explicit_k process_mutex(ws_char_w_t const *name, ws_bool_t bInitialOwer)
        : m_mx(create_mutex_(NULL, bInitialOwer, name, m_bCreated))
        , m_bOwnHandle(true)
        , m_bAbandoned(false)
    {}
    /// \brief Creates an instance of the mutex
    ss_explicit_k process_mutex(ws_char_a_t const *name, ws_bool_t bInitialOwer, LPSECURITY_ATTRIBUTES psa)
        : m_mx(create_mutex_(psa, bInitialOwer, name, m_bCreated))
        , m_bOwnHandle(true)
        , m_bAbandoned(false)
    {}
    /// \brief Creates an instance of the mutex
    ss_explicit_k process_mutex(ws_char_w_t const *name, ws_bool_t bInitialOwer, LPSECURITY_ATTRIBUTES psa)
        : m_mx(create_mutex_(psa, bInitialOwer, name, m_bCreated))
        , m_bOwnHandle(true)
        , m_bAbandoned(false)
    {}

    /// \brief Destroys an instance of the mutex
    ~process_mutex() stlsoft_throw_0()
    {
        if( NULL != m_mx &&
            m_bOwnHandle)
        {
            ::CloseHandle(m_mx);
        }
    }

#if 0
    void close() stlsoft_throw_0()
    {
        if( NULL != m_mx &&
            m_bOwnHandle)
        {
            CloseHandleSetNull(m_mx);
        }
    }
#endif /* 0 */

/// @}

/// \name Operations
/// @{
public:
    /// \brief Acquires a lock on the mutex, pending the thread until the lock is aquired
    void lock()
    {
        WINSTL_ASSERT(NULL != m_mx);

        DWORD   dwRes   =   ::WaitForSingleObject(m_mx, INFINITE);

        if(WAIT_ABANDONED == dwRes)
        {
            m_bAbandoned = true;
        }
        else
        {
            m_bAbandoned = false;

            if(WAIT_OBJECT_0 != dwRes)
            {
#ifdef STLSOFT_CF_EXCEPTION_SUPPORT
                throw synchronisation_exception("mutex wait failed", ::GetLastError());
#endif /* STLSOFT_CF_EXCEPTION_SUPPORT */
            }
        }
    }
    /// \brief Acquires a lock on the mutex, pending the thread until the lock is aquired
    ws_bool_t lock(ws_dword_t wait)
    {
        WINSTL_ASSERT(NULL != m_mx);

        DWORD   dwRes   =   ::WaitForSingleObject(m_mx, wait);

        if(WAIT_ABANDONED == dwRes)
        {
            m_bAbandoned = true;

            return true;
        }
        else
        {
            m_bAbandoned = false;

            if(WAIT_TIMEOUT == dwRes)
            {
                return false;
            }
            else
            {
                if(WAIT_OBJECT_0 != dwRes)
                {
#ifdef STLSOFT_CF_EXCEPTION_SUPPORT