process_mutex.hpp

新版本TR1的stl

/* /////////////////////////////////////////////////////////////////////////
 * File:        unixstl/synch/process_mutex.hpp
 *
 * Purpose:     Intra-process mutext, based on PTHREADS.
 *
 * Created:     15th May 2002
 * Updated:     8th April 2007
 *
 * Home:        http://stlsoft.org/
 *
 * Copyright (c) 2002-2007, 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 unixstl/synch/process_mutex.hpp
 *
 * \brief [C++ only] Definition of the unixstl::process_mutex class
 *   (\ref group__library__synch "Synchronisation" Library).
 */

#ifndef UNIXSTL_INCL_UNIXSTL_SYNCH_HPP_PROCESS_MUTEX
#define UNIXSTL_INCL_UNIXSTL_SYNCH_HPP_PROCESS_MUTEX

#ifndef STLSOFT_DOCUMENTATION_SKIP_SECTION
# define UNIXSTL_VER_UNIXSTL_SYNCH_HPP_PROCESS_MUTEX_MAJOR      4
# define UNIXSTL_VER_UNIXSTL_SYNCH_HPP_PROCESS_MUTEX_MINOR      6
# define UNIXSTL_VER_UNIXSTL_SYNCH_HPP_PROCESS_MUTEX_REVISION   1
# define UNIXSTL_VER_UNIXSTL_SYNCH_HPP_PROCESS_MUTEX_EDIT       68
#endif /* !STLSOFT_DOCUMENTATION_SKIP_SECTION */

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

#ifndef UNIXSTL_INCL_UNIXSTL_H_UNIXSTL
# include <unixstl/unixstl.h>
#endif /* !UNIXSTL_INCL_UNIXSTL_H_UNIXSTL */
#ifndef UNIXSTL_INCL_UNIXSTL_SYNCH_UTIL_H_FEATURES
# include <unixstl/synch/util/features.h>
#endif /* !UNIXSTL_INCL_UNIXSTL_SYNCH_UTIL_H_FEATURES */
#ifndef UNIXSTL_USING_PTHREADS
# error unixstl/synch/process_mutex.hpp cannot be included in non-multithreaded compilation. _REENTRANT and/or _POSIX_THREADS must be defined
#endif /* !UNIXSTL_USING_PTHREADS */

#ifdef STLSOFT_CF_EXCEPTION_SUPPORT
# ifndef UNIXSTL_INCL_UNIXSTL_SYNCH_ERROR_HPP_EXCEPTIONS
#  include <unixstl/synch/error/exceptions.hpp>
# endif /* !UNIXSTL_INCL_UNIXSTL_SYNCH_ERROR_HPP_EXCEPTIONS */
#endif /* STLSOFT_CF_EXCEPTION_SUPPORT */
#ifndef STLSOFT_INCL_STLSOFT_SMARTPTR_HPP_SCOPED_HANDLE
# include <stlsoft/smartptr/scoped_handle.hpp>
#endif /* !STLSOFT_INCL_STLSOFT_SMARTPTR_HPP_SCOPED_HANDLE */
#ifndef STLSOFT_INCL_STLSOFT_SYNCH_HPP_CONCEPTS
# include <stlsoft/synch/concepts.hpp>
#endif /* !STLSOFT_INCL_STLSOFT_SYNCH_HPP_CONCEPTS */
#include <errno.h>
#include <pthread.h>

#ifdef STLSOFT_UNITTEST
# include <stdio.h>
#endif /* STLSOFT_UNITTEST */

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

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

namespace stlsoft
{

namespace unixstl_project
{

# endif /* _STLSOFT_NO_NAMESPACE */
#endif /* !_UNIXSTL_NO_NAMESPACE */

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

// class process_mutex
/** \brief This class provides an implementation of the mutex model based on
 *   the PTHREADS pthread_mutex_t.
 *
 * \ingroup group__library__synch
 */
class process_mutex
    : public stlsoft_ns_qual(critical_section)< STLSOFT_CRITICAL_SECTION_ISNOT_RECURSIVE
                                            ,   STLSOFT_CRITICAL_SECTION_IS_TRYABLE
                                            >
{
/// \name Member Types
/// @{
public:
    typedef process_mutex       class_type;
    typedef us_bool_t           bool_type;

	typedef pthread_mutex_t*	resource_type;
/// @}

/// \name Construction
/// @{
public:
    /// \brief Creates an instance of the mutex
    ///
    /// \note This creates a recursive mutex. Use the other constructor(s) to
    ///  obtain a non-recursive mutex.
    ///
    /// \note On systems that support shared mutexes, this will be not shared. Use
    ///  the other constructor to obtain a shared mutex
    process_mutex()
        : m_mx(&m_mx_)
#if defined(_POSIX_THREAD_PROCESS_SHARED)
        , m_error(create_(&m_mx_, PTHREAD_PROCESS_PRIVATE, true))
#else /* ? _POSIX_THREAD_PROCESS_SHARED */
        , m_error(create_(&m_mx_, 0, true))
#endif /* _POSIX_THREAD_PROCESS_SHARED */
        , m_bOwnHandle(true)
    {}

    /// \brief Conversion constructor
    ///
    /// \param mx The raw mutex object handle that this instance will use
    /// \param bTakeOwnership If true, the handle is closed when this instance is destroyed
    process_mutex(pthread_mutex_t* mx, bool_type bTakeOwnership)
        : m_mx(mx)
        , m_error(0)
        , m_bOwnHandle(bTakeOwnership)
    {
        UNIXSTL_ASSERT(NULL != mx);
    }

    /// \brief Creates an instance of the mutex
    ///
    /// \note On systems that support shared mutexes, this will be not shared. Use
    /// the two-parameter constructor to obtain a shared mutex
    ss_explicit_k process_mutex(bool_type bRecursive)
        : m_mx(&m_mx_)
#if defined(_POSIX_THREAD_PROCESS_SHARED)
        , m_error(create_(&m_mx_, PTHREAD_PROCESS_PRIVATE, bRecursive))
#else /* ? _POSIX_THREAD_PROCESS_SHARED */
        , m_error(create_(&m_mx_, 0, bRecursive))
#endif /* _POSIX_THREAD_PROCESS_SHARED */
        , m_bOwnHandle(true)
    {}
#if defined(_POSIX_THREAD_PROCESS_SHARED)
    /// \brief Creates an instance of the mutex, optionally recursive and/or shared between processes
    ///
    /// \param pshared A value from the PTHREADS_PROCESS_* group that determines the sharing
    ///  characteristics of the mutex.
    /// \param bRecursive A boolean value denoting whether the mutex should be recursive or not
    process_mutex(int pshared, bool_type bRecursive)
        : m_mx(&m_mx_)
        , m_error(create_(&m_mx_, pshared, bRecursive))
        , m_bOwnHandle(true)
    {}
#endif /* _POSIX_THREAD_PROCESS_SHARED */
    /// \brief Destroys an instance of the mutex
    ~process_mutex() stlsoft_throw_0()
    {
        if( 0 == m_error &&
            m_bOwnHandle)
        {
            ::pthread_mutex_destroy(m_mx);
        }
    }
/// @}

/// \name Operations
/// @{
public:
    /// \brief Acquires a lock on the mutex, pending the thread until the lock is aquired
    ///
    /// \exception unixstl::synchronisation_exception When compiling with exception support, this will throw
    /// unixstl::synchronisation_exception if the lock cannot be acquired. When
    /// compiling absent exception support, failure to acquire the lock
    /// will be reflected in a non-zero return from get_error().
    void lock()
    {
        m_error = ::pthread_mutex_lock(m_mx);

#ifdef STLSOFT_CF_EXCEPTION_SUPPORT
        if(0 != m_error)
        {
            STLSOFT_THROW_X(synchronisation_exception("Mutex lock failed", m_error));
        }
#endif /* STLSOFT_CF_EXCEPTION_SUPPORT */
    }
    /// \brief Attempts to lock the mutex
    ///
    /// \return <b>true</b> if the mutex was aquired, or <b>false</b> if not.
    ///
    /// \exception unixstl::synchronisation_exception When compiling with exception support, this will throw
    /// unixstl::synchronisation_exception if the lock cannot be acquired for a reason
    /// other than a timeout (<code>EBUSY</code>). When compiling absent
    /// exception support, failure to acquire the lock (for any other
    /// reason) will be reflected in a non-zero return from get_error().
    bool try_lock()
    {
        m_error = ::pthread_mutex_trylock(m_mx);

        if(0 == m_error)
        {
            return true;
        }
        else