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/*
* Copyright (c) 2011, Andrew Sorensen
*
* All rights reserved.
*
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. 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 of the authors nor other 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 DISCLEXTD. 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.
*
*/

#include <iostream>
#include <stdlib.h>
#include "EXTMutex.h"
#include <cstring>


#define _EXTMUTEX_DEBUG_
#define EXT_MUTEX_RECURSIVE 0

namespace extemp
{
    EXTMutex::EXTMutex(std::string _name) :
initialised(false),
name(_name)
    {
    }
    
    EXTMutex::~EXTMutex()
    {
        destroy();
    }
    

    int EXTMutex::init()
    {

#ifdef EXT_BOOST // START BOOST
        int result = 0;
#else // START POSIX
        pthread_mutexattr_t pthread_mutex_attr;
pthread_mutexattr_init(&pthread_mutex_attr);
#ifdef _EXTMUTEX_DEBUG_
        pthread_mutexattr_settype(&pthread_mutex_attr, PTHREAD_MUTEX_ERRORCHECK);
#else
        pthread_mutexattr_settype(&pthread_mutex_attr, PTHREAD_MUTEX_NORMAL);
#endif

#if EXT_MUTEX_RECURSIVE
pthread_mutexattr_settype(&pthread_mutex_attr, PTHREAD_MUTEX_RECURSIVE);
#endif
int result = pthread_mutex_init(&pthread_mutex, &pthread_mutex_attr);
#endif // END POSIX

        initialised = ! result;

#ifdef _EXTMUTEX_DEBUG_
        if (result)
        {
            std::cerr << "Error initialising mutex: " << name << " err: " << result << std::endl;
        }
#endif
        return result;
    }

    
    void EXTMutex::destroy()
    {
        int result = 0;
        
        if (initialised)
        {
            initialised = false;
#ifdef EXT_BOOST
            result = 0;
#else
            result = pthread_mutex_destroy(&pthread_mutex);
#endif
        }
#ifdef _EXTMUTEX_DEBUG_
        if (result)
        {
            std::cerr << "Error destroying mutex: " << name << " err: " << result << std::endl;
        }
#endif
    }


    bool EXTMutex::isOwnedByCurrentThread()
    {
#ifdef EXT_BOOST
return false;
#else
return pthread_equal(pthread_self(), owner);
#endif

    }

#ifdef EXT_BOOST
int EXTMutex::lock()
{
try{
bmutex.lock();
return true;
}catch(std::exception& e){
std::cout << "Problem locking mutex: " << name << " " << e.what() << std::endl;
return false;
}
}

    int EXTMutex::unlock()
    {

      try{
bmutex.unlock();
return 0;
      }catch(std::exception& e){
std::cout << "Problem unlocking mutex: " << name << " " << e.what() << std::endl;
return 0;
      }
    }
#elif EXT_MUTEX_RECURSIVE
    int EXTMutex::unlock()
    {
int result = pthread_mutex_unlock(&pthread_mutex);
#ifdef _EXTMUTEX_DEBUG_
        if (result)
        {
            std::cerr << "Error unlocking mutex: " << name << " err: " << result << std::endl;
        }
#endif
return result;
    }

    int EXTMutex::lock()
    {
int result = pthread_mutex_lock(&pthread_mutex);
#ifdef _EXTMUTEX_DEBUG_
        if (result)
        {
            std::cerr << "Error locking mutex: " << name << " err: " << result << std::endl;
        }
#endif
return true;
    }
#else
    int EXTMutex::lock()
    {
pthread_t current = pthread_self();
if(!pthread_equal(current,owner)) {
int result = pthread_mutex_lock(&pthread_mutex);
if(result==0) owner = current;
#ifdef _EXTMUTEX_DEBUG_
if (result)
{
std::cerr << "Error locking mutex: " << name << " err: " << result << std::endl;
}
#endif
return true;
}else{
return false;
}
    }

    int EXTMutex::unlock()
    {
if(pthread_equal(pthread_self(),owner))
{
owner = 0;
int result = pthread_mutex_unlock(&pthread_mutex);
#ifdef _EXTMUTEX_DEBUG_
if (result)
{
std::cerr << "Error unlocking mutex: " << name << " err: " << result << std::endl;
}
#endif
return result;
}else{
std::cerr << "Error attempting to unlock a mutex from a thread which does not own it!: " << name << std::endl << std::flush;
std::cerr << "Caller(" << pthread_self() << ") Owner(" << owner << ")" << " " << this << std::endl << std::flush;
std::cerr << "Either track this down or change EXTMutex to be reursive! (i.e. set EXT_MUTEX_RECURSIVE=1)" << std::endl << std::flush;
exit(1);
}
    }

#endif
}
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