pthreadthreads.cpp

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/* ***** BEGIN LICENSE BLOCK *****
 * Source last modified: $Id: pthreadthreads.cpp,v 1.7.2.3 2004/07/09 01:43:30 hubbe Exp $
 * 
 * Portions Copyright (c) 1995-2004 RealNetworks, Inc. All Rights Reserved.
 * 
 * The contents of this file, and the files included with this file,
 * are subject to the current version of the RealNetworks Public
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 * the file under the current version of the RealNetworks Community
 * Source License (the "RCSL") available at
 * http://www.helixcommunity.org/content/rcsl, in which case the RCSL
 * will apply. You may also obtain the license terms directly from
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 * to this file, the RCSL.  Please see the applicable RPSL or RCSL for
 * the rights, obligations and limitations governing use of the
 * contents of the file.
 * 
 * Alternatively, the contents of this file may be used under the
 * terms of the GNU General Public License Version 2 or later (the
 * "GPL") in which case the provisions of the GPL are applicable
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 * use your version of this file under the terms of any one of the
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 * 
 * This file is part of the Helix DNA Technology. RealNetworks is the
 * developer of the Original Code and owns the copyrights in the
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 * 
 * This file, and the files included with this file, is distributed
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 * ***** END LICENSE BLOCK ***** */

//This is used to turn off threads in libc5 builds.
#ifdef _UNIX_THREADS_SUPPORTED

#include <errno.h>
#include "hxtypes.h"
#include "hxresult.h"

#include <pthread.h>
#include <sys/time.h>
#include <semaphore.h>
#include "pthreadthreads.h"

//=======================================================================
//
//                      HXPthreadThread
//                   ----------------------
//
//=======================================================================
HXPthreadThread::HXPthreadThread()
    : HXUnixThread()
{}

HXPthreadThread::~HXPthreadThread()
{}

HX_RESULT HXPthreadThread::_thread_create( ULONG32& ulThreadID, void*(pfExecFunc(void*)), void* pArg )
{
    HX_RESULT retVal = HXR_OK;
    pthread_t threadID=0;
    int nCode = pthread_create( &threadID, NULL, pfExecFunc, pArg );
    ulThreadID = threadID;
    if(nCode!=0)
    {
        ulThreadID = 0;
        retVal = HXR_FAIL;
        HX_ASSERT( "Failed to create thread"==NULL );
    }
    return retVal;
}

ULONG32 HXPthreadThread::_thread_self()
{
    return pthread_self();
}

void HXPthreadThread::_thread_exit(UINT32 unExitCode)
{
    pthread_exit( (void*)unExitCode );
}

void HXPthreadThread::_thread_cancel(ULONG32 ulThreadID)
{
    pthread_cancel( ulThreadID );
}

ULONG32 HXPthreadThread::_thread_join(ULONG32 ulThreadID)
{
    void* pvRetVal = NULL;
    pthread_join( ulThreadID, &pvRetVal );
    return (ULONG32)(PTR_INT)pvRetVal;
}




//=======================================================================
//
//                      HXPthreadMutex
//                   ------------------
//
//=======================================================================
HXPthreadMutex::HXPthreadMutex()
    : HXUnixMutex(),
      m_ulOwnerThread(0),
      m_ulLockCount(0)
{
     memset(&m_mutex,       0, sizeof(m_mutex));
     memset(&m_mtxLockLock, 0, sizeof(m_mtxLockLock));
#ifdef _TIMEDWAITS_RECURSIVE_MUTEXES
     pthread_mutexattr_t attr;
     pthread_mutexattr_init( &attr );
#ifdef PTHREAD_MUTEX_RECURSIVE_NP
     pthread_mutexattr_settype( &attr, PTHREAD_MUTEX_RECURSIVE_NP );
#else
     pthread_mutexattr_settype( &attr, PTHREAD_MUTEX_RECURSIVE );
#endif
     pthread_mutex_init( &m_mutex, &attr );
     pthread_mutexattr_destroy( &attr );
#else     
     pthread_mutex_init( &m_mutex,NULL);
     pthread_mutex_init( &m_mtxLockLock, NULL );
#endif     
}
    
HXPthreadMutex::~HXPthreadMutex()
{
    pthread_mutex_destroy( &m_mutex );
#ifndef _TIMEDWAITS_RECURSIVE_MUTEXES    
    m_ulLockCount   = 0;
    m_ulOwnerThread = 0;
    pthread_mutex_destroy( &m_mtxLockLock );
#endif    
}
    

HX_RESULT HXPthreadMutex::_Lock()
{
    //We simulate recursive mutexes.
    HX_RESULT res     = HXR_OK;
    int       nResult = 0;

#ifndef _TIMEDWAITS_RECURSIVE_MUTEXES    
    nResult = pthread_mutex_lock(&m_mtxLockLock);
    if (nResult != 0 )
    {
        res = HXR_FAIL;
        return res;
    }
        
    if( m_ulOwnerThread != pthread_self() )
    {
        pthread_mutex_unlock(&m_mtxLockLock);        
        //We are going to block for sure.
        nResult = pthread_mutex_lock(&m_mutex);

        //Take ownership.
        if ( pthread_mutex_lock(&m_mtxLockLock) != 0 )
        {
            //This should not happen but if does then unlock the
            //main mutex and return failure.
            if ( nResult == 0 )
            {
                pthread_mutex_unlock(&m_mutex);
            } 
            return HXR_FAIL;
        }
                
        if ( nResult == 0 )
        {
             m_ulOwnerThread = pthread_self();
             m_ulLockCount   = 1;
        }
        else
        {
            res = HXR_FAIL;
        }
    }
    else
    {
        //We alread have it locked. Just increment the lock count
        m_ulLockCount++;
    }
    pthread_mutex_unlock(&m_mtxLockLock);
#else
    pthread_mutex_lock(&m_mutex);
#endif    
    return res;
}
    
HX_RESULT HXPthreadMutex::_Unlock()
{
    HX_RESULT res     = HXR_OK;
    int       nResult = 0;

#ifndef _TIMEDWAITS_RECURSIVE_MUTEXES    
    nResult = pthread_mutex_lock(&m_mtxLockLock);
    if ( nResult != 0 )
    {
        res = HXR_FAIL;
        return res;
    }
    
    //Sanity checks.
    HX_ASSERT( m_ulLockCount != 0 && m_ulOwnerThread == pthread_self() );
    if( m_ulLockCount == 0 || m_ulOwnerThread!=pthread_self() )
    {
        pthread_mutex_unlock(&m_mtxLockLock);  
        return HXR_FAIL;
    }
    
    
    if( m_ulLockCount == 1 )
    {
        //We are really done with it. Do the real unlock now.
        nResult = pthread_mutex_unlock(&m_mutex);
        if ( nResult == 0 )
        {
            m_ulOwnerThread = 0;
            m_ulLockCount=0;
        }
        else
        {
            res = HXR_FAIL;
        }
    }
    else
    {
        m_ulLockCount--;
    }
    pthread_mutex_unlock(&m_mtxLockLock);
#else
    pthread_mutex_unlock(&m_mutex);
#endif    
    return res;
}
    
HX_RESULT HXPthreadMutex::_TryLock()
{
    HX_RESULT res = HXR_OK;    
    int       nResult = 0;

#ifndef _TIMEDWAITS_RECURSIVE_MUTEXES    
    nResult = pthread_mutex_lock(&m_mtxLockLock);
    if (nResult != 0 )
    {
        res = HXR_FAIL;
        return res;
    }
    
    if( m_ulOwnerThread != pthread_self() )
    {
        nResult = pthread_mutex_trylock(&m_mutex);
                
        if ( nResult == 0 )
        {
            m_ulOwnerThread = pthread_self();
            m_ulLockCount   = 1;
        }
        else
        {
            res = HXR_FAIL;
        }
    }
    else
    {
        //We alread have it locked. Just increment the lock count
        m_ulLockCount++;
    }
    pthread_mutex_unlock(&m_mtxLockLock);
#else
    nResult = pthread_mutex_trylock(&m_mutex);
    if ( nResult != 0 )
    {
        res = HXR_FAIL;
    }
#endif    
    return res;
}

pthread_mutex_t* HXPthreadMutex::_GetPthreadMutex()
{
    return &m_mutex;