/**************************************************************
 * 
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * 
 *************************************************************/


#include "system.h"
#include <sal/types.h>

#include <osl/conditn.h>
#include <osl/diagnose.h>
#include <osl/time.h>


typedef struct _oslConditionImpl
{
	pthread_cond_t	m_Condition;
	pthread_mutex_t	m_Lock;
	sal_Bool			m_State;
} oslConditionImpl;


/*****************************************************************************/
/* osl_createCondition */
/*****************************************************************************/
oslCondition SAL_CALL osl_createCondition()
{
  	oslConditionImpl* pCond;
    int nRet=0;
    
	pCond = (oslConditionImpl*) malloc(sizeof(oslConditionImpl));

	OSL_ASSERT(pCond);

	if ( pCond == 0 )
	{
		return 0;
	}
	
	pCond->m_State = sal_False;

	/* init condition variable with default attr. (PTHREAD_PROCESS_PRIVAT) */
    nRet =  pthread_cond_init(&pCond->m_Condition, PTHREAD_CONDATTR_DEFAULT);
	if ( nRet != 0 )
	{
	    OSL_TRACE("osl_createCondition : condition init failed. Errno: %d; '%s'\n",
                  nRet, strerror(nRet));

	    free(pCond);
		return 0;
	}

    nRet = pthread_mutex_init(&pCond->m_Lock, PTHREAD_MUTEXATTR_DEFAULT);
	if ( nRet != 0 )
	{
	    OSL_TRACE("osl_createCondition : mutex init failed. Errno: %d; %s\n",
                  nRet, strerror(nRet));
        
        nRet = pthread_cond_destroy(&pCond->m_Condition);
	    if ( nRet != 0 )
        {
            OSL_TRACE("osl_createCondition : destroy condition failed. Errno: %d; '%s'\n",
                      nRet, strerror(nRet));
        }

        free(pCond);
	    pCond = 0;
	}

	return (oslCondition)pCond;
}

/*****************************************************************************/
/* osl_destroyCondition */
/*****************************************************************************/
void SAL_CALL osl_destroyCondition(oslCondition Condition)
{
    oslConditionImpl* pCond;
    int nRet = 0;
    
	if ( Condition )
	{
	    pCond = (oslConditionImpl*)Condition;

        nRet = pthread_cond_destroy(&pCond->m_Condition);
		if ( nRet != 0 )
        {
            OSL_TRACE("osl_destroyCondition : destroy condition failed. Errno: %d; '%s'\n",
                      nRet, strerror(nRet));
        }
        nRet = pthread_mutex_destroy(&pCond->m_Lock);
		if ( nRet != 0 )
        {
            OSL_TRACE("osl_destroyCondition : destroy mutex failed. Errno: %d; '%s'\n",
                      nRet, strerror(nRet));            
        }

		free(Condition);
	}
    
    return;
}

/*****************************************************************************/
/* osl_setCondition */
/*****************************************************************************/
sal_Bool SAL_CALL osl_setCondition(oslCondition Condition)
{
   oslConditionImpl* pCond;
   int nRet=0;
   
   OSL_ASSERT(Condition);
   pCond = (oslConditionImpl*)Condition;

   if ( pCond == 0 )
   {
	   return sal_False;
   }

   nRet = pthread_mutex_lock(&pCond->m_Lock);
   if ( nRet != 0 )
   {
       OSL_TRACE("osl_setCondition : mutex lock failed. Errno: %d; %s\n",
                  nRet, strerror(nRet));
	   return sal_False;
   }

   pCond->m_State = sal_True;
   nRet = pthread_cond_broadcast(&pCond->m_Condition);
   if ( nRet != 0 )
   {
       OSL_TRACE("osl_setCondition : condition broadcast failed. Errno: %d; %s\n",
                  nRet, strerror(nRet));
	   return sal_False;
   }

   nRet = pthread_mutex_unlock(&pCond->m_Lock);
   if ( nRet != 0 )
   {
       OSL_TRACE("osl_setCondition : mutex unlock failed. Errno: %d; %s\n",
                  nRet, strerror(nRet));
       return sal_False;
   }
   
   return sal_True;

}

/*****************************************************************************/
/* osl_resetCondition */
/*****************************************************************************/
sal_Bool SAL_CALL osl_resetCondition(oslCondition Condition)
{
	oslConditionImpl* pCond;
    int nRet=0;
    
	OSL_ASSERT(Condition);

	pCond = (oslConditionImpl*)Condition;

	if ( pCond == 0 )
	{
		return sal_False;
	}

    nRet = pthread_mutex_lock(&pCond->m_Lock);
	if ( nRet != 0 )
	{
       OSL_TRACE("osl_resetCondition : mutex lock failed. Errno: %d; %s\n",
                  nRet, strerror(nRet));
		return sal_False;
	}

	pCond->m_State = sal_False;

    nRet = pthread_mutex_unlock(&pCond->m_Lock);
    if ( nRet != 0 )
    {
       OSL_TRACE("osl_resetCondition : mutex unlock failed. Errno: %d; %s\n",
                  nRet, strerror(nRet));
        return sal_False;
    }
    
	return sal_True;
}

/*****************************************************************************/
/* osl_waitCondition */
/*****************************************************************************/
oslConditionResult SAL_CALL osl_waitCondition(oslCondition Condition, const TimeValue* pTimeout)
{
	oslConditionImpl* pCond;
    int nRet=0;
	oslConditionResult Result = osl_cond_result_ok;

	OSL_ASSERT(Condition);
	pCond = (oslConditionImpl*)Condition;

	if ( pCond == 0 )
	{
		return osl_cond_result_error; 
	}

    nRet = pthread_mutex_lock(&pCond->m_Lock);
	if ( nRet != 0 )
	{
       OSL_TRACE("osl_waitCondition : mutex lock failed. Errno: %d; %s\n",
                  nRet, strerror(nRet));
		return osl_cond_result_error;
	}

    if ( pTimeout )
    {
        if ( ! pCond->m_State )
        {
			int					ret;
			struct timeval      tp;
			struct timespec		to;
			
			gettimeofday(&tp, NULL);

			SET_TIMESPEC( to, tp.tv_sec + pTimeout->Seconds,
							  tp.tv_usec * 1000 + pTimeout->Nanosec );

            /* spurious wake up prevention */
            do
            {
                ret = pthread_cond_timedwait(&pCond->m_Condition, &pCond->m_Lock, &to);
				if ( ret != 0 )
				{
					if ( ret == ETIME || ret == ETIMEDOUT )
					{
						Result = osl_cond_result_timeout;
                        nRet = pthread_mutex_unlock(&pCond->m_Lock);                        
						if (nRet != 0)    
                        {
                            OSL_TRACE("osl_waitCondition : mutex unlock failed. Errno: %d; %s\n",
                                      nRet, strerror(nRet));
                        }
                        
						return Result;
					}
					else if ( ret != EINTR )
					{
						Result = osl_cond_result_error;
                        nRet = pthread_mutex_unlock(&pCond->m_Lock);                        
						if ( nRet != 0 )    
                        {
                            OSL_TRACE("osl_waitCondition : mutex unlock failed. Errno: %d; %s\n",
                                      nRet, strerror(nRet));
                        }
						return Result;
					}
/*                    OSL_TRACE("EINTR\n");*/
				}
            }
            while ( !pCond->m_State );
		}
	}
    else
    {
        while ( !pCond->m_State )
        {
            nRet = pthread_cond_wait(&pCond->m_Condition, &pCond->m_Lock);
			if ( nRet != 0 )
			{
                OSL_TRACE("osl_waitCondition : condition wait failed. Errno: %d; %s\n",
                          nRet, strerror(nRet));
				Result = osl_cond_result_error;
				nRet = pthread_mutex_unlock(&pCond->m_Lock);
                if ( nRet != 0 )
                {
                    OSL_TRACE("osl_waitCondition : mutex unlock failed. Errno: %d; %s\n",
                              nRet, strerror(nRet));
                }
                
				return Result;
			}
		}
    }

	nRet = pthread_mutex_unlock(&pCond->m_Lock);
    if ( nRet != 0 )
    {
        OSL_TRACE("osl_waitCondition : mutex unlock failed. Errno: %d; %s\n",
                  nRet, strerror(nRet));
    }

	return Result;
}

/*****************************************************************************/
/* osl_checkCondition */
/*****************************************************************************/
sal_Bool SAL_CALL osl_checkCondition(oslCondition Condition)
{
	sal_Bool State;
	oslConditionImpl* pCond;
    int nRet=0;
    
	OSL_ASSERT(Condition);
	pCond = (oslConditionImpl*)Condition;

	if ( pCond == 0 )
	{
		return sal_False;
	}
	
	nRet = pthread_mutex_lock(&pCond->m_Lock);
    if ( nRet != 0 )
    {
        OSL_TRACE("osl_checkCondition : mutex unlock failed. Errno: %d; %s\n",
                  nRet, strerror(nRet));        
    }
	
	State = pCond->m_State;

	nRet = pthread_mutex_unlock(&pCond->m_Lock);
    if ( nRet != 0 )
    {
        OSL_TRACE("osl_checkCondition : mutex unlock failed. Errno: %d; %s\n",
                  nRet, strerror(nRet));
    }

	return State;
}