xref: /trunk/main/sal/osl/unx/conditn.c (revision 9664d1e0736bd476d60a744c560a8594e973e313)

/**************************************************************
 *
 * 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 == NULL )
    {
        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 = NULL;
    }

    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 == NULL )
    {
        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));
        (void)pthread_mutex_unlock(&pCond->m_Lock);
        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 == NULL )
    {
        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 == NULL )
    {
        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 == NULL )
    {
        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;
}