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TimerThread.c

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/*!
 * \file
 */


#include "TimerThread.h"


#include <assert.h>


/*!
 * \brief Deallocates a dynamically allocated TimerEvent.
 */
00047 static void FreeTimerEvent(
      /*! [in] Valid timer thread pointer. */
      TimerThread *timer,
      /*! [in] Must be allocated with CreateTimerEvent*/
      TimerEvent *event)
{
      assert(timer != NULL);

      FreeListFree(&timer->freeEvents, event);
}


/*!
 * \brief Implements timer thread.
 *
 * Waits for next event to occur and schedules associated job into threadpool.
 */
00064 static void *TimerThreadWorker(
      /*! [in] arg is cast to (TimerThread *). */
      void *arg)
{
    TimerThread *timer = ( TimerThread * ) arg;
    ListNode *head = NULL;

    TimerEvent *nextEvent = NULL;

    time_t currentTime = 0;
    time_t nextEventTime = 0;
    struct timespec timeToWait;

    int tempId;

    assert( timer != NULL );

    ithread_mutex_lock( &timer->mutex );

    while( 1 )
    {
        //mutex should always be locked at top of loop
        //Check for shutdown
        if( timer->shutdown )
        {
            timer->shutdown = 0;
            ithread_cond_signal( &timer->condition );
            ithread_mutex_unlock( &timer->mutex );
            return NULL;
        }

        nextEvent = NULL;

        //Get the next event if possible
        if( timer->eventQ.size > 0 )
        {
            head = ListHead( &timer->eventQ );
            nextEvent = ( TimerEvent * ) head->item;
            nextEventTime = nextEvent->eventTime;
        }

        currentTime = time( NULL );

        //If time has elapsed, schedule job
        if( ( nextEvent != NULL ) && ( currentTime >= nextEventTime ) )
        {
            if( nextEvent->persistent ) {
                ThreadPoolAddPersistent( timer->tp, &nextEvent->job,
                                         &tempId );
            } else {
                ThreadPoolAdd( timer->tp, &nextEvent->job, &tempId );
            }
            ListDelNode( &timer->eventQ, head, 0 );
            FreeTimerEvent( timer, nextEvent );
            continue;
        }

        if( nextEvent != NULL ) {
            timeToWait.tv_nsec = 0;
            timeToWait.tv_sec = nextEvent->eventTime;
            ithread_cond_timedwait( &timer->condition, &timer->mutex,
                                    &timeToWait );
        } else {
            ithread_cond_wait( &timer->condition, &timer->mutex );
        }
    }
}


/*!
 * \brief Calculates the appropriate timeout in absolute seconds
 * since Jan 1, 1970.
 *
 * \return 
 */
00139 static int CalculateEventTime(
      /*! [in] Timeout. */
      time_t *timeout,
      /*! [in] Timeout type. */
      TimeoutType type)
{
    time_t now;

    assert( timeout != NULL );

    if( type == ABS_SEC )
        return 0;
    else if( type == REL_SEC ) {
        time( &now );
        ( *timeout ) += now;
        return 0;
    }

    return -1;

}

/*!
 * \brief Creates a Timer Event. (Dynamically allocated).
 *
 * \return (TimerEvent *) on success, NULL on failure.
 */
00166 static TimerEvent *CreateTimerEvent(
      /*! [in] Valid timer thread pointer. */
      TimerThread *timer,
      /*! [in] . */
      ThreadPoolJob *job,
      /*! [in] . */
      Duration persistent,
      /*! [in] The absoule time of the event in seconds from Jan, 1970. */
      time_t eventTime,
      /*! [in] Id of job. */
      int id)
{
    TimerEvent *temp = NULL;

    assert( timer != NULL );
    assert( job != NULL );

    temp = ( TimerEvent * ) FreeListAlloc( &timer->freeEvents );
    if( temp == NULL )
        return temp;
    temp->job = ( *job );
    temp->persistent = persistent;
    temp->eventTime = eventTime;
    temp->id = id;

    return temp;
}


00195 int TimerThreadInit(TimerThread *timer, ThreadPool *tp)
{

    int rc = 0;

    ThreadPoolJob timerThreadWorker;

    assert( timer != NULL );
    assert( tp != NULL );

    if( ( timer == NULL ) || ( tp == NULL ) ) {
        return EINVAL;
    }

    rc += ithread_mutex_init( &timer->mutex, NULL );

    assert( rc == 0 );

    rc += ithread_mutex_lock( &timer->mutex );
    assert( rc == 0 );

    rc += ithread_cond_init( &timer->condition, NULL );
    assert( rc == 0 );

    rc += FreeListInit( &timer->freeEvents, sizeof( TimerEvent ), 100 );
    assert( rc == 0 );

    timer->shutdown = 0;
    timer->tp = tp;
    timer->lastEventId = 0;
    rc += ListInit( &timer->eventQ, NULL, NULL );

    assert( rc == 0 );

    if( rc != 0 ) {
        rc = EAGAIN;
    } else {

        TPJobInit( &timerThreadWorker, TimerThreadWorker, timer );
        TPJobSetPriority( &timerThreadWorker, HIGH_PRIORITY );

        rc = ThreadPoolAddPersistent( tp, &timerThreadWorker, NULL );
    }

    ithread_mutex_unlock( &timer->mutex );

    if( rc != 0 ) {
        ithread_cond_destroy( &timer->condition );
        ithread_mutex_destroy( &timer->mutex );
        FreeListDestroy( &timer->freeEvents );
        ListDestroy( &timer->eventQ, 0 );
    }

    return rc;

}


00253 int TimerThreadSchedule(
      TimerThread *timer,
      time_t timeout,
      TimeoutType type,
      ThreadPoolJob *job,
      Duration duration,
      int *id)
{

    int rc = EOUTOFMEM;
    int found = 0;
    int tempId = 0;

    ListNode *tempNode = NULL;
    TimerEvent *temp = NULL;
    TimerEvent *newEvent = NULL;

    assert( timer != NULL );
    assert( job != NULL );

    if( ( timer == NULL ) || ( job == NULL ) ) {
        return EINVAL;
    }

    CalculateEventTime( &timeout, type );
    ithread_mutex_lock( &timer->mutex );

    if( id == NULL )
        id = &tempId;

    ( *id ) = INVALID_EVENT_ID;

    newEvent = CreateTimerEvent( timer, job, duration, timeout,
                                 timer->lastEventId );

    if( newEvent == NULL ) {
        ithread_mutex_unlock( &timer->mutex );
        return rc;
    }

    tempNode = ListHead( &timer->eventQ );
    //add job to Q
    //Q is ordered by eventTime
    //with the head of the Q being the next event

    while( tempNode != NULL ) {
        temp = ( TimerEvent * ) tempNode->item;
        if( temp->eventTime >= timeout )
        {

            if( ListAddBefore( &timer->eventQ, newEvent, tempNode ) !=
                NULL )
                rc = 0;
            found = 1;
            break;

        }
        tempNode = ListNext( &timer->eventQ, tempNode );
    }

    //add to the end of Q
    if( !found ) {

        if( ListAddTail( &timer->eventQ, newEvent ) != NULL )
            rc = 0;

    }
    //signal change in Q
    if( rc == 0 ) {

        ithread_cond_signal( &timer->condition );
    } else {
        FreeTimerEvent( timer, newEvent );
    }
    ( *id ) = timer->lastEventId++;
    ithread_mutex_unlock( &timer->mutex );

    return rc;
}


00334 int TimerThreadRemove(
      TimerThread *timer,
      int id,
      ThreadPoolJob *out)
{
    int rc = INVALID_EVENT_ID;
    ListNode *tempNode = NULL;
    TimerEvent *temp = NULL;

    assert( timer != NULL );

    if( timer == NULL ) {
        return EINVAL;
    }

    ithread_mutex_lock( &timer->mutex );

    tempNode = ListHead( &timer->eventQ );

    while( tempNode != NULL ) {
        temp = ( TimerEvent * ) tempNode->item;
        if( temp->id == id )
        {

            ListDelNode( &timer->eventQ, tempNode, 0 );
            if( out != NULL )
                ( *out ) = temp->job;
            FreeTimerEvent( timer, temp );
            rc = 0;
            break;
        }
        tempNode = ListNext( &timer->eventQ, tempNode );
    }

    ithread_mutex_unlock( &timer->mutex );
    return rc;
}


00373 int TimerThreadShutdown(TimerThread *timer)
{
    ListNode *tempNode2 = NULL;
    ListNode *tempNode = NULL;

    assert( timer != NULL );

    if( timer == NULL ) {
        return EINVAL;
    }

    ithread_mutex_lock( &timer->mutex );

    timer->shutdown = 1;
    tempNode = ListHead( &timer->eventQ );

    //Delete nodes in Q
    //call registered free function 
    //on argument
    while( tempNode != NULL ) {
        TimerEvent *temp = ( TimerEvent * ) tempNode->item;

        tempNode2 = ListNext( &timer->eventQ, tempNode );
        ListDelNode( &timer->eventQ, tempNode, 0 );
        if( temp->job.free_func ) {
            temp->job.free_func( temp->job.arg );
        }
        FreeTimerEvent( timer, temp );
        tempNode = tempNode2;
    }

    ListDestroy( &timer->eventQ, 0 );
    FreeListDestroy( &timer->freeEvents );

    ithread_cond_broadcast( &timer->condition );

    while( timer->shutdown )    //wait for timer thread to shutdown
    {
        ithread_cond_wait( &timer->condition, &timer->mutex );
    }

    ithread_mutex_unlock( &timer->mutex );

    //destroy condition
    while( ithread_cond_destroy( &timer->condition ) != 0 ) {
    }

    //destroy mutex
    while( ithread_mutex_destroy( &timer->mutex ) != 0 ) {
    }

    return 0;
}


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