JPIP driver in endless loop

[gaopeng]

On one of my test services, the driver worked for awhile, and then gave the following error message each time GetNextUpdatedRegion is called, and returned PENDING, instead of ERROR.

ERROR 1: EOF reached before completing VBAS
ERROR 1: EOF reached before completing VBAS
ERROR 1: EOF reached before completing VBAS
ERROR 1: EOF reached before completing VBAS
ERROR 1: EOF reached before completing VBAS
ERROR 1: EOF reached before completing VBAS
ERROR 1: EOF reached before completing VBAS

[gaopeng]

There is one mroe case of endless loop:

void JPIPKAKAsyncReader::Stop()
{
    JPIPKAKDataset *poJDS = (JPIPKAKDataset*)poDS;

    bComplete = 1;
    if (poJDS->pGlobalMutex)
    {
        if (((bHighPriority) && (!poJDS->bHighThreadFinished)) || 
            ((!bHighPriority) && (!poJDS->bLowThreadFinished)))
        {
            // stop the thread
            if (bHighPriority)
            {
                CPLAcquireMutex(poJDS->pGlobalMutex, 100.0);
                poJDS->bHighThreadRunning = 0;
                CPLReleaseMutex(poJDS->pGlobalMutex);
		
                while (!poJDS->bHighThreadFinished)
                    CPLSleep(0.1);  // <<< poJDS->bHighThreadFinished is never true
           ...

[gaopeng]

Another case of endless loop:

    // if there is no pending data and we don't want to wait.
    if( nSize == 0 )   <<< nSize always 0
    {
        *pnxbufoff = 0;
        *pnybufoff = 0;
        *pnxbufsize = 0;
        *pnybufsize = 0;		
        return GARIO_PENDING;
    }