int GDALRasterBlock::FlushCacheBlock()
{
int nXOff, nYOff;
GDALRasterBand *poBand;
{
CPLMutexHolderD( &hRBMutex );
GDALRasterBlock *poTarget = (GDALRasterBlock *) poOldest;
while( poTarget != NULL && poTarget->GetLockCount() > 0 )
poTarget = poTarget->poPrevious;
if( poTarget == NULL )
return FALSE;
poTarget->Detach();
nXOff = poTarget->GetXOff();
nYOff = poTarget->GetYOff();
poBand = poTarget->GetBand();
}
CPLErr eErr = poBand->FlushBlock( nXOff, nYOff );
if (eErr != CE_None)
{
/* Save the error for later reporting */
poBand->SetFlushBlockErr(eErr);
}
return TRUE;
}
CPLErr GDALArrayBandBlockCache::FlushBlock( int nXBlockOff, int nYBlockOff,
int bWriteDirtyBlock )
{
int nBlockIndex;
GDALRasterBlock *poBlock = NULL;
/* -------------------------------------------------------------------- */
/* Simple case for single level caches. */
/* -------------------------------------------------------------------- */
if( !bSubBlockingActive )
{
nBlockIndex = nXBlockOff + nYBlockOff * poBand->nBlocksPerRow;
poBlock = u.papoBlocks[nBlockIndex];
u.papoBlocks[nBlockIndex] = NULL;
}
/* -------------------------------------------------------------------- */
/* Identify our subblock. */
/* -------------------------------------------------------------------- */
else
{
int nSubBlock = TO_SUBBLOCK(nXBlockOff)
+ TO_SUBBLOCK(nYBlockOff) * nSubBlocksPerRow;
/* -------------------------------------------------------------------- */
/* Check within subblock. */
/* -------------------------------------------------------------------- */
GDALRasterBlock **papoSubBlockGrid = u.papapoBlocks[nSubBlock];
if( papoSubBlockGrid == NULL )
return CE_None;
int nBlockInSubBlock = WITHIN_SUBBLOCK(nXBlockOff)
+ WITHIN_SUBBLOCK(nYBlockOff) * SUBBLOCK_SIZE;
poBlock = papoSubBlockGrid[nBlockInSubBlock];
papoSubBlockGrid[nBlockInSubBlock] = NULL;
}
if( poBlock == NULL )
return CE_None;
if( !poBlock->DropLockForRemovalFromStorage() )
return CE_None;
/* -------------------------------------------------------------------- */
/* Is the target block dirty? If so we need to write it. */
/* -------------------------------------------------------------------- */
CPLErr eErr = CE_None;
poBlock->Detach();
if( bWriteDirtyBlock && poBlock->GetDirty() )
eErr = poBlock->Write();
/* -------------------------------------------------------------------- */
/* Deallocate the block; */
/* -------------------------------------------------------------------- */
delete poBlock;
return eErr;
}