CPLErr GDALHashSetBandBlockCache::AdoptBlock( GDALRasterBlock * poBlock )
{
FreeDanglingBlocks();
CPLLockHolderOptionalLockD( hLock );
m_oSet.insert(poBlock);
return CE_None;
}
GDALRasterBlock *GDALHashSetBandBlockCache::TryGetLockedBlockRef(
int nXBlockOff, int nYBlockOff )
{
GDALRasterBlock oBlockForLookup(nXBlockOff, nYBlockOff);
GDALRasterBlock* poBlock;
{
CPLLockHolderOptionalLockD( hLock );
auto oIter = m_oSet.find(&oBlockForLookup);
if( oIter == m_oSet.end() )
return nullptr;
poBlock = *oIter;
}
if( !poBlock->TakeLock() )
return nullptr;
return poBlock;
}
void GDALAbstractBandBlockCache::FreeDanglingBlocks()
{
GDALRasterBlock* poList;
{
CPLLockHolderOptionalLockD(hSpinLock);
poList = psListBlocksToFree;
psListBlocksToFree = NULL;
}
while( poList )
{
#ifdef DEBUG_VERBOSE_ABBC
CPLAtomicDec(&nAllBandsKeptAlivedBlocks);
fprintf(stderr, "FreeDanglingBlocks(): nAllBandsKeptAlivedBlocks=%d\n", nAllBandsKeptAlivedBlocks);
#endif
GDALRasterBlock* poNext = poList->poNext;
poList->poNext = NULL;
delete poList;
poList = poNext;
}
}
void GDALAbstractBandBlockCache::AddBlockToFreeList( GDALRasterBlock *poBlock )
{
CPLAssert(poBlock->poPrevious == NULL);
CPLAssert(poBlock->poNext == NULL);
{
#ifdef DEBUG_VERBOSE_ABBC
CPLAtomicInc(&nAllBandsKeptAlivedBlocks);
fprintf(stderr, "AddBlockToFreeList(): nAllBandsKeptAlivedBlocks=%d\n", nAllBandsKeptAlivedBlocks);
#endif
CPLLockHolderOptionalLockD(hSpinLock);
poBlock->poNext = psListBlocksToFree;
psListBlocksToFree = poBlock;
}
// If no more blocks in transient state, then warn WaitKeepAliveCounter()
CPLAcquireMutex(hCondMutex, 1000);
if( CPLAtomicDec(&nKeepAliveCounter) == 0 )
{
CPLCondSignal(hCond);
}
CPLReleaseMutex(hCondMutex);
}
GDALRasterBlock* GDALAbstractBandBlockCache::CreateBlock(int nXBlockOff,
int nYBlockOff)
{
GDALRasterBlock* poBlock;
{
CPLLockHolderOptionalLockD(hSpinLock);
poBlock = psListBlocksToFree;
if( poBlock )
{
#ifdef DEBUG_VERBOSE_ABBC
CPLAtomicDec(&nAllBandsKeptAlivedBlocks);
fprintf(stderr, "CreateBlock(): nAllBandsKeptAlivedBlocks=%d\n", nAllBandsKeptAlivedBlocks);
#endif
psListBlocksToFree = poBlock->poNext;
}
}
if( poBlock )
poBlock->RecycleFor(nXBlockOff, nYBlockOff);
else
poBlock = new (std::nothrow) GDALRasterBlock(
poBand, nXBlockOff, nYBlockOff );
return poBlock;
}
CPLErr GDALHashSetBandBlockCache::FlushCache()
{
FreeDanglingBlocks();
CPLErr eGlobalErr = poBand->eFlushBlockErr;
std::set<GDALRasterBlock*, BlockComparator> oOldSet;
{
CPLLockHolderOptionalLockD( hLock );
oOldSet = std::move(m_oSet);
}
StartDirtyBlockFlushingLog();
for( auto& poBlock: oOldSet )
{
if( poBlock->DropLockForRemovalFromStorage() )
{
CPLErr eErr = CE_None;
if( eGlobalErr == CE_None && poBlock->GetDirty() )
{
UpdateDirtyBlockFlushingLog();
eErr = poBlock->Write();
}
delete poBlock;
if( eErr != CE_None )
eGlobalErr = eErr;
}
}
EndDirtyBlockFlushingLog();
WaitKeepAliveCounter();
return( eGlobalErr );
}
