/****************************************************************************
Desc: Thread that will delete block chains from deleted indexes and
tables in the background.
****************************************************************************/
RCODE SQFAPI F_Database::maintenanceThread(
IF_Thread * pThread)
{
RCODE rc = NE_SFLM_OK;
F_Database * pDatabase = (F_Database *)pThread->getParm1();
F_Db * pDb;
F_Row * pRow;
FLMUINT64 ui64MaintRowId;
FLMBOOL bStartedTrans;
FLMBOOL bShutdown;
F_DbSystem * pDbSystem;
FSTableCursor * pTableCursor;
FLMUINT uiBlkAddress;
FLMBOOL bIsNull;
FLMUINT uiBlocksToFree;
FLMUINT uiBlocksFreed;
Retry:
rc = NE_SFLM_OK;
pDb = NULL;
pRow = NULL;
bStartedTrans = FALSE;
bShutdown = FALSE;
pDbSystem = NULL;
pTableCursor = NULL;
if( (pDbSystem = f_new F_DbSystem) == NULL)
{
rc = RC_SET( NE_SFLM_MEM);
goto Exit;
}
pThread->setThreadStatus( FLM_THREAD_STATUS_INITIALIZING);
if( RC_BAD( rc = pDbSystem->internalDbOpen( pDatabase, &pDb)))
{
// If the file is being closed, this is not an error.
if( pDatabase->getFlags() & DBF_BEING_CLOSED)
{
rc = NE_SFLM_OK;
bShutdown = TRUE;
}
goto Exit;
}
pDbSystem->Release();
pDbSystem = NULL;
if ((pTableCursor = f_new FSTableCursor) == NULL)
{
rc = RC_SET( NE_SFLM_MEM);
goto Exit;
}
for( ;;)
{
pThread->setThreadStatus( FLM_THREAD_STATUS_RUNNING);
if( RC_BAD( rc = pDb->beginBackgroundTrans( pThread)))
{
goto Exit;
}
bStartedTrans = TRUE;
pTableCursor->resetCursor();
if (RC_BAD( rc = pTableCursor->setupRange( pDb, SFLM_TBLNUM_BLOCK_CHAINS,
1, FLM_MAX_UINT64, FALSE)))
{
goto Exit;
}
// Free up to 25 blocks per transaction.
uiBlocksToFree = 25;
while (uiBlocksToFree)
{
if (RC_BAD( rc = pTableCursor->nextRow( pDb, &pRow, &ui64MaintRowId)))
{
if (rc != NE_SFLM_EOF_HIT)
{
RC_UNEXPECTED_ASSERT( rc);
goto Exit;
}
rc = NE_SFLM_OK;
break;
}
if (RC_BAD( rc = pRow->getUINT( pDb,
SFLM_COLNUM_BLOCK_CHAINS_BLOCK_ADDRESS, &uiBlkAddress,
&bIsNull)))
{
goto Exit;
}
if (bIsNull)
{
rc = RC_SET_AND_ASSERT( NE_SFLM_DATA_ERROR);
goto Exit;
}
if( RC_BAD( rc = pDb->maintBlockChainFree(
ui64MaintRowId, uiBlkAddress, uiBlocksToFree, 0, &uiBlocksFreed)))
{
goto Exit;
}
uiBlocksToFree -= uiBlocksFreed;
}
bStartedTrans = FALSE;
if( RC_BAD( rc = pDb->commitTrans( 0, FALSE)))
{
goto Exit;
}
pThread->setThreadStatus( FLM_THREAD_STATUS_SLEEPING);
f_semWait( pDatabase->m_hMaintSem, F_WAITFOREVER);
if (pThread->getShutdownFlag())
{
bShutdown = TRUE;
goto Exit;
}
}
Exit:
pThread->setThreadStatus( FLM_THREAD_STATUS_TERMINATING);
if (pDbSystem)
{
pDbSystem->Release();
}
if (pRow)
{
pRow->ReleaseRow();
}
if( bStartedTrans)
{
pDb->abortTrans();
}
if (pDb)
{
pDb->Release();
pDb = NULL;
}
if (!bShutdown)
{
flmAssert( RC_BAD( rc));
f_sleep( 250);
f_semSignal( pDatabase->m_hMaintSem);
goto Retry;
}
return( rc);
}
/****************************************************************************
Desc: This routine links a request into a notification list and
then waits to be notified that the event has occurred. The mutex
is assumed to protect the notify list.
****************************************************************************/
RCODE FLMAPI f_notifyWait(
F_MUTEX hMutex,
F_SEM hSem,
void * pvData,
F_NOTIFY_LIST_ITEM ** ppNotifyList)
{
RCODE rc = NE_FLM_OK;
RCODE tmpRc;
F_NOTIFY_LIST_ITEM stackNotify;
F_NOTIFY_LIST_ITEM * pNotify = &stackNotify;
f_assertMutexLocked( hMutex);
f_assert( pNotify != *ppNotifyList);
f_memset( &stackNotify, 0, sizeof( F_NOTIFY_LIST_ITEM));
pNotify->uiThreadId = f_threadId();
pNotify->hSem = F_SEM_NULL;
if( hSem == F_SEM_NULL)
{
if( RC_BAD( rc = f_semCreate( &pNotify->hSem)))
{
goto Exit;
}
}
else
{
pNotify->hSem = hSem;
}
pNotify->pRc = &rc;
pNotify->pvData = pvData;
pNotify->pNext = *ppNotifyList;
*ppNotifyList = pNotify;
// Unlock the mutex and wait on the semaphore
f_mutexUnlock( hMutex);
if( RC_BAD( tmpRc = f_semWait( pNotify->hSem, F_WAITFOREVER)))
{
rc = tmpRc;
}
// Free the semaphore
if( hSem != pNotify->hSem)
{
f_semDestroy( &pNotify->hSem);
}
// Relock the mutex
f_mutexLock( hMutex);
Exit:
return( rc);
}