Levels of Multithread Support

SourcePro : DB Interface Module User’s Guide : PART III Using Advanced Features : Multithreading : Levels of Multithread Support

Each class in the DB Interface Module provides a specific level of multithread support. Application programs must ensure that each class is used appropriately, based on the safety level it provides. For a definition of thread safety levels, see Section 2.4.4, “Multithread Safety,” in the Essential Tools Module User’s Guide.

Table 13 lists all the classes of the DB Interface Module with their MT-safe level.

Table 13 – Levels of MT-safety in the DB Interface Module classes
Classes of the DB Interface Module	MT-safe level
RWDBAssignment	1
RWDBBlob	1
RWDBBoundExpr	1
RWDBBulkInserter	0
RWDBBulkReader	0
RWDBCollectableExpr	1
RWDBColumn	1
RWDBCompoundSelector	0
RWDBConnection	1
RWDBConnCallback	11
RWDBConnCallbackImp	11
RWDBCriterion	1
RWDBCritFormDefinition	1
RWDBCritFuncDef{n} i.e. RWDBCritFuncDef0, RWDBCritFuncDef1, etc.	1
RWDBCursor	0
RWDBDatabase	2
RWDBDatabaseCallback	21
RWDBDatabaseCallbackImp	21
RWDBDeleter	0
RWDBDuration	1
RWDBEnvironmentHandle	0
RWDBExpr	1
RWDBExprFormDefinition	1
RWDBExprFuncDef{n}, i.e. RWDBExprFuncDef0, RWDBExprFuncDef1, etc.	1
RWDBForeignKey	1
RWDBForeignKeyList	1
RWDBInserter	0
RWDBJoinExpr	1
RWDBManager	0
RWDBMBString	0
RWDBMemTable	0
RWDBMultiRow	0
RWDBNullIndicator	1
RWDBOSql	0
RWDBPhraseBook	1
RWDBReader	0
RWDBResult	0
RWDBRow	1
RWDBSchema	1
RWDBSelector	0
RWDBSelectorBase	0
RWDBSimpleCaseExpr	1
RWDBSearchedCaseExpr	1
RWDBStatus	1
RWDBStoredProc	0
RWDBSystemHandle	0
RWDBTable	0
RWDBTBuffer<T>	0
RWDBTPtrMemTable<T,C>	0
RWDBTracer	1
RWDBUpdater	0
RWDBValue	1

1 Only the callback methods in the callback classes are invoked with the levels of MT-safety indicated. Otherwise, the callback classes are at MT-safety 0.