Locking

db_get_tableid db_lock db_lock_table db_unlock

db_hlock_t db_lock ( db_t  hdb, const db_oid_t *  oid, db_flags_t  flags   ) Lock a database object (a table or a row). Parameters: hdb  Database handle. oid  Object id of object to lock. flags  Lock mode. Timeout mode: DB_TRY_LOCK Return immediately if lock can't be granted. Lock mode: DB_LOCK_DEFAULT Default lock mode. DB_LOCK_SHARED Obtain shared locks when possible. DB_LOCK_EXCLUSIVE Obtain exclusive locks only. Lock duration: DB_COMMIT_LOCK Release lock automatically when transaction is finished. DB_INSTANT_LOCK Release lock manually before the transaction is finished. DB_MANUAL_LOCK Release lock manually. Returns: Lock handle. NULL on failure. On failure, one of the following error codes is set: DB_EINVAL Invalid required parameter. See also: get_db_error, clear_db_error, Error Handling