Locking

db_get_tableid db_lock db_lock_table db_unlock

db_hlock_t db_lock_table ( db_t  hdb, const db_objname_t *  table_name, db_flags_t  lock_mode   ) Lock a table, preventing others from modifying table contents. Parameters: hdb  Database handle. table_name  Table name. lock_mode  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: Table lock handle. NULL on failure. On failure, one of the following error codes is set: DB_EINVAL Caused by: invalid database handle, invalid flags, invalid object ID. DB_ENOLOCK There are no available lock cells. See also: get_db_error, clear_db_error, Error Handling