Locks a database so threading operations will not interrupt. If you are using a database Handle for both threading and non-threading, this MUST be called before doing any set of non-threading DB operations. Otherwise you risk corrupting the database driver's memory or network connection. Leaving a lock on a database and then executing a threaded query results in a dead lock! Make sure to call SQL_UnlockDatabase()! If the lock cannot be acquired, the main thread will pause until the threaded operation has concluded. Care should be taken to not lock an already-locked database. Internally, lock calls are nested recursively and must be paired with an equal amount of unlocks to be undone. This behaviour should not be relied on.
native void SQL_LockDatabase(Handle database)