I thought maybe for some reasons, the context of calling the progress handler and user function might be different for sqlite. But according to the docs, the progress handler is already quite restricted in what it can do (no database connection modification). Also common sense hints that both are quite "external" for Sqlite. Probably the main concern for me in this case is to get the progress handler I registered previously. In my case it's not global, but specific for particular database connection oop object. I'm sure there's no sqlite3_get_progress_handler or something like this in api, so probably I will have to implement some global registration to obtain the handler of a database connection from the global context of user functions.