[sqlite] how to get notice when database is free after it was busy

[Walter Meerschaert]

As a courtesy to my users, I wish to pop up a message thingy telling the user when the program is waiting for the database to not be busy. Right now I register a busy handler, and so I know how long I have been waiting, because we have the count parameter, when it is 1, I look at the clock, when the clock goes past 3 seconds or so it is time to tell the user tio cool his heels while we wait for some process to commit or rollback. As far as I can tell, there is no direct way to know when the database has begun responding again. The busy handler simply stops being called. 

Is there a direct way I fail to see? Or, perhaps there could be an addition to 
the api wherein we are told when the buy state is no more. Perhaps we could 
register a no_longer_busy_handler, which could take the same parameters as the 
busy handler but pass in -1 for the count.