[sqlite] backup open database

[Damian Slee]

hi all,
i want to make a copy of a sqlite3 database file while it is open.  is there 
anyway that i can tell programatically that any caches/journals are flushed 
out? or is there any way to get and exclusive lock i guess, before making a 
backup copy?
 
my proposed application would have quite a few threads which may have the same 
sqlite db open for read or write (rarer), but i dont want to shut down the 
application to definitely know it is safe to copy.
 
 
thanks,
 
damian