concurrent access to sqlite

For concurrent access to a single sqlite database, do I still need to use a mutex lock on the handle to the database( sqlite3 * ) for each thread since sqlite is ACID compliant?
After reading http://www.sqlite.org/lockingv3.html, it seems the answer is no, but I've never used it concurrently without locking.
I got a document not found from that link

can anyone else who have used it concurrently before tell me?

@kbw
so you mean everytime you used it concurrently, you lock the handle with a mutex?
http://www.sqlite.org/lockingv3.html

try this link (the same thing without ",")
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