[sqlite] database is locked

[anis chaaba]

Hello,
I have processes that access to my database, one writing on it and the other
just reading. when this case take place an error message occure saying that
database is locked.
I saw in sqlite3 docs that sqlite3 enable this type of access but i don't
know how can I activate this option.
Is that by compiling sqlite3 with a special option or by specifying this
option in my c acess code?
thanks in advance for help