Frank Chang <frankchan...@gmail.com> wrote:
>   Good morning, If we use the latest version of sqlite, is it possible to
> update the same sqlite table using two different Centos/RedHat Linux pthread
> threads?

Yes, but not at the same time.

> We are using the same database connection on both pthreads but we
> always update different rows on each of the two threads. We have run
> some tests using the following code and occasionally  sqlite3_prepare and
> sqlite2_step returns error code 21. Here is the thread function which each
> thread runs. Below it, we show the main thread which creates and manages the
> worker threads. Thank you.
> 
> ReturnValue=sqlite3_prepare(td->This->Database,"BEGIN",-1,&(td->This->Statement),0);
>   status =  sqlite3_step(td->This->Statement);

You get SQLITE_MISUSE (error 21) when you run BEGIN statement on a connection 
that already has an explicit transaction open. SQLite doesn't support nested 
transactions.
-- 
Igor Tandetnik

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