Re: Is function atomic?

What I wanted is simple:
I don't want other processes that run the function at the same time have
read/write access from the tables this function accesses(select and
insert/update). Is it possible, say, let other proccess blocked on this
function?

On 06 Jul 2001 18:49:49 +0200, Peter Eisentraut wrote:
> Wei Weng writes:
> 
> > Does that mean if I used
> > DECLARE
> > ...
> > BEGIN
> > DO_STUFF
> > END;
> >
> > the DO_STUFF will not be interrupted (maintain atomicity) even when
> > multiple threads use the function concurrently?
> 
> Interruption, atomicity, and concurrency are separate issues.  The
> function could of course be interrupted if there's an error.  (That error
> may be related to concurrency, such as a serialization failure.)  The
> database interactions of the function will be atomic in the sense that
> rollback will work.  Concurrent execution of a function is permitted, but
> there may be issues if you modify global state or there is a serialization
> failure.  These are the same issues that you have to deal with in any
> programming environment.
> 
> -- 
> Peter Eisentraut   peter_e@gmx.net   http://funkturm.homeip.net/~peter
> 
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-- 
Wei Weng
Network Software Engineer
KenCast Inc.