Re: Is function atomic? - Mailing list pgsql-sql

From Wei Weng
Subject Re: Is function atomic?
Date
Msg-id 994443470.16301.2.camel@Monet
Whole thread Raw
In response to Re: Is function atomic?  (Peter Eisentraut <peter_e@gmx.net>)
Responses Re: Is function atomic?
List pgsql-sql
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
> 
> 
> ---------------------------(end of broadcast)---------------------------
> TIP 6: Have you searched our list archives?
> 
> http://www.postgresql.org/search.mpl
> 

-- 
Wei Weng
Network Software Engineer
KenCast Inc.




pgsql-sql by date:

Previous
From: "Richard Huxton"
Date:
Subject: Re: Is function atomic?
Next
From: Peter Eisentraut
Date:
Subject: Re: Is function atomic?