"Marshall, Steve" <[EMAIL PROTECTED]> writes:
> There is a problem in PL/TCL that can cause the postgres backend to 
> become multithreaded.   Postgres is not designed to be multithreaded, so 
> this causes downstream errors in signal handling.  We have seen this 
> cause a number of "unexpected state" errors associated with notification 
> handling; however, unpredictable signal handling would be likely to 
> cause other errors as well. 

I've applied this patch to CVS HEAD (8.3-to-be).  I'm a bit hesitant
to back-patch it however, at least not till it gets through some beta

Thanks for the detailed explanation, test case, and patch!

                        regards, tom lane

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