On ons, 2010-02-17 at 11:05 -0500, Tom Lane wrote:
> All of the MemoryContextSwitchTo calls in plpython seem to be in
> patterns like this:
>
> MemoryContext oldcontext;
>
> oldcontext = CurrentMemoryContext;
> PG_TRY();
> {
> ... do something ...
> }
> PG_CATCH();
> {
> MemoryContextSwitchTo(oldcontext);
>
> Since oldcontext is only set in the one place, it really shouldn't
> require "volatile" decoration, but maybe it does.
It is my understanding that local automatic variables may be clobbered
by [sig]longjmp unless they are marked volatile. The PG_CATCH branch is
reached by means of a [sig]longjmp. So that would mean that any
variable that you want to use both before the TRY and inside the CATCH
has to be volatile.
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