Martijn van Oosterhout wrote:> Linux has sigaltstack so you can catch the stack overflow signal (and> other signals
obviously,but that's its main use), but it's not terribly> portable.>
I rely on the signal handler that the JVM uses for page-faults (which a
stack overflow generally amounts to) and fpe exeptions so I know that
they will generate java exceptions in a controlled way (which I in turn
translate to elog(ERROR) on the main thread).
> What you really need to do is set the stack_base_ptr every> time you execute postgres with a new stack; that
preservesexisting> semantics.>
Exactly!. What I'd really like to do in threads other than main is:
void* currentBase = switchStackBase(stackBaseOfMyThread);
PG_TRY
{ /* service the call here */ switchStackBase(currentBase);
}
PG_CATCH
{ switchStackBase(currentBase); /* generate Java exception as usual */
}
> Signals are the only way the kernel can pass control unexpectedly so if> you handle those, postgres would never know
it'sthreaded. I do wonder> if there are any other assumptions made...>> Have a nice day,
You too. And thanks for all your input.
Regards,
Thomas Hallgren