Re: emulating no-senders notifications in L4?

[Adam Olsen]

On Wed, Jan 02, 2002 at 10:59:58AM +0100, Ondrej Hurt wrote:
> 
> > I think it'd be interesting to see if they really are recursive, or
> > just looping.  To do that you'd need to mprotect a page of memory,
> > generate the fault on that, then after 30000 or so iterations
> > un-mprotect it and let the signal handler return.  See if they all
> > print out "end of handler".
> 
> > Adam Olsen, aka Rhamphoryncus
> 
> I can't imagine how it could be looping. IMO classic (e.g. in Linux)
> exception handling is a sudden function call jumping to kernel (or
> just libc?) which then calls your handler so it is some sort of
> indirect recursion. I tried the test you proposed and all SIGSEGV
> handler calls returned (30000x "end of handler").

I didn't think they'd be looping either, but I don't know how it's
supposed to behave.  Well, I guess I know now :)

-- 
Adam Olsen, aka Rhamphoryncus