Degraded multi-tasking?

dave higton davehigton at dsl.pipex.com
Wed Nov 5 14:33:25 GMT 2008


Quoting Rob Kendrick <rjek at netsurf-browser.org>:

> On Wed, 05 Nov 2008 11:58:10 +0000
> dave higton <davehigton at dsl.pipex.com> wrote:
> 
> > Quoting "David J. Ruck" <druck at druck.org.uk>:
> > 
> > > Richard Porter <ricp at minijem.plus.com> wrote:
> > > > I can replicate this problem to order. I open a window on NetSurf
> > > > which loads my local home page, http://localhost/
> > > > (internet.websites.index/html), from WebJames.
> > > 
> > > You are attempting to use a cooperatively multitasked operating
> > > system to both serve and display content, expect such problems even
> > > if the browser is working acceptibly with external servers.
> > 
> > You're being unnecessarily negative, Dave.  Many of us see similar
> > single- tasking behaviour on Windows and Linux from time to time.  It
> > isn't just a case of cooperative versus pre-emptive; it's how the app
> > is written that counts.
> 
> His point is that in a PMT system, such deadlocks cannot occur, but in
> a CMT system, enormous care must be taken to stop them being
> commonplace. Also, the RISC OS IP stack does not make this care easy
> (especially given its lack of any meaningful select() call.).

My point is that deadlocks /do/ occur in Windows and Linux, two of the
most widely known PMT systems.  We've all experienced them.  PMT, in
and of itself, is not sufficient to prevent them.

Well, I suppose now you'll tell me that you never have...

Dave


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