[uClinux-dev] armnommu and pthread

[David McCullough]

Jivin Jamie Lokier lays it down ...
> David McCullough wrote:
> > > daemon mode is not possible under uclibc, so maybe it is the same with
> > > pthread.
> > 
> > daemon's are possible under uClinux,  but the standard way of
> > daemonising is not.  It's fairly easy to work around.  Have a look at:
> > 
> > 	http://www.ucdot.org/article.pl?sid=04/08/04/1243240
> 
> I don't see anything about daemons at that link, nor when searching
> for "daemon" on ucdot.

More the pointers on vfork vs. fork which daemon uses.

> However, I do have a working version of the daemon() function for
> armnommu which I use in my own projects :-)  (And which I submitted to
> a Busybox bug report, but I don't think anyone noticed).  It is
> possible using clone() and a few instructions of assembly.

uClibc would be the best place to look at adding somethingh like this
I would guess.

> > Most of the uCLinux/malloc issues relate to fragmentation.  Have a look
> > at the ucdot FAQ's for more info:
> > 
> > 	http://www.ucdot.org/faq.pl
> 
> Yes, definitely!  Fragmentation is ridiculous - 12MB free and can't
> allocate 256kB to start an executable.  Painful.  Thank goodness for
> XIP-in-RAM to save a bit of space.
> 
> If streaming files at video rates, I'd add kswapd tuning and the right
> choice of page_alloc.c vs. page_alloc2.c are important too.

Cheers,
Davidm

-- 
David McCullough,  david_mccullough at securecomputing.com,   Ph:+61 734352815
Secure Computing - SnapGear  http://www.uCdot.org http://www.cyberguard.com