GDB 6.0 and FreeBSD threads

[Niall Douglas]

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On 29 Mar 2004 at 22:38, Daniel Eischen wrote:

> > > Why not just run all threads SCOPE_PROCESS? Then the system will
> > > do that for you.
> > 
> > The pthreads implementations I've seen won't utilise more than one
> > processor unless it's SCOPE_SYSTEM. The obviates the reason most
> > people use threads, hence the success of the 1:1 model which is a
> > very blunt axe.
> 
> That's untrue for libpthread.  It creates automatically creates one
> KSE for each CPU.  You can increase the number of CPUs by setting
> sysctls kern.threads.debug=1 and raising kern.threads.virtual_cpu. It
> also respects pthread_setconcurrency, but you're limited to
> kern.threads.virtual_cpu.  Yes, all process scope threads run in these
> KSES.

My apologies if this is a question already answered many times 
previously - what's then the difference between specifying 
SCOPE_SYSTEM and SCOPE_PROCESS on libpthread? Is it basically whether 
the thread competes with all threads or just with threads within its 
process for that process' time slice?

Cheers,
Niall





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