[fpc-devel] Feature announcement: Extension of TThread's interface

microcode at zoho.com microcode at zoho.com
Fri Dec 28 06:46:05 CET 2012

On Thu, Dec 27, 2012 at 07:01:08PM +0000, Mark Morgan Lloyd wrote:
> Ewald wrote:
> >Now, for the implementation of ProcessorCount I've got code here that
> >reads the amount of processor cores from `/proc/cpuinfo` (linux only I
> >think) and some assembly code [asmmode att] (tested on x86_64 and i386)
> >that *tries* to get the amount of cpu cores by the use of CPUID. The
> In the general case, you have to be careful with this since (a)
> every architecture puts different info in /proc/cpuinfo and (b) the
> processor numbering and affinity vectors can have gaps.

In the general case how is his x86 asm supposed to ever work on anything but
Intel or AMD boxes?

> type            : sun4u
> ncpus probed    : 12
> ncpus active    : 12
> ..
> CPU0:           online
> CPU1:           online
> CPU4:           online
> CPU5:           online
> CPU8:           online
> CPU9:           online
> CPU10:          online
> CPU11:          online
> CPU12:          online
> CPU13:          online
> CPU14:          online
> CPU15:          online

Looks like a weird bug in the probing. Why does it miss CPs 2,3,6,7?

More information about the fpc-devel mailing list