george anzinger wrote:
> > > > At the moment I implemented by own delay loop using a small assembler
> > > > loop similar to the one used in the kernel. This has two disadvantages:
> > > > assembler isn't that portable, and the loop has to be calibrated.
> > >
> > > Why not use C? As long as you calibrate it, it should do just fine.
> > Because the compiler might optimize it away.
>
> Not if you use volatile on the data type.
I did a lost of testing and experimenting, and found the assembler loop
the best solution (it has the finest granualrity even on slower
systems).
> > > the other hand, since you are looping anyway, why not loop on a system
> > > time of day call and have the loop exit when you have the required time
> > > in hand. These calls have microsecond resolution.
> > I'm afraid they don't (at least with kernel 2.0, I didn't try this with
> > 2.4).
>
> Gosh, I started with 2.2.14 and it does full microsecond resolution.
Oh! Shame on me! I must have missed something here!
I could swear that this didn't work for me. I tried it yesterday, you
are right, there is microsecond resolution. Even on an old 2.0.38
kernel...
This solves all my problems. I'll loop on gettimeofday().
Thanks a lot!
Michael
-- netWorks Vox: +43 316 692396 Michael Reinelt Fax: +43 316 692343 Geisslergasse 4 GSM: +43 676 3079941 A-8045 Graz, Austria e-mail: reinelt@eunet.at - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Thu Mar 15 2001 - 21:00:12 EST