Messages in this thread | | | From | David Woodhouse <> | Subject | Re: spin-locks | Date | Fri, 10 May 2002 15:17:50 +0100 |
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root@chaos.analogic.com said: > Well, here is code that worked on linux 2.2.17. Same CPUs, same > everything... Just a different version of OS...
I suspect your code was protected by the BKL in 2.2.17, not by your 'spinlocks'.
root@chaos.analogic.com said: > cli > lock > incb (lockf) # Bump lock-value
Ponder what happens if two CPUs get here at the same time. Lock count is now two.
> 1: cmpb $1,(lockf) # See if we own it > jnz 1b # Nope, spin until we do.
Now they both spin forever.
-- dwmw2
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