Subj : Re: lock preemption
To   : comp.unix.aix,comp.programming.threads
From : Ben Hutchings
Date : Wed Jun 22 2005 01:05 am

Kamal R. Prasad <kamalp@acm.org> wrote:
> Hello,
>
>  I am dealing with a strange beast called complex locks inside AIX
> kernel extensions. The documentation indicates that a higher priority
> thread can premept a lower priority thread holding a complex lock.
<snip>

I think you are misinterpreting a description of priority *promotion*.
This is a feature that boosts the priority of a thread holding a lock
while a higher-priority thread is waiting for the lock.  This avoids
the well-known problem of priority inversion.

-- 
Ben Hutchings
Anthony's Law of Force: Don't force it, get a larger hammer.

.