higher speed mutexes
davidxu at freebsd.org
Thu Jan 6 08:49:31 GMT 2005
I will have low overhead pthread library available soon, for
simple mutex, it is only an atomic_cmpset_long() plus a function
call (pthread_mutex_lock) overhead.
Petri Helenius wrote:
> I have some low-contention mutexes which I'm trying to make perform
> better and I'm wondering if the current threading library does have some
> primitives I could use or if I'm better off using atomic_cmpset_* and
> pthread_yield() if the thread hit's contention (which should be about
> 1:10000 of the lock/unlock operation).
> Any scheduling caveats from above, except obviously it would spin while
> waiting for the lock. Most systems I plan on running this on have
> dual-hypethreading CPU's.
> I remember there were some discussion about dropping i386 compatible
> support for mutexes and using atomic operations instead. Is there
> code/compile time options for this on a branch I could check out and
> give it a spin?
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