Date: Thu, 06 Jan 2005 09:36:49 +0200 From: Petri Helenius <pete@he.iki.fi> To: freebsd-threads@freebsd.org Subject: higher speed mutexes Message-ID: <41DCEA91.6040402@he.iki.fi>
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Hi, 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? Pete
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