Messages in this thread | | | Date | Wed, 14 Oct 2009 21:34:02 -0700 | From | "Paul E. McKenney" <> | Subject | Re: Userspace RCU 0.2.3 |
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On Wed, Oct 14, 2009 at 10:39:25PM -0400, Mathieu Desnoyers wrote: > * Paul E. McKenney (paulmck@linux.vnet.ibm.com) wrote: > > On Wed, Oct 14, 2009 at 06:36:57PM -0400, Mathieu Desnoyers wrote: > > > Hi, > > > > > > I just released lib urcu 0.2.3, which is now using autotools. I also > > > integrated automatic architecture detection for old 386 which lack > > > cmpxchg (using a fall-back if necessary). I also use a lock; addl > > > instead of mfence on x86-32 to support a larger variety of older Intel > > > CPUs. > > > > !!! > > > > Is there anyone on these lists other than me who has actually used an > > SMP 80386-based system? > > SMP 386, ugh, no. But UP 386 yes (at least me). :) > > It will become important as the library gets integrated in > distributions. > > > Either way, much appreciated for old time's sake. The things we used > > to do to avoid the need for cmpxchg! ;-) > > In this case I disable signals and take a mutex around the cmpxchg. It's > really a best effort. Should be fine on UP 386, but not so much on SMP > 386, as mixing it with assign/xchg pointer could lead to races. I'm not > sure it's worth trying to support 386 SMP though.
Definitely not worth much, if anything, to support 386 SMP.
Thanx, Paul
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