On Wednesday 12 August 2009 12:36:02 Jim Donelson wrote: > On Wed, Aug 12, 2009 at 10:41 AM, Michael Schnell <mschn...@lumino.de>wrote: > > Jim Donelson wrote: > > > I wonder why (on an SP machine) you don't just disable interrupts for a > > > few instructions and give yourself an atomic dec? > > > > With many archs it's not possible to disable/enable interrupts in > > user-space. > > But, then if you have an MMU, you have atomic instructions.
assuming you mean hardware atomic instructions, the answer is "not really". -mike
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