On Tue, 19 Dec 2000, Harald Koerfgen wrote: > Another possibility would be to rely on the userland ll/sc emulation in the > kernel. The one in the linux-vr tree seems to be working well and can easily be > backported to Linux/MIPS. This should work but it looks ugly to me and the performance would suck horribly. > Advantage: userland binary compatibility. > Disadvantage: possibility for a lot of context switches for userland atomic > operations. We may implement the emulation anyway, just like we emulate unaligned accesses. > Having a sysmips(MIPS_ATOMIC_SET, ...) or atomic_op() solution would probably a > lot faster. > > Maybe we should implement both :) If we could afford another syscall number then I would prefer atomic_op() at the moment as it is well-documented and it does not overload one function for various purposes, i.e. it's a bit faster. Maciej -- + Maciej W. Rozycki, Technical University of Gdansk, Poland + +--------------------------------------------------------------+ + e-mail: macro@ds2.pg.gda.pl, PGP key available +
