ncm@zembu.com (Nathan Myers) writes:
> Since the actual instruction sequence is probably lifted from the
> MIPS manual, it's probably much freer than GPL. For the paranoid,
> the actual instructions, extracted, are just
>
> 1:
> ll %0,%3
> bnez %0,2f
> li %1,1
> sc %1,%2
> beqz %1,1b
> 2:
But note that the ll instruction is MIPS ISA II, which means that it
is not supported by the R3000, which means that it will not work on
most DECstations.
I don't think there is any way to do a reliable test-and-set sequence
in user mode on an R3000.
Ian
