> > Export the existance of ll/sc via /proc/cpuinfo or whatever.
>
> That's a valid approach and also nothing new to glibc -- see Alpha and
> in()/out() support. But do we want an extra overhead due to an indirect
> call? Especially as _test_and_set() gets usually inlined?
Use a global variable testable by the inline code?
> > I dont think this is true necessarly - There are still people building
> > embedded x86 systems based on 386 cores. Look at the vr41xx systems -
They
> > do also lack the ll/sc afaik. This is nowadays the most commonly
> > used embedded/pda cpu.
>
> Are vr41xx plain ISA I or crippled ISA II+ CPUs?
Actually, they are crippled MIPS III+ 64-bit CPUs
(with added stuff like16x16 bit MAC instructions!).
Kevin K.
