Re: userspace spinlocks

[Jun Sun <jsun@mvista.com>]

Florian Lohoff wrote:
> 
> OTOH - Where are they normally implemented ? libc ? macro ? 

As far I know, they ether use atomic instructions such as ll/sc or use
kernel trap to emulate atomic operations.  I am not sure if other means
are possible because userland cannot disable interrupts or prevent
context switch.

> Could
> there be a runtime linking thing with a cpu detection wether we
> have ll/sc or not ?
>

This is a wonderful idea.  It should incorporate into future MIPS CPU
support structure.
 
Jun