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Re: ARM: enable interpreter, add locks code
Daniel Jacobowitz writes:
> On Wed, Jul 11, 2007 at 12:58:28PM -0700, David Daney wrote:
> > Andrew Haley wrote:
> >
> > > +/* Atomic compare and exchange. These sequences are not actually
> > > + atomic; there is a race if *ADDR != OLD_VAL and we are preempted
> > > + between the two swaps. However, they are very close to atomic, and
> > > + are the best that a pre-ARMv6 implementation can do without
> > > + operating system support. LinuxThreads has been using these
> > > + sequences for many years. */
> >
> > Wow! That is terrible.
>
> Actually it works very well :-)
>
> > Is there some way to do proper synchronization if the target CPU supports it?
>
> You would have to configure gcc specifically for an armv6 or armv7
> processor, or add relevant multilibs.
We could do that. Do you have a pointer to the equivalent armv6 or
armv7 code?
Andrew.