RFC: CACAO PR157 ARM memory barrier patch

[Xerxes Rånby]

On 2011-03-11 16:06, Matthias Klose wrote:
> On 11.03.2011 14:59, Xerxes Rånby wrote:
>> Hi
>>
>> The attached patch makes CACAO SMP safe on ARM by fixing
>> CACAO PR157: ARM SMP Assertion thinlock failed.
>> http://server.complang.tuwien.ac.at/cgi-bin/bugzilla/show_bug.cgi?id=157
>>
>> Ok to push to IcedTea6 HEAD and 1.10 branch?
> please could you make this check depending on the compiler version used? As it
> is not in 4.5.x fsf, the safe version to check would be 4.6.0.
>
>   Matthias
No, i dont think making this dependent on the compiler version would work.
For what i know

__asm__ __volatile__ ("" : : : "memory");

do not generate any code and do not work as a memory barrier on ARM for any GCC version.

Xerxes