RFR(S): 8213436: Obsolete UseMembar

[David Holmes]

Hi Mikael,

It is good to see a lot of complex code removed.

Reviewed.

Thanks,
David

On 7/11/2018 7:00 AM, Mikael Vidstedt wrote:
> 
> Please review this change which obsoletes the UseMembar flag and removes the code that then becomes unreachable/dead.
> 
> bug: https://bugs.openjdk.java.net/browse/JDK-8213436 <https://bugs.openjdk.java.net/browse/JDK-8213436>
> webrev: http://cr.openjdk.java.net/~mikael/webrevs/8213436/webrev.00/open/webrev/ <http://cr.openjdk.java.net/~mikael/webrevs/8213436/webrev.00/open/webrev/>
> 
> * Background (from jbs)
> 
> The UseMembar flag was deprecated in JDK 10, and is default true/enabled on all platforms since that same release. It should be obsoleted and the then dead serialization page functionality it controls should be removed.
> 
> 
> * Testing
> 
> tier1. If anybody wants to take it for a spin on aarch64/ppc/s390/x86_32 that wouldn’t hurt.
> 
> 
> (Unrelated to this change: It would be really nice to clean up some of the (mostly) duplicated code in the os/signal handling area...)
> 
> Cheers,
> Mikael
>