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