[aarch64-port-dev ] RFR(XS): 8167421: AArch64: in one core system, fatal error: Illegal threadstate encountered

[Andrew Haley]

On 16/10/16 21:50, David Holmes wrote:

> including the difference between using DSB and DMB for the barrier?

DSB was a mistake.  I wrote this code before I understood the
difference between DSB and DSB; only DMB is needed here.  The
documentation we had was rather thin on detail Also, the line above
which changes thread_state uses STLRW, a fully sequentially-consistent
store, so I don't think that any of the code within os::is_MP() is
needed at all.

I have noticed these anomalies before, but didn't do anything because
it's delicate code and very difficult to test.  This might be a good
time to correct both versions.

Andrew.