RFR 8184732: Deadlock detection improvements for 'special' locks

[Erik Österlund]

Hi Coleen,

Looks good to me. Thanks for taking care of it.

/Erik

On fredag 27 september 2019 kl. 20:20:34 CEST coleen.phillimore at oracle.com 
wrote:
> Summary: Assert that special ranked locks cannot safepoint and
> allow_vm_block and remove locks from the exceptional lock
> list in no_safepoint_verifier.
> 
> The Compile_lock shouldn't be used by the VM thread or it would
> deadlock.   Implemented most of the suggestions in the RFE.  Many have
> already been cleaned up.
> 
> Tested with tier1 on all Oracle platforms, and tier2-6 on linux-x64, and
> new test.
> 
> open webrev at http://cr.openjdk.java.net/~coleenp/2019/8184732.01/webrev
> bug link https://bugs.openjdk.java.net/browse/JDK-8184732
> 
> Thanks,
> Coleen