RFR(XL): 8167108 - SMR and JavaThread Lifecycle

[coleen.phillimore at oracle.com]

Hi,  From my initial look at this, I really like new interface for 
walking the threads list, except every instance but 2 uses of 
JavaThreadIterator has a preceding ThreadsListHandle declaration.

+  ThreadsListHandle tlh;
+  JavaThreadIterator jti(tlh.list());


Could there be a wrapper that embeds the ThreadsListHandle, like:

class JavaThreadsListIterator {
     ThreadsListHandle _tlh;
...
}

Thanks,
Coleen

On 10/9/17 3:41 PM, Daniel D. Daugherty wrote:
> Greetings,
>
> We have a (eXtra Large) fix for the following bug:
>
> 8167108 inconsistent handling of SR_lock can lead to crashes
> https://bugs.openjdk.java.net/browse/JDK-8167108
>
> This fix adds a Safe Memory Reclamation (SMR) mechanism based on
> Hazard Pointers to manage JavaThread lifecycle.
>
> Here's a PDF for the internal wiki that we've been using to describe
> and track the work on this project:
>
> http://cr.openjdk.java.net/~dcubed/8167108-webrev/SMR_and_JavaThread_Lifecycle-JDK10-04.pdf 
>
>
> Dan has noticed that the indenting is wrong in some of the code quotes
> in the PDF that are not present in the internal wiki. We don't have a
> solution for that problem yet.
>
> Here's the webrev for current JDK10 version of this fix:
>
> http://cr.openjdk.java.net/~dcubed/8167108-webrev/jdk10-04-full
>
> This fix has been run through many rounds of JPRT and Mach5 tier[2-5]
> testing, additional stress testing on Dan's Solaris X64 server, and
> additional testing on Erik and Robbin's machines.
>
> We welcome comments, suggestions and feedback.
>
> Daniel Daugherty
> Erik Osterlund
> Robbin Ehn