RFR (S): JDK-8076225: Move the thread claim parity from SharedHeap to Thread

[Bengt Rutisson]

On 2015-03-30 15:40, Jesper Wilhelmsson wrote:
> Looks good.

Thanks, Jesper!

>
> I assume you count yourself as a Reviewer(?)

Yes, so unless anyone else looks at this and complains I'll push it 
tomorrow :)

Thanks,
Bengt

> /Jesper
>
>
> Bengt Rutisson skrev den 30/3/15 13:27:
>>
>> Hi everyone,
>>
>> This patch was contributed by Mikael Gerdin, I'm mostly just 
>> shepherding this
>> patch in to the repo.
>>
>> http://cr.openjdk.java.net/~brutisso/8076225/webrev.00/
>> https://bugs.openjdk.java.net/browse/JDK-8076225
>>
>>  From the bug report:
>>
>> The thread claim parity is used to parallelize the scanning of root 
>> in the
>> JavaThreads. This was placed in SharedHeap, but used by the Thread class
>> (Threads::possibly_parallel_oops_do()). Moving this claiming state 
>> into the
>> Thread class will collect the state information and the usage in one 
>> place. It
>> will also anther step towards eventually being able to remove 
>> SharedHeap.
>>
>>
>> Apart from just moving the claiming state, Mikael also added an 
>> assert that
>> verifies that all Java threads have the correct parity after a GC. 
>> This is to
>> quickly find out if anybody forgets to handle the Java threads during 
>> root
>> processing at some point.
>>
>> Thanks,
>> Bengt
>>