RFR: 8202649: Move the Parallel GC specific task creation functions out of Threads

[Per Liden]

On 05/07/2018 04:02 PM, Stefan Karlsson wrote:
> Hi all,
> 
> Please review this patch to move the Parallel GC specific task creation 
> functions out of Threads.
> 
> http://cr.openjdk.java.net/~stefank/8202649/webrev.01/

Looks good!

/Per

> 
> There exist (at least) two available functions to iterate over a subset 
> of threads:
>   static void non_java_threads_do(ThreadClosure* tc);
>   static void threads_do(ThreadClosure* tc);
> 
> This patch extends this set and adds:
>   static void java_threads_do(ThreadClosure* tc);
>   static void java_threads_and_vm_thread_do(ThreadClosure* tc);
> 
> The latter is used to implement the create_thread_roots_tasks and 
> create_thread_roots_marking_tasks inside the Parallel GC code.
> 
> Thanks,
> StefanK