Request for Review(xs) - 8155263: DisableStartThread should not be applied to GC worker threads

[Jon Masamitsu]

Yes, Thomas, you guessed correctly.  And so others don't have to guess.

http://cr.openjdk.java.net/~jmasa/8155263/webrev.00/

Thanks.

Jon

On 7/12/2016 10:37 AM, Jon Masamitsu wrote:
> https://bugs.openjdk.java.net/browse/JDK-8155263
>
> The flag DisableStartThread is defined for Java threads
>
>   develop(bool, DisableStartThread, false, \
>           "Disable starting of additional Java threads " \
>           "(for debugging only)")
>
> but was being applied to GC threads in one case.  I removed
> that use.
>
> Tested by comparing the GC threads before and after the
> change to verify that the concurrent GC threads were running.
>
> Using +DisableStartThread on the command line cause the Java
> threads not to run and under those circumstances a safepoint
> is not reached (Java threads never get there).  Any of the test
> programs I tried hung at the first GC.
>
> Thanks.
>
> Jon
>