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

Jon Masamitsu jon.masamitsu at oracle.com
Tue Jul 19 17:47:48 UTC 2016


Thanks, Thomas, for the Review.

I still need one more review, please.

Jon

On 7/12/2016 11:49 AM, Jon Masamitsu wrote:
> 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
>>
>



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