RFR (XS): 8165860: workgroup classes are missing volatile qualifiers for lock-free code
erik.osterlund at oracle.com
Mon Sep 19 15:01:00 UTC 2016
Thanks for the review!
On 2016-09-19 15:50, Mikael Gerdin wrote:
> Hi Erik,
> On 2016-09-19 15:48, Erik Österlund wrote:
>> Mikael Gerdin noticed a compiler workaround could be done in a
>> nicer-looking way.
>> So here goes a new webrev. Thanks, Mikael.
>> Incremental webrev:
>> Full webrev: http://cr.openjdk.java.net/~eosterlund/8165860/webrev.01/
> Much better, looks good to me now.
>> Tested with JPRT.
>> On 2016-09-19 12:28, Erik Österlund wrote:
>>> This bug is a split out of the larger JDK-8033552 for adding volatile
>>> qualifiers to lock-free code.
>>> The motivation is to make our implementation more robust since these
>>> kind of issues have struck us a few times too many already.
>>> CR: https://bugs.openjdk.java.net/browse/JDK-8165860
>>> Webrev: http://cr.openjdk.java.net/~eosterlund/8165860/webrev.00/
>>> This specific CR handles the lack of volatile qualifiers in the
>>> SubTasksDone and SequentialSubTasksDone classes in the workgroup.*
>>> SubTasksDone is missing volatile on the _tasks and _threads_completed
>>> fields that are changed concurrently with atomics.
>>> SequentialSubTasksDone is missing volatile on the _n_claimed and
>>> _n_completed fields that are changed concurrently with atomics.
>>> Testing: JPRT
>>> I will need a sponsor to push this.
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