[infinispan-dev] JGroupsDistSync and ISPN-83
Manik Surtani
msurtani at redhat.com
Fri May 13 10:53:36 EDT 2011
Yes, please have a look. If we are relying on lock upgrades then that's really bad. I am aware of the inability to (safely) upgrade a RWL and I'm pretty sure we don't try, but the dist sync codebase has evolved a lot and could do with some careful analysis.
Sent from my mobile phone
On 12 May 2011, at 09:24, Vladimir Blagojevic <vblagoje at redhat.com> wrote:
> On 11-05-11 11:23 AM, Dan Berindei wrote:
>> If ReentrantReadWriteLock would allow upgrades then you would get a
>> deadlock when two threads both hold the read lock and try to upgrade
>> to a write lock at the same time.
>> There's always a trade-off...
>>
>> I'm not familiar with the code, but are you sure the read lock is
>> being held by the same thread that is trying to acquire the write
>> lock?
>>
>
> Not sure and it sounds counter intuitive that a thread holding a read
> lock from cluster invocation is doing state generation for state
> transfer as well. But this lock business is fishy and I plan to get to
> the bottom of it...
>
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