[concurrency-interest] Special Conditions and PriorityBlockingQueue

Doug Lea dl at cs.oswego.edu
Mon Sep 25 13:15:50 EDT 2006


David Walend wrote:
> 
> Is there a way to remove a Condition once Lock.newCondition() has  
> been called? 

No.

> If not, how much overhead does the Condition take if  
> it's never .signal()ed?

Not much -- when there are no waiters, Conditions just
maintain a few bookkeeping fields.
And they are GCable once unreferenced.
And they are also pretty cheap to construct.

I don't recall anyone ever exploiting all this to build
something with lots of dynamically created Conditions, but
I can't think of any reason not to try.

-Doug


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