[concurrency-interest] Backport limitations

[Dawid Kurzyniec]

Mike Skells wrote:
> Hi
> I noticed (which backporting some code) that the semaphores do not 
> allow for multi acquires
>  
> Is there a specific reason for this is it just lack of dev resources. 
> I use this is current J5 code and I am looking to not try to rewrite 
> that code to do the backport
It is the latter (dev resources), plus it seemed low priority comparing 
to other things. I didn't have time to sit and analyze how the j.u.c. 
implementation avoids the risk of deadlock / starvation, which I suppose 
it must do at least for fair semaphores.

I'll try to look into this soon.
Regards,
Dawid