From: loufoque (mathias.gaunard_at_[hidden])
Date: 2006-09-21 20:10:00
Mateusz Loskot wrote :
> Today, my friend was told (warned) on the #c++ IRC channel that
> Boost uses some technologies already patented by IBM (and may be other
> entities), like RCU or SMR (and may be more).
I think I saw part of that discussion.
It actually started about the cost of reference counting in
Then it was said that using technologies such as RCU and SMR could
improve performance, but given that those are patented , they
couldn't be used in boost::shared_ptr.
I do not know how this discussion transformed into patents being used in
Since I don't really know myself how RCU and SMR work, I am unable to
give more info but if you're interested you could search for "RCU SMR"
in Google groups which seems to bring interesting results in
comp.programming.threads and comp.lang.c++.moderated about this kind of
 It seems, though, that IBM has authorized the use of RCU in GPL'ed
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