[boost] Moving Boost.Thread barrier from thread_dev to HEAD

From: Michael Glassford (glassfordm_at_[hidden])
Date: 2004-02-16 12:01:33

The thread_dev branch in CVS contains a barrier class that I would like 
to move to the main branch, as has recently been requested by more than 
one Booster. Is anyone aware of any problems that should be addressed 
before this happens? For reference, see

thread.hpp, 
http://cvs.sourceforge.net/viewcvs.py/*checkout*/boost/boost/boost/thread/Attic/barrier.hpp?content-type=text%2Fplain&rev=1.1.4.3

and

thread.cpp, 
http://cvs.sourceforge.net/viewcvs.py/*checkout*/boost/boost/libs/thread/src/Attic/barrier.cpp?content-type=text%2Fplain&rev=1.1.4.2 

One potential problem that I am aware of is that it is possible for the 
m_generation counter (see barrier.cpp) to overflow on systems that 
detect overflow of integer addition instead of wrapping (I assume there 
are such systems though I've never used one). Is it worthwhile checking 
for this and forcing wrapping in code?

Mike