Adding a new thread model to GCC

[Eric Botcazou]

> could you please refresh/recheck your patch for the current gcc master
> and solve the objections noted in the thread? is it possible?

I can do the former, but not the latter as my development setup (mostly 
testing) on Windows has nearly vanished in the meantime.  But this rewritten 
implementation is the one used by the C/C++/Ada compilers from AdaCore.

-- 
Eric Botcazou