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Another step to windows and other platforms port is threads, locks, and so
on.
This file contains 3 alternative threads-stuff:
1) threads_no: no locking is done (but now there is no need in #ifdef
anywhere else than threads.h)
2) threads_p: original pthreads locking (but now all locks are scoped, i.e.
wrapped in a class)
3) threads_b: wrapped boost::threads, so you'll need boost::thread lib
(which is available for win of course)