FreeBSD's man page for setitimer/getitimer doesn't look different from
the one in Linux. 
But.. both tests assumes the computer is not so fast that it finishes
"for i in xrange(100000000)" before the timer expire, maybe it was not
the case in that machine. Both timers (virtual and prof) are set to
expire after 0.2 seconds, and for itimer_virtual it restarts the timer 3
times before setting it to 0.
If someone has a freebsd machine (a fast one apparently) that could run
some tests and help me on this, it would be very nice.

Also sorry for various typos in my last message.