50301bb0a1
Fix the rtprio option that for some reason was progessively becoming an option showing the priority class of threads. In particular: - use the constants defined in sys/sys/rtprio.h instead of those defined in sys/sys/priority.h: this helps making clearer that the code actually is about realtime priorities and not standard scheduler priorities; - remove the PRI_ITHD case that has nothing to do with realtime priorities; - convert the priority levels to realtime priority levels using the same formulas used for pri_to_rtp function in sys/kern/kern_resource.c. - remove outdated note "101 = not a realtime process" in the man page and replace it with a more useful reference to man 1 rtprio. Approved by: src (mckusick), manpages (bcr), gerald (mentor) MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D25266
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