Now includes -C, -i, and -R options
for manipulating the runmask, and -T for identifying the
thread that you want to send a signal to or whose runmask or priority
you want to change. Also includes -m option to restrict the match.
-P without -T now affects all threads in the
specified process or processes.
Previously it affected only thread 1.
This utility now matches process IDs or names; you can
use the new -m option to limit which it matches.