pclocks - returns POSIX clocks for real, user, system time
pclocks -> [rclocks uclocks sclocks cuclocks csclocks]
Calls the POSIX times() function to obtain real, user,
and system time clock counts, as well as user and system time clock
counts for all children. Real time clocks have arbitrary origin,
i.e., only differences are meaningful.
See man times(3) for details.
Note: results for user and system time may not be reliable if more
than one thread is used.
man 2 times
Hans Ekkehard Plesser
2003-07-29, based on Ptimesfunction
/var/www/debian/nest/nest-simulator-2.20.0/sli/slicontrol.cc