setpriority

• setpriority WHICH,WHO,PRIORITY

  Sets the current priority for a process, a process group, or a user. (See setpriority(2).) Raises an exception when used on a machine that doesn't implement setpriority(2).

  WHICH can be any of PRIO_PROCESS , PRIO_PGRP or PRIO_USER imported from RESOURCE CONSTANTS in POSIX.

  Portability issues: setpriority in perlport.