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).

Portability issues: setpriority in perlport.

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http://perldoc.perl.org/5.20.2/functions/setpriority.html