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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.