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Unix Version 7 - man page for nice (v7 section 2)

NICE(2) 					 System Calls Manual					      NICE(2)

NAME
nice - set program priority
SYNOPSIS
nice(incr)
DESCRIPTION
The scheduling priority of the process is augmented by incr. Positive priorities get less service than nor- mal. Priority 10 is recommended to users who wish to execute long-running programs without flak from the administration. Negative increments are ignored except on behalf of the super-user. The priority is limited to the range -20 (most urgent) to 20 (least). The priority of a process is passed to a child process by fork(2). For a privileged process to return to nor- mal priority from an unknown state, nice should be called successively with arguments -40 (goes to priority -20 because of truncation), 20 (to get to 0), then 0 (to maintain compatibility with previous versions of this call).
SEE ALSO
nice(1)
ASSEMBLER
(nice = 34.) (priority in r0) sys nice NICE(2)


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