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nice(3) [osx man page]

NICE(3) 						   BSD Library Functions Manual 						   NICE(3)

nice -- set program scheduling priority LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <unistd.h> int nice(int incr); DESCRIPTION
This interface is obsoleted by setpriority(2). The nice() function obtains the scheduling priority of the process from the system and sets it to the priority value specified in incr. The priority is a value in the range -20 to 20. The default priority is 0; lower priorities cause more favorable scheduling. Only the super- user may lower priorities. Children inherit the priority of their parent processes via fork(2). SEE ALSO
nice(1), fork(2), setpriority(2), renice(8) HISTORY
A nice() syscall appeared in Version 6 AT&T UNIX. BSD
June 4, 1993 BSD

Check Out this Related Man Page

nice(3) 						     Library Functions Manual							   nice(3)

       nice - set program priority

       int nice(incr)
       int incr;

       The scheduling priority of the process is augmented by incr.  Positive priorities get less service than normal.	Priority 10 is recommended
       to users who wish to execute long-running programs without flack 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 For a privileged process to return to normal  priority  from  an  unknown  state,
       should  be  called successively with arguments -40 (goes to priority -20 because of truncation), 20 (to get to 0), then 0 (to maintain com-
       patibility with previous versions of this call).

       In any mode, nice returns -1 and sets on an error.  On success, the return value depends on the mode in which your  program  was  compiled.
       In  POSIX  or  System V mode, it is the new priority; otherwise, it is zero.  Note that, in POSIX and System V mode, -1 can indicate either
       success or failure; must be used to determine which.

See Also
       nice(1), fork(2), setpriority(2), renice(8)

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