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.\"     @(#)nice.3	8.1 (Berkeley) 6/4/93
.\"
.\" $FreeBSD$
.Dd June 4, 1993
.Dt NICE 3
.Os BSD 4
.Sh 名称
.Nm nice
.Nd プログラムのスケジューリング優先度の設定
.Sh 書式
.Fd #include <unistd.h>
.Ft int
.Fn nice "int incr"
.Sh 解説
.Bf -symbolic
このインタフェースは、setpriority(2)
で置き換えられました。
.Ef
.Pp
.Fn nice
関数は、そのプロセスのスケジューリング優先度をシステムから入手し、
.Fa incr
で指定する優先度の値に設定します。優先度の有効範囲は、-20 から 20 です。
デフォルトの優先度は 0 です。優先度を下げると、スケジューリングが
良くなります。優先度を下げられるのは、スーパユーザのみです。
.Pp
子プロセスは、
.Xr fork 2
を通じて親プロセスの優先度を継承します。
.Sh 関連項目
.Xr nice 1 ,
.Xr fork 2 ,
.Xr setpriority 2 ,
.Xr renice 8
.Sh 歴史
.Fn nice
は、
.At v6
で追加されました。
.\"kuma 1999-11-12