Unix and Linux Discussions Tagged with nice |
|
Thread / Thread Starter |
Last Post |
Replies |
Views |
Forum |
|
|
|
3 |
5,304 |
UNIX for Advanced & Expert Users |
|
|
|
3 |
4,232 |
Shell Programming and Scripting |
|
|
|
5 |
13,726 |
HP-UX |
|
|
|
0 |
4,815 |
UNIX and Linux RSS News |
|
|
|
13 |
7,709 |
UNIX for Dummies Questions & Answers |
|
|
|
4 |
3,809 |
UNIX for Advanced & Expert Users |
|
|
|
1 |
2,819 |
Programming |
|
|
|
2 |
5,452 |
UNIX for Dummies Questions & Answers |
|
|
|
6 |
4,125 |
UNIX for Dummies Questions & Answers |
|
|
|
1 |
11,802 |
UNIX for Dummies Questions & Answers |
|
|
|
3 |
2,853 |
UNIX for Dummies Questions & Answers |
|
|
|
6 |
4,491 |
UNIX for Dummies Questions & Answers |
|
|
|
2 |
2,287 |
UNIX for Dummies Questions & Answers |
|
|
|
1 |
4,612 |
UNIX for Dummies Questions & Answers |
|
|
|
2 |
2,764 |
Post Here to Contact Site Administrators and Moderators |
|
|
|
3 |
5,519 |
UNIX for Dummies Questions & Answers |
|
|
|
1 |
4,018 |
UNIX for Dummies Questions & Answers |
|
|
|
1 |
2,913 |
UNIX for Dummies Questions & Answers |
|
|
|
7 |
5,020 |
UNIX for Dummies Questions & Answers |
|
|
|
2 |
3,697 |
Cybersecurity |
|
|
|
1 |
2,449 |
UNIX for Dummies Questions & Answers |
|
|
|
7 |
4,435 |
UNIX for Dummies Questions & Answers |
|
|
|
5 |
8,977 |
Programming |
|
|
|
2 |
2,114 |
UNIX for Dummies Questions & Answers |
|
|
|
2 |
2,292 |
UNIX for Dummies Questions & Answers |
|
|
|
12 |
8,907 |
UNIX for Dummies Questions & Answers |
|
|
|
4 |
10,055 |
UNIX for Dummies Questions & Answers |
|
|
|
1 |
3,074 |
Post Here to Contact Site Administrators and Moderators |
|
|
|
3 |
2,302 |
UNIX for Dummies Questions & Answers |
|
|
|
1 |
4,609 |
UNIX for Dummies Questions & Answers |
|
|
|
4 |
3,663 |
UNIX for Dummies Questions & Answers |
|
|
|
4 |
4,881 |
UNIX for Dummies Questions & Answers |
|
|
|
5 |
2,951 |
UNIX for Dummies Questions & Answers |
|
|
|
3 |
5,059 |
UNIX for Dummies Questions & Answers |
|
|
|
4 |
8,945 |
Cybersecurity |
|
|
|
1 |
3,064 |
Post Here to Contact Site Administrators and Moderators |
|
|
|
2 |
3,035 |
UNIX for Dummies Questions & Answers |
nice(2) System Calls nice(2)
NAME
nice - change priority of a process
SYNOPSIS
#include <unistd.h>
int nice(int incr);
DESCRIPTION
The nice() function allows a process to change its priority. The invoking process must be in a scheduling class that supports the nice().
The nice() function adds the value of incr to the nice value of the calling process. A process's nice value is a non-negative number for
which a greater positive value results in lower CPU priority.
A maximum nice value of (2 * NZERO) -1 and a minimum nice value of 0 are imposed by the system. NZERO is defined in <limits.h> with a
default value of 20. Requests for values above or below these limits result in the nice value being set to the corresponding limit. A nice
value of 40 is treated as 39.
Calling the nice() function has no effect on the priority of processes or threads with policy SCHED_FIFO or SCHED_RR.
Only a process with the {PRIV_PROC_PRIOCNTL} privilege can lower the nice value.
RETURN VALUES
Upon successful completion, nice() returns the new nice value minus NZERO. Otherwise, -1 is returned, the process's nice value is not
changed, and errno is set to indicate the error.
ERRORS
The nice() function will fail if:
EINVAL The nice() function is called by a process in a scheduling class other than time-sharing or fixed-priority.
EPERM The incr argument is negative or greater than 40 and the {PRIV_PROC_PRIOCNTL} privilege is not asserted in the effective set of
the calling process.
USAGE
The priocntl(2) function is a more general interface to scheduler functions.
Since -1 is a permissible return value in a successful situation, an application wishing to check for error situations should set errno to
0, then call nice(), and if it returns -1, check to see if errno is non-zero.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Interface Stability |Standard |
+-----------------------------+-----------------------------+
|MT-Level |Async-Signal-Safe |
+-----------------------------+-----------------------------+
SEE ALSO
nice(1), exec(2), priocntl(2), getpriority(3C), attributes(5), privileges(5), standards(5)
SunOS 5.11 1 Apr 2004 nice(2)