Technical Reference: Base Operating System and Extensions, Volume 2

rs_setpartition Subroutine

Purpose

Sets the partition resource set of a process.

Library

Standard C library (libc.a)

Syntax

#include <sys/rset.h>
int rs_setpartition(pid, rset, flags)
pid_t pid;
rsethandle_t rset;
unsigned int flags;

Description

The rs_setpartition subroutine sets a process' partition resource set. The subroutine can also be used to remove a process' partition resource set.

The partition resource set limits the threads in a process to running only on the processors contained in the partition resource set.

The work component is an existing process identified by the process ID. A process ID value of RS_MYSELF indicates the attachment applies to the current process.

The following conditions must be met to set a process' partition resource set:

The calling process must have root authority.
The resource set must contain processors that are available in the system.
The new partition resource set must be equal to, or a superset of the target process' effective resource set.
The target process must not contain any threads that have bindprocessor bindings to a processor.

Parameters

pid	Specifies the process ID of the process whose partition resource set is to be set. A value of RS_MYSELF indicates the current process' partition resource set should be set.
rset	Specifies the partition resource set to be set. A value of RS_DEFAULT indicates the process' partition resource set should be removed.
flags	Reserved for future use. Specify as 0.

Return Values

If successful, a value of 0 is returned. If unsuccessful, a value of -1 is returned, and the errno global variable is set to indicate the error.

Error Codes

The rs_setpartition subroutine is unsuccessful if one or more of the following are true:

EINVAL	The flags parameter contains an invalid value.
ENODEV	The resource set specified by the rset parameter does not contain any available processors.
ESRCH	The process identified by the pid parameter does not exist.
EFAULT	Invalid address.
ENOMEM	Memory not available.
EPERM	One of the following is true: The calling process does not have root authority. The process identified by the pid parameter has one or more threads with a bindprocessor processor binding. The process identified by the pid parameter has an effective resource set and the new partition resource set identified by the rset parameter does not contain all of the effective resource set's resources.

Related Information

rs_getpartition Subroutine and ra_attachrset Subroutine.