pset_assign(2)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | SEE ALSO | NOTES

NAME

pset_create, pset_destroy, pset_assign- manage sets of processors

SYNOPSIS

#include <sys/pset.h>

int pset_create(psetid_t *newpset);
int pset_destroy(psetid_t pset);
int pset_assign(psetid_t pset, processorid_t cpu, psetid_t *opset);

DESCRIPTION

These functions control the creation and management of sets of processors. Processor sets allow a subset of the system's processors to be set aside for exclusive use by specified LWPs and processes. The binding of LWPs and processes to processor sets is controlled by pset_bind(2).

The pset_create() function creates an empty processor set that contains no processors. On successful return, newpset will contain the ID of the new processor set.

Only a limited number of processor sets may be active (created and not destroyed) at a given time. This limit will always be greater than the number of processors in the system. If pset_create() is called when the maximum number of processor sets is already active, the function will return -1 and errno will be set to ENOMEM.

The pset_destroy() function destroys the processor set pset, releasing its constituent processors and processes.

The pset_assign() function assigns the processor cpu to the processor set pset. A processor that has been assigned to a processor set will run only LWPs and processes that have been explicitly bound to that processor set, unless another LWP requires a resource that is only available on that processor. On successful return, if opset is non-null, opset will contain the processor set ID of the former processor set of the processor.

If pset is PS_NONE, pset_assign() releases processor cpu from its current processor set.

If pset is PS_QUERY, pset_assign() makes no change to processor sets, but returns the current processor set ID of processor cpu in opset.

These functions are restricted to super-user use, except for pset_assign() when pset is PS_QUERY.

RETURN VALUES

Upon successful completion, these functions return 0. Otherwise, -1 is returned and errno is set to indicate the error.

ERRORS

These functions will fail if:

EBUSY

The processor could not be moved to the specified processor set.

EFAULT

The location pointed to by newpset was not writable by the user, or the location pointed to by opset was not NULL and not writable by the user.

EINVAL

The specified processor does not exist, the specified processor is not on-line, or an invalid processor set was specified.

ENOMEM

There was insufficient space for pset_create to create a new processor set.

EPERM

The effective user of the calling process is not super-user.

SEE ALSO

psradm(1M), psrinfo(1M), psrset(1M), p_online(2), processor_bind(2), pset_bind (2), pset_info(2)

NOTES

Processors belonging to different processor sets of type PS_SYSTEM (see pset_info(2)) cannot be assigned to the same processor set of type PS_PRIVATE. If this is attempted, pset_assign() will fail and set errno to EINVAL.

Processors with LWPs bound to them using processor_bind(2) cannot be assigned to a new processor set. If this is attempted, pset_assign() will fail and set errno to EBUSY.

SunOS 5.8  Last Revised 10 Jan 1997

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | ERRORS | SEE ALSO | NOTES