pset_create, pset_destroy, pset_assign - manage sets of pro-
int pset_create(psetid_t *newpset);
int pset_destroy(psetid_t pset);
int pset_assign(psetid_t pset, processorid_t cpu, psetid_t
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.
The pset_destroy() function destroys the processor set pset,
releasing its constituent processors and processes. If pset
is PS_MYID, the processor set to which the caller is bound
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 pro-
On successful return, if opset is non-null, opset will con-
tain the processor set ID of the former processor set of the
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 pro-
cessor sets, but returns the current processor set ID of
processor cpu in opset.
If pset is PS_MYID, processor cpu is assigned to the proces-
sor set to which the caller belongs. If the caller does not
belong to a processor set, processor cpu is released from
its current processor set.
These functions are restricted to super-user use, except for
pset_assign() when pset is PS_QUERY.
Upon successful completion, these functions return 0. Other-
wise, -1 is returned and errno is set to indicate the error.
These functions will fail if:
EBUSY The processor could not be moved to the specified pro-
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.
The specified processor does not exist, the specified
processor is not on-line, or an invalid processor set
There was insufficient space for pset_create to create
a new processor set.
EPERM The effective user of the calling process is not
See attributes(5) for descriptions of the following attri-
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
| Interface Stability | Stable |
| MT-Level | Async-Signal-Safe |
psradm(1M), psrinfo(1M), psrset(1M), p_online(2),
processor_bind(2), pset_bind (2), pset_info(2),
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.
Man(1) output converted with