NAME
pset_ctl() — processor set control
SYNOPSIS
#include <sys/pset.h>
int pset_ctl(
pset_request_t request,
psetid_t pset,
id_t id);
DESCRIPTION
The
pset_ctl()
function provides a means to query the system processor set
configuration and assignment information.
The
request
argument specifies what information is needed for the
pset
processor set.
The following
request
values are supported:
- PSET_GETCURRENTPSET
Return the ID of the processor set binding for the calling thread.
The
pset
and
id
arguments are ignored.
- PSET_GETFIRSTLDOM
Return the ID of the first locality domain contributing to the processor set
pset.
The
id
argument is ignored.
- PSET_GETFIRSTPSET
Return the ID of the first processor set in
the system.
The
pset
and
id
arguments are ignored.
- PSET_GETFIRSTSPU
Return the ID of the first processor in the processor set
pset.
It will return -1 if the processor set is empty.
Any processors in the processor set that is in transition are ignored.
The
id
argument is ignored.
- PSET_GETNEXTLDOM
Return the ID of the next locality domain after the locality domain specified in
id
that contributes to the processor set
pset.
Typically,
PSET_GETFIRSTLDOM
is called to determine the first locality domain in a processor set.
PSET_GETNEXTLDOM
is then called in a loop (until the call returns -1)
to determine the IDs of the remaining locality domain in the processor set.
- PSET_GETNEXTPSET
Return the ID of the next processor set in the system after
pset.
The
id
argument is ignored.
Typically,
PSET_GETFIRSTPSET
is called to determine the first processor set.
PSET_GETNEXTPSET
is then called in a loop (until the call returns -1)
to determine the IDs of the remaining processor sets in the system.
- PSET_GETNEXTSPU
Return the ID of next processor in the processor set
pset
after the processor specified in
id.
Typically,
PSET_GETFIRSTSPU
is called to determine the first processor in a processor set.
PSET_GETNEXTSPU
is then called in a loop (until the call returns -1)
to determine the IDs of the remaining processors in the processor set.
- PSET_GETNUMLDOMS
Return the number of locality domains that have at least one processor
assigned to the processor set
pset.
The
id
argument is ignored.
- PSET_GETNUMPSETS
Return the current number of processor sets in the system.
It will always be greater than or equal to one.
The
pset
and
id
arguments are ignored.
- PSET_GETNUMSPUS
Return the number of processors assigned to the processor set
pset.
Any processors in the processor set that is in transition are not included.
The
id
argument is ignored.
- PSET_LDOMSPUS
Return number of processors contributed by the locality domain specified by
id
to the processor set
pset.
- PSET_SPUTOPSET
Return the ID of the processor set assigned for the processor specified in
id.
If the processor is not enabled or is in transition from one processor set
to another, -1 is returned with an error.
The
pset
argument is ignored.
Any user may query the system processor set topology using the
pset_ctl()
function.
Use
sysconf()
with
_SC_PSET_SUPPORT
name to see if the processor set functionality is supported by the underlying
HP-UX operating system version.
EXAMPLES
Get total count and IDs of all processor sets in the system.
#include <sys/pset.h>
/*
* Get list of all processor sets in the system.
*/
psetid_t *all_psets;
int pset_count, idx;
psetid_t pset;
/* Get total count of processor sets in the system */
pset_count = pset_ctl(PSET_GETNUMPSETS, 0, 0);
if (pset_count < 1) {
perror("pset_ctl(PSET_GETNUMPSETS)");
exit(1);
}
all_psets = (psetid_t *) malloc(sizeof(psetid_t)*pset_count);
memset(all_psets, 0, sizeof(psetid_t)*pset_count);
idx = 0;
/* Get first processor set */
pset = pset_ctl(PSET_GETFIRSTPSET, 0, 0);
if (pset < 0) {
perror("pset_ctl(PSET_GETFIRSTPSET)");
exit(2);
}
all_psets[idx++] = pset;
/* Get remaining processor sets */
while (idx < pset_count) {
pset = pset_ctl(PSET_GETNEXTPSET, pset, 0);
if (pset < 0) {
perror("pset_ctl(PSET_GETNEXTPSET)");
exit(3);
} else {
all_psets[idx++] = pset;
}
}
RETURN VALUE
pset_ctl()
returns a value based on
request
on successful completion.
Otherwise, -1 is returned and
errno
is set to indicate the error.
ERRORS
pset_ctl()
fails if one or more of the following is true:
- EINVAL
The
request
is invalid.
- EINVAL
The specified processor set
pset,
or the processor or the locality domain specified by
id
is invalid.
- EINVAL
The request is
PSET_GETNEXTPSET
and there is no other processor set after
pset,
or the request is
PSET_GETNEXTSPU
and there is no other processor after
id
in
pset,
or the request is
PSET_GETNEXTLDOM
and there is no other locality domain after
id
in
pset.
- ENOSYS
The processor set functionality is not supported by the
underlying HP-UX version.
AUTHOR
pset_ctl()
was developed by HP.
