assign_cpu_to_pset(3)assign_cpu_to_pset(3)NAMEassign_cpu_to_pset - Assigns a processor to a processor set
#include <sys/types.h> #include <sys/processor.h>
unsigned long cpu,
long option );
Pset Library (libpset)
Mach Library (libmach)
Processor or processors to assign to the specified processor set. Pro‐
cessor set identifier, which is returned by the create_pset() function.
Specifies a bit mask. Currently, only the ANY_CPU bit is supported. If
this bit is set, the value specified by the cpu variable is the number
of processors to be assigned to the specified processor set from the
default processor set. If the ANY_CPU bit is not set, the value speci‐
fied by the cpu variable is the mask of processors to be assigned to
the processor set.
The assign_cpu_to_pset() function removes processors from their current
processor set and assigns them to the processor set specified by the
pset_id variable. This function requires root privileges.
If the ANY_CPU option is specified, the number of processors specified
by the cpu variable are assigned from the default processor set to the
processor set that is specified with the pset_id variable. If the spec‐
ified number of processors are not available in the default processor
set, an error is returned and no processors are assigned.
If the ANY_CPU option is not set, the value specified by the cpu vari‐
able is a mask of processors to be assigned to the specified processor
set. For example, if you specify a cpu value of 6, then processors 2
and 3 are assigned to the processor set.
Note that processors are not required to start in slot 0 on some plat‐
forms. For example, you may see a three-processor system with proces‐
sors in slots 6, 7, and 8. The console assigns the master processor at
power up, which is usually the processor in slot 0 if it is occupied.
However, there is no requirement that slot 0 must be populated or that
the master is the first processor on the bus. In the example of the
three-processor (slots 6, 7, and 8) system, the master processor will
be the one in slot 6.
Processor assignments are logged in the /var/adm/wtmp file.
If the processor assignment is successful, the assign_cpu_to_pset()
function returns zero (0). If the assignment is unsuccessful, the
function returns a negative number. Use the print_pset_error() func‐
tion to print a message that describes the error.
SEE ALSObind_to_cpu(3), create_pset(3), destroy_pset(3), assign_pid_to_pset(3),
print_pset_error(3), processor_sets(4), pset_create(1)assign_cpu_to_pset(3)