osf1 man page for cpu_get_num

cpu_get_info(3) 					     Library Functions Manual						   cpu_get_info(3)

NAME
       cpu_get_info, cpu_get_num, cpu_get_max - Query CPU information for the platform (libc library)

SYNOPSIS
       #include <cpuset.h>

       int cpu_get_info(
	       ncpu_info_t *info ); int cpu_get_num(
	       void ); int cpu_get_max(
	       void );

PARAMETERS
       Points to an ncpu_info_t buffer to receive the CPU information for the booted configuration.

DESCRIPTION
       The  cpu_get_info()  function  returns  the following information about the platform CPU configuration in the buffer pointed to by the info
       parameter: Revision number.  Maximum number of CPUs supported by the machine architecture.  CPU processor set that  is  physically  plugged
       into  the system and recognized by the system console.  Set of online CPUs in the caller's partition; that is, the set of CPUs on which the
       caller can schedule work.  Set of CPUs in the partition that have processes bound to them.  Set of CPUs in the  partition  whose  processor
       set is marked for exclusive use.

       The  CPU  sets specified in the ncpu_info_t structure must have been created by the caller prior to the call.  If the caller specifies zero
       for a CPU set, the function silently ignores filling in data for that set.

       The information returned by the cpu_get_info() function is relative to the caller's partition.

       The cpu_get_num() function returns the actual number of CPUs available in the caller's partition.

       The cpu_get_max() function returns the maximum number of CPUs, including unpopulated CPU slots, that can be configured in the system.

NOTES
       A cpu_get_info() call is similar to a getsysinfo(GSI_CPU_INFO, ...)  call.  The principal difference is that the  main  ncpu_info_t  struc-
       ture fields returned by cpu_get_info() are of type cpuset_t, whereas the same information returned by getsysinfo()is of type ulong_t.  Fur-
       thermore, a getsysinfo(GSI_CPU_INFO, ...)  call returns information only about the first n CPUs, where n is the number of bits in a ulong_t
       field, or (sizeof(ulong_t)*8).

       For cpu_get_info(), the ncpu_version field of the info argument must be set to NCPU_INFO_VERSION prior to the call.

RESTRICTIONS
       The  information  returned by these functions is a snapshot of the platform/partition configuration at the time the information is sampled.
       The data may be stale by the time the caller uses the information.

RETURN VALUES
       The cpu_get_info() function returns the following values: Success.  Failure. In this case, errno is set to indicate the error.

       The cpu_get_num() and cpu_get_max() functions return values as stated in the DESCRIPTION. These functions always complete successfully.

ERRORS
       The cpu_get_info() function fails,  it sets errno to one of the following values: The info argument or one of the cpuset_t elements, points
       to  an  invalid address.  One or more of the cpuset_t elements of the info argument points to an invalid CPU set, possibly one that was not
       created by cpusetcreate().  The version number specified in the ncpu_version field of the info argument is not recognized by the system.

SEE ALSO
       Functions: cpusetops(3), numa_intro(3)

																   cpu_get_info(3)