cpu_get_info man page on DigitalUNIX

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cpu_get_info(3)						       cpu_get_info(3)

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

       #include <cpuset.h>

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

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

       The cpu_get_info() function returns the following information about the
       platform CPU configuration in the buffer pointed to by the info parame‐
       ter:  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 cre‐
       ated 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, includ‐
       ing unpopulated CPU slots, that can be configured in the system.

       A cpu_get_info() call is similar	 to  a	getsysinfo(GSI_CPU_INFO,  ...)
       call.  The principal difference is that the  main ncpu_info_t structure
       fields returned by cpu_get_info() are of	 type  cpuset_t,  whereas  the
       same  information returned by getsysinfo()is of type ulong_t.  Further‐
       more, 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.

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

       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.

       The cpu_get_info() function fails,  it sets errno to one of the follow‐
       ing 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  sys‐

       Functions: cpusetops(3), numa_intro(3)


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