Determine processor ids for virtual processors on the same phys. processor

Hi!
Is there an API to determine the processor ids of all virtual processors that belong to a physical processor (for example the cpu ids for all cores that are on one socket in a multi-core architecture)?
I'm looking for a solution especially for UltraSPARC and SPARC64 CPUs.
There is the command "psrinfo" which, when called with the arguments "-p -v" procuces an output like:
The UltraSPARC-IV+ physical processor has 2 virtual processors (0, 16)
The UltraSPARC-IV+ physical processor has 2 virtual processors (1, 17)
The UltraSPARC-IV+ physical processor has 2 virtual processors (2, 18)
The UltraSPARC-IV+ physical processor has 2 virtual processors (3, 19)
On this systems, processor ids 0 and 16 belong to the same socket, as well as 1 and 17 and so on. On larger systems (e.g. a SunFire6900), processor ids 0 and 512 are the ids of the two cores on the same socket, 1 and 513 and so on.
Is there any API that allows to determine this information, which virtual processor ids are ids for processors on the same physical processors?
Thanks,
Nick.

On recent versions of the OS, that information is exposed through 'kstat'. Look at the 'cpu_info' stuff. Each VP should have a 'core_id' as well. If two CPUs have the same core_id, then they're multi-threading cores exposed as multiple processors.
Then I think (but not as sure) that 'chip_id' is similar, but refers to packaging assembly and is similar to the information you're seeing on psrinfo.
Darren

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Determine processor ids for virtual processors on the same phys. processor

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