[gentoo-user] Simultaneously emerging multiple packages with same dependencies

[PK]

Hi,

Is there any way to simultaneously emerge multiple packages (multiple
instances of 'emerge') that share common dependencies ?

I'm aware that portage uses locking mechanism before modifying 'world' file,
but what about the actual building process ? I'd expect emerge to check if
dependency package is already build/installed (or currently being build by
another instance) and just skip it in this case, however I haven't tried it
yet.. Can anybody shred some light on this ?

Thanks,
P.