Threads information /proc

Hello All,

I am trying to port an application from Linux to NetBSD.

The application needs to know how many threads any given process has.
In Linux, it looks into /proc/<pid>/task for a count and thread id of
the various threads.

But /proc in NetBSD does not carry this information. Even the number
of threads reported in /proc/<pid>/stat is not proper.

Any suggestion on how to get the information provided in Linux via
/proc/<pid>/task in NetBSD?

Regards,
Me