per-user basis not a per-process. We cannot really keep track on
a per-process basis because a parent process can create the semaphore
and a child can free it taking credit for it. There is also a
similar issue about resource exhaustion if we limited the number
of lwps per process as opposed to per user (which we don't).
is a global sysctl kern.maxlwp to control this, which is by default 2048.
The first lwp of each process or kernel threads are not counted against the
limit. To show the current resource usage per user, I added a new sysctl
that dumps the uidinfo structure fields.
riastradh