Re: NetBSD vs Solaris condvar semantics

[Taylor R Campbell <campbell+netbsd-tech-kern%mumble.net@localhost>]

   Date: Sun, 14 Oct 2012 09:37:09 +0200
   From: Martin Husemann <martin%duskware.de@localhost>

   In the zfs code, where do they store the mutex needed for cv_wait?

In the two cases I have come across, dirent locks and range locks, a
number of condvars, one per dirent or one per range, share a common
mutex in some common enclosing object, such as a znode.  So, e.g., the
end of zfs_dirent_unlock looks like

cv_broadcast(&dl->dl_cv);       /* dl is a dirent lock stored in dzp.  */
mutex_unlock(&dzp->z_lock);
cv_destroy(&dl->dl_cv);
kmem_free(dl, sizeof(*dl));