Re: How to prevent a mutex being _enter()ed from being _destroy()ed?

[Robert Elz <kre%munnari.OZ.AU@localhost>]

    Date:        Fri, 10 Aug 2018 08:03:55 -0400
    From:        Greg Troxel <gdt%lexort.com@localhost>
    Message-ID:  <smuzhxuv36c.fsf%linuxpal.mit.edu@localhost>

  | Ancient BSD tradition is not to explain these things :-(

Older than that.   Don't you remember
	you are not expected to understand this
(or wording very similar) in ancient 4th/5th edition unix.

kre