Date: Mon, 20 Jul 2009 14:36:08 +0200 From: Ed Schouten <ed@80386.nl> To: Benjamin Kaduk <kaduk@MIT.EDU> Cc: freebsd-hackers@freebsd.org Subject: Re: add missing content to locking.9 ? Message-ID: <20090720123607.GI68469@hoeg.nl> In-Reply-To: <alpine.GSO.1.10.0907200106100.17043@multics.mit.edu> References: <alpine.GSO.1.10.0907200106100.17043@multics.mit.edu>
next in thread | previous in thread | raw e-mail | index | archive | help
[-- Attachment #1 --] Hi Benjamin, * Benjamin Kaduk <kaduk@MIT.EDU> wrote: > +.Tn POSIX > +semaphores provide ... it looks like you described the semaphores that are used in userspace. The Semaphores section of the locking(9) man page should describe in-kernel semaphores (kern_sema.c). They are implemented by a mutex and a conditional variable. Even though it's nice to have some utility functions in our kernel, I always wondered why we have them. There isn't a lot of code in the tree that uses them... -- Ed Schouten <ed@80386.nl> WWW: http://80386.nl/ [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (FreeBSD) iEYEARECAAYFAkpkZLcACgkQ52SDGA2eCwVOZgCfcBM0q829T6mTGw4U8FmpqvaA G68An3AEr3tnU9v2/TsVkwnk71VUWX44 =PSf8 -----END PGP SIGNATURE-----
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20090720123607.GI68469>