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Date: Thu, 7 Aug 2008 23:27:00 +0200
From: Ed Schouten <ed@80386.nl>
To: John Baldwin <jhb@FreeBSD.org>
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Cc: cvs-src@FreeBSD.org, src-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: Re: cvs commit: src/share/man/man9 condvar.9 sleep.9 src/sys/kern
	kern_condvar.c kern_synch.c
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* John Baldwin <jhb@FreeBSD.org> wrote:
> Permit Giant to be passed as the explicit interlock either to
> msleep/mtx_sleep or the various cv_*wait*() routines.  Currently, the
> "unlock" behavior of PDROP and cv_wait_unlock() with Giant is not
> permitted as it is will be confusing since Giant is fully unrecursed and
> unlocked during a thread sleep.
>=20
> This is handy for subsystems which wish to allow unlocked drivers to
> continue to use Giant such as CAM, the new TTY layer, and the new USB
> stack.  CAM currently uses a hack that I told Scott to use because I
> really didn't want to permit this behavior, and the TTY and USB patches
> both have various patches to permit this.

Thanks a lot, John! As you mentioned, this was one of the things I
needed in the MPSAFE TTY layer. I'll remove my evil hacks from the
code in a sec.

Yours,
--=20
 Ed Schouten <ed@80386.nl>
 WWW: http://80386.nl/

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