Date: Tue, 12 Aug 2008 17:28:53 +0000 From: "Poul-Henning Kamp" <phk@phk.freebsd.dk> To: Bruce Evans <brde@optusnet.com.au> Cc: cvs-src@FreeBSD.org, src-committers@FreeBSD.org, Ed Schouten <ed@FreeBSD.org>, cvs-all@FreeBSD.org, John Baldwin <jhb@FreeBSD.org> Subject: Re: cvs commit: src/sys/dev/io iodev.c Message-ID: <35880.1218562133@critter.freebsd.dk> In-Reply-To: Your message of "Wed, 13 Aug 2008 03:23:47 %2B1000." <20080813014505.H1310@besplex.bde.org>
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In message <20080813014505.H1310@besplex.bde.org>, Bruce Evans writes: >I once thought that using D_TRACKCLOSE was the right fix for this in >serial drivers. D_TRACKCLOSE Was created for drivers that need per open state reclaimation, forced closes is an entirely different kettle of fish. Writing a driver to support forced closes is significantly more work than writing a "normal" driver, but it can be eased a lot if we add infrastructure to keep track of and wake up all sleeping threads in a particular driver. Either way, it is significant architectural work. Poul-Henning -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.
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