Date: Fri, 13 Jul 2007 10:55:12 +0200 From: Hans Petter Selasky <hselasky@c2i.net> To: freebsd-current@freebsd.org, attilio@freebsd.org Cc: Julian Elischer <julian@elischer.org>, FreeBSD Current <current@freebsd.org> Subject: Re: crash in tty code in 6.1.. fixed since? Message-ID: <200707131055.12084.hselasky@c2i.net> In-Reply-To: <46973708.2040401@FreeBSD.org> References: <46970DF7.3000803@elischer.org> <200707131021.59966.hselasky@c2i.net> <46973708.2040401@FreeBSD.org>
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On Friday 13 July 2007 10:25, Attilio Rao wrote: > Hans Petter Selasky wrote: > > If TTY was not Giant locked, you would have had an error there if another > > mutex was locked, and the problem would have been solved years ago :-) > > Not sure what you mean, but the first evidence is that you would have > explicitly drop/pickup the mutex so that you would have handled the race > not trasparently as Giant does. > Moreover, it seems that tty should be partially locked with a sleeping > primitive (sx probabilly). > If you lock a mutex first and then a sx-lock, you should get a warning, right? --HPS
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