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Message-ID: <3ae72650705211050p6b6cefbdya70dd4e0a27e2d1b@mail.gmail.com> Date: Mon, 21 May 2007 19:50:46 +0200 From: "Kay Sievers" <kay.sievers@...y.org> To: "Pierre Ossman" <drzeus-list@...eus.cx> Cc: "Greg KH" <greg@...ah.com>, LKML <linux-kernel@...r.kernel.org> Subject: Re: Race free attributes in sysfs On 5/20/07, Pierre Ossman <drzeus-list@...eus.cx> wrote: > I'm reworking the sysfs stuff in the MMC layer to be a bit more flexible, but > there is one thing that has me baffled; how do you add attributes to an object > in a race free manner when you have a dynamic set of attributes. > > I've looked at other parts of the kernel and they all use: > > 1. Add object. > 2. Add attributes. > > To me, it seems like there's a window between 1 and 2 where the object is in > /sys but doesn't have the proper attributes. Life for user space gets very > annoying if it has to add artificial delays to avoid this window. > > So how do I do this properly? Something like this would, from my point of view, > be the sane method: > > 1. Add hidden object. > 2. Add attributes. > 3. Show object. Do you have a fixed set of attribute names, where you just want to create a subset from that matches the individual device, or do you need some sort of free naming for the attributes? Kay - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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