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Message-ID: <2cd4ff050912020326rcd2d7ffseb481ca736cd7d8c@mail.gmail.com> Date: Wed, 2 Dec 2009 13:26:24 +0200 From: Mai Daftedar <mai.daftedar@...il.com> To: Davide Libenzi <davidel@...ilserver.org> Cc: Mark Hounschell <markh@...pro.net>, Clemens Ladisch <clemens@...isch.de>, linux-kernel@...r.kernel.org Subject: Re: Signal from kernel space to user space Thanks all for the help, I needed to use signals just as interrupt signal from the kernel space so that when a certain change occurs I'd be notified in the userspace I used send_sig _info and it worked :)..The problem was with the signal number I using a wong one.. Thanks > On Tue, Dec 1, 2009 at 8:05 PM, Davide Libenzi <davidel@...ilserver.org> wrote: >> >> On Tue, 1 Dec 2009, Mark Hounschell wrote: >> >> > If no "information" is required, which of these are the fastest, say from an interrupt handler? >> > I have a PCI card that handles external interrupts from the outside world and does nothing but >> > report those external interrupts to userland. We use send_sig or wake_up_process depending >> > on whether userland is going to wait for it or not. If there is a better/faster way I would be >> > very interested. >> >> eventfd is. eventfd_signal() is also callable from non-sleeping contexts. >> >> >> - Davide >> >> > -- 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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