Re: async io?

Alan Cox (alan@lxorguk.ukuu.org.uk)
Thu, 6 May 1999 13:21:15 +0100 (BST)


> The 2.2 kernel can generate aio-like realtime signals upon I/O
> completion (see http://www.kegel.com/c10k.html);
> you associate a signal to an fd using the F_SETSIG ioctl.

glibc 2.1 supports the posix aio_ stuff too

> However, you don't have the ability to specify one signal
> for one I/O operation, and a different signal for the next,
> I think. And that means you can't tell what the signal
> means, i.e. whether the socket is now ready for reading,
> or for writing. I hope I'm wrong about this.

You don't need to. Real time signals carry data - in this case the file
handle

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