Re: [patch] udevd - cleanup and better timeout handling

[Kay Sievers <kay.sievers@vrfy.org>]

On Mon, Jan 26, 2004 at 11:28:19AM -0800, Greg KH wrote:
> On Mon, Jan 26, 2004 at 08:11:10PM +0100, Kay Sievers wrote:
> > On Mon, Jan 26, 2004 at 10:22:34AM -0800, Greg KH wrote:
> > > On Sun, Jan 25, 2004 at 09:03:14PM +0100, Kay Sievers wrote:
> > 
> > So if we can get threads in klibc, I would prefer to switch to sockets.
> > IPC isn't really a  option for a todays program, but it works for us and
> > sockets don't solve any big problem we have.
> 
> Where would we need threads to do this?  In udevsend?  Can't we just
> send the message to the socket and forget about it there?

udevd need to be able to talk to multiple senders at the same time.
Otherwise a simple connect from a client blocks the whole process.
You may use select() for this and multiplex the connections, or fork
a child and maintain the queue in shared memory. But that's all not
really nice. I think threads are the nicest option, if you want sockets.


> In udevd can't we just read the socket if any data is available?

No, it blocks, until the client sends, or we need to poll.


> No, I do not think klibc will ever support them, and state machines are
> much nicer than multi threaded apps (for the most part.)

What kind of state machine you are thinking of?
How does it handle multiple client sockets. Do you mean a scheduler?


> If sockets don't really help much, I'll go add support to klibc for ipc...

I'm fine with it.
We cant do it later if we want, when all the other problems are solved :)

thanks,
Kay


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