Re: [newbie] timer in module

[sebastien person <sebastien.person@sycomore.fr>]

Le Fri, 18 May 2001 13:43:21 +0100 (BST)
Alan Cox <alan@lxorguk.ukuu.org.uk> a ecrit :

> > I've no experience of a regularly call that let the hand to the
module.
> > My aim is to do a get data call every x seconds (x is variable).
> 
> 	init_timer()
> 	add_timer()
> 	del_timer()
> 
> are your frinnds.
> 
> > In the case of a network module wich is able to send and receive data,
> > whats happen if the driver is sollicited when he received or send data
?
> > the tbusy bit is it designed to avoid this case ?
> 
> Your timer is like an interrupt (in fact it runs from one) so you will
need
> to lock it against transmit, receive, multicast list loads and get_stats
> all of which can happen at the same time.

So I must disable interrupt when I handle another function like receive
etc ...

> 
> tbusy on 2.2 (its replaced on 2.4 with nicer stuff) is for write path
locking,
> and the kernel ensures your send packet routine wont be re-entered by
another
> send packet. It ensures you wont get an IRQ while handling the IRQ
> 
> The rest is up to you

Thanks