RE: VDR recording glitches

[Mace Gael <MaceG@thmulti.com>]

For Linux kernel driver, we talk about Bottom Halves architecture (I
recommend the reading of the very usefull book "Linux Device Driver /
Alessandro Rubini / O'reilly).

"... Linux resolves this problem by splitting the interrupt handler into two
halves: the so-called 'top half' is the routine you register through
request_irq(), and the 'bottom half' ('bh' for short) is a routine that is
scheduled by the top half, to be executed later, at a safer time. ... The
big difference between the top-half handler and the bottom half is that all
interrupts are enabled during execution of the bh ..."

Why not adopt this driver architecture?

regards

Gaël

> ------>>    The speed can kill ==> use Windows   <<------
> 
> -----Original Message-----
> From:	Martin Kuhne [SMTP:Martin.Kuhne@gmx.de]
> Sent:	Wednesday, September 20, 2000 4:59 PM
> To:	fliegl@in.tum.de; Carsten Koch
> Cc:	Thomas Jagoditsch; linux-dvb@linuxtv.org; Ralph Metzler
> Subject:	RE: VDR recording glitches
> 
> Hmm.... Is there are need to do the complete work in the ISR? Maybe the
> ISR
> can be reduced to clear the interrupt signal and defer the actual work to
> a
> function outside the ISR?
> I don't have enough background in linux kernel drivers to be more
> specific.
> In Windows NT this is called a DPC (deferred procedure call). DPCs run
> with
> all interrupts enabled but at a higher priority than normal user-mode
> processes.
> 
> Regards
> Martin
> 
>