Re: Support for embedded cpu's

[Jan Hudec <bulb@ucw.cz>]

On Fri, May 02, 2003 at 02:38:44PM +0100, James Stevenson wrote:
> Hi
> 
> i have a PCI card with several embedded cpu's on it which can generate irq's
> to the host across the pci interface. I would like these to be used from a
> programming executing on the host.
> 
> What is the best way todo this ?
> 
> The only thing i have though about is so use signals but what would
> be a good signal to use to so support functionality like that ?

Signals are slow, pushing info to process using signals is not extremely
nice and neither is writing signal handling in user-land.

I would suggest you make a device and implement poll and/or sending
notification signal (set by F_SETSIG fcntl). Thus you could either have
a thread waiting in poll for an interrupt or handling it in signal
handler it chooses.

-------------------------------------------------------------------------------
						 Jan 'Bulb' Hudec <bulb@ucw.cz>
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