Re: Using Hardware Interrupts to invoke a user space action

Hi Fahd,

Zitat von Fahd Abidi <[email protected]>:

> Is this possible? Can any one tell me how this could be done? What
> functions can I use to pass a signal from kernel space to user space to
> invoke an action in my application. Sounds like there may be thread
> access issues here as the handler could invoke a write to my buffer in
> memory just as I am issuing a read command to read the contents of that
> buffer. Any suggestions will be greatly appreciated, as I mentioned I am
> new to this arena.

well this is more or less a general question about linux device driver  
development. Have you had a look at [3]?

What you are looking for, might be the functionality of Waitqueues.  
(see also [3]) Your reading application will block in the driver on  
the Waitqueue (wait_event_*). The interrupt handler then again will  
wake up this Waitqueue and in turn the read() call from the  
application will return. This scheme is describe in detail in [3].

Hope this helps,

Markus


[3] Linux Device Drivers, Corbet, Rubini, Kroah-Hartman, 3rd  
Editition, O'Reily





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