libsoc will do this out of the box for you.

https://github.com/jackmitch/libsoc

Cheers,

On 14/02/14 00:41, Carl-Fredrik Sundström wrote:
> Ok I am answering my own question, I found the following page that
> describes how to do this. I haven't tested yet though
> 
> https://developer.ridgerun.com/wiki/index.php/How_to_use_GPIO_signals
> 
> 
> On Thursday, February 13, 2014 1:56:18 PM UTC-6, Carl-Fredrik Sundström
> wrote:
> 
> 
> 
>     I have been trying to find a good example of GPIO Input where a
>     thread blocks until input changes.
>     Are these any such examples ? Is it even possible ? I have looked at
>     Derek Molloy's code it is
>     polling file in a tight loop.
> 
>     Certainly there has to be another way of doing the GPIO input more
>     efficiently?
> 

-- 
  Jack Mitchell ([email protected])
  Embedded Systems Engineer
  Cambridgeshire, UK
  http://www.embed.me.uk
-- 

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