How can i wakeup program thread with button PIO

[Altera_Forum]

I found Microtronix's driver for button PIO (on Altera dev. board) altera_pio_button.c 

 It seem to catch the IRQ from button and update value in device file.  Is it possible to use this IRQ to wakeup a thread in user program?  I think that IRQ is accessible only through the kernel, but maybe the driver can send a signal or the thread (in the user program) can wait in wait_queue of the driver?  If it possible, please write some code because i still not friendly with Linux functions.

[Altera_Forum]

You can use select(). 

Look at "man select". There is a example with timeout.  Or, if you don't need timeout, just a blocked read() will do.

[Altera_Forum]

--- Quote Start ---  originally posted by hippo@Jan 12 2007, 04:02 AM or, if you don't need timeout, just a blocked read() will do.  --- Quote End ---    Can anyone give me an example for using blocked read with this driver (altera_pio_button.c) ?

[Altera_Forum]

--- Quote Start ---  originally posted by motal+jan 14 2007, 11:19 pm--><div class='quotetop'>quote (motal @ jan 14 2007, 11:19 pm)</div>  --- quote start ---  <!--quotebegin-hippo@Jan 12 2007, 04:02 AM  or, if you don&#39;t need timeout, just a blocked read() will do.  --- Quote End ---    Can anyone give me an example for using blocked read with this driver (altera_pio_button.c) ? <div align='right'><{post_snapback}> (index.php?act=findpost&pid=20572)</div> [/b]  --- Quote End ---   example apps to use button pio. http://forum.niosforum.com/forum/index.php...topic=2285&hl=# (http://forum.niosforum.com/forum/index.php?showtopic=2285&hl=#)