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wait_event_interruptible

My app has a thread separate from the main thread that calls my driver. 
 Within the driver the call blocks using

wait_event_interruptible(queue, condition == 0xda);

I know that elsewhere in the driver condition is being set to 0xda 
(because I have a printk there), but the wait is never broken until I do 
a ctrl-c on the app.  At that time the wait wakes up and takes the 
program path that checks to see if condition == 0xda.  So what I am 
seeing is that either the wait macro never sees the condition change 
until after the wait loop breaks, or the condition is not checked 
correctly in that loop.  

Any thoughts?
TIA

-- 
Best regards,
David Stroupe
Keyed-Up Software 


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