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Re: [Discuss-gnuradio] KeyboardInterrupt not being caught in top_block


From: Kyle Zhou
Subject: Re: [Discuss-gnuradio] KeyboardInterrupt not being caught in top_block
Date: Thu, 17 Jun 2010 14:53:28 +1000

Thanks Eric,
I am using GNU Radio git depository installed a month ago.
tried on Cygwin 1.7.5+WinXP and OSX 10.6.3+Macbook, both behaved the same.
I'll try ubuntu tomorrow when I have access to another PC.
Ctrl+C exits the program but not caught by except.

On 17/06/2010, at 5:45 AM, Eric Blossom wrote:

> What version of GNU Radio?
> What OS, distribution, version?
> (We fixed bugs in this area about a year ago...)
> 
> 
> On Thu, Jun 17, 2010 at 12:29:10AM +1000, Kyle Zhou wrote:
>> 
>> Basically, I want to catch Ctrl+C after top_block.run()
>> For example
>> 
>>    try:
>> 
>>        my_top_block().run()
>> 
>>    except KeyboardInterrupt:
>> 
>>        print "Ctrl+C has been pressed. Exiting."
>> 
>> 
>> However, when Ctrl+C is pressed, the program exits straight away without
>> executing the print function.
>> 
>> It seems that KeyboardInterrupt is not propagated to the main thread?
>> 
>> 
>> What am I doing wrong?
>> 
>> 
>> By the way, if I caught some exception in work(), what is the best way to
>> exit the program? top_block.stop() or raise SystemExit, 1?
> 
> Just return -1 from work.  The graph will stop.
> 
> Eric




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