# Stop and display traceback when thread throws an exception

**URL:** <https://www.ruby-forum.com/t/stop-and-display-traceback-when-thread-throws-an-exception/195356>\
**Category:** Ruby\
**Created:** [September 22, 2010, 4:33am UTC](https://www.ruby-forum.com/t/stop-and-display-traceback-when-thread-throws-an-exception/195356 "2010-09-22T04:33:37Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![ralphshnelvar](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/e19adc/32.png) [@ralphshnelvar](https://www.ruby-forum.com/u/ralphshnelvar)\
**Post date:** [September 22, 2010, 4:33am UTC](https://www.ruby-forum.com/t/stop-and-display-traceback-when-thread-throws-an-exception/195356/1 "2010-09-22T04:33:37Z")

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Is there a way to stop all threads and display traceback when any thread  
(especially a thread that is not the main thread) throws an exception?

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**Author:** ![ralphshnelvar](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/e19adc/32.png) [@ralphshnelvar](https://www.ruby-forum.com/u/ralphshnelvar)\
**Post date:** [September 22, 2010, 9:49am UTC](https://www.ruby-forum.com/t/stop-and-display-traceback-when-thread-throws-an-exception/195356/2 "2010-09-22T09:49:42Z")

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Am 22.09.2010 04:24, schrieb Ralph S.:

> Is there a way to stop all threads and display traceback when any thread (especially a thread that is not the main thread) throws an exception?

You can either run ruby with the -d (or --debug) switch or call this  
somewhere in your code:

Thread.abort\_on\_exception = true

Vale,  
Quintus  
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**Author:** ![ralphshnelvar](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/e19adc/32.png) [@ralphshnelvar](https://www.ruby-forum.com/u/ralphshnelvar)\
**Post date:** [September 22, 2010, 10:03am UTC](https://www.ruby-forum.com/t/stop-and-display-traceback-when-thread-throws-an-exception/195356/3 "2010-09-22T10:03:45Z")

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in my experience the ruby-debug debugger (1.8.7) goes all haywire when  
you’re working with threads.

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**Author:** ![ralphshnelvar](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/e19adc/32.png) [@ralphshnelvar](https://www.ruby-forum.com/u/ralphshnelvar)\
**Post date:** [September 22, 2010, 2:43pm UTC](https://www.ruby-forum.com/t/stop-and-display-traceback-when-thread-throws-an-exception/195356/4 "2010-09-22T14:43:37Z")

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Quintus,

Wednesday, September 22, 2010, 1:48:58 AM, you wrote:

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Q\> Am 22.09.2010 04:24, schrieb Ralph S.:

> > Is there a way to stop all threads and display traceback when any thread (especially a thread that is not the main thread) throws an exception?

Q\> You can either run ruby with the -d (or --debug) switch or call this  
Q\> somewhere in your code:

Q\> Thread.abort\_on\_exception = true

Q\> Vale,  
Q\> Quintus

That was exactly what I was looking for. Thank you!