Getting exception traces across threads

torhu Joined: 03/31/06 Posts: 69

Posted: 03/05/08 01:35:41 I'm using the team0xf backtrace hack with 0.99.5. Is there a way to get a stack trace for an exception that's not coming from the main thread? I'm having a hard time debugging some exceptions. ddbg doesn't catch them either. Is the trace info stored anywhere, like in the 'info' field? If it is, I guess I could catch the exception, store it in a global variable, and then access the info from the main thread.

Author	Message
yfktn Joined: 02/08/08 Posts: 4	Posted: 03/05/08 01:55:07 I usually use try and catch in suspicious part of my code in any thread, and use tango.util.log.Log with Hierarchy relative to main thread, and used trace(...) method heavily then save it into file with Appender. It really useful method for me.
torhu Joined: 03/31/06 Posts: 69	Posted: 03/05/08 23:23:31 What I'm looking for is a way to avoid just what you're suggesting, littering my code with try/catch, printf, etc. that's only there for debugging purposes. I've got enough of that in there already. Being able to get a backtrace for other threads than the main one would be a superb way to debug multithreaded code.
kris Joined: 03/27/04 Posts: 581	Posted: 03/06/08 04:28:31 You can get a backtrace for other threads, but you have to catch the Exception yourself (and display the msg). One reasonable approach might be to subclass Thread, intercept the run() method, wrap super.run() it in a try/catch, and deal with Exceptions as they happen
sean Joined: 06/24/04 Posts: 109	Posted: 03/07/08 22:24:40 If you join the failed thread then it should rethrow the exception that caused it to terminate. Catch this and it will contain the backtrace.
torhu Joined: 03/31/06 Posts: 69	Posted: 03/14/08 22:46:36 Here's what I get: http://paste.dprogramming.com/dpz145xc Do I need a custom trace handler or something for this to work? There's no backtrace in the exception object.
torhu Joined: 03/31/06 Posts: 69	Posted: 03/15/08 17:51:20 keinfarbton tells me that this doesn't work with the backtrace hack. But it works when using the jive library, which is linux only. Here's the output from the same test code using jive on linux: http://paste.dprogramming.com/dpeswzpk
sean Joined: 06/24/04 Posts: 109	Posted: 03/18/08 17:27:53 I haven't seen the Jive lib -- where is it hosted? I think it could be made to work with flectioned if it doesn't already, but no idea about the backtrace hack. That one requires changes to the code that handles the throwing of exceptions, and I'm not sure offhand if it could be made to work or not.
larsivi Joined: 03/27/04 Posts: 614	Posted: 03/18/08 21:27:31 sean wrote: I haven't seen the Jive lib -- where is it hosted? TangoUsers - Look for Jive :P
sean Joined: 06/24/04 Posts: 109	Posted: 03/18/08 22:21:10 Oops! I'd just checked the DSource projects list. In any case, Jive is a nice little package. I don't suppose there's a chance of a Win32 version?
torhu Joined: 03/31/06 Posts: 69	Posted: 03/19/08 00:04:58 I haven't tried Flectioned. Can it be used for getting exception traces for other threads the main one? In that case, any chance that it works with dmd 1.027 and Tango 0.99.5 on Windows?
keinfarbton Joined: 12/03/05 Posts: 49	Posted: 03/19/08 18:31:46 The jive lib is currently not up to date with the Exception changes in -r3145. I have an updated and working version. Contact me to get a copy.
kris Joined: 03/27/04 Posts: 581	Posted: 03/19/08 18:44:41 Is that for Posix only, keinfarbton?
keinfarbton Joined: 12/03/05 Posts: 49	Posted: 03/19/08 20:53:27 Yes. It uses libbfd for address to symbol resolution.