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Chipmunk Physics • View topic - active2staticIter crashing application

active2staticIter crashing application

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active2staticIter crashing application

Postby bdittmer » Tue Sep 01, 2009 9:02 am

Hello, I was wondering if anyone is experiencing issues with chipmunk2d apps crashing in the active2staticIter function inside of cpSpace.c. It appears that a dangling pointer being passed into the function and causing the crash. Below is a stack trace of the relevant chipmunk functions:

0 0x0000caf4 active2staticIter (cpSpace.c:437)
1 0x0000d748 eachHelper (cpSpaceHash.c:324)
2 0x0000b3e6 cpHashSetEach (cpHashSet.c:192)
3 0x0000d786 cpSpaceHashEach (cpSpaceHash.c:334)
4 0x0000cc52 cpSpaceStep (cpSpace.c:479)

My application is actively removing shapes/bodies from the space from inside collisions (the shapes/bodies are being removed, not free'd - they are added back in later) . What I assume is happening is cpSpaceStep is being called, a collision happens and a shape is removed from the space, and so the pointer to that shape passed into active2staticIter is no longer valid. Does this sound about right? If so does anyone have any solutions or work arounds? I can post code if necessary. Thanks!
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Re: active2staticIter crashing application

Postby slembcke » Tue Sep 01, 2009 9:11 am

What version? There were 5 or so dangling pointer bugs that would cause that to crash in 4.x if you were removing shapes inside a callback. Still not really sure if it was worth the effort either as doing so in a GCed language could still end up freeing the shape/body and cause a crash.
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Re: active2staticIter crashing application

Postby bdittmer » Tue Sep 01, 2009 9:22 am

It looks like version 4 - it shipped with cocos2d .8.0. I am unable to find any version number in the chipmunk source or listed in the cocos documentation, but based on the ReadMe in the chipmunk directory, 4.0 is a good a guess. Should I try upgrading to the latest version? Since this is obviously an iPhone app a GC shouldn't be any trouble :)
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Re: active2staticIter crashing application

Postby slembcke » Tue Sep 01, 2009 9:49 am

Well. That actually is the latest released version. I've made a ton of changes in trunk, but have been sitting on them for a long time as I haven't had the time to make a proper release for it.
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Re: active2staticIter crashing application

Postby bdittmer » Tue Sep 01, 2009 9:57 am

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Re: active2staticIter crashing application

Postby slembcke » Tue Sep 01, 2009 11:17 am

I think I was not very clear. 4.1.0 is the latest point release. I have a ton of changes in trunk in the SVN repository that have not had an official release. That is where I made the fixes for removing objects inside a callback.
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Re: active2staticIter crashing application

Postby bdittmer » Tue Sep 01, 2009 11:44 am

Indeed I did misunderstand. :) Is trunk considered stable and ready for production use?
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Re: active2staticIter crashing application

Postby slembcke » Tue Sep 01, 2009 12:32 pm

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Re: active2staticIter crashing application

Postby teedr » Sun Nov 08, 2009 6:33 pm

I am experiencing these same problems. Sorry, could you explain how I can work around it?

Thanks a lot.
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Re: active2staticIter crashing application

Postby zaerl » Mon Nov 09, 2009 8:06 am

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