<div dir="ltr"><div><div><div>Hi Rick,<br><br></div>The Object that your observer is trying to dynamic_cast<> on is in the throws of being destructed - have a look at the stack trace, I'm not surprised this fails.<br><br></div>Try removing the use of the dynamic_cast<>, replacing it with a static_cast<>. As long as you don't dereference and just use it to double check other arrays the it things should be OK.<br><br></div><div>As a general note though, it's kind odd bit of code. What does you _renderStageMap contain? Just raw C pointers?<br><br></div><div>I suspect the code should probably be redesigned to avoid trying to do tricks like using an custom Observer to do house keeping.<br></div><div><br></div>Robert.<br><div><div><br></div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On 23 May 2016 at 17:45, Rick Irons <span dir="ltr"><<a href="mailto:Rick.Irons@mathworks.com" target="_blank">Rick.Irons@mathworks.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div link="#0563C1" vlink="#954F72" lang="EN-US">
<div>
<p class="MsoNormal">Hi all,<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">I am encountering an issue with a CullVisitor object not being properly deleted in version 3.4.0. I am encountering this issue when updating from version 3.0.1.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">The source of the problem is a failed Referenced to CullVisitor dynamic cast that occurs in the code below…<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"> virtual void objectDeleted(void* object)<u></u><u></u></p>
<p class="MsoNormal"> {<u></u><u></u></p>
<p class="MsoNormal"> osg::Referenced* ref = reinterpret_cast<osg::Referenced*>(object);<u></u><u></u></p>
<p class="MsoNormal"><span style="color:red"> osgUtil::CullVisitor* cv = dynamic_cast<osgUtil::CullVisitor*>(ref);<u></u><u></u></span></p>
<p class="MsoNormal"> OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_mutex);<u></u><u></u></p>
<p class="MsoNormal"> RenderStageMap::iterator itr = _renderStageMap.find(cv);<u></u><u></u></p>
<p class="MsoNormal"> if (itr!=_renderStageMap.end())<u></u><u></u></p>
<p class="MsoNormal"> {<u></u><u></u></p>
<p class="MsoNormal"> _renderStageMap.erase(cv);<u></u><u></u></p>
<p class="MsoNormal"> }<u></u><u></u></p>
<p class="MsoNormal"> }<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">The call stack at the time of the failed cast is the following…<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><img src="cid:image001.png@01D1B4EE.430210C0" height="128" width="570"><u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">The cv pointer is NULL following the cast. My suspicion is that the dynamic cast is failing because we are in the destructor of our own object that inherits the OSG CullVisitor object. I tested this suspicion by confirming that the same
dynamic cast will succeed in application code if done immediately before invoking the destructor of our version of the CullVisitor. This issue is blocking our update to 3.4.0 since it causes numerous unit test failures.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Any suggestions on how to address this issue? <u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">I created the hack below to temporary bypass the problem…<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"> virtual void objectDeleted(void* object)<u></u><u></u></p>
<p class="MsoNormal"> {<u></u><u></u></p>
<p class="MsoNormal"> osg::Referenced* ref = reinterpret_cast<osg::Referenced*>(object);<u></u><u></u></p>
<p class="MsoNormal"> osgUtil::CullVisitor* cv = dynamic_cast<osgUtil::CullVisitor*>(ref);<u></u><u></u></p>
<p class="MsoNormal"> OpenThreads::ScopedLock<OpenThreads::Mutex> lock(_mutex);<u></u><u></u></p>
<p class="MsoNormal"><span style="color:red"> if (cv != NULL)<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:red"> {<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:red"> RenderStageMap::iterator itr = _renderStageMap.find(cv);<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:red"> if (itr!=_renderStageMap.end())<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:red"> {<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:red"> _renderStageMap.erase(cv);<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:red"> }<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:red"> }<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:red"> else<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:red"> {<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:red"> for(RenderStageMap::iterator itr = _renderStageMap.begin();<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:red"> itr != _renderStageMap.end();<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:red"> ++itr)<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:red"> {<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:red"> osg::Referenced* tmpRef = dynamic_cast<osg::Referenced*>(itr->first);<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:red"> if (ref==tmpRef)<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:red"> {<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:red"> cv = itr->first;<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:red"> _renderStageMap.erase(cv);<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:red"> break;<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:red"> }<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:red"> }<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:red"> }<u></u><u></u></span></p>
<p class="MsoNormal"> }<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Thanks,<u></u><u></u></p>
<p class="MsoNormal">Rick<u></u><u></u></p>
</div>
</div>
<br>_______________________________________________<br>
osg-users mailing list<br>
<a href="mailto:osg-users@lists.openscenegraph.org">osg-users@lists.openscenegraph.org</a><br>
<a href="http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org" rel="noreferrer" target="_blank">http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org</a><br>
<br></blockquote></div><br></div>