Hi Mikael, Which version of the OSG are you using?
Robert. On 7 February 2012 09:37, mikael lemercier <[email protected]> wrote: > Hi all, > > I'm currently testing my osg application and I sometimes (1/10000) get the > following warning: > "Warning: deleting still referenced object XXX of type 'XXX' > the final reference count was 1, memory corruption possible." > Followed by a crash. > > Looking at osg::Referenced::unref(), I wonder if this function is really > thread safe. > Indeed, nothing seems to prevent the _refCount variable to be modified > between the operator-- and the deletion of the object. > If a thread increments _refCount after the operator--, the delete is still > called and we get the warning. > > > I made a quick test to reproduce it: > > #include <OpenThreads/Thread> > #include <osg/Image> > > class MyThread : > public OpenThreads::Thread { > public: > MyThread(osg::Image* imagePtr) : > _imagePtr(imagePtr) { > } > > virtual ~MyThread() { > } > > void run() { > microSleep(50); > _imageRefPtr = _imagePtr; > } > > osg::Image* _imagePtr; > osg::ref_ptr<osg::Image> _imageRefPtr; > }; > > > > int main(int argc, char** argv) { > > osg::Image* imagePtr = new osg::Image(); > MyThread t(imagePtr); > > osg::ref_ptr<osg::Image> imageRefPtr(imagePtr); > t.startThread(); > imageRefPtr = 0; > t.join(); > > return 0; > } > > > I also needed to add a microsleep in osg::Referenced::unref() so that i > could reproduce the warning more easlily. > > if (needDelete) > { > OpenThreads::Thread::microSleep(1000); > signalObserversAndDelete(true,true); > } > return newRef; > > > Thanks > Mikaël > > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
