Hello Matthias,
What do you mean by threadsafe in this context?
By locking the mutex you achive nothing but subtle changes in timings,
if you don't lock it somewhere else.
Are you maybe refering to multiple threaded intersectors?
Indeed the intersection should be safe if done after the viewers event
traversal. At least this is working fine for me.
Cheers
Sebastian
Hi folks,
should the IntersectionVisitor and LineSegmentIntersector be threadsafe?
With the multithreaded pseudocode below everything works fine with the
ScopedLock. If I disable the ScopedLock I get wrong results.
Thank you!
Cheers,
Matthias
Code:
osg::Vec3d dummy;
osg::ref_ptr<osgUtil::LineSegmentIntersector> lineSegmentIntersector = new
osgUtil::LineSegmentIntersector(dummy, dummy);
osg::ref_ptr<osgUtil::IntersectionVisitor> visitor = new
osgUtil::IntersectionVisitor(lineSegmentIntersector);
...
osg::Vec3d P1, P2;
lineSegmentIntersector->setStart(P1);
lineSegmentIntersector->setEnd(P2);
...
osg::Node* searchroot;
OpenThreads::Mutex mutex;
...
{
OpenThreads::ScopedLock<OpenThreads::Mutex> lock(mutex); // Works when enabled.
Doesn't work when disabled!
lineSegmentIntersector->reset();
searchroot->accept(*visitor);
}
if (lineSegmentIntersector->containsIntersections())
{
...
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=64590#64590
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