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Particles: fix a deadlock condition

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This commit is contained in:
James Turner 2020-08-17 15:04:16 +01:00
parent 84c15f6384
commit 3b41b0c6d3
1 changed files with 18 additions and 11 deletions
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29
simgear/scene/model/particles.cxx
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@ -78,6 +78,21 @@ public:
// _localWind = om.preMult(w);
}
// only call this with the lock held!
osg::Group* internalGetCommonRoot()
{
if (!_commonRoot.valid()) {
SG_LOG(SG_PARTICLES, SG_DEBUG, "Particle common root called.");
_commonRoot = new osg::Group;
_commonRoot->setName("common particle system root");
_commonGeode->setName("common particle system geode");
_commonRoot->addChild(_commonGeode);
_commonRoot->addChild(_updater);
_commonRoot->setNodeMask(~simgear::MODELLIGHT_BIT);
}
return _commonRoot.get();
}
std::mutex _lock;
bool _frozen = false;
osg::ref_ptr<osgParticle::ParticleSystemUpdater> _updater;
@ -342,16 +357,7 @@ void ParticlesGlobalManager::setWindFrom(const double from_deg, const double spe
osg::Group* ParticlesGlobalManager::getCommonRoot()
{
std::lock_guard<std::mutex> g(d->_lock);
if (!d->_commonRoot.valid()) {
SG_LOG(SG_PARTICLES, SG_DEBUG, "Particle common root called.");
d->_commonRoot = new osg::Group;
d->_commonRoot->setName("common particle system root");
d->_commonGeode->setName("common particle system geode");
d->_commonRoot->addChild(d->_commonGeode);
d->_commonRoot->addChild(d->_updater);
d->_commonRoot->setNodeMask(~simgear::MODELLIGHT_BIT);
}
return d->_commonRoot.get();
return d->internalGetCommonRoot();
}
osg::ref_ptr<osg::Group> ParticlesGlobalManager::appendParticles(const SGPropertyNode* configNode, SGPropertyNode* modelRoot, const osgDB::Options* options)
@ -722,12 +728,13 @@ osg::ref_ptr<osg::Group> ParticlesGlobalManager::appendParticles(const SGPropert
}
// touch shared data now (and not before)
{
std::lock_guard<std::mutex> g(d->_lock);
d->_updater->addParticleSystem(particleSys);
if (attach != "local") {
getCommonRoot()->addChild(callback()->particleFrame);
d->internalGetCommonRoot()->addChild(callback()->particleFrame);
}
if (!d->_globalCallbackRegistered) {