osg::StateSet*
ResourceCache::getStateSet( SkinResource* skin )
{
// first check if it exists
{
Threading::ScopedReadLock shared( _skinCacheMutex );
SkinCache::Record rec = _skinCache.get( skin );
if ( rec.valid() )
return rec.value();
}
// no? exclusive lock and create it.
{
Threading::ScopedWriteLock exclusive( _skinCacheMutex );
// double check to avoid race condition
SkinCache::Record rec = _skinCache.get( skin );
if ( rec.valid() )
return rec.value();
// still not there, make it.
osg::StateSet* stateSet = skin->createStateSet();
if ( stateSet )
_skinCache.insert( skin, stateSet );
return stateSet;
}
}
osg::StateSet*
ResourceCache::getStateSet( SkinResource* skin )
{
osg::StateSet* result = 0L;
if ( _threadSafe )
{
// first check if it exists
{
Threading::ScopedReadLock shared( _mutex );
SkinCache::Record rec = _skinCache.get( skin );
if ( rec.valid() )
{
result = rec.value();
}
}
// no? exclusive lock and create it.
if ( !result )
{
Threading::ScopedWriteLock exclusive( _mutex );
// double check to avoid race condition
SkinCache::Record rec = _skinCache.get( skin );
if ( rec.valid() )
{
result = rec.value();
}
else
{
// still not there, make it.
result = skin->createStateSet( _dbOptions.get() );
if ( result )
_skinCache.insert( skin, result );
}
}
}
else
{
SkinCache::Record rec = _skinCache.get( skin );
if ( rec.valid() )
{
result = rec.value();
}
else
{
result = skin->createStateSet( _dbOptions.get() );
if ( result )
_skinCache.insert( skin, result );
}
}
return result;
}