if (cY < 0 || cY >= WORLD_HEIGHT >> Chunk.BLOCKS.BITS) {
return;
}
TSyncIntHashSet column = initChunks.get(x, z);
if (column == null) {
column = new TSyncIntHashSet();
synchronized (initChunkLock) {
TSyncIntHashSet oldColumn = initChunks.putIfAbsent(x, z, column);
if (oldColumn != null) {
column = oldColumn;
}
}
}