At last, I added a branch in CVS and started to implement new GC.
Because the thesis’ deadline is the begining of next month,
I must say that it’s too late to start.
For the time being, I added the write-barrior to latest 1.9 today.
It has advanced steadily because Mr. Kiyama’s write-barrior implementation is very helpful.
If everything goes alright, it is in time possibly.