Which Linux JDK ports use native threads and which use green threads?

Of the JDK1.3 releases:

• The IBM JDK1.3 uses native threads
• The Sun JDK1.3 uses native threads if you run the HotSpot VM (default behavior), but you can use green threads by running the classic VM with the command java -classic ...
• The Blackdown JDK1.3 uses native threads by default, but can use green threads by running the VM with the command java -classic...