question on THREADINIT

[Andrew S Halper, Computer Specialist, Tucson, AZ]

Hello,

I am in the process of attempting to port Kaffe to DG/UX m88k.  I'm
almost done with the thread switching code, but I'm having difficulty
understanding the THREADINIT macro.  Could someone briefly explain the
general idea behind this bit of code?

Thanks,
Andy Halper