I think Solaris moved from green threads to pure kernel threads at the same time (https://docs.oracle.com/cd/E19253-01/816-5137/mtintro-75924/index.html https:/

I think Solaris moved from green threads to pure kernel threads at the same time (https://docs.oracle.com/cd/E19253-01/816-5137/mtintro-75924/index.html https://docs.oracle.com/cd/E19253-01/816-5137/mtintro-75924/... says Solaris 9 was the transition point).