[kccqzy]

We are not disagreeing here. Your citation is actually not relevant: Boehm is arguing that you cannot implement threads as libraries in a language without threading. But all modern languages actually have OS native threads; the addition of green threads to this environment does not require any further changes to the compiler in addition to what has been changed to support OS threads. If anything, green threads are even easier to support than real OS threads depending on the preemption design.