多选题

知识点：操作系统 10/10（多选/必答） Which of the fo...

Question

知识点：操作系统 10/10（多选/必答）
Which of the following(s) are TRUE?

A. Context switch time is longer for kernel level threads than for user level threads

B. User level threads do not need any hardware support

C. Related kernel level threads can be scheduled on different processors in a multiprocessor system

D. Blocking one kernel level thread blocks all other related threads