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下列哪一项关于用户级和内核级线程的说法是不正确的？

[单选题]

用户级线程不需要任何硬件支持

阻塞一个内核级线程就会阻塞所有相关的线程

用户级线程的上下文切换时间比内核级线程要少

可以在多处理器系统中的不同处理器上调度相关的内核级线程

查看答案及解析

暮若清风

USER LEVEL THREAD	KERNEL LEVEL THREAD
User thread are implemented by users.	kernel threads are implemented by OS.
OS doesn’t recognized user level threads.	Kernel threads are recognized by OS.
Implementation of User threads is easy.	Implementation of Kernel thread is complicated.
Context switch time is less.	Context switch time is more.
Context switch requires no hardware support.	Hardware support is needed.
If one user level thread perform blocking operation then entire process will be blocked.	If one kernel thread perform blocking operation then another thread can continue execution.