GATE - 2014 | OS | Which one of the following is FALSE? User level threads are not

GATE - 2014 | OS | Which one of the following is FALSE? User level threads are not
Posted on 10-02-2022

GATE - 2014 [Operating System]

Question:

Which one of the following is FALSE?

A

User level threads are not scheduled by the kernel.

B

When a user level thread is blocked, all other threads of its process are blocked.

C

Context switching between user level threads is faster than context switching between kernel level threads.

D

Kernel level threads cannot share the code segment.

  

Solution:

Option (D) is Correct.

Kernel-level threads share the code segment.

User-level thread Kernel level thread
User threads are implemented by user processes. kernel threads are implemented by OS.
OS doesn’t recognize user-level threads. Kernel threads are recognized by OS.
Implementation of User threads is easy. Implementation of the 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 performs a blocking operation then the entire process will be blocked. If one kernel thread performs a blocking operation then another thread can continue execution.
Example: Java thread, POSIX threads. Example: Window Solaris.
Thank You

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