GATE Overflow Test Series | Operating Systems | Test 1 | Question: 3

Question

Which of the following is/are correct? (Mark all the appropriate choices)

• A. Kernel-level threads are handled by the operating system directly
• B. Kernel level threads are faster to create and manage than user level threads
• C. Multiple threads of the same process can be scheduled on different processors in kernel-level threads.
• D. If a kernel-level thread is blocked, all threads of the same process also gets blocked

Answer 1

A mode switch to kernel mode is required to transfer control from one thread to another in a process. So, a kernel-level thread is slower to create and manage than a user level thread.So option B is false.

Also, since kernel is managing the threads if a kernel level thread gets blocked, the kernel can schedule another thread of the same process which is not the case for user level threads.

Correct Answer: A;C