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Consider the following statements with respect to user-level threads and Kernel-supported threads
(i) Context switching is faster with Kernel- supported threads.
(ii) For user-level threads, a system call can block the entire process.
(iii) Kernel-supported threads can be scheduled independently.
(iv) User-level threads are transparent to the Kernel.
Which of the above statements are true?
  • a)
    (ii), (iii), (iv) only
  • b)
    (ii) and (iii) only
  • c)
    (i) and (iii) only
  • d)
    (i) and (ii) only
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Consider the following statements with respect to user-level threads a...
Kernel level threads can be scheduled independently. For user level threads a system call can block the entire process and are not transparent to Kernel.
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Consider the following statements with respect to user-level threads a...
Explanation:

(i) Context switching is faster with Kernel-supported threads.
In the case of Kernel-supported threads, context switching involves switching between different threads at the Kernel level. The Kernel is responsible for managing the scheduling and execution of these threads. Since the Kernel has direct control over the threads, context switching can be done more efficiently and quickly. Therefore, statement (i) is true.

(ii) For user-level threads, a system call can block the entire process.
User-level threads are managed by the user-level thread library and are not directly visible to the Kernel. When a user-level thread makes a system call, it blocks only the calling thread and not the entire process. The other threads within the process can continue execution independently. Therefore, statement (ii) is true.

(iii) Kernel-supported threads can be scheduled independently.
In the case of Kernel-supported threads, each thread is scheduled independently by the Kernel. The Kernel can allocate CPU time to each thread based on its scheduling algorithm. Each thread can execute in parallel and is not dependent on other threads within the same process. Therefore, statement (iii) is true.

(iv) User-level threads are transparent to the Kernel.
User-level threads are not visible or managed by the Kernel. The Kernel treats the entire process as a single entity and is unaware of the individual user-level threads within it. The Kernel schedules and manages the process as a whole, without any knowledge of the user-level threads. Therefore, statement (iv) is true.

Therefore, the correct answer is option B: (ii) and (iii) only.
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Consider the following statements with respect to user-level threads and Kernel-supported threads(i) Context switching is faster with Kernel- supported threads.(ii) For user-level threads, a system call can block the entire process.(iii) Kernel-supported threads can be scheduled independently.(iv) User-level threads are transparent to the Kernel.Which of the above statements are true?a)(ii), (iii), (iv) onlyb)(ii) and (iii) onlyc)(i) and (iii) onlyd)(i) and (ii) onlyCorrect answer is option 'B'. Can you explain this answer?
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