Consider the following statements with respect to user-level threads and kernel supported threads
(i). context switch is faster with kernel-supported threads
(ii). for user-level threads, a system call can block the
(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) and (iv) only
(B) (ii) and (iii) only
(C) (i) and (iii) only
(D) (i) and (ii) only
→ The user-level thread context switch is faster than kernel-level threads. Statement (i) is false.
→ If one user-level thread performs a blocking operation then the entire process will be blocked. Statement (ii) is true.
→ User-level threads are threads that are transparent to the kernel. Because user-level threads are created by users. Statement (iv) is true.
→ Kernal-supported threads can be scheduled independently, which is based on OS. Statement (iii) is true.