Two user-level thread to kernel-level thread mapping schemes are shown in picture below (a) and (b).

(i). Describe the effect on the process when the user thread 2 in the picture(a) causes a system call.

(ii). Describe the impact on the process when the user thread 4 in the picture(b) causes a system call.

(iii). Describe the advantages of the thread mapping scheme in the picture(b).

(iv). Describe how the OS converts user threads into kernel threads.

User threads (2) (3) (4) User threads (2) (3) (4) (1) (1) ma Im (4) (1) (3) k k k k (a) Kernel thread (b) Kernel threads