Assume val is an atomic integer in a Linux system. What is the value of variable val after the following operations have been completed: atomc_set(&val, 30); atomic_dec(&val); atomic_add(25, &val); atomic_sub(15,&val); Write code to implement any one of the above mentioned function using the CAS instruction. When a process (assume A) signals condition variable (x.signal), another process (assume B) suspended on condition variable x, explain the alternate possibilities to ensure synchronization within monitor. Illustrate with code fragment using Pthread condition variable, how a thread can wait for a condition (a+b)== 25 (shared initial values of a=5, b=0), another thread increment the shared data a and b. Compare wait() and signal () operation with semaphore and wait() and signal() operation with condition variable.