CONTEXT SWITCH-SOME POINTS

A context switch (also sometimes referred to as a process switch or a task switch) is the switching of the CPU (central processing unit) from one process or thread to another.Context switching is an essential feature of multitasking operating systems. A multitasking operating system is one in which multiple processes execute on a single CPU seemingly simultaneously and without interfering with each other.
ACTIVITES OF CONTEXT SWITCH:
Context switching performing the following activities with regard to processes (including threads) on the CPU
(1) suspending the progression of one process and storing the CPU's state (i.e., the context) for that process somewhere in memory.
(2) retrieving the context of the next process from memory and restoring it in the CPU's .
(3) returning to the location indicated by the program counter (i.e., returning to the line of code at which the process was interrupted) in order to resume the process.
(4)A context switch can also occur as a result of a hardware interrupt.