3.2 Describe the actions taken by a kernel to context-switch between processes？

Key：In general,the operating  system must save the state of the currently running process and restore the state of the process scheduled to be run next.Saving the state of a process typically includes the values of all the registers in addition to memory allocation.Context switches must also perform many architecture-specific operations ,including flushing data and instruction caches.

3.6 Write a program u