A context switch occurs when a state of process changes from new to ready
True or False
Answers
Answer:
Context switching changes the process mode from user to kernel mode and kernel to user mode.
User and kernel mode switching:- When a transition between user mode and kernel mode is required in an operating system, a context switch is not necessary; a mode transition is not by itself a context switch. However, depending on the operating system, a context switch may also take place at this time.
Context switch:-
A context switch occurs when the kernel transfers control of the CPU from an executing process to another that is ready to run. The kernel first saves the context of the process. The context is the set of CPU register values and other data that describes the process state.
Kernel and user mode:-
Kernel mode is generally reserved for the lowest-level, most trusted functions of the operating system. Crashes in kernel mode are catastrophic; they will halt the entire PC. In user mode, the executing code has no ability to directly access hardware or reference memory.