Скачать или смотреть PROCESS STATE DIAGRAM | LONG TERM, SHORT TERM, MEDIUM TERM SCHEDULERS | OPERATING SYSTEM

In this video, I have discussed about process state diagram
00:00 - Introduction
00:32 - number of states in a process state diagram
00:52 - New state
01:36 - Ready state
02:48 - Types of scheduling mechanisms
06:28 - Suspended wait state
07:35 - Suspend ready state
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1. New State-



A process is said to be in new state when a program present in the secondary memory is initiated for execution.


2. Ready State-



A process moves from new state to ready state after it is loaded into the main memory and is ready for execution.
In ready state, the process waits for its execution by the processor.
In multiprogramming environment, many processes may be present in the ready state.


3. Run State-



A process moves from ready state to run state after it is assigned the CPU for execution.


4. Terminate State-



A process moves from run state to terminate state after its execution is completed.
After entering the terminate state, context (PCB) of the process is deleted by the operating system.


5. Block Or Wait State-



A process moves from run state to block or wait state if it requires an I/O operation or some blocked resource during its execution.
After the I/O operation gets completed or resource becomes available, the process moves to the ready state.


6. Suspend Ready State-



A process moves from ready state to suspend ready state if a process with higher priority has to be executed but the main memory is full.
Moving a process with lower priority from ready state to suspend ready state creates a room for higher priority process in the ready state.
The process remains in the suspend ready state until the main memory becomes available.
When main memory becomes available, the process is brought back to the ready state.


6. Suspend Wait State-



A process moves from wait state to suspend wait state if a process with higher priority has to be executed but the main memory is full.
Moving a process with lower priority from wait state to suspend wait state creates a room for higher priority process in the ready state.
After the resource becomes available, the process is moved to the suspend ready state.
After main memory becomes available, the process is moved to the ready state.