Basic CS [TCS Placement]: Sample Questions 119 - 119 of 196

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Question 119

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Describe in Detail

Essay▾

Define the process life cycle

Explanation

  • When a process executes, it passes through different states.
  • These stages may differ in different operating system, and the names of these states are also not standardized.
  • Process can have one of the following five states at a time.
  • States:
    1. New
    2. Running
    3. Ready
    4. Waiting
    5. Terminated
Given the Image Define the Process Can Have One of the Following Five States at a Time
Table of State and Its Description
StateDescription
StartThis is the initial state when a process is first started or created.
Ready
  • The process is waiting to be assigned to a processor.
  • Ready processes are waiting to have the processor allocated to them by the operating system so that they can run.
  • Process may come into this state after Start state or while running it by but interrupted by the scheduler to assign CPU to some other process.
RunningOnce the process has been assigned to a processor by the OS scheduler, the process state is set to running and the processor executes its instructions.
WaitingProcess moves into the waiting state if it needs to wait for a resource, such as waiting for user input, or waiting for a file to become available.
TerminatedOnce the process finishes its execution, or it is terminated by the operating system, it is moved to the terminated state where it waits to be removed from main memory.

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