Thread Life Cycle and States
21 Questions
1 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What method is used for a thread to wait for another thread to finish execution?

  • Sleep
  • Monitor
  • Join (correct)
  • PulseAll

    • What happens to a thread when its sleeping duration expires?

  • It returns to the Started state. (correct)
  • It enters the Blocked state.
  • It stops execution.
  • It moves to the Ready state.

    • Which state does a thread enter when it is temporarily suspended due to the Sleep method?

  • Running
  • Ready
  • WaitSleepJoin (correct)
  • Blocked

    • What does the Pulse method do with waiting threads?

    <p>Moves the next waiting thread back to the Started state. (C)</p> Signup and view all the answers

    Which method is NOT directly involved in moving threads between states?

    <p>Terminate (B)</p> Signup and view all the answers

    What exception is thrown when a child thread is aborted?

    <p>ThreadAbortException (C)</p> Signup and view all the answers

    Which property would you use to determine if a thread is still executing?

    <p>IsAlive (C)</p> Signup and view all the answers

    What state does the ThreadState property indicate for a thread that is currently paused?

    <p>WaitSleepJoin (A)</p> Signup and view all the answers

    Which method is used to pause the execution of a thread for a specified period?

    <p>Thread.Sleep() (A)</p> Signup and view all the answers

    What will happen to a ThreadAbortException after it is caught in a catch block?

    <p>It is rethrown at the end of the catch block. (A)</p> Signup and view all the answers

    How would you check if a thread is a background thread?

    <p>Using the IsBackground property (D)</p> Signup and view all the answers

    Which of the following is NOT a property of the Thread class?

    <p>Lifetime (B)</p> Signup and view all the answers

    In which scenario would a thread perform better with a higher priority?

    <p>When needing quick responsiveness (B)</p> Signup and view all the answers

    What state does a thread enter after the Start method is called?

    <p>Started (B)</p> Signup and view all the answers

    Which method can cause a Running thread to terminate abruptly?

    <p>Abort (A)</p> Signup and view all the answers

    A thread that is waiting for I/O operations to complete enters which state?

    <p>Blocked (A)</p> Signup and view all the answers

    What allows a Running thread to return to the Started state from the WaitSleepJoin state?

    <p>Monitor.Pulse method (B)</p> Signup and view all the answers

    In which state does the CPU not allocate time to a thread?

    <p>Blocked (D)</p> Signup and view all the answers

    Which of the following describes a thread's lifecycle correctly in order of state transitions?

    <p>Unstarted → Started → Running → Blocked (C)</p> Signup and view all the answers

    When does a Running thread enter the WaitSleepJoin state?

    <p>When it is asked to sleep or to wait (C)</p> Signup and view all the answers

    What happens when a thread's job is completed while it is in the Running state?

    <p>It enters the Stopped state (C)</p> Signup and view all the answers

    Study Notes

    Thread Life Cycle & States

    • A thread can be in different states throughout its execution.

    Unstarted

    • A newly created thread in the Common Language Runtime (CLR) is in the Unstarted state and does not begin executing immediately.

    Started (Ready or Runnable)

    • The thread transitions to the Started state (also referred to as Ready or Runnable) when the Start method is invoked.

    Running

    • The highest priority Started thread enters the Running state and is actively executing.

    Stopped

    • A Running thread enters the Stopped state when its job or task is completed.

    Aborted

    • A Running thread can be forcefully terminated by calling the Abort method. This throws a ThreadAbortException, which, if caught, is automatically rethrown at the end of the catch block.

    Blocked

    • A Running thread enters the Blocked state when it initiates an input/output (I/O) request. The CPU time is not allocated to a Blocked thread while it performs I/O operations.

    WaitSleepJoin

    • A Running thread can enter the WaitSleepJoin state:
      • By invoking the Sleep method to pause for a specified duration
      • By invoking the Monitor.Wait method for synchronization.

    Resuming from WaitSleepJoin

    • A thread can resume from the WaitSleepJoin state:
      • When the sleep duration in the Sleep method expires.
      • When another thread calls the Monitor.Pulse method to move the next waiting thread back to the Started state.
      • When another thread calls the Monitor.PulseAll method to move all waiting threads back to the Started state.
      • When another thread calls the waiting thread's Interrupt method.

    Joining Threads

    • If a thread's execution depends on the completion of another thread, it can call that thread's Join method. This causes the waiting thread to remain in the WaitSleepJoin state until the joined thread finishes executing.

    Thread Properties

    • The Thread class provides several properties:
      • CurrentThread: Returns the current thread executing.
      • IsAlive: Indicates whether the thread is currently running.
      • IsBackground: Indicates whether the thread is a background thread.
      • Name: Gets or sets the thread's name.
      • Priority: Gets or sets the thread's priority.
      • ThreadState: Gets the thread's current state.

    Sample Code Example

    • The code demonstrates:
      • Creating and starting a child thread using ThreadStart and Thread.
      • Accessing the Thread.CurrentThread property to identify the main thread.
      • Utilizing the Thread.Sleep method to pause execution.
      • Handling the ThreadAbortException in a catch block.
      • Illustrating the finally block for cleanup tasks.

    Managing Thread Execution

    • Employ Thread methods for controlling thread execution:
      • Start: Begin execution.
      • Abort: Stop execution forcefully.
      • Join: Wait for a thread to complete.
      • Sleep: Suspend execution for a specified duration.
      • Interrupt: Interrupt a waiting thread.

    Practical Implications

    • The provided code illustrates practical aspects of multithreading in .NET applications, focusing on how to create, manipulate, and monitor threads. It demonstrates fundamental concepts like creating child threads, controlling their execution, and dealing with exceptions.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Related Documents

    Exception Handling in C# PDF

    Description

    Explore the different states a thread can enter during its lifecycle in the Common Language Runtime (CLR). From Unstarted to Running, and how threads can transition to Stopped or Aborted states, this quiz will enhance your understanding of thread management and execution flow.

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser