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Questions and Answers
What is the first thread to be executed in a process known as?
What must be created to start a child thread?
What state is a thread in before the Start method is called?
Which state represents a thread that is actively executing?
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What happens when a Running thread's job is finished?
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What is the purpose of the Abort method in the Thread class?
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Which of the following is true about threads within the same process?
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What delegate is used to represent a method that runs inside the Thread class?
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What happens to a thread when it enters the Blocked state?
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How does a Running thread return to the Started state?
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Which method is used to retrieve a waiting thread back to the Started state?
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What is the status of a thread that has not been started yet?
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What triggers a thread in the WaitSleepJoin state to return to its Started state?
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What happens when a thread calls another thread's Join method?
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In which state is a thread suspended temporarily?
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What method can a thread use to request a temporary pause in execution?
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Study Notes
Thread Class
- The Thread class is used to create and manage threads in C#.NET.
- Threads run independently and share memory space and state within a process.
Main Thread
- When a process starts, the first thread created is the main thread.
- It's responsible for handling initial operations.
Child Threads
- Child threads are created using the Thread class and are initiated from the main thread.
- To create a child thread, a ThreadStart delegate is used, which defines a method that runs within the thread context.
Thread States
- Unstarted: A thread is initialized but not yet started.
- Ready: A thread is ready to run but is waiting for CPU resources.
- Running: A thread is currently executing its code.
- WaitSleepJoin: A thread is temporarily suspended either by calling the Sleep() method or the Wait() method on a monitor.
- Started: A suspended thread resumes to a started state when the suspending condition is no longer met.
- Blocked: A thread is blocked when it's waiting for a resource or I/O operation.
- Stopped: A thread has finished its task or has been terminated.
Thread Control
- The Thread class provides methods to control its state and execution:
- Start(): Begins the execution of a thread.
- Abort(): Forces a thread to terminate, raising a ThreadAbortException.
- Sleep(): Pauses a thread's execution for a specified time.
- Join(): Causes a thread to wait for another thread to complete before proceeding.
Thread Life Cycle
- A thread progresses through different states during its life cycle:
- It starts as Unstarted.
- Then enters the Started (Ready/Runnable) state after invoking the Start() method.
- The highest priority thread in the Started state transitions to the Running state.
- A running thread becomes Stopped when it completes its task or is aborted.
- A running thread can enter the Blocked state when it needs to perform an I/O operation.
- After completing the I/O, the thread returns to the Started state.
- A thread may enter the WaitSleepJoin state by calling the Sleep() or Wait() methods.
- It returns to the Started state when the waiting condition is met or its interrupt method is called.
- A thread in the WaitSleepJoin state can also return to the Started state when another thread joins it.
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Description
This quiz covers the essential concepts of the Thread class in C#.NET, including the main thread, child threads, and various thread states. Test your knowledge on how threads operate within a process and manage their execution.
