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Introduction to Threads in C#

, 13 Apr 2004
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A Beginers introduction to Threads using C#

Introduction

This article will give you basic idea about how to create a Thread in C# and how to work on the created Thread.

Introduction to Threads In C#

Threads: Threads are often called lightweight processes. However they are not process.es A Thread is a small set of executable instructions, which can be used to isolate a task from a process. Multiple threads are efficient way to obtain parallelism of hardware and give interactive user interaction to your applications.

C# Thread:. . Net Framework has thread-associated classes in System.Threading namespace. The following steps demonstrate how to create a thread in C#.

Step 1. Create a System.Threading.Thread object.

Creating an object to System.Threading.Thread creates a managed thread in .Net environment. The Thread class has only one constructor, which takes a ThreadStart delegate as parameter. The ThreadStart delegate is wrap around the callback method, which will be called when we start the thread.

Step 2: Create the call back function

This method will be a starting point for our new thread. It may be an instance function of a class or a static function. Incase of instance function, we should create an object of the class, before we create the ThreadStart delegate. For static functions we can directly use the function name to instantiate the delegate. The callback function should have void as both return type and parameter. Because the ThreadStart delegate function is declared like this. (For more information on delegate see MSDN for “Delegates”).

Step 3: Starting the Thread.

We can start the newly created thread using the Thread’s Start method. This is an asynchronous method, which requests the operating system to start the current thread.

For Example:

 
// This is the Call back function for thread.           

Public static void MyCallbackFunction()

{
while (true)

  {
  System.Console.WriteLine(“ Hey!, My Thread Function Running”);

………

  } 

}

public static void Main(String []args)

{

// Create an object for Thread

Thread MyThread = new Thread(new ThreadStart 
(MyCallbackFunction));

MyThread.Start()

……

}


Killing a Thread:

We can kill a thread by calling the Abort method of the thread. Calling the Abort method causes the current thread to exit by throwing the ThreadAbortException.
MyThread.Abort(); 

Suspend and Resuming Thread:

We can suspend the execution of a thread and once again start its execution from another thread using the Thread object’s Suspend and Resume methods.

  MyThread.Suspend() // causes suspend the Thread Execution. 
  MyThread.Resume() // causes the suspended Thread to resume its execution.
 

Thread State:

A Thread can be in one the following state.


Thread State

Description

Unstarted

Thread is Created within the common language run time but not Started still.

Running

After a Thread calls Start method

WaitSleepJoin

After a Thread calls its wait or Sleep or Join method.

Suspended

Thread Responds to a Suspend method call.

Stopped

The Thread is Stopped, either normally or Aborted.


We can check the current state of a thread using the Thread’s ThreadState property.

Thread Priorty:

The Thread class’s ThreadPriority property is used to set the priority of the Thread. A Thread may have one of the following values as its Priority:  Lowest, BelowNormal, Normal, AboveNormal, Highest. The default property of a thread is Normal.

By Mohamed Hasan S.

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About the Author

hasansheik
Technical Lead GE Healthcare
India India
Hey, I am mohamed hasan. Working as a software engineer in a India based Software Company.
Willing to learn new concepts and technologies.
 
Contact him at: hasansheik@gmail.com
hasansheik@yahoo.co.in

Comments and Discussions

 
QuestionThread Problem Pinmemberpramodkumarw30-May-13 7:26 
AnswerRe: Thread Problem PinprofessionalMarco Bertschi7-Nov-13 2:42 
GeneralMy vote of 4 Pinmembershani_75926-Dec-12 19:44 
GeneralMy vote of 1 Pinmembermlzg425-Jun-12 1:38 
GeneralRe: My vote of 1 PinprofessionalMarco Bertschi7-Nov-13 2:43 
GeneralMy vote of 3 PinmemberIlham Israfilov12-Apr-12 9:17 
GeneralMy vote of 1 PinmemberusernameCasper11-Jan-11 9:18 
GeneralPassing parameters PinmemberMember 27242142-Mar-10 2:15 
GeneralIt is a thread function not a callback PinmemberJon Burchel2-Jul-08 17:08 
GeneralNeeds Threads URL. PinsussH.Mohamed Zakir11-Dec-07 18:04 
GeneralRe: Needs Threads URL. Pinmemberraju_Code27-Oct-09 1:15 
QuestionRegistring Callback Function Pinmembershahid hameed3-Aug-07 3:15 
QuestionProblem in threading Pinmembernmehta00521-Mar-07 6:46 
AnswerRe: Problem in threading Pinmembermhejle13-Sep-07 20:32 
AnswerRe: Problem in threading Pinmembercarlmalden30-Sep-08 7:01 

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