Describe the difference between a Thread and a Process?

[vadivelanvaidyanathan]

Describe the difference between a Thread and a Process?

[lavanya]

THREAD:
Thread is used to execute more than one program at a time.

Difference:

• Each threads belongs to one process
  
• Thread shrares the address space of the process that created it.
  
• Threads have direct access to the data segment of its process
  
• Threads can directly communicate with other threads of its process
  
• New threads are easily created

PROCESS:
Process executes the single program

Difference:

• Each process has one or more threads.
  
• Process have their own address
• Processes have their own copy of the data segment of the parent process.
  
• Processes must use interprocess communication to communicate with sibling processes.
  
• New processes require duplication of the parent process.

[krishnakumar]

Hi,
I came to know about multithread concept in java and has two types to create it.. Can u give idea about multithread...


Thanks in Advance

[Venkat]

hey,

Multithreaded applications provide the illusion that numerous activities are happening at more or less the same time. In C# the System. Threading namespace provides a number of types that enable multithreaded programming.

Whenever an application runs, it runs under a main thread. However, running a single thread can sometimes lead to unnecessary performance and locking issues. So if the application can be broken into multiple threads without hampering the flow of the main thread, then using it is always better.

n .NET, the threading is handled through the System.Threading namespace.

Creating a variable of the System.Threading.Thread type allows you to create a new thread to start working with.

It is clear to everybody that the concept of threading is to go off and do another task. The Thread constructor requires the address of the procedure that will do the work for the thread.

The AddressOf is the parameter that the constructor needs to begin using the thread.

Below is an example of a simple threading application.

Listing 1

Imports System.Threading
Public Class Form1
Inherits System.Windows.Forms.Form

Dim th1 As Thread
Dim th2 As Thread

Private Sub Form1_Load(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles MyBase.Load
th1 = New Thread(AddressOf proc1)
th2 = New Thread(AddressOf proc2)

th1.Start()
th2.Start()
End Sub

Sub proc1()
Dim iCount As Integer
For iCount = 1 To 10
cmb1.Items.Add(iCount)
Next
End Sub
Sub proc2()
Dim iCount As Integer
For iCount = 11 To 20
cmb2.Items.Add(iCount)
Next
End Sub
End Class