t1.Start()

Detailed example is as below

namespace Programming_CSharp
{
using System;
using System.Threading;
class Tester
{
static void Main( )
{
// make an instance of this class
Tester t = new Tester( );
// run outside static Main
t.DoTest( );
}
public void DoTest( )
{
// create a thread for the Incrementer
// pass in a ThreadStart delegate
// with the address of Incrementer
Thread t1 =new Thread(new ThreadStart(Incrementer) );
// create a thread for the Decrementer
// pass in a ThreadStart delegate
// with the address of Decrementer
Thread t2 =new Thread(new ThreadStart(Decrementer) );
// start the threads
t1.Start( );
t2.Start( );
}
// demo function, counts up to 1K
public void Incrementer( )
{
for (int i =0;i<1000;i++)
{
Console.WriteLine("Incrementer: {0}", i);
}
}
// demo function, counts down from 1k
public void Decrementer( )
{
for (int i = 1000;i>=0;i--)
{
Console.WriteLine("Decrementer: {0}", i);
}
}
}
}

Output:

Incrementer: 102
Incrementer: 103
Incrementer: 104
Incrementer: 105
Incrementer: 106
Decrementer: 1000
Decrementer: 999
Decrementer: 998
Decrementer: 997

Joining Threads

Once thread starts running and in a situation when we need to tell thread to stop processing and wait until a second thread to complete the processing we need to join the 1st thread to the 2nd thread. Use following for the same. This will join the second thread to the 1st.

Example:

t2.Join( )

Suspending Thread

In a situation we some time needs to suspend running thread.

Example:

t2.Sleep(<No of Seconds>)

Killing Thread

Threads has to die after the execution of the process in normal situations, occasionally it is required for the programmer to kill a thread. Threads can be killed using the following.

Example:

t2.Abort()

Advanced Threading

Synchronization

Recollect the discussion we had before in some situations we need to synchronize the running threads, so we can modify the running thread and its resources.

namespace Programming_CSharp
{
using System;
using System.Threading;
class Tester
{
private int counter = 0;
static void Main( )
{
// make an instance of this class
Tester t = new Tester( );
// run outside static Main
t.DoTest( );
}
public void DoTest( )
{
Thread t1 = new Thread( new ThreadStart(Incrementer) );
t1.IsBackground=true;
t1.Name = "ThreadOne";
t1.Start( );
Console.WriteLine("Started thread {0}",
t1.Name);
Thread t2 = new Thread( new ThreadStart(Incrementer) );
t2.IsBackground=true;
t2.Name = "ThreadTwo";
t2.Start( );
Console.WriteLine("Started thread {0}",
t2.Name);
t1.Join( );
t2.Join( );
// after all threads end, print a message
Console.WriteLine("All my threads are done.");
}
// demo function, counts up to 1K
public void Incrementer( )
{
try
{
while (counter < 1000)
{
int temp = counter;
temp++; // increment
// simulate some work in this method
Thread.Sleep(1);
// assign the decremented value
// and display the results
counter = temp;
Console.WriteLine("Thread {0}. Incrementer: {1}",Thread.CurrentThread.Name,counter);
}
}
catch (ThreadInterruptedException)
{
Console.WriteLine("Thread {0} interrupted! Cleaning up...",Thread.CurrentThread.Name);
}
finally
{
Console.WriteLine("Thread {0} Exiting. ",Thread.CurrentThread.Name);
}
}
}
}

Output:

Started thread ThreadOne
Started thread ThreadTwo
Thread ThreadOne. Incrementer: 1
Thread ThreadOne. Incrementer: 2
Thread ThreadOne. Incrementer: 3
Thread ThreadTwo. Incrementer: 3
Thread ThreadTwo. Incrementer: 4
Thread ThreadOne. Incrementer: 4
Thread ThreadTwo. Incrementer: 5
Thread ThreadOne. Incrementer: 5
Thread ThreadTwo. Incrementer: 6
Thread ThreadOne. Incrementer: 6

Using Interlock

MS CLR provides synchronization tools and mechanisms. This will allow programmers to place locking over running threads.

VB provides a special class called interlocked just for the reason of locking. This consists of two methods Increment and Decrement.

Example: