Multi-threading & Task Parallel Library - II

How Threading works

• Multi threading is managed by thread scheduler, a function CLR delegates to operating system.
• On a single-processor computer, a thread scheduler performs time-slicing — rapidly switching execution between each of the active threads.
• On a multi-processor computer, multi-threading is implemented with a mixture of time-slicing and genuine concurrency, where different threads run code simultaneously on different CPUs. It’s almost certain there will still be some time-slicing, because of the operating system’s need to service its own threads — as well as those of other applications.
• A thread is said to be preempted when its execution is interrupted due to an external factor such as time-slicing. In most situations, a thread has no control over when and where it’s preempted.
• A thread is the basic unit to which the operating system allocates processor time.
• A process, in the simplest terms, is an executing program which provides resource to running thread.

Different ways to cretate thread and invoke it.

Using Delegate

Public delegate void Threadstart()

Thread t = new Thread(new Threadstart(MethodName())

t.start();

Directly via Method name

Thread t = new Thread( MethodName())

t.start();

Using Lambda Expression

Thread t = new Thread ( () => Console.WriteLine ("Hello!") );
 t.Start();