Threading FAQ's

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1. What is Multi-tasking ?

Its a feature of modern operating systems with which we can run multiple programs atsame time example Word,Excel etc.

2. What is Multi-threading ?

Multi-threading forms subset of Multi-tasking instead of having to switch between programsthis feature switches between different parts of the same program.Example you are writingin word and at the same time word is doing a spell check in background.

3. What is a Thread ?

A thread is the basic unit to which the operating system allocates processor time.

4. Did VB6 support multi-threading ?

While VB6 supports multiple single-threaded apartments, it does not support a freethreadingmodel, which allows multiple threads to run against the same set of data.

5. Can we have multiple threads in one App domain ?

One or more threads run in an AppDomain. An AppDomain is a runtime representationof a logical process within a physical process.Each AppDomain is started with a singlethread, but can create additional threads from any of its threads.

6. Which namespace has threading ?

Systems.Threading has all the classes related to implement threading.Any .NET applicationwho wants to implement threading has to import this namespace.

7. How can we change priority and what the levels of priority areprovided by .NET ?

Thread Priority can be changed by using Threadname.Priority = ThreadPriority.Highest.Inthe sample provided look out for code where the second thread is ran with a high priority. Following are different levels of Priority provided by .NET :- √ ThreadPriority.Highest √ ThreadPriority.AboveNormal √ ThreadPriority.Normal √ ThreadPriority.BelowNormal √ ThreadPriority.Lowest

8. What does Addressof operator do in background ?

The AddressOf operator creates a delegate object to the BackgroundProcess method. Adelegate within VB.NET is a type-safe, object-oriented function pointer. After the threadhas been instantiated, you begin the execution of the code by calling the Start() methodof the thread.

9. How can you reference current thread of the method ?

"Thread.CurrentThread" refers to the current thread running in themethod."CurrentThread" is a public static property.

10. What's Thread.Sleep() in threading ?

Thread's execution can be paused by calling the Thread.Sleep method. This method takesan integer value that determines how long the thread should sleep.ExampleThread.CurrentThread.Sleep(2000).

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