Multithreading
- 1. V.SAKTHIPRIYA II-MSC(IT) NADAR SARASWATHI COLLEGE OF ARTS AND SCIENCE
- 2. INTRODUCTION: Multithreading enables your Visual Basic program to perform concurrent processing so that you can do more than one operation at a time happening is that is divided by the computer into slices, and start a new thread ,that thread gets some time slices which means that threads code can execute. Visual Basic program to perform concurrent processing so that you can do more than one operation at a time.
- 3. THREAD PROPERTIES: Threads enable your program to perform concurrent processing. The .NET Framework System. Threading namespace makes using threads easier. Threads share the application's resources. For more information, see Using Threads and Threading.
- 4. CREATING A THREAD: create a new thread by declaring a variable of type Thread and calling the constructor, providing the name of the procedure or method that you want to execute on the new thread. Dim newThread As New System.Threading.Thread(AddressOf AMethod)
- 5. STARTING A THREAD: To start the execution of a new thread, use the Start method, as shown in the following code newThread.Start()
- 6. STOPPING A THREAD To stop the execution of a thread, use the Abort method, as shown in the following code. newThread.Abort() Besides starting and stopping threads, you can also pause threads by calling the Sleep or Suspend method, resume a suspended thread by using the Resume method, and destroy a thread by using the Abort method
- 7. THREAD METHODS: METHOD ACTION Start Causes a thread to start to run. sleep Pauses a thread for a specified time suspend Pauses a thread when it reaches a safe point. abort Stops a thread when it reaches a safe point. resume Restarts a suspended thread join Causes the current thread to wait for another thread to finish. If used with a time-out value, this method returns True if the thread finishes in the allocated
- 8. THREAD PROPERTIES: PROPERTY VALUE IsAlive Contains the value True if a thread is active IsBackground Gets or sets a Boolean that indicates if a thread is or should be a background thread. Background threads are like foreground threads, but a background thread does not prevent a process from stopping. Once all foreground threads that belong to a process have stopped, the common language runtime ends the process by calling the Abort method on background threads that are still alive.
- 9. CON… Name Gets or sets the name of a thread. Most frequently used to discover individual threads when you debug. Priority Gets or sets a value that is used by the operating system to prioritize thread scheduling. Thread state Contains a value that describes a thread's state or states.
- 10. SETTING A THREAD’S PRIORITY Threads are scheduled for execution based on their priority. Above normal-gives a thread higher priority. Below normal-gives a thread lower priority. Highest-gives a thread highest priority. Lowest-gives a thread lowest priority. Normal-gives a thread average priority.
- 11. DETERMINING THREAD STATE The thread state property gives you information about the status of a thread. Initialized-the thread was initialized , but it hasn’t started. Ready- the thread is ready. Running-the thread is running. Standby-the thread is on standby. Terminated-the thread has terminated. Transition-the thread is in transition between two states. Unknown-the thread state is unknown. Wait-the thread is waiting.