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This module describes the basics of Microsoft Visual Basic Threads and Semaphores.

Introduction

Microsoft Visual Basic provides resources for managing threads and semaphores. This module will give a basic overview of threads and semaphores in Visual Basic (VB). This module presents threads and semaphores in VB in a very simplistic manner. There are much better ways to use threads in VB but they will be presented here in a way that makes the programs much easier to write. The threads described here will be methods of the Form class. This is what makes the programming very simple. Threads should/could be classes on their own but it is not necessary. This module is not intended to make you proficient in using threads and semaphores in Visual Basic.

Reading

Module prerequisites

It would be helpful to have completed the TSK and SEM modules for the DSP/BIOS operating system but it is not necessary if you are familiar with tasks and semaphores.

Visual basic threads

A thread is simply a separate method or function that gets executed apart from the main program flow. There can be many threads executing simultaneously in a system. In VB the System.Threading namespace needs to be imported into the program. This is done by putting the following at the very top of your code:

Imports System.Threading

If this is not included at the top of your program then it will not know what threads are.

The following is the basic structure of your program for this lab. Each part of the example code is described in the comments.

' This imports the threading namespace so the program knows about threads Imports System.Threading' This is the class that executes the form for the programPublic Class Form1 ' This is a definition of a thread. The thread object is thread1 and' it uses the method Task1() below as its code. Dim thread1 As New Thread(AddressOf Task1)' When the form program starts or is loaded the following function is' called. This is where you can put the commands to set up our program. ' The code for starting up the threads can be put here.Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load' Make this a background thread so it automatically ' aborts when the main program stops.thread1.IsBackground = True ' Set the thread prioritythread1.Priority = ThreadPriority.Lowest ' This command starts the thread. The method Task1() then' starts to execute. thread1.Start()End SubPrivate Sub Task1() ' This is where your code goes for this threadEnd SubEnd Class

The real-time operating system in Visual Studio is not a deterministic operating system. This means that you cannot be sure of how the threads will execute. Windows assigns time to threads at the same priority in a round-robin fashion. When threads at a particular level do not need to execute the operating system assigns time to lower priority threads.

Questions & Answers

what does preconceived mean
sammie Reply
physiological Psychology
Nwosu Reply
How can I develope my cognitive domain
Amanyire Reply
why is communication effective
Dakolo Reply
Communication is effective because it allows individuals to share ideas, thoughts, and information with others.
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miss
Every time someone flushes a toilet in the apartment building, the person begins to jumb back automatically after hearing the flush, before the water temperature changes. Identify the types of learning, if it is classical conditioning identify the NS, UCS, CS and CR. If it is operant conditioning, identify the type of consequence positive reinforcement, negative reinforcement or punishment
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Wekolamo
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ARC
A child is a member of community not society elucidate ?
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Isn't practices worldwide, be it psychology, be it science. isn't much just a false belief of control over something the mind cannot truly comprehend?
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compare and contrast skinner's perspective on personality development on freud
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Skinner skipped the whole unconscious phenomenon and rather emphasized on classical conditioning
war
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Amesalu Reply
nature is an hereditary factor while nurture is an environmental factor which constitute an individual personality. so if an individual's parent has a deviant behavior and was also brought up in an deviant environment, observation of the behavior and the inborn trait we make the individual deviant.
Samuel
I am taking this course because I am hoping that I could somehow learn more about my chosen field of interest and due to the fact that being a PsyD really ignites my passion as an individual the more I hope to learn about developing and literally explore the complexity of my critical thinking skills
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interpersonal relationships
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What would be the best educational aid(s) for gifted kids/savants?
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Saurabh
What are the treatment for autism?
Magret Reply
hello. autism is a umbrella term. autistic kids have different disorder overlapping. for example. a kid may show symptoms of ADHD and also learning disabilities. before treatment please make sure the kid doesn't have physical disabilities like hearing..vision..speech problem. sometimes these
Jharna
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Source:  OpenStax, Ti dsp/bios lab. OpenStax CNX. Sep 03, 2013 Download for free at http://cnx.org/content/col11265/1.8
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