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vb.net qr code reader free PARALLELIZATION AND THREADING ENHANCEMENTS in Visual Basic .NET
PARALLELIZATION AND THREADING ENHANCEMENTS QR Code Generator In VB.NET Using Barcode generation for .NET framework Control to generate, create Denso QR Bar Code image in VS .NET applications. www.OnBarcode.comDenso QR Bar Code Recognizer In VB.NET Using Barcode recognizer for .NET framework Control to read, scan read, scan image in VS .NET applications. www.OnBarcode.comConcurrent Collections
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BlockingCollection is a collection that enforces upper and lower boundaries in a thread-safe manner. If you attempt to add an item when the upper or lower bounds have been reached, the operation will be blocked, and execution will pause. If on the other hand, you attempt to remove an item when the BlockingCollection is empty, this operation will also be blocked. This is useful for a number of scenarios, such as the following: Increasing performance by allowing threads to both retrieve and add data from it. For example, it could read from disk or network while another processes items. Preventing additions to a collection until the existing items are processed. The following example creates two threads: one that will read from the blocking collection and another to add items to it. Note that we can enumerate through the collection and add to it at the same time, which is not possible with previous collection types. PARALLELIZATION AND THREADING ENHANCEMENTS
CAUTION It is important to note that the enumeration will continue indefinitely until the CompleteAdding() method is called. using using using using using using using using using
System; System.Collections.Generic; System.Linq; System.Text; System.Dynamic; System.Threading.Tasks; System.Diagnostics; System.Threading; System.Collections.Concurrent; namespace ConsoleApplication7 { class Program { public static BlockingCollection<string> blockingCol = new BlockingCollection<string>(5); public static string[] Alphabet = new string[5] { "a", "b", "c", "d", "e" }; static void Main(string[] args) { ThreadPool.QueueUserWorkItem(new WaitCallback(ReadItems)); Console.WriteLine("Created thread to read items"); //Creating thread to read items note how we are already enumurating collection! ThreadPool.QueueUserWorkItem(new WaitCallback(AddItems)); Console.WriteLine("Created thread that will add items"); //Stop app closing Console.ReadKey(); } public static void AddItems(object StateInfo) { int i = 0; while (i < 200) { blockingCol.Add(i++.ToString()); Thread.Sleep(10); } } PARALLELIZATION AND THREADING ENHANCEMENTS
public static void ReadItems(object StateInfo) { //Warning this will run forever unless blockingCol.CompleteAdding() is called foreach (object o in blockingCol.GetConsumingEnumerable()) { Console.WriteLine("Read item: " + o.ToString()); } } } } Synchronization Primitives
.NET 4.0 introduces a number of synchronization classes (discussed in the following sections). Barrier
The Barrier class allows you to synchronize threads at a specific point. The MSDN documentation has a good analogy: the barrier class works a bit like a few friends driving from different cities and agreeing to meet up at a gas station (the barrier) before continuing their journey. The following example creates two threads: one thread will take twice as long as the other to complete its work. When both threads have completed their work, execution will continue after the call to SignalAndWait()() has been made by both threads. using System.Threading; class Program { static Barrier MyBarrier; static void Main(string[] args) { //There will be two participants in this barrier MyBarrier = new Barrier(2); Thread shortTask = new Thread(new ThreadStart(DoSomethingShort)); shortTask.Start(); Thread longTask = new Thread(new ThreadStart(DoSomethingLong)); longTask.Start(); Console.ReadKey(); } static void DoSomethingShort() { Console.WriteLine("Doing a short task for 5 seconds"); Thread.Sleep(5000); Console.WriteLine("Completed short task");
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