barcode printing using c#.net Exploring the C# Library in Visual C#

Drawer QR in Visual C# Exploring the C# Library

Exploring the C# Library
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NOTE Although the use of the TPL and PLINQ is now recommended for most multithreading
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applications, threading based on the Thread class as described in 23 is still in widespread use Furthermore, much of what is described in 23 applies to the TPL Therefore, an understanding of the material in 23 is still required to fully master multithreading in C#
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Two Approaches to Parallel Programming
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When using the TPL, there are two basic ways in which you can add parallelism to a program The first is called data parallelism With this approach, one operation on a collection of data is broken into two or more concurrent threads of execution, each operating on a portion of the data For example, if a transformation is applied to each element in an array, then through the use of data parallelism, it is possible for two or more threads to be operating on different ranges of the array concurrently As you can imagine, such parallel actions could result in substantial increases in speed over a strictly sequential approach Although data parallelism has always been possible by using the Thread class, it was difficult and time-consuming to construct scalable solutions The TPL changes this With the TPL, scalable data parallelism is easy to add to your program The second way to add parallelism is through the use of task parallelism This approach executes two or more operations concurrently Thus, task parallelism is the type of parallelism that has been accomplished in the past via the Thread class The advantages that the TPL adds are ease-of-use and the ability to automatically scale execution to multiple processors
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The Task Class
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At the core of the TPL is the Task class With the TPL, the basic unit of execution is encapsulated by Task, not Thread Task differs from Thread in that Task is an abstraction that represents an asynchronous operation Thread encapsulates a thread of execution Of course, at the system level, a thread is still the basic unit of execution that can be scheduled by the operating system However, the correspondence between a Task instance and a thread of execution is not necessarily one-to-one Furthermore, task execution is managed by a task scheduler, which works with a thread pool This means that several tasks might share the same thread, for example The Task class (and all of the TPL) is defined in SystemThreadingTasks
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Creating a Task
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There are various ways to create a new Task and start its execution We will begin by first creating a Task using a constructor and then starting it by calling the Start( ) method Task defines several constructors Here is the one we will be using: public Task(Action action) Here, action is the entry point of the code that represents the task Action is a delegate defined in System It has several forms Here is the form we will use now: public delegate void Action( ) Thus, the entry point must be a method that takes no parameters and returns void (As you will see later, it is possible to specify an argument to Action)
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24:
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M u l t i t h r e a d i n g , P a r t Tw o : E x p l o r i n g t h e Ta s k P a r a l l e l L i b r a r y a n d P L I N Q
Once a task has been created, you can start it by calling Start( ) One version is shown here: public void Start( ) After a call to Start( ), the task scheduler schedules it for execution The following program puts the preceding discussion into action It creates a separate task based on the MyTask( ) method After Main( ) starts, the task is created and then started Both MyTask( ) and Main( ) execute concurrently
// Create and run a task using System; using SystemThreading; using SystemThreadingTasks; class DemoTask { // A method to be run as a task static void MyTask() { ConsoleWriteLine("MyTask() starting"); for(int count = 0; count < 10; count++) { ThreadSleep(500); ConsoleWriteLine("In MyTask(), count is " + count); } ConsoleWriteLine("MyTask terminating"); } static void Main() { ConsoleWriteLine("Main thread starting"); // Construct a task Task tsk = new Task(MyTask); // Run the task tskStart(); // Keep Main() alive until MyTask() finishes for(int i = 0; i < 60; i++) { ConsoleWrite(""); ThreadSleep(100); } ConsoleWriteLine("Main thread ending"); } }
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