By Adam Freeman
Parallel programming has been revolutionised in .NET four, delivering, for the 1st time, a standardised and simplified technique for developing strong, scalable and trustworthy multi-threaded functions. The Parallel programming beneficial properties of .NET four let the programmer to create purposes that harness the facility of multi-core and multi-processor machines. easier to exploit and extra strong than "classic" .NET threads, parallel programming permits the developer to stay involved in the paintings an program must practice.
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Extra resources for Pro .NET 4 Parallel Programming in C#
SpinWait() method is the number of times that the tight CPU loop should be performed, and the amount of time that this takes depends on the speed of your system. Spin waiting is most commonly used to acquire synchronization locks, which are described in the next chapter. The problem with spin waiting is that your task doesn’t stop using the CPU; it just burns a specified number of CPU cycles. This approach distorts the behavior of the scheduling process, and you can get some quite odd behaviors from an application if you use spin locks wrongly.
Listing 2-5. WriteLine("Main method complete. ReadLine(); } } } Reading the Result property waits until the Task it has been called on has completed. In Listing 2-5, this means that the second Task will not be started until the first has completed, because we call the Result property on the first Task before creating and starting the second Task. StartNew() method. Factory also includes the StartNew
Check the isCancellationRequested property of CancellationToken each time your task body loop iterates. If this property returns true, release any resources you have been using and throw an instance of OperationCanceledException. 2-7 Poll for task cancellation. ThrowIfCancellationRequested() method to check for cancellation, and throw an instance of OperationCanceledException in a single code statement. info CHAPTER 2 ■ TASK PROGRAMMING Problem Solution Listing Use a delegate for task cancellation.