Pro .NET 4 Parallel Programming in C# by Adam Freeman

By Adam Freeman

Parallel programming has been revolutionised in .NET four, offering, for the 1st time, a standardised and simplified approach 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 take advantage of and extra robust than "classic" .NET threads, parallel programming permits the developer to stay interested by the paintings an program must practice.

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You can use this as an alternative to the method shown in Listing 2-7 for checking cancellation, which can be useful if your task relies on other asynchronous operations, such as I/O reads. You can also use the delegate feature to be notified when a cancellation happens; this can be useful in UI applications. Listing 2-8 shows how the delegate feature can be used. Listing 2-8. Start(); // read a line from the console. WriteLine("Main method complete. ReadLine(); } } } Listing 2-8 is very similar to Listing 2-7, with the addition of the cancellation delegate registered using the Register() method of the CancellationToken class, which is shown in the bold code in the listing.

Table 2-6 shows the overloaded versions. Table 2-6. Wait() Instance Method Method Description Wait() Wait until the Task completes, is cancelled, or throws an exception. Wait(CancellationToken) Wait until the CancellationToken is cancelled or the Task completes, is cancelled, or throws an exception. Wait(Int32) Wait for the specified number of milliseconds to pass or for the Task to complete, be cancelled, or throw an exception (whichever happens first). Wait(TimeSpan) Wait until the specified TimeSpan has passed or for the Task to complete, be cancelled, or throw an exception (whichever happens first).

If you must avoid a full wait, use spin waiting in preference to code loops. Example In the following example, one Task enters a code loop to await the cancellation of another Task. Another Task does the same thing but uses spin waiting. On the quad-core machine that I used to write this book, this example burns roughly 30 percent of the available CPU, which is quite something for a program that does nothing at all. You may get different results if you have fewer cores.

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