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CLR AND BCL CHANGES
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Interface Contracts
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Because interfaces cannot have method bodies, contracts must be declared in a slightly different way: [ContractClass(typeof(ContractForInteface))] interface IDoSomething { int DoSomething(int value); } [ContractClassFor(typeof(IDoSomething))] sealed class ContractForInteface : IDoSomething { int IDoSomething.DoSomething(int value) { Contract.Requires( value != 0); //contracts require a dummy value return default(int); }
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Developers interested in the code contracts features might also be interested in the PEX research project. PEX aims to automate testing by analyzing code. For more information, please refer to http://research.microsoft.com/en-us/projects/Pex/.
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The changes to the CLR in this release have three main aims: Improve performance Offer better compatibility/control for applications built in previous versions of the .NET Framework Introduce functionality necessary for enhancements such as Dynamic Language Runtime (DLR) and parallelization (refer to 3)
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The great news is that many of the low-level changes will make your applications run more quickly with no input required from you! A simplified security model is welcome, and it is good to see the addition of 64-bit support and APIs for working with some of the new Windows 7 features. A number of welcome tweaks have also been made to the BCL and NCL. Finally, you looked briefly at code contracts: a great method inspired outside of .NET to write safer and more reliable code. Great job, CLR and BCL team!
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http://blogs.msdn.com/bclteam/ http://blogs.msdn.com/ncl/archive/2009/07/20/new-ncl-features-in-net-4-0beta-2.aspx http://www.danielmoth.com/Blog/2008/11/new-and-improved-clr-4-thread-pool.html http://blogs.msdn.com/ericeil/archive/2009/04/23/clr-4-0-threadpoolimprovements-part-1.aspx http://blogs.msdn.com/ukadc/archive/2009/10/13/background-and-foreground-gcin-net-4.aspx http://blogs.msdn.com/shawnfa/ http://msdn.microsoft.com/en-us/library/dd233103(VS.100).aspx http://download.microsoft.com/download/C/2/7/C2715F76-F56C-4D37-9231EF8076B7EC13/userdoc.pdf http://msdn.microsoft.com/en-us/magazine/ee677170.aspx
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Parallelization and Threading Enhancements
Availability: Framework 4 Some Functionality in 3.5 with Parallel Extensions CTP
Until recently, CPU manufactures regularly released faster and faster processors. Speed increases, however, have all but ground to a halt due to various issues such as signal noise, power consumption, heat dissipation, and non-CPU bottlenecks. No doubt these issues will be resolved in the future, but in the meantime manufacturers are instead concentrating on producing processors with multiple cores. Multicore processers can process sections of code in parallel, resulting in some calculations being performed quicker and thus increasing application performance. To take full advantage of multicore machines, however, code has to be designed to be run in parallel. A number of years ago, Microsoft foresaw the importance that multicore processors would come to play and started developing the parallel extensions. In .NET 4.0, Microsoft built on this earlier work and integrated it into the core framework, enabling developers to parallelize their code in an easy and consistent way. Because this is the first mainstream release, it s probably wise to expect to see some minor tweaks and API changes in the future. Although the parallelization enhancements make writing code to run in parallel much easier, don t underestimate the increasing complexity that parallelizing an application can bring. Parallelization shares many of the same issues you might have experienced when creating multithreaded applications. You must take care when developing parallel applications to isolate code that can be parallelized.
Parallelization Overview
Some of the parallelization enhancements might look familiar to a few readers because they were released previously as part of the parallel extensions. .NET 4.0 builds on this work but brings the extensions into the core CLR within mscorlib.dll. The Microsoft parallel extensions and enhancements can be divided into five main areas: Task Parallel Library (TPL)) and Concurrency and Coordination Runtime (CCR) Parallel LINQ (PLINQ) New debugging and profiling tools
PARALLELIZATION AND THREADING ENHANCEMENTS
Coordination data structures Parallel Pattern Library(PPL) ) C++ only; not covered
Important Concepts
Parallelism and threading are confusing and there are a few questions many developers have (see the following questions).
Why Do I Need These Enhancements
Can t you just create lots of separate threads Well, you can, but there are a couple of issues with this approach. First, creating a thread is a resource-intensive process, so (depending on the type of work you do) it might be not be the most efficient and quickest way to complete a task. Creating too many threads, for example, can slow task completion because each thread is never given time to complete as the operating system rapidly switches between them. And what happens if someone loads up two instances of your application To avoid these issues, .NET implements a thread pool that has a bunch of threads up and running, ready to do your bidding. The thread pool also can impose a limit on the number of threads created preventing thread starvation issues. However the thread pool isn t so great at letting you know when work has been completed or cancelling running threads. The thread pool also doesn t have any information about the context in which the work is created, which means it can t schedule it as efficiently as it could have done. Enter the new parallelization functionality that provides additional cancellation and scheduling, and offers an intuitive way of programming. Note that the parallelization functionality works on top of .NET s thread pool instead of replacing it. See 4 for details about improvements made to the thread pool in this release.
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