1. Fundamentals Of Computer Programming with CSharp - Nakov eBook v2013
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Visual C Sharp Ebook

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We discuss these in detail in Part 5 ; right now, we'll look briefly at how you can use the Task class as a simple means of running a delegate on a pooled thread. Pooled threads are always background threads this is usually not a problem. Blocking a pooled thread may trigger additional latency in the early life of an application unless you call ThreadPool. You are free to change the priority of a pooled thread — it will be restored to normal when released back to the pool. The Task classes were introduced in Framework 4. The newer constructs are faster, more convenient, and more flexible than the old. To use the nongeneric Task class, call Task. WriteLine "Hello from the thread pool! StartNew returns a Task object, which you can then use to monitor the task — for instance, you can wait for it to complete by calling its Wait method. Any unhandled exceptions are conveniently rethrown onto the host thread when you call a task's Wait method. It lets you get a return value back from the task after it finishes executing. Any unhandled exceptions are automatically rethrown when you query the task's Result property, wrapped in an AggregateException. The Task Parallel Library has many more features, and is particularly well suited to leveraging multicore processors. NET Framework prior to 4.

The chapter finishes with a look at programming in general and the C language in particular Simple Data Processing — create a genuinely useful program.

Fundamentals Of Computer Programming with CSharp - Nakov eBook v2013

Start by creating a very simple solution and investigate the C statements that perform basic data processing. This is a book on programming, not a book on C.

The book is distributed freely. C Programming By Wikibooks.

16 Free eBooks for C# Learner

It covers the language basics, classes, advanced concepts, the. NET framework, and keywords. Reviews, Ratings, and Recommendations: site Related Book Categories: C Programming Language Microsoft. All Categories.

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Computer Science. Electronic Engineering. SetMaxThreads; the defaults are: in Framework 4. The reason there are that many is to ensure progress should some threads be blocked idling while awaiting some condition, such as a response from a remote computer.

You can also set a lower limit by calling ThreadPool. Raising the minimum thread count improves concurrency when there are blocked threads see sidebar. The default lower limit is one thread per processor core — the minimum that allows full CPU utilization. On server environments, though such ASP. Rather, it instructs the pool manager to create up to x threads the instant they are required.

To illustrate, consider a quad-core computer running a client application that enqueues 40 tasks at once.

If each task performs a 10 ms calculation, the whole thing will be over in ms, assuming the work is divided among the four cores.

And this is exactly how the thread pool works. Matching the thread count to the core count allows a program to retain a small memory footprint without hurting performance — as long as the threads are efficiently used which in this case they are.

But now suppose that instead of working for 10 ms, each task queries the Internet, waiting half a second for a response while the local CPU is idle. Fortunately, the pool manager has a backup plan. If its queue remains stationary for more than half a second, it responds by creating more threads — one every half-second — up to the capacity of the thread pool.

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The half-second delay is a two-edged sword. On the other hand, it can needlessly delay things when a pooled thread blocks, such as when querying a database or calling WebClient. For this reason, you can tell the pool manager not to delay in the allocation of the first x threads, by calling SetMinThreads, for instance: ThreadPool.