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This chapter has avoided showing how to work with threads directly, instead relying on abstractions such as BackgroundWorker and the .NET thread pool. If you want to create threads directly, here is a short sample: open System.Threading let t = new Thread(ThreadStart(fun _ -> printfn "Thread %d: Hello" Thread.CurrentThread.ManagedThreadId)); t.Start(); printfn "Thread %d: Waiting!" Thread.CurrentThread.ManagedThreadId t.Join(); printfn "Done!" When run, this gives the following: val t : Thread Thread 1: Waiting! Thread 10: Hello Done!

When you add widgets to the Home screen, most widgets are already a predetermined size and shape. Either they fit in the space given or they do not. If you long-click a widget, you can move it within a screen, but you cannot make it larger or smaller. If you have a choice of widgets, you ll find that many app developers label the widgets with things like 3 2 or 4 1. What does that mean If you measure your phone s screen not by the physical screen size, but by the number of apps you can store on it, most phones have a Home screen that measures four app icons by four app icons. The widget measurement generally goes horizontally by vertically, so a widget that measures 4 1, such as the Power Control widget (shown at the top of the screen in Figure 17 1), takes up the space of four apps across and one down. This allows you better Home screen space management.

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Let s explore what this code means, starting with the first line: AuthUserFile /home/pathto/.htpasswd allows the browser to find the right path to your .htpasswd file. The rest of the command after AuthUserFile specifies the path leading to the actual file name. AuthType Basic defines the type of encryption to be used. There are multiple methods of encryption, but Basic is the most commonly used. However, it shouldn t be used for any systems that host high-traffic or high-security environments. AuthName "My Secret Place" defines how your protected directory is referred to in the pop-up message box when the visitor hits the protected area. This name is yours to choose. The users see only what is inside the quotes. This last part of the script tells the browser to check credentials that the visitor enters into the box against the information in your .htpasswd file:

Caution Always avoid using Thread.Suspend, Thread. Resume, and Thread.Abort. These are guaranteed

ways to put obscure concurrency bugs in your program. The MSDN website has a good description of why Thread.Abort may not even succeed. One of the only compelling uses for Thread.Abort is to implement Ctrl+C in an interactive development environment for a general-purpose language such as F# Interactive.

When visitors try to access a page within a protected directory, they will get a dialog box asking for a username and password. If they enter bad information, they will be directed to an error page. If you would rather password-protect a specific file than a folder, you can use this file name in your .htaccess file, where the AuthUserFile variable defines the specific file or web page for which you want to control access:

Many multithreaded applications use mutable data structures shared between multiple threads. Without synchronization, these data structures will almost certainly become corrupt: threads may read data that has been only partially updated (because not all mutations are atomic), or two threads may write to the same data simultaneously (a race condition). Mutable data structures are usually protected by locks, although lock-free mutable data structures are also possible. Shared-memory concurrency is a difficult and complicated topic, and a considerable amount of good material on .NET shared-memory concurrency is available on the Web. All this material applies to F# when you re programming with mutable data structures such as reference cells, arrays, and hash tables and the data structures can be accessed from multiple threads simultaneously. F# mutable data structures map to .NET memory in fairly predictable ways; for example, mutable references become mutable fields in a .NET class, and mutable fields of word size can be assigned atomically.

<files "filename.cgi"> AuthUserFile /home/pathto/.htpasswd AuthType Basic AuthName "Secret Place" require valid-user </files>

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