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The two background worker samples shown so far run at full throttle. In other words, the computations run on the background threads as active loops, and their reactive behavior is limited to flags that check for cancellation. In reality, background threads often have to do different kinds of work, either by responding to completed asynchronous I/O requests, by processing messages, by sleeping, or by waiting to acquire shared resources. Fortunately, F# comes with a powerful set of techniques for structuring asynchronous programs in a natural way. These are called asynchronous workflows. The next three sections cover how to use asynchronous workflows to structure asynchronous and messageprocessing tasks in ways that preserve the essential logical structure of your code.

This line allows references to directories called cgi-bin to point to the CGI-Executables directory. The default permissions on this directory allow only the everyone group to execute the contents of the directory. By using ls al on this directory, you can see the appropriate permissions for files Apple already has there.

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One of the most intuitive asynchronous tasks is fetching a web page; we all use web browsers that can fetch multiple pages simultaneously. The samples in 2 showed how to fetch pages synchronously. This is useful for many purposes, but browsers and high-performance web crawlers have tens or thousands of connections in flight at once. The type Microsoft.FSharp.Control.Async<'T> lies at the heart of F# asynchronous workflows. A value of type Async<'T> represents a program fragment that will generate a value of type 'T at some point in the future. Listing 13-5 shows how to use asynchronous workflows to fetch several web pages simultaneously. (This example uses a method AsyncReadToEnd defined in the open source library called the F# Power Pack. If you like, you can replace this with a call to the synchronous method ReadToEnd, defined in the standard .NET libraries. Doing so may increase the thread count used by executing this code.)

Higher education institutions have begun offering apps aimed at students, including maps, enrollment information, and access to the campus learning management system. Both Blackboard and Moodle developers have recognized that students may want to access coursework with a mobile phone. In Moodle s case, they ve worked on optimizing the mobile browser experience for general usability on all mobile platforms without a dedicated app. Blackboard is partnering with Sprint to offer the option of a free native app for Sprint customers. Schools that wish to support other phone networks pay an additional licensing fee. Currently, most Android apps aimed at students focus on eBooks, flash cards, grammar, and study guides. There are some true gems among these apps. Google Sky Map (Figure 16 8) shows a view of the stars that changes as you change the angle you hold your phone (as if your phone has become a virtual telescope). Likewise, Google Earth provides a virtual globe with layers of customizable information about the planet.

The immense popularity of Apache is due in part to the large number of modules that have been developed for it. However, when used improperly, these modules can represent a security risk. To reduce the risk associated with running a web server, all modules not required should be disabled by placing a # at the beginning of the LoadModule line in httpd.conf. To learn which modules are required, look to the manual pages at apache.org to get a better idea of what they are, or simply disable them one by one to see which modules

Listing 13-5. Fetching Three Web Pages Simultaneously #r "FSharp.PowerPack.dll" // contains the definition for AsyncReadToEnd open System.Net open System.IO let museums = ["MOMA", "http://moma.org/"; "British Museum", "http://www.thebritishmuseum.ac.uk/"; "Prado", "http://museoprado.mcu.es"] let fetchAsync(nm,url:string) = async { printfn "Creating request for %s..." nm let req = WebRequest.Create(url) let! resp = req.AsyncGetResponse()

will break the site if disabled. All the lines in httpd.conf that begin with LoadModule (and do not have a # in front of the line) will load a module. One example of a module that can be easily disabled without impacting the performance of the web server is bonjour_module, a module used to allow your web server to be discovered through Bonjour. Because most users will be visiting your site using a domain name, it is not important for the server to work with Bonjour. To disable bonjour_module, place # at the beginning of the line so that it reads as follows:

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