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subsume the need to resort to shared-memory concurrency. However, a working knowledge of thread primitives and shared-memory concurrency is still very useful, especially if you want to implement your own basic constructs or highly efficient concurrent algorithms on shared-memory hardware.

Because oftentimes you place initialization or cross-page posting code in a page event (typically for the Load event), you need to make sure that this code is executed only for initialization or when data is being posted to the page You can do so by checking the IsPostBack property of the Page object, which returns false if the page is requested the first time..

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Perhaps the most challenging aspect of using MySQL for experimentation is modifying the parser to recognize the new keyword for the SQL commands (see 8). Although not precisely a complex or new implementation language, modification of the YACC files requires careful attention to the original developers intent. The solution involves placing copies of the SQL syntax definitions for the new commands at the top of each of the parser command definitions. This permits you to intercept the flow of the parser in order to redirect the query execution. The most frequent and least trivial challenge of all is keeping up with the constant changes to the MySQL code base. Unfortunately, the frequency of upgrades is unpredictable. If you want to keep up to date with feature changes, the integration of the experimental technologies requires reinserting the modifications to the MySQL source files with each release of the source code. This is probably not a concern for anyone wanting to experiment with MySQL. If you find yourself wanting to keep up with the changes due to extensions you are writing, you should probably consider building a second server for experimentation and do your development on the original server.

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!

type SchemaReader<'schema> = new : unit -> SchemaReader<'schema> member ReadFile : string -> seq<'schema> member ReadLine : System.IO.TextReader -> 'schema First we show how the SchemaReader is used in practice. Let s say you have a text file containing lines such as this: Steve, 12 March 2007, Cheddar Sally, 18 Feb 2007, Brie ... Now it s reasonable to want to convert this data to a typed data representation. You can do this simply by defining an appropriate record type along with enough information to indicate how the data in the file maps into this type. This information is expressed using custom attributes, which are a way to add extra meta-information to assembly, type, member, property, and parameter definitions. Each custom attribute is specified as an instance of a typed object, here ColumnAttribute, defined in Listing 9-10. The suffix Attribute can be dropped when using the custom attribute. type CheeseClub = { [<Column(0)>] Name : string [<Column(2)>] FavouriteCheese : string [<Column(1)>] LastAttendance : System.DateTime } You can now instantiate the SchemaReader type and use it to read the data from the file into this typed format: > let reader = new SchemaReader<CheeseClub>();; val reader : SchemaReader<CheeseClub> > fsi.AddPrinter(fun (c:System.DateTime) -> c.ToString());; val it : unit = () > System.IO.File.WriteAllLines("data.txt", [| "Steve, 12/03/2007, Cheddar"; "Sally, 18/02/2007, Brie"; |]);; val it : unit = () > reader.ReadFile("data.txt");; val it : seq<CheeseClub> = seq [{Name = "Steve"; FavouriteCheese = "Cheddar"; LastAttendance = 12/03/2007 00:00:00;}; {Name = "Sally"; FavouriteCheese = "Brie"; LastAttendance = 18/02/2007 00:00:00;}]

Tip The challenge that you are most likely to encounter is examining the MySQL code base and discovering the

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

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