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One of the easiest ways to get going with concurrency and parallelism is to use the System.ComponentModel.BackgroundWorker class of the .NET Framework. A BackgroundWorker class runs on its own dedicated operating system thread. These objects can be used in many situations but are especially useful for coarse-grained concurrency and parallelism such as checking the spelling of a document in the background. This section shows some simple uses of BackgroundWorker and how to build similar objects that use BackgroundWorker internally. Listing 13-1 shows a simple use of BackgroundWorker that computes the Fibonacci numbers on the worker thread. Listing 13-1. A Simple BackgroundWorker open System.ComponentModel open System.Windows.Forms let worker = new BackgroundWorker() let numIterations = 1000 worker.DoWork.Add(fun args -> let rec computeFibonacci resPrevPrev resPrev i = // Compute the next result let res = resPrevPrev + resPrev // At the end of the computation write the result into mutable state if i = numIterations then args.Result <- box res else // Compute the next result computeFibonacci resPrev res (i+1) computeFibonacci 1 1 2) worker.RunWorkerCompleted.Add(fun args -> MessageBox.Show(sprintf "Result = %A" args.Result) |> ignore) // Execute the worker worker.RunWorkerAsync() Table 13-1 shows the primary members of a BackgroundWorker object. The execution sequence of the code in Listing 13-1 is as follows: 1. 2. The main application thread creates and configures a BackgroundWorker object. After configuration is complete, the main application thread calls the RunWorkerAsync method on the BackgroundWorker object. This causes the DoWork event to be raised on the worker thread. The DoWork event handler is executed in the worker thread and computes the one-thousandth Fibonacci number. At the end of the computation, the result is written into args.Result, a mutable storage location in the event arguments for the DoWork event. The DoWork event handler then completes.

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those that return an integer Similarly, there are other classes for functions that return other types This is a departure from the dynamically loadable UDF interface and is the main reason you would choose to create a native function versus a dynamically loadable one For more information about what Item_xxx_func classes there are, see the itemh file in the /sql directory off the root of the source code tree Since the Gregorian function will return a string, you need to derive from the Item_str_func class, define the class in item_str_funch, and implement the class in item_str_funccc Open the item_str_funch file and add the class definition to the header file as shown in Listing 8-13 Notice that this class has only four functions that must be declared.

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Some clarification about the error message you are getting: https://stackoverflow. com/a/18138276. Also, next time please post your code or ...

At some point after the DoWork event handler completes, the RunWorkerCompleted event is automatically raised on the main application thread. This displays a message box with the result of the computation, retrieved from the args field of the event arguments.

The simplest way to build strings is via concatenation using the + operator: > "Couldn't put Humpty" + " " + "together again";; val it : string = "Couldn't put Humpty together again"

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The minimal functions needed are the function that contains the code for the function (Item_func_gregorian), a value function (val_str), a function that returns the name (func_name), and a function to set the maximum length of the string argument (fix_length_and_dec) You can add any others that you might need, but these four are the ones required for functions that return strings Other item base (and derived) classes may require additional functions such as val_int(), val_double(), and so on Check the definition of the class you need to derive from in order to identify the methods that must be overridden; these are known as virtual functions Listing 8-13 Modifications to the item_str_funch File class Item_func_gregorian :public Item_str_func { public: Item_func_gregorian(Item *a) :Item_str_func(a) {} String *val_str(String *str); const char *func_name() const { return "gregorian"; } void fix_length_and_dec(); }; Let s add the class implementation Open the item_strfunc.

RunWorkerAsync: unit -> unit CancelAsync: unit -> unit CancellationPending: bool WorkerReportsProgress: bool WorkerSupportsCancellation: bool ReportProgress: int -> unit DoWork: IEvent<DoWorkEventArgs> RunWorkerCompleted: IEvent<RunWorkerCompletedEventArgs> ProgressChanged: IEvent<ProgressChangedEventArgs>

You can also build strings using objects of the .NET type System.Text.StringBuilder. These objects are mutable buffers that you can use to accumulate and modify text, and they are more efficient than repeated uses of the + operator. Here s an example: > let buf = new System.Text.StringBuilder();; val buf : System.Text.StringBuilder > buf.Append("Humpty Dumpty");; > buf.Append(" sat on the wall");; > buf.ToString();; val it : string = "Humpty Dumpty sat on the wall"

cc file and add the implementation of the Gregorian class functions as shown in Listing 8-14 You need to implement the main function, val_str(), which does the work of the Julian-to-Gregorian operation You also need to implement the fix_length_and_dec() function to set the limit of the size of the string returned Listing 8-14 Modifications to the item_strfunccc File String *Item_func_gregorian::val_str(String *str) { static int DAYS_IN_MONTH[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; longlong jdate = args[0]->val_int(); int year = 0; int month = 0; int day = 0; int i; char cstr[30];.

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