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An obvious producer-consumer example is probably one you know about, but never realized was a producer-consumer implementation. In Windows Forms, multithreaded applications aren t allowed to access user interface components if they aren t the thread that created the UI element. To get around this problem, the Windows Forms library created the Invoke method, which is illustrated as follows (note the GUI application uses another thread to periodically increment a counter that is displayed in a textbox): public partial class Form1: Form { public Form1() { InitializeComponent(); } private int _counter; private void IncrementCounter() { txtMessage.Text = "Counter (" + _counter + ")"; _counter++; } delegate void DelegateIncrementCounter();

GLib provides a few other utility functions that wrap the functionality of UNIX operating systems. You need to include <glib/gstdio.h> for any of these functions to work. Many of the most important functions are shown in this section. For a full list, you should reference the File Utilities section of the GLib API documentation. For all of the functions in this section, 0 is returned if the action was successful or -1 if it was unsuccessful.

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Note All of the functions covered in this section were introduced in GLib 2.6, so if you are using an older

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private void PeriodicIncrement() { while(1 == 1) { Invoke(new DelegateIncrementCounter(IncrementCounter)); Thread.Sleep(1000); } } Thread _thread; private void Form1_Load(object sender, EventArgs e) { _thread = new Thread(new ThreadStart(PeriodicIncrement)); _thread.Start(); } } When Form1 is loaded, the method Form1_Load is executed, which instantiates a new thread that then executes the method PeriodicIncrement. Within the implementation of PeriodicIncrement is a never-ending loop that calls the Form.Invoke method. Passed to the Form.Invoke method is a delegate. The delegate is the method IncrementCounter, which increments a counter and outputs the result to the textbox txtMessage. From a user perspective, it would seem obvious to call the method IncrementCounter directly from the other thread (_thread). However, hidden in the implementation of Invoke is a producer-consumer implementation. The producer is the Invoke method that adds to a queue a delegate that needs to be called. The consumer is the Windows.Forms.Form class, which periodically checks its Invoke queue and executes the delegates contained within. In a nutshell, a producer-consumer is nothing more than a handoff of information from one thread to another thread. The reason why this is effective is that the producer and consumer are separate and manage their own concerns. The only common information between the producer and consumer is a queue or list that is synchronized and contains information both are interested in.

Use g_rename() to move a file or a folder to a new location. If the old and new filenames are both the same string, 0 will be returned with no further action. If a file already exists in the location of the new filename, the file will be replaced on UNIX machines. Filenames for directories and files cannot be mixed. int g_rename (const gchar *old_filename, const gchar *new_filename); There are a few permissions issues surrounding g_rename() as well. The user owns the file and the directory containing the file. The user must also be able to write to the file. Removing a file or directory is as easy as calling g_remove() or g_rmdir(). It is actually possible to remove a directory with g_remove(), because it will make a call to the directory removal function. However, for the sake or portability to other operating systems, you should always use g_rmdir() to remove directories. Both of these functions will fail if the directory is not empty.

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