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CHAPTER 6 USING GLIB
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int g_remove (const gchar *filename); int g_rmdir (const gchar *filename); You can use g_mkdir() to create a new directory. You should specify permissions in a fourdigit integer. For example, acceptable permissions would be 0755, 0700, and so on. int g_mkdir (const gchar *filename, int permissions); When using many of these file utility functions, you can use relative paths as well as absolute paths. However, to use relative paths, you will need to ensure that you are in the correct directory. You can use g_chdir() to move throughout the directory structure of your hard drive. This function will accept relative and absolute paths as well. int g_chdir (const gchar *path); You may need to change the permissions of a file or a folder from within your application. This can be done with g_chmod(). Permissions integers should be specified with four digits, as they were to g_mkdir(). int g_chmod (const gchar *filename, int permissions);
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The Main Loop
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In past chapters, we have used GTK+ s main loop without any thought of the fact that GLib has its own main loop. It could be ignored in all other examples, because gtk_init() will automatically create a GLib main loop for you. In fact, most of the main loop functionality is actually implemented in GLib; GTK+ simply provides widget signals to the system. The GTK+ main loop also connects GDK s X server events to the GLib system. The purpose of the main loop is to sleep until some event has occurred. At that point, a callback function will be invoked, if available. GLib s main loop is implemented in Linux using the poll() system call. Events and signals are associated with file descriptors, which are watched using poll(). The advantage of using poll() is that GLib does not need to continuously check for new events. Rather, it can sleep until some signal or event is emitted. By doing this, your application will take up almost no processor time until it is needed. The GTK+ main loop is invoked with gtk_main(). This function can actually be called multiple times; the call on the top of the stack is removed when you call gtk_main_quit(). You can retrieve the current main loop stack level with gtk_main_level().
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Contexts and Sources
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The GLib main loop is implemented as a number of structures, which allow multiple instances to be run concurrently. GMainContext is used to represent a number of event sources. Each thread has its own context, which can be retrieved with g_main_context_get(). You can also retrieve the default context with g_main_context_get_default().
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CHAPTER 6 USING GLIB
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Each event source in the context is given a priority, defaulting to G_PRIORITY_DEFAULT or zero. Sources with a higher priority will be given precedence over those with a negative priority. Examples of event sources are timeouts and idle functions. GLib also provides GMainLoop, which represents one instance of the main loop. A new main loop can be created with g_main_loop_new(), where a NULL context will use the default. Setting is_running to TRUE states that the main loop is running, although this will automatically be set when you call g_main_loop_run(). GMainLoop* g_main_loop_new (GMainContext *context, gboolean is_running);
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Tip The gtk_dialog_run() function blocks the main loop from continuing by creating its own GLib main
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loop with g_main_loop_new(). It will continue to run until g_main_loop_quit() is called on the loop.
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The GTK+ main loop implements the GLib main loop by creating a GMainLoop with the default context in gtk_main(). In short, the main loop functionality provided by functions in GTK+ is implemented in GLib. GLib supports the ability to create new event sources. Deriving from GSource creates new sources. GLib provides the ability to create new timeout and idle function sources with g_timeout_source_new() and g_idle_source_new(). These can be associated with your contexts. It is also possible to create a custom source with g_source_new(). This function accepts a table of functions and the structure size of the new source. These functions are used to define the behavior of the new source type. GSource* g_source_new (GSourceFuncs *source_funcs, guint struct_size); You should then associate the source with a GMainContext by calling g_source_attach(). This will return a unique integer identifier of the source within the context. For the scope of this book, you have learned enough about the main loop to understand the examples in the rest of this section. There is much more to the complexities of the main loop that will not be covered in this book. Therefore, if you have a need to create your own sources and contexts, you should reference the GLib API documentation.
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