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CHAPTER 6 USING GLIB
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Destroy functions defined in g_timeout_add_full() should not return any value, but do receive a gpointer as their parameter. This gpointer is the same value originally received by the timeout function, which gives you an opportunity to free it from memory if necessary.
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Idle Functions
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As mentioned in 1, GLib provides a special type of function called an idle function that will be called when there are no events pending with a higher priority. They run over and over when there is nothing else to do in the main loop. Idle functions are added with g_idle_add() or g_idle_add_full(). The only difference between these two functions is that the latter allows you to specify a destroy function and a priority instead of using the default of G_PRIORITY_DEFAULT_IDLE. The first parameter of this function is the priority of the idle function. The idle function is only called when there are no events pending with a higher priority. Therefore, the higher the priority, the more often the function will be called. In almost all cases, idle functions should have a priority of G_PRIORITY_HIGH_IDLE or G_PRIORITY_DEFAULT_IDLE. guint g_idle_add_full (gint priority, GSourceFunc idle_function, gpointer data, GDestroyNotify destroy_function); The second parameter in g_idle_add_full() is the actual idle function. Similar to timeouts, idle functions receive a gpointer and return a gboolean value. By returning FALSE from the idle function, it will be removed. The gpointer parameter is defined by the third parameter of g_idle_add_full(). The last parameter defines a destroy function that will be called when the idle function is removed, which occurs when FALSE is returned from the idle function. It is safe to set this parameter as NULL. Destroy functions defined in g_idle_add_full() should not return any value, but do receive a gpointer as their parameter. This gpointer is the same value originally received by the idle function, which gives you an opportunity to free it from memory. While you can remove an idle function be returning FALSE from the callback, you can also remove it from any place in your application with g_idle_remove_data(). This function accepts the data that was used for the idle function s callback and will return TRUE if it was successfully removed. gboolean g_idle_remove_by_data (gpointer data);
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Caution You should never call g_idle_remove_by_data() on an idle function within its callback. This can cause corruption in the idle function list. Instead, return FALSE to remove the idle function within the callback.
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CHAPTER 6 USING GLIB
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Data Types
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One of the most useful features provided by GLib is the vast collection of data types. This chapter will introduce you to the most important data types, many of which are used in concurrence with GTK+ widgets. You should pay special attention to singly and doubly linked lists, since these are widely used throughout GTK+. You will notice as you go through the rest of this section that each of the data types presented is used in a similar way. This uniform API reduces the number of design patterns you need to learn. In doing this, many of the types were endowed with similar functions. However, each of these types has specific advantages and disadvantages that you should pay close attention to when deciding what type to use.
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Strings
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Strings are nothing new to most programmers, but the GString structure can be very useful to the C programmer. It provides an easy way to create strings that automatically grow in size when text is added. This helps you avoid problems such as buffer overflows and other runtime errors that plague standard C strings. GLib strings also provide some memory management, easy access to the current state of the C string, and useful functions for manipulating the string. This makes dealing with C strings a lot easier for the programmer than doing so without GString. The GString structure consists of three members: the C string that holds the current state of the string, the length of str excluding the terminating byte, and the amount of memory currently allocated for the string. If the string needs to grow beyond this allocated length, GString will automatically allocate more memory. typedef struct { gchar *str; gsize len; gsize allocated_len; } GString;
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