Add a function comparing tasks (bug 14403)

src/task-manager.c

@@ -693,3 +693,8 @@ set_priority_to_pid (guint pid, gint priority)
 	return (res == 0) ? TRUE : FALSE;
 }
 
+gint
+task_pid_compare_fn(gconstpointer a, gconstpointer b)
+{
+	return (((Task*)a)->pid - ((Task*)b)->pid);
+}

src/task-manager.h

@@ -95,6 +95,7 @@ enum
 void		get_owner_uid		(guint *owner_uid, gchar **owner_uid_name);
 gchar *		get_hostname		(void);
 gboolean	send_signal_to_pid	(guint pid, gint xtm_signal);
+gint		task_pid_compare_fn	(gconstpointer a, gconstpointer b);
 gboolean	set_priority_to_pid	(guint pid, gint priority);