1 /* GLIB - Library of useful routines for C programming
2 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
4 * gdataset.c: Generic dataset mechanism, similar to GtkObject data.
5 * Copyright (C) 1998 Tim Janik
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this library; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
23 * Modified by the GLib Team and others 1997-2000. See the AUTHORS
24 * file for a list of people on the GLib Team. See the ChangeLog
25 * files for a list of changes. These files are distributed with
26 * GLib at ftp://ftp.gtk.org/pub/gtk/.
30 * MT safe ; except for g_data*_foreach()
41 #include "gdatasetprivate.h"
44 #include "gstrfuncs.h"
45 #include "gtestutils.h"
47 #include "glib_trace.h"
52 * @short_description: associate groups of data elements with
53 * particular memory locations
55 * Datasets associate groups of data elements with particular memory
56 * locations. These are useful if you need to associate data with a
57 * structure returned from an external library. Since you cannot modify
58 * the structure, you use its location in memory as the key into a
59 * dataset, where you can associate any number of data elements with it.
61 * There are two forms of most of the dataset functions. The first form
62 * uses strings to identify the data elements associated with a
63 * location. The second form uses #GQuark identifiers, which are
64 * created with a call to g_quark_from_string() or
65 * g_quark_from_static_string(). The second form is quicker, since it
66 * does not require looking up the string in the hash table of #GQuark
69 * There is no function to create a dataset. It is automatically
70 * created as soon as you add elements to it.
72 * To add data elements to a dataset use g_dataset_id_set_data(),
73 * g_dataset_id_set_data_full(), g_dataset_set_data() and
74 * g_dataset_set_data_full().
76 * To get data elements from a dataset use g_dataset_id_get_data() and
77 * g_dataset_get_data().
79 * To iterate over all data elements in a dataset use
80 * g_dataset_foreach() (not thread-safe).
82 * To remove data elements from a dataset use
83 * g_dataset_id_remove_data() and g_dataset_remove_data().
85 * To destroy a dataset, use g_dataset_destroy().
90 * @title: Keyed Data Lists
91 * @short_description: lists of data elements which are accessible by a
92 * string or GQuark identifier
94 * Keyed data lists provide lists of arbitrary data elements which can
95 * be accessed either with a string or with a #GQuark corresponding to
98 * The #GQuark methods are quicker, since the strings have to be
99 * converted to #GQuarks anyway.
101 * Data lists are used for associating arbitrary data with #GObjects,
102 * using g_object_set_data() and related functions.
104 * To create a datalist, use g_datalist_init().
106 * To add data elements to a datalist use g_datalist_id_set_data(),
107 * g_datalist_id_set_data_full(), g_datalist_set_data() and
108 * g_datalist_set_data_full().
110 * To get data elements from a datalist use g_datalist_id_get_data()
111 * and g_datalist_get_data().
113 * To iterate over all data elements in a datalist use
114 * g_datalist_foreach() (not thread-safe).
116 * To remove data elements from a datalist use
117 * g_datalist_id_remove_data() and g_datalist_remove_data().
119 * To remove all data elements from a datalist, use g_datalist_clear().
125 * The #GData struct is an opaque data structure to represent a <link
126 * linkend="glib-Keyed-Data-Lists">Keyed Data List</link>. It should
127 * only be accessed via the following functions.
132 * @data: the data element.
134 * Specifies the type of function which is called when a data element
135 * is destroyed. It is passed the pointer to the data element and
136 * should free any memory and resources allocated for it.
139 #define G_DATALIST_FLAGS_MASK_INTERNAL 0x7
141 /* datalist pointer accesses have to be carried out atomically */
142 #define G_DATALIST_GET_POINTER(datalist) \
143 ((GData*) ((gsize) g_atomic_pointer_get (datalist) & ~(gsize) G_DATALIST_FLAGS_MASK_INTERNAL))
145 #define G_DATALIST_SET_POINTER(datalist, pointer) G_STMT_START { \
146 gpointer _oldv, _newv; \
148 _oldv = g_atomic_pointer_get (datalist); \
149 _newv = (gpointer) (((gsize) _oldv & G_DATALIST_FLAGS_MASK_INTERNAL) | (gsize) pointer); \
150 } while (!g_atomic_pointer_compare_and_exchange ((void**) datalist, _oldv, _newv)); \
153 /* --- structures --- */
157 GDestroyNotify destroy;
160 typedef struct _GDataset GDataset;
163 guint32 len; /* Number of elements */
164 guint32 alloc; /* Number of allocated elements */
165 GDataElt data[1]; /* Flexible array */
170 gconstpointer location;
175 /* --- prototypes --- */
176 static inline GDataset* g_dataset_lookup (gconstpointer dataset_location);
177 static inline void g_datalist_clear_i (GData **datalist);
178 static void g_dataset_destroy_internal (GDataset *dataset);
179 static inline gpointer g_data_set_internal (GData **datalist,
182 GDestroyNotify destroy_func,
184 static void g_data_initialize (void);
187 * Each standalone GDataList is protected by a bitlock in the datalist pointer,
188 * which protects that modification of the non-flags part of the datalist pointer
189 * and the contents of the datalist.
191 * For GDataSet we have a global lock g_dataset_global that protects
192 * the global dataset hash and cache, and additionally it protects the
193 * datalist such that we can avoid to use the bit lock in a few places
197 /* --- variables --- */
198 G_LOCK_DEFINE_STATIC (g_dataset_global);
199 static GHashTable *g_dataset_location_ht = NULL;
200 static GDataset *g_dataset_cached = NULL; /* should this be
203 /* --- functions --- */
205 #define DATALIST_LOCK_BIT 2
208 g_datalist_lock (GData **datalist)
210 g_pointer_bit_lock ((void **)datalist, DATALIST_LOCK_BIT);
214 g_datalist_unlock (GData **datalist)
216 g_pointer_bit_unlock ((void **)datalist, DATALIST_LOCK_BIT);
219 /* Called with the datalist lock held, or the dataset global
220 * lock for dataset lists
223 g_datalist_clear_i (GData **datalist)
228 data = G_DATALIST_GET_POINTER (datalist);
229 G_DATALIST_SET_POINTER (datalist, NULL);
233 G_UNLOCK (g_dataset_global);
234 for (i = 0; i < data->len; i++)
236 if (data->data[i].data && data->data[i].destroy)
237 data->data[i].destroy (data->data[i].data);
239 G_LOCK (g_dataset_global);
248 * @datalist: a datalist.
250 * Frees all the data elements of the datalist.
251 * The data elements' destroy functions are called
252 * if they have been set.
255 g_datalist_clear (GData **datalist)
260 g_return_if_fail (datalist != NULL);
262 g_datalist_lock (datalist);
264 data = G_DATALIST_GET_POINTER (datalist);
265 G_DATALIST_SET_POINTER (datalist, NULL);
267 g_datalist_unlock (datalist);
271 for (i = 0; i < data->len; i++)
273 if (data->data[i].data && data->data[i].destroy)
274 data->data[i].destroy (data->data[i].data);
281 /* HOLDS: g_dataset_global_lock */
282 static inline GDataset*
283 g_dataset_lookup (gconstpointer dataset_location)
285 register GDataset *dataset;
287 if (g_dataset_cached && g_dataset_cached->location == dataset_location)
288 return g_dataset_cached;
290 dataset = g_hash_table_lookup (g_dataset_location_ht, dataset_location);
292 g_dataset_cached = dataset;
297 /* HOLDS: g_dataset_global_lock */
299 g_dataset_destroy_internal (GDataset *dataset)
301 register gconstpointer dataset_location;
303 dataset_location = dataset->location;
306 if (G_DATALIST_GET_POINTER(&dataset->datalist) == NULL)
308 if (dataset == g_dataset_cached)
309 g_dataset_cached = NULL;
310 g_hash_table_remove (g_dataset_location_ht, dataset_location);
311 g_slice_free (GDataset, dataset);
315 g_datalist_clear_i (&dataset->datalist);
316 dataset = g_dataset_lookup (dataset_location);
322 * @dataset_location: the location identifying the dataset.
324 * Destroys the dataset, freeing all memory allocated, and calling any
325 * destroy functions set for data elements.
328 g_dataset_destroy (gconstpointer dataset_location)
330 g_return_if_fail (dataset_location != NULL);
332 G_LOCK (g_dataset_global);
333 if (g_dataset_location_ht)
335 register GDataset *dataset;
337 dataset = g_dataset_lookup (dataset_location);
339 g_dataset_destroy_internal (dataset);
341 G_UNLOCK (g_dataset_global);
344 /* HOLDS: g_dataset_global_lock if dataset != null */
345 static inline gpointer
346 g_data_set_internal (GData **datalist,
349 GDestroyNotify new_destroy_func,
353 GDataElt old, *data, *data_last, *data_end;
355 g_datalist_lock (datalist);
357 d = G_DATALIST_GET_POINTER (datalist);
359 if (new_data == NULL) /* remove */
364 data_last = data + d->len - 1;
365 while (data <= data_last)
367 if (data->key == key_id)
370 if (data != data_last)
374 /* We don't bother to shrink, but if all data are now gone
375 * we at least free the memory
379 G_DATALIST_SET_POINTER (datalist, NULL);
381 /* datalist may be situated in dataset, so must not be
382 * unlocked after we free it
384 g_datalist_unlock (datalist);
386 /* the dataset destruction *must* be done
387 * prior to invocation of the data destroy function
390 g_dataset_destroy_internal (dataset);
394 g_datalist_unlock (datalist);
397 /* We found and removed an old value
398 * the GData struct *must* already be unlinked
399 * when invoking the destroy function.
400 * we use (new_data==NULL && new_destroy_func!=NULL) as
401 * a special hint combination to "steal"
402 * data without destroy notification
404 if (old.destroy && !new_destroy_func)
407 G_UNLOCK (g_dataset_global);
408 old.destroy (old.data);
410 G_LOCK (g_dataset_global);
426 data_end = data + d->len;
427 while (data < data_end)
429 if (data->key == key_id)
433 data->data = new_data;
434 data->destroy = new_destroy_func;
435 g_datalist_unlock (datalist);
440 data->data = new_data;
441 data->destroy = new_destroy_func;
443 g_datalist_unlock (datalist);
445 /* We found and replaced an old value
446 * the GData struct *must* already be unlinked
447 * when invoking the destroy function.
450 G_UNLOCK (g_dataset_global);
451 old.destroy (old.data);
453 G_LOCK (g_dataset_global);
461 /* The key was not found, insert it */
465 d = g_malloc (sizeof (GData));
469 else if (d->len == d->alloc)
471 d->alloc = d->alloc * 2;
472 d = g_realloc (d, sizeof (GData) + (d->alloc - 1) * sizeof (GDataElt));
475 G_DATALIST_SET_POINTER (datalist, d);
477 d->data[d->len].key = key_id;
478 d->data[d->len].data = new_data;
479 d->data[d->len].destroy = new_destroy_func;
483 g_datalist_unlock (datalist);
490 * g_dataset_id_set_data_full:
491 * @dataset_location: the location identifying the dataset.
492 * @key_id: the #GQuark id to identify the data element.
493 * @data: the data element.
494 * @destroy_func: the function to call when the data element is
495 * removed. This function will be called with the data
496 * element and can be used to free any memory allocated
499 * Sets the data element associated with the given #GQuark id, and also
500 * the function to call when the data element is destroyed. Any
501 * previous data with the same key is removed, and its destroy function
505 * g_dataset_set_data_full:
506 * @l: the location identifying the dataset.
507 * @k: the string to identify the data element.
508 * @d: the data element.
509 * @f: the function to call when the data element is removed. This
510 * function will be called with the data element and can be used to
511 * free any memory allocated for it.
513 * Sets the data corresponding to the given string identifier, and the
514 * function to call when the data element is destroyed.
517 * g_dataset_id_set_data:
518 * @l: the location identifying the dataset.
519 * @k: the #GQuark id to identify the data element.
520 * @d: the data element.
522 * Sets the data element associated with the given #GQuark id. Any
523 * previous data with the same key is removed, and its destroy function
527 * g_dataset_set_data:
528 * @l: the location identifying the dataset.
529 * @k: the string to identify the data element.
530 * @d: the data element.
532 * Sets the data corresponding to the given string identifier.
535 * g_dataset_id_remove_data:
536 * @l: the location identifying the dataset.
537 * @k: the #GQuark id identifying the data element.
539 * Removes a data element from a dataset. The data element's destroy
540 * function is called if it has been set.
543 * g_dataset_remove_data:
544 * @l: the location identifying the dataset.
545 * @k: the string identifying the data element.
547 * Removes a data element corresponding to a string. Its destroy
548 * function is called if it has been set.
551 g_dataset_id_set_data_full (gconstpointer dataset_location,
554 GDestroyNotify destroy_func)
556 register GDataset *dataset;
558 g_return_if_fail (dataset_location != NULL);
560 g_return_if_fail (destroy_func == NULL);
564 g_return_if_fail (key_id > 0);
569 G_LOCK (g_dataset_global);
570 if (!g_dataset_location_ht)
571 g_data_initialize ();
573 dataset = g_dataset_lookup (dataset_location);
576 dataset = g_slice_new (GDataset);
577 dataset->location = dataset_location;
578 g_datalist_init (&dataset->datalist);
579 g_hash_table_insert (g_dataset_location_ht,
580 (gpointer) dataset->location,
584 g_data_set_internal (&dataset->datalist, key_id, data, destroy_func, dataset);
585 G_UNLOCK (g_dataset_global);
589 * g_datalist_id_set_data_full:
590 * @datalist: a datalist.
591 * @key_id: the #GQuark to identify the data element.
592 * @data: (allow-none): the data element or %NULL to remove any previous element
593 * corresponding to @key_id.
594 * @destroy_func: the function to call when the data element is
595 * removed. This function will be called with the data
596 * element and can be used to free any memory allocated
597 * for it. If @data is %NULL, then @destroy_func must
600 * Sets the data corresponding to the given #GQuark id, and the
601 * function to be called when the element is removed from the datalist.
602 * Any previous data with the same key is removed, and its destroy
603 * function is called.
606 * g_datalist_set_data_full:
608 * @k: the string to identify the data element.
609 * @d: (allow-none): the data element, or %NULL to remove any previous element
610 * corresponding to @k.
611 * @f: the function to call when the data element is removed. This
612 * function will be called with the data element and can be used to
613 * free any memory allocated for it. If @d is %NULL, then @f must
616 * Sets the data element corresponding to the given string identifier,
617 * and the function to be called when the data element is removed.
620 * g_datalist_id_set_data:
622 * @q: the #GQuark to identify the data element.
623 * @d: (allow-none): the data element, or %NULL to remove any previous element
624 * corresponding to @q.
626 * Sets the data corresponding to the given #GQuark id. Any previous
627 * data with the same key is removed, and its destroy function is
631 * g_datalist_set_data:
633 * @k: the string to identify the data element.
634 * @d: (allow-none): the data element, or %NULL to remove any previous element
635 * corresponding to @k.
637 * Sets the data element corresponding to the given string identifier.
640 * g_datalist_id_remove_data:
642 * @q: the #GQuark identifying the data element.
644 * Removes an element, using its #GQuark identifier.
647 * g_datalist_remove_data:
649 * @k: the string identifying the data element.
651 * Removes an element using its string identifier. The data element's
652 * destroy function is called if it has been set.
655 g_datalist_id_set_data_full (GData **datalist,
658 GDestroyNotify destroy_func)
660 g_return_if_fail (datalist != NULL);
662 g_return_if_fail (destroy_func == NULL);
666 g_return_if_fail (key_id > 0);
671 g_data_set_internal (datalist, key_id, data, destroy_func, NULL);
675 * g_dataset_id_remove_no_notify:
676 * @dataset_location: the location identifying the dataset.
677 * @key_id: the #GQuark ID identifying the data element.
679 * Removes an element, without calling its destroy notification
682 * Returns: the data previously stored at @key_id, or %NULL if none.
685 * g_dataset_remove_no_notify:
686 * @l: the location identifying the dataset.
687 * @k: the string identifying the data element.
689 * Removes an element, without calling its destroy notifier.
692 g_dataset_id_remove_no_notify (gconstpointer dataset_location,
695 gpointer ret_data = NULL;
697 g_return_val_if_fail (dataset_location != NULL, NULL);
699 G_LOCK (g_dataset_global);
700 if (key_id && g_dataset_location_ht)
704 dataset = g_dataset_lookup (dataset_location);
706 ret_data = g_data_set_internal (&dataset->datalist, key_id, NULL, (GDestroyNotify) 42, dataset);
708 G_UNLOCK (g_dataset_global);
714 * g_datalist_id_remove_no_notify:
715 * @datalist: a datalist.
716 * @key_id: the #GQuark identifying a data element.
718 * Removes an element, without calling its destroy notification
721 * Returns: the data previously stored at @key_id, or %NULL if none.
724 * g_datalist_remove_no_notify:
726 * @k: the string identifying the data element.
728 * Removes an element, without calling its destroy notifier.
731 g_datalist_id_remove_no_notify (GData **datalist,
734 gpointer ret_data = NULL;
736 g_return_val_if_fail (datalist != NULL, NULL);
739 ret_data = g_data_set_internal (datalist, key_id, NULL, (GDestroyNotify) 42, NULL);
745 * g_dataset_id_get_data:
746 * @dataset_location: the location identifying the dataset.
747 * @key_id: the #GQuark id to identify the data element.
749 * Gets the data element corresponding to a #GQuark.
751 * Returns: the data element corresponding to the #GQuark, or %NULL if
755 * g_dataset_get_data:
756 * @l: the location identifying the dataset.
757 * @k: the string identifying the data element.
759 * Gets the data element corresponding to a string.
761 * Returns: the data element corresponding to the string, or %NULL if
765 g_dataset_id_get_data (gconstpointer dataset_location,
768 gpointer retval = NULL;
770 g_return_val_if_fail (dataset_location != NULL, NULL);
772 G_LOCK (g_dataset_global);
773 if (key_id && g_dataset_location_ht)
777 dataset = g_dataset_lookup (dataset_location);
779 retval = g_datalist_id_get_data (&dataset->datalist, key_id);
781 G_UNLOCK (g_dataset_global);
787 * g_datalist_id_get_data:
788 * @datalist: a datalist.
789 * @key_id: the #GQuark identifying a data element.
791 * Retrieves the data element corresponding to @key_id.
793 * Returns: the data element, or %NULL if it is not found.
796 g_datalist_id_get_data (GData **datalist,
799 return g_datalist_id_dup_data (datalist, key_id, NULL, NULL);
804 * @data: the data to duplicate
805 * @user_data: user data that was specified in g_datalist_id_dup_data()
807 * The type of functions that are used to 'duplicate' an object.
808 * What this means depends on the context, it could just be
809 * incrementing the reference count, if @data is a ref-counted
812 * Returns: a duplicate of data
816 * g_datalist_id_dup_data:
817 * @datalist: location of a datalist
818 * @key_id: the #GQuark identifying a data element
819 * @dup_func: (allow-none): function to duplicate the old value
820 * @user_data: (allow-none): passed as user_data to @dup_func
822 * This is a variant of g_datalist_id_get_data() which
823 * returns a 'duplicate' of the value. @dup_func defines the
824 * meaning of 'duplicate' in this context, it could e.g.
825 * take a reference on a ref-counted object.
827 * If the @key_id is not set in the datalist then @dup_func
828 * will be called with a %NULL argument.
830 * Note that @dup_func is called while the datalist is locked, so it
831 * is not allowed to read or modify the datalist.
833 * This function can be useful to avoid races when multiple
834 * threads are using the same datalist and the same key.
836 * Returns: the result of calling @dup_func on the value
837 * associated with @key_id in @datalist, or %NULL if not set.
838 * If @dup_func is %NULL, the value is returned unmodified.
843 g_datalist_id_dup_data (GData **datalist,
845 GDuplicateFunc dup_func,
849 gpointer retval = NULL;
851 GDataElt *data, *data_end;
853 g_return_val_if_fail (datalist != NULL, NULL);
854 g_return_val_if_fail (key_id != 0, NULL);
856 g_datalist_lock (datalist);
858 d = G_DATALIST_GET_POINTER (datalist);
862 data_end = data + d->len - 1;
863 while (data <= data_end)
865 if (data->key == key_id)
875 retval = dup_func (val, user_data);
879 g_datalist_unlock (datalist);
885 * g_datalist_id_replace_data:
886 * @datalist: location of a datalist
887 * @key_id: the #GQuark identifying a data element
888 * @oldval: (allow-none): the old value to compare against
889 * @newval: (allow-none): the new value to replace it with
890 * @destroy: (allow-none): destroy notify for the new value
891 * @old_destroy: (allow-none): destroy notify for the existing value
893 * Compares the member that is associated with @key_id in
894 * @datalist to @oldval, and if they are the same, replace
895 * @oldval with @newval.
897 * This is like a typical atomic compare-and-exchange
898 * operation, for a member of @datalist.
900 * If the previous value was replaced then ownership of the
901 * old value (@oldval) is passed to the caller, including
902 * the registred destroy notify for it (passed out in @old_destroy).
903 * Its up to the caller to free this as he wishes, which may
904 * or may not include using @old_destroy as sometimes replacement
905 * should not destroy the object in the normal way.
907 * Return: %TRUE if the existing value for @key_id was replaced
908 * by @newval, %FALSE otherwise.
913 g_datalist_id_replace_data (GData **datalist,
917 GDestroyNotify destroy,
918 GDestroyNotify *old_destroy)
922 GDataElt *data, *data_end;
924 g_return_val_if_fail (datalist != NULL, FALSE);
925 g_return_val_if_fail (key_id != 0, FALSE);
930 g_datalist_lock (datalist);
932 d = G_DATALIST_GET_POINTER (datalist);
936 data_end = data + d->len - 1;
937 while (data <= data_end)
939 if (data->key == key_id)
945 *old_destroy = data->destroy;
949 data->destroy = destroy;
953 if (data != data_end)
957 /* We don't bother to shrink, but if all data are now gone
958 * we at least free the memory
962 G_DATALIST_SET_POINTER (datalist, NULL);
973 if (val == NULL && oldval == NULL && newval != NULL)
981 d = g_malloc (sizeof (GData));
985 else if (d->len == d->alloc)
987 d->alloc = d->alloc * 2;
988 d = g_realloc (d, sizeof (GData) + (d->alloc - 1) * sizeof (GDataElt));
991 G_DATALIST_SET_POINTER (datalist, d);
993 d->data[d->len].key = key_id;
994 d->data[d->len].data = newval;
995 d->data[d->len].destroy = destroy;
999 g_datalist_unlock (datalist);
1001 return val == oldval;
1005 * g_datalist_get_data:
1006 * @datalist: a datalist.
1007 * @key: the string identifying a data element.
1009 * Gets a data element, using its string identifier. This is slower than
1010 * g_datalist_id_get_data() because it compares strings.
1012 * Returns: the data element, or %NULL if it is not found.
1015 g_datalist_get_data (GData **datalist,
1018 gpointer res = NULL;
1020 GDataElt *data, *data_end;
1022 g_return_val_if_fail (datalist != NULL, NULL);
1024 g_datalist_lock (datalist);
1026 d = G_DATALIST_GET_POINTER (datalist);
1030 data_end = data + d->len;
1031 while (data < data_end)
1033 if (strcmp (g_quark_to_string (data->key), key) == 0)
1042 g_datalist_unlock (datalist);
1049 * @key_id: the #GQuark id to identifying the data element.
1050 * @data: the data element.
1051 * @user_data: user data passed to g_dataset_foreach().
1053 * Specifies the type of function passed to g_dataset_foreach(). It is
1054 * called with each #GQuark id and associated data element, together
1055 * with the @user_data parameter supplied to g_dataset_foreach().
1059 * g_dataset_foreach:
1060 * @dataset_location: the location identifying the dataset.
1061 * @func: the function to call for each data element.
1062 * @user_data: user data to pass to the function.
1064 * Calls the given function for each data element which is associated
1065 * with the given location. Note that this function is NOT thread-safe.
1066 * So unless @datalist can be protected from any modifications during
1067 * invocation of this function, it should not be called.
1070 g_dataset_foreach (gconstpointer dataset_location,
1071 GDataForeachFunc func,
1074 register GDataset *dataset;
1076 g_return_if_fail (dataset_location != NULL);
1077 g_return_if_fail (func != NULL);
1079 G_LOCK (g_dataset_global);
1080 if (g_dataset_location_ht)
1082 dataset = g_dataset_lookup (dataset_location);
1083 G_UNLOCK (g_dataset_global);
1085 g_datalist_foreach (&dataset->datalist, func, user_data);
1089 G_UNLOCK (g_dataset_global);
1094 * g_datalist_foreach:
1095 * @datalist: a datalist.
1096 * @func: the function to call for each data element.
1097 * @user_data: user data to pass to the function.
1099 * Calls the given function for each data element of the datalist. The
1100 * function is called with each data element's #GQuark id and data,
1101 * together with the given @user_data parameter. Note that this
1102 * function is NOT thread-safe. So unless @datalist can be protected
1103 * from any modifications during invocation of this function, it should
1107 g_datalist_foreach (GData **datalist,
1108 GDataForeachFunc func,
1115 g_return_if_fail (datalist != NULL);
1116 g_return_if_fail (func != NULL);
1118 d = G_DATALIST_GET_POINTER (datalist);
1122 /* We make a copy of the keys so that we can handle it changing
1125 keys = g_new (GQuark, len);
1126 for (i = 0; i < len; i++)
1127 keys[i] = d->data[i].key;
1129 for (i = 0; i < len; i++)
1131 /* A previous callback might have removed a later item, so always check that
1132 it still exists before calling */
1133 d = G_DATALIST_GET_POINTER (datalist);
1137 for (j = 0; j < d->len; j++)
1139 if (d->data[j].key == keys[i]) {
1140 func (d->data[i].key, d->data[i].data, user_data);
1150 * @datalist: a pointer to a pointer to a datalist.
1152 * Resets the datalist to %NULL. It does not free any memory or call
1153 * any destroy functions.
1156 g_datalist_init (GData **datalist)
1158 g_return_if_fail (datalist != NULL);
1160 g_atomic_pointer_set (datalist, NULL);
1164 * g_datalist_set_flags:
1165 * @datalist: pointer to the location that holds a list
1166 * @flags: the flags to turn on. The values of the flags are
1167 * restricted by %G_DATALIST_FLAGS_MASK (currently
1168 * 3; giving two possible boolean flags).
1169 * A value for @flags that doesn't fit within the mask is
1172 * Turns on flag values for a data list. This function is used
1173 * to keep a small number of boolean flags in an object with
1174 * a data list without using any additional space. It is
1175 * not generally useful except in circumstances where space
1176 * is very tight. (It is used in the base #GObject type, for
1182 g_datalist_set_flags (GData **datalist,
1185 g_return_if_fail (datalist != NULL);
1186 g_return_if_fail ((flags & ~G_DATALIST_FLAGS_MASK) == 0);
1188 g_atomic_pointer_or (datalist, (gsize)flags);
1192 * g_datalist_unset_flags:
1193 * @datalist: pointer to the location that holds a list
1194 * @flags: the flags to turn off. The values of the flags are
1195 * restricted by %G_DATALIST_FLAGS_MASK (currently
1196 * 3: giving two possible boolean flags).
1197 * A value for @flags that doesn't fit within the mask is
1200 * Turns off flag values for a data list. See g_datalist_unset_flags()
1205 g_datalist_unset_flags (GData **datalist,
1208 g_return_if_fail (datalist != NULL);
1209 g_return_if_fail ((flags & ~G_DATALIST_FLAGS_MASK) == 0);
1211 g_atomic_pointer_and (datalist, ~(gsize)flags);
1215 * g_datalist_get_flags:
1216 * @datalist: pointer to the location that holds a list
1218 * Gets flags values packed in together with the datalist.
1219 * See g_datalist_set_flags().
1221 * Return value: the flags of the datalist
1226 g_datalist_get_flags (GData **datalist)
1228 g_return_val_if_fail (datalist != NULL, 0);
1230 return G_DATALIST_GET_FLAGS (datalist); /* atomic macro */
1233 /* HOLDS: g_dataset_global_lock */
1235 g_data_initialize (void)
1237 g_return_if_fail (g_dataset_location_ht == NULL);
1239 g_dataset_location_ht = g_hash_table_new (g_direct_hash, NULL);
1240 g_dataset_cached = NULL;