* Copyright (C) 1998 Tim Janik
*
* This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Library General Public
+ * modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Library General Public License for more details.
+ * Lesser General Public License for more details.
*
- * You should have received a copy of the GNU Library General Public
- * License along with this library; if not, write to the
- * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- * Boston, MA 02111-1307, USA.
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
/*
* MT safe
*/
-#include "glib.h"
+/**
+ * SECTION:queue
+ * @Title: Double-ended Queues
+ * @Short_description: double-ended queue data structure
+ *
+ * The #GQueue structure and its associated functions provide a standard
+ * queue data structure. Internally, GQueue uses the same data structure
+ * as #GList to store elements.
+ *
+ * The data contained in each element can be either integer values, by
+ * using one of the [Type Conversion Macros][glib-Type-Conversion-Macros],
+ * or simply pointers to any type of data.
+ *
+ * To create a new GQueue, use g_queue_new().
+ *
+ * To initialize a statically-allocated GQueue, use #G_QUEUE_INIT or
+ * g_queue_init().
+ *
+ * To add elements, use g_queue_push_head(), g_queue_push_head_link(),
+ * g_queue_push_tail() and g_queue_push_tail_link().
+ *
+ * To remove elements, use g_queue_pop_head() and g_queue_pop_tail().
+ *
+ * To free the entire queue, use g_queue_free().
+ */
+#include "config.h"
+#include "gqueue.h"
-G_LOCK_DEFINE_STATIC (queue_memchunk);
-static GMemChunk *queue_memchunk = NULL;
-static GTrashStack *free_queue_nodes = NULL;
+#include "gtestutils.h"
+#include "gslice.h"
-GQueue*
+/**
+ * g_queue_new:
+ *
+ * Creates a new #GQueue.
+ *
+ * Returns: a newly allocated #GQueue
+ **/
+GQueue *
g_queue_new (void)
{
- GQueue *queue;
+ return g_slice_new0 (GQueue);
+}
- G_LOCK (queue_memchunk);
- queue = g_trash_stack_pop (&free_queue_nodes);
+/**
+ * g_queue_free:
+ * @queue: a #GQueue
+ *
+ * Frees the memory allocated for the #GQueue. Only call this function
+ * if @queue was created with g_queue_new(). If queue elements contain
+ * dynamically-allocated memory, they should be freed first.
+ *
+ * If queue elements contain dynamically-allocated memory, you should
+ * either use g_queue_free_full() or free them manually first.
+ **/
+void
+g_queue_free (GQueue *queue)
+{
+ g_return_if_fail (queue != NULL);
- if (!queue)
- {
- if (!queue_memchunk)
- queue_memchunk = g_mem_chunk_new ("GLib GQueue chunk",
- sizeof (GNode),
- sizeof (GNode) * 128,
- G_ALLOC_ONLY);
- queue = g_chunk_new (GQueue, queue_memchunk);
- }
- G_UNLOCK (queue_memchunk);
+ g_list_free (queue->head);
+ g_slice_free (GQueue, queue);
+}
- queue->head = NULL;
- queue->tail = NULL;
- queue->length = 0;
+/**
+ * g_queue_free_full:
+ * @queue: a pointer to a #GQueue
+ * @free_func: the function to be called to free each element's data
+ *
+ * Convenience method, which frees all the memory used by a #GQueue,
+ * and calls the specified destroy function on every element's data.
+ *
+ * Since: 2.32
+ */
+void
+g_queue_free_full (GQueue *queue,
+ GDestroyNotify free_func)
+{
+ g_queue_foreach (queue, (GFunc) free_func, NULL);
+ g_queue_free (queue);
+}
- return queue;
+/**
+ * g_queue_init:
+ * @queue: an uninitialized #GQueue
+ *
+ * A statically-allocated #GQueue must be initialized with this function
+ * before it can be used. Alternatively you can initialize it with
+ * #G_QUEUE_INIT. It is not necessary to initialize queues created with
+ * g_queue_new().
+ *
+ * Since: 2.14
+ */
+void
+g_queue_init (GQueue *queue)
+{
+ g_return_if_fail (queue != NULL);
+
+ queue->head = queue->tail = NULL;
+ queue->length = 0;
}
+/**
+ * g_queue_clear:
+ * @queue: a #GQueue
+ *
+ * Removes all the elements in @queue. If queue elements contain
+ * dynamically-allocated memory, they should be freed first.
+ *
+ * Since: 2.14
+ */
void
-g_queue_free (GQueue *queue)
+g_queue_clear (GQueue *queue)
{
g_return_if_fail (queue != NULL);
g_list_free (queue->head);
+ g_queue_init (queue);
+}
+
+/**
+ * g_queue_is_empty:
+ * @queue: a #GQueue.
+ *
+ * Returns %TRUE if the queue is empty.
+ *
+ * Returns: %TRUE if the queue is empty
+ */
+gboolean
+g_queue_is_empty (GQueue *queue)
+{
+ g_return_val_if_fail (queue != NULL, TRUE);
+
+ return queue->head == NULL;
+}
+
+/**
+ * g_queue_get_length:
+ * @queue: a #GQueue
+ *
+ * Returns the number of items in @queue.
+ *
+ * Returns: the number of items in @queue
+ *
+ * Since: 2.4
+ */
+guint
+g_queue_get_length (GQueue *queue)
+{
+ g_return_val_if_fail (queue != NULL, 0);
+
+ return queue->length;
+}
-#ifdef ENABLE_GC_FRIENDLY
- queue->head = NULL;
- queue->tail = NULL;
-#endif /* ENABLE_GC_FRIENDLY */
+/**
+ * g_queue_reverse:
+ * @queue: a #GQueue
+ *
+ * Reverses the order of the items in @queue.
+ *
+ * Since: 2.4
+ */
+void
+g_queue_reverse (GQueue *queue)
+{
+ g_return_if_fail (queue != NULL);
- G_LOCK (queue_memchunk);
- g_trash_stack_push (&free_queue_nodes, queue);
- G_UNLOCK (queue_memchunk);
+ queue->tail = queue->head;
+ queue->head = g_list_reverse (queue->head);
}
+/**
+ * g_queue_copy:
+ * @queue: a #GQueue
+ *
+ * Copies a @queue. Note that is a shallow copy. If the elements in the
+ * queue consist of pointers to data, the pointers are copied, but the
+ * actual data is not.
+ *
+ * Returns: a copy of @queue
+ *
+ * Since: 2.4
+ */
+GQueue *
+g_queue_copy (GQueue *queue)
+{
+ GQueue *result;
+ GList *list;
+
+ g_return_val_if_fail (queue != NULL, NULL);
+
+ result = g_queue_new ();
+
+ for (list = queue->head; list != NULL; list = list->next)
+ g_queue_push_tail (result, list->data);
+
+ return result;
+}
+
+/**
+ * g_queue_foreach:
+ * @queue: a #GQueue
+ * @func: the function to call for each element's data
+ * @user_data: user data to pass to @func
+ *
+ * Calls @func for each element in the queue passing @user_data to the
+ * function.
+ *
+ * Since: 2.4
+ */
void
-g_queue_push_head (GQueue *queue,
- gpointer data)
+g_queue_foreach (GQueue *queue,
+ GFunc func,
+ gpointer user_data)
+{
+ GList *list;
+
+ g_return_if_fail (queue != NULL);
+ g_return_if_fail (func != NULL);
+
+ list = queue->head;
+ while (list)
+ {
+ GList *next = list->next;
+ func (list->data, user_data);
+ list = next;
+ }
+}
+
+/**
+ * g_queue_find:
+ * @queue: a #GQueue
+ * @data: data to find
+ *
+ * Finds the first link in @queue which contains @data.
+ *
+ * Returns: the first link in @queue which contains @data
+ *
+ * Since: 2.4
+ */
+GList *
+g_queue_find (GQueue *queue,
+ gconstpointer data)
+{
+ g_return_val_if_fail (queue != NULL, NULL);
+
+ return g_list_find (queue->head, data);
+}
+
+/**
+ * g_queue_find_custom:
+ * @queue: a #GQueue
+ * @data: user data passed to @func
+ * @func: a #GCompareFunc to call for each element. It should return 0
+ * when the desired element is found
+ *
+ * Finds an element in a #GQueue, using a supplied function to find the
+ * desired element. It iterates over the queue, calling the given function
+ * which should return 0 when the desired element is found. The function
+ * takes two gconstpointer arguments, the #GQueue element's data as the
+ * first argument and the given user data as the second argument.
+ *
+ * Returns: the found link, or %NULL if it wasn't found
+ *
+ * Since: 2.4
+ */
+GList *
+g_queue_find_custom (GQueue *queue,
+ gconstpointer data,
+ GCompareFunc func)
+{
+ g_return_val_if_fail (queue != NULL, NULL);
+ g_return_val_if_fail (func != NULL, NULL);
+
+ return g_list_find_custom (queue->head, data, func);
+}
+
+/**
+ * g_queue_sort:
+ * @queue: a #GQueue
+ * @compare_func: the #GCompareDataFunc used to sort @queue. This function
+ * is passed two elements of the queue and should return 0 if they are
+ * equal, a negative value if the first comes before the second, and
+ * a positive value if the second comes before the first.
+ * @user_data: user data passed to @compare_func
+ *
+ * Sorts @queue using @compare_func.
+ *
+ * Since: 2.4
+ */
+void
+g_queue_sort (GQueue *queue,
+ GCompareDataFunc compare_func,
+ gpointer user_data)
+{
+ g_return_if_fail (queue != NULL);
+ g_return_if_fail (compare_func != NULL);
+
+ queue->head = g_list_sort_with_data (queue->head, compare_func, user_data);
+ queue->tail = g_list_last (queue->head);
+}
+
+/**
+ * g_queue_push_head:
+ * @queue: a #GQueue.
+ * @data: the data for the new element.
+ *
+ * Adds a new element at the head of the queue.
+ */
+void
+g_queue_push_head (GQueue *queue,
+ gpointer data)
{
g_return_if_fail (queue != NULL);
queue->length++;
}
+/**
+ * g_queue_push_nth:
+ * @queue: a #GQueue
+ * @data: the data for the new element
+ * @n: the position to insert the new element. If @n is negative or
+ * larger than the number of elements in the @queue, the element is
+ * added to the end of the queue.
+ *
+ * Inserts a new element into @queue at the given position.
+ *
+ * Since: 2.4
+ */
+void
+g_queue_push_nth (GQueue *queue,
+ gpointer data,
+ gint n)
+{
+ g_return_if_fail (queue != NULL);
+
+ if (n < 0 || n >= queue->length)
+ {
+ g_queue_push_tail (queue, data);
+ return;
+ }
+
+ g_queue_insert_before (queue, g_queue_peek_nth_link (queue, n), data);
+}
+
+/**
+ * g_queue_push_head_link:
+ * @queue: a #GQueue
+ * @link_: a single #GList element, not a list with more than one element
+ *
+ * Adds a new element at the head of the queue.
+ */
void
g_queue_push_head_link (GQueue *queue,
- GList *link)
+ GList *link)
{
g_return_if_fail (queue != NULL);
g_return_if_fail (link != NULL);
queue->length++;
}
+/**
+ * g_queue_push_tail:
+ * @queue: a #GQueue
+ * @data: the data for the new element
+ *
+ * Adds a new element at the tail of the queue.
+ */
void
-g_queue_push_tail (GQueue *queue,
- gpointer data)
+g_queue_push_tail (GQueue *queue,
+ gpointer data)
{
g_return_if_fail (queue != NULL);
queue->length++;
}
+/**
+ * g_queue_push_tail_link:
+ * @queue: a #GQueue
+ * @link_: a single #GList element, not a list with more than one element
+ *
+ * Adds a new element at the tail of the queue.
+ */
void
g_queue_push_tail_link (GQueue *queue,
- GList *link)
+ GList *link)
{
g_return_if_fail (queue != NULL);
g_return_if_fail (link != NULL);
queue->length++;
}
+/**
+ * g_queue_push_nth_link:
+ * @queue: a #GQueue
+ * @n: the position to insert the link. If this is negative or larger than
+ * the number of elements in @queue, the link is added to the end of
+ * @queue.
+ * @link_: the link to add to @queue
+ *
+ * Inserts @link into @queue at the given position.
+ *
+ * Since: 2.4
+ */
+void
+g_queue_push_nth_link (GQueue *queue,
+ gint n,
+ GList *link_)
+{
+ GList *next;
+ GList *prev;
+
+ g_return_if_fail (queue != NULL);
+ g_return_if_fail (link_ != NULL);
+
+ if (n < 0 || n >= queue->length)
+ {
+ g_queue_push_tail_link (queue, link_);
+ return;
+ }
+
+ g_assert (queue->head);
+ g_assert (queue->tail);
+
+ next = g_queue_peek_nth_link (queue, n);
+ prev = next->prev;
+
+ if (prev)
+ prev->next = link_;
+ next->prev = link_;
+
+ link_->next = next;
+ link_->prev = prev;
+
+ if (queue->head->prev)
+ queue->head = queue->head->prev;
+
+ if (queue->tail->next)
+ queue->tail = queue->tail->next;
+
+ queue->length++;
+}
+
+/**
+ * g_queue_pop_head:
+ * @queue: a #GQueue
+ *
+ * Removes the first element of the queue and returns its data.
+ *
+ * Returns: the data of the first element in the queue, or %NULL
+ * if the queue is empty
+ */
gpointer
g_queue_pop_head (GQueue *queue)
{
queue->head = node->next;
if (queue->head)
- queue->head->prev = NULL;
+ queue->head->prev = NULL;
else
- queue->tail = NULL;
+ queue->tail = NULL;
g_list_free_1 (node);
queue->length--;
return NULL;
}
-GList*
+/**
+ * g_queue_pop_head_link:
+ * @queue: a #GQueue
+ *
+ * Removes and returns the first element of the queue.
+ *
+ * Returns: the #GList element at the head of the queue, or %NULL
+ * if the queue is empty
+ */
+GList *
g_queue_pop_head_link (GQueue *queue)
{
g_return_val_if_fail (queue != NULL, NULL);
queue->head = node->next;
if (queue->head)
- {
- queue->head->prev = NULL;
- node->next = NULL;
- }
+ {
+ queue->head->prev = NULL;
+ node->next = NULL;
+ }
else
- queue->tail = NULL;
+ queue->tail = NULL;
queue->length--;
return node;
return NULL;
}
+/**
+ * g_queue_peek_head_link:
+ * @queue: a #GQueue
+ *
+ * Returns the first link in @queue.
+ *
+ * Returns: the first link in @queue, or %NULL if @queue is empty
+ *
+ * Since: 2.4
+ */
+GList *
+g_queue_peek_head_link (GQueue *queue)
+{
+ g_return_val_if_fail (queue != NULL, NULL);
+
+ return queue->head;
+}
+
+/**
+ * g_queue_peek_tail_link:
+ * @queue: a #GQueue
+ *
+ * Returns the last link in @queue.
+ *
+ * Returns: the last link in @queue, or %NULL if @queue is empty
+ *
+ * Since: 2.4
+ */
+GList *
+g_queue_peek_tail_link (GQueue *queue)
+{
+ g_return_val_if_fail (queue != NULL, NULL);
+
+ return queue->tail;
+}
+
+/**
+ * g_queue_pop_tail:
+ * @queue: a #GQueue
+ *
+ * Removes the last element of the queue and returns its data.
+ *
+ * Returns: the data of the last element in the queue, or %NULL
+ * if the queue is empty
+ */
gpointer
g_queue_pop_tail (GQueue *queue)
{
queue->tail = node->prev;
if (queue->tail)
- queue->tail->next = NULL;
+ queue->tail->next = NULL;
else
- queue->head = NULL;
+ queue->head = NULL;
queue->length--;
g_list_free_1 (node);
return NULL;
}
-GList*
+/**
+ * g_queue_pop_nth:
+ * @queue: a #GQueue
+ * @n: the position of the element
+ *
+ * Removes the @n'th element of @queue and returns its data.
+ *
+ * Returns: the element's data, or %NULL if @n is off the end of @queue
+ *
+ * Since: 2.4
+ */
+gpointer
+g_queue_pop_nth (GQueue *queue,
+ guint n)
+{
+ GList *nth_link;
+ gpointer result;
+
+ g_return_val_if_fail (queue != NULL, NULL);
+
+ if (n >= queue->length)
+ return NULL;
+
+ nth_link = g_queue_peek_nth_link (queue, n);
+ result = nth_link->data;
+
+ g_queue_delete_link (queue, nth_link);
+
+ return result;
+}
+
+/**
+ * g_queue_pop_tail_link:
+ * @queue: a #GQueue
+ *
+ * Removes and returns the last element of the queue.
+ *
+ * Returns: the #GList element at the tail of the queue, or %NULL
+ * if the queue is empty
+ */
+GList *
g_queue_pop_tail_link (GQueue *queue)
{
g_return_val_if_fail (queue != NULL, NULL);
queue->tail = node->prev;
if (queue->tail)
- {
- queue->tail->next = NULL;
- node->prev = NULL;
- }
+ {
+ queue->tail->next = NULL;
+ node->prev = NULL;
+ }
else
- queue->head = NULL;
+ queue->head = NULL;
queue->length--;
return node;
return NULL;
}
-gboolean
-g_queue_is_empty (GQueue *queue)
+/**
+ * g_queue_pop_nth_link:
+ * @queue: a #GQueue
+ * @n: the link's position
+ *
+ * Removes and returns the link at the given position.
+ *
+ * Returns: the @n'th link, or %NULL if @n is off the end of @queue
+ *
+ * Since: 2.4
+ */
+GList*
+g_queue_pop_nth_link (GQueue *queue,
+ guint n)
{
- g_return_val_if_fail (queue != NULL, TRUE);
+ GList *link;
+
+ g_return_val_if_fail (queue != NULL, NULL);
- return queue->head == NULL;
+ if (n >= queue->length)
+ return NULL;
+
+ link = g_queue_peek_nth_link (queue, n);
+ g_queue_unlink (queue, link);
+
+ return link;
}
+/**
+ * g_queue_peek_nth_link:
+ * @queue: a #GQueue
+ * @n: the position of the link
+ *
+ * Returns the link at the given position
+ *
+ * Returns: the link at the @n'th position, or %NULL
+ * if @n is off the end of the list
+ *
+ * Since: 2.4
+ */
+GList *
+g_queue_peek_nth_link (GQueue *queue,
+ guint n)
+{
+ GList *link;
+ gint i;
+
+ g_return_val_if_fail (queue != NULL, NULL);
+
+ if (n >= queue->length)
+ return NULL;
+
+ if (n > queue->length / 2)
+ {
+ n = queue->length - n - 1;
+
+ link = queue->tail;
+ for (i = 0; i < n; ++i)
+ link = link->prev;
+ }
+ else
+ {
+ link = queue->head;
+ for (i = 0; i < n; ++i)
+ link = link->next;
+ }
+
+ return link;
+}
+
+/**
+ * g_queue_link_index:
+ * @queue: a #GQueue
+ * @link_: a #GList link
+ *
+ * Returns the position of @link_ in @queue.
+ *
+ * Returns: the position of @link_, or -1 if the link is
+ * not part of @queue
+ *
+ * Since: 2.4
+ */
+gint
+g_queue_link_index (GQueue *queue,
+ GList *link_)
+{
+ g_return_val_if_fail (queue != NULL, -1);
+
+ return g_list_position (queue->head, link_);
+}
+
+/**
+ * g_queue_unlink:
+ * @queue: a #GQueue
+ * @link_: a #GList link that must be part of @queue
+ *
+ * Unlinks @link_ so that it will no longer be part of @queue.
+ * The link is not freed.
+ *
+ * @link_ must be part of @queue.
+ *
+ * Since: 2.4
+ */
+void
+g_queue_unlink (GQueue *queue,
+ GList *link_)
+{
+ g_return_if_fail (queue != NULL);
+ g_return_if_fail (link_ != NULL);
+
+ if (link_ == queue->tail)
+ queue->tail = queue->tail->prev;
+
+ queue->head = g_list_remove_link (queue->head, link_);
+ queue->length--;
+}
+
+/**
+ * g_queue_delete_link:
+ * @queue: a #GQueue
+ * @link_: a #GList link that must be part of @queue
+ *
+ * Removes @link_ from @queue and frees it.
+ *
+ * @link_ must be part of @queue.
+ *
+ * Since: 2.4
+ */
+void
+g_queue_delete_link (GQueue *queue,
+ GList *link_)
+{
+ g_return_if_fail (queue != NULL);
+ g_return_if_fail (link_ != NULL);
+
+ g_queue_unlink (queue, link_);
+ g_list_free (link_);
+}
+
+/**
+ * g_queue_peek_head:
+ * @queue: a #GQueue
+ *
+ * Returns the first element of the queue.
+ *
+ * Returns: the data of the first element in the queue, or %NULL
+ * if the queue is empty
+ */
gpointer
g_queue_peek_head (GQueue *queue)
{
return queue->head ? queue->head->data : NULL;
}
+/**
+ * g_queue_peek_tail:
+ * @queue: a #GQueue
+ *
+ * Returns the last element of the queue.
+ *
+ * Returns: the data of the last element in the queue, or %NULL
+ * if the queue is empty
+ */
gpointer
g_queue_peek_tail (GQueue *queue)
{
return queue->tail ? queue->tail->data : NULL;
}
+
+/**
+ * g_queue_peek_nth:
+ * @queue: a #GQueue
+ * @n: the position of the element
+ *
+ * Returns the @n'th element of @queue.
+ *
+ * Returns: the data for the @n'th element of @queue,
+ * or %NULL if @n is off the end of @queue
+ *
+ * Since: 2.4
+ */
+gpointer
+g_queue_peek_nth (GQueue *queue,
+ guint n)
+{
+ GList *link;
+
+ g_return_val_if_fail (queue != NULL, NULL);
+
+ link = g_queue_peek_nth_link (queue, n);
+
+ if (link)
+ return link->data;
+
+ return NULL;
+}
+
+/**
+ * g_queue_index:
+ * @queue: a #GQueue
+ * @data: the data to find
+ *
+ * Returns the position of the first element in @queue which contains @data.
+ *
+ * Returns: the position of the first element in @queue which
+ * contains @data, or -1 if no element in @queue contains @data
+ *
+ * Since: 2.4
+ */
+gint
+g_queue_index (GQueue *queue,
+ gconstpointer data)
+{
+ g_return_val_if_fail (queue != NULL, -1);
+
+ return g_list_index (queue->head, data);
+}
+
+/**
+ * g_queue_remove:
+ * @queue: a #GQueue
+ * @data: the data to remove
+ *
+ * Removes the first element in @queue that contains @data.
+ *
+ * Returns: %TRUE if @data was found and removed from @queue
+ *
+ * Since: 2.4
+ */
+gboolean
+g_queue_remove (GQueue *queue,
+ gconstpointer data)
+{
+ GList *link;
+
+ g_return_val_if_fail (queue != NULL, FALSE);
+
+ link = g_list_find (queue->head, data);
+
+ if (link)
+ g_queue_delete_link (queue, link);
+
+ return (link != NULL);
+}
+
+/**
+ * g_queue_remove_all:
+ * @queue: a #GQueue
+ * @data: the data to remove
+ *
+ * Remove all elements whose data equals @data from @queue.
+ *
+ * Returns: the number of elements removed from @queue
+ *
+ * Since: 2.4
+ */
+guint
+g_queue_remove_all (GQueue *queue,
+ gconstpointer data)
+{
+ GList *list;
+ guint old_length;
+
+ g_return_val_if_fail (queue != NULL, 0);
+
+ old_length = queue->length;
+
+ list = queue->head;
+ while (list)
+ {
+ GList *next = list->next;
+
+ if (list->data == data)
+ g_queue_delete_link (queue, list);
+
+ list = next;
+ }
+
+ return (old_length - queue->length);
+}
+
+/**
+ * g_queue_insert_before:
+ * @queue: a #GQueue
+ * @sibling: (nullable): a #GList link that must be part of @queue, or %NULL to
+ * push at the tail of the queue.
+ * @data: the data to insert
+ *
+ * Inserts @data into @queue before @sibling.
+ *
+ * @sibling must be part of @queue. Since GLib 2.44 a %NULL sibling pushes the
+ * data at the tail of the queue.
+ *
+ * Since: 2.4
+ */
+void
+g_queue_insert_before (GQueue *queue,
+ GList *sibling,
+ gpointer data)
+{
+ g_return_if_fail (queue != NULL);
+
+ if (sibling == NULL)
+ {
+ /* We don't use g_list_insert_before() with a NULL sibling because it
+ * would be a O(n) operation and we would need to update manually the tail
+ * pointer.
+ */
+ g_queue_push_tail (queue, data);
+ }
+ else
+ {
+ queue->head = g_list_insert_before (queue->head, sibling, data);
+ queue->length++;
+ }
+}
+
+/**
+ * g_queue_insert_after:
+ * @queue: a #GQueue
+ * @sibling: (nullable): a #GList link that must be part of @queue, or %NULL to
+ * push at the head of the queue.
+ * @data: the data to insert
+ *
+ * Inserts @data into @queue after @sibling.
+ *
+ * @sibling must be part of @queue. Since GLib 2.44 a %NULL sibling pushes the
+ * data at the head of the queue.
+ *
+ * Since: 2.4
+ */
+void
+g_queue_insert_after (GQueue *queue,
+ GList *sibling,
+ gpointer data)
+{
+ g_return_if_fail (queue != NULL);
+
+ if (sibling == NULL)
+ g_queue_push_head (queue, data);
+ else
+ g_queue_insert_before (queue, sibling->next, data);
+}
+
+/**
+ * g_queue_insert_sorted:
+ * @queue: a #GQueue
+ * @data: the data to insert
+ * @func: the #GCompareDataFunc used to compare elements in the queue. It is
+ * called with two elements of the @queue and @user_data. It should
+ * return 0 if the elements are equal, a negative value if the first
+ * element comes before the second, and a positive value if the second
+ * element comes before the first.
+ * @user_data: user data passed to @func
+ *
+ * Inserts @data into @queue using @func to determine the new position.
+ *
+ * Since: 2.4
+ */
+void
+g_queue_insert_sorted (GQueue *queue,
+ gpointer data,
+ GCompareDataFunc func,
+ gpointer user_data)
+{
+ GList *list;
+
+ g_return_if_fail (queue != NULL);
+
+ list = queue->head;
+ while (list && func (list->data, data, user_data) < 0)
+ list = list->next;
+
+ g_queue_insert_before (queue, list, data);
+}
projects / platform / upstream / glib.git / blobdiff