* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* 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.
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
*
- * You should have received a copy of the GNU Library General Public
+ * You should have received a copy of the GNU Lesser 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.
*/
+
+/*
+ * Modified by the GLib Team and others 1997-2000. See the AUTHORS
+ * file for a list of people on the GLib Team. See the ChangeLog
+ * files for a list of changes. These files are distributed with
+ * GLib at ftp://ftp.gtk.org/pub/gtk/.
+ */
+
+/*
+ * MT safe
+ */
+
+#include "config.h"
+
#include "glib.h"
+#include "galias.h"
#define HASH_TABLE_MIN_SIZE 11
struct _GHashNode
{
- gpointer key;
- gpointer value;
+ gpointer key;
+ gpointer value;
GHashNode *next;
+ guint key_hash;
};
struct _GHashTable
{
- gint size;
- gint nnodes;
- guint frozen;
- GHashNode **nodes;
- GHashFunc hash_func;
- GCompareFunc key_compare_func;
+ gint size;
+ gint nnodes;
+ GHashNode **nodes;
+ GHashFunc hash_func;
+ GEqualFunc key_equal_func;
+ volatile gint ref_count;
+ GDestroyNotify key_destroy_func;
+ GDestroyNotify value_destroy_func;
};
+static void g_hash_table_resize (GHashTable *hash_table);
+static GHashNode** g_hash_table_lookup_node (GHashTable *hash_table,
+ gconstpointer key,
+ guint *hash_return);
+static GHashNode* g_hash_node_new (gpointer key,
+ gpointer value,
+ guint key_hash);
+static guint g_hash_table_foreach_remove_or_steal (GHashTable *hash_table,
+ GHRFunc func,
+ gpointer user_data,
+ gboolean notify);
+static void g_hash_table_remove_all_nodes (GHashTable *hash_table,
+ gboolean notify);
-static void g_hash_table_resize (GHashTable *hash_table);
-static GHashNode** g_hash_table_lookup_node (GHashTable *hash_table,
- gconstpointer key);
-static GHashNode* g_hash_node_new (gpointer key,
- gpointer value);
-static void g_hash_node_destroy (GHashNode *hash_node);
-static void g_hash_nodes_destroy (GHashNode *hash_node);
+static inline void
+g_hash_table_maybe_resize (GHashTable *hash_table)
+{
+ gint nnodes = hash_table->nnodes;
+ gint size = hash_table->size;
+ if ((size >= 3 * nnodes && size > HASH_TABLE_MIN_SIZE) ||
+ (3 * size <= nnodes && size < HASH_TABLE_MAX_SIZE))
+ g_hash_table_resize (hash_table);
+}
-static GMemChunk *node_mem_chunk = NULL;
-static GHashNode *node_free_list = NULL;
+/**
+ * g_hash_table_new:
+ * @hash_func: a function to create a hash value from a key.
+ * Hash values are used to determine where keys are stored within the
+ * #GHashTable data structure. The g_direct_hash(), g_int_hash() and
+ * g_str_hash() functions are provided for some common types of keys.
+ * If hash_func is %NULL, g_direct_hash() is used.
+ * @key_equal_func: a function to check two keys for equality. This is
+ * used when looking up keys in the #GHashTable. The g_direct_equal(),
+ * g_int_equal() and g_str_equal() functions are provided for the most
+ * common types of keys. If @key_equal_func is %NULL, keys are compared
+ * directly in a similar fashion to g_direct_equal(), but without the
+ * overhead of a function call.
+ *
+ * Creates a new #GHashTable with a reference count of 1.
+ *
+ * Return value: a new #GHashTable.
+ **/
+GHashTable*
+g_hash_table_new (GHashFunc hash_func,
+ GEqualFunc key_equal_func)
+{
+ return g_hash_table_new_full (hash_func, key_equal_func, NULL, NULL);
+}
+/**
+ * g_hash_table_new_full:
+ * @hash_func: a function to create a hash value from a key.
+ * @key_equal_func: a function to check two keys for equality.
+ * @key_destroy_func: a function to free the memory allocated for the key
+ * used when removing the entry from the #GHashTable or %NULL if you
+ * don't want to supply such a function.
+ * @value_destroy_func: a function to free the memory allocated for the
+ * value used when removing the entry from the #GHashTable or %NULL if
+ * you don't want to supply such a function.
+ *
+ * Creates a new #GHashTable like g_hash_table_new() with a reference count
+ * of 1 and allows to specify functions to free the memory allocated for the
+ * key and value that get called when removing the entry from the #GHashTable.
+ *
+ * Return value: a new #GHashTable.
+ **/
GHashTable*
-g_hash_table_new (GHashFunc hash_func,
- GCompareFunc key_compare_func)
+g_hash_table_new_full (GHashFunc hash_func,
+ GEqualFunc key_equal_func,
+ GDestroyNotify key_destroy_func,
+ GDestroyNotify value_destroy_func)
{
GHashTable *hash_table;
- guint i;
-
- hash_table = g_new (GHashTable, 1);
- hash_table->size = HASH_TABLE_MIN_SIZE;
- hash_table->nnodes = 0;
- hash_table->frozen = FALSE;
- hash_table->hash_func = hash_func ? hash_func : g_direct_hash;
- hash_table->key_compare_func = key_compare_func;
- hash_table->nodes = g_new (GHashNode*, hash_table->size);
-
- for (i = 0; i < hash_table->size; i++)
- hash_table->nodes[i] = NULL;
-
+
+ hash_table = g_slice_new (GHashTable);
+ hash_table->size = HASH_TABLE_MIN_SIZE;
+ hash_table->nnodes = 0;
+ hash_table->hash_func = hash_func ? hash_func : g_direct_hash;
+ hash_table->key_equal_func = key_equal_func;
+ hash_table->ref_count = 1;
+ hash_table->key_destroy_func = key_destroy_func;
+ hash_table->value_destroy_func = value_destroy_func;
+ hash_table->nodes = g_new0 (GHashNode*, hash_table->size);
+
return hash_table;
}
+
+/**
+ * g_hash_table_ref:
+ * @hash_table: a valid #GHashTable.
+ *
+ * Atomically increments the reference count of @hash_table by one.
+ * This function is MT-safe and may be called from any thread.
+ *
+ * Return value: the passed in #GHashTable.
+ *
+ * Since: 2.10
+ **/
+GHashTable*
+g_hash_table_ref (GHashTable *hash_table)
+{
+ g_return_val_if_fail (hash_table != NULL, NULL);
+ g_return_val_if_fail (hash_table->ref_count > 0, hash_table);
+
+ g_atomic_int_add (&hash_table->ref_count, 1);
+ return hash_table;
+}
+
+/**
+ * g_hash_table_unref:
+ * @hash_table: a valid #GHashTable.
+ *
+ * Atomically decrements the reference count of @hash_table by one.
+ * If the reference count drops to 0, all keys and values will be
+ * destroyed, and all memory allocated by the hash table is released.
+ * This function is MT-safe and may be called from any thread.
+ *
+ * Since: 2.10
+ **/
+void
+g_hash_table_unref (GHashTable *hash_table)
+{
+ g_return_if_fail (hash_table != NULL);
+ g_return_if_fail (hash_table->ref_count > 0);
+
+ if (g_atomic_int_exchange_and_add (&hash_table->ref_count, -1) - 1 == 0)
+ {
+ g_hash_table_remove_all_nodes (hash_table, FALSE);
+ g_free (hash_table->nodes);
+ g_slice_free (GHashTable, hash_table);
+ }
+}
+
+/**
+ * g_hash_table_destroy:
+ * @hash_table: a #GHashTable.
+ *
+ * Destroys all keys and values in the #GHashTable and decrements its
+ * reference count by 1. If keys and/or values are dynamically allocated,
+ * you should either free them first or create the #GHashTable with destroy
+ * notifiers using g_hash_table_new_full(). In the latter case the destroy
+ * functions you supplied will be called on all keys and values during the
+ * destruction phase.
+ **/
void
g_hash_table_destroy (GHashTable *hash_table)
{
- guint i;
-
g_return_if_fail (hash_table != NULL);
-
- for (i = 0; i < hash_table->size; i++)
- g_hash_nodes_destroy (hash_table->nodes[i]);
-
- g_free (hash_table->nodes);
- g_free (hash_table);
+ g_return_if_fail (hash_table->ref_count > 0);
+
+ g_hash_table_remove_all (hash_table);
+ g_hash_table_unref (hash_table);
}
-static inline GHashNode**
-g_hash_table_lookup_node (GHashTable *hash_table,
- gconstpointer key)
+static inline GHashNode **
+g_hash_table_lookup_node (GHashTable *hash_table,
+ gconstpointer key,
+ guint *hash_return)
{
- GHashNode **node;
-
- node = &hash_table->nodes
- [(* hash_table->hash_func) (key) % hash_table->size];
-
+ GHashNode **node_ptr, *node;
+ guint hash_value;
+
+ hash_value = (* hash_table->hash_func) (key);
+ node_ptr = &hash_table->nodes[hash_value % hash_table->size];
+
+ if (hash_return)
+ *hash_return = hash_value;
+
/* Hash table lookup needs to be fast.
* We therefore remove the extra conditional of testing
- * whether to call the key_compare_func or not from
+ * whether to call the key_equal_func or not from
* the inner loop.
+ *
+ * Additional optimisation: first check if our full hash
+ * values are equal so we can avoid calling the full-blown
+ * key equality function in most cases.
*/
- if (hash_table->key_compare_func)
- while (*node && !(*hash_table->key_compare_func) ((*node)->key, key))
- node = &(*node)->next;
+ if (hash_table->key_equal_func)
+ {
+ while ((node = *node_ptr))
+ {
+ if (node->key_hash == hash_value &&
+ hash_table->key_equal_func (node->key, key))
+ break;
+
+ node_ptr = &(*node_ptr)->next;
+ }
+ }
else
- while (*node && (*node)->key != key)
- node = &(*node)->next;
-
- return node;
+ {
+ while ((node = *node_ptr))
+ {
+ if (node->key == key)
+ break;
+
+ node_ptr = &(*node_ptr)->next;
+ }
+ }
+
+ return node_ptr;
}
+/**
+ * g_hash_table_lookup:
+ * @hash_table: a #GHashTable.
+ * @key: the key to look up.
+ *
+ * Looks up a key in a #GHashTable. Note that this function cannot
+ * distinguish between a key that is not present and one which is present
+ * and has the value %NULL. If you need this distinction, use
+ * g_hash_table_lookup_extended().
+ *
+ * Return value: the associated value, or %NULL if the key is not found.
+ **/
gpointer
-g_hash_table_lookup (GHashTable *hash_table,
- gconstpointer key)
+g_hash_table_lookup (GHashTable *hash_table,
+ gconstpointer key)
{
GHashNode *node;
-
+
g_return_val_if_fail (hash_table != NULL, NULL);
-
- node = *g_hash_table_lookup_node (hash_table, key);
-
+
+ node = *g_hash_table_lookup_node (hash_table, key, NULL);
+
return node ? node->value : NULL;
}
-void
-g_hash_table_insert (GHashTable *hash_table,
- gpointer key,
- gpointer value)
+/**
+ * g_hash_table_lookup_extended:
+ * @hash_table: a #GHashTable.
+ * @lookup_key: the key to look up.
+ * @orig_key: returns the original key.
+ * @value: returns the value associated with the key.
+ *
+ * Looks up a key in the #GHashTable, returning the original key and the
+ * associated value and a #gboolean which is %TRUE if the key was found. This
+ * is useful if you need to free the memory allocated for the original key,
+ * for example before calling g_hash_table_remove().
+ *
+ * Return value: %TRUE if the key was found in the #GHashTable.
+ **/
+gboolean
+g_hash_table_lookup_extended (GHashTable *hash_table,
+ gconstpointer lookup_key,
+ gpointer *orig_key,
+ gpointer *value)
+{
+ GHashNode *node;
+
+ g_return_val_if_fail (hash_table != NULL, FALSE);
+
+ node = *g_hash_table_lookup_node (hash_table, lookup_key, NULL);
+
+ if (node == NULL)
+ return FALSE;
+
+ if (orig_key)
+ *orig_key = node->key;
+
+ if (value)
+ *value = node->value;
+
+ return TRUE;
+}
+
+static void
+g_hash_table_insert_internal (GHashTable *hash_table,
+ gpointer key,
+ gpointer value,
+ gboolean keep_new_key)
{
- GHashNode **node;
-
+ GHashNode **node_ptr, *node;
+ guint key_hash;
+
g_return_if_fail (hash_table != NULL);
-
- node = g_hash_table_lookup_node (hash_table, key);
-
- if (*node)
+ g_return_if_fail (hash_table->ref_count > 0);
+
+ node_ptr = g_hash_table_lookup_node (hash_table, key, &key_hash);
+
+ if ((node = *node_ptr))
{
- /* do not reset node->key in this place, keeping
- * the old key might be intended.
- * a g_hash_table_remove/g_hash_table_insert pair
- * can be used otherwise.
- *
- * node->key = key; */
- (*node)->value = value;
+ if (keep_new_key)
+ {
+ if (hash_table->key_destroy_func)
+ hash_table->key_destroy_func (node->key);
+ node->key = key;
+ }
+ else
+ {
+ if (hash_table->key_destroy_func)
+ hash_table->key_destroy_func (key);
+ }
+
+ if (hash_table->value_destroy_func)
+ hash_table->value_destroy_func (node->value);
+
+ node->value = value;
}
else
{
- *node = g_hash_node_new (key, value);
+ node = g_slice_new (GHashNode);
+
+ node->key = key;
+ node->value = value;
+ node->key_hash = key_hash;
+ node->next = NULL;
+
+ *node_ptr = node;
hash_table->nnodes++;
- if (!hash_table->frozen)
- g_hash_table_resize (hash_table);
+ g_hash_table_maybe_resize (hash_table);
}
}
+/**
+ * g_hash_table_insert:
+ * @hash_table: a #GHashTable.
+ * @key: a key to insert.
+ * @value: the value to associate with the key.
+ *
+ * Inserts a new key and value into a #GHashTable.
+ *
+ * If the key already exists in the #GHashTable its current value is replaced
+ * with the new value. If you supplied a @value_destroy_func when creating the
+ * #GHashTable, the old value is freed using that function. If you supplied
+ * a @key_destroy_func when creating the #GHashTable, the passed key is freed
+ * using that function.
+ **/
void
-g_hash_table_remove (GHashTable *hash_table,
- gconstpointer key)
+g_hash_table_insert (GHashTable *hash_table,
+ gpointer key,
+ gpointer value)
{
- GHashNode **node, *dest;
-
- g_return_if_fail (hash_table != NULL);
-
- while (*(node = g_hash_table_lookup_node (hash_table, key)))
- {
- dest = *node;
- (*node) = dest->next;
- g_hash_node_destroy (dest);
- hash_table->nnodes--;
- }
-
- if (!hash_table->frozen)
- g_hash_table_resize (hash_table);
+ return g_hash_table_insert_internal (hash_table, key, value, FALSE);
}
-gboolean
-g_hash_table_lookup_extended (GHashTable *hash_table,
- gconstpointer lookup_key,
- gpointer *orig_key,
- gpointer *value)
+/**
+ * g_hash_table_replace:
+ * @hash_table: a #GHashTable.
+ * @key: a key to insert.
+ * @value: the value to associate with the key.
+ *
+ * Inserts a new key and value into a #GHashTable similar to
+ * g_hash_table_insert(). The difference is that if the key already exists
+ * in the #GHashTable, it gets replaced by the new key. If you supplied a
+ * @value_destroy_func when creating the #GHashTable, the old value is freed
+ * using that function. If you supplied a @key_destroy_func when creating the
+ * #GHashTable, the old key is freed using that function.
+ **/
+void
+g_hash_table_replace (GHashTable *hash_table,
+ gpointer key,
+ gpointer value)
{
- GHashNode *node;
-
+ return g_hash_table_insert_internal (hash_table, key, value, TRUE);
+}
+
+static void
+g_hash_table_remove_node (GHashTable *hash_table,
+ GHashNode ***node_ptr_ptr,
+ gboolean notify)
+{
+ GHashNode **node_ptr, *node;
+
+ node_ptr = *node_ptr_ptr;
+ node = *node_ptr;
+
+ *node_ptr = node->next;
+
+ if (notify && hash_table->key_destroy_func)
+ hash_table->key_destroy_func (node->key);
+
+ if (notify && hash_table->value_destroy_func)
+ hash_table->value_destroy_func (node->value);
+
+ g_slice_free (GHashNode, node);
+
+ hash_table->nnodes--;
+}
+
+static void
+g_hash_table_remove_all_nodes (GHashTable *hash_table,
+ gboolean notify)
+{
+ GHashNode **node_ptr;
+ int i;
+
+ for (i = 0; i < hash_table->size; i++)
+ for (node_ptr = &hash_table->nodes[i]; *node_ptr != NULL;)
+ g_hash_table_remove_node (hash_table, &node_ptr, notify);
+
+ hash_table->nnodes = 0;
+}
+
+static gboolean
+g_hash_table_remove_internal (GHashTable *hash_table,
+ gconstpointer key,
+ gboolean notify)
+{
+ GHashNode **node_ptr;
+
g_return_val_if_fail (hash_table != NULL, FALSE);
-
- node = *g_hash_table_lookup_node (hash_table, lookup_key);
-
- if (node)
- {
- if (orig_key)
- *orig_key = node->key;
- if (value)
- *value = node->value;
- return TRUE;
- }
- else
+
+ node_ptr = g_hash_table_lookup_node (hash_table, key, NULL);
+ if (*node_ptr == NULL)
return FALSE;
+
+ g_hash_table_remove_node (hash_table, &node_ptr, notify);
+ g_hash_table_maybe_resize (hash_table);
+
+ return TRUE;
}
+/**
+ * g_hash_table_remove:
+ * @hash_table: a #GHashTable.
+ * @key: the key to remove.
+ *
+ * Removes a key and its associated value from a #GHashTable.
+ *
+ * If the #GHashTable was created using g_hash_table_new_full(), the
+ * key and value are freed using the supplied destroy functions, otherwise
+ * you have to make sure that any dynamically allocated values are freed
+ * yourself.
+ *
+ * Return value: %TRUE if the key was found and removed from the #GHashTable.
+ **/
+gboolean
+g_hash_table_remove (GHashTable *hash_table,
+ gconstpointer key)
+{
+ return g_hash_table_remove_internal (hash_table, key, TRUE);
+}
+
+/**
+ * g_hash_table_remove_all:
+ * @hash_table: a #GHashTable
+ *
+ * Removes all keys and their associated values from a #GHashTable.
+ *
+ * If the #GHashTable was created using g_hash_table_new_full(), the keys
+ * and values are freed using the supplied destroy functions, otherwise you
+ * have to make sure that any dynamically allocated values are freed
+ * yourself.
+ *
+ * Since: 2.12
+ **/
void
-g_hash_table_freeze (GHashTable *hash_table)
+g_hash_table_remove_all (GHashTable *hash_table)
{
g_return_if_fail (hash_table != NULL);
-
- hash_table->frozen++;
+
+ g_hash_table_remove_all_nodes (hash_table, TRUE);
+ g_hash_table_maybe_resize (hash_table);
+}
+
+/**
+ * g_hash_table_steal:
+ * @hash_table: a #GHashTable.
+ * @key: the key to remove.
+ *
+ * Removes a key and its associated value from a #GHashTable without
+ * calling the key and value destroy functions.
+ *
+ * Return value: %TRUE if the key was found and removed from the #GHashTable.
+ **/
+gboolean
+g_hash_table_steal (GHashTable *hash_table,
+ gconstpointer key)
+{
+ return g_hash_table_remove_internal (hash_table, key, FALSE);
}
+/**
+ * g_hash_table_steal_all:
+ * @hash_table: a #GHashTable.
+ *
+ * Removes all keys and their associated values from a #GHashTable
+ * without calling the key and value destroy functions.
+ *
+ * Since: 2.12
+ **/
void
-g_hash_table_thaw (GHashTable *hash_table)
+g_hash_table_steal_all (GHashTable *hash_table)
{
g_return_if_fail (hash_table != NULL);
-
- if (hash_table->frozen)
- if (!(--hash_table->frozen))
- g_hash_table_resize (hash_table);
+
+ g_hash_table_remove_all_nodes (hash_table, FALSE);
+ g_hash_table_maybe_resize (hash_table);
+}
+
+/**
+ * g_hash_table_foreach_remove:
+ * @hash_table: a #GHashTable.
+ * @func: the function to call for each key/value pair.
+ * @user_data: user data to pass to the function.
+ *
+ * Calls the given function for each key/value pair in the #GHashTable.
+ * If the function returns %TRUE, then the key/value pair is removed from the
+ * #GHashTable. If you supplied key or value destroy functions when creating
+ * the #GHashTable, they are used to free the memory allocated for the removed
+ * keys and values.
+ *
+ * Return value: the number of key/value pairs removed.
+ **/
+guint
+g_hash_table_foreach_remove (GHashTable *hash_table,
+ GHRFunc func,
+ gpointer user_data)
+{
+ g_return_val_if_fail (hash_table != NULL, 0);
+ g_return_val_if_fail (func != NULL, 0);
+
+ return g_hash_table_foreach_remove_or_steal (hash_table, func, user_data, TRUE);
}
-gint
-g_hash_table_foreach_remove (GHashTable *hash_table,
- GHRFunc func,
- gpointer user_data)
+/**
+ * g_hash_table_foreach_steal:
+ * @hash_table: a #GHashTable.
+ * @func: the function to call for each key/value pair.
+ * @user_data: user data to pass to the function.
+ *
+ * Calls the given function for each key/value pair in the #GHashTable.
+ * If the function returns %TRUE, then the key/value pair is removed from the
+ * #GHashTable, but no key or value destroy functions are called.
+ *
+ * Return value: the number of key/value pairs removed.
+ **/
+guint
+g_hash_table_foreach_steal (GHashTable *hash_table,
+ GHRFunc func,
+ gpointer user_data)
{
- GHashNode *node, *prev;
- guint i;
- gint deleted = 0;
-
g_return_val_if_fail (hash_table != NULL, 0);
g_return_val_if_fail (func != NULL, 0);
-
+
+ return g_hash_table_foreach_remove_or_steal (hash_table, func, user_data, FALSE);
+}
+
+static guint
+g_hash_table_foreach_remove_or_steal (GHashTable *hash_table,
+ GHRFunc func,
+ gpointer user_data,
+ gboolean notify)
+{
+ GHashNode *node, **node_ptr;
+ guint deleted = 0;
+ gint i;
+
for (i = 0; i < hash_table->size; i++)
- {
- restart:
-
- prev = NULL;
-
- for (node = hash_table->nodes[i]; node; prev = node, node = node->next)
- {
- if ((* func) (node->key, node->value, user_data))
- {
- deleted += 1;
-
- hash_table->nnodes -= 1;
-
- if (prev)
- {
- prev->next = node->next;
- g_hash_node_destroy (node);
- node = prev;
- }
- else
- {
- hash_table->nodes[i] = node->next;
- g_hash_node_destroy (node);
- goto restart;
- }
- }
- }
- }
-
- if (!hash_table->frozen)
- g_hash_table_resize (hash_table);
-
+ for (node_ptr = &hash_table->nodes[i]; (node = *node_ptr) != NULL;)
+ if ((* func) (node->key, node->value, user_data))
+ {
+ g_hash_table_remove_node (hash_table, &node_ptr, notify);
+ deleted++;
+ }
+ else
+ node_ptr = &node->next;
+
+ g_hash_table_maybe_resize (hash_table);
+
return deleted;
}
+/**
+ * g_hash_table_foreach:
+ * @hash_table: a #GHashTable.
+ * @func: the function to call for each key/value pair.
+ * @user_data: user data to pass to the function.
+ *
+ * Calls the given function for each of the key/value pairs in the
+ * #GHashTable. The function is passed the key and value of each
+ * pair, and the given @user_data parameter. The hash table may not
+ * be modified while iterating over it (you can't add/remove
+ * items). To remove all items matching a predicate, use
+ * g_hash_table_foreach_remove().
+ *
+ * See g_hash_table_find() for performance caveats for linear
+ * order searches in contrast to g_hash_table_lookup().
+ **/
void
g_hash_table_foreach (GHashTable *hash_table,
- GHFunc func,
- gpointer user_data)
+ GHFunc func,
+ gpointer user_data)
{
GHashNode *node;
gint i;
-
+
g_return_if_fail (hash_table != NULL);
g_return_if_fail (func != NULL);
-
+
for (i = 0; i < hash_table->size; i++)
for (node = hash_table->nodes[i]; node; node = node->next)
(* func) (node->key, node->value, user_data);
}
-/* Returns the number of elements contained in the hash table. */
-gint
+/**
+ * g_hash_table_find:
+ * @hash_table: a #GHashTable.
+ * @predicate: function to test the key/value pairs for a certain property.
+ * @user_data: user data to pass to the function.
+ *
+ * Calls the given function for key/value pairs in the #GHashTable until
+ * @predicate returns %TRUE. The function is passed the key and value of
+ * each pair, and the given @user_data parameter. The hash table may not
+ * be modified while iterating over it (you can't add/remove items).
+ *
+ * Note, that hash tables are really only optimized for forward lookups,
+ * i.e. g_hash_table_lookup().
+ * So code that frequently issues g_hash_table_find() or
+ * g_hash_table_foreach() (e.g. in the order of once per every entry in a
+ * hash table) should probably be reworked to use additional or different
+ * data structures for reverse lookups (keep in mind that an O(n) find/foreach
+ * operation issued for all n values in a hash table ends up needing O(n*n)
+ * operations).
+ *
+ * Return value: The value of the first key/value pair is returned, for which
+ * func evaluates to %TRUE. If no pair with the requested property is found,
+ * %NULL is returned.
+ *
+ * Since: 2.4
+ **/
+gpointer
+g_hash_table_find (GHashTable *hash_table,
+ GHRFunc predicate,
+ gpointer user_data)
+{
+ GHashNode *node;
+ gint i;
+
+ g_return_val_if_fail (hash_table != NULL, NULL);
+ g_return_val_if_fail (predicate != NULL, NULL);
+
+ for (i = 0; i < hash_table->size; i++)
+ for (node = hash_table->nodes[i]; node; node = node->next)
+ if (predicate (node->key, node->value, user_data))
+ return node->value;
+ return NULL;
+}
+
+/**
+ * g_hash_table_size:
+ * @hash_table: a #GHashTable.
+ *
+ * Returns the number of elements contained in the #GHashTable.
+ *
+ * Return value: the number of key/value pairs in the #GHashTable.
+ **/
+guint
g_hash_table_size (GHashTable *hash_table)
{
g_return_val_if_fail (hash_table != NULL, 0);
-
+
return hash_table->nnodes;
}
+/**
+ * g_hash_table_get_keys:
+ * @hash_table: a #GHashTable
+ *
+ * Retrieves every key inside @hash_table. The returned data is valid
+ * until @hash_table is modified.
+ *
+ * Return value: a #GList containing all the keys inside the hash
+ * table. The content of the list is owned by the hash table and
+ * should not be modified or freed. Use g_list_free() when done
+ * using the list.
+ *
+ * Since: 2.14
+ */
+GList *
+g_hash_table_get_keys (GHashTable *hash_table)
+{
+ GHashNode *node;
+ gint i;
+ GList *retval;
+
+ g_return_val_if_fail (hash_table != NULL, NULL);
+
+ retval = NULL;
+ for (i = 0; i < hash_table->size; i++)
+ for (node = hash_table->nodes[i]; node; node = node->next)
+ retval = g_list_prepend (retval, node->key);
+
+ return retval;
+}
+
+/**
+ * g_hash_table_get_values:
+ * @hash_table: a #GHashTable
+ *
+ * Retrieves every value inside @hash_table. The returned data is
+ * valid until @hash_table is modified.
+ *
+ * Return value: a #GList containing all the values inside the hash
+ * table. The content of the list is owned by the hash table and
+ * should not be modified or freed. Use g_list_free() when done
+ * using the list.
+ *
+ * Since: 2.14
+ */
+GList *
+g_hash_table_get_values (GHashTable *hash_table)
+{
+ GHashNode *node;
+ gint i;
+ GList *retval;
+
+ g_return_val_if_fail (hash_table != NULL, NULL);
+
+ retval = NULL;
+ for (i = 0; i < hash_table->size; i++)
+ for (node = hash_table->nodes[i]; node; node = node->next)
+ retval = g_list_prepend (retval, node->value);
+
+ return retval;
+}
+
static void
g_hash_table_resize (GHashTable *hash_table)
{
GHashNode **new_nodes;
GHashNode *node;
GHashNode *next;
- gfloat nodes_per_list;
guint hash_val;
gint new_size;
gint i;
-
- nodes_per_list = (gfloat) hash_table->nnodes / (gfloat) hash_table->size;
-
- if ((nodes_per_list > 0.3 || hash_table->size <= HASH_TABLE_MIN_SIZE) &&
- (nodes_per_list < 3.0 || hash_table->size >= HASH_TABLE_MAX_SIZE))
- return;
-
- new_size = CLAMP(g_spaced_primes_closest (hash_table->nnodes),
- HASH_TABLE_MIN_SIZE,
- HASH_TABLE_MAX_SIZE);
- new_nodes = g_new (GHashNode*, new_size);
-
- for (i = 0; i < new_size; i++)
- new_nodes[i] = NULL;
-
+
+ new_size = g_spaced_primes_closest (hash_table->nnodes);
+ new_size = CLAMP (new_size, HASH_TABLE_MIN_SIZE, HASH_TABLE_MAX_SIZE);
+
+ new_nodes = g_new0 (GHashNode*, new_size);
+
for (i = 0; i < hash_table->size; i++)
for (node = hash_table->nodes[i]; node; node = next)
{
next = node->next;
- hash_val = (* hash_table->hash_func) (node->key) % new_size;
+
+ hash_val = node->key_hash % new_size;
+
node->next = new_nodes[hash_val];
new_nodes[hash_val] = node;
}
-
+
g_free (hash_table->nodes);
hash_table->nodes = new_nodes;
hash_table->size = new_size;
}
-static GHashNode*
-g_hash_node_new (gpointer key,
- gpointer value)
-{
- GHashNode *hash_node;
-
- if (node_free_list)
- {
- hash_node = node_free_list;
- node_free_list = node_free_list->next;
- }
- else
- {
- if (!node_mem_chunk)
- node_mem_chunk = g_mem_chunk_new ("hash node mem chunk",
- sizeof (GHashNode),
- 1024, G_ALLOC_ONLY);
-
- hash_node = g_chunk_new (GHashNode, node_mem_chunk);
- }
-
- hash_node->key = key;
- hash_node->value = value;
- hash_node->next = NULL;
-
- return hash_node;
-}
-
-static void
-g_hash_node_destroy (GHashNode *hash_node)
-{
- hash_node->next = node_free_list;
- node_free_list = hash_node;
-}
-
-static void
-g_hash_nodes_destroy (GHashNode *hash_node)
-{
- GHashNode *node;
-
- if (!hash_node)
- return;
-
- node = hash_node;
-
- while (node->next)
- node = node->next;
-
- node->next = node_free_list;
- node_free_list = hash_node;
-}
+#define __G_HASH_C__
+#include "galiasdef.c"
projects / platform / upstream / glib.git / blobdiff