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/* GLIB - Library of useful routines for C programming
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* gdataset.c: Generic dataset mechanism, similar to GtkObject data.
* 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
* 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.
*
* 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.
*/
/*
* Modified by the GLib Team and others 1997-1999. 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 ; FIXME: might still freeze, watch out, not thoroughly
* looked at yet.
*/
#include <string.h>
#include "glib.h"
/* --- defines --- */
#define G_QUARK_BLOCK_SIZE (512)
#define G_DATA_MEM_CHUNK_PREALLOC (128)
#define G_DATA_CACHE_MAX (512)
#define G_DATASET_MEM_CHUNK_PREALLOC (32)
/* --- structures --- */
typedef struct _GDataset GDataset;
struct _GData
{
GData *next;
GQuark id;
gpointer data;
GDestroyNotify destroy_func;
};
struct _GDataset
{
gconstpointer location;
GData *datalist;
};
/* --- prototypes --- */
static inline GDataset* g_dataset_lookup (gconstpointer dataset_location);
static inline void g_datalist_clear_i (GData **datalist);
static void g_dataset_destroy_internal (GDataset *dataset);
static inline void g_data_set_internal (GData **datalist,
GQuark key_id,
gpointer data,
GDestroyNotify destroy_func,
GDataset *dataset);
static void g_data_initialize (void);
static inline GQuark g_quark_new (gchar *string);
/* --- variables --- */
G_LOCK_DEFINE_STATIC (g_dataset_global);
static GHashTable *g_dataset_location_ht = NULL;
static GDataset *g_dataset_cached = NULL; /* should this be
threadspecific? */
static GMemChunk *g_dataset_mem_chunk = NULL;
static GMemChunk *g_data_mem_chunk = NULL;
static GData *g_data_cache = NULL;
static guint g_data_cache_length = 0;
G_LOCK_DEFINE_STATIC (g_quark_global);
static GHashTable *g_quark_ht = NULL;
static gchar **g_quarks = NULL;
static GQuark g_quark_seq_id = 0;
/* --- functions --- */
/* HOLDS: g_dataset_global_lock */
static inline void
g_datalist_clear_i (GData **datalist)
{
register GData *list;
/* unlink *all* items before walking their destructors
*/
list = *datalist;
*datalist = NULL;
while (list)
{
register GData *prev;
prev = list;
list = prev->next;
if (prev->destroy_func)
{
G_UNLOCK (g_dataset_global);
prev->destroy_func (prev->data);
G_LOCK (g_dataset_global);
}
if (g_data_cache_length < G_DATA_CACHE_MAX)
{
prev->next = g_data_cache;
g_data_cache = prev;
g_data_cache_length++;
}
else
g_mem_chunk_free (g_data_mem_chunk, prev);
}
}
void
g_datalist_clear (GData **datalist)
{
g_return_if_fail (datalist != NULL);
G_LOCK (g_dataset_global);
if (!g_dataset_location_ht)
g_data_initialize ();
while (*datalist)
g_datalist_clear_i (datalist);
G_UNLOCK (g_dataset_global);
}
/* HOLDS: g_dataset_global_lock */
static inline GDataset*
g_dataset_lookup (gconstpointer dataset_location)
{
register GDataset *dataset;
if (g_dataset_cached && g_dataset_cached->location == dataset_location)
return g_dataset_cached;
dataset = g_hash_table_lookup (g_dataset_location_ht, dataset_location);
if (dataset)
g_dataset_cached = dataset;
return dataset;
}
/* HOLDS: g_dataset_global_lock */
static void
g_dataset_destroy_internal (GDataset *dataset)
{
register gconstpointer dataset_location;
dataset_location = dataset->location;
while (dataset)
{
if (!dataset->datalist)
{
if (dataset == g_dataset_cached)
g_dataset_cached = NULL;
g_hash_table_remove (g_dataset_location_ht, dataset_location);
g_mem_chunk_free (g_dataset_mem_chunk, dataset);
break;
}
g_datalist_clear_i (&dataset->datalist);
dataset = g_dataset_lookup (dataset_location);
}
}
void
g_dataset_destroy (gconstpointer dataset_location)
{
g_return_if_fail (dataset_location != NULL);
G_LOCK (g_dataset_global);
if (g_dataset_location_ht)
{
register GDataset *dataset;
dataset = g_dataset_lookup (dataset_location);
if (dataset)
g_dataset_destroy_internal (dataset);
}
G_UNLOCK (g_dataset_global);
}
/* HOLDS: g_dataset_global_lock */
static inline void
g_data_set_internal (GData **datalist,
GQuark key_id,
gpointer data,
GDestroyNotify destroy_func,
GDataset *dataset)
{
register GData *list;
list = *datalist;
if (!data)
{
register GData *prev;
prev = NULL;
while (list)
{
if (list->id == key_id)
{
if (prev)
prev->next = list->next;
else
{
*datalist = list->next;
/* the dataset destruction *must* be done
* prior to invokation of the data destroy function
*/
if (!*datalist && dataset)
g_dataset_destroy_internal (dataset);
}
/* the GData struct *must* already be unlinked
* when invoking the destroy function.
* we use (data==NULL && destroy_func!=NULL) as
* a special hint combination to "steal"
* data without destroy notification
*/
if (list->destroy_func && !destroy_func)
{
G_UNLOCK (g_dataset_global);
list->destroy_func (list->data);
G_LOCK (g_dataset_global);
}
if (g_data_cache_length < G_DATA_CACHE_MAX)
{
list->next = g_data_cache;
g_data_cache = list;
g_data_cache_length++;
}
else
g_mem_chunk_free (g_data_mem_chunk, list);
return;
}
prev = list;
list = list->next;
}
}
else
{
while (list)
{
if (list->id == key_id)
{
if (!list->destroy_func)
{
list->data = data;
list->destroy_func = destroy_func;
}
else
{
register GDestroyNotify dfunc;
register gpointer ddata;
dfunc = list->destroy_func;
ddata = list->data;
list->data = data;
list->destroy_func = destroy_func;
/* we need to have updated all structures prior to
* invokation of the destroy function
*/
G_UNLOCK (g_dataset_global);
dfunc (ddata);
G_LOCK (g_dataset_global);
}
return;
}
list = list->next;
}
if (g_data_cache)
{
list = g_data_cache;
g_data_cache = list->next;
g_data_cache_length--;
}
else
list = g_chunk_new (GData, g_data_mem_chunk);
list->next = *datalist;
list->id = key_id;
list->data = data;
list->destroy_func = destroy_func;
*datalist = list;
}
}
void
g_dataset_id_set_data_full (gconstpointer dataset_location,
GQuark key_id,
gpointer data,
GDestroyNotify destroy_func)
{
register GDataset *dataset;
g_return_if_fail (dataset_location != NULL);
if (!data)
g_return_if_fail (destroy_func == NULL);
if (!key_id)
{
if (data)
g_return_if_fail (key_id > 0);
else
return;
}
G_LOCK (g_dataset_global);
if (!g_dataset_location_ht)
g_data_initialize ();
dataset = g_dataset_lookup (dataset_location);
if (!dataset)
{
dataset = g_chunk_new (GDataset, g_dataset_mem_chunk);
dataset->location = dataset_location;
g_datalist_init (&dataset->datalist);
g_hash_table_insert (g_dataset_location_ht,
(gpointer) dataset->location,
dataset);
}
g_data_set_internal (&dataset->datalist, key_id, data, destroy_func, dataset);
G_UNLOCK (g_dataset_global);
}
void
g_datalist_id_set_data_full (GData **datalist,
GQuark key_id,
gpointer data,
GDestroyNotify destroy_func)
{
g_return_if_fail (datalist != NULL);
if (!data)
g_return_if_fail (destroy_func == NULL);
if (!key_id)
{
if (data)
g_return_if_fail (key_id > 0);
else
return;
}
G_LOCK (g_dataset_global);
if (!g_dataset_location_ht)
g_data_initialize ();
g_data_set_internal (datalist, key_id, data, destroy_func, NULL);
G_UNLOCK (g_dataset_global);
}
void
g_dataset_id_remove_no_notify (gconstpointer dataset_location,
GQuark key_id)
{
g_return_if_fail (dataset_location != NULL);
G_LOCK (g_dataset_global);
if (key_id && g_dataset_location_ht)
{
GDataset *dataset;
dataset = g_dataset_lookup (dataset_location);
if (dataset)
g_data_set_internal (&dataset->datalist, key_id, NULL, (GDestroyNotify) 42, dataset);
}
G_UNLOCK (g_dataset_global);
}
void
g_datalist_id_remove_no_notify (GData **datalist,
GQuark key_id)
{
g_return_if_fail (datalist != NULL);
G_LOCK (g_dataset_global);
if (key_id && g_dataset_location_ht)
g_data_set_internal (datalist, key_id, NULL, (GDestroyNotify) 42, NULL);
G_UNLOCK (g_dataset_global);
}
gpointer
g_dataset_id_get_data (gconstpointer dataset_location,
GQuark key_id)
{
g_return_val_if_fail (dataset_location != NULL, NULL);
G_LOCK (g_dataset_global);
if (key_id && g_dataset_location_ht)
{
register GDataset *dataset;
dataset = g_dataset_lookup (dataset_location);
if (dataset)
{
register GData *list;
for (list = dataset->datalist; list; list = list->next)
if (list->id == key_id)
{
G_UNLOCK (g_dataset_global);
return list->data;
}
}
}
G_UNLOCK (g_dataset_global);
return NULL;
}
gpointer
g_datalist_id_get_data (GData **datalist,
GQuark key_id)
{
g_return_val_if_fail (datalist != NULL, NULL);
if (key_id)
{
register GData *list;
for (list = *datalist; list; list = list->next)
if (list->id == key_id)
return list->data;
}
return NULL;
}
void
g_dataset_foreach (gconstpointer dataset_location,
GDataForeachFunc func,
gpointer user_data)
{
register GDataset *dataset;
g_return_if_fail (dataset_location != NULL);
g_return_if_fail (func != NULL);
G_LOCK (g_dataset_global);
if (g_dataset_location_ht)
{
dataset = g_dataset_lookup (dataset_location);
G_UNLOCK (g_dataset_global);
if (dataset)
{
register GData *list;
for (list = dataset->datalist; list; list = list->next)
func (list->id, list->data, user_data);
}
}
else
{
G_UNLOCK (g_dataset_global);
}
}
void
g_datalist_foreach (GData **datalist,
GDataForeachFunc func,
gpointer user_data)
{
register GData *list;
g_return_if_fail (datalist != NULL);
g_return_if_fail (func != NULL);
for (list = *datalist; list; list = list->next)
func (list->id, list->data, user_data);
}
void
g_datalist_init (GData **datalist)
{
g_return_if_fail (datalist != NULL);
*datalist = NULL;
}
/* HOLDS: g_dataset_global_lock */
static void
g_data_initialize (void)
{
g_return_if_fail (g_dataset_location_ht == NULL);
g_dataset_location_ht = g_hash_table_new (g_direct_hash, NULL);
g_dataset_cached = NULL;
g_dataset_mem_chunk =
g_mem_chunk_new ("GDataset MemChunk",
sizeof (GDataset),
sizeof (GDataset) * G_DATASET_MEM_CHUNK_PREALLOC,
G_ALLOC_AND_FREE);
g_data_mem_chunk =
g_mem_chunk_new ("GData MemChunk",
sizeof (GData),
sizeof (GData) * G_DATA_MEM_CHUNK_PREALLOC,
G_ALLOC_AND_FREE);
}
GQuark
g_quark_try_string (const gchar *string)
{
GQuark quark = 0;
g_return_val_if_fail (string != NULL, 0);
G_LOCK (g_quark_global);
if (g_quark_ht)
quark = GPOINTER_TO_UINT (g_hash_table_lookup (g_quark_ht, string));
G_UNLOCK (g_quark_global);
return quark;
}
GQuark
g_quark_from_string (const gchar *string)
{
GQuark quark;
g_return_val_if_fail (string != NULL, 0);
G_LOCK (g_quark_global);
if (g_quark_ht)
quark = (gulong) g_hash_table_lookup (g_quark_ht, string);
else
{
g_quark_ht = g_hash_table_new (g_str_hash, g_str_equal);
quark = 0;
}
if (!quark)
quark = g_quark_new (g_strdup (string));
G_UNLOCK (g_quark_global);
return quark;
}
GQuark
g_quark_from_static_string (const gchar *string)
{
GQuark quark;
g_return_val_if_fail (string != NULL, 0);
G_LOCK (g_quark_global);
if (g_quark_ht)
quark = (gulong) g_hash_table_lookup (g_quark_ht, string);
else
{
g_quark_ht = g_hash_table_new (g_str_hash, g_str_equal);
quark = 0;
}
if (!quark)
quark = g_quark_new ((gchar*) string);
G_UNLOCK (g_quark_global);
return quark;
}
gchar*
g_quark_to_string (GQuark quark)
{
gchar* result = NULL;
G_LOCK (g_quark_global);
if (quark > 0 && quark <= g_quark_seq_id)
result = g_quarks[quark - 1];
G_UNLOCK (g_quark_global);
return result;
}
/* HOLDS: g_quark_global_lock */
static inline GQuark
g_quark_new (gchar *string)
{
GQuark quark;
if (g_quark_seq_id % G_QUARK_BLOCK_SIZE == 0)
g_quarks = g_renew (gchar*, g_quarks, g_quark_seq_id + G_QUARK_BLOCK_SIZE);
g_quarks[g_quark_seq_id] = string;
g_quark_seq_id++;
quark = g_quark_seq_id;
g_hash_table_insert (g_quark_ht, string, GUINT_TO_POINTER (quark));
return quark;
}
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