/* 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

 * Portions copyright (c) 2006-2009 Nokia Corporation.  All rights reserved.

 *

 * This library is free software; you can redistribute it and/or

 * 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

 * Lesser General Public License for more details.

 *

 * 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 ; except for g_data*_foreach()

 */

#include "config.h"

#include <string.h>

#include "glib.h"

#include "gdatasetprivate.h"

#include "galias.h"

#ifdef __SYMBIAN32__

#include "glib_wsd.h"

#endif /* __SYMBIAN32__ */

#if EMULATOR

#define g_thread_functions_for_glib_use (*_g_thread_functions_for_glib_use())

#define g_thread_use_default_impl (*_g_thread_use_default_impl())

#endif /* EMULATOR */

/* --- defines --- */

#define	G_QUARK_BLOCK_SIZE			(512)

/* datalist pointer accesses have to be carried out atomically */

#define G_DATALIST_GET_POINTER(datalist)						\

  ((GData*) ((gsize) g_atomic_pointer_get (datalist) & ~(gsize) G_DATALIST_FLAGS_MASK))

#define G_DATALIST_SET_POINTER(datalist, pointer)       G_STMT_START {                  \

  gpointer _oldv, _newv;                                                                \

  do {                                                                                  \

    _oldv = g_atomic_pointer_get (datalist);                                            \

    _newv = (gpointer) (((gsize) _oldv & G_DATALIST_FLAGS_MASK) | (gsize) pointer);     \

  } while (!g_atomic_pointer_compare_and_exchange ((void**) datalist, _oldv, _newv));   \

} G_STMT_END

/* --- 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 gpointer	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 --- */

#if EMULATOR

PLS_MACRO(g_dataset_global,gdataset,GStaticMutex)

PLS(g_dataset_location_ht,gdataset,GHashTable *)

PLS(g_dataset_cached,gdataset,GDataset *)

PLS_MACRO(g_quark_global,gdataset,GStaticMutex)

PLS(g_quark_ht,gdataset,GHashTable *)

PLS(g_quarks,gdataset,gchar **)

PLS(g_quark_seq_id,gdataset,GQuark)

#define g__g_dataset_global_lock (*FUNCTION_NAME_MACRO(g_dataset_global,gdataset)())

#define g_dataset_location_ht (*FUNCTION_NAME(g_dataset_location_ht,gdataset)())

#define g_dataset_cached (*FUNCTION_NAME(g_dataset_cached,gdataset)())

#define g__g_quark_global_lock (*FUNCTION_NAME_MACRO(g_quark_global,gdataset)())

#define g_quark_ht (*FUNCTION_NAME(g_quark_ht,gdataset)())

#define g_quarks (*FUNCTION_NAME(g_quarks,gdataset)())

#define g_quark_seq_id (*FUNCTION_NAME(g_quark_seq_id,gdataset)())

#else

G_LOCK_DEFINE_STATIC (g_dataset_global);

static GHashTable   *g_dataset_location_ht = NULL;

static GDataset     *g_dataset_cached = NULL; /* should this be

						 threadspecific? */

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;

#endif /* EMULATOR */

/* --- 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 = G_DATALIST_GET_POINTER (datalist);

  G_DATALIST_SET_POINTER (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);

	}

      g_slice_free (GData, prev);

    }

}

EXPORT_C 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 (G_DATALIST_GET_POINTER (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_slice_free (GDataset, dataset);

	  break;

	}

      g_datalist_clear_i (&dataset->datalist);

      dataset = g_dataset_lookup (dataset_location);

    }

}

EXPORT_C 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 gpointer

g_data_set_internal (GData	  **datalist,

		     GQuark         key_id,

		     gpointer       data,

		     GDestroyNotify destroy_func,

		     GDataset	   *dataset)

{

  register GData *list;

  list = G_DATALIST_GET_POINTER (datalist);

  if (!data)

    {

      register GData *prev;

      prev = NULL;

      while (list)

	{

	  if (list->id == key_id)

	    {

	      gpointer ret_data = NULL;

	      if (prev)

		prev->next = list->next;

	      else

		{

		  G_DATALIST_SET_POINTER (datalist, list->next);

		  /* the dataset destruction *must* be done

		   * prior to invocation of the data destroy function

		   */

		  if (!list->next && 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);

		}

	      else

		ret_data = list->data;

              g_slice_free (GData, list);

	      return ret_data;

	    }

	  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

		   * invocation of the destroy function

		   */

		  G_UNLOCK (g_dataset_global);

		  dfunc (ddata);

		  G_LOCK (g_dataset_global);

		}

	      return NULL;

	    }

	  list = list->next;

	}

      list = g_slice_new (GData);

      list->next = G_DATALIST_GET_POINTER (datalist);

      list->id = key_id;

      list->data = data;

      list->destroy_func = destroy_func;

      G_DATALIST_SET_POINTER (datalist, list);

    }

  return NULL;

}

EXPORT_C 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_slice_new (GDataset);

      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);

}

EXPORT_C 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);

}

EXPORT_C gpointer

g_dataset_id_remove_no_notify (gconstpointer  dataset_location,

			       GQuark         key_id)

{

  gpointer ret_data = NULL;

  g_return_val_if_fail (dataset_location != NULL, NULL);

  G_LOCK (g_dataset_global);

  if (key_id && g_dataset_location_ht)

    {

      GDataset *dataset;

      dataset = g_dataset_lookup (dataset_location);

      if (dataset)

	ret_data = g_data_set_internal (&dataset->datalist, key_id, NULL, (GDestroyNotify) 42, dataset);

    } 

  G_UNLOCK (g_dataset_global);

  return ret_data;

}

EXPORT_C gpointer

g_datalist_id_remove_no_notify (GData	**datalist,

				GQuark    key_id)

{

  gpointer ret_data = NULL;

  g_return_val_if_fail (datalist != NULL, NULL);

  G_LOCK (g_dataset_global);

  if (key_id && g_dataset_location_ht)

    ret_data = g_data_set_internal (datalist, key_id, NULL, (GDestroyNotify) 42, NULL);

  G_UNLOCK (g_dataset_global);

  return ret_data;

}

EXPORT_C 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;

}

EXPORT_C gpointer

g_datalist_id_get_data (GData	 **datalist,

			GQuark     key_id)

{

  gpointer data = NULL;

  g_return_val_if_fail (datalist != NULL, NULL);

  if (key_id)

    {

      register GData *list;

      G_LOCK (g_dataset_global);

      for (list = G_DATALIST_GET_POINTER (datalist); list; list = list->next)

	if (list->id == key_id)

	  {

            data = list->data;

            break;

          }

      G_UNLOCK (g_dataset_global);

    }

  return data;

}

EXPORT_C 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, *next;

	  for (list = dataset->datalist; list; list = next)

	    {

	      next = list->next;

	      func (list->id, list->data, user_data);

	    }

	}

    }

  else

    {

      G_UNLOCK (g_dataset_global);

    }

}

EXPORT_C void

g_datalist_foreach (GData	   **datalist,

		    GDataForeachFunc func,

		    gpointer         user_data)

{

  register GData *list, *next;

  g_return_if_fail (datalist != NULL);

  g_return_if_fail (func != NULL);

  for (list = G_DATALIST_GET_POINTER (datalist); list; list = next)

    {

      next = list->next;

      func (list->id, list->data, user_data);

    }

}