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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimp-atomic.c
* Copyright (C) 2018 Ell
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gdk-pixbuf/gdk-pixbuf.h>
#include <gegl.h>
#include "core-types.h"
#include "gimp-atomic.h"
/* GSList */
static GSList gimp_atomic_slist_sentinel;
void
gimp_atomic_slist_push_head (GSList * volatile *list,
gpointer data)
{
GSList *old_head;
GSList *new_head;
g_return_if_fail (list != NULL);
new_head = g_slist_alloc ();
new_head->data = data;
do
{
do
{
old_head = g_atomic_pointer_get (list);
}
while (old_head == &gimp_atomic_slist_sentinel);
new_head->next = old_head;
}
while (! g_atomic_pointer_compare_and_exchange (list, old_head, new_head));
}
gpointer
gimp_atomic_slist_pop_head (GSList * volatile *list)
{
GSList *old_head;
GSList *new_head;
gpointer data;
g_return_val_if_fail (list != NULL, NULL);
do
{
do
{
old_head = g_atomic_pointer_get (list);
}
while (old_head == &gimp_atomic_slist_sentinel);
if (! old_head)
return NULL;
}
while (! g_atomic_pointer_compare_and_exchange (list,
old_head,
&gimp_atomic_slist_sentinel));
new_head = old_head->next;
data = old_head->data;
g_atomic_pointer_set (list, new_head);
g_slist_free1 (old_head);
return data;
}
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