100 lines
2.4 KiB
C
100 lines
2.4 KiB
C
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/* PIKA - Photo and Image Kooker Application
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* a rebranding of The GNU Image Manipulation Program (created with heckimp)
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* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
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*
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* Original copyright, applying to most contents (license remains unchanged):
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* pika-atomic.c
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* Copyright (C) 2018 Ell
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <gdk-pixbuf/gdk-pixbuf.h>
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#include <gegl.h>
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#include "core-types.h"
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#include "pika-atomic.h"
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/* GSList */
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static GSList pika_atomic_slist_sentinel;
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void
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pika_atomic_slist_push_head (GSList **list,
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gpointer data)
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{
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GSList *old_head;
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GSList *new_head;
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g_return_if_fail (list != NULL);
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new_head = g_slist_alloc ();
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new_head->data = data;
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do
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{
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do
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{
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old_head = g_atomic_pointer_get (list);
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}
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while (old_head == &pika_atomic_slist_sentinel);
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new_head->next = old_head;
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}
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while (! g_atomic_pointer_compare_and_exchange (list, old_head, new_head));
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}
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gpointer
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pika_atomic_slist_pop_head (GSList **list)
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{
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GSList *old_head;
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GSList *new_head;
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gpointer data;
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g_return_val_if_fail (list != NULL, NULL);
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do
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{
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do
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{
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old_head = g_atomic_pointer_get (list);
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}
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while (old_head == &pika_atomic_slist_sentinel);
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if (! old_head)
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return NULL;
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}
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while (! g_atomic_pointer_compare_and_exchange (list,
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old_head,
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&pika_atomic_slist_sentinel));
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new_head = old_head->next;
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data = old_head->data;
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g_atomic_pointer_set (list, new_head);
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g_slist_free1 (old_head);
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return data;
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}
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