init

unitree_SDK/include/dds/ddsrt/circlist.h

@@ -0,0 +1,43 @@
+/*
+ * Copyright(c) 2006 to 2020 ZettaScale Technology and others
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v. 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-2.0, or the Eclipse Distribution License
+ * v. 1.0 which is available at
+ * http://www.eclipse.org/org/documents/edl-v10.php.
+ *
+ * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
+ */
+#ifndef DDSRT_CIRCLIST_H
+#define DDSRT_CIRCLIST_H
+
+/* Circular doubly linked list implementation */
+
+#include <stdbool.h>
+#include <stdint.h>
+#include "dds/export.h"
+
+#if defined (__cplusplus)
+extern "C" {
+#endif
+
+#define DDSRT_FROM_CIRCLIST(typ_, member_, cle_) ((typ_ *) ((char *) (cle_) - offsetof (typ_, member_)))
+
+struct ddsrt_circlist {
+  struct ddsrt_circlist_elem *latest; /* pointer to latest inserted element */
+};
+
+struct ddsrt_circlist_elem {
+  struct ddsrt_circlist_elem *next;
+  struct ddsrt_circlist_elem *prev;
+};
+
+DDS_EXPORT void ddsrt_circlist_init (struct ddsrt_circlist *list);
+DDS_EXPORT bool ddsrt_circlist_isempty (const struct ddsrt_circlist *list);
+DDS_EXPORT void ddsrt_circlist_append (struct ddsrt_circlist *list, struct ddsrt_circlist_elem *elem);
+DDS_EXPORT void ddsrt_circlist_remove (struct ddsrt_circlist *list, struct ddsrt_circlist_elem *elem);
+DDS_EXPORT struct ddsrt_circlist_elem *ddsrt_circlist_oldest (const struct ddsrt_circlist *list);
+DDS_EXPORT struct ddsrt_circlist_elem *ddsrt_circlist_latest (const struct ddsrt_circlist *list);
+
+#endif /* DDSRT_CIRCLIST_H */