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-rw-r--r--src/list.h91
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diff --git a/src/list.h b/src/list.h
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+/*
+ * Copyright 2019-2021 OARC, Inc.
+ * Copyright 2017-2018 Akamai Technologies
+ * Copyright 2006-2016 Nominum, Inc.
+ * All rights reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef PERF_LIST_H
+#define PERF_LIST_H 1
+
+#include <assert.h>
+
+#define perf_link(type) \
+ struct { \
+ type *prev, *next; \
+ } _link
+#define perf_link_init(link) \
+ { \
+ (link)->_link.prev = 0; \
+ (link)->_link.next = 0; \
+ }
+
+#define perf_list(type) \
+ struct { \
+ type *head, *tail; \
+ }
+#define perf_list_init(list) \
+ { \
+ (list).head = 0; \
+ (list).tail = 0; \
+ }
+
+#define perf_list_head(list) ((list).head)
+#define perf_list_tail(list) ((list).tail)
+#define perf_list_empty(list) (!(list).head)
+
+#define perf_list_append(list, link) \
+ { \
+ if ((list).tail) { \
+ (list).tail->_link.next = (link); \
+ } else { \
+ (list).head = (link); \
+ } \
+ (link)->_link.prev = (list).tail; \
+ (link)->_link.next = 0; \
+ (list).tail = (link); \
+ }
+#define perf_list_prepend(list, link) \
+ { \
+ if ((list).head) { \
+ (list).head->_link.prev = (link); \
+ } else { \
+ (list).tail = (link); \
+ } \
+ (link)->_link.prev = 0; \
+ (link)->_link.next = (list).head; \
+ (list).head = (link); \
+ }
+#define perf_list_unlink(list, link) \
+ { \
+ if ((link)->_link.next) { \
+ (link)->_link.next->_link.prev = (link)->_link.prev; \
+ } else { \
+ assert((list).tail == (link)); \
+ (list).tail = (link)->_link.prev; \
+ } \
+ if ((link)->_link.prev) { \
+ (link)->_link.prev->_link.next = (link)->_link.next; \
+ } else { \
+ assert((list).head == (link)); \
+ (list).head = (link)->_link.next; \
+ } \
+ (link)->_link.next = 0; \
+ (link)->_link.prev = 0; \
+ assert((list).head != (link)); \
+ assert((list).tail != (link)); \
+ }
+
+#endif