1 files changed, 45 insertions, 0 deletions
diff --git a/include/haproxy/xref-t.h b/include/haproxy/xref-t.h
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+++ b/include/haproxy/xref-t.h
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+/*
+ * include/haproxy/xref-t.h
+ * Atomic cross-references between two elements - types
+ *
+ * Copyright (C) 2017 Thierry Fournier <thierry.fournier@ozon.io>
+ * Copyright (C) 2020 Willy Tarreau - w@1wt.eu
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+#ifndef __HAPROXY_XREF_T_H__
+#define __HAPROXY_XREF_T_H__
+
+/* xref is used to create relation between two elements.
+ * Once an element is released, it breaks the relation. If the
+ * relation is already broken, it frees the xref struct.
+ * The pointer between two elements is sort of a refcount with
+ * max value 1. The relation is only between two elements.
+ * The pointer and the type of elements a and b are conventional.
+ */
+
+#define XREF_BUSY ((struct xref *)1)
+
+struct xref {
+	struct xref *peer;
+};
+
+#endif /* __HAPROXY_XREF_T_H__ */