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+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2017, Jeffrey Roberson <jeff@freebsd.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice unmodified, this list of conditions, and the following
+ * disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef _SYS__DOMAINSET_H_
+#define _SYS__DOMAINSET_H_
+
+#include <sys/_bitset.h>
+
+#ifdef _KERNEL
+#define DOMAINSET_SETSIZE MAXMEMDOM
+#endif
+
+#define DOMAINSET_MAXSIZE 256
+
+#ifndef DOMAINSET_SETSIZE
+#define DOMAINSET_SETSIZE DOMAINSET_MAXSIZE
+#endif
+
+BITSET_DEFINE(_domainset, DOMAINSET_SETSIZE);
+typedef struct _domainset domainset_t;
+
+/*
+ * This structure is intended to be embedded in objects which have policy
+ * attributes. Each object keeps its own iterator so round-robin is
+ * synchronized and accurate.
+ */
+struct domainset;
+struct domainset_ref {
+ struct domainset * volatile dr_policy;
+ int dr_iterator;
+};
+
+#endif /* !_SYS__DOMAINSET_H_ */