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-rw-r--r--sys/sys/refcnt.h38
1 files changed, 38 insertions, 0 deletions
diff --git a/sys/sys/refcnt.h b/sys/sys/refcnt.h
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--- /dev/null
+++ b/sys/sys/refcnt.h
@@ -0,0 +1,38 @@
+/* $OpenBSD: refcnt.h,v 1.4 2016/06/07 07:53:33 mpi Exp $ */
+
+/*
+ * Copyright (c) 2015 David Gwynne <dlg@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef _SYS_REFCNT_H_
+#define _SYS_REFCNT_H_
+
+struct refcnt {
+ unsigned int refs;
+};
+
+#define REFCNT_INITIALIZER() { .refs = 1 }
+
+#ifdef _KERNEL
+
+void refcnt_init(struct refcnt *);
+void refcnt_take(struct refcnt *);
+int refcnt_rele(struct refcnt *);
+void refcnt_rele_wake(struct refcnt *);
+void refcnt_finalize(struct refcnt *, const char *);
+
+#endif /* _KERNEL */
+
+#endif /* _SYS_REFCNT_H_ */