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authorGleb Smirnoff <glebius@FreeBSD.org>2013-04-08 19:40:53 +0000
committerGleb Smirnoff <glebius@FreeBSD.org>2013-04-08 19:40:53 +0000
commit4e76af6a41e490a83f615cd9104bc7107ad3eef5 (patch)
treede8f9f44d18df863668a203bd7eaeaea76185b92 /sys/sys/counter.h
parent22e71d1cc434ec1b4ed7f87d2e328e804ccd5260 (diff)
downloadsrc-4e76af6a41e490a83f615cd9104bc7107ad3eef5.tar.gz
src-4e76af6a41e490a83f615cd9104bc7107ad3eef5.zip
Merge from projects/counters: counter(9).
Introduce counter(9) API, that implements fast and raceless counters, provided (but not limited to) for gathering of statistical data. See http://lists.freebsd.org/pipermail/freebsd-arch/2013-April/014204.html for more details. In collaboration with: kib Reviewed by: luigi Tested by: ae, ray Sponsored by: Nginx, Inc.
Notes
Notes: svn path=/head/; revision=249268
Diffstat (limited to 'sys/sys/counter.h')
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1 files changed, 42 insertions, 0 deletions
diff --git a/sys/sys/counter.h b/sys/sys/counter.h
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+/*-
+ * Copyright (c) 2012 Gleb Smirnoff <glebius@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, 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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_COUNTER_H__
+#define __SYS_COUNTER_H__
+
+typedef uint64_t *counter_u64_t;
+
+#include <machine/counter.h>
+
+counter_u64_t counter_u64_alloc(int);
+void counter_u64_free(counter_u64_t);
+
+void counter_u64_zero(counter_u64_t);
+uint64_t counter_u64_fetch(counter_u64_t);
+
+#endif /* ! __SYS_COUNTER_H__ */