1 files changed, 115 insertions, 0 deletions
diff --git a/perf/thirdparty/rmind_ringbuf/utils.h b/perf/thirdparty/rmind_ringbuf/utils.h
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+++ b/perf/thirdparty/rmind_ringbuf/utils.h
@@ -0,0 +1,115 @@
+/*
+ * Copyright (c) 1991, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Berkeley Software Design, Inc.
+ *
+ * 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.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
+ *
+ *	@(#)cdefs.h	8.8 (Berkeley) 1/9/95
+ */
+
+#ifndef _UTILS_H_
+#define _UTILS_H_
+
+#include <assert.h>
+
+/*
+ * A regular assert (debug/diagnostic only).
+ */
+#if defined(DEBUG)
+#define	ASSERT		assert
+#else
+#define	ASSERT(x)
+#endif
+
+/*
+ * Minimum, maximum and rounding macros.
+ */
+
+#ifndef MIN
+#define	MIN(x, y)	((x) < (y) ? (x) : (y))
+#endif
+
+#ifndef MAX
+#define	MAX(x, y)	((x) > (y) ? (x) : (y))
+#endif
+
+/*
+ * Branch prediction macros.
+ */
+#ifndef __predict_true
+#define	__predict_true(x)	__builtin_expect((x) != 0, 1)
+#define	__predict_false(x)	__builtin_expect((x) != 0, 0)
+#endif
+
+/*
+ * Atomic operations and memory barriers.  If C11 API is not available,
+ * then wrap the GCC builtin routines.
+ *
+ * Note: This atomic_compare_exchange_weak does not do the C11 thing of
+ * filling *(expected) with the actual value, because we don't need
+ * that here.
+ */
+#ifndef atomic_compare_exchange_weak
+#define	atomic_compare_exchange_weak(ptr, expected, desired) \
+    __sync_bool_compare_and_swap(ptr, *(expected), desired)
+#endif
+
+#ifndef atomic_thread_fence
+#define	memory_order_relaxed	__ATOMIC_RELAXED
+#define	memory_order_acquire	__ATOMIC_ACQUIRE
+#define	memory_order_release	__ATOMIC_RELEASE
+#define	memory_order_seq_cst	__ATOMIC_SEQ_CST
+#define	atomic_thread_fence(m)	__atomic_thread_fence(m)
+#endif
+#ifndef atomic_store_explicit
+#define	atomic_store_explicit	__atomic_store_n
+#endif
+#ifndef atomic_load_explicit
+#define	atomic_load_explicit	__atomic_load_n
+#endif
+
+/*
+ * Exponential back-off for the spinning paths.
+ */
+#define	SPINLOCK_BACKOFF_MIN	4
+#define	SPINLOCK_BACKOFF_MAX	128
+#if defined(__x86_64__) || defined(__i386__)
+#define SPINLOCK_BACKOFF_HOOK	__asm volatile("pause" ::: "memory")
+#else
+#define SPINLOCK_BACKOFF_HOOK
+#endif
+#define	SPINLOCK_BACKOFF(count)					\
+do {								\
+	for (int __i = (count); __i != 0; __i--) {		\
+		SPINLOCK_BACKOFF_HOOK;				\
+	}							\
+	if ((count) < SPINLOCK_BACKOFF_MAX)			\
+		(count) += (count);				\
+} while (/* CONSTCOND */ 0);
+
+#endif