From 92d3284ff8548c85b9b928f2615b96da4c4b2618 Mon Sep 17 00:00:00 2001
From: Jason Evans <je@fb.com>
Date: Fri, 18 Mar 2011 18:15:37 -0700
Subject: [PATCH] Add atomic.[ch].

Add atomic.[ch], which should have been part of the previous commit.
---
 jemalloc/include/jemalloc/internal/atomic.h | 77 +++++++++++++++++++++
 jemalloc/src/atomic.c                       |  2 +
 2 files changed, 79 insertions(+)
 create mode 100644 jemalloc/include/jemalloc/internal/atomic.h
 create mode 100644 jemalloc/src/atomic.c

diff --git a/jemalloc/include/jemalloc/internal/atomic.h b/jemalloc/include/jemalloc/internal/atomic.h
new file mode 100644
index 00000000..43faeafc
--- /dev/null
+++ b/jemalloc/include/jemalloc/internal/atomic.h
@@ -0,0 +1,77 @@
+/******************************************************************************/
+#ifdef JEMALLOC_H_TYPES
+
+#endif /* JEMALLOC_H_TYPES */
+/******************************************************************************/
+#ifdef JEMALLOC_H_STRUCTS
+
+#endif /* JEMALLOC_H_STRUCTS */
+/******************************************************************************/
+#ifdef JEMALLOC_H_EXTERNS
+
+#define	atomic_read_uint64(p)	atomic_add_uint64(p, 0)
+#define	atomic_read_uint32(p)	atomic_add_uint32(p, 0)
+
+#if (LG_SIZEOF_PTR == 3)
+#  define atomic_read_z(p) atomic_add_uint64(p, 0)
+#  define atomic_add_z(p, x) atomic_add_uint64(p, x)
+#  define atomic_sub_z(p, x) atomic_sub_uint64(p, x)
+#elif (LG_SIZEOF_PTR == 2)
+#  define atomic_read_z(p) atomic_add_uint32(p, 0)
+#  define atomic_add_z(p, x) atomic_add_uint32(p, x)
+#  define atomic_sub_z(p, x) atomic_sub_uint32(p, x)
+#endif
+
+#endif /* JEMALLOC_H_EXTERNS */
+/******************************************************************************/
+#ifdef JEMALLOC_H_INLINES
+
+#ifndef JEMALLOC_ENABLE_INLINE
+uint64_t	atomic_add_uint64(uint64_t *p, uint64_t x);
+uint64_t	atomic_sub_uint64(uint64_t *p, uint64_t x);
+uint32_t	atomic_add_uint32(uint32_t *p, uint32_t x);
+uint32_t	atomic_sub_uint32(uint32_t *p, uint32_t x);
+#endif
+
+#if (defined(JEMALLOC_ENABLE_INLINE) || defined(JEMALLOC_ATOMIC_C_))
+/* 64-bit operations. */
+#ifdef __GCC_HAVE_SYNC_COMPARE_AND_SWAP_8
+JEMALLOC_INLINE uint64_t
+atomic_add_uint64(uint64_t *p, uint64_t x)
+{
+
+	return (__sync_add_and_fetch(p, x));
+}
+
+JEMALLOC_INLINE uint64_t
+atomic_sub_uint64(uint64_t *p, uint64_t x)
+{
+
+	return (__sync_sub_and_fetch(p, x));
+}
+#else
+#  error "Missing implementation for 64-bit atomic operations"
+#endif
+
+/* 32-bit operations. */
+#ifdef __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4
+JEMALLOC_INLINE uint32_t
+atomic_add_uint32(uint32_t *p, uint32_t x)
+{
+
+	return (__sync_add_and_fetch(p, x));
+}
+
+JEMALLOC_INLINE uint32_t
+atomic_sub_uint32(uint32_t *p, uint32_t x)
+{
+
+	return (__sync_sub_and_fetch(p, x));
+}
+#else
+#  error "Missing implementation for 32-bit atomic operations"
+#endif
+#endif
+
+#endif /* JEMALLOC_H_INLINES */
+/******************************************************************************/
diff --git a/jemalloc/src/atomic.c b/jemalloc/src/atomic.c
new file mode 100644
index 00000000..77ee3131
--- /dev/null
+++ b/jemalloc/src/atomic.c
@@ -0,0 +1,2 @@
+#define	JEMALLOC_ATOMIC_C_
+#include "jemalloc/internal/jemalloc_internal.h"