X-Git-Url: http://git.droids-corp.org/?a=blobdiff_plain;f=lib%2Flibrte_eal%2Fcommon%2Finclude%2Frte_atomic.h;h=a5b6eec30276c0fee9764b90a099c8c74cf72ed5;hb=3031749c2df04a63cdcef186dcce3781e61436e8;hp=c2e4f4781b6d9de31923b8884cc29ae52d42da0a;hpb=e9d48c0072d36eb6423b45fba4ec49d0def6c36f;p=dpdk.git

diff --git a/lib/librte_eal/common/include/rte_atomic.h b/lib/librte_eal/common/include/rte_atomic.h
index c2e4f4781b..a5b6eec302 100644
--- a/lib/librte_eal/common/include/rte_atomic.h
+++ b/lib/librte_eal/common/include/rte_atomic.h
@@ -1,13 +1,13 @@
 /*-
  *   BSD LICENSE
- * 
+ *
  *   Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
  *   All rights reserved.
- * 
+ *
  *   Redistribution and use in source and binary forms, with or without
  *   modification, are permitted provided that the following conditions
  *   are met:
- * 
+ *
  *     * Redistributions of source code must retain the above copyright
  *       notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above copyright
@@ -17,7 +17,7 @@
  *     * Neither the name of Intel Corporation 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 COPYRIGHT HOLDERS AND CONTRIBUTORS
  *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
@@ -81,6 +81,16 @@ extern "C" {
  */
 #define	rte_rmb() _mm_lfence()
 
+/**
+ * Compiler barrier.
+ *
+ * Guarantees that operation reordering does not occur at compile time
+ * for operations directly before and after the barrier.
+ */
+#define	rte_compiler_barrier() do {		\
+	asm volatile ("" : : : "memory");	\
+} while(0)
+
 #include <emmintrin.h>
 
 /**
@@ -985,7 +995,7 @@ rte_atomic64_add(rte_atomic64_t *v, int64_t inc)
  * @param v
  *   A pointer to the atomic counter.
  * @param dec
- *   The value to be substracted from the counter.
+ *   The value to be subtracted from the counter.
  */
 static inline void
 rte_atomic64_sub(rte_atomic64_t *v, int64_t dec)
@@ -1040,14 +1050,14 @@ rte_atomic64_add_return(rte_atomic64_t *v, int64_t inc)
  * Subtract a 64-bit value from an atomic counter and return the result.
  *
  * Atomically subtracts the 64-bit value (dec) from the atomic counter (v)
- * and returns the value of v after the substraction.
+ * and returns the value of v after the subtraction.
  *
  * @param v
  *   A pointer to the atomic counter.
  * @param dec
- *   The value to be substracted from the counter.
+ *   The value to be subtracted from the counter.
  * @return
- *   The value of v after the substraction.
+ *   The value of v after the subtraction.
  */
 static inline int64_t
 rte_atomic64_sub_return(rte_atomic64_t *v, int64_t dec)
@@ -1080,7 +1090,7 @@ static inline int rte_atomic64_inc_and_test(rte_atomic64_t *v)
  * @param v
  *   A pointer to the atomic counter.
  * @return
- *   True if the result after substraction is 0; false otherwise.
+ *   True if the result after subtraction is 0; false otherwise.
  */
 static inline int rte_atomic64_dec_and_test(rte_atomic64_t *v)
 {