From: Maxim Kuvyrkov <maxim@codesourcery.com>
Date: Tue, 14 Aug 2012 02:31:00 +0000 (-0700)
Subject: Add explicit acquire/release semantics to atomic_exchange_and_add.
X-Git-Tag: upstream/2.16.90~707
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=51a9ba860ae3305d475f43f568e8fa51b8a53b6e;p=platform%2Fupstream%2Fglibc.git

Add explicit acquire/release semantics to atomic_exchange_and_add.
---

diff --git a/ChangeLog b/ChangeLog
index 0377ac9..2adf44c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2012-08-13  Maxim Kuvyrkov  <maxim@codesourcery.com>
+
+        * include/atomic.h (atomic_exchange_and_add): Split into ...
+        (atomic_exchange_and_add_acq, atomic_exchange_and_add_rel): ... these.
+        New atomic macros.
+
 2012-08-13  Markus Trippelsdorf  <markus@trippelsdorf.de>
 
 	* sysdeps/x86_64/fpu/libm-test-ulps: Update.
diff --git a/include/atomic.h b/include/atomic.h
index 3ccb46d..bc20772 100644
--- a/include/atomic.h
+++ b/include/atomic.h
@@ -198,8 +198,12 @@
 
 
 /* Add VALUE to *MEM and return the old value of *MEM.  */
-#ifndef atomic_exchange_and_add
-# define atomic_exchange_and_add(mem, value) \
+#ifndef atomic_exchange_and_add_acq
+# ifdef atomic_exchange_and_add
+#  define atomic_exchange_and_add_acq(mem, value) \
+  atomic_exchange_and_add (mem, value)
+# else
+#  define atomic_exchange_and_add_acq(mem, value) \
   ({ __typeof (*(mem)) __atg6_oldval;					      \
      __typeof (mem) __atg6_memp = (mem);				      \
      __typeof (*(mem)) __atg6_value = (value);				      \
@@ -213,8 +217,18 @@
 						   __atg6_oldval), 0));	      \
 									      \
      __atg6_oldval; })
+# endif
 #endif
 
+#ifndef atomic_exchange_and_add_rel
+# define atomic_exchange_and_add_rel(mem, value) \
+  atomic_exchange_and_add_acq(mem, value)
+#endif
+
+#ifndef atomic_exchange_and_add
+# define atomic_exchange_and_add(mem, value) \
+  atomic_exchange_and_add_acq(mem, value)
+#endif
 
 #ifndef catomic_exchange_and_add
 # define catomic_exchange_and_add(mem, value) \