GNU C Library master sources branch, master, updated. glibc-2.16-ports-merge-171-g51a9ba8

[mkuvyrkov at sourceware dot org]

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- Log -----------------------------------------------------------------
http://sources.redhat.com/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=51a9ba860ae3305d475f43f568e8fa51b8a53b6e

commit 51a9ba860ae3305d475f43f568e8fa51b8a53b6e
Author: Maxim Kuvyrkov <maxim@codesourcery.com>
Date:   Mon Aug 13 19:31:00 2012 -0700

    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) \

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog        |    6 ++++++
 include/atomic.h |   18 ++++++++++++++++--
 2 files changed, 22 insertions(+), 2 deletions(-)


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