GNU C Library master sources branch master updated. glibc-2.24-42-g13cb8f7

[torvald at sourceware dot org]

This is an automated email from the git hooks/post-receive script. It was
generated because a ref change was pushed to the repository containing
the project "GNU C Library master sources".

The branch, master has been updated
       via  13cb8f76da9d9420330796f469dbf10643ba5b12 (commit)
      from  a194625ef31f0c33afae9b53e2dfaa17c2517606 (commit)

Those revisions listed above that are new to this repository have
not appeared on any other notification email; so we list those
revisions in full, below.

- Log -----------------------------------------------------------------
http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=13cb8f76da9d9420330796f469dbf10643ba5b12

commit 13cb8f76da9d9420330796f469dbf10643ba5b12
Author: Torvald Riegel <triegel@redhat.com>
Date:   Thu May 26 00:57:27 2016 +0200

    Add atomic operations required by the new condition variable.
    
    	* include/atomic.h (atomic_fetch_and_relaxed,
    	atomic_fetch_and_release, atomic_fetch_or_release,
    	atomic_fetch_xor_release): New.

diff --git a/ChangeLog b/ChangeLog
index d8ba9cd..6a3637c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2016-08-09  Torvald Riegel  <triegel@redhat.com>
+
+	* include/atomic.h (atomic_fetch_and_relaxed,
+	atomic_fetch_and_release, atomic_fetch_or_release,
+	atomic_fetch_xor_release): New.
+
 2016-08-06  Christian Seiler  <christian@iwakd.de>
 
 	[BZ #20444]
diff --git a/include/atomic.h b/include/atomic.h
index 129ee24..5a8e7e7 100644
--- a/include/atomic.h
+++ b/include/atomic.h
@@ -611,9 +611,15 @@ void __atomic_link_error (void);
   ({ __atomic_check_size((mem));					      \
   __atomic_fetch_add ((mem), (operand), __ATOMIC_ACQ_REL); })
 
+# define atomic_fetch_and_relaxed(mem, operand) \
+  ({ __atomic_check_size((mem));					      \
+  __atomic_fetch_and ((mem), (operand), __ATOMIC_RELAXED); })
 # define atomic_fetch_and_acquire(mem, operand) \
   ({ __atomic_check_size((mem));					      \
   __atomic_fetch_and ((mem), (operand), __ATOMIC_ACQUIRE); })
+# define atomic_fetch_and_release(mem, operand) \
+  ({ __atomic_check_size((mem));					      \
+  __atomic_fetch_and ((mem), (operand), __ATOMIC_RELEASE); })
 
 # define atomic_fetch_or_relaxed(mem, operand) \
   ({ __atomic_check_size((mem));					      \
@@ -621,6 +627,13 @@ void __atomic_link_error (void);
 # define atomic_fetch_or_acquire(mem, operand) \
   ({ __atomic_check_size((mem));					      \
   __atomic_fetch_or ((mem), (operand), __ATOMIC_ACQUIRE); })
+# define atomic_fetch_or_release(mem, operand) \
+  ({ __atomic_check_size((mem));					      \
+  __atomic_fetch_or ((mem), (operand), __ATOMIC_RELEASE); })
+
+# define atomic_fetch_xor_release(mem, operand) \
+  ({ __atomic_check_size((mem));					      \
+  __atomic_fetch_xor ((mem), (operand), __ATOMIC_RELEASE); })
 
 #else /* !USE_ATOMIC_COMPILER_BUILTINS  */
 
@@ -724,12 +737,24 @@ void __atomic_link_error (void);
    atomic_exchange_and_add_acq ((mem), (operand)); })
 # endif
 
+/* XXX Fall back to acquire MO because archs do not define a weaker
+   atomic_and_val.  */
+# ifndef atomic_fetch_and_relaxed
+#  define atomic_fetch_and_relaxed(mem, operand) \
+   atomic_fetch_and_acquire ((mem), (operand))
+# endif
 /* XXX The default for atomic_and_val has acquire semantics, but this is not
    documented.  */
 # ifndef atomic_fetch_and_acquire
 #  define atomic_fetch_and_acquire(mem, operand) \
    atomic_and_val ((mem), (operand))
 # endif
+# ifndef atomic_fetch_and_release
+/* XXX This unnecessarily has acquire MO.  */
+#  define atomic_fetch_and_release(mem, operand) \
+   ({ atomic_thread_fence_release ();					      \
+   atomic_and_val ((mem), (operand)); })
+# endif
 
 /* XXX The default for atomic_or_val has acquire semantics, but this is not
    documented.  */
@@ -743,6 +768,28 @@ void __atomic_link_error (void);
 #  define atomic_fetch_or_relaxed(mem, operand) \
    atomic_fetch_or_acquire ((mem), (operand))
 # endif
+/* XXX Contains an unnecessary acquire MO because archs do not define a weaker
+   atomic_or_val.  */
+# ifndef atomic_fetch_or_release
+#  define atomic_fetch_or_release(mem, operand) \
+   ({ atomic_thread_fence_release ();					      \
+   atomic_fetch_or_acquire ((mem), (operand)); })
+# endif
+
+# ifndef atomic_fetch_xor_release
+# define atomic_fetch_xor_release(mem, operand) \
+  ({ __typeof (*(mem)) __atg104_old;					      \
+     __typeof (mem) __atg104_memp = (mem);				      \
+     __typeof (*(mem)) __atg104_op = (operand);				      \
+									      \
+     do									      \
+       __atg104_old = (*__atg104_memp);					      \
+     while (__builtin_expect						      \
+	    (atomic_compare_and_exchange_bool_rel (			      \
+		__atg104_memp, __atg104_old ^ __atg104_op, __atg104_old), 0));\
+									      \
+     __atg104_old; })
+#endif
 
 #endif /* !USE_ATOMIC_COMPILER_BUILTINS  */
 

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

Summary of changes:
 ChangeLog        |    6 ++++++
 include/atomic.h |   47 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 53 insertions(+), 0 deletions(-)


hooks/post-receive
-- 
GNU C Library master sources