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authorUlrich Drepper <drepper@redhat.com>2006-02-17 18:52:09 +0000
committerUlrich Drepper <drepper@redhat.com>2006-02-17 18:52:09 +0000
commitf1740bc4e3566cad7620e3b36ca00c0c846ec398 (patch)
treea5d315fd5872aba244a5fa63c1bd864f101b9638 /include
parenta7245bf5271d49ed6d13d242801e50ae9911d072 (diff)
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* include/atomic.h (atomic_and, atomic_or): Define.
Diffstat (limited to 'include')
-rw-r--r--include/atomic.h37
1 files changed, 36 insertions, 1 deletions
diff --git a/include/atomic.h b/include/atomic.h
index 8b76435..a1598e3 100644
--- a/include/atomic.h
+++ b/include/atomic.h
@@ -1,5 +1,5 @@
/* Internal macros for atomic operations for GNU C Library.
- Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
+ Copyright (C) 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
@@ -273,6 +273,41 @@
__oldval & __mask; })
#endif
+/* Atomically *mem &= mask and return the old value of *mem. */
+#ifndef atomic_and
+# define atomic_and(mem, mask) \
+ ({ __typeof (*(mem)) __oldval; \
+ __typeof (mem) __memp = (mem); \
+ __typeof (*(mem)) __mask = (mask); \
+ \
+ do \
+ __oldval = (*__memp); \
+ while (__builtin_expect (atomic_compare_and_exchange_bool_acq (__memp, \
+ __oldval \
+ & __mask, \
+ __oldval),\
+ 0)); \
+ \
+ __oldval; })
+#endif
+
+/* Atomically *mem |= mask and return the old value of *mem. */
+#ifndef atomic_or
+# define atomic_or(mem, mask) \
+ ({ __typeof (*(mem)) __oldval; \
+ __typeof (mem) __memp = (mem); \
+ __typeof (*(mem)) __mask = (mask); \
+ \
+ do \
+ __oldval = (*__memp); \
+ while (__builtin_expect (atomic_compare_and_exchange_bool_acq (__memp, \
+ __oldval \
+ | __mask, \
+ __oldval),\
+ 0)); \
+ \
+ __oldval; })
+#endif
#ifndef atomic_full_barrier
# define atomic_full_barrier() __asm ("" ::: "memory")