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authorTorvald Riegel <triegel@redhat.com>2015-06-23 15:22:25 +0200
committerTorvald Riegel <triegel@redhat.com>2015-06-30 15:57:15 +0200
commit4eb984d3ab5641ce7992204756ac15a61f5f7181 (patch)
tree12603bae9d2582033a3186174d1379121e1ea642 /include
parente02920bc029019443326eecaa7b267b78ff2892e (diff)
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Clean up BUSY_WAIT_NOP and atomic_delay.
This patch combines BUSY_WAIT_NOP and atomic_delay into a new atomic_spin_nop function and adjusts all clients. The new function is put into atomic.h because what is best done in a spin loop is architecture-specific, and atomics must be used for spinning. The function name is meant to tell users that this has no effect on synchronization semantics but is a performance aid for spinning.
Diffstat (limited to 'include')
-rw-r--r--include/atomic.h7
1 files changed, 4 insertions, 3 deletions
diff --git a/include/atomic.h b/include/atomic.h
index 7fd70c4..221bea0 100644
--- a/include/atomic.h
+++ b/include/atomic.h
@@ -754,9 +754,10 @@ void __atomic_link_error (void);
#endif /* !USE_ATOMIC_COMPILER_BUILTINS */
-
-#ifndef atomic_delay
-# define atomic_delay() do { /* nothing */ } while (0)
+/* This operation does not affect synchronization semantics but can be used
+ in the body of a spin loop to potentially improve its efficiency. */
+#ifndef atomic_spin_nop
+# define atomic_spin_nop() do { /* nothing */ } while (0)
#endif
#endif /* atomic.h */