From 5faf4cc77b6a223dc86fddc69e0f377d27f5585a Mon Sep 17 00:00:00 2001
From: ngoto <ngoto@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Tue, 27 Nov 2012 10:21:59 +0000
Subject: * ruby_atomic.h (ATOMIC_CAS): added for Solaris and other platforms.
 * ruby_atomic.h, signal.c (NEED_RUBY_ATOMIC_OPS): renamed from  
 NEED_RUBY_ATOMIC_EXCHANGE. * signal.c (ruby_atomic_compare_and_swap): naive,
 non-atomic   compare-and-swap implementation only used for platforms without 
  valid support for atomic operations.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@37897 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 signal.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

(limited to 'signal.c')

diff --git a/signal.c b/signal.c
index ba19e6d0af..f419d45845 100644
--- a/signal.c
+++ b/signal.c
@@ -23,7 +23,7 @@
 # include "nacl/signal.h"
 #endif
 
-#ifdef NEED_RUBY_ATOMIC_EXCHANGE
+#ifdef NEED_RUBY_ATOMIC_OPS
 rb_atomic_t
 ruby_atomic_exchange(rb_atomic_t *ptr, rb_atomic_t val)
 {
@@ -31,6 +31,17 @@ ruby_atomic_exchange(rb_atomic_t *ptr, rb_atomic_t val)
     *ptr = val;
     return old;
 }
+
+rb_atomic_t
+ruby_atomic_compare_and_swap(rb_atomic_t *ptr, rb_atomic_t cmp,
+			     rb_atomic_t newval)
+{
+    rb_atomic_t old = *ptr;
+    if (old == cmp) {
+      *ptr = newval;
+    }
+    return old;
+}
 #endif
 
 #if defined(__BEOS__) || defined(__HAIKU__)
-- 
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