ruby_atomic.h: atomic VALUE operations

* ruby_atomic.h (ATOMIC_VALUE_EXCHANGE, ATOMIC_VALUE_CAS): add
  atomic operations for VALUE.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51498 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 2 insertions, 4 deletions

diff --git a/node.c b/node.c
index 7551a811c8..84e7bddf34 100644
--- a/node.c
+++ b/node.c
@@ -1090,11 +1090,9 @@ rb_alloc_tmp_buffer(volatile VALUE *store, long len)
 void
 rb_free_tmp_buffer(volatile VALUE *store)
 {
-    VALUE s = *store;
-    *store = 0;
+    VALUE s = ATOMIC_VALUE_EXCHANGE(*store, 0);
     if (s) {
-	void *ptr = RNODE(s)->u1.node;
-	RNODE(s)->u1.node = 0;
+	void *ptr = ATOMIC_PTR_EXCHANGE(RNODE(s)->u1.node, 0);
 	RNODE(s)->u3.cnt = 0;
 	xfree(ptr);
     }