1 files changed, 16 insertions, 0 deletions
diff --git a/ruby_atomic.h b/ruby_atomic.h
index 57d341082d..085c307ac6 100644
--- a/ruby_atomic.h
+++ b/ruby_atomic.h
@@ -1,3 +1,6 @@
+#ifndef INTERNAL_ATOMIC_H
+#define INTERNAL_ATOMIC_H
+
 #include "ruby/atomic.h"
 
 /* shim macros only */
@@ -21,3 +24,16 @@
 #define ATOMIC_SUB(var, val) RUBY_ATOMIC_SUB(var, val)
 #define ATOMIC_VALUE_CAS(var, oldval, val) RUBY_ATOMIC_VALUE_CAS(var, oldval, val)
 #define ATOMIC_VALUE_EXCHANGE(var, val) RUBY_ATOMIC_VALUE_EXCHANGE(var, val)
+
+static inline rb_atomic_t
+rbimpl_atomic_load_relaxed(rb_atomic_t *ptr)
+{
+#if defined(HAVE_GCC_ATOMIC_BUILTINS)
+    return __atomic_load_n(ptr, __ATOMIC_RELAXED);
+#else
+    return *ptr;
+#endif
+}
+#define ATOMIC_LOAD_RELAXED(var) rbimpl_atomic_load_relaxed(&(var))
+
+#endif