Implement Atomics API

src/runtime/runtime-typedarray.cc

Index: src/runtime/runtime-typedarray.cc
diff --git a/src/runtime/runtime-typedarray.cc b/src/runtime/runtime-typedarray.cc
index a92a642bbc936cb8129386ef692acf73324060e7..62d87d6ede86f2e204542971efb28b95d5c3558f 100644
--- a/src/runtime/runtime-typedarray.cc
+++ b/src/runtime/runtime-typedarray.cc
@@ -473,6 +473,29 @@ RUNTIME_FUNCTION(Runtime_IsTypedArray) {
 }
 
 
+RUNTIME_FUNCTION(Runtime_IsSharedTypedArray) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 1);
+  return isolate->heap()->ToBoolean(
+      args[0]->IsJSTypedArray() &&
+      JSTypedArray::cast(args[0])->GetBuffer()->is_shared());
+}
+
+
+RUNTIME_FUNCTION(Runtime_IsSharedIntegerTypedArray) {
+  HandleScope scope(isolate);
+  DCHECK(args.length() == 1);
+  if (!args[0]->IsJSTypedArray()) {
+    return isolate->heap()->false_value();
+  }
+
+  Handle<JSTypedArray> obj(JSTypedArray::cast(args[0]));
+  return isolate->heap()->ToBoolean(obj->GetBuffer()->is_shared() &&
+                                    obj->type() != kExternalFloat32Array &&
+                                    obj->type() != kExternalFloat64Array);
+}
+
+
 RUNTIME_FUNCTION(Runtime_DataViewInitialize) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 4);