fix bug of public/writable

paddle/fluid/pybind/global_value_getter_setter.cc

@@ -29,7 +29,7 @@
 #include "paddle/fluid/platform/macros.h"
 #include "pybind11/stl.h"
 
-// NOTE: where is these 2 flags from?
+// NOTE: where are these 2 flags from?
 #ifdef PADDLE_WITH_DISTRIBUTE
 DECLARE_int32(rpc_get_thread_num);
 DECLARE_int32(rpc_prefetch_thread_num);
@@ -197,22 +197,28 @@ void BindGlobalValueGetterSetter(pybind11::module *module) {
   } while (0)
 
 struct RegisterGetterSetterVisitor : public boost::static_visitor<void> {
-  RegisterGetterSetterVisitor(const std::string &name, bool is_public,
+  RegisterGetterSetterVisitor(const std::string &name, bool is_writable,
                               void *value_ptr)
-      : name_(name), value_ptr_(value_ptr) {}
+      : name_(name), is_writable_(is_writable), value_ptr_(value_ptr) {}
 
   template <typename T>
   void operator()(const T &) const {
     auto &value = *static_cast<T *>(value_ptr_);
     auto *instance = GlobalVarGetterSetterRegistry::MutableInstance();
-    instance->Register(name_, is_public_,
+    bool is_public = is_writable_;  // currently, all writable vars are public
+    if (is_public) {
+      instance->Register(name_, is_public,
                          GlobalVarGetterSetterRegistry::CreateGetter(value),
                          GlobalVarGetterSetterRegistry::CreateSetter(&value));
+    } else {
+      instance->Register(name_, is_public,
+                         GlobalVarGetterSetterRegistry::CreateGetter(value));
+    }
   }
 
  private:
   std::string name_;
-  bool is_public_;
+  bool is_writable_;
   void *value_ptr_;
 };