Cocos2d-x(cpp), is UserDefault thread safe?

cocos2d-x C++
#1

In cocos2d-x v3.16, UserDefault is a singleton class. The implementation of this singleton is below:

UserDefault* UserDefault::getInstance()
{
if (! _userDefault)
{
#ifdef KEEP_COMPATABILITY
initXMLFilePath();
#endif
_userDefault = new (std::nothrow) UserDefault();
}

return _userDefault;

}

is it ensure thread safe?

#2

Cocos2d is not thread safe. I do run some things in std::thread but not things that update the UI. I do however update data, build components, etc.