复制 object 的引用或将其传递给方法/构造函数是线程安全的吗？

Question

I have an object that is shared in read/write between threads.

Assuming that the synchonization is correctely done, if A is the object previously initialized when no threads are running, when they start working is thread-safe do:

Object B = A;

DoSomething(A);

?

Answer 1

References can safely be shared; however, access to the actual object may require synchronization.