Synchronize Class fields between different threads

[DrCataclysm]

On Friday, 10 November 2017 at 13:50:56 UTC, rikki cattermole 
wrote:
> Remember this bit: Everything on the heap, is not thread-local, 
> it is global. This includes everything inside a class.
>
> When you synchronize (statement) it is locking and then 
> unlocking a mutex. A class has a mutex, simple! It only prevent 
> multiple threads modifying a single thing at specific times, 
> thats all.

this is my implementation of Accept


private void Accept(){
         // start accepting in a different thread
         try{
             _client = _server.accept();
             
emit(ClientConnected(_client.remoteAddress.toAddrString));
             auto _acceptTask = task(&this.Accept);
             _acceptTask.executeInNewThread();
             Receive();
         }
         catch (SocketAcceptException e){
             writeln("Error while accepting connection: " ~ e.msg);
         }
     }

Is _client on the Heap or the Stack? If it is on the Stack, how 
would i get in on the Heap?