Variable manipulation inside threads?

SystemVerilog
1

I saw someone writing the following code:

event_done[N_GENERATORS];
int done_count;

initial begin
  foreach (gen[i]) begin
    gen[i] = new(done[i]);
    gen[i].run();
  end
  
  foreach (gen[i])
    fork
      automatic int k = i;<font size=20>
      begin
        wait (done[k].triggered);
        done_count++;
      end
    join_none
  
  wait (done_count == N_GENERATORS);

end

How does done_count work in this code? couldn’t it happen that two threads could modify the global done_count variable at the same which causes race condition?