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Hardware interview practice

Nested disable fork

HardSystemVerilogSystemVerilog

Which print sequence is produced?

Starting point

Question code

initial begin
  fork
    begin #2 $display("A"); end
    begin
      fork
        #4 $display("B");
        #6 $display("C");
      join_none
      #3;
      disable fork;
      $display("D");
    end
  join
  $display("E");
end
Choose one

Answer choices

  1. A. A, D, E
  2. B. A, D, B, C, E
  3. C. A, B, C, D, E
  4. D. D, E; A, B, and C are all killed
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