Source – SV Verification Directory

Wait Fork

The wait fork statement is used to wait until all the forked processes is completed.

Syntax: Wait Fork

fork
   // process 1
   // process 2
   // process 3
join_none // (join, join_any)
wait fork;

Example Code: Wait Fork

module tb_fork_join_wait;

  initial begin
    fork
      #2  $display("t = %0t, fork 1 => process 1", $time);
      #10 $display("t = %0t, fork 1 => process 2", $time);
      #5  $display("t = %0t, fork 1 => process 3", $time);
    join_any
    $display("--------------- Exited Fork 1 ---------------");
    end


  initial begin
    fork
      #3 $display("t = %0t, fork 2 => process 1", $time);
      #6 $display("t = %0t, fork 2 => process 2", $time);
      #1 $display("t = %0t, fork 2 => process 3", $time);
    join_none
    wait fork;
    $display("--------------- Exited Fork 2 ---------------");
    end

endmodule

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