SystemVerilog Repeat with no Begin

[forkconfig]

I am trying to learn SV on my own and came accross this piece of code:

task reset();
##1 fifo_io.cb.resetb <= 1'b1;
##1 fifo_io.cb.resetb <= 1'b0;
fifo_io.cb.in_vld <= 1'b0;
fifo_io.cb.out_rdy <= 1'b0;
##1 fifo_io.cb.resetb <= 1'b1;
repeat (2) @(fifo_io.cb);
endtask: reset

What I am curious about is what repeat does since there is no begin or end, so what's it repeating? And what does "@(fifo_io.cb)" do?

- - - Updated - - -

Actually one more question, for the code bellow I don't understand what "@(design_io.cb);" is doing.
Essentially it is saying @(clocking block)...so I am assuming it is similar to @(posedge clk), but not sure?
Also just as important, I am not sure what the statement applies to (again with no

task push(input int num = 1);
for (int i = 0; i < num; i++) begin
<stuff>
@(design_io.cb);
end

<more stuff>
@(design_io.cb);
endtask: push

 

[dave_59]

begin/end works like { } in C. Where ever one procedural statement is allowed, you can use begin statement; statement; end. begin/end comes from the Pascal programming language, which was popular at the time Verilog was invented. Many people like to use begin/end around a single statement just for readability.

if (expr)
     statement1;
     statement2;
if (expr2) 
   begin
     statement3;
   end
     statement4;

Only statements 1 and 3 are conditional, but it is much clearer for statement3.

Also, any procedural statement maybe proceeded by one or more event controls, and that statement can be the null statement which is blank.
The syntax for the repeat statement is

repeat ( expression ) statement;
So your expression is 2, and the statement is null, and the event control is @(fifo_io.cb)
That code could also be written as

repeat(2) 
  begin 
    @(fifo_io.cb);
  end

or
repeat(2) 
  @(fifo_io.cb) 
  begin 
    ;
  end

it's all the same.

 

[forkconfig]

Thanks for the helpful explanation.
So for this particular example:

task reset();
##1 fifo_io.cb.resetb <= 1'b1;
##1 fifo_io.cb.resetb <= 1'b0;
fifo_io.cb.in_vld <= 1'b0;
fifo_io.cb.out_rdy <= 1'b0;
##1 fifo_io.cb.resetb <= 1'b1;
repeat (2) @(fifo_io.cb);
endtask: reset


It is repeating "@(fifo_io.cb)" twice. But what does "@(fifo_io.cb)" do exactly?
Understanding that will probably help me understand the second example better as well.

task push(input int num = 1);
for (int i = 0; i < num; i++) begin
<stuff>
@(design_io.cb);
end

<more stuff>
@(design_io.cb);

Thanks