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  • fork join statement with for loop

fork join statement with for loop

SystemVerilog 6454
#systemverilog 600
zz8318
zz8318
Full Access
174 posts
March 31, 2023 at 12:58 pm

I'm trying to work on below code. Let it say we have the index from 0 to 4 for each tasks we process and we want them spawned together without time-consumed. And below code is the simplest to work but somehow it's too cumbersome.. How to use for-loop to achieve the same purpose ?

task my_task1(int idx);
  // do something
endtask
 
task my_task2(int idx);
  // do something
endtask
 
fork
  my_task1(0);
  my_task2(0);
  my_task1(1);
  my_task2(1);
  my_task1(2);
  my_task2(2);
  my_task1(3);
  my_task2(3);
  my_task1(4);
  my_task2(4);
join_none

Replies

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dave_59
dave_59
Forum Moderator
10898 posts
March 31, 2023 at 4:28 pm

In reply to zz8318:

for(int i=0;i<5;i++)
   fork
     automatic int j = i;
     my_task1(j);
     my_task2(j);
   end

Note, the automatic keyword is needed if the context of the code in not already automatic.

— Dave Rich, Verification Architect, Siemens EDA

zz8318
zz8318
Full Access
174 posts
March 31, 2023 at 5:57 pm

In reply to dave_59:

Hi Dave, What's the difference if we code "automatic int j = i" inside the fork, or outside the fork ?

for(int i=0;i<5;i++)begin
   fork
     automatic int j = i;
     my_task1(j);
     my_task2(j);
   join_none
 end

for(int i=0;i<5;i++) begin
    automatic int j = i;
   fork
     my_task1(j);
     my_task2(j);
   join_none
end
dave_59
dave_59
Forum Moderator
10898 posts
March 31, 2023 at 7:19 pm

In reply to zz8318:

No difference except you need an extra begin/end scope to put the variable declaration outside the fork.

— Dave Rich, Verification Architect, Siemens EDA

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