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Question: How I correctly apply Thread[Task] package?

Question:How I correctly apply Thread[Task] package?

Ali Hassani 120 Maple
task grid threads parallelization
August 03 2020
2
Dear All,
I want to learn to work with Thread[Task] packages in Maple.However, I am confused when I studied the Help of Maple about. I can’t find out the Start and Continue command in the package. I can’t execute any simple program by Threads [Task]. The help of Maple has an example of the following:
with(Threads[Task]);
cont := proc( a, b )
   return a + b;
end proc;      
task := proc( i, j )
   local k;
   if ( j-i < 1000 ) then
       return add( k, k=i..j );
   else
       k := floor( (j-i)/2 )+i;
       Continue( cont, Task=[ task, i, k ], Task=[ task, k+1, j ] );
   end if;
end proc;
Start(task, 1, 10^7);

I want to remove if-clause in task procedure as the following. In the other words, I want to use multi-threads for any values of i and j. However, the program doesn’t work correctly. What hint is something I don’t correctly understand?

Besides, I may don’t find deeply out the meaning and deference of parent, leaf, child, and continuation tasks. would you explain to me those tasks easily? The help of Maple doesn't convey a unified explanation for them.
 
Please guide me to overcome the problem.
Best wishes,
 
with(Threads[Task]);
cont := proc( a, b )
   return a + b;
end proc;      
task := proc( i, j )
   local k;
        k := floor( (j-i)/2 )+i;
       Continue( cont, Task=[ task, i, k ], Task=[ task, k+1, j ] );
end proc;
Start(task, 1, 10^7);
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