Background thread, async and GUI (dlangui)

[Ali Çehreli]

On 7/12/22 11:47, Bagomot wrote:

 > I now have a couple more questions about `Task`:
 > 1) How to run a non-static class method through `task`?
 > 2) How to use `taskPool` to run a series of tasks of the same type (from
 > question 1)?

As a friendly reminder, these questions could be more useful in a 
separate forum thread. :)

import std.stdio;
import std.parallelism;
import std.algorithm;
import std.range;

interface Animal {
   string song();
}

class Dog : Animal {
   string voice_;

   this(string voice) {
     this.voice_ = voice;
   }

   string song() {
     return voice_ ~ " " ~ voice_;
   }
}

void main() {
   auto voices = [ "hav", "woof", "bark", "gav", "grrr" ];
   auto dogs = voices.map!(voice => new Dog(voice)).array;

   // No need to specify this; just being silly...
   const workerCount = totalCPUs + 7;

   auto tp = new TaskPool(workerCount);
   scope (exit) tp.finish();

   // a) Classic foreach loop
   foreach (dog; tp.parallel(dogs)) {
     writeln(dog.song);
   }

   // b) Adding individual tasks (could be a foreach loop)
   dogs.each!(dog => tp.put(task!(d => writeln(d.song))(dog)));
}

Ali