package main

import "core:fmt"
import "core:thread"
import "core:time"

arr := []int{1,2,3}
main :: proc(){
  // creating a dynamic array of len of array which stores pointer to a thread
  threadPool := make([dynamic]^thread.Thread, 0, len(arr))
  defer delete(threadPool)
  
  for i in 0..<len(arr){
    thr := thread.create(worker) // creating a thread
    if thr != nil{
      // setting up context for our thread
      thr.init_context = context
      // giving our thread id
      thr.user_index = i 
      // Adding our thread to thread pool
      append(&threadPool, thr) 
      
      thread.start(thr) // running our thread
    }
  }
  
  // looping till all of our threads have done their work
  // i.e till our threadPool is empty
  // our threadPool becomes empty because after each 
  for len(threadPool) > 0{
    for i := 0; i < len(threadPool); {
      // Getting a threads address at index i
      t := threadPool[i]
      if thread.is_done(t){
        fmt.printf("Thread %d is done\n", arr[t.user_index])
        thread.destroy(t)
        // removing address of destroyed thread from out pool
        ordered_remove(&threadPool, i)
      }else{
        // If current thread process is not done then go to next one
        i += 1 
      }
    }
  }
}

worker :: proc(t: ^thread.Thread){
  // with the help of context we get what thread we are using.
  fmt.printf("work of t%d\n", arr[t.user_index])
}


/*

odin run thr2.odin -file
work of t1
Thread 1 is done
work of t3
Thread 3 is done
work of t2
Thread 2 is done

odin run thr2.odin -file
work of t1
Thread 1 is done
work of t3
work of t2
Thread 3 is done
Thread 2 is done

*/