from tqdm import *
from queue import Queue
from threading import Thread
import time

THREADS = 4

class WorkerThread(Thread):
   def __init__(self, queue):
       Thread.__init__(self)
       self.queue = queue

   def run(self):
       while True:
           pbar = self.queue.get()
           time.sleep(2)
           pbar.update()
           self.queue.task_done()

queue = Queue()
# Create worker threads
for x in range(THREADS):
    worker = WorkerThread(queue)
    worker.daemon = True
    worker.start()

pbar = tqdm(total=20)
for tile in range(20):
    queue.put(pbar)
      
pbar.close()
queue.join()