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[3.8] bpo-40387: Improve queue join() example. (GH-19724) #19726

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Apr 27, 2020
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[3.8] bpo-40387: Improve queue join() example. (GH-19724) #19726

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bpo-40387: Improve queue join() example. (GH-19724) 
(cherry picked from commit 88499f1)

Co-authored-by: Raymond Hettinger <[email protected]>
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@rhettinger @miss-islington
rhettinger authored and miss-islington committed Apr 27, 2020
commit cbc9a8f9328ea639cd77b4568c9b9cf002233d84
28 changes: 12 additions & 16 deletions Doc/library/queue.rst
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Expand Up @@ -190,32 +190,28 @@ fully processed by daemon consumer threads.

Example of how to wait for enqueued tasks to be completed::

import threading, queue

q = queue.Queue()

def worker():
while True:
item = q.get()
if item is None:
break
do_work(item)
print(f'Working on {item}')
print(f'Finished {item}')
q.task_done()

q = queue.Queue()
threads = []
for i in range(num_worker_threads):
t = threading.Thread(target=worker)
t.start()
threads.append(t)
# turn-on the worker thread
threading.Thread(target=worker, daemon=True).start()

for item in source():
# send thirty task requests to the worker
for item in range(30):
q.put(item)
print('All task requests sent\n', end='')

# block until all tasks are done
q.join()

# stop workers
for i in range(num_worker_threads):
q.put(None)
for t in threads:
t.join()
print('All work completed')


SimpleQueue Objects
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