spacepaste

# This is not at all my actual code, but the structure is the same
import threading
def main():
lock = threading.Lock()
threads_ran = 0
def thread_fn():
nonlocal threads_ran
with lock:
print("threads_ran is {} on entry".format(threads_ran))
thread_ran += 1
print("threads_ran is {} on exit".format(threads_ran))
threads = []
for _ in range(10):
threads.append(threading.Thread(target=thread_fn))
for t in threads:
t.start()
for t in threads:
t.join()
main()