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# ch13/example1.py

import threading

def writer():

global text

while True:

with resource:

print(f'Writing being done by {threading.current_thread().name}.')

text += f'Writing was done by {threading.current_thread().name}. '

def reader():

global rcount

while True:

with rcounter:

rcount += 1

if rcount == 1:

resource.acquire()

print(f'Reading being done by {threading.current_thread().name}:')

print(text)

with rcounter:

rcount -= 1

if rcount == 0:

resource.release()

text = 'This is some text. '

rcount = 0

rcounter = threading.Lock()

resource = threading.Lock()

threads = [threading.Thread(target=reader) for i in range(3)] + [threading.Thread(target=writer) for i in range(2)]

for thread in threads:

thread.start()