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# ch13/example2.py

import threading

def writer():

global text

global wcount

while True:

with wcounter:

wcount += 1

if wcount == 1:

read_try.acquire()

with resource:

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

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

with wcounter:

wcount -= 1

if wcount == 0:

read_try.release()

def reader():

global rcount

while True:

with read_try:

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. '

wcount = 0

rcount = 0

wcounter = threading.Lock()

rcounter = threading.Lock()

resource = threading.Lock()

read_try = 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()