prwlock - многопоточный reader-writer lock

from prwlock.prwlock import RWLock

rwlock = RWLock()

from __future__ import print_function

import os
import time

from multiprocessing import Pool
from prwlock.prwlock import RWLock
def f(rwlock):
    for i in range(2):
        print(os.getpid(), 'Acquiring read lock')
        rwlock.acquire_read()
        print(os.getpid(), 'Sleeping for a while')
        time.sleep(1)
        print(os.getpid(), 'Releasing lock')
        rwlock.release()
        time.sleep(.1)

r = RWLock()
children = 20
pool = Pool(processes=children)
for child in range(children):
    pool.apply_async(f, [r])