def long_time_task(name, counter):
time.sleep(0.2)
print 'Run task %s (%s)...\n' % (name, os.getpid())
start = time.time()
#time.sleep(random.random() * 3)
for i in range(50):
time.sleep(0.01)
counter.increment()
end = time.time()
print 'Task %s runs %0.2f seconds.' % (name, (end - start))
if __name__ == '__main__':
manager = Manager()
# 创建共享Counter类实例对象的变量，Counter类的初始值0
counter = manager.Counter(0)
print 'Parent process %s.' % os.getpid()
p = Pool()
for i in range(5):
p.apply_async(long_time_task, args=(str(i), counter))
print 'Waiting for all subprocesses done...'
p.close()
p.join()
print 'All subprocesses done.'
print counter.value()
# 共享实例模板
from multiprocessing import Pool, Value, Lock, Manager
import os, time, random
