进程锁其实是锁的输入终端，屏幕，太多的进程，为了防止打印错乱而锁，作用不大
from multiprocessing import Process, Lock
def f(l, i):
l.acquire()
print('hello world', i)
l.release()
if __name__ == '__main__':
lock = Lock()
for num in range(10):
Process(target=f, args=(lock, num)).start()
...
