我使用时遇到问题SyncManager.Lock
正确。我读了官方文档 https://docs.python.org/3/library/multiprocessing.html#multiprocessing.managers.SyncManager.Lock,但它没有提供有效的示例。我也不知道怎么用SyncManager.Event
正确。
下面是说明我的问题的最小代码。client1
and client2
两者都需要更新共享对象Struct
。不过,我想要client1
首先获取锁,更新Struct
,然后将控制权传递给client2
。如果您按原样运行下面的代码,print
各种说法都是混杂的。
import multiprocessing as mp
from multiprocessing.managers import SyncManager
import time
class Struct:
def __init__(self):
self.a = []
def update(self, x, y):
self.a.append(x ** 2)
def get(self):
return self.a
class Server(SyncManager):
pass
global_S = Struct()
Server.register('Struct', lambda: global_S)
def server_run():
print('Server starting ...')
manager = Server(('localhost', 8080), authkey=b'none')
manager.get_server().serve_forever()
def client_run(name, x, y, wait):
server_proc = Server(('localhost', 8080), authkey=b'none')
server_proc.connect()
S = server_proc.Struct()
with server_proc.Lock():
for i in range(5):
S.update(x+i, y+i)
print(name, S.get())
time.sleep(wait)
server = mp.Process(target=server_run)
server.daemon = True
client1 = mp.Process(target=client_run, args=('c1', 3,7, 1))
client2 = mp.Process(target=client_run, args=('c2', 100,120, .6))
server.start()
time.sleep(0.3) # wait for server to spawn up
client1.start()
time.sleep(0.3)
client2.start()
client1.join()
client2.join()
示例输出:
Server starting ...
c1 [9]
c2 [9, 10000]
c2 [9, 10000, 10201]
c1 [9, 10000, 10201, 16]
c2 [9, 10000, 10201, 16, 10404]
c1 [9, 10000, 10201, 16, 10404, 25]
c2 [9, 10000, 10201, 16, 10404, 25, 10609]
c2 [9, 10000, 10201, 16, 10404, 25, 10609, 10816]
c1 [9, 10000, 10201, 16, 10404, 25, 10609, 10816, 36]
c1 [9, 10000, 10201, 16, 10404, 25, 10609, 10816, 36, 49]