为了从混乱中重新构思,我编辑了这个问题:
one.py
import threading
count = 5
dev = threading.Thread(name='dev', target=dev,args=(workQueue,count,))
dev.setDaemon(True)
dev.start()
workQueue = Queue.Queue(10)
queueLock.acquire()
workQueue.put(word)
queueLock.release()
count = 3
time.sleep(2)
count = 5
但我在这里的困惑是我能够在线程之间放入和获取队列中的值,但是在计数的情况下它不会反映出来。
为什么?
我实际上缺少什么意思?
class dev ( threading.Thread ):
def test(self):
while 1:
print count
print self.EPP_Obj
queueLock.acquire()
if not self.workQueue.empty():
data = self.workQueue.get()
print data
queueLock.release()
else:
queueLock.release()
def __init__(self, workQueue, EPP_Obj):
threading.Thread.__init__(self)
self.workQueue = workQueue
self.EPP_Obj = EPP_Obj
答案 0 :(得分:6)
让我们从一个例子开始:
Thread
子类:
import threading
class Dev(threading.Thread):
def __init__(self, workQueue, queueLock, count):
super(Dev, self).__init__() # super() will call Thread.__init__ for you
self.workQueue = workQueue
self.queueLock= queueLock
self.count = count
def run(self): # put inside run your loop
data = ''
while 1:
with self.queueLock:
if not self.workQueue.empty():
data = self.workQueue.get()
print data
print self.count
if data == 'quit':
break
with
语句是获取和释放锁定的明智方法,请查看doc。
现在正在运行的代码:
import Queue
import time
work_q = Queue.Queue() # first create your "work object"
q_lock = threading.Lock()
count = 1
dev = Dev(work_q, q_lock, count) # after instantiate like this your Thread
dev.setDaemon(True)
dev.start()
time.sleep(1)
with q_lock:
work_q.put('word')
# word
# 1
time.sleep(1)
count = 10
with q_lock:
work_q.put('dog')
# dog
# 1
count = 'foo'
with q_lock:
work_q.put('quit')
# quit
# 1
dev.join() # This will prevent the main to exit
# while the dev thread is still running
根据上面的代码,无论我们对self.count
做什么,我们都会清楚地了解count
如何保持不变。
这种行为的原因是调用:
dev = Dev(work_q, q_lock, count)
或
dev = Dev(work_q, q_lock, 1)
是一回事。
Arnold Moon向您展示了改变self.count
的方法。将其调整为我们的示例:
class Dev(threading.Thread):
def __init__(self, workQueue, queueLock, count):
super(Dev, self).__init__()
self.workQueue = workQueue
self.queueLock= queueLock
self.count = count
def set_count(self, value):
self.count = value
def run(self):
data = ''
while 1:
with self.queueLock:
if not self.workQueue.empty():
data = self.workQueue.get()
print data
print self.count
if data == 'quit':
break
在我们正在运行的代码中调用set_count
会更改self.count
:
time.sleep(1)
with q_lock:
work_q.put('word')
# word
# 1
time.sleep(1)
count = dev.count + 9
dev.set_count(count)
with q_lock:
work_q.put('dog')
# dog
# 10
count = 'foo'
with q_lock:
work_q.put('quit')
# quit
# 10
dev.join()
我希望这可以帮助你澄清一些疑问。
答案 1 :(得分:4)
我希望这会对你有所帮助。我想你不知道你需要使用哪种方式。 在python中有一些多线程的方法。 我介绍了使用课程的方式。 你运行以下代码。你会理解的。
main.py
import stringRepeater
import Queue
workqueue = Queue.Queue()
workqueue.put('test1')
workqueue.put('test2')
workqueue.put('test3')
th = stringRepeater.stringRepeater(workqueue,5)
th.start()
print '----daemon is on ----'
th.setCount(3)
workqueue.put('test4')
workqueue.put('test5')
stringRepeater.py
import threading
class stringRepeater(threading.Thread):
def __init__(self, workQueue, count):
threading.Thread.__init__(self)
self.workQueue = workQueue
self.repeatCount = count
def run(self):
while True:
teststring = self.workQueue.get()
for i in range(self.repeatCount):
print teststring
def setCount(self, newcount):
self.repeatCount = newcount