我有一个简单的多线程代码,其中一些线程将项目放入队列,一些线程从队列中获取项目: https://repl.it/@chuoi123/simpleThreading
如果您不想访问上面的链接,请输入完整代码: 你知道吗
import threading
import queue
import time
def PutWorker(maxValue):
global item
while True:
with putLock:
if item > maxValue:
break
q.put(item)
print('Added item ' + str(item))
item += 1
time.sleep(0.5)
def GetWorker():
while True:
item = q.get()
if item is None:
break
with getLock:
print('Deleted item ' + str(item))
q.task_done()
time.sleep(1)
## main process from here
q = queue.Queue()
threads = []
putLock = threading.Lock()
getLock = threading.Lock()
item = 1
while True:
try:
numValue = int(input('Number of items in queue: '))
numThreadsGet = int(input('Number of getting threads: '))
numThreadsPut = int(input('Number of putting threads: '))
break
except:
print('Input must be ingeter.')
for i in range(numThreadsPut):
t = threading.Thread(target=PutWorker(numValue),daemon = True)
t.start()
threads.append(t)
for i in range(numThreadsGet):
t = threading.Thread(target=GetWorker,daemon = True)
t.start()
threads.append(t)
我的问题是,放置线程和获取线程不能同时运行,所以一个类型在代码中按顺序依次运行。当前代码的结果:
Added item 1
Added item 2
Added item 3
Added item 4
Added item 5
...
Deleted item 1
Deleted item 2
Deleted item 3
Deleted item 4
Deleted item 5
...
我想要这样的结果:
Added item 1
Added item 2
Deleted item 1
Added item 3
Deleted item 2
Added item 4
Deleted item 3
Added item 5
Deleted item 4
Deleted item 5
...
为什么会这样?我能为我的目标做些什么?你知道吗
编辑:在@user68014的答案中尝试解决方案之后,我发现另一种方法是从def PutWorker()
中删除参数,并简单地使用全局变量,如item
。你知道吗
这条线有问题:
实际上,您正在调用PutWorker以使目标进入线程。所以这一切都发生在线程实际创建之前。您应该传入函数本身。你知道吗
比如:
没有参数,没有调用,它只是一个函数(哪个线程将调用它来启动线程)
因为它有一个参数,所以您需要在其中“Curry”。我会这样做:
。。。你知道吗
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