Python的Queue模块中提供了同步的、线程安全的队列类.
1.FIFO（先入先出)队列Queue，
2.LIFO（后入先出）队列LifoQueue，
3.优先级队列PriorityQueue。
这些队列都实现了锁原语，能够在多线程中直接使用。可以使用队列来实现线程间的同步。
代码示例如下:
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| #!/usr/bin/python
import Queue
import threading
import time
exitFlag = 0
class QThread (threading.Thread):
"QThread class"
def __init__(self, threadID, name, queue):
threading.Thread.__init__(self)
self.threadID = threadID
self.name = name
self.queue = queue
#线程函数
def run(self):
print "Starting " + self.name
process_data(self.name, self.queue)
print "Exiting " + self.name
#处理数据
def process_data(threadName, q):
while not exitFlag:
queueLock.acquire()
if not workQueue.empty():
data = q.get()
queueLock.release()
print "%s processing %s" % (threadName, data)
else:
queueLock.release()
time.sleep(1)
threadList = ["ksnow", "kair", "baby"]
nameList = ["One", "Two", "Three", "Four", "Five"]
queueLock = threading.Lock()
#创建FIFO（先入先出)队列Queue
workQueue = Queue.Queue(5)
threads = []
threadID = 1
# 创建新线程
for tName in threadList:
thread = QThread(threadID, tName, workQueue)
thread.start()
threads.append(thread)
threadID += 1
# 填充队列
queueLock.acquire()
for word in nameList:
workQueue.put(word)
queueLock.release()
# 等待队列清空
while not workQueue.empty():
pass
# 通知线程是时候退出
exitFlag = 1
# 等待所有线程完成
for t in threads:
t.join()
print "Exiting Main Thread"
|
运行结果如下:
ksnowlv@ksnowlvdeMacBook-Pro~/Documents/lvwei projects/python$python thread_queue.py
Starting ksnow
Starting kair
Starting baby
kair processing One
ksnow processing Two
baby processing Three
ksnow processing Four
kair processing Five
Exiting baby
Exiting ksnow
Exiting kair
Exiting Main Thread