標籤:
Python的Queue模組中提供了同步的、安全執行緒的隊列類,包括FIFO(先入先出)隊列Queue,LIFO(後入先出)隊列LifoQueue,和優先順序隊列PriorityQueue。這些隊列都實現了鎖原語,能夠在多線程中直接使用。可以使用隊列來實現線程間的同步。
Queue模組中的常用方法:
- Queue.qsize() 返回隊列的大小
- Queue.empty() 如果隊列為空白,返回True,反之False
- Queue.full() 如果隊列滿了,返回True,反之False
- Queue.full 與 maxsize 大小對應
- Queue.get([block[, timeout]])擷取隊列,timeout等待時間
- Queue.get_nowait() 相當Queue.get(False)
- Queue.put(item) 寫入隊列,timeout等待時間
- Queue.put_nowait(item) 相當Queue.put(item, False)
- Queue.task_done() 在完成一項工作之後,Queue.task_done()函數向任務已經完成的隊列發送一個訊號
- Queue.join() 實際上意味著等到隊列為空白,再執行別的操作
#coding=utf-8#!/usr/bin/pythonimport Queueimport threadingimport timeexitFlag = 0class myThread (threading.Thread): def __init__(self, threadID, name, q): threading.Thread.__init__(self) self.threadID = threadID self.name = name self.q = q def run(self): print "Starting " + self.name process_data(self.name, self.q) print "Exiting " + self.namedef 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 = ["Thread-1", "Thread-2", "Thread-3"]nameList = ["One", "Two", "Three", "Four", "Five"]queueLock = threading.Lock()workQueue = Queue.Queue(10)threads = []threadID = 1# 建立新線程for tName in threadList: thread = myThread(threadID, tName, workQueue) thread.start() threads.append(thread) threadID += 1# 填充隊列queueLock.acquire()for word in nameList: workQueue.put(word)queueLock.release()# 等待隊列清空while not workQueue.empty(): pass# 通知線程是時候退出exitFlag = 1# 等待所有線程完成for t in threads: t.join()print "Exiting Main Thread"
python多線程--優先順序隊列(Queue)