Python的线程池实现
实现代码：#coding:utf-8
import Queue
import threading
import sys
import time
import urllib
#替我们工作的线程池中的线程
class MyThread(threading.Thread):
def __init__(self, workQueue, resultQueue,timeout=30, **kwargs):
threading.Thread.__init__(self, kwargs=kwargs)
#线程在结束前等待任务队列多长时间
self.timeout = timeout
self.setDaemon(True)
self.workQueue = workQueue
self.resultQueue = resultQueue
self.start()
def run(self):
while True:
try:
#从工作队列中获取一个任务
callable, args, kwargs = self.workQueue.get(timeout=self.timeout)
#我们要执行的任务
res = callable(args, kwargs)
#报任务返回的结果放在结果队列中
self.resultQueue.put(res+" | "+self.getName())
except Queue.Empty: #任务队列空的时候结束此线程
break
except :
print sys.exc_info()
raise
class ThreadPool:
def __init__( self, num_of_threads=10):
self.workQueue = Queue.Queue()
self.resultQueue = Queue.Queue()
self.threads = []
self.__createThreadPool( num_of_threads )
def __createThreadPool( self, num_of_threads ):
for i in range( num_of_threads ):
thread = MyThread( self.workQueue, self.resultQueue )
self.threads.append(thread)
def wait_for_complete(self):
#等待所有线程完成。
while len(self.threads):
thread = self.threads.pop()
#等待线程结束
if thread.isAlive():#判断线程是否还存活来决定是否调用join
thread.join()
def add_job( self, callable, *args, **kwargs ):
self.workQueue.put( (callable,args,kwargs) )
def test_job(id, sleep = 0.001 ):
html = ""
try:
time.sleep(1)
conn = urllib.urlopen('http://www.google.com/')
html = conn.read(20)
except:
print sys.exc_info()
return html
def test():
print 'start testing'
tp = ThreadPool(10)
for i in range(50):
time.sleep(0.2)
tp.add_job( test_job, i, i*0.001 )
tp.wait_for_complete()
#处理结果
print 'result Queue\'s length == %d '% tp.resultQueue.qsize()
while tp.resultQueue.qsize():
print tp.resultQueue.get()
print 'end testing'
if __name__ == '__main__':
test()
参考资料：http://blog.daviesliu.net/2006/10/09/234822/
http://hi.baidu.com/flowsing/blog/item/76cccbfbe1b76e214f4aeab8.html
http://www.ibm.com/developerworks/cn/aix/library/au-threadingpython/
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