PYTHON多线程实践-初级到到高级

多线程样例:

import threading
import time

def run(name):
    print "i am mult-threding",i
    time.sleep(2)
for i in range(20):
    t=threading.Thread(target=run,args=(i,))
    t.start()
 
class mythread(threading.Thread):
    def __init__(self,num):
        threading.Thread.__init__(self)
        self.num=num
    def run(self):
        print "i am thread %s"% self.num
        time.sleep(2)
        print "OK"
for i in range(20):
    t=mythread(i)
    t.start()

###

通过RLOCK方式，解决多线程之间修改共享对象不出问题，使线程的资源独占

import threading
import time
lock=threading.Rlock()
def run(name):
    lock.acquire()
    print "i am mult-threding",i
    lock.release()
    time.sleep(2)
for i in range(20):
    t=threading.Thread(target=run,args=(i,))
    t.start()

###连接池

#!/usr/bin/env python

from multiprocessing import Pool

import time

def sayHi(a):

        time.sleep(5)

        return a**a

if __name__ =="__main__":

        p=Pool(processes=5)

        result=p.apply_async(sayHi,[10])

        print result.get()

一个池子启用5个线程池，且异步一次返回结果

可以用for循环使用多次异步：

#!/usr/bin/env python

from multiprocessing import Pool

import time

def sayHi(a):

        time.sleep(5)

        return a**a

p=Pool(processes=5)

result_list=[]

for i in range(100):

        result_list.append(p.apply_async(sayHi,[i]))

for j in result_list:

        print j.get()