Python多執行緒學習

一．建立執行緒

1．通過thread模組中的start_new_thread(func,args)建立執行緒：

在eclipse+pydev中敲出以下**：

# -*- coding: utf-8 -*- 

import thread  
def run_thread(n):  
for i in range(n):  
print i  
thread.start_new_thread(run_thread,(4,)) #引數一定是元組，兩個引數可以寫成（a,b）

unhandled exception in thread started by 

sys.excepthook is missing
lost sys.stderr

>>> import thread

>>> def run(n):
for i in range(n):
print i
>>> thread.start_new_thread(run,(4,))
98520
1>>> 
23

# -*- coding: utf-8 -*- 

'''created on 2012-8-8
@author: jeromewei
'''   
from threading import thread
import time
class race(thread):
def __init__(self,threadname,interval):
thread.__init__(self,name=threadname)
self.interval = interval
self.isrunning = true
def run(self):       #重寫threading.thread中的run()
while self.isrunning:
print 'thread %s is running,time:%s\n' %(self.getname(),time.ctime()) #獲得執行緒的名稱和當前時間
time.sleep(self.interval)
def stop(self):
self.isrunning = false
def test():
thread1 = race('a',1)
thread2 = race('b',2)
thread1.start()
thread2.start()
time.sleep(5)
thread1.stop()
thread2.stop()
if __name__ =='__main__':
test()

# -*- coding: utf-8 -*- 

from threading import thread  
def run_thread(n):  
for i in range(n):  
print i  
t1 = thread(target=run_thread,args=(5,))#指定目標函式，傳入引數，這裡引數也是元組
t1.start()  #啟動執行緒

函式名

功能run()

如果採用方法2建立執行緒就需要重寫該方法

getname()

獲得執行緒的名稱(方法2中有示例)

setname()

設定執行緒的名稱

start()

啟動執行緒

join(timeout)

在join()位置等待另一線程結束後再繼續執行join()後的操作,timeout是可選項，表示最大等待時間

setdaemon(bool)

true:當父執行緒結束時，子執行緒立即結束；false:父執行緒等待子執行緒結束後才結束。預設為false

isdaemon()

判斷子執行緒是否和父執行緒一起結束，即setdaemon()設定的值

isalive()

判斷執行緒是否在執行

以上方法中，我將對join()和setdaemon(bool)作著重介紹，示例如下：

（1）join方法：

# -*- coding: utf-8 -*- 

import threading  
import time     #匯入time模組  
class mythread(threading.thread):  
def __init__(self,threadname):  
threading.thread.__init__(self,name = threadname)  
def run(self):  
time.sleep(2) 
for i in range(5):
print '%s is running····'%self.getname()  
t2 = mythread('b')  
t2.start()
#t2.join()     
for i in range(5):
print 'the program is running···'

the program is running···

the program is running···
the program is running···
b is running····
b is running····
b is running····

b is running····

b is running····
b is running····
the program is running···
the program is running···
the program is running···

# -*- coding: utf-8 -*- 

import threading
import time 
class mythread(threading.thread):
def __init__(self, threadname):
threading.thread.__init__(self, name=threadname)
def run(self):
time.sleep(5)
print '%s is running·······done'%self.getname()
t=mythread('son thread')
#t.setdaemon(true)
t.start()
if t.isdaemon():
print "the father thread and the son thread are done"
else:
print "the father thread is waiting the son thread····"

the father thread is waitting the son thread····

son thread is running·······done

the father thread and the son thread are done

介紹到這裡，python多執行緒使用級別的知識點已全部介紹完了，下面我會分析一下python多執行緒的同步問題。

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