本文實例講述了python避免死鎖方法。分享給大家供大家參考。具體分析如下：

當兩個或者更多的線程在等待資源的時候就會產生死鎖，兩個線程相互等待。

在本文實例中 thread1 等待thread2釋放block , thread2等待thtead1釋放ablock，

避免死鎖的原則：

1. 一定要以一個固定的順序來取得鎖，這個列子中，意味著首先要取得alock, 然后再去block

2. 一定要按照與取得鎖相反的順序釋放鎖，這里，應該先釋放block,然后是alock

import threading ,time

a = 5

alock = threading.Lock()

b = 5

block = threading.Lock()

def thread1calc():

print "thread1 acquiring lock a"

alock.acquire()

time.sleep(5)

print "thread1 acquiring lock b"

block.acquire()

a+=5

b+=5

print "thread1 releasing both locks"

block.release()

alock.release()

def thread2calc():

print "thread2 acquiring lock b"

block.acquire()

time.sleep(5)

print "thread2 acquiring lock a"

alock.acquire()

time.sleep(5)

a+=10

b+=10

print "thread2 releasing both locks"

block.release()

alock.release()

t = threading.Thread(target = thread1calc)

t.setDaemon(1)

t.start()

t = threading.Thread(target = thread2calc)

t.setDaemon(2)

t.start()

while 1:

time.sleep(300)

輸出：

thread1 acquiring lock a

thread2 acquiring lock b

thread1 acquiring lock b

thread2 acquiring lock a

希望本文所述對大家的Python程序設計有所幫助。

本文標題: python避免死鎖方法實例分析

本文地址: http://www.cppcns.com/jiaoben/python/125900.html

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