python多線程編程(3): 死結和可重新進入鎖

來源:互聯網
上載者:User

標籤:

死結

線上程間共用多個資源的時候,如果兩個線程分別佔有一部分資源並且同時等待對方的資源,就會造成死結。儘管死結很少發生,但一旦發生就會造成應用的停止回應。下面看一個死結的例子:

按 Ctrl+C 複製代碼按 Ctrl+C 複製代碼

執行結果:

Thread-1 got resA
Thread-1 got resB
Thread-1 got resB
Thread-1 got resA
Thread-2 got resA
Thread-2 got resB
Thread-2 got resB
Thread-2 got resA
Thread-3 got resA
Thread-3 got resB
Thread-3 got resB
Thread-3 got resA
Thread-5 got resA
Thread-5 got resB
Thread-5 got resB
Thread-4 got resA

此時進程已經死掉。

可重新進入鎖

更簡單的死結情況是一個線程“迭代”請求同一個資源,直接就會造成死結:

import threading
import time

class MyThread(threading.Thread):
def run(self):
global num
time.sleep(1)

if mutex.acquire(1):
num = num+1
msg = self.name+‘ set num to ‘+str(num)
print msg
mutex.acquire()
mutex.release()
mutex.release()
num = 0
mutex = threading.Lock()
def test():
for i in range(5):
t = MyThread()
t.start()
if __name__ == ‘__main__‘:
test()

為了支援在同一線程中多次請求同一資源,python提供了“可重新進入鎖”:threading.RLock。RLock內部維護著一個Lock和一個counter變數,counter記錄了acquire的次數,從而使得資源可以被多次require。直到一個線程所有的acquire都被release,其他的線程才能獲得資源。上面的例子如果使用RLock代替Lock,則不會發生死結:

import threading
import time

class MyThread(threading.Thread):
def run(self):
global num
time.sleep(1)

if mutex.acquire(1):
num = num+1
msg = self.name+‘ set num to ‘+str(num)
print msg
mutex.acquire()
mutex.release()
mutex.release()
num = 0
mutex = threading.RLock()
def test():
for i in range(5):
t = MyThread()
t.start()
if __name__ == ‘__main__‘:
test()

執行結果:

Thread-1 set num to 1
Thread-3 set num to 2
Thread-2 set num to 3
Thread-5 set num to 4
Thread-4 set num to 5

python多線程編程(3): 死結和可重新進入鎖

相關文章

聯繫我們

該頁面正文內容均來源於網絡整理,並不代表阿里雲官方的觀點,該頁面所提到的產品和服務也與阿里云無關,如果該頁面內容對您造成了困擾,歡迎寫郵件給我們,收到郵件我們將在5個工作日內處理。

如果您發現本社區中有涉嫌抄襲的內容,歡迎發送郵件至: info-contact@alibabacloud.com 進行舉報並提供相關證據,工作人員會在 5 個工作天內聯絡您,一經查實,本站將立刻刪除涉嫌侵權內容。

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.