pthon 執行緒之死鎖

這個是我們應該要避免出現的情況。

# !/usr/bin/python

# -*- coding:utf-8 -*- 
# ++++++++++++++++++++
# author: fmspider
# time: 2018-5-3 11:35
# function: 死鎖現象
import threading, time
class mythread(threading.thread):
def a(self):
locka.acquire()
print(self.name, 'gotlocka', time.ctime())
time.sleep(3)
lockb.acquire()
print(self.name, 'gotlockb', time.ctime())
lockb.release()
locka.release()
def b(self):
lockb.acquire()
print(self.name, 'gotlockb', time.ctime())
time.sleep(2)
locka.acquire()
print(self.name, 'gotlocka', time.ctime())
locka.release()
lockb.release()
def run(self):
self.a()
self.b()
if __name__ == '__main__':
locka = threading.lock()
lockb = threading.lock()
threads = 
for i in range(5):
for t in threads:
t.start()
for t in threads:
t.join() # 等待純種結果。

解決方法：

# !/usr/bin/python

# -*- coding:utf-8 -*- 
# ++++++++++++++++++++
# author: fmspider
# time: 2018-5-3 11:35
# function: 死鎖現象
import threading, time
class mythread(threading.thread):
def a(self):
lock.acquire()
print(self.name, 'gotlocka', time.ctime())
time.sleep(3)
lock.acquire()
print(self.name, 'gotlockb', time.ctime())
lock.release()
lock.release()
def b(self):
lock.acquire()
print(self.name, 'gotlockb', time.ctime())
time.sleep(2)
lock.acquire()
print(self.name, 'gotlocka', time.ctime())
lock.release()
lock.release()
def run(self):
self.a()
self.b()
if __name__ == '__main__':
# locka = threading.lock()
# lockb = threading.lock()
lock = threading.rlock()
threads = 
for i in range(5):
for t in threads:
t.start()
for t in threads:
t.join() # 等待純種結果。

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