多线程使用互斥锁

线程同步能够保证多个线程安全访问竞争资源，最简单的同步机制是引入互斥锁

 1 from threading import Thread,Lock
 2 
 3 g_num = 0
 4 
 5 def test1():
 6     global g_num
 7     #上锁
 8     mutex.acquire()
 9     for i in range(100000):
10         g_num +=1
11     #解锁
12     mutex.release()
13 
14     print("test1----g_num= %d"%g_num)
15 
16 def test2():
17     global g_num
18     #上锁
19     mutex.acquire()
20     for i in range(100000):
21         g_num += 1
22     #解锁
23     mutex.release()
24     print("test2----g_num = %d"%g_num)
25 
26 
27 # 创建互斥锁
28 mutex = Lock()
29 p1 = Thread(target = test1)
30 p1.start()
31 
32 p2 = Thread(target = test2)
33 p2.start()
34 
35 p1.join()
36 p2.join()
37 
38 print("---g_num---%d"%g_num)

执行结果

test1----g_num= 100000
test2----g_num = 200000
---g_num---200000