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

from threading import Thread,Lock

g_num = 0

def test1():
    global g_num
    #上锁
    mutex.acquire()
    for i in range(100000):
        g_num +=1
    #解锁
    mutex.release()

    print("test1----g_num= %d"%g_num)

def test2():
    global g_num
    #上锁
    mutex.acquire()
    for i in range(100000):
        g_num += 1
    #解锁
    mutex.release()
    print("test2----g_num = %d"%g_num)


# 创建互斥锁
mutex = Lock()
p1 = Thread(target = test1)
p1.start()

p2 = Thread(target = test2)
p2.start()

p1.join()
p2.join()

print("---g_num---%d"%g_num)

执行结果

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