线程_可能发生的问题

from threading import Thread
g_num = 0
def test1():
    global g_num
    for i in range(1000000):
        g_num += 1
    print("---test1---g_num=%d"%g_num)
def test2():
    global g_num
    for i in range(1000000):
        g_num += 1
    print("---test2---g_num=%d"%g_num)
p1 = Thread(target=test1)
p1.start()
# time.sleep(3)

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

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

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内存泄漏

import gc
class ClassA():
    def __init__(self):
        print('对象产生 id:%s'%str(hex(id(self))))
def f2():
    while True:
        c1 = ClassA()
        c2 = ClassA()
        c1.t = c2#引用计数变为2
        c2.t = c1
        del c1#引用计数变为1  0才进行回收
        del c2
#把python的gc关闭
gc.disable()
f2()

---

2020-05-07