请解释什么是线程锁，以及如何使用线程锁

线程锁: 目的是将一段代码锁住，一旦获得锁权限，除非释放线程锁，否则其他任何代码都无法获得锁权限
为什么需要线程锁
- 多线程同时在完成特定的操作时，由于并不是原子操作，所以在完成操作的过程中可能会被打断，去做其他的操作
- 可能产生脏数据
- 例如，一个线程读取变量n 【初始值是0】，然后n++, 最后输出n，当访问n++后，被打断，由另外的线程做同样的工作，这时n被加了2次，所以n最后等于2，而不是1

from atexit import register
from threading import Thread, Lock, currentThread
from time import sleep, ctime
import random

lock = Lock()
print(type(lock))

def fun():
    lock.acquire()  # 加锁
    for i in range(5):
        print('Thread Name', '=', currentThread().name, 'i', '=', i)
        sleep(random.randint(1, 5))
    lock.release()  # 释放锁
    
def main():
    for i in range(3):
        Thread(target=fun).start()
        
@register
def exit():
    print('线程执行完毕: ', ctime())
    
main()

<class '_thread.lock'>

Thread Name = Thread-13 i = 0

Thread Name = Thread-13 i = 1

Thread Name = Thread-13 i = 2

Thread Name = Thread-13 i = 3

Thread Name = Thread-13 i = 4

Thread Name = Thread-14 i = 0

Thread Name = Thread-14 i = 1

Thread Name = Thread-14 i = 2

Thread Name = Thread-14 i = 3

Thread Name = Thread-14 i = 4

Thread Name = Thread-15 i = 0

Thread Name = Thread-15 i = 1

Thread Name = Thread-15 i = 2

Thread Name = Thread-15 i = 3

Thread Name = Thread-15 i = 4

from atexit import register
from threading import Thread, Lock, currentThread
from time import sleep, ctime
import random

lock = Lock()
print(type(lock))

def fun():
    # lock.acquire()  # 加锁
    for i in range(5):
        print('Thread Name', '=', currentThread().name, 'i', '=', i)
        sleep(random.randint(1, 5))
    # lock.release()  # 释放锁
    
def main():
    for i in range(3):
        Thread(target=fun).start()
        
@register
def exit():
    print('线程执行完毕: ', ctime())
    
main()

<class '_thread.lock'>

Thread Name = Thread-16 i = 0

Thread Name = Thread-17 i = 0

Thread Name = Thread-18 i = 0

Thread Name = Thread-16 i = 1

Thread Name = Thread-17 i = 1

Thread Name = Thread-18 i = 1

Thread Name = Thread-17 i = 2

Thread Name = Thread-16 i = 2

Thread Name = Thread-17 i = 3

Thread Name = Thread-18 i = 2

Thread Name = Thread-18 i = 3

Thread Name = Thread-18 i = 4

Thread Name = Thread-17 i = 4

Thread Name = Thread-16 i = 3

Thread Name = Thread-16 i = 4

知识分享 – 65 – 请解释什么是线程锁，以及如何使用线程锁

请解释什么是线程锁，以及如何使用线程锁