须要的！
为什么呢，以 python 的第三方协程实现 eventlet 为例子
看上面的代码：
from loguru import loggerimport eventlet# from eventlet.lock import Lock# eventlet.monkey_patch()var = 0def foo(i): global var if var < 10: eventlet.sleep(1) var += 1pool = eventlet.GreenPool()for body in pool.imap(foo, [i for i in range(100)]): passlogger.debug(f'最初的 {var}')输入后果：
╰─➤ time python -u "/Users/ponponon/Desktop/code/me/ideaboom/test_evenetlet/need_lock_with_sleep.py"2022-06-29 23:33:03.015 | DEBUG | __main__:<module>:23 - 最初的 100python -u 0.24s user 0.06s system 20% cpu 1.439 total应用了锁之后，就失常了
from loguru import loggerimport eventletfrom eventlet.lock import Lock# eventlet.monkey_patch()var = 0lock=Lock()def foo(i): global var with lock: if var < 10: eventlet.sleep(1) var += 1pool = eventlet.GreenPool()for body in pool.imap(foo, [i for i in range(100)]): passlogger.debug(f'最初的 {var}')输入后果：
╰─➤ time python -u "/Users/ponponon/Desktop/code/me/ideaboom/test_evenetlet/need_lock_with_sleep.py" 2022-06-29 23:31:35.865 | DEBUG | __main__:<module>:25 - 最初的 10python -u 0.27s user 0.04s system 2% cpu 10.351 total