[python | Thread] multi-threaded recording

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https://blog.csdn.net/weixin_39190382?type=blog

0. Preface

Python multithreaded recording

Explanation: Due to the existence of GIL lock, it is not multi-threaded in the true sense

1. Text

1.1 Using multithreading for functions

from threading import Thread
from time import sleep, ctime

def func(name, sec):
    print('---开始---', name, '时间', ctime())
    sleep(sec)
    print('***结束***', name, '时间', ctime())

# 创建 Thread 实例
t1 = Thread(target=func, args=('第一个线程', 1))
t2 = Thread(target=func, args=('第二个线程', 2))

# 启动线程运行
t1.start()
t2.start()

# 等待所有线程执行完毕
t1.join()  # join() 等待线程终止，要不然一直挂起
t2.join()

1.2 Using multithreading with classes

from threading import Thread
from time import sleep, ctime


class MyClass(object):

    def func(self,name,sec):
        print('---开始---', name, '时间', ctime())
        sleep(sec)
        print('***结束***', name, '时间', ctime())

def main():
    # 创建 Thread 实例
    t1 = Thread(target=MyClass().func, args=(1, 1))
    t2 = Thread(target=MyClass().func, args=(2, 2))

    # 启动线程运行
    t1.start()
    t2.start()

    # 等待所有线程执行完毕
    t1.join()  # join() 等待线程终止，要不然一直挂起
    t2.join()

if __name__=="__main__":
    main()

1.3 Inherited way to use multithreading

Description:
Rewrite the run method in the Thread class, write the code you need to execute in it, and then use the start() method to call run

from threading import Thread
from time import sleep, ctime

# 创建 Thread 的子类
class MyThread(Thread):
    def __init__(self, func, args):
        '''
        :param func: 可调用的对象
        :param args: 可调用对象的参数
        '''
        Thread.__init__(self)
        self.func = func
        self.args = args
        self.result = None

    def run(self):
        self.result = self.func(*self.args)

    def getResult(self):
        return self.result


def func(name, sec):
    print('---开始---', name, '时间', ctime())
    sleep(sec)
    print('***结束***', name, '时间', ctime())
    return sec


def main():
    # 创建 Thread 实例
    t1 = MyThread(func, (1, 1))
    t2 = MyThread(func, (2, 2))
    # 启动线程运行
    t1.start()
    t2.start()
    # 等待所有线程执行完毕
    t1.join()
    t2.join()
    # 或线程中程序的运行结果
    print(t1.getResult())
    print(t2.getResult())


if __name__ == '__main__':
    main()

reference

[1] https://zhuanlan.zhihu.com/p/91601448
[2] https://zhuanlan.zhihu.com/p/106905974