Python多线程编程之threading模块详解

import threading


# 目标函数1
def fun1(num):
    for i in range(num):
        print('线程1: 第%d次循环:' % i)


# 目标函数2
def fun2(lst):
    for ele in lst:
        print('线程2: lst列表中元素 %d' % ele)


def main():
    num = 10
    # 实例化Thread对象
    # target参数一定为一个函数，且不带括号
    # args参数为元组类型，参数为一个时一定要加逗号
    t1 = threading.Thread(target=fun1, args=(num,))
    t2 = threading.Thread(target=fun2, args=([1, 2, 3, 4, 5],))

    # 调用start方法
    t1.start()
    t2.start()


if __name__ == '__main__':
    main()

import threading
import os


class Person(threading.Thread):
    def run(self):
        self.sing(5)
        self.cook()

    @staticmethod
    def sing(num):
        for i in range(num):
            print('线程[%d]: The person sing %d song.' % (os.getpid(), i))

    @staticmethod
    def cook():
        print('线程[%d]:The person has cooked breakfast.' % os.getpid())


def main():
    p1 = Person()
    p1.start()

    p2 = Person()
    p2.start()


if __name__ == '__main__':
    main()

import threading
import time
import logging


def fun1():
    print(threading.current_thread().getName(), 'starting')
    time.sleep(0.2)
    print(threading.current_thread().getName(), 'exiting')


def fun2():
    # print(threading.current_thread().getName(), 'starting')
    # time.sleep(0.3)
    # print(threading.current_thread().getName(), 'exiting')
    logging.debug('starting')
    time.sleep(0.3)
    logging.debug('exiting')


logging.basicConfig(
    level=logging.DEBUG,
    format='[%(levelname)s] (%(threadName)-10s) %(message)s'
)


def main():
    t1 = threading.Thread(name='线程1', target=fun1)
    t2 = threading.Thread(name='线程2', target=fun2)
    t1.start()
    t2.start()


if __name__ == '__main__':
    main()

import threading
import time
import logging


def daemon():
    logging.debug('starting')
    # 添加延时，此时主线程已经退出，exiting不会打印
    time.sleep(0.2)
    logging.debug('exiting')


def non_daemon():
    logging.debug('starting')
    logging.debug('exiting')


logging.basicConfig(
    level=logging.DEBUG,
    format='[%(levelname)s] (%(threadName)-10s) %(message)s'
)


def main():
    # t1 = threading.Thread(name='线程1', target=daemon)
    # t1.setDaemon(True)
    t1 = threading.Thread(name='线程1', target=daemon, daemon=True)
    t2 = threading.Thread(name='线程2', target=non_daemon)
    t1.start()
    t2.start()

    # 等待守护线程完成工作需要调用join()方法，默认情况join会无限阻塞，可以传入浮点值，表示超时时间
    t1.join(0.2)
    t2.join(0.1)


if __name__ == '__main__':
    main()

import threading
import time


g_num = 0


def fun1(num):
    global g_num
    for i in range(num):
        g_num += 1
    print('线程1 g_num = %d' % g_num)


def fun2(num):
    global g_num
    for i in range(num):
        g_num += 1
    print('线程2 g_num = %d' % g_num)


def main():
    t1 = threading.Thread(target=fun1, args=(1000000,))
    t2 = threading.Thread(target=fun1, args=(1000000,))
    t1.start()
    t2.start()


if __name__ == '__main__':
    main()
    time.sleep(1)
    print('主线程 g_num = %d' % g_num)

import threading
import time


g_num = 0
L = threading.Lock()


def fun1(num):
    global g_num
    L.acquire()
    for i in range(num):
        g_num += 1
    L.release()
    print('线程1 g_num = %d' % g_num)


def fun2(num):
    global g_num
    L.acquire()
    for i in range(num):
        g_num += 1
    L.release()
    print('线程2 g_num = %d' % g_num)


def main():
    t1 = threading.Thread(target=fun1, args=(1000000,))
    t2 = threading.Thread(target=fun1, args=(1000000,))
    t1.start()
    t2.start()


if __name__ == '__main__':
    main()
    time.sleep(1)
    print('主线程 g_num = %d' % g_num)

import threading
import time


g_num = 0
L1 = threading.Lock()
L2 = threading.Lock()


def fun1():
    L1.acquire(timeout=5)
    time.sleep(1)
    L2.acquire()
    print('产生死锁，并不会打印信息')
    L2.release()
    L1.release()


def fun2():
    L2.acquire(timeout=5)
    time.sleep(1)
    L1.acquire()
    print('产生死锁，并不会打印信息')
    L1.release()
    L2.release()


def main():
    t1 = threading.Thread(target=fun1)
    t2 = threading.Thread(target=fun2)
    t1.start()
    t2.start()


if __name__ == '__main__':
    main()
    time.sleep(1)
    print('主线程 g_num = %d' % g_num)

import threading
import time


g_num = 0
L1 = threading.Lock()
L2 = threading.Lock()


def fun1():
    L1.acquire()
    time.sleep(1)
    L2.acquire(timeout=5)
    print('超时异常打印信息1')
    L2.release()
    L1.release()


def fun2():
    L2.acquire()
    time.sleep(1)
    L1.acquire(timeout=5)
    print('超时异常打印信息2')
    L1.release()
    L2.release()


def main():
    t1 = threading.Thread(target=fun1)
    t2 = threading.Thread(target=fun2)
    t1.start()
    t2.start()


if __name__ == '__main__':
    main()
    time.sleep(1)
    print('主线程 g_num = %d' % g_num)