# 死锁
from threading import Thread,Lock
import timemutexA = Lock()
mutexB = Lock()class MyThread(Thread):def run(self):self.f1()self.f2()def f1(self):mutexA.acquire()print('%s 拿到了A锁' %self.name)mutexB.acquire()print('%s 拿到了B锁' % self.name)mutexB.release()mutexA.release()def f2(self):mutexB.acquire()print('%s 拿到了B锁' % self.name)time.sleep(0.1)mutexA.acquire()print('%s 拿到了A锁' % self.name)mutexB.release()mutexA.release()if __name__ == '__main__':for i in range(10):t=MyThread()t.start()
'''
打印结果:
Thread-1 拿到了A锁
Thread-1 拿到了B锁
Thread-1 拿到了B锁
Thread-2 拿到了A锁
'''

#互斥锁只能acquire一次
from threading import Thread,Lock
mutexA = Lock()
mutexA.acquire()
mutexA.release()#递归锁:可以连续acquire多次，每acquier一次计数器就+1，只有计数为0时，才能被其他线程强到
from threading import Thread,RLock
import timemutexB = mutexA = RLock()class MyThread(Thread):def run(self):self.f1()self.f2()def f1(self):mutexA.acquire()print('%s 拿到了A锁' %self.name)mutexB.acquire()print('%s 拿到了B锁' % self.name)mutexB.release()mutexA.release()def f2(self):mutexB.acquire()print('%s 拿到了B锁' % self.name)time.sleep(2)mutexA.acquire()print('%s 拿到了A锁' % self.name)mutexB.release()mutexA.release()if __name__ == '__main__':for i in range(10):t=MyThread()t.start()
'''
打印结果：
Thread-1 拿到了A锁
Thread-1 拿到了B锁
Thread-1 拿到了B锁
Thread-1 拿到了A锁
Thread-2 拿到了A锁
Thread-2 拿到了B锁
Thread-2 拿到了B锁
Thread-2 拿到了A锁
Thread-4 拿到了A锁
Thread-4 拿到了B锁
Thread-4 拿到了B锁
Thread-4 拿到了A锁
Thread-6 拿到了A锁
Thread-6 拿到了B锁
Thread-6 拿到了B锁
Thread-6 拿到了A锁
Thread-8 拿到了A锁
Thread-8 拿到了B锁
Thread-8 拿到了B锁
Thread-8 拿到了A锁
Thread-10 拿到了A锁
Thread-10 拿到了B锁
Thread-10 拿到了B锁
Thread-10 拿到了A锁
Thread-5 拿到了A锁
Thread-5 拿到了B锁
Thread-5 拿到了B锁
Thread-5 拿到了A锁
Thread-9 拿到了A锁
Thread-9 拿到了B锁
Thread-9 拿到了B锁
Thread-9 拿到了A锁
Thread-7 拿到了A锁
Thread-7 拿到了B锁
Thread-7 拿到了B锁
Thread-7 拿到了A锁
Thread-3 拿到了A锁
Thread-3 拿到了B锁
Thread-3 拿到了B锁
Thread-3 拿到了A锁
'''

from threading import Thread,Semaphore,currentThread
import time,randomsm=Semaphore(3) #厕所的坑def task():# sm.acquire()# print('%s in' %currentThread.getName())# sm.release()
    with sm:print('%s in' %currentThread().getName())time.sleep(random.randint(2,3))if __name__ == '__main__':for i in range(10):t=Thread(target=task)t.start()
'''
打印结果：
Thread-1 in
Thread-2 in
Thread-3 inThread-4 inThread-5 in
Thread-6 inThread-7 inThread-9 in
Thread-8 in
Thread-10 in
'''

from threading import Thread,Event
import timeevent = Event()
# event.wait() 在原地等,指导执行到event.set()
# event.set() 等待结束def student(name):print('学生%s 正在听课' %name)event.wait(2)print('学生%s 课间活动' %name)def teacher(name):print('老师%s 正在授课' %name)time.sleep(5)event.set()if __name__ == '__main__':stu1 = Thread(target=student,args=('alex',))stu2 = Thread(target=student,args=('yang',))stu3 = Thread(target=student,args=('hang',))tea1 = Thread(target=teacher,args=('ding',))stu1.start()stu2.start()stu3.start()tea1.start()
'''
打印结果：
学生alex 正在听课
学生yang 正在听课
学生hang 正在听课
老师ding 正在授课
学生hang 课间活动
学生yang 课间活动
学生alex 课间活动
'''#设置连接的超时时间
from threading import Thread,Event,currentThread
import timeevent = Event()def conn():n=0while not event.is_set():if n == 3:print('%s try too many' %currentThread().getName())returnprint('%s try %s' %(currentThread().getName(),n))event.wait(0.5)n+=1print('%s is connecting' %currentThread().getName())def check():print('%s is checking' %currentThread().getName())time.sleep(5)event.set()if __name__ == '__main__':for i in range(3):t=Thread(target=conn)t.start()t=Thread(target=check)t.start()
'''
打印结果：
Thread-1 try 0
Thread-2 try 0
Thread-3 try 0
Thread-4 is checking
Thread-1 try 1
Thread-3 try 1
Thread-2 try 1
Thread-1 try 2
Thread-3 try 2
Thread-2 try 2
Thread-1 try too many
Thread-3 try too many
Thread-2 try too many
'''

# from  threading import Timer
#
# def task(name):
#     print('hello %s' %name)
#
# t=Timer(5,task,args=('egon',))
# t.start()#验证码
from threading import Timer
import randomclass Code:def __init__(self):self.make_cache()def make_cache(self,interval=60):self.cache = self.make_code()print(self.cache)self.t = Timer(interval,self.make_cache)self.t.start()def make_code(self,n=4):res=''for i in range(n):s1 = str(random.randint(0,9))s2 = chr(random.randint(65,90))res+=random.choice([s1,s2])return resdef check(self):while True:code = input('输入你的验证码>>: ').strip()if code.upper() == self.cache:print('验证码输入正确')self.t.cancel()breakobj=Code()
obj.check()'''
打印结果:
X095
输入你的验证码>>: X095
验证码输入正确
'''