进程之锁,信息量,事件,队列,生产者消费者模型,joinablequeue

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<br>#锁 import os ,random,time,json from multiprocessing import Process,Lock def qiangPiao(i):     with open('ticket','r+',encoding='utf-8')as f:         ticket_info_dic=json.load(f)         if ticket_info_dic['count']>0:             ticket_info_dic['count']-=1             # f.write(json.dumps(ticket_info_dic))             f.seek(0)             json.dump(ticket_info_dic,f)             print('"id":%s "i:"%s 抢到票了 '%(os.getpid(),i))         else:             print('%s没票了'%i)   class myProcess(Process):     def __init__(self,i,lock):         super().__init__()         self.i=i         self.lock=lock       def run(self):         time.sleep(random.random())         self.lock.acquire()         qiangPiao(self.i)         self.lock.release()     if __name__ == '__main__':     with open('ticket','w',encoding='utf-8')as f:         f.write('{"count":1}')     lock=Lock()     for i in range(9):         p=myProcess(i,lock)         p.start()

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#信息量 import time,random from multiprocessing import Process,Semaphore   def xijiao(i):     print('%s号洗脚'%i)     time.sleep(random.randrange(1,3)) class myProcess(Process):     def __init__(self,i,s):         super(myProcess, self).__init__()         self.i=i         self.s=s     def run(self):         self.s.acquire()         xijiao(self.i)         self.s.release() if __name__ == '__main__':     s=Semaphore(2)#信号量     for i in range(10):         p=myProcess(i,s)         p.start()

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#事件 def honglvdeng(e):     while 1:         print('红灯')         time.sleep(3)         e.set()         print('绿灯')         time.sleep(3)         e.clear()   def car(e,i):     if not e.is_set():         print('%s等待...'%i)     e.wait()     print('%s走你'%i)   if __name__ == '__main__':     e=Event()     l=Process(target=honglvdeng,args=(e,))     l.start()     for i in range(3):         p=Process(target=car,kwargs={'e':e,'i':i})         p.start()

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#队列 import time from multiprocessing import Process,Queue # q=Queue(3) # q.put(1) # q.put(2) # q.put(3) # print('满:',q.full())#判断一个队列是否满了,不可靠 # # q.put(4)#阻塞 # print(q.get()) # print(q.get()) # print(q.get()) #print(q.qsize())#获取当前队列有多少个值,不可靠 # # print(q.get())#阻塞 # print('空:',q.empty())#判断一个队列是否为空,不可靠 # try: #     q.get(False)# #     q.get_nowait()#与q.get(False)一样 # except Exception as e: #     print('队列空了')       def boy(q):     q.put('约吗?') def g(q):     print('boy:',q.get())     time.sleep(1)     print('领导:',q.get()) if __name__ == '__main__':     q=Queue(4)     p1 = Process(target=boy, args=(q,))     p1.start()     p=Process(target=g,args=(q,))     p.start()     time.sleep(1)     q.put('不要乱搞')

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#生产者消费者模型 import time from multiprocessing import Process,Queue   def makeBaozi(q):     for i in range(1,11):         time.sleep(1)         q.put('%s号包子'%i)         print('生产%s号包子'%i)     def chiBaozi(q):     while 1:         time.sleep(2)         bao=q.get()         if bao==None:             break         print('吃%s'%bao) if __name__ == '__main__':     q=Queue(20)     p1=Process(target=makeBaozi,args=(q,))     p1.start()     p2=Process(target=chiBaozi,args=(q,))     p2.start()     p1.join()#主进程等待进程p1结束     q.put(None)

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#生产者消费者模型,joinablequeue import time from multiprocessing import Process,JoinableQueue   def makeBaozi(q):     for i in range(1,11):         time.sleep(1)         q.put('%s号包子'%i)         print('生产%s号包子'%i)     q.join()     print('吃完了') def chiBaozi(q):     while 1:         time.sleep(2)         bao=q.get()         print('吃%s'%bao)         q.task_done()#发送执行完一次 if __name__ == '__main__':     q=JoinableQueue(20)#创建一个joinablequeue对象     p1=Process(target=makeBaozi,args=(q,))     p1.start()     p2=Process(target=chiBaozi,args=(q,))     p2.daemon=True#给p2进程添加守护跟随主进程一起结束     p2.start()     p1.join()#主进程等待进程p1结束     print('主进程结束')