【Python】管道通訊和condition

標籤：send   cer   notify   main   python   open   join()   threading   pytho   

#練習：管道練習，雙工，單工,將受到的訊息儲存到檔案中import multiprocessing as mpfrom multiprocessing import Process,Lockdef write_file(content,lock,file_path="e:\\test40.txt"):    lock.acquire()    with open(file_path,"a+")as f1:        f1.write(content+"\n")    lock.release()def proc_1(pipe,lock):    pipe.send("hello")    write_file("hello",lock)    print ‘proc_1 received: %s‘ %pipe.recv()    pipe.send("what is your name?")    write_file("what is your name?",lock)    print ‘proc_1 received: %s‘ %pipe.recv()def proc_2(pipe,lock):    print ‘proc_2 received: %s‘ %pipe.recv()    pipe.send("hello,too")    write_file(‘hello, too‘,lock)    print ‘proc_2 received: %s‘ %pipe.recv()    pipe.send("I don‘t tell you!")    write_file("I don‘t tell you!",lock)if __name__=="__main__":    lock=Lock()    # 建立一個管道對象pipe    pipe=mp.Pipe()    print len(pipe)    #元群組類型    print type(pipe)    # 將第一個pipe對象傳給進程1    p1=mp.Process(target=proc_1,args=(pipe[0],lock))    # 將第二個pipe對象傳給進程2    p2=mp.Process(target=proc_2,args=(pipe[1],lock))    #這裡按理說應該是收的先啟起來，但這個例子裡p1和p2哪個先啟起來沒關係    p2.start()    p1.start()    p2.join()    p1.join()#練習：condition,notify_all通知所有，這個例子裡，有可能出現消費者收到訊息較快，比生產者訊息先列印出來的情況，如果使用notify()，就需要有幾個進程就寫幾個notify()import multiprocessing as mpimport threadingimport timedef consumer(cond):    with cond:        print("consumer before wait")        #等待消費        cond.wait()        print("consumer after wait")def producer(cond):    with cond:        print("producer before notifyAll")        # 通知消費者可以消費了        cond.notify_all()        print("producer after notifyAll")if __name__=="__main__":    condition=mp.Condition()    p1=mp.Process(name="p1",target=consumer,args=(condition,))    p2=mp.Process(name="p2",target=consumer,args=(condition,))    p3=mp.Process(name="p3",target=producer,args=(condition,))    p1.start()    time.sleep(2)    p2.start()    time.sleep(2)    p3.start()

 

【Python】管道通訊和condition