Python中的进程操作模块(multiprocess.process)_python_

import time from multiprocessing import Process def f(name): print('hello', name) time.sleep(1) print('我是子进程') if __name__ == '__main__': p = Process(target=f, args=('bob',)) p.start() # p.join() print('我是父进程')

import os from multiprocessing import Process def f(x): print('子进程id ：',os.getpid(),'父进程id ：',os.getppid()) return x*x if __name__ == '__main__': print('主进程id ：', os.getpid()) p_lst = [] for i in range(5): p = Process(target=f, args=(i,)) p.start()

import time from multiprocessing import Process def f(name): print('hello', name) time.sleep(1) if __name__ == '__main__': p_lst = [] for i in range(5): p = Process(target=f, args=('bob',)) p.start() p_lst.append(p) p.join() # [p.join() for p in p_lst] print('父进程在执行')

import os from multiprocessing import Process class MyProcess(Process): def __init__(self,name): super().__init__() self.name=name def run(self): print(os.getpid()) print('%s 正在和女主播聊天' %self.name) p1=MyProcess('wupeiqi') p2=MyProcess('yuanhao') p3=MyProcess('nezha') p1.start() # start会自动调用run p2.start() # p2.run() p3.start() p1.join() p2.join() p3.join() print('主线程')

from multiprocessing import Process def work(): global n n=0 print('子进程内: ',n) if __name__ == '__main__': n = 100 p=Process(target=work) p.start() print('主进程内: ',n)

import os import time from multiprocessing import Process class Myprocess(Process): def __init__(self,person): super().__init__() self.person = person def run(self): print(os.getpid(),self.name) print('%s正在和女主播聊天' %self.person) p=Myprocess('哪吒') p.daemon=True # 一定要在p.start()前设置,设置p为守护进程,禁止p创建子进程,并且父进程代码执行结束,p即终止运行 p.start() time.sleep(10) # 在sleep时查看进程id对应的进程ps -ef|grep id print('主')

from multiprocessing import Process def foo(): print(123) time.sleep(1) print("end123") def bar(): print(456) time.sleep(3) print("end456") p1=Process(target=foo) p2=Process(target=bar) p1.daemon=True p1.start() p2.start() time.sleep(0.1) print("main-------") # 打印该行则主进程代码结束,则守护进程p1应该被终止.#可能会有p1任务执行的打印信息123,因为主进程打印main----时,p1也执行了,但是随即被终止，p2可以打印出来。

from socket import * from multiprocessing import Process server=socket(AF_INET,SOCK_STREAM) server.setsockopt(SOL_SOCKET,SO_REUSEADDR,1) server.bind(('127.0.0.1',8080)) server.listen(5) def talk(conn,client_addr): while True: try: msg=conn.recv(1024) if not msg:break conn.send(msg.upper()) except Exception: break if __name__ == '__main__': # windows下start进程一定要写到这下面 while True: conn,client_addr=server.accept() p=Process(target=talk,args=(conn,client_addr))

from multiprocessing import Process import time import random class Myprocess(Process): def __init__(self,person): self.name=person super().__init__() def run(self): print('%s正在和网红脸聊天' %self.name) time.sleep(random.randrange(1,5)) print('%s还在和网红脸聊天' %self.name) p1=Myprocess('哪吒') p1.start() p1.terminate()#关闭进程,不会立即关闭,所以is_alive立刻查看的结果可能还是存活 print(p1.is_alive()) #结果为True print('开始') print(p1.is_alive()) #结果为False

class Myprocess(Process): def __init__(self,person): self.name=person # name属性是Process中的属性，标示进程的名字 super().__init__() # 执行父类的初始化方法会覆盖name属性 # self.name = person # 在这里设置就可以修改进程名字了 # self.person = person # 如果不想覆盖进程名，就修改属性名称就可以了 def run(self): print('%s正在和网红脸聊天' %self.name) # print('%s正在和网红脸聊天' %self.person) time.sleep(random.randrange(1,5)) print('%s正在和网红脸聊天' %self.name) # print('%s正在和网红脸聊天' %self.person) p1=Myprocess('哪吒') p1.start() print(p1.pid) #可以查看子进程的进程id