from multiprocessing import Process
def work():
print('hello')
if __name__ == '__main__':
#在主进程下开启子进程
p=Process(target=work)
p.start()
print('主线程/主进程')
from threading import Thread
import os
def work():
print('hello',os.getpid())
if __name__ == '__main__':
t1=Thread(target=work)
t2=Thread(target=work)
t1.start()
t2.start()
print('主线程/主进程pid',os.getpid())
执行结果
hello 7939
hello 7939
主线程/主进程 7939
2、开多个进程,每个进程都有不同的pid
from multiprocessing import Process
import os
def work():
print('hello',os.getpid())
if __name__ == '__main__':
p1=Process(target=work)
p2=Process(target=work)
p1.start()
p2.start()
print('主线程/主进程',os.getpid())
执行结果
主线程/主进程 7951
hello 7952
hello 7953
三 同一进程内的线程共享该进程的数据?
1、进程之间地址空间是隔离的
from multiprocessing import Process
import os
def work():
global n
n=0
if __name__ == '__main__':
n=100
p=Process(target=work)
p.start()
p.join()
print('主',n)