Child process in Python concurrency

date: 2019-06-16   22:35:33

author: headsen chen

notice: personal original

 

Example code:

import os,time
time.sleep(1)
from multiprocessing import Process
a = 100
print(a,os.getpid(),os.getppid(),"开始执行")
def func(i):
    print("i = %s,子进程id >>> %s,父进程id >>> %s."%(i,os.getpid(),os.getppid()))
if __name__ == "__main__":
    for i in range(3):
        p=Process(target=func,args=(i,))
        p.start()
        A + = 222
         Print (A, " concurrency " ) 
the time.sleep ( 10 )
 Print (A, os.getpid (), os.getppid (), " ends execution " )

Results of the:

" C: \ Program Files \ Python36 \ python.exe " E: / job / Chen Reserve soldiers -L009- Code practice 1.py
 100 8656 5412 started
 322 concurrent in
 544 concurrent in
 766 concurrency
 10,066,888,656 started
 10,052,648,656 start execution
 10,059,008,656 started
 76,686,565,412 end of the implementation
 10,066,888,656 end of the implementation
 10,052,648,656 end of the implementation
 10,059,008,656 end the execution of 
i = 0, the child process id >>> 6688, >>> 8656 the parent process the above mentioned id . 
i = 1, child process id >>> 5264, >>> 8656 the parent process the above mentioned id . 
i = 2, the child process id >>> 5900, >>> 8656 the parent process the above mentioned id .

Process finished with exit code 0