python进程的状态、创建及使用方法详解

# -*- coding:utf-8 -*-
from multiprocessing import Process
import time
def run_proc():
  """子进程要执行的代码"""
  while True:
    print("----2----")
    time.sleep(1)
if __name__=='__main__':
  p = Process(target=run_proc)
  p.start()
  while True:
    print("----1----")
    time.sleep(1)

# -*- coding:utf-8 -*-
from multiprocessing import Process
import os
import time
def run_proc():
  """子进程要执行的代码"""
  print('子进程运行中，pid=%d...' % os.getpid()) # os.getpid获取当前进程的进程号
  print('子进程将要结束...')
if __name__ == '__main__':
  print('父进程pid: %d' % os.getpid()) # os.getpid获取当前进程的进程号
  p = Process(target=run_proc)
  p.start()

# -*- coding:utf-8 -*-
from multiprocessing import Process
import os
from time import sleep
def run_proc(name, age, **kwargs):
  for i in range(10):
    print('子进程运行中，name= %s,age=%d ,pid=%d...' % (name, age, os.getpid()))
    print(kwargs)
    sleep(0.2)
if __name__=='__main__':
  p = Process(target=run_proc, args=('test',18), kwargs={"m":20})
  p.start()
  sleep(1) # 1秒中之后，立即结束子进程
  p.terminate()
  p.join()

# -*- coding:utf-8 -*-
from multiprocessing import Process
import os
import time
nums = [11, 22]
def work1():
  """子进程要执行的代码"""
  print("in process1 pid=%d ,nums=%s" % (os.getpid(), nums))
  for i in range(3):
    nums.append(i)
    time.sleep(1)
    print("in process1 pid=%d ,nums=%s" % (os.getpid(), nums))
def work2():
  """子进程要执行的代码"""
  print("in process2 pid=%d ,nums=%s" % (os.getpid(), nums))
if __name__ == '__main__':
  p1 = Process(target=work1)
  p1.start()
  p1.join()
  p2 = Process(target=work2)
  p2.start()