exit_in_thread_of_subprocess.py

import multiprocessing
import threading
import time
import os
import psutil
import sys
import errno

def worker():
    print('warker start')
    time.sleep(10)
    print('worker exit')
    os._exit(3)
    #sys.exit(3)
    #return 3


def check_mem():
    time.sleep(5)
    print('check_mem end')
    os._exit(3)


def worker2():
    print('warker start')
    t = threading.Thread(target=check_mem)
    t.daemon = True
    t.start()
    while True:
        time.sleep(10)
    print('worker exit')


def executor():
    proc = multiprocessing.Process(target=worker2)
    proc.daemon = True
    proc.start()

    pid = proc.pid
    print('work pid', pid)

    ps = psutil.Process(pid)


    while not (ps.status()  == psutil.STATUS_ZOMBIE or not ps.is_running()):
        print('working, ', ps.status())
        time.sleep(1)

    proc.join(1)

    print('exit code', proc.exitcode)
    try:
        os.waitpid(pid, os.WNOHANG)
    except OSError as e:
        if e.errno == errno.ECHILD:
            print("errno.ECHILD")
        else:
            logger.exception('process termination fail: ', e.message)

executor()

reserved exit codes：

are-there-any-standard-exit-status-codes-in-linux

https://shapeshed.com/unix-exit-codes/