gevent.subprocess vs os.waitpid

gistfile1.py

from gevent import monkey
monkey.patch_subprocess()

import os
import signal
import subprocess

import gevent


def task():
    while True:
        # print('task')
        subprocess.call(['echo', 'task'])
        gevent.sleep(1)


if __name__ == '__main__':
    pid = gevent.fork()

    if pid == 0:
        running = True

        def _stop():
            global running
            running = False

        gevent.signal(signal.SIGTERM, _stop)
        gevent.signal(signal.SIGINT, _stop)

        while running:
            print('process')
            gevent.sleep(1)

        os._exit(0)

    greenlet = gevent.spawn(task)

    def _stop():
        os.kill(pid, signal.SIGTERM)
        greenlet.kill()

    gevent.signal(signal.SIGTERM, _stop)
    gevent.signal(signal.SIGINT, _stop)

    while True:
        print('waiting for process')
        pid, status = os.waitpid(-1, os.WNOHANG)
        if pid:
            print('process {} exited with status {}'.format(pid, status))
            break
        gevent.sleep(0.1)

    greenlet.join()