from flask import Flask
app=Flask(__name__)

-sharpfrom apscheduler.schedulers.tornado import TornadoScheduler
-sharpscheduler=TornadoScheduler()
-sharpscheduler.start()

@app.route("/")
def index():
    return "Flask"

from tornado.httpserver import HTTPServer
from tornado.ioloop import IOLoop
from tornado.options import options,define
from tornado.wsgi import WSGIContainer

try:
    -sharp-sharp-sharp-sharp
    options.parse_command_line()
    http_server = HTTPServer(WSGIContainer(app))
    http_server.bind(port=8000)
    http_server.start(1)
    IOLoop.instance().start()
except KeyboardInterrupt:
    pass

once you set http_server.start (num_processes) to the number of processes greater than 1 and release TornadoScheduler, you will start to report an error as follows. Please take a look at how to write to use TornadoScheduler in multiple processes

Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/asyncio/selector_events.py", line 262, in _add_reader
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/asyncio/selector_events.py", line 262, in _add_reader
    key = self._selector.get_key(fd)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/selectors.py", line 192, in get_key
    key = self._selector.get_key(fd)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/selectors.py", line 192, in get_key
    raise KeyError("{!r} is not registered".format(fileobj)) from None    
raise KeyError("{!r} is not registered".format(fileobj)) from None
KeyErrorKeyError: : "7 is not registered""7 is not registered"


During handling of the above exception, another exception occurred:


During handling of the above exception, another exception occurred:

Traceback (most recent call last):
Traceback (most recent call last):
  File "/Users/Jeason/Documents/PycharmProjects/monitor/app.py", line 27, in <module>
  File "/Users/Jeason/Documents/PycharmProjects/monitor/app.py", line 27, in <module>
        http_server.start(options.processes)
http_server.start(options.processes)  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/tornado/tcpserver.py", line 222, in start

  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/tornado/tcpserver.py", line 222, in start
    self.add_sockets(sockets)    
self.add_sockets(sockets)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/tornado/tcpserver.py", line 158, in add_sockets
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/tornado/tcpserver.py", line 158, in add_sockets
    sock, self._handle_connection)    
sock, self._handle_connection)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/tornado/netutil.py", line 268, in add_accept_handler
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/tornado/netutil.py", line 268, in add_accept_handler
    io_loop.add_handler(sock, accept_handler, IOLoop.READ)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/tornado/platform/asyncio.py", line 80, in add_handler
    io_loop.add_handler(sock, accept_handler, IOLoop.READ)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/tornado/platform/asyncio.py", line 80, in add_handler
    fd, self._handle_events, fd, IOLoop.READ)
    fd, self._handle_events, fd, IOLoop.READ)  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/asyncio/selector_events.py", line 335, in add_reader

  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/asyncio/selector_events.py", line 335, in add_reader
    return self._add_reader(fd, callback, *args)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/asyncio/selector_events.py", line 265, in _add_reader
    return self._add_reader(fd, callback, *args)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/asyncio/selector_events.py", line 265, in _add_reader
    (handle, None))
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/selectors.py", line 522, in register
    (handle, None))
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/selectors.py", line 522, in register
    self._selector.control([kev], 0, 0)
OSError:     self._selector.control([kev], 0, 0)[Errno 9] Bad file descriptor

OSError: [Errno 9] Bad file descriptor
[W 190128 12:41:12 process:163] child 1 (pid 7060) exited with status 1, restarting
[W 190128 12:41:12 process:163] child 0 (pid 7059) exited with status 1, restarting
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/asyncio/selector_events.py", line 262, in _add_reader
    key = self._selector.get_key(fd)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/selectors.py", line 192, in get_key
    raise KeyError("{!r} is not registered".format(fileobj)) from None
KeyError: "7 is not registered"