When using multiple event loops, asyncio will raise an error.

[clanet]

When running the following program, you will get a 'RuntimeError: Cannot run the event loop while another loop is running' error. If the patch is not applied, the program will run normally.

import asyncio
import threading
import time
import gevent
import gevent.monkey
gevent.monkey.patch_all()
import asyncio_gevent

asyncio.set_event_loop_policy(asyncio_gevent.EventLoopPolicy())

def _start_event_loop(loop) -> None:
asyncio.set_event_loop(loop)
loop.run_forever()
loop.close()

def _get_threaded_loop():
new_loop = asyncio.new_event_loop()
thread_loop = threading.Thread(target=_start_event_loop, args=(new_loop,), daemon=True)
thread_loop.start()
return new_loop

async def test_async():
while True:
await asyncio.sleep(3)
print("test", time.time())

async def test_async2():
while True:
await asyncio.sleep(3)
print("test2", time.time())

if name == "main":
_loop = _get_threaded_loop()
asyncio.run_coroutine_threadsafe(test_async(), _loop)
asyncio.run(test_async2())