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Unblock periodically the main process to check for signal #2059

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Unblock periodically the main process to check for signal #2059

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10 changes: 8 additions & 2 deletions uvicorn/supervisors/multiprocess.py
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
import logging
import os
import signal
import sys
import threading
from multiprocessing.context import SpawnProcess
from socket import socket
Expand Down Expand Up @@ -42,7 +43,9 @@ def signal_handler(self, sig: int, frame: Optional[FrameType]) -> None:

def run(self) -> None:
self.startup()
self.should_exit.wait()
while True:
if self.should_exit.wait(self.config.reload_delay):
break
Comment on lines +47 to +48
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This is a setting that should be used only for --reload.

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Oh right, do you think it makes sense to add a config just for this? Or is it better to use a fixed timeout/constant value?

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Isn't there an alternative solution? This problem started happening after a feature we added, didn't it?

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I tried to remove the signal added in #1909 to check but the issue was still there on windows. I'll try to diff from 0.21.1 and isolate the features to find the exact change that caused the issue.

Side note: I also noticed also a flaky startup issue happening on windows while debugging this that I'll dig more on it later.

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Yeah, tests on reload are flaky... I don't know why. You can add the skipif on them as well for the time being. I'll accept a PR for it.

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Just tested with 0.21.1 and the error of ctrl+c is still there.

I'm running it on Windows 10 with powershell 7.3.6 but I also tested with cmd and got the same freeze.
Python version used for the test is 3.11.1 and the packages are those:

➜ pip freeze
annotated-types==0.5.0
anyio==3.7.1
click==8.1.6
colorama==0.4.6
fastapi==0.100.0
h11==0.14.0
idna==3.4
pydantic==2.1.1
pydantic_core==2.4.0
sniffio==1.3.0
starlette==0.27.0
typing_extensions==4.7.1
uvicorn==0.21.1

Also, the app used for the test was the fastapi base example:

from typing import Union

from fastapi import FastAPI

app = FastAPI()


@app.get("/")
def read_root():
    return {"Hello": "World"}


@app.get("/items/{item_id}")
def read_item(item_id: int, q: Union[str, None] = None):
    return {"item_id": item_id, "q": q}

And the command I'm running is:

uvicorn main:app --workers 2

self.shutdown()

def startup(self) -> None:
Expand All @@ -64,7 +67,10 @@ def startup(self) -> None:

def shutdown(self) -> None:
for process in self.processes:
process.terminate()
if sys.platform == "win32":
self.should_exit.set() # pragma: py-not-win32
else:
process.terminate() # pragma: py-win32
process.join()

message = "Stopping parent process [{}]".format(str(self.pid))
Expand Down