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fastapi怎么样开开启一个一直运行的子任务而不占用阻塞主程序运行

import threading
from fastapi import FastAPI

app = FastAPI()

def background_task():
while True:
# 你的持续运行任务逻辑
print(“Background task is running…”)
# 可以添加一些休眠以避免过度占用CPU
# time.sleep(1)

@app.on_event(“startup”)
async def startup_event():
# 在应用启动时启动后台任务
thread = threading.Thread(target=background_task)
thread.daemon = True # 设置为守护线程，确保在主程序退出时也能终止
thread.start()

@app.get(“/”)
async def read_root():
return {“Hello”: “World”}

import asyncio
from fastapi import FastAPI

app = FastAPI()

async def background_task():
while True:
# 你的异步持续运行任务逻辑
print(“Async background task is running…”)
await asyncio.sleep(1) # 异步休眠，不会阻塞事件循环

@app.on_event(“startup”)
async def startup_event():
# 在应用启动时启动后台任务
app.state.background_task = asyncio.create_task(background_task())

@app.get(“/”)
async def read_root():
return {“Hello”: “World”}

确保在应用关闭时取消所有后台任务

@app.on_event(“shutdown”)
async def shutdown_event():
if hasattr(app.state, “background_task”):
app.state.background_task.cancel()
try:
await app.state.background_task
except asyncio.CancelledError:
pass