需求描述
代码在asyncio
的框架中运行, 但是一旦一个task
出现了长时间的堵塞,我们要跳过这个task
(代码可能是用户输入的,例如用户编写的插件)
代码如下
(其中大部分代码出自官方的 asyncio 以及 signal)
重点的函数在于 asyncio.gather
详情查看上面的链接
import asyncio
import os
import signal
import time
async def factorial(name, number):
f = 1
for i in range(2, number + 1):
print(f"Task {name}: Compute factorial({i})...")
await asyncio.sleep(1)
f *= i
print(f"Task {name}: factorial({number}) = {f}")
async def test():
for i in range(100):
print("sleep--", i)
time.sleep(1)
def handler(signum, frame):
print('Signal handler called with signal', signum)
raise OSError("Couldn't open device!")
signal.signal(signal.SIGTERM, handler)
print(os.getpid())
async def main():
# Schedule three calls *concurrently*:
await asyncio.gather(
test(),
factorial("A", 2),
factorial("B", 3),
factorial("C", 4),
return_exceptions=True
)
asyncio.run(main())
运行结果如下
18733
sleep-- 0
sleep-- 1
sleep-- 2
sleep-- 3
sleep-- 4
sleep-- 5
sleep-- 6
Signal handler called with signal 15
Task A: Compute factorial(2)...
Task B: Compute factorial(2)...
Task C: Compute factorial(2)...
Task A: factorial(2) = 2
Task B: Compute factorial(3)...
Task C: Compute factorial(3)...
Task B: factorial(3) = 6
Task C: Compute factorial(4)...
Task C: factorial(4) = 24
Process finished with exit code 0
这样就可以跳过被长时间堵塞的task,或者长时间执行的task了