如何一次只运行一次协程，不管它被调用了多少次？

import asyncio

class SingletonCoroutine:
    def __init__(self):
        self._ran = False

    async def run(self):
        if not self._ran:
            print("Running the coroutine for the first time")
            await asyncio.sleep(1)  # 模拟协程工作
            self._ran = True
        else:
            print("Coroutine has already run")

async def main():
    coroutine = SingletonCoroutine()
    await coroutine.run()
    await coroutine.run()  # 第二次调用不会再次运行

asyncio.run(main())

import asyncio

class SingletonCoroutine:
    def __init__(self):
        self._event = asyncio.Event()

    async def run(self):
        if not self._event.is_set():
            print("Running the coroutine for the first time")
            await asyncio.sleep(1)  # 模拟协程工作
            self._event.set()
        else:
            print("Coroutine has already run")

async def main():
    coroutine = SingletonCoroutine()
    await coroutine.run()
    await coroutine.run()  # 第二次调用不会再次运行

asyncio.run(main())

import asyncio

class SingletonCoroutine:
    def __init__(self):
        self._lock = asyncio.Lock()

    async def run(self):
        async with self._lock:
            print("Running the coroutine for the first time")
            await asyncio.sleep(1)  # 模拟协程工作

async def main():
    coroutine = SingletonCoroutine()
    await coroutine.run()
    await coroutine.run()  # 第二次调用不会再次运行

asyncio.run(main())