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venv/lib/python3.12/site-packages/aiohttp/locks.py

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+import asyncio
+import collections
+from typing import Any, Deque, Optional
+
+
+class EventResultOrError:
+    """Event asyncio lock helper class.
+
+    Wraps the Event asyncio lock allowing either to awake the
+    locked Tasks without any error or raising an exception.
+
+    thanks to @vorpalsmith for the simple design.
+    """
+
+    def __init__(self, loop: asyncio.AbstractEventLoop) -> None:
+        self._loop = loop
+        self._exc: Optional[BaseException] = None
+        self._event = asyncio.Event()
+        self._waiters: Deque[asyncio.Future[Any]] = collections.deque()
+
+    def set(self, exc: Optional[BaseException] = None) -> None:
+        self._exc = exc
+        self._event.set()
+
+    async def wait(self) -> Any:
+        waiter = self._loop.create_task(self._event.wait())
+        self._waiters.append(waiter)
+        try:
+            val = await waiter
+        finally:
+            self._waiters.remove(waiter)
+
+        if self._exc is not None:
+            raise self._exc
+
+        return val
+
+    def cancel(self) -> None:
+        """Cancel all waiters"""
+        for waiter in self._waiters:
+            waiter.cancel()