Function test_Event

src/trio/_tests/test_sync.py:17–50

()

async def test_Event() -> None:
    e = Event()
    assert not e.is_set()
    assert e.statistics().tasks_waiting == 0

    with pytest.warns(
        DeprecationWarning,
        match=r"trio\.Event\.__bool__ is deprecated since Trio 0\.31\.0; use trio\.Event\.is_set instead \(https://github.com/python-trio/trio/issues/3238\)",
    ):
        e.__bool__()

    e.set()
    assert e.is_set()
    with assert_checkpoints():
        await e.wait()

    e = Event()

    record = []

    async def child() -> None:
        record.append("sleeping")
        await e.wait()
        record.append("woken")

    async with _core.open_nursery() as nursery:
        nursery.start_soon(child)
        nursery.start_soon(child)
        await wait_all_tasks_blocked()
        assert record == ["sleeping", "sleeping"]
        assert e.statistics().tasks_waiting == 2
        e.set()
        await wait_all_tasks_blocked()
        assert record == ["sleeping", "sleeping", "woken", "woken"]


async def test_CapacityLimiter() -> None: