Function test_WaitForSingleObject

src/trio/_tests/test_wait_for_object.py:136–167

()

async def test_WaitForSingleObject() -> None:
    # This does a series of test for setting/closing the handle before
    # initiating the wait.

    # Test already set
    handle = kernel32.CreateEventA(ffi.NULL, True, False, ffi.NULL)
    kernel32.SetEvent(handle)
    await WaitForSingleObject(handle)  # should return at once
    kernel32.CloseHandle(handle)
    print("test_WaitForSingleObject already set OK")

    # Test already set, as int
    handle = kernel32.CreateEventA(ffi.NULL, True, False, ffi.NULL)
    handle_int = int(ffi.cast("intptr_t", handle))
    kernel32.SetEvent(handle)
    await WaitForSingleObject(handle_int)  # should return at once
    kernel32.CloseHandle(handle)
    print("test_WaitForSingleObject already set OK")

    # Test already closed
    handle = kernel32.CreateEventA(ffi.NULL, True, False, ffi.NULL)
    kernel32.CloseHandle(handle)
    with pytest.raises(OSError, match=r"^\[WinError 6\] The handle is invalid$"):
        await WaitForSingleObject(handle)  # should return at once
    print("test_WaitForSingleObject already closed OK")

    # Not a handle
    with pytest.raises(TypeError):
        await WaitForSingleObject("not a handle")  # type: ignore[arg-type] # Wrong type
    # with pytest.raises(OSError):
    #     await WaitForSingleObject(99)  # If you're unlucky, it actually IS a handle :(
    print("test_WaitForSingleObject not a handle OK")


@slow