Method cancel

crates/stdlib/src/_asyncio.rs:462–476

(zelf: PyRef<Self>, args: CancelArgs, vm: &VirtualMachine)

        #[pymethod]
        fn cancel(zelf: PyRef<Self>, args: CancelArgs, vm: &VirtualMachine) -> PyResult<bool> {
            if zelf.fut_loop.read().is_none() {
                return Err(vm.new_runtime_error("Future object is not initialized."));
            }
            if zelf.fut_state.load() != FutureState::Pending {
                // Clear log_tb even when cancel fails
                zelf.fut_log_tb.store(false, Ordering::Relaxed);
                return Ok(false);
            }

            *zelf.fut_cancel_msg.write() = args.msg.flatten();
            zelf.fut_state.store(FutureState::Cancelled);
            Self::schedule_callbacks(&zelf, vm)?;
            Ok(true)
        }

        #[pymethod]
        fn cancelled(&self) -> bool {