Method lock_opt

crates/vm/src/stdlib/_io.rs:2810–2817

(
            &self,
            vm: &VirtualMachine,
        )

    impl TextIOWrapper {
        fn lock_opt(
            &self,
            vm: &VirtualMachine,
        ) -> PyResult<PyThreadMutexGuard<'_, Option<TextIOData>>> {
            self.data
                .lock_wrapped(|do_lock| vm.allow_threads(do_lock))
                .ok_or_else(|| vm.new_runtime_error("reentrant call inside textio"))
        }

        fn lock(&self, vm: &VirtualMachine) -> PyResult<PyMappedThreadMutexGuard<'_, TextIOData>> {
            let lock = self.lock_opt(vm)?;