LanguageFeatures/FinalizationRegistry/ffi/Finalizer/attach_A06_t01.dart

// Copyright (c) 2022, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

/// @assertion The finalizer can be attached multiple times to the same object
/// with different, or the same, finalization token.
///
/// @description Checks that finalizer can be attached to the same object with
/// the same finalization token several times.
/// @author iarkh@unipro.ru

import '../../gc_utils_lib.dart';
import '../../../../Utils/expect.dart';

class Nonce {
  final int value;
  Nonce(this.value);
}

final finalizerTokens = <String>{};

final Finalizer finalizer = Finalizer((token) {
  finalizerTokens.add(token);
});

@pragma('vm:never-inline')
void attachToFinalizer(Nonce token1, Nonce token2, Nonce token3) {
  Object value = Object();
  finalizer.attach(value, "Finalization token", detach: token1);
  finalizer.attach(value, "Finalization token", detach: token2);
  finalizer.attach(value, "Finalization token", detach: token3);
}

main() async {
  attachToFinalizer(Nonce(1), Nonce(2), Nonce(3));

  await triggerGcWithDelay();
  Expect.setEquals({"Finalization token"}, finalizerTokens);
}