/*
 * Copyright (c) 2023 Proton AG
 *
 * This file is part of ProtonVPN.
 *
 * ProtonVPN is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * ProtonVPN is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with ProtonVPN.  If not, see <https://www.gnu.org/licenses/>.
 */

using System.Threading;

namespace ProtonVPN.Common.Legacy.Threading;

public class CancellationHandle
{
    private volatile CancellationTokenSource _tokenSource = new();

    public CancellationToken Token => _tokenSource.Token;

    public void Cancel()
    {
        CancellationTokenSource newSource = new();
        while (true)
        {
            CancellationTokenSource source = _tokenSource;
            CancellationTokenSource prevSource = Interlocked.CompareExchange(ref _tokenSource, newSource, source);
            if (prevSource == source)
            {
                prevSource.Cancel();
                prevSource.Dispose();
                return;
            }
        }
    }
}