wabbajack/Wabbajack.Common/AsyncLock.cs

using System;
using System.Reactive.Disposables;
using System.Threading;
using System.Threading.Tasks;

namespace Wabbajack.Common;

public class AsyncLock
{
    private readonly SemaphoreSlim _lock = new(1, 1);

    public async Task<IDisposable> WaitAsync()
    {
        await _lock.WaitAsync();
        return Disposable.Create(() => _lock.Release());
    }
}