ReentrancyGuard.cs

using System;
using System.Threading;
using System.Threading.Tasks;
 
namespace NeuroAccessMaui.UI.MVVM.Reentrancy
{
    public sealed class ReentrancyGuard
    {
        private int gate = 0;
 
        public async Task<bool> RunIfNotBusy(Func<Task> action)
        {
            if (action is null)
                throw new ArgumentNullException(nameof(action));
            if (Interlocked.CompareExchange(ref this.gate, 1, 0) != 0)
            {
                return false; // Already running
            }
            try
            {
                await action().ConfigureAwait(false);
                return true;
            }
            finally
            {
                Interlocked.Exchange(ref this.gate, 0);
            }
        }
 
        public bool IsBusy => this.gate != 0;
    }
}