UniTaskPause is an object you can await on in your async task until someone calls UnPause()

UniTaskPause.cs

/*
 * Copyright 2024 Marcin Swiderski
 * 
 * The MIT Licence (MIT)
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
 
using System;
using System.Runtime.CompilerServices;

public class UniTaskPause
{
    private Action _paused;

    public bool IsPaused()
    {
        return _paused != null;
    }

    public void UnPause()
    {
        _paused?.Invoke();
        _paused = null;
    }

    public Awaiter GetAwaiter()
    {
        return new Awaiter(this);
    }

    public readonly struct Awaiter : ICriticalNotifyCompletion
    {
        private readonly UniTaskPause _pause;

        public Awaiter(UniTaskPause pause)
        {
            _pause = pause;
        }

        public bool IsCompleted => false;

        public void GetResult() {}

        public void OnCompleted(Action continuation)
        {
            _pause._paused = continuation;
        }

        public void UnsafeOnCompleted(Action continuation)
        {
            _pause._paused = continuation;
        }
    }
}

UniTaskPauseExampleUsage.cs

using System.Threading;
using Cysharp.Threading.Tasks;
using UnityEngine;

public class UniTaskPauseExampleUsage : MonoBehaviour
{
    private UniTaskPause _workPause = new();

    private void Start()
    {
        _ = WorkUpdate(destroyCancellationToken);
    }

    private async UniTaskVoid WorkUpdate(CancellationToken cancel)
    {
        while (true) {
            await UniTask.Yield(cancel);
            
            // Do some work

            bool moreWork = false;
            if (!moreWork) {
                await _workPause;
            }
        }
    }

    private void OnMoreWork()
    {
        _workPause.UnPause();
    }
}

It's not really tied to UniTask in any way, but I made it with the intent of using it with UniTask.