How can I limit one instance of async in a colliderhit event?

Questions & Answers
1

I am trying to limit only one instance of async function running in a colliderhit event. I learned that I can use an async lock. I adopted the code as below but the async function still run multiple times.

private static SemaphoreSlim _sl = new SemaphoreSlim(1, 1);
async Task Break2(GameObject obj2break){
            await _sl.WaitAsync();
            
            try { 
            await Task.Delay(1000);
            audioSource.Play();
            obj2break.SetActive(false);

            Instantiate(brokenObject, obj2break.transform.position, obj2break.transform.rotation);
            Vector3 explosionPos = obj2break.transform.position;
            
            Collider[] colliders = Physics.OverlapSphere(explosionPos, radius);

            foreach (Collider hit in colliders)
            {
                if (hit.GetComponent<Rigidbody>())
                {
                    hit.GetComponent<Rigidbody>().AddExplosionForce(power, explosionPos, radius, upwards);
                }
            }
        }   finally
        {
         // Release the thread
         _sl.Release();
        }
}

Thanks in advance for any help!

2

You could simply use a boolean to return out the async function if one instance is already running. For example:

volatile bool IsRunning = false;

void OnColliderHit()
{
     _ = Break2(...);
}

async Task Break2(GameObject obj2break)
{
     if (IsRunning)
         return;

     IsRunning = true;

     // rest of code...

     IsRunning = false;
}

@wujinjindx