public async Task <IDisposable> LockAsync(TKey key)
{
SemaphoreHolder holder;
lock (_lock)
{
if (!_semaphores.TryGetValue(key, out holder))
{
holder = new SemaphoreHolder(key);
holder.Released += Holder_Released;
_semaphores[key] = holder;
}
holder.EnqueueAwaiter();
}
await holder.WaitAsync();
return(new LockHolder(holder));
}
public LockHolder(SemaphoreHolder holder)
{
_holder = holder;
}
