What is the correct usage for sqlite on locking or async

Question

We are using Xamarin to write C# code with SQLite for android and ios. However about how to use sqlite, I seem to have a conceptual misunderstanding:

What are the best p

Answer 1

The fact that your Database doesn't accept multiple accesses (insertions, updates, etc..) doesn't mean that the single thread doing work against it has to do so using a blocking api.

If you don't have to do cross-process locking, you can use SemaphoreSlim.WaitAsync instead of your Mutex inside your async method to await the lock asynchrnously:

private readonly SemaphoreSlim semaphoreSlim = new SemaphoreSlim(initialCount: 1);

public async Task InsertAsync(T item)
{
   await semaphoreSlim.WaitAsync();
   try
   {
      await asyncConnection.InsertAsync(item);
   }
   finally
   { 
      semaphoreSlim.Release();
   }
}

public async Task InsertOrUpdateAsync(T item)
{
   await semaphoreSlim.WaitAsync();
   try
   {      
      int count = await asyncConnection.UpdateAsync(item);
      if (0 == count) 
      {
         await asyncConnection.InsertAsync(item);
      }
   }
   finally
   {
      semaphoreSlim.Release();
   }
}