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BufferBlock deadlock with OutputAvailableAsync after TryReceiveAll

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闹比i
闹比i 2021-01-31 18:29

While working on an answer to this question, I wrote this snippet:

var buffer = new BufferBlock();
var producer = Task.Run(async () =>
{
    whi         


        
      
      
      

        

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                 無奈伤痛 
              
              
    
                
                   無奈伤痛
                                             
                
                
                (楼主)
            
              
                  
    
                2021-01-31 19:31
              
    

            
    
            
    
              
              

    This is a bug in SourceCore being used internally by BufferBlock. Its TryReceiveAll method doesn't turn on the _enableOffering boolean data member while TryReceive does. That results in the task returned from OutputAvailableAsync never completing.
    


    Here's a minimal reproduce:
    


    var buffer = new BufferBlock();
buffer.Post(null);

IList items;
buffer.TryReceiveAll(out items);

var outputAvailableAsync = buffer.OutputAvailableAsync();
buffer.Post(null);

await outputAvailableAsync; // Never completes



    I've just fixed it in the .Net core repository with this pull request. Hopefully the fix finds itself in the nuget package soon.
    
    
    
             
    
                                                        
    
            
            
    
              
                
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