Throwing exceptions inside lock() blocks RSS

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  grennis

  Member

  80 Points

  16 Posts

  Throwing exceptions inside lock() blocks

  Dec 20, 2003 03:12 PM|LINK

  At the end of the following code, is object al locked or not?

  ArrayList al = new ArrayList();
  
  
  // other code here...
  
  
  try
  {
      lock(al)
      {
          // Do something...
          throw new Exception("UH OH!");
      }
  }
  catch(Exception ex)
  {
      // Is al still locked???
  }

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  taylorza

  Member

  325 Points

  65 Posts

  Re: Throwing exceptions inside lock() blocks

  Dec 20, 2003 06:30 PM|LINK

  Hi, No, the lock will be released. To understand this you must realise that the lock is just a convenient way of doing the following

  try
  {
    Monitor.Enter( al );
    // Do something...
    throw new ApplicationException( "UH OH!");
  }
  finally
  {
    Monitor.Leave( al );
  }

  So the code above results in

  try
  {
    try
    { 
      Monitor.Enter( al );
      // Do something...
      throw new ApplicationException( "UH OH!");
    }
    finally
    {
      Monitor.Leave( al );
    }
  }
  catch ( Exception ex )
  {
  }
  

  Hope this helps
  Chris Taylor
  
  
  My Blog