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500pts: Not all events are arriving in my thread, please help

Posted on 2006-10-31
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Last Modified: 2010-04-16
Hi there,

I wonder if anyone can help..

I have a thread which i start like this..

      _workerThread = new Thread(new ThreadStart(threadMarket.ProcessMarket));
                        _workerThread.Name = market;
                        _threads.Add( market, _workerThread );
                        _workerThread.IsBackground = true;
                        _workerThread.Start();

But once in my thread i subscribe to some events on an object, generally what happens is the event arrives with some arguments saying "LOADING" and then later "LOADED" but i am finding that the event "LOADED" never arrives unless i do a Thread.Sleep (500) and even then not all the events are arriving... This doesn't happen if i subscribe to the events in the gui....

I can't do a InvokeRequired because ThreadMarket is a class...

I am really stuck ... does _workerThread not have enough threads or something....

I look forward to any inspiration or help

Thanks in advance

Ian
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Question by:ianinspain
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LVL 48

Expert Comment

by:AlexFM
ID: 17840598
Please show your code.
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Author Comment

by:ianinspain
ID: 17840656
Hi alexfm,

Thanks... Ok yes of course... its quite simple.. the thing to remember is that it does work as far as the events do arrive with statusCode LOADING but never loaded unless i put the thread.sleep .... i think its something to do with threads... but a little unsure.

This is from the main GUI form ... i start the thread passing in

// This is just a class which i use to pass in a variable to a thread..
ThreadMarket threadMarket = new ThreadMarket(market);

_workerThread = new Thread(new ThreadStart(threadMarket.ProcessMarket));
                        _workerThread.Name = market;
                        _threads.Add( market, _workerThread );
                        _workerThread.IsBackground = true;
                        _workerThread.Start();

Then in the thread itself U(the class)... i have the following ....... _stcs is a hashtable which holds a number of stock items.

            private void SubscribeToMarkets(string market)
            {
                  // Iterate through all of the stocks
                  for (int j = 0; j < _stcs.Count; j++)
                  {
                        if ( (_stcs[j] as Stock).Market == market) // Do we have an stock in the current market?
                        {
                              // Yes - then lets process it
                              string stockInstance = (_stcs[j] as Stock).STC;
                              string marketInstance = (_stcs[j] as Stock).Market;
                              User localmyUser = MonitorForm.MainForm.GetUser;
                              
                              Console.WriteLine("sub to : " + marketInstance + "/" + stockInstance );
                              
                        
                              CliCommon.Stock stock= new Stock (localmyUser,stockInstance , marketInstance );
                              _myStocks.Add(stockInstance ,stock);
                              stock.view.xml = MonitorForm.MainForm.GetXml;
                              stock.view.np = 1;


                              // Subscribe to the event for receiving
                              stock.statusChanged +=new StatusChanged(stock_statusChanged);
                              Thread.Sleep(5000);
                              stock.load();
                        }
                  }
            }


and the event


            private void stock_statusChanged(object sender)
            {
                  //System.Windows.Forms.Application.DoEvents();
                  Stock stock= sender as Stock;
                  if(stock.status == Stock.statusCode.LOADED)
                  {
                        stock.statusChanged -=new StatusChanged(stock_statusChanged);
                        

                              ///////////// NEVER ARRIVES HERE UNLESS I PUT A THREAD.SLEEP but even then some things are missing..

                  }
                  else
                  {
                        //Thread.Sleep(5000);
                  }
            }
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LVL 48

Expert Comment

by:AlexFM
ID: 17840703
stock.statusChanged -=new StatusChanged(stock_statusChanged);

This line unsubscribes from statusChanged event. After this line stock_statusChanged function is not called. Is this your intention?
0
 

Author Comment

by:ianinspain
ID: 17840721
Yes ... because ... once its status is loaded.. i unsubscribe so that i don't receive more evetns for that stock..

It is in the IF statement when its loaded but without the Thread.sleep ... it never arrives...

Ian
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LVL 48

Expert Comment

by:AlexFM
ID: 17840857
What happens in the Stock class? Does it raise this event, what is thread context where this event is raised? Event is always raised in the context of thread where raising code is executed.

What is the purpose of this line:
Thread.Sleep(5000);        // SubscribeToMarkets

0
 

Author Comment

by:ianinspain
ID: 17840923
Hi AlexFM... The stock component belongs to somebody else... i am only using it... but I have just been in contact with him... and he has informed me that we might be running out of threads in thread pool....

Be in contact shortly

Ian
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LVL 48

Accepted Solution

by:
AlexFM earned 500 total points
ID: 17840989
BTW, does your class exist when event is raised? Maybe it is already released at this time. Adding Sleep can explain this - class remains alive for some time and its event handler is working.
Other version: adding Sleep to event handler actually keeps caller's raising event call. This can change Stock class behavior if Stock is some complicated class which has different threads, synchronization etc. Sleep changes timing of this class, this can be question to class developer.
0
 

Author Comment

by:ianinspain
ID: 17864876
Thanks AlexFM,

its sorted now.... it appears that the class (not mine) was using too many threads... it is now resolved...

thanks

ian
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