Question

I have a queue , it receives data overtime.
I used multi thread to dequeue and save to database.
I create an Array of Thread to do this job.

for (int i = 0; i < thr.Length; i++)
{
    thr[i] = new Thread(new ThreadStart(SaveData));
    thr[i].Start();
}

SaveData

Note : eQ and eiQ is 2 global queue. I used while to keep thread alive.

public void SaveData()
{

    var imgDAO = new imageDAO ();
    string exception = "";
    try
    {
        while (eQ.Count > 0 && eiQ.Count > 0)
        {
            var newRecord = eQ.Dequeue();
            var newRecordImage = eiQ.Dequeue();                        

            imageDAO.SaveEvent(newEvent, newEventImage);

            var storepath = Properties.Settings.Default.StorePath;
            save.WriteFile(storepath, newEvent, newEventImage);
        }
    }
    catch (Exception e)
    {                
        Global._logger.Info(e.Message + e.Source);
    }
}

It did create multi thread but when I debug, only 1 thread alive, the rest is dead.
I dont know why ? Any one have idea? Tks

Answer 1

You are using WriteFile in that thread function.

Is this possible, that you trying to write file that may be locked by another thread (same filename or something)?

And one more thing – saving data on disk by multiple threads – i dont like it.

I think you should create some buffer instead of many threads and write it every few records/entries.