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Question

We are running a long job (function) in 3-4 different threads. All running threads got successfully completed but sometimes the exception Thread was being aborted is being thrown by one of the thread which results all threads to stop. Below is sample code for what we are actually doing in our application.

List<Thread> lstThreads = new List<Thread>();
foreach(int 0; i < 4; i++)
{
  Thread th = new Thread(() => {
    RunLongRunningJob(i);
  });
  lstThreads.Add(th);
}
foreach (Thread th in lstThreads)
  th.Start();

We are calling rest api's, writing in files and update database records in RunLongRunningJob .

PS We are not using LOCKS, is this could be the reason?

Answer 1

In C#, threads can not be stopped at all without side effects. Imagine the thread has disposable items ready and - just stops. As a workaround, when a thread gets aborted (which you an - you should not, but you can call on the Thread object) a ThreadAbortException is generated and executed. This allows exception handling to kick in and close file handles etc.

Ah, finally found it - this is the blog post explaining why YOU should never call Thread.Abort (ie it should not be called by application code):

http://www.interact-sw.co.uk/iangblog/2004/11/12/cancellation

This is about timing and the thread not actually executing finally properly in really bad cases.

Now, SOMETHING must find out what causes the thread to be aborted. This is something to check - exception details would help, including the stack trace and possible inner exception in it.