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Canceling Threads


By : user3851795
Date : October 15 2020, 11:12 PM
hope this fix your issue If you are using a BackgroundWorker then you already have all of the infrastructure you need to cancel the operation. Simply set WorkerSupportsCancellation to true on the BackgroundWorker, and invoke the worker's CancelAsync method when you want to cancel.
Obviously you have to write the worker code to honour the cancellation. You do this by checking the CancellationPending property of the BackgroundWorker.
code :


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Canceling Worker threads in winforms


By : Dams
Date : March 29 2020, 07:55 AM
wish of those help I've got two list boxes, one a master, the other a child. When the index changes on the master, the child listbox gets filled appropriately with records relating to the master. My problem is coming up when one master takes a long time to get all the records and before it has completed getting the records, a user clicks a different master that takes less time to fill. What happens is that eventually, the master that was taking longer fills in the child list box even though the user isn't on that master anymore. , Your method, bg_LoadAllWork, should be defined as:
code :
void bg_LoadAllWork(object sender, DoWorkEventArgs e)
{
    // Do your work here...
} 

VS2010 Threads window shows 25 threads and Process.Threads.Count.50 Why?


By : user2073212
Date : March 29 2020, 07:55 AM
hop of those help? Anytime you create a thread in user code, the system creates a matching kernel thread. My guess (though it's certainly only a guess) is that one of the tools is showing the count only of user threads, while the other shows the count for both user and kernel threads.

Since all user threads are mapped to kernel threads , then user threads are running in kernal mode?


By : perestije
Date : March 29 2020, 07:55 AM
may help you . Sometimes, when you perform a system call. But that's not what the term really means.
"Kernel threads" refers to the fact that the kernel itself recognizes each thread as being separate. This means that they each have a corresponding data structure in the kernel, and the kernel can treat them individually, such as by scheduling them separately. The mode the thread is running in has nothing to do with it since it is just the concept of the thread in the kernel.

Canceling a Lwt. thread


By : akshay jose
Date : March 29 2020, 07:55 AM
I wish this help you I was putting the try/with at the wrong level.
This code shows the right place to put the try/with for the Lwt.Canceled exception
code :
#require "lwt.unix, lwt.ppx"
open Lwt.Infix

let program =
  let counter = ref 1 in
  let can_cancel = fst (Lwt.task ()) in

  Lwt.async begin fun () ->
    let rec forever () =
        Lwt_io.printl "Hello World" >>= fun () ->
        if !counter = 3 then Lwt.cancel can_cancel
        else counter := !counter + 1;
        Lwt_unix.sleep 0.5 >>= forever
    in
    forever ()
  end;
  can_cancel

let () =
  try
    Lwt_main.run program
  with
    Lwt.Canceled -> Lwt_io.printl "ended" |> Lwt.ignore_result

Threads, why 1000 threads and 2000 threads does not make much noticeable difference


By : unfair717
Date : March 29 2020, 07:55 AM
I hope this helps . As already mentioned in the comments, there is no need to have significantly more threads than CPU-cores. You will actually get less performance if you have more threads than CPU-cores due to the fact that the kernel will waste CPU-cycles switching threads. The more threads you have, the more time will be wasted switching between them, in general at least, it has to do with the nature of the application as well.
Also, when you have many threads to switch between, you are more likely to cache-trashing. To clarify:
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