Re: Do-Nothing WinForm App Using 4 Threads?

Hi,

The .NET threads are not phisically related to the one from win. For example
there is nothing like ThreadPool in native win.

At least one of those thread that you are seeing must be running the GC.

Take a look at this link ; it refers to the CF but I bet something similar
should apply to the full framework

Threads
There are up to four threads created by a .NET Compact Framework
application:

a.. A main application thread.

b.. A thread used to control various period timers and time-outs that can
be scheduled by the system or applications.

c.. A thread used to track changes to the active TCP/IP interfaces
(simulating the media sense behavior that is present on Windows XP but not
Windows CE).

d.. A thread that is used to run object finalizers. It is created when the
first finalizable object is garbage collected.

For more information about threading support, see Threading in the .NET
Compact Framework.



"gsimmons" <simmons.garry@xxxxxxxxx> wrote in message
news:1168870674.106157.29190@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
| I've been researching multi-threaded WinForms apps and thread
| synchronization stuff for a couple days since I'm working on
| refactoring a multi-threaded GUI app at work and want to be sure it's
| rock solid/thread-safe. I've seen all the posts about using BeginInvoke
| to have worker threads interact with the UI. My question is this:
|
| I created a plain old Windows Form application (VS.NET 2005) with a
| blank form, built it (release build), ran it from Windows Explorer and
| Task Manager claims the application is using four threads. What are
| they? Obviously one is the main app/UI. What are the others?
|
| I then added a Windows Timer control to the form and updated a label
| every second. Still four threads. I expected a timer to be on its own
| thread even though it posts "tick" events to the UI message
| loop/thread.
|
| I removed the Windows Timer and replaced it with a System Timer which
| runs "tick" events on a different thread, yet the thread count still
| stays at four. Huh?
|
| Is there a built-in thread pool with a few workers hanging around to do
| timers and stuff? What exactly is going on here?
| Are those extra threads part of the CLR doing its magic to run the EXE?
| Other?
|
| My next question will be how many threads remoting (inter-process on
| the same PC) adds to the mix. The UI app I'm refactoring makes use of
| several remote objects (running methods and receiving events with
| data). I'm guessing there is a thread for each proxy/socket to handle
| marshalling stuff. And the event handling from remote objects
| supposedly grabs a thread from the thread pool. Inquiring minds what to
| really KNOW what's going on under the hood.
|
| Pointers to good articles and/or books welcome. Spend the last weekend
| Googling and reading...
|
| Thanks!
|


.

Relevant Pages

  • Re: More accurate Timerevent
    ... You **cannot** generate accurately timed events on a Windows platform. ... As others said: you need hardware. ... app, services and drivers at the time of the desired count for your app. ... IRQ of a timer from the PC or an add on board. ...
    (alt.comp.lang.borland-delphi)
  • Re: RB 5.5.5, Windows: quit method strange
    ... there is a timer that's running. ... What's interesting is that when I've seen this happen, ... to have quit--no windows or any other visual indication that the app ... Art, photography, shareware, polyamory, literature, kink: ...
    (comp.lang.basic.realbasic)
  • Re: How to determine Fax Job Status
    ... > results or apparent stability in our app. ... The next thing I'll implement is the EventQueue, so my app will get ... notified of status changes instead of using a timer to repeatly query if ... Did you know that the Fax COM was really nice extended for Windows ...
    (microsoft.public.win2000.fax)
  • Re: Do-Nothing WinForm App Using 4 Threads?
    ... refactoring a multi-threaded GUI app at work and want to be sure it's ... I created a plain old Windows Form application with a ... I then added a Windows Timer control to the form and updated a label ... Non "Windows Forms Timers" are handled by the Threadpool, more exactly their handlers run on an IO completion thread pulled from the pool. ...
    (microsoft.public.dotnet.languages.csharp)
  • Re: Dual-core systems - AMD - Windows Vista
    ... recall that NTP on Windows uses some interpolation technique to overcome ... timer granularity, and that the interpolation used a CPU counter. ... Windows Vista. ... Windows Vista differ from Windows XP so as to affect NTP, ...
    (comp.protocols.time.ntp)