Thread and message pump

[Oriane]

Hi,

If I run a classical Windows Form .Net application, with several UI
controls/windows, I guess that (unless I explicitely create new threads)
every UI objects will have the same message pump (since they all have been
created by the same thread). Correct ?

My point is that when we speak about the "UI thread", I don't know if we
speak about the thread which owns the message pump or about the thread which
updates the UI. I want to be sure that this thread does both.

Best regards

 

[miher]

Hi,

As i know control members can be accessed only from the thread that created
it(otherwise You have to Invoke), so at the end the "thread which updates
the UI" is the same as the thread which owns the control.

Hope You find this useful.
-Zsolt

 

[Linda Liu[MSFT]]

Hi Oriane,

Yes, every UI object will have the same message pump.

Message pump is also called message queue. The system automatically creates
a message queue for each thread in an application.

If the thread creates one or more windows, a message loop must be provided;
this message loop retrieves messages from the thread's message queue and
dispatches them to the appropriate window procedures.

In WinForm applications, we call Application.Run method to run a standard
application message loop on the current thread.

when we speak about the "UI thread", I don't know if we speak about the

thread which owns the message pump or about the thread which
updates the UI.

The "UI thread" refers to the thread that creates forms and controls on the
forms and that updates the UI.

Hope I make things clear.
If you have any question, please feel free to let me know.

Sincerely,
Linda Liu
Microsoft Online Community Support

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