[Mono-dev] Threads and X-Windows?

Rob Wilkens robwilkens at gmail.com
Wed May 30 20:12:02 UTC 2012

Thanks!  I thought there was supposed to be only one UI thread.

That is useful information (your sample code).  I may use it as i 
troubleshoot further.

I don't want to change the code i have, though, because again this  code 
in the report i have somehow manages to work in Windows.  But i may be 
able to use the information in your code sample to help make it 'work 
like it works in windows/.net' at least as far as this issue I'm looking 

I'll do my best not to break anything in the process..


On 05/30/2012 04:02 PM, Patrick Cullen wrote:
> In .NET  there is only one thread that does UI work, this is how you
> access it irrespective of what thread makes the call. I use this for
> event patterns often. The key is "SendOrPostCallback" which determines
> if you are running on the UI thread.
> I use this code often and it works under Mono. I think the behavior is
> very different but the end result is what I am looking for.
> Patrick
> protected SynchronizationContext _uiContext;
> _uiContext = WindowsFormsSynchronizationContext.Current;
> _uiContext.Send(new SendOrPostCallback(
> 	  delegate(object state)
> 	  {
> 		// * Interact with controls here
> 	  }
>     ), null);
> On Wed, May 30, 2012 at 2:56 PM, Rob Wilkens<robwilkens at gmail.com>  wrote:
>> I'm troubleshooting a problem in System.Windows.Forms (or an application
>> which uses it):
>> Does anyone know of problems where messages processed from thread a can't
>> reach a window created in thread b?  That is, if thread a is processing
>> messages, those messages don't reach the windows created in thread b?  By
>> messages, i mean things like WM_CLOSE and WM_PAINT (or invalidate? or
>> whatever the equivalents are)...  (Messages that are processed, in theory,
>> by Application.Run() in thread a)...
>> I'm trying to figure out if this is an X11 issue or a mono issue..  I'm
>> thinking depending on how the day goes i may break from troubleshooting this
>> soon.
>> Before you say this is a bad idea (multiple threads creating windows) keep
>> in mind this was code in a problem report and In windows .net messages
>> processed in thread a reach windows created in thread b without issue.  At
>> least as far as i can tell.
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