Posting events to application event queue. Can you?

[Jeff <wd4nmq@xxxxxxxxxxx>]

Can you post events to an X apps event queue like you can use 
PostMessage() to post messages to a Windows app?

What I mean is I have an X app that starts a worker thread. The main 
thread handles the gui and sends /gets commands/responses from the 
worker thread. The worker thread, wel performs work. In Windows I would 
use the PostThreadMessage() and PostMessage() to do this. How could this 
be done in X.

From the gui to the worker thread is no problem. Set up a mutex 
protected queue between the two and the thread does a conditional wait 
until teh gui posts something.

But, can the thread put a special event on the gui's event handler and 
teh gui have a callback for that event?

I guess you could have  a queue from worker thread to gui and the gui 
check it in the event loop handler. Instead of using XtAppMainLoop() you 
would do this:

for(;;){
   if(CheckThreadQueue())  
      ProcessQueueData();
   if(XtPeekEvent){
      XtAppNextEvent();
      XtDispatchevent();
   }  
}
  
PS: I am no X expert by a long shot. I have use mostly Tcl/Tk and xforms 
and very little low level, Xt, programming.

Jeff
wd4nmq@xxxxxxxxxxx

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