XEventNext blocking ...

[Groovounet]

According my code and the fellowing link
http://tronche.com/gui/x/xlib/event-handling/manipulating-event-queue/XNextEvent.html

XEventNext is a blocking function and this is bad for a real time programme... :p

My question is : How to get event without blocking the rendering loop under X Window with OpenGL ?

Thqnks you !

[ZbuffeR]

Use one of the XCheck*Event, those are non-blocking.
http://tronche.com/gui/x/xlib/event-handling/manipulating-event-queue/XCheckWindowEvent.html

[Groovounet]

Thanks, I will try that :)

[Plüss Roland]

while(XPending(p_Display)){
XNextEvent(p_Display, &event);
...
}is most probably what you are after.

Concur with the above solutions, however be aware you still get _soft_ realtime. _hard_ realtime and unix, specifically X are mutually exclusive.