SOLVED
XInitThreads() must be called prior to initailizing X , then it works using
XLockDisplay() and XUnlockDisplay()
XLockDisplay(TheDisplay);
NewEvent := Xpending(TheDisplay) > 0 ;
if NewEvent then
begin
XNextEvent(TheDisplay, @myevent);
KeypressedX := myevent._type = keypress ;
end;
XUnLockDisplay(TheDisplay);
--
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