Experimental Physics and
Industrial Control System

Bonnie Madre <[email protected]> · Fri, 17 Apr 1998 8:04:38 EDT

Thomas Birke wrote:

[...snip some problem history...]
> 
>  Bonnie> Attempt to unmanage a child when parent is not Composite
> 
> Thanks to Noboru Yamamoto, he might have found the bug!
> 
> Although we (Noboru and I) both cannot reproduce this behaviour (on HP-UX
> 10.20), it seems reasonable:
> 
> Noboru compared the implementations of the close-button in medm-2.3.3 and
> medm/DESY-2.4.9.
> 
> medm-2.3.3, medmRelatedDisplay.c, line 884 ff.:
> 
>     case RD_CLOSE_BTN:
> 	if (XtClass(w) == xmPushButtonWidgetClass) {
> 	    XtPopdown(relatedDisplayS);
> 	    XtUnmanageChild(relatedDisplayS);
> 	}
> 	break;
> 
> medm/DESY-2.4.9, medmRelatedDisplay.c, line 1354 ff.:
> 
>     case RD_CLOSE_BTN:
>       if (XtClass(w) == xmPushButtonWidgetClass) {
> 	XtPopdown(relatedDisplayS);
>       }
>       break;
> 
> The corresponding part of code in both cases is (lines 1052 resp. 1556 ff):
> 
>   XtManageChild(rdForm);
>   XtPopup(relatedDisplayS,XtGrabNone);
> 
> It seems that both close-implementations are not correct, because
> medm-2.3.3 tries to unmamage a child, that has never been managed and
> medm/DESY-2.4.9 never unmanages the managed child.
> 
> My suggestion (esp. for all Linux, Digital Unix and NT users) would be to
> replace this part of code with:
> 
> medmRelatedDisplay.c, line 884 resp. 1354 ff.:
> 
>     case RD_CLOSE_BTN:
>       if (XtClass(w) == xmPushButtonWidgetClass) {
> 	XtPopdown(relatedDisplayS);
>         XtUnmanageChild(rdForm);
>       }
>       break;
> 
> To see wether it solves the problem.
> 

Yes, this solves the problem - that message no longer appears!
Thank you!

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Bonnie Madre 
Accelerator Development
Integration and Assessment Group

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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System