06-27-2007
Quote:
Originally Posted by
anjul_thegreat
.... in the second parent job invoked if the actual parent is killed.
The only reparenting that occurs is from a dead parent to pid 1. There is no "second parent".
You will need another process that sits between the original parent and child and waits for the original child to finish and perform some IPC to inform who ever is interested that the child has died and what it's exit status is.
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LEARN ABOUT HPUX
xtunmanageb
XtUnmanageChildren() XtUnmanageChildren()
Name
XtUnmanageChildren - remove a list of children from a parent widget's managed list.
Synopsis
void XtUnmanageChildren(children, num_children)
WidgetList children;
Cardinal num_children;
Inputs
children Specifies an array of child widgets. Each child must be of class RectObj or any subclass thereof.
num_children
Specifies the number of elements in children.
Description
XtUnmanageChildren() unmaps the specified widgets and removes them from their parent's geometry management. The widgets will disappear
from the screen, and (depending on its parent) may no longer have screen space allocated for them.
Each of the widgets in the children array must have the same parent.
See the "Algorithm" section below for full details of the widget unmanagement procedure.
Usage
Unmanaging widgets is the usual method for temporarily making them invisible. They can be re-managed with XtManageChildren().
You can unmap a widget, but leave it under geometry management by calling XtUnmapWidget(). You can destroy a widget's window without
destroying the widget by calling XtUnrealizeWidget(). You can destroy a widget completely with XtDestroyWidget().
If you are only going to unmanage a single widget, it is more convenient to call XtUnmanageChild(). It is often more convenient to call
XtUnmanageChild() several times than it is to declare and initialize an array of widgets to pass to XtUnmanageChildren(). Calling XtUnman-
ageChildren() is more efficient, however, because it only calls the parent's change_managed() method once.
Algorithm
XtUnmanageChildren() performs the following:
o Issues an error if the children do not all have the same parent or if the parent is not a subclass of compositeWidgetClass.
o Returns immediately if the common parent is being destroyed; otherwise, for each unique child on the list, XtUnmanageChildren() performs
the following:
- Ignores the child if it already is unmanaged or is being destroyed.
- Otherwise, if the child is realized, it makes it nonvisible by unmapping it.
o Calls the change_managed() method of the widgets' parent if the parent is realized.
Structures
The WidgetList type is simply an array of widgets:
typedef Widget *WidgetList;
See Also
XtDestroyWidget(1), XtIsManaged(1), XtManageChild(1), XtManageChildren(1), XtUnmanageChild(1).
Xt - Geometry Management XtUnmanageChildren()