mrc@Tomobiki-Cho.CAC.Washington.EDU (Mark Crispin) (06/14/90)
Does your application crash in terminate:, leaving behind a nasty core
file? Are you frustrated when you gdb it, only to find that all
that's on the stack is that terminate: called objc_msgSend()?
It turns out that it's a bug that's purportedly fixed in 2.0. What
happens is that terminate: goes around freeing everything, and finally
comes to freeing the pasteboard. The pasteboard wants to talk to its
owner, and if the owner has already been freed then it crashes with a
segmentation fault in objc_msgSend().
The way around this problem is to make sure that the pasteboard's
owner is a factory object. For example, here's a sample terminate:
method for your Application object which gets a confirmation and makes
sure the pasteboard won't crash us.
- terminate:sender
{
// get a confirmation
if (NXRunAlertPanel ("Quit?","Do you really want to Quit?",NIL,"Cancel",
NIL)) {
// work around 1.0 bug
[[NXApp pasteboard] declareTypes:&NXAsciiPboard num:1 owner:[self class]];
[super terminate:sender]; // do superior's terminate: action
}
return self;
}
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