Here's something strange. I have a NSDocument-based GC app whose data
model contains an object that uses a resource. (The resource is
actually exclusive access to a MMC-controlled device, but that's not
really relevant.) The object has a finalize method in which the
resource is released.
This all works most of the time. The object is created (and therefore
acquires its resource) when a new document is being created, or when
an existing document is being opened. When the document window is
closed, everything gets garbage collected, the finalize method is
called, and the resource is released.
However, if I close the document window after using the Save As dialog
(either for the initial save of a new document, or for a save-as of an
existing document), the resource is NOT released, because the finalize
method isn't being called, because there's still a reference to that
object.
Here's what the debugger says about that reference:
(gdb) info gc-roots 0x1225400
Number of roots: 1
Root:
0 Kind: global rc: 0 Address: 0xa03f1214 Symbol: shared.176062
warning: can't find class named `NSToolTipManager' given by ObjC
class object
1 Kind: object rc: 0 Address: 0x01050350 Offset: 0x00000008
Class: NSToolTipManager
warning: can't find class named `a' given by ObjC class object
2 Kind: object rc: 0 Address: 0x0104f320 Offset: 0x00000010
Class: NSCFArray
3 Kind: bytes rc: 0 Address: 0x013d7200 Offset: 0x00000040
warning: can't find class named `NSToolTip' given by ObjC class object
4 Kind: object rc: 0 Address: 0x010f8d30 Offset: 0x00000014
Class: NSToolTip
warning: can't find class named `a' given by ObjC class object
5 Kind: object rc: 0 Address: 0x010f8cd0 Offset: 0x00000030
Class: NSCFDictionary
6 Kind: bytes rc: 0 Address: 0x010f8d20
warning: can't find class named `NSNavBrowserCell' given by ObjC
class object
7 Kind: object rc: 0 Address: 0x01326420 Offset: 0x00000014
Class: NSNavBrowserCell
warning: can't find class named `NSNavMatrix' given by ObjC class
object
8 Kind: object rc: 0 Address: 0x01428d60 Offset: 0x00000030
Class: NSNavMatrix
9 Kind: object rc: 0 Address: 0x01082380 Class: NSSavePanel
ivar: _spAuxiliaryStorage
warning: can't find class named `NSSavePanelAuxiliary' given by ObjC
class object
10 Kind: object rc: 0 Address: 0x010c9540 Offset: 0x00000010
Class: NSSavePanelAuxiliary
11 Kind: object rc: 0 Address: 0x01096e80 Class: BPMDocument
ivar: mutableModel
etc, eventually leading to the object that has the resource.
BPMDocument is the application's NSDocument subclass, and mutableModel
is the document's data model.
This appears to say that the save panel is holding a reference to the
document. Does this make any sense to anyone?
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