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Re: [Leopard] Debugging GC

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Re: [Leopard] Debugging GC

Subject: Re: [Leopard] Debugging GC
From: Bill Bumgarner <email@hidden>
Date: Mon, 29 Oct 2007 08:33:51 -0700

On Oct 29, 2007, at 4:59 AM, Pierre Bernard wrote:

I am currently working on my first GC-enabled application.


Excellent!

When I start the application I get the following console output in Xcode:

HoudahSpot2(20753,0xb0103000) malloc: free_garbage: garbage ptr = 0x105e7c0, has non-zero refcount = 1 HoudahSpot2(20753,0xb0103000) malloc: free_garbage: garbage ptr = 0x10696e0, has non-zero refcount = 1

What can I do about this? How does one debug this?

This means that something somewhere had CFRetain()'d something and not CFRelease()'d it before the collector determined that the something -- the collector is not limited to Objective-C objects -- is garbage eligible for collection. It is generally harmless.

While -retain/-release/-autorelease are no-ops under GC, CFRetain() and CFRelease() are not.

In other words, this is a bug in the Apple supplied frameworks. There is a radar tracking it and it'll be fixed.

b.bum
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