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Re: IOAudio Drivers & kextload/unload

Hi Tim,

> Other than logging out and unloading the driver (which does unload the
> kext)
> is there a way to force the driver to unload.

It sounds like an application is holding a reference (io_object_t) to
your IgniterAudioEngine instance. When you log out, the application
goes away, and the reference disappears, which allows you to unload the
extension cleanly. If not an application, some entity, in-kernel, or
out-of-kernel.

> I am considering creating a user interface client call that will kill
> the
> instance of the IgniterAudioEngine so that I can successfully unload it
> with
> kextunload, but was wondering if there was an easier way.

The retain mechanism is there to protect us from dangling references.
Circumventing it would be bad. Try to find the entity that is holding a
retain on your object hostage, and the unload problem should go away.

Dan

On Wednesday, February 13, 2002, at 02:54 PM, Timothy McMahon wrote:

> Hello,
>
> I would like to take advantage of the dynamic loading/unloading
> capabilities
> of OS X, but am getting the following error message when trying to
> unload my
> audio driver (which is based off of the SamplePCIAudioDriver example):
>
> Mach_kernel: Can't unload IgniterAudioDriver due to -
> IgniterAudioDriver:
> IgniterAudioEngine has 1 instance(s)
>
> Other than logging out and unloading the driver (which does unload the
> kext)
> is there a way to force the driver to unload.
>
> I am considering creating a user interface client call that will kill
> the
> instance of the IgniterAudioEngine so that I can successfully unload it
> with
> kextunload, but was wondering if there was an easier way.
>
> Thanks,
>
> Tim
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References: 
 >IOAudio Drivers & kextload/unload (From: Timothy McMahon <email@hidden>)



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