Alexander Viro writes:
>
> On Sat, 24 Jun 2000, Richard Gooch wrote:
>
> > Alan Cox writes:
> > > > explicit module support, I'm wondering what's wrong with simply
> > > > controlling the module count in the module's open()/release()
> > > > functions in these cases?
> > >
> > > By the time you enter the open function it may have been unloaded
> >
> > So unregister driver methods early on in module removal (before code
> > pages are removed) and wait for the module usage counter to hit zero
> > again before returning from the module cleanup function.
>
> Module removal can not start until the counter is zero, what are you
> talking about?
Yeah, forget that. It won't work. But what should work is if rmmod does:
- if refcount != 0, fail
- launch N-1 RT threads which just hog their CPUs
- wait for RT threads to start (use a pipe, say)
- if refcount != 0, kill RT threads and fail
- remove module
- kill RT threads and exit with success.
Regards,
Richard....
Permanent: rgooch@atnf.csiro.au
Current: rgooch@ras.ucalgary.ca
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