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Julian Elischer
*nix forums Guru Wannabe
Joined: 20 Mar 2002
Posts: 279
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 Posted: Thu Mar 28, 2002 10:14 pm Post subject:
Re: SMP safe reference counting
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On Thu, 28 Mar 2002, Bosko Milekic wrote:
| Quote: |
On Thu, Mar 28, 2002 at 09:45:02AM -0500, John Baldwin wrote:
On 28-Mar-2002 Bosko Milekic wrote:
I don't think we really need a ref. count API, per-se. I can think of
several places that may need to do ref. counting but wouldn't want to
do it with a bus-locked instruction because their reference counter(s)
are already protected by an existing mutex.
-Bosko
Those places wouldn't use the API then I think. However, this would be good
for things like ucreds, pargs, uidinfos and others.
Yeah, absolutely. I was just pointing out that there's little point
in having a reference counting API when a lot of the reference counting
implementations won't be using it.
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but a lot would.. and that's GOOD.
John, can you put your sugfgested API up again?
I remember it would work but was (in my mind) 'different'.
I didn't think it was intuative but at least get it up for discussion..
(I posted my suggested API a few mails ago.. I'm sure it too has
weaknesses though)
Julian
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John Baldwin
*nix forums Guru Wannabe
Joined: 27 Mar 2002
Posts: 278
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| Posted: Thu Mar 28, 2002 10:37 pm Post subject:
Re: SMP safe reference counting
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On 28-Mar-2002 Julian Elischer wrote:
| Quote: |
On Thu, 28 Mar 2002, Bosko Milekic wrote:
On Thu, Mar 28, 2002 at 09:45:02AM -0500, John Baldwin wrote:
On 28-Mar-2002 Bosko Milekic wrote:
I don't think we really need a ref. count API, per-se. I can think of
several places that may need to do ref. counting but wouldn't want to
do it with a bus-locked instruction because their reference counter(s)
are already protected by an existing mutex.
-Bosko
Those places wouldn't use the API then I think. However, this would be
good
for things like ucreds, pargs, uidinfos and others.
Yeah, absolutely. I was just pointing out that there's little point
in having a reference counting API when a lot of the reference counting
implementations won't be using it.
but a lot would.. and that's GOOD.
John, can you put your sugfgested API up again?
I remember it would work but was (in my mind) 'different'.
I didn't think it was intuative but at least get it up for discussion..
(I posted my suggested API a few mails ago.. I'm sure it too has
weaknesses though)
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It's old but it's been at ~jhb/paches/refcount.patch for about an eternity
right now. The changes I would make to it are that I would change
refcount_drop() (or release or whatever it is called) to return the current
value rather than a boolean about the value being 0 or not. Also, once
atomic_fetchadd() is done, it will change a fair bit. There would just be
a MI header, no MD stuff, and we woudln't use a mutex for the debug version
that uses asserts.
--
John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve!" - http://www.FreeBSD.org/
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Julian Elischer
*nix forums Guru Wannabe
Joined: 20 Mar 2002
Posts: 279
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| Posted: Thu Mar 28, 2002 10:45 pm Post subject:
Re: SMP safe reference counting
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On Thu, 28 Mar 2002, John Baldwin wrote:
oops I see it's there.. you just mispelled the path..
sorry
| Quote: |
It's old but it's been at ~jhb/paches/refcount.patch for about an eternity
right now. The changes I would make to it are that I would change
refcount_drop() (or release or whatever it is called) to return the current
value rather than a boolean about the value being 0 or not. Also, once
atomic_fetchadd() is done, it will change a fair bit. There would just be
a MI header, no MD stuff, and we woudln't use a mutex for the debug version
that uses asserts.
Julian
--
John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve!" - http://www.FreeBSD.org/
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