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From Justin Erenkrantz <jus...@erenkrantz.com>
Subject Re: [PATCH] some progress with apr_socket_data_get()/apr_socket_data_set()
Date Wed, 16 Apr 2003 06:02:42 GMT
--On Tuesday, April 15, 2003 7:39 PM -0400 Jeff Trawick 
<trawick@attglobal.net> wrote:

> You may have known that socket data is implemented as pool userdata in a
> manner that prevented multiple sockets from the same pool being able to use
> the same key for socket data.  Another problem is that any cleanup specified
> in the call to apr_socket_data_set() is run when the pool is cleaned up, not
> when the socket is destroyed (in contradiction to the doc).

Err, yeah, why is it pool_userdata at all?  I'm confused.  Isn't using pool's 
userdata *way* overkill for this?  Can't it just store a void* or something in 
its internal structure?  Why does it have to live longer than the socket 
structure itself?

Are we really wanting to support multiple socket_data instances per socket? 
If a program wants that level, it seems it should just use the 
apr_pool_userdata directly rather than this unnecessary abstraction.  KISS.

> This patch fixes the first problem but not the second.  But before attacking
> the second, I wonder if we really need cleanups on socket data.  If a
> cleanup is really necessary, the application can make use subpools and pool
> cleanups in such a way as to achieve the goal.

Yeah, I think the cleanest thing is to throw-out the cleanups entirely. 
Rework it so it just does get/set of the void* (um, that's overkill - ooh, not 
because apr_socket_t is probably opaque).  The cleanup can be done by whomever 
does the set call.

> Some may even ask why we need socket data, since the application can achieve
> something equivalent by careful use of subpools and pool userdata.

I can buy the use of having a pointer associated with the socket.  It's common 
enough, but yeah, you can do the same with pool_userdata directly.  I'd prefer 
tossing out the key part in apr_socket_data_*, but if you want to be cute and 
backwards-compat, yeah, the hash works as you described.  I just question how 
many apps really need that.  -- justin

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