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From Nick Kew <n...@webthing.com>
Subject Re: Fwd: APR resolver?
Date Thu, 30 Mar 2006 00:37:18 GMT
On Thursday 30 March 2006 00:43, Rian A Hunter wrote:

> For my purposes I need a synchronous resolver since I create a thread
> anyway, and the work I plan to do isn't high-priority.

Heh.  Async mail; I wouldn't have posted my last message if this
one had reached me :-)

Of course, what I was referring to was not fully async but
rather simple nonblocking resolution and an EAGAIN return status.

> * You give the API a callback and expect it to call your callback with 
> the query
> data on a separate thread. (this assumes threads)

Hmmm.  I wonder what introducing separate threads here might
reveal?  That use of threads would seem to be incompatible with,
for example, a Tcl interpreter, since that is documented as being
unsafe to use willy-nilly in multiple threads.

> * The API works in some other process abstraction (through a process, 
> or thread
> or mystery) and when processing in your thread absolutely needs the query 
> you do ask the API if it's done yet.

I like that better.  You're keeping any threading issues hidden in
the APR calls, so the applications layer stays simple.

> * Your idea here

Whatever you do, I think it should have simpleminded versions
for plain blocking calls or nonblocking with EAGAIN.

Nick Kew

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