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From Joe Orton <jor...@redhat.com>
Subject Re: svn commit: r467655 - in /httpd/httpd/trunk: CHANGES docs/manual/mod/mod_cache.xml modules/cache/mod_cache.c modules/cache/mod_cache.h
Date Thu, 26 Oct 2006 12:44:22 GMT
On Thu, Oct 26, 2006 at 11:02:40AM +0200, Graham Leggett wrote:
> On Thu, October 26, 2006 10:50 am, Joe Orton wrote:
> 
> > I'm not sure how that is relevant.  The core output filter writes to the
> > socket directly - it can use non-blocking writes or whatever it likes to
> > do that.  The cache must write to the output filter chain.  How do you
> > propose to do non-blocking writes up the output filter chain?
> 
> The cache by design sits as close to the output filter as humanly
> possible. This means that cache can pass file buckets to the output
> filter, and it does. If ap_core_output_filter() is asked to write a file
> bucket to the network, and this would block, it instead sets aside the
> file bucket in a temporary brigade for sending later, and returns
> immediately.

This is a non-starter.  The cache cannot rely on any particular 
implementation detail of the trunk core output filter (which sounds like 
a bug), nor can it assume that filters between it and the core output 
filter will pass through FILE buckets intact - think about e.g. SSL.

joe

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