[Varnish] #227: Abstract the vca_pipes usage for alternative implementations

[Varnish]

#227: Abstract the vca_pipes usage for alternative implementations
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 Reporter:  jesus        |       Owner:  phk  
     Type:  enhancement  |      Status:  new  
 Priority:  normal       |   Milestone:       
Component:  varnishd     |     Version:  trunk
 Severity:  normal       |    Keywords:       
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 The vca_pipes[2] pipe()-based scheduler wake-up system isn't optimal on
 all platforms.   Each acceptor should setup that stuff in init and have a
 private implementation of the actually trigger to pass control back into
 the eventer.

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Ticket URL: <http://varnish.projects.linpro.no/ticket/227>
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