[Varnish] #501: Stats variable to monitor how many threads are actually doing something (n_wrk_busy): busy threads monitoring

[Varnish]

#501: Stats variable to monitor how many threads are actually doing something
(n_wrk_busy): busy threads monitoring
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 Reporter:  stockrt                  |        Owner:  phk
     Type:  enhancement              |       Status:  new
 Priority:  normal                   |    Milestone:     
Component:  varnishd                 |      Version:  2.0
 Severity:  normal                   |   Resolution:     
 Keywords:  busy threads monitoring  |  
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Comment (by phk):

 The reason we do not have that variable presently, is that it will quite
 soon become useless if it is not properly locked.

 Properly locking it is not trivial.

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Ticket URL: <http://varnish.projects.linpro.no/ticket/501#comment:2>
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