Merged revisions 185031 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.4

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  r185031 | mmichelson | 2009-03-30 11:17:35 -0500 (Mon, 30 Mar 2009) | 39 lines
  
  Fix queue weight behavior so that calls in low-weight queues are not inappropriately blocked.
  
  (This is copied and pasted from the review request I made for this patch)
  
  Asterisk has some odd behavior when queue weights are used. The current logic used when
  potentially calling a queue member is:
  
  If the member we are going to call is part of another queue and _that other queue has any 
  callers in it_ and has a higher weight than the queue we are calling from, then don't try 
  to contact that member. The issue here is what I have marked with underscores. If the 
  higher-weighted queue has any callers in it at all, then the queue member will be unreachable 
  from the lower-weighted queue. This has the potential to be really really bad if using a 
  queue strategy, such as leastrecent or fewestcalls, with the potential to call the same 
  member repeatedly.
  
  The fix proposed by garychen on issue 13220 is very simple and, as far as I can see, works 
  well for this situation. With this set of changes, the logic used becomes:
  
  If the member we are going to call is part of another queue, the other queue has a higher 
  weight than the queue we are calling from, and the higher weight queue has at least as many 
  callers as available members, then do not try to contact the queue member. If the higher 
  weighted queue has fewer callers than available members, then there is no reason to deny 
  the call to this member since the other queue can afford to spare a member.
  
  Since the fix involved writing a generic function for determining the number of available 
  members in the queue, I also modified the is_our_turn function to make use of the new 
  num_available_members function to determine if it is our turn to try calling a member. There 
  is one small behavior change. Before writing this patch, if you had autofill disabled, then 
  if you were the head caller in a queue, you would automatically be told that it was your 
  turn to try calling a member. This did not take into account whether there were actually any 
  queue members available to take the call. Now we actually make sure there is at least one 
  member available to take the call if autofill is disabled.
  
  (closes issue #13220)
  Reported by: garychen
  
  Review: http://reviewboard.digium.com/r/202/
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