Merged revisions 292866 via svnmerge from

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

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  r292866 | dvossel | 2010-10-25 14:05:07 -0500 (Mon, 25 Oct 2010) | 27 lines
  
  This patch turns chan_local pvts into astobj2 objects.
  
  chan_local does some dangerous things involving deadlock avoidance.
  tech_pvt functions like hangup and queue_frame are provided with a
  locked channel upon entry.  Those functions are completely safe as
  long as you don't attempt to give up that channel lock, but that is
  impossible to guarantee due to the required deadlock avoidance necessary
  to lock both the tech_pvt and both channels involved.
  
  In the past, we have tried to account for this by doing things like
  setting a "glare" flag that indicates what function should destroy the
  pvt.  This was used in local_hangup and local_queue_frame to decided
  who should destroy the pvt if they collided in separate threads.  I
  have removed the need to do this by converting all chan_local tech_pvts
  to astobj2.  This means we can ref a pvt before deadlock avoidance
  and not have to worry about that pvt possibly getting destroyed under
  us.  It also cleans up where we destroy the tech_pvt.  The only unlink
  from the tech_pvt container occurs in local_hangup now, which is where
  it should occur.
  
  Since there still may be thread collisions on some functions like
  local_hangup after deadlock avoidance, I have added some checks to detect
  those collisions and exit appropriately.  I think this patch is going to
  solve quite a bit of weirdness we have had with local channels in the past.
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git-svn-id: http://svn.digium.com/svn/asterisk/branches/1.6.2@292867 f38db490-d61c-443f-a65b-d21fe96a405b

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