Merged revisions 103120 via svnmerge from

Merged revisions 103120 via svnmerge from
https://origsvn.digium.com/svn/asterisk/branches/1.4

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r103120 | mmichelson | 2008-02-08 12:48:17 -0600 (Fri, 08 Feb 2008) | 10 lines

Prevent a potential three-thread deadlock. Also added a comment block
to explicitly state the locking order necessary inside app_queue.

(closes issue #11862)
Reported by: flujan
Patches:
      11862.patch uploaded by putnopvut (license 60)
	  Tested by: flujan

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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@103121 65c4cc65-6c06-0410-ace0-fbb531ad65f3