Merged revisions 280982 via svnmerge from

Merged revisions 280982 via svnmerge from
https://origsvn.digium.com/svn/asterisk/branches/1.4

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  r280982 | tilghman | 2010-08-05 02:28:33 -0500 (Thu, 05 Aug 2010) | 8 lines

  Change context lock back to a mutex, because functionality depends upon the lock being recursive.

  (closes issue #17643)
   Reported by: zerohalo
   Patches:
         20100726__issue17643.diff.txt uploaded by tilghman (license 14)
   Tested by: zerohalo
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git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.6.2@280983 65c4cc65-6c06-0410-ace0-fbb531ad65f3