Merged revisions 104841 via svnmerge from

Merged revisions 104841 via svnmerge from
https://origsvn.digium.com/svn/asterisk/branches/1.4

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r104841 | mmichelson | 2008-02-27 15:49:20 -0600 (Wed, 27 Feb 2008) | 17 lines

Two fixes:

1. Make the list of ast_dial_channels a lockable list. This is because in some cases,
   the ast_dial may exist in multiple threads due to asynchronous execution of its application, and
   I found some cases where race conditions could exist.

2. Check in ast_dial_join to be sure that the channel still exists before attempting to lock it, since
   it could have gotten hung up but the is_running_app flag on the ast_dial_channel may not have been
   cleared yet.

(closes issue #12038)
Reported by: jvandal
Patches:
      12038v2.patch uploaded by putnopvut (license 60)
Tested by: jvandal

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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@105060 65c4cc65-6c06-0410-ace0-fbb531ad65f3