Merged revisions 303548 via svnmerge from

https://origsvn.digium.com/svn/asterisk/branches/1.6.2

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  r303548 | russell | 2011-01-24 14:49:53 -0600 (Mon, 24 Jan 2011) | 38 lines
  
  Merged revisions 303546 via svnmerge from 
  https://origsvn.digium.com/svn/asterisk/branches/1.4
  
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    r303546 | russell | 2011-01-24 14:32:21 -0600 (Mon, 24 Jan 2011) | 31 lines
    
    Fix channel redirect out of MeetMe() and other issues with channel softhangup.
    
    Mantis issue #18585 reports that a channel redirect out of MeetMe() stopped
    working properly.  This issue includes a patch that resolves the issue by
    removing a call to ast_check_hangup() from app_meetme.c.  I left that in my
    patch, as it doesn't need to be there.  However, the rest of the patch fixes
    this problem with or without the change to app_meetme.
    
    The key difference between what happens before and after this patch is the
    effect of the END_OF_Q control frame.  After END_OF_Q is hit in ast_read(),
    ast_read() will return NULL.  With the ast_check_hangup() removed, app_meetme
    sees this which causes it to exit as intended.  Checking ast_check_hangup()
    caused app_meetme to exit earlier in the process, and the target of the
    redirect saw the condition where ast_read() returned NULL.
    
    Removing ast_check_hangup() works around the issue in app_meetme, but doesn't
    solve the issue if another application did the same thing.  There are also
    other edge cases where if an application finishes at the same time that a
    redirect happens, the target of the redirect will think that the channel hung
    up.  So, I made some changes in pbx.c to resolve it at a deeper level.  There
    are already places that unset the SOFTHANGUP_ASYNCGOTO flag in an attempt to
    abort the hangup process.  My patch extends this to remove the END_OF_Q frame
    from the channel's read queue, making the "abort hangup" more complete.  This
    same technique was used in every place where a softhangup flag was cleared.
    
    (closes issue #18585)
    Reported by: oej
    Tested by: oej, wedhorn, russell
    
    Review: https://reviewboard.asterisk.org/r/1082/
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git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.8@303549 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_meetme.c

@@ -3070,11 +3070,6 @@ static int conf_run(struct ast_channel *chan, struct ast_conference *conf, struc
 				break;
 			}
 
-			/* Perform an extra hangup check just in case */
-			if (ast_check_hangup(chan)) {
-				break;
-			}
-
 			c = ast_waitfor_nandfds(&chan, 1, &fd, nfds, NULL, &outfd, &ms);
 
 			if (c) {