Merged revisions 169867 via svnmerge from

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

........
  r169867 | file | 2009-01-21 19:20:47 -0400 (Wed, 21 Jan 2009) | 4 lines
  
  Read lock the contexts to maintain the locking order when we are notified that the state of a device has changed.
  (closes issue #13839)
  Reported by: mcallist
........


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@169869 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/pbx.c

@@ -3774,6 +3774,8 @@ static int handle_statechange(void *datap)
 {
 	struct ast_hint *hint;
 	struct statechange *sc = datap;
+
+	ast_rdlock_contexts();
 	AST_RWLIST_RDLOCK(&hints);
 
 	AST_RWLIST_TRAVERSE(&hints, hint, list) {
@@ -3812,6 +3814,7 @@ static int handle_statechange(void *datap)
 		hint->laststate = state;	/* record we saw the change */
 	}
 	AST_RWLIST_UNLOCK(&hints);
+	ast_unlock_contexts();
 	ast_free(sc);
 	return 0;
 }