Autoservice loop optimization causes a busy loop, when channels are serviced while in hangup.

(closes issue #17564)
 Reported by: ramonpeek
 Patches: 
       20100630__issue17564.diff.txt uploaded by tilghman (license 14)
 Tested by: ramonpeek


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@273717 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/autoservice.c

@@ -115,6 +115,11 @@ static void *autoservice_run(void *ign)
 		AST_LIST_UNLOCK(&aslist);
 
 		if (!x) {
+			/* If we don't sleep, this becomes a busy loop, which causes
+			 * problems when Asterisk runs at a different priority than other
+			 * user processes.  As long as we check for new channels at least
+			 * once every 10ms, we should be fine. */
+			usleep(10000);
 			continue;
 		}