Merged revisions 68683 via svnmerge from

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

................
r68683 | file | 2007-06-11 10:33:12 -0400 (Mon, 11 Jun 2007) | 10 lines

Merged revisions 68682 via svnmerge from
https://origsvn.digium.com/svn/asterisk/branches/1.2

........
r68682 | file | 2007-06-11 10:29:58 -0400 (Mon, 11 Jun 2007) | 2 lines

Improve deadlock handling of the channel list. (issue #8376 reported by one47)

........

................

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@68684 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/main/channel.c b/main/channel.c
index 4d329d4c4c93274b06ea48c81571cbf9cad76279..bb2457fff65551a2d4ee8ffd31f613532f6cfabb 100644 (file)
--- a/main/channel.c
+++ b/main/channel.c
@@ -977,19 +977,28 @@ static struct ast_channel *channel_find_locked(const struct ast_channel *prev,
                if (!done) {
                        if (option_debug)
                                ast_log(LOG_DEBUG, "Avoiding %s for channel '%p'\n", msg, c);
+                       if (retries == 9) {
+                               /* We are about to fail due to a deadlock, so report this
+                                * while we still have the list lock.
+                                */
+                               if (option_debug)
+                                       ast_log(LOG_DEBUG, "Failure, could not lock '%p' after %d retries!\n", c, retries);
+                               /* As we have deadlocked, we will skip this channel and
+                                * see if there is another match.
+                                * NOTE: No point doing this for a full-name match,
+                                * as there can be no more matches.
+                                */
+                               if (!(name && !namelen)) {
+                                       prev = c;
+                                       retries = -1;
+                               }
+                       }
                }
                AST_LIST_UNLOCK(&channels);
                if (done)
                        return c;
                usleep(1);      /* give other threads a chance before retrying */
        }
-       /*
-        * c is surely not null, but we don't have the lock so cannot
-        * access c->name
-        */
-       if (option_debug)
-               ast_log(LOG_DEBUG, "Failure, could not lock '%p' after %d retries!\n",
-                       c, retries);
 
        return NULL;
 }