Github user mike-jumper commented on a diff in the pull request:
https://github.com/apache/incubator-guacamole-server/pull/39#discussion_r97639500
--- Diff: src/libguac/client.c ---
@@ -544,12 +273,12 @@ int guac_client_add_user(guac_client* client,
guac_user* user, int argc, char**
int retval = 0;
- pthread_rwlock_wrlock(&(client->__users_lock));
-
/* Call handler, if defined */
if (client->join_handler)
retval = client->join_handler(user, argc, argv);
+ pthread_rwlock_wrlock(&(client->__users_lock));
--- End diff --
So that implementations of the `join_handler` and the `leave_handler` need
not be aware of the internals of `guac_client` (that the `guac_client` will
internally acquire a lock on the user list, preventing use of any broadcast
socket).
Prior to this, writing to a broadcast socket within join/leave lead to
undefined results (most likely a segfault). Now, writing to the broadcast
socket within join/leave sends data to all users except the one joining/leaving.
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