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GUACAMOLE-1293: Do not re-acquire __users_lock while already held for writing.

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Per POSIX spec, the behavior of acquiring a read lock on a rwlock that's
already acquired for writing is undefined. From the documentation for
pthread_rwlock_rdlock():

"... Results are undefined if the calling thread holds a write lock on
rwlock at the time the call is made."
This commit is contained in:
Mike Jumper 2022-11-28 13:37:39 -08:00
parent 07acce8a76
commit e3adb97085
1 changed files with 8 additions and 8 deletions
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16
src/libguac/client.c
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@ -302,15 +302,15 @@ int guac_client_add_user(guac_client* client, guac_user* user, int argc, char**
/* Update owner pointer if user is owner */ /* Update owner pointer if user is owner */
if (user->owner) if (user->owner)
client->__owner = user; client->__owner = user;
/* Notify owner of user joining connection. */
else
guac_client_owner_notify_join(client, user);
} }
pthread_rwlock_unlock(&(client->__users_lock)); pthread_rwlock_unlock(&(client->__users_lock));
/* Notify owner of user joining connection. */
if (retval == 0 && !user->owner)
guac_client_owner_notify_join(client, user);
return retval; return retval;
} }
@ -335,12 +335,12 @@ void guac_client_remove_user(guac_client* client, guac_user* user) {
if (user->owner) if (user->owner)
client->__owner = NULL; client->__owner = NULL;
/* Update owner of user having left the connection. */
else
guac_client_owner_notify_leave(client, user);
pthread_rwlock_unlock(&(client->__users_lock)); pthread_rwlock_unlock(&(client->__users_lock));
/* Update owner of user having left the connection. */
if (!user->owner)
guac_client_owner_notify_leave(client, user);
/* Call handler, if defined */ /* Call handler, if defined */
if (user->leave_handler) if (user->leave_handler)
user->leave_handler(user); user->leave_handler(user);