- move async activation into the server
- implement async queues

diff --git a/server/semaphore.c b/server/semaphore.c
index 022fc73..1ccaeea 100644
--- a/server/semaphore.c
+++ b/server/semaphore.c
@@ -38,6 +38,7 @@
     no_get_fd,                     /* get_fd */
     no_flush,                      /* flush */
     no_get_file_info,              /* get_file_info */
+    NULL,                          /* queue_async */
     no_destroy                     /* destroy */
 };