mxqd: Start jobs without main loop iteration

Try to start as many jobs jobs as possible without going through a main
loop iteration (database roundtrip).

mxqd.c

@@ -2444,15 +2444,20 @@ int main(int argc, char *argv[])
             continue;
         }
 
-        slots_started = start_user_with_least_running_global_slot_count(server);
-        if (slots_started == -1) {
-            mxq_daemon_set_status(server->mysql, daemon, MXQ_DAEMON_STATUS_WAITING);
-            mx_log_info("no slots_started => we have users waiting for free slots");
-            slots_started = 0;
-            poll_interval.tv_sec=3;
-            continue;
-        } else if (slots_started) {
-            mx_log_info("slots_started=%lu :: Main Loop started %lu slots.", slots_started, slots_started);
+        slots_started=0;
+        do {
+            res = start_user_with_least_running_global_slot_count(server);
+            if (res>0) {
+                slots_started+=res;
+           }
+        } while (res>0);
+        if (slots_started)
+            mx_log_info("Main loop started %lu slots.", slots_started);
+        if (res<0) {
+                mx_log_info("No more slots started because we have users waiting for free slots");
+                mxq_daemon_set_status(server->mysql, daemon, MXQ_DAEMON_STATUS_WAITING);
+                poll_interval.tv_sec=3;
+                continue;
         }
 
         if (!slots_started && !slots_returned && !global_sigint_cnt && !global_sigterm_cnt) {