reintroduce global-wait

doc/global-wait.md

@@ -0,0 +1,40 @@
+Wait for global functions and modules
+=====================================
+
+[◀ Go back to main README](../README.md)
+
+🛈 This script can not be used on its own but requires the base installation.
+See [main README](../README.md) for details.
+
+Description
+-----------
+
+The global functions from `global-functions` and modules are loaded by
+scheduler at system startup. Running these functions at system startup may
+result in race condition where configuration and/or function are not yet
+available. This script is supposed to wait for everything being prepared.
+
+Do **not** add this script `global-wait` to the `global-scripts` scheduler!
+It would inhibit the initialization of configuration and functions.
+
+Requirements and installation
+-----------------------------
+
+Just install the script:
+
+    $ScriptInstallUpdate global-wait;
+
+... and add it to your scheduler, for example in combination with the module
+to [manage VLANs on bridge ports](mod/bridge-port-vlan.md):
+
+    / system scheduler add name=bridge-port-vlan on-event="/ system script run global-wait; :global BridgePortVlan; \$BridgePortVlan default;" start-time=startup;
+
+See also
+--------
+
+* [Manage ports in bridge](mod/bridge-port-to.md)
+* [Manage VLANs on bridge ports](mod/bridge-port-vlan.md)
+
+---
+[◀ Go back to main README](../README.md)  
+[▲ Go back to top](#top)