1 files changed, 12 insertions, 1 deletions
diff --git a/docker/complement/conf/start_for_complement.sh b/docker/complement/conf/start_for_complement.sh
index 49d79745b0..af13209c54 100755
--- a/docker/complement/conf/start_for_complement.sh
+++ b/docker/complement/conf/start_for_complement.sh
@@ -6,7 +6,7 @@ set -e
 
 echo "Complement Synapse launcher"
 echo "  Args: $@"
-echo "  Env: SYNAPSE_COMPLEMENT_DATABASE=$SYNAPSE_COMPLEMENT_DATABASE SYNAPSE_COMPLEMENT_USE_WORKERS=$SYNAPSE_COMPLEMENT_USE_WORKERS"
+echo "  Env: SYNAPSE_COMPLEMENT_DATABASE=$SYNAPSE_COMPLEMENT_DATABASE SYNAPSE_COMPLEMENT_USE_WORKERS=$SYNAPSE_COMPLEMENT_USE_WORKERS SYNAPSE_COMPLEMENT_USE_ASYNCIO_REACTOR=$SYNAPSE_COMPLEMENT_USE_ASYNCIO_REACTOR"
 
 function log {
     d=$(date +"%Y-%m-%d %H:%M:%S,%3N")
@@ -76,6 +76,17 @@ else
 fi
 
 
+if [[ -n "$SYNAPSE_COMPLEMENT_USE_ASYNCIO_REACTOR" ]]; then
+  if [[ -n "$SYNAPSE_USE_EXPERIMENTAL_FORKING_LAUNCHER" ]]; then
+    export SYNAPSE_COMPLEMENT_FORKING_LAUNCHER_ASYNC_IO_REACTOR="1"
+  else
+    export SYNAPSE_ASYNC_IO_REACTOR="1"
+  fi
+else
+  export SYNAPSE_ASYNC_IO_REACTOR="0"
+fi
+
+
 # Add Complement's appservice registration directory, if there is one
 # (It can be absent when there are no application services in this test!)
 if [ -d /complement/appservice ]; then