diff --git a/artiq/frontend/artiq_master.py b/artiq/frontend/artiq_master.py
index e38dfc8ec..2b37717e2 100755
--- a/artiq/frontend/artiq_master.py
+++ b/artiq/frontend/artiq_master.py
@@ -51,13 +51,18 @@ def main():
 
     def run_cb(rid, run_params):
         rtr.current_group = run_params["rtr_group"]
-    scheduler = Scheduler({
+    scheduler = Scheduler(run_cb)
+    scheduler.worker.handlers = {
         "req_device": ddb.request,
         "req_parameter": pdb.request,
         "set_parameter": pdb.set,
         "init_rt_results": rtr.init,
-        "update_rt_results": rtr.update
-    }, run_cb)
+        "update_rt_results": rtr.update,
+        "scheduler_run_queued": scheduler.run_queued,
+        "scheduler_cancel_queued": scheduler.cancel_queued,
+        "scheduler_run_timed": scheduler.run_timed,
+        "scheduler_cancel_timed": scheduler.cancel_timed,
+    }
     loop.run_until_complete(scheduler.start())
     atexit.register(lambda: loop.run_until_complete(scheduler.stop()))
 
diff --git a/artiq/master/scheduler.py b/artiq/master/scheduler.py
index e05af2e3a..8698bcc6a 100644
--- a/artiq/master/scheduler.py
+++ b/artiq/master/scheduler.py
@@ -6,9 +6,9 @@ from artiq.master.worker import Worker
 
 
 class Scheduler:
-    def __init__(self, worker_handlers, run_cb):
+    def __init__(self, run_cb):
         self.run_cb = run_cb
-        self.worker = Worker(worker_handlers)
+        self.worker = Worker()
         self.next_rid = 0
         self.queue = Notifier([])
         self.queue_modified = asyncio.Event()
diff --git a/artiq/master/worker.py b/artiq/master/worker.py
index 168c11050..63d2a4201 100644
--- a/artiq/master/worker.py
+++ b/artiq/master/worker.py
@@ -16,9 +16,9 @@ class RunFailed(Exception):
 
 
 class Worker:
-    def __init__(self, handlers,
+    def __init__(self,
                  send_timeout=0.5, start_reply_timeout=1.0, term_timeout=1.0):
-        self.handlers = handlers
+        self.handlers = dict()
         self.send_timeout = send_timeout
         self.start_reply_timeout = start_reply_timeout
         self.term_timeout = term_timeout
diff --git a/artiq/master/worker_impl.py b/artiq/master/worker_impl.py
index 1d7ac5889..592e089ad 100644
--- a/artiq/master/worker_impl.py
+++ b/artiq/master/worker_impl.py
@@ -58,6 +58,15 @@ def publish_rt_results(notifier, data):
     update_rt_results(data)
 
 
+class Scheduler:
+    run_queued = make_parent_action("scheduler_run_queued",
+                                    "run_params timeout")
+    cancel_queued = make_parent_action("scheduler_cancel_queued", "rid")
+    run_timed = make_parent_action("scheduler_run_timed",
+                                   "run_params timeout next_run")
+    cancel_timed = make_parent_action("scheduler_cancel_timed", "trid")
+
+
 def get_unit(file, unit):
     module = file_import(file)
     if unit is None:
@@ -92,7 +101,7 @@ def run(obj):
     dbh = DBHub(ParentDDB, ParentPDB, rdb)
     try:
         try:
-            unit_inst = unit(dbh, **obj["arguments"])
+            unit_inst = unit(dbh, scheduler=Scheduler, **obj["arguments"])
             unit_inst.run()
             if hasattr(unit_inst, "analyze"):
                 unit_inst.analyze()