With Windows event the first two periodic frames are sent back without delay (#1590)

When the ThreadBasedCyclicSendTask thread starts, the timer event was already set before entering the first loop. This resulted in the first timer wait to not wait.

Author: pierreluctg

can/broadcastmanager.py

@@ -293,6 +293,10 @@ def _run(self) -> None:
         msg_index = 0
         msg_due_time_ns = time.perf_counter_ns()
 
+        if USE_WINDOWS_EVENTS:
+            # Make sure the timer is non-signaled before entering the loop
+            win32event.WaitForSingleObject(self.event.handle, 0)
+
         while not self.stopped:
             # Prevent calling bus.send from multiple threads
             with self.send_lock: