fix(dashboard): re-check hub viewers under lock before starting a pump; document alarm send-timeout tradeoff

2026-10-22 06:32:17 -04:00
parent 2c963b7230
commit bd7abf4e35
2 changed files with 5 additions and 2 deletions
@@ -209,7 +209,10 @@ public sealed class DashboardEventBroadcaster : IDashboardEventBroadcaster, IDas
    {
        lock (_syncRoot)
        {
-            if (_disposed)
+            // Re-check under the lock: the last viewer may have left between the
+            // caller's unlocked check and here, and its release handler (which takes
+            // this lock) would then never see a pump created after it ran.
+            if (_disposed || !_viewerRegistry.HasHubViewers(sessionId))
            {
                return;
            }