> [!NotifyQueueControlLock] > <table><tr><td rowspan="4" width="25%"><img src="assets/wl_lwlock_notify_controllock.png"></td><td><b>Wait Category</b></td><td>LWLock</td></tr><tr><td><b>Mechanism</b></td><td><code>NotifyQueueControlLock</code></td></tr><tr><td><b>Operations</b></td><td><a href="Operations/Other/FunctionScan">FunctionScan</a></td></tr><tr><td><b>Resources</b></td><td><a href="Resources/RAM">Memory</a>, <a href="Resources/CPU">CPU</a></td></tr><tr><td colspan="3">Contention on the <b>Notification Registry</b>. This lock coordinates access to the master control structure for the <code>LISTEN/NOTIFY</code> queue, managing global head and tail pointers and coordinating SLRU file creation.</td></tr></table>